/**
 * @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.
 */
(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',
    autre: 'Autre',
    ouverture: 'Ouverture',
  };
  // Sorties that can be linked to the entrée client they pay out against
  // (field_entree_liee) -- charge/autre/ouverture aren't client-specific.
  const LINKABLE_TYPES = ['versement', 'achat', 'hebergement'];

  async function fetchAllLignes() {
    // 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.
    let url = API_BASE + '?include=field_repartition,field_repartition.field_compte,field_client,field_entree_liee&page[limit]=50&sort=field_date_ligne,drupal_internal__nid';
    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 };
  }

  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);
      const entreeLieeNode = resolve(includedMap, rels.field_entree_liee && rels.field_entree_liee.data);
      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),
        entreeLieeId: entreeLieeNode ? entreeLieeNode.id : null,
        entreeLieeLabel: entreeLieeNode ? (entreeLieeNode.attributes.title || null) : null,
      });
    }
    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'],
        filterCompte: '',
        filterClient: '',
        filterType: '',
        filterYear: '',
        groupBy: 'month',
        onlyErrors: false,
        hoverCol: null,
        filterEntreeId: null,
      };
    },
    computed: {
      allTypes() {
        return Object.entries(TYPE_LABELS).map(([value, label]) => ({ value, label }));
      },
      allClients() {
        return Array.from(new Set(this.rows.map((r) => r.client).filter(Boolean))).sort();
      },
      allYears() {
        return Array.from(new Set(this.rows.map((r) => (r.date || '').slice(0, 4)).filter(Boolean))).sort().reverse();
      },
      errorCount() {
        return this.rows.filter((r) => r.hasError).length;
      },
      sortiesByEntree() {
        const map = new Map();
        for (const r of this.rows) {
          if (!r.entreeLieeId) continue;
          if (!map.has(r.entreeLieeId)) map.set(r.entreeLieeId, []);
          map.get(r.entreeLieeId).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.
      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) {
            for (const [compte, montant] of Object.entries(s.parCompte)) {
              versementsParCompte[compte] = (versementsParCompte[compte] || 0) + montant;
            }
          }
          const comptes = new Set([...Object.keys(entreeRow.parCompte), ...Object.keys(versementsParCompte)]);
          let resteAVerser = 0;
          let surVerse = 0;
          const detail = [];
          for (const c of comptes) {
            const residual = Math.round(((entreeRow.parCompte[c] || 0) + (versementsParCompte[c] || 0)) * 100) / 100;
            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',
          });
        }
        return map;
      },
      footerTotals() {
        const parCompte = