/**
 * @file
 * Progressive decoupling: Drupal renders the page shell (nav, auth via
 * session cookie, the "Ajouter une ligne" modal form); this Vue app fetches
 * JSON:API and renders a spreadsheet-like table of every ligne comptable,
 * with filters, month/year grouping, and per-row écart (répartition sum vs
 * montant HT) highlighting -- inconsistencies are shown, not hidden.
 *
 * Sliding window: with 5+ years of migrated history (~1500+ lines), loading
 * everything up front took ~40s and made the tab briefly unresponsive.
 * Instead of one big fetch, `rows` only ever holds a date-range window
 * (initially the ~18 months around today), extended by ~6 months whenever
 * the user scrolls near the top or bottom edge (IntersectionObserver on two
 * sentinel rows), and trimmed from the far end once the window exceeds
 * MAX_LOADED_MONTHS so it stays a genuine sliding buffer, not an
 * ever-growing list. The "Année" filter and the totals footer can't be
 * computed from a partial window, so they're backed by their own small
 * server endpoints (LedgerStatsController) instead.
 */
(function (Drupal, Vue, jQuery) {
  'use strict';

  const API_BASE = '/jsonapi/node/ligne_comptable';
  const EUR = new Intl.NumberFormat('fr-FR', { style: 'currency', currency: 'EUR' });
  const MONTHS = ['Janvier', 'Février', 'Mars', 'Avril', 'Mai', 'Juin', 'Juillet', 'Août', 'Septembre', 'Octobre', 'Novembre', 'Décembre'];
  const TYPE_LABELS = {
    entree: 'Entrée client',
    charge: 'Charge structurelle',
    versement: 'Versement freelance',
    achat: 'Achat client',
    hebergement: 'Hébergement',
    sous_traitant: 'Sous-traitant',
    salaire_stage: 'Salaire / stage',
    charges_local_pro: 'Charges local pro',
    autre: 'Autre',
    ouverture: 'Ouverture',
  };
  // Sorties that can be linked to the entrée client they pay out against
  // (field_entree_liee) -- charge/autre/ouverture/salaire_stage/
  // charges_local_pro aren't client-specific.
  const LINKABLE_TYPES = ['versement', 'achat', 'hebergement', 'sous_traitant'];

  const WINDOW_MONTHS = 9; // each side of "today", for the initial load
  const EXTEND_MONTHS = 6; // increment per scroll-triggered load
  const MAX_LOADED_MONTHS = 30; // trim the far end once the window exceeds this
  // While a thinning filter (compte/client/type/écarts) is active, the cap
  // above is actively counter-productive: extending one end and trimming
  // the other nets out to roughly the same 30-month slice every round
  // (see ensureScrollable()), so a filter with only a handful of matches
  // per year can search almost forever without ever surfacing more of
  // them. Comfortably wider than the whole migrated dataset (2021-today)
  // so a filter effectively gets the entire history to search, still
  // bounded (not literally unbounded memory) -- and DOM rendering cost
  // stays proportional to filteredRows, not this raw fetched count.
  const MAX_LOADED_MONTHS_FILTERED = 96;
  // Hard cap on ensureScrollable()'s recursion (see below) -- comfortably
  // more than enough rounds to walk the entire MIN_LOADABLE_DATE..
  // MAX_LOADABLE_DATE span at EXTEND_MONTHS per round.
  const MAX_ENSURE_SCROLLABLE_ROUNDS = 30;

  // Absolute bounds on how far the window can extend. Without these,
  // loadOlder()/loadNewer() kept pushing windowStart/windowEnd outward
  // even when a fetch came back empty (e.g. extending into future dates
  // with no data yet) -- since nothing about the table's height or
  // scroll position changes when 0 rows come back, checkEdges() stayed
  // satisfied and the next scroll/layout tick fired the exact same load
  // again, drifting further out forever with no way to stop. Comfortably
  // before the earliest migrated year (2021) and well past any plausible
  // future-dated entry.
  const MIN_LOADABLE_DATE = '2020-06-01';
  const MAX_LOADABLE_DATE = addMonths(todayStr(), 24);

  function todayStr() {
    return new Date().toISOString().slice(0, 10);
  }

  function addMonths(dateStr, n) {
    const d = new Date(dateStr + 'T00:00:00');
    d.setMonth(d.getMonth() + n);
    return d.toISOString().slice(0, 10);
  }

  function monthsBetween(a, b) {
    const da = new Date(a + 'T00:00:00');
    const db = new Date(b + 'T00:00:00');
    return (db.getFullYear() - da.getFullYear()) * 12 + (db.getMonth() - da.getMonth());
  }

  // Builds the JSON:API URL for a half-open date range [start, end).
  function rangeUrl(start, end) {
    const filter =
      'filter[dateRange][group][conjunction]=AND' +
      '&filter[gte][condition][path]=field_date_ligne' +
      '&filter[gte][condition][operator]=%3E%3D' +
      '&filter[gte][condition][value]=' + start +
      '&filter[gte][condition][memberOf]=dateRange' +
      '&filter[lt][condition][path]=field_date_ligne' +
      '&filter[lt][condition][operator]=%3C' +
      '&filter[lt][condition][value]=' + end +
      '&filter[lt][condition][memberOf]=dateRange';
    return API_BASE + '?include=field_repartition,field_repartition.field_compte,field_client,field_entree_liee'
      + '&page[limit]=50&sort=field_date_ligne,drupal_internal__nid&' + filter;
  }

  async function fetchLignes(url) {
    // sort includes drupal_internal__nid as a tie-breaker: field_date_ligne
    // alone is not unique (many lines share a date), and without a unique
    // secondary sort key, offset pagination can silently duplicate or skip
    // rows across pages.
    const allData = [];
    const includedMap = new Map();
    while (url) {
      const res = await fetch(url, { headers: { Accept: 'application/vnd.api+json' } });
      if (!res.ok) throw new Error('JSON:API a répondu ' + res.status);
      const json = await res.json();
      allData.push(...(json.data || []));
      (json.included || []).forEach((item) => includedMap.set(item.type + ':' + item.id, item));
      url = json.links && json.links.next ? json.links.next.href : null;
    }
    // Defensive de-dup by node id, in case pagination ever repeats a row.
    const seen = new Set();
    const dedup = allData.filter((n) => (seen.has(n.id) ? false : (seen.add(n.id), true)));
    return { data: dedup, includedMap };
  }

  async function fetchClientNames() {
    const res = await fetch('/jsonapi/taxonomy_term/client?sort=name&page[limit]=200', { headers: { Accept: 'application/vnd.api+json' } });
    if (!res.ok) throw new Error('JSON:API a répondu ' + res.status);
    const json = await res.json();
    return (json.data || []).map((t) => t.attributes.name).filter(Boolean).sort();
  }

  async function fetchYearsList() {
    const res = await fetch('/lignes/api/annees', { headers: { Accept: 'application/json' } });
    if (!res.ok) throw new Error('/lignes/api/annees a répondu ' + res.status);
    const json = await res.json();
    return json.annees || [];
  }

  // { "2023": { "Bachir": -0.03, ... }, ... } -- years where the actual
  // ouverture doesn't match the previous year's calculated closing
  // balance (that year's own ouverture + every movement dated within
  // it). Small dataset (a handful of year boundaries), fetched once.
  async function fetchOuvertureEcarts() {
    const res = await fetch('/lignes/api/reconciliation-ouverture', { headers: { Accept: 'application/json' } });
    if (!res.ok) throw new Error('/lignes/api/reconciliation-ouverture a répondu ' + res.status);
    return res.json();
  }

  // POST /lignes/{nid}/type -- change field_type_ligne without opening the
  // full edit form. Fetches a fresh CSRF token each time (core's
  // /session/token) rather than caching one -- this is an occasional
  // action, not worth the complexity of handling a stale cached token.
  async function updateLigneType(nid, type) {
    const tokenRes = await fetch('/session/token');
    const token = await tokenRes.text();
    const res = await fetch('/lignes/' + nid + '/type', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', 'X-CSRF-Token': token },
      body: JSON.stringify({ type }),
    });
    const json = await res.json().catch(() => ({}));
    if (!res.ok) throw new Error(json.error || ('/lignes/' + nid + '/type a répondu ' + res.status));
    return json;
  }

  async function fetchYearTotals(annee) {
    const res = await fetch('/lignes/api/totaux?annee=' + encodeURIComponent(annee), { headers: { Accept: 'application/json' } });
    if (!res.ok) throw new Error('/lignes/api/totaux a répondu ' + res.status);
    return res.json();
  }

  // URL hash (#compte=Maud&type=versement&annee=2023&ecarts=1&aller=2024)
  // makes the filters and "Aller à" shareable/reloadable -- reload the
  // page or send the link and you land back in the same filtered view.
  // "aller" isn't an ongoing filter (jumpYearValue itself always resets
  // to '' right after firing) but its target year is worth remembering
  // for this purpose, so it's tracked separately (lastJumpYear) purely
  // for the hash. Not included: groupBy, filterEntreeId -- out of scope
  // of what was asked (the toolbar filters + "Aller à").
  function readHashState() {
    const params = new URLSearchParams(location.hash.replace(/^#/, ''));
    return {
      filterCompte: params.get('compte') || '',
      filterClient: params.get('client') || '',
      filterType: params.get('type') || '',
      filterYear: params.get('annee') || '',
      onlyErrors: params.get('ecarts') === '1',
      aller: params.get('aller') || '',
    };
  }

  function buildHashString(state) {
    const params = new URLSearchParams();
    if (state.filterCompte) params.set('compte', state.filterCompte);
    if (state.filterClient) params.set('client', state.filterClient);
    if (state.filterType) params.set('type', state.filterType);
    if (state.filterYear) params.set('annee', state.filterYear);
    if (state.onlyErrors) params.set('ecarts', '1');
    // Redundant/ambiguous alongside an active "Année" filter -- that
    // already fully describes the year, so don't also carry a stale
    // "aller" target into the hash.
    if (state.lastJumpYear && !state.filterYear) params.set('aller', state.lastJumpYear);
    return params.toString();
  }

  function resolve(includedMap, ref) {
    if (!ref) return null;
    return includedMap.get(ref.type + ':' + ref.id) || null;
  }

  function buildRows(data, includedMap) {
    const rows = [];
    for (const node of data) {
      const rels = node.relationships || {};
      const attrs = node.attributes;
      const clientTerm = resolve(includedMap, rels.field_client && rels.field_client.data);
      // field_entree_liee is multi-value (a single payment sometimes
      // covers several client invoices at once) -- JSON:API always
      // returns an array for a multi-cardinality relationship, one ref
      // per linked entrée, even when there's only one or none.
      const entreeLieeRefs = (rels.field_entree_liee && rels.field_entree_liee.data) || [];
      const entreeLieeNodes = entreeLieeRefs.map((ref) => resolve(includedMap, ref)).filter(Boolean);
      const parCompte = {};
      let somme = 0;
      const repartitionRefs = (rels.field_repartition && rels.field_repartition.data) || [];
      for (const ref of repartitionRefs) {
        const paragraph = resolve(includedMap, ref);
        if (!paragraph) continue;
        const montant = parseFloat(paragraph.attributes.field_montant || 0);
        const compteTerm = resolve(includedMap, paragraph.relationships && paragraph.relationships.field_compte && paragraph.relationships.field_compte.data);
        const compteName = compteTerm ? compteTerm.attributes.name : '(compte inconnu)';
        parCompte[compteName] = (parCompte[compteName] || 0) + montant;
        somme += montant;
      }
      const montantHt = attrs.field_montant_ht !== null && attrs.field_montant_ht !== undefined ? parseFloat(attrs.field_montant_ht) : null;
      const ecart = montantHt !== null ? Math.round((montantHt - somme) * 100) / 100 : 0;
      rows.push({
        id: node.id,
        nid: attrs.drupal_internal__nid,
        date: attrs.field_date_ligne,
        type: attrs.field_type_ligne,
        client: clientTerm ? clientTerm.attributes.name : null,
        libelle: attrs.field_notes || attrs.title,
        montant_ht: montantHt,
        montant_ttc: attrs.field_montant_ttc !== null && attrs.field_montant_ttc !== undefined ? parseFloat(attrs.field_montant_ttc) : null,
        parCompte,
        somme,
        ecart,
        hasError: Math.abs(ecart) > 0.01,
        linkable: LINKABLE_TYPES.includes(attrs.field_type_ligne),
        entreeLieeIds: entreeLieeNodes.map((n) => n.id),
        entreeLieeLabels: entreeLieeNodes.map((n) => n.attributes.title || n.id),
      });
    }
    rows.sort((a, b) => (a.date || '').localeCompare(b.date || ''));
    return rows;
  }

  const App = {
    data() {
      return {
        loading: true,
        error: null,
        rows: [],
        allComptes: ['Sandrine', 'Maud', 'Ouidade', 'Chloé', 'Bachir', 'Valentin', 'EXT.', 'EXT.WEB'],
        allClientsList: [],
        allYearsList: [],
        ouvertureEcarts: {},
        filterCompte: '',
        filterClient: '',
        filterType: '',
        filterYear: '',
        jumpYearValue: '',
        // Not a filter itself (jumpYearValue always resets to '' right
        // after firing) -- just remembers the last "Aller à" target so
        // the URL hash can reflect it. See syncHash()/readHashState().
        lastJumpYear: '',
        groupBy: 'month',
        onlyErrors: false,
        hoverCol: null,
        filterEntreeId: null,
        // Which row's type badge is currently showing its inline <select>
        // instead of the badge -- only one at a time.
        editingTypeId: null,
        typeUpdateError: null,
        // Fenêtre glissante.
        windowStart: null,
        windowEnd: null,
        loadingOlder: false,
        loadingNewer: false,
        // True while EITHER loadOlder() or loadNewer() is running -- they
        // both mutate `rows`/windowStart/windowEnd, and a scroll-position
        // compensation write inside one (from trimming the far end) fires
        // a real 'scroll' event that can kick off the other direction
        // while the first is still in flight. Without a shared lock, the
        // two interleave and race on the same state -- observed as `rows`
        // transiently emptying out (table blinks away) before settling.
        // loadingOlder/loadingNewer stay separate for the sentinel-row
        // text; this gates actual execution.
        loadingWindow: false,
        // Footer : totaux de l'année actuellement visible à l'écran (pas
        // de la fenêtre chargée), voir detectCurrentYear().
        currentYear: null,
        currentYearTotals: null,
        currentYearLoading: false,
      };
    },
    computed: {
      allTypes() {
        return Object.entries(TYPE_LABELS).map(([value, label]) => ({ value, label }));
      },
      errorCount() {
        return this.rows.filter((r) => r.hasError).length;
      },
      // A sortie linked to several entrées (one payment covering several
      // invoices) appears under each of them here.
      sortiesByEntree() {
        const map = new Map();
        for (const r of this.rows) {
          for (const entreeId of r.entreeLieeIds) {
            if (!map.has(entreeId)) map.set(entreeId, []);
            map.get(entreeId).push(r);
          }
        }
        return map;
      },
      // Compares each entrée's répartition (positive shares owed) against
      // the combined répartition of every sortie linked to it (negative
      // amounts paid out), per compte -- both sides can be split across
      // several comptes. A residual near zero means fully settled;
      // positive means still owed ("reste à verser"); negative means more
      // was paid out than the entrée allocated ("sur-versé", worth a
      // closer look). Precomputed once for all entrée rows rather than
      // recomputed per template read. Limited to the currently loaded
      // window -- a sortie linked to an entrée outside it won't be
      // counted (accepted trade-off of the sliding window).
      //
      // A sortie linked to several entrées at once (one payment covering
      // several invoices) has no record of how much of it applies to
      // each -- there's no per-link amount, just a set of linked entrées.
      // Split its répartition equally between them as the least-wrong
      // assumption available, rather than counting its full amount
      // against every linked entrée (which would double- or triple-count
      // the same money).
      reconciliationByEntree() {
        const map = new Map();
        for (const entreeRow of this.rows) {
          if (entreeRow.type !== 'entree') continue;
          const linked = this.sortiesByEntree.get(entreeRow.id) || [];
          const versementsParCompte = {};
          for (const s of linked) {
            const share = s.entreeLieeIds.length || 1;
            for (const [compte, montant] of Object.entries(s.parCompte)) {
              versementsParCompte[compte] = (versementsParCompte[compte] || 0) + montant / share;
            }
          }
          const comptes = new Set([...Object.keys(entreeRow.parCompte), ...Object.keys(versementsParCompte)]);
          let resteAVerser = 0;
          let surVerse = 0;
          const detail = [];
          // Kept per-compte (not just folded into the two totals above) --
          // versementStatus() below needs to check a single sortie's own
          // compte(s) against the entrée, not the entrée's overall
          // reconciliation, which can span *other* comptes tied to other
          // sorties linked to the same entrée.
          const parCompteResidual = {};
          for (const c of comptes) {
            const residual = Math.round(((entreeRow.parCompte[c] || 0) + (versementsParCompte[c] || 0)) * 100) / 100;
            parCompteResidual[c] = residual;
            if (residual > 0.01) resteAVerser += residual;
            else if (residual < -0.01) surVerse += -residual;
            if (Math.abs(residual) > 0.01) detail.push(c + ' : ' + this.formatEur(residual));
          }
          map.set(entreeRow.id, {
            count: linked.length,
            resteAVerser: Math.round(resteAVerser * 100) / 100,
            surVerse: Math.round(surVerse * 100) / 100,
            detail: detail.join(', ') || 'Entièrement soldé',
            parCompteResidual,
          });
        }
        return map;
      },
      // The full connected group of entrées + sorties reachable from
      // filterEntreeId by following field_entree_liee links transitively.
      // A sortie can now link to several entrées at once (split payment),
      // so drilling into one entrée should also surface every *other*
      // entrée it shares a sortie with, and that entrée's own sorties in
      // turn -- not just the originally-clicked entrée's direct links.
      filterEntreeGroup() {
        if (!this.filterEntreeId) return null;
        const entreeIds = new Set([this.filterEntreeId]);
        let grown = true;
        while (grown) {
          grown = false;
          for (const r of this.rows) {
            if (r.type === 'entree' || !r.entreeLieeIds.some((id) => entreeIds.has(id))) continue;
            for (const id of r.entreeLieeIds) {
              if (!entreeIds.has(id)) {
                entreeIds.add(id);
                grown = true;
              }
            }
          }
        }
        const entrees = this.rows.filter((r) => r.type === 'entree' && entreeIds.has(r.id));
        const sorties = this.rows.filter((r) => r.type !== 'entree' && r.entreeLieeIds.some((id) => entreeIds.has(id)));
        return [...entrees, ...sorties];
      },
      filteredRows() {
        // Drill-down mode: the connected entrée/sortie group, ignoring
        // the other filters -- clicking the badge again clears it.
        if (this.filterEntreeId) {
          return this.filterEntreeGroup;
        }
        return this.rows.filter((r) => {
          if (this.filterCompte && r.parCompte[this.filterCompte] === undefined) return false;
          if (this.filterClient && r.client !== this.filterClient) return false;
          if (this.filterType && r.type !== this.filterType) return false;
          if (this.filterYear && (r.date || '').slice(0, 4) !== this.filterYear) return false;
          if (this.onlyErrors && !r.hasError) return false;
          return true;
        });
      },
      // Footer totals while drilled down into one entrée + its linked
      // sorties (see filteredRows' drill-down branch above): the whole
      // point of this view is "does this entrée balance against what was
      // paid out", so the footer should answer exactly that instead of
      // the current year's totals -- and it can be computed locally
      // (unlike the per-year figures, this handful of rows is already
      // fully loaded), no server round-trip needed. Same shape as
      // /lignes/api/totaux so the template can render either the same
      // way.
      drilldownTotals() {
        if (!this.filterEntreeId) return null;
        let montantHt = 0;
        let montantTtc = 0;
        let ecart = 0;
        const parCompte = {};
        for (const r of this.filteredRows) {
          montantHt += r.montant_ht || 0;
          montantTtc += r.montant_ttc || 0;
          ecart += r.ecart || 0;
          for (const [c, v] of Object.entries(r.parCompte)) {
            parCompte[c] = (parCompte[c] || 0) + v;
          }
        }
        const round = (v) => Math.round(v * 100) / 100;
        return {
          montant_ht: round(montantHt),
          montant_ttc: round(montantTtc),
          ecart: round(ecart),
          par_compte: Object.fromEntries(Object.entries(parCompte).map(([c, v]) => [c, round(v)])),
        };
      },
      // What the footer actually renders -- the drill-down's own totals
      // while active, otherwise the current year's (see
      // detectCurrentYear()/loadCurrentYearTotals()). Switches back
      // automatically the moment filterEntreeId clears.
      footerTotals() {
        return this.filterEntreeId ? this.drilldownTotals : this.currentYearTotals;
      },
      groupedRows() {
        const list = this.filteredRows;
        if (this.groupBy === 'none') return list;
        const groups = new Map();
        for (const r of list) {
          const d = r.date ? new Date(r.date + 'T00:00:00') : null;
          let key, label;
          if (this.groupBy === 'year') {
            key = d ? String(d.getFullYear()) : '?';
            label = key;
          } else {
            key = d ? d.getFullYear() + '-' + String(d.getMonth() + 1).padStart(2, '0') : '?';
            label = d ? MONTHS[d.getMonth()] + ' ' + d.getFullYear() : 'Date inconnue';
          }
          if (!groups.has(key)) groups.set(key, { label, year: d ? String(d.getFullYear()) : null, rows: [] });
          groups.get(key).rows.push(r);
        }
        const sortedKeys = Array.from(groups.keys()).sort();
        const out = [];
        for (const key of sortedKeys) {
          const g = groups.get(key);
          out.push({ isGroup: true, key: 'g-' + key, label: g.label, count: g.rows.length, year: g.year });
          for (const r of g.rows) out.push(Object.assign({ key: 'r-' + r.id }, r));
        }
        return out;
      },
    },
    methods: {
      formatEur(v) {
        return v === null || v === undefined ? '' : EUR.format(v);
      },
      // Écart between this ouverture row's year and the previous year's
      // calculated closing balance -- restricted to whichever compte(s)
      // this specific row's répartition actually touches (ouverture lines
      // are entered one per compte, so showing every compte's écart on
      // every row would just repeat the same list). Null if this row's
      // compte(s) reconcile cleanly.
      ouvertureEcart(item) {
        if (item.type !== 'ouverture' || !item.date) return null;
        const annee = item.date.slice(0, 4);
        const ecarts = this.ouvertureEcarts[annee];
        if (!ecarts) return null;
        const relevant = Object.keys(item.parCompte).filter((c) => ecarts[c] !== undefined);
        if (!relevant.length) return null;
        const detail = relevant.map((compte) => compte + ' : ' + this.formatEur(ecarts[compte])).join(', ');
        return { detail, comptes: relevant.length };
      },
      // Flags a "versement freelance" row that isn't (fully) backed by
      // the entrée client(s) it pays out against: either not linked at
      // all, or linked but its own compte(s) still show a residual
      // against at least one of them. Deliberately scoped to just the
      // compte(s) this versement's own répartition touches
      // (reconciliationByEntree's parCompteResidual), not the entrée's
      // overall resteAVerser/surVerse -- those can be driven entirely by
      // a *different* compte tied to some other sortie linked to the
      // same entrée, which says nothing about whether this versement's
      // own répartition is settled. When linked to several entrées (see
      // reconciliationByEntree's equal-split note), each entrée's
      // residual for these compte(s) counts separately -- they're
      // independent invoices, each with its own outstanding amount.
      // Entrées outside the currently loaded window are skipped (same
      // accepted trade-off as reconciliationByEntree itself); null only
      // if none of them could be checked at all.
      versementStatus(item) {
        if (item.type !== 'versement') return null;
        if (!item.entreeLieeIds.length) {
          return { kind: 'non-liee', detail: 'Aucune entrée client liée.' };
        }
        let resteAVerser = 0;
        let surVerse = 0;
        let checked = 0;
        for (const entreeId of item.entreeLieeIds) {
          const recon = this.reconciliationByEntree.get(entreeId);
          if (!recon) continue;
          checked++;
          for (const c of Object.keys(item.parCompte)) {
            const residual = recon.parCompteResidual[c] || 0;
            if (residual > 0.01) resteAVerser += residual;
            else if (residual < -0.01) surVerse += -residual;
          }
        }
        if (!checked) return null;
        if (resteAVerser > 0.01) {
          return { kind: 'reste', detail: 'Reste à verser (comptes de cette ligne) : ' + this.formatEur(Math.round(resteAVerser * 100) / 100) };
        }
        if (surVerse > 0.01) {
          return { kind: 'sur-verse', detail: 'Sur-versé (comptes de cette ligne) : ' + this.formatEur(Math.round(surVerse * 100) / 100) };
        }
        return null;
      },
      versementStatusLabel(kind) {
        if (kind === 'non-liee') return 'Non liée';
        if (kind === 'reste') return 'Reste à verser';
        return 'Sur-versé';
      },
      // jj/mm/aa -- shorter than the API's ISO yyyy-mm-dd, saves column
      // width in a table already packed with 8 compte columns.
      formatDate(iso) {
        if (!iso) return '';
        const [y, m, d] = iso.split('-');
        return d + '/' + m + '/' + y.slice(2);
      },
      typeLabel(t) {
        return TYPE_LABELS[t] || t;
      },
      soldeClass(v) {
        if (v > 0.5) return 'figli-solde-crediteur';
        if (v < -0.5) return 'figli-solde-debiteur';
        return '';
      },
      // Single colored anchor per row (Montant HT only, not every compte
      // column) so entrées/sorties are scannable at a glance without the
      // table turning into a red/green garland. No 0.5€ threshold like
      // soldeClass -- individual lines are often small (e.g. a -1.07€ OVH
      // renewal), any nonzero sign should read as positive/negative.
      montantClass(v) {
        if (v > 0) return 'figli-montant-positif';
        if (v < 0) return 'figli-montant-negatif';
        return '';
      },
      openAddForm() {
        Drupal.ajax({
          url: '/node/add/ligne_comptable',
          dialogType: 'modal',
          dialog: { width: 800, title: 'Ajouter une ligne comptable' },
          progress: { type: 'throbber' },
        }).execute();
      },
      openEditForm(nid) {
        Drupal.ajax({
          url: '/node/' + nid + '/edit',
          dialogType: 'modal',
          dialog: { width: 800, title: 'Modifier la ligne comptable' },
          progress: { type: 'throbber' },
        }).execute();
      },
      openLinkForm(nid) {
        Drupal.ajax({
          url: '/lignes/' + nid + '/lier',
          dialogType: 'modal',
          dialog: { width: 500, title: 'Lier à une entrée client' },
          progress: { type: 'throbber' },
        }).execute();
      },
      toggleEntreeFilter(id) {
        this.filterEntreeId = this.filterEntreeId === id ? null : id;
      },
      startEditType(item) {
        this.typeUpdateError = null;
        this.editingTypeId = item.id;
      },
      // Optimistically patches the row in `rows` (not the transient
      // `item` from groupedRows -- that object is rebuilt from scratch on
      // every computed re-evaluation, so mutating it wouldn't stick) for
      // instant feedback, then reconciles with the server in the
      // background via reloadWindow() (picks up anything else the save
      // touched, e.g. a cleared field_entree_liee).
      async saveType(item, event) {
        const newType = event.target.value;
        this.editingTypeId = null;
        if (newType === item.type) return;
        try {
          const result = await updateLigneType(item.nid, newType);
          const row = this.rows.find((r) => r.id === item.id);
          if (row) {
            row.type = newType;
            row.linkable = LINKABLE_TYPES.includes(newType);
            if (result.entree_liee_cleared) {
              row.entreeLieeIds = [];
              row.entreeLieeLabels = [];
            }
          }
          this.reloadWindow();
        } catch (err) {
          this.typeUpdateError = err.message;
        }
      },
      onCellHover(evt) {
        const cell = evt.target.closest('td, th');
        if (!cell) return;
        // No crosshair on the technical action columns (link/edit icons) --
        // there's nothing to compare across rows there.
        if (cell.classList.contains('actions-col')) {
          this.clearColHover();
          return;
        }
        // Logical column position, not DOM sibling index: the totals row's
        // first cell has colspan="4", which shifts every cell.cellIndex
        // after it out of alignment with the body rows.
        const index = this.logicalColIndex(cell);
        if (index === this.hoverCol) return;
        this.setColHover(index);
      },
      clearColHover() {
        this.setColHover(null);
      },
      logicalColIndex(cell) {
        let index = 0;
        let sib = cell.previousElementSibling;
        while (sib) {
          index += sib.colSpan || 1;
          sib = sib.previousElementSibling;
        }
        return index;
      },
      // Whole-column highlight (header + body + footer) to pair with the
      // row hover: plain DOM class toggling rather than a Vue-bound class
      // per cell, since the column count/order is fixed markup here, not
      // data-driven -- no need to thread an index through every <td>.
      setColHover(index) {
        const table = this.$refs.tableEl;
        if (!table) return;
        table.querySelectorAll('.figli-col-hover').forEach((el) => el.classList.remove('figli-col-hover'));
        this.hoverCol = index;
        if (index === null) return;
        table.querySelectorAll('tr').forEach((tr) => {
          let pos = 0;
          for (const cell of tr.children) {
            const span = cell.colSpan || 1;
            if (index >= pos && index < pos + span) {
              cell.classList.add('figli-col-hover');
              break;
            }
            pos += span;
          }
        });
      },
      // showLoading defaults to true for the initial mount, where there's
      // nothing on screen yet to preserve. A post-edit refresh passes
      // false: flipping `loading` back to true would unmount the whole
      // v-else table (the "Chargement…" paragraph takes its place) and
      // remount it from scratch once the fetch resolves -- exactly the
      // full-table flicker/scroll-reset Vue's keyed diffing exists to
      // avoid. Reassigning `rows` in place lets Vue patch just the rows
      // that actually changed.
      async load(showLoading = true) {
        if (showLoading) this.loading = true;
        this.error = null;
        try {
          const today = todayStr();
          this.windowStart = addMonths(today, -WINDOW_MONTHS);
          this.windowEnd = addMonths(today, WINDOW_MONTHS);
          const { data, includedMap } = await fetchLignes(rangeUrl(this.windowStart, this.windowEnd));
          this.rows = buildRows(data, includedMap);
        } catch (err) {
          this.error = err.message;
        } finally {
          if (showLoading) this.loading = false;
        }
      },
      // Post-edit refresh: re-fetch exactly the currently loaded window
      // (not a fresh "last 18 months" window) so editing an old line
      // doesn't silently reset how far the user had scrolled back.
      async reloadWindow() {
        if (!this.windowStart || !this.windowEnd) return;
        try {
          const { data, includedMap } = await fetchLignes(rangeUrl(this.windowStart, this.windowEnd));
          this.rows = buildRows(data, includedMap);
        } catch (err) {
          this.error = err.message;
        }
      },
      async loadOlder() {
        // Bypassed while a specific "Année" filter is active -- that mode
        // loads exactly one year and nothing else (see enterYearMode).
        // Also bypassed once the window already reaches MIN_LOADABLE_DATE --
        // nothing older to fetch, so skip straight out instead of re-firing
        // an empty request on every subsequent scroll/layout tick.
        if (this.loadingWindow || !this.windowStart || this.filterYear || this.windowStart <= MIN_LOADABLE_DATE) return;
        this.loadingWindow = true;
        this.loadingOlder = true;
        try {
          let newStart = addMonths(this.windowStart, -EXTEND_MONTHS);
          if (newStart < MIN_LOADABLE_DATE) newStart = MIN_LOADABLE_DATE;
          const { data, includedMap } = await fetchLignes(rangeUrl(newStart, this.windowStart));
          const newRows = buildRows(data, includedMap);
          this.windowStart = newStart;

          if (newRows.length) {
            const wrap = this.$refs.tableWrap;
            const prevScrollHeight = wrap ? wrap.scrollHeight : 0;
            this.rows = [...newRows, ...this.rows];
            await this.$nextTick();
            // Prepending pushes existing content down -- keep whatever
            // the user was looking at in the same visual spot.
            if (wrap) wrap.scrollTop += wrap.scrollHeight - prevScrollHeight;
          }

          // Trim the far (newer) end once the window's grown past the cap
          // -- happens below the current scroll position, so no visual
          // jump to compensate for.
          const maxEnd = addMonths(this.windowStart, this.isFiltering() ? MAX_LOADED_MONTHS_FILTERED : MAX_LOADED_MONTHS);
          if (this.windowEnd > maxEnd) {
            this.rows = this.rows.filter((r) => r.date < maxEnd);
            this.windowEnd = maxEnd;
          }
        } catch (err) {
          this.error = err.message;
        } finally {
          this.loadingOlder = false;
          this.loadingWindow = false;
        }
      },
      async loadNewer() {
        // Same MIN_LOADABLE_DATE reasoning as loadOlder(), mirrored at the
        // future end.
        if (this.loadingWindow || !this.windowEnd || this.filterYear || this.windowEnd >= MAX_LOADABLE_DATE) return;
        this.loadingWindow = true;
        this.loadingNewer = true;
        try {
          let newEnd = addMonths(this.windowEnd, EXTEND_MONTHS);
          if (newEnd > MAX_LOADABLE_DATE) newEnd = MAX_LOADABLE_DATE;
          const { data, includedMap } = await fetchLignes(rangeUrl(this.windowEnd, newEnd));
          const newRows = buildRows(data, includedMap);
          this.windowEnd = newEnd;

          if (newRows.length) {
            // Appended below the viewport -- no scroll compensation needed.
            this.rows = [...this.rows, ...newRows];
          }

          // Trim the far (older) end once past the cap -- this IS above
          // the viewport, so compensate scrollTop the same way loadOlder
          // does for its prepend.
          const minStart = addMonths(this.windowEnd, this.isFiltering() ? -MAX_LOADED_MONTHS_FILTERED : -MAX_LOADED_MONTHS);
          if (this.windowStart < minStart) {
            const wrap = this.$refs.tableWrap;
            const prevScrollHeight = wrap ? wrap.scrollHeight : 0;
            const prevScrollTop = wrap ? wrap.scrollTop : 0;
            this.rows = this.rows.filter((r) => r.date >= minStart);
            this.windowStart = minStart;
            await this.$nextTick();
            if (wrap) wrap.scrollTop = prevScrollTop - (prevScrollHeight - wrap.scrollHeight);
          }
        } catch (err) {
          this.error = err.message;
        } finally {
          this.loadingNewer = false;
          this.loadingWindow = false;
        }
      },
      // Scroll-position based rather than IntersectionObserver: one
      // unified scroll handler drives both edge-loading and
      // detectCurrentYear() below, instead of maintaining two separate
      // observer instances for what's fundamentally the same "where is
      // the user looking right now" question.
      checkEdges() {
        const wrap = this.$refs.tableWrap;
        if (!wrap) return;
        const threshold = 400;
        // No overflow at all -- typically a filter (compte/client/type/
        // écarts) has thinned the visible rows enough that the loaded
        // window's worth of matches doesn't fill the viewport. scrollTop
        // is stuck at 0 either way, so neither of the two checks below
        // means anything on its own; try both directions instead of
        // waiting for a scroll that can never happen with nothing to
        // scroll.
        const notScrollable = wrap.scrollHeight <= wrap.clientHeight;
        if (notScrollable || wrap.scrollTop < threshold) this.loadOlder();
        if (notScrollable || wrap.scrollTop + wrap.clientHeight > wrap.scrollHeight - threshold) this.loadNewer();
      },
      // Whether compte/client/type/écarts thin filteredRows down from
      // whatever's actually loaded -- loadOlder()/loadNewer() use this to
      // widen the trim cap (MAX_LOADED_MONTHS_FILTERED instead of
      // MAX_LOADED_MONTHS), since the normal cap actively works against a
      // sparse filter: extending one end and immediately trimming the
      // other off nets out to almost the same slice every round, so a
      // filter with only a few matches a year could search almost forever
      // without surfacing more of them.
      isFiltering() {
        return !!(this.filterCompte || this.filterClient || this.filterType || this.onlyErrors);
      },
      // Keeps extending the window (both directions) as long as a filter
      // leaves too few matching rows to fill the viewport -- otherwise
      // there's never another scroll event to hang further loading off
      // of, and the sliding window silently stops responding the moment a
      // filter (compte/client/type/écarts) makes the visible page short
      // enough to not need a scrollbar.
      //
      // Bounded by a round count regardless, as a safety net: addMonths()
      // uses JS's Date#setMonth(), which isn't invertible for month-end
      // dates (e.g. 2025-03-31 minus 1 month lands on 2025-03-03, not
      // 2025-02-28, because setMonth(1) overflows February), so even with
      // the widened cap above, "no change since last round" isn't a
      // guaranteed way to detect "there's genuinely nothing more to find".
      async ensureScrollable(round = 0) {
        if (this.filterYear || round >= MAX_ENSURE_SCROLLABLE_ROUNDS) return;
        const wrap = this.$refs.tableWrap;
        if (!wrap) return;
        await this.$nextTick();
        if (wrap.scrollHeight > wrap.clientHeight) return;
        const beforeStart = this.windowStart;
        const beforeEnd = this.windowEnd;
        await this.loadOlder();
        await this.loadNewer();
        if (this.windowStart === beforeStart && this.windowEnd === beforeEnd) return;
        await this.ensureScrollable(round + 1);
      },
      // Which year is "at the top" of the visible area right now (just
      // under the sticky thead) -- drives the totals footer. Works
      // regardless of grouping mode: every rendered row (group header or
      // data row) carries a data-year attribute.
      detectCurrentYear() {
        const wrap = this.$refs.tableWrap;
        const table = this.$refs.tableEl;
        if (!wrap || !table) return;
        const thead = table.querySelector('thead');
        const wrapRect = wrap.getBoundingClientRect();
        const thresholdY = wrapRect.top + (thead ? thead.getBoundingClientRect().height : 0) + 2;
        const rows = table.querySelectorAll('tbody tr[data-year]');
        let year = null;
        for (const tr of rows) {
          const rect = tr.getBoundingClientRect();
          if (rect.bottom > thresholdY) {
            year = tr.dataset.year;
            break;
          }
        }
        if (year && year !== this.currentYear) {
          this.currentYear = year;
          this.loadCurrentYearTotals();
        }
      },
      onScroll() {
        if (this._scrollRaf) return;
        this._scrollRaf = requestAnimationFrame(() => {
          this._scrollRaf = null;
          this.detectCurrentYear();
          this.checkEdges();
        });
      },
      // mounted() only runs once, but `v-if="loading"` swaps out the
      // <div ref="tableWrap"> for a fresh DOM node every time loading
      // toggles true -> false (enterYearMode/exitYearMode/jumpToYear all
      // do this) -- the old node's scroll listener goes with it, silently
      // leaving the new one with no listener at all (checkEdges() and
      // detectCurrentYear(), and so the footer, stop responding to
      // scroll). Call this after every such transition, once the new
      // wrap exists; the dataset flag makes it a no-op if the element is
      // unchanged.
      ensureScrollListener() {
        const wrap = this.$refs.tableWrap;
        if (wrap && !wrap.dataset.figliScrollBound) {
          wrap.dataset.figliScrollBound = '1';
          wrap.addEventListener('scroll', this.onScroll, { passive: true });
        }
      },
      async loadCurrentYearTotals() {
        if (!this.currentYear) return;
        this.currentYearLoading = true;
        try {
          this.currentYearTotals = await fetchYearTotals(this.currentYear);
        } catch (err) {
          this.currentYearTotals = null;
        } finally {
          this.currentYearLoading = false;
        }
      },
      // Picking a specific "Année" bypasses the sliding window entirely --
      // load exactly that year (a bounded, small fetch on its own) rather
      // than post-filtering whatever happens to be in the current window,
      // which could easily be empty for a year the user hasn't scrolled
      // to yet.
      async enterYearMode(year) {
        this.loading = true;
        this.error = null;
        try {
          const start = year + '-01-01';
          const end = (parseInt(year, 10) + 1) + '-01-01';
          const { data, includedMap } = await fetchLignes(rangeUrl(start, end));
          this.rows = buildRows(data, includedMap);
          this.windowStart = start;
          this.windowEnd = end;
        } catch (err) {
          this.error = err.message;
        } finally {
          this.loading = false;
        }
        await this.$nextTick();
        if (this.$refs.tableWrap) this.$refs.tableWrap.scrollTop = 0;
        this.ensureScrollListener();
        this.detectCurrentYear();
      },
      // Back to "Toutes" -- resume the normal sliding window, re-centered
      // on today rather than trying to resume exactly where the year
      // filter was applied from.
      async exitYearMode() {
        await this.load();
        await this.$nextTick();
        const wrap = this.$refs.tableWrap;
        if (wrap) wrap.scrollTop = wrap.scrollHeight;
        this.ensureScrollListener();
        this.detectCurrentYear();
      },
      // "Aller à" -- a one-shot navigation shortcut, distinct from the
      // "Année" filter: it re-centers the sliding window on 1 January of
      // the chosen year and scrolls there, but (unlike filterYear) doesn't
      // restrict the view to just that year -- scrolling up/down still
      // extends the window normally, so you can still see the overlap
      // with neighbouring years.
      onJumpYearChange() {
        const year = this.jumpYearValue;
        this.jumpYearValue = ''; // reset immediately -- this is an action, not a sticky filter
        this.jumpToYear(year);
      },
      async jumpToYear(year) {
        if (!year) return;
        // A year filter would otherwise fight with the window this sets
        // below -- clear it first, silencing the watcher's own
        // exitYearMode() so its (different) window doesn't race this one.
        if (this.filterYear) {
          this._skipYearWatch = true;
          this.filterYear = '';
        }
        this.lastJumpYear = year;
        this.syncHash();
        this.loading = true;
        this.error = null;
        try {
          const yearStart = year + '-01-01';
          this.windowStart = yearStart;
          this.windowEnd = addMonths(yearStart, WINDOW_MONTHS * 2);
          const { data, includedMap } = await fetchLignes(rangeUrl(this.windowStart, this.windowEnd));
          this.rows = buildRows(data, includedMap);
        } catch (err) {
          this.error = err.message;
        } finally {
          this.loading = false;
        }
        await this.$nextTick();
        const wrap = this.$refs.tableWrap;
        if (wrap) wrap.scrollTop = 0;
        this.ensureScrollListener();
        this.detectCurrentYear();
        this.checkEdges();
      },
      // Reflects the current filters + "Aller à" target in the URL hash
      // (replacing, not pushing, so tweaking a dropdown doesn't spam the
      // back button with history entries) -- reload the page or share the
      // link and readHashState()/mounted() reproduce the same view.
      syncHash() {
        const hash = buildHashString({
          filterCompte: this.filterCompte,
          filterClient: this.filterClient,
          filterType: this.filterType,
          filterYear: this.filterYear,
          onlyErrors: this.onlyErrors,
          lastJumpYear: this.lastJumpYear,
        });
        const url = location.pathname + location.search + (hash ? '#' + hash : '');
        history.replaceState(null, '', url);
      },
    },
    watch: {
      filterYear(newYear, oldYear) {
        if (this._skipYearWatch) {
          this._skipYearWatch = false;
          return;
        }
        if (newYear) {
          this.enterYearMode(newYear);
        } else if (oldYear) {
          this.exitYearMode();
        }
        this.syncHash();
      },
      // Any of these can thin filteredRows enough to remove the
      // scrollbar the sliding window relies on to keep loading -- see
      // ensureScrollable(). filterYear is handled separately above (it
      // swaps the whole loading strategy, not just the visible subset).
      // Each also reflects into the URL hash so the filtered view is
      // reloadable/shareable -- see syncHash().
      filterCompte() {
        this.ensureScrollable();
        this.syncHash();
      },
      filterClient() {
        this.ensureScrollable();
        this.syncHash();
      },
      filterType() {
        this.ensureScrollable();
        this.syncHash();
      },
      onlyErrors() {
        this.ensureScrollable();
        this.syncHash();
      },
    },
    async mounted() {
      // Reproduce whatever the URL hash describes -- reload or a shared
      // link should land on the same filtered view. The four basic
      // filters just narrow filteredRows, so they're safe to set before
      // deciding how to load; filterYear/aller each own their loading
      // path (enterYearMode()/jumpToYear()), so at most one of those
      // runs instead of the default load().
      const hashState = readHashState();
      this.filterCompte = hashState.filterCompte;
      this.filterClient = hashState.filterClient;
      this.filterType = hashState.filterType;
      this.onlyErrors = hashState.onlyErrors;

      if (hashState.filterYear) {
        this.filterYear = hashState.filterYear;
      } else if (hashState.aller) {
        this.lastJumpYear = hashState.aller;
        this.jumpToYear(hashState.aller);
      } else {
        await this.load();
        await this.$nextTick();
        const wrap = this.$refs.tableWrap;
        this.ensureScrollListener();
        if (wrap) {
          // Start scrolled to the most recent data (the window is
          // centered on "today", so that's the bottom of what's loaded).
          wrap.scrollTop = wrap.scrollHeight;
        }
        this.detectCurrentYear();
        this.checkEdges();
        this.ensureScrollable();
      }

      // Independent of the row window, so the dropdowns don't shrink to
      // "whatever happens to be loaded right now".
      fetchClientNames().then((names) => { this.allClientsList = names; }).catch(() => {});
      fetchYearsList().then((years) => { this.allYearsList = years; }).catch(() => {});
      fetchOuvertureEcarts().then((ecarts) => { this.ouvertureEcarts = ecarts; }).catch(() => {});
      jQuery(document).on('dialog:afterclose', () => this.reloadWindow());
    },
  };

  Drupal.behaviors.figliComptaHome = {
    attach(context) {
      const root = context.querySelector ? context.querySelector('#figli-home-app') : null;
      if (root && !root.dataset.figliInitialized) {
        root.dataset.figliInitialized = '1';
        Vue.createApp(App).mount(root);
      }
    },
  };
})(Drupal, Vue, jQuery);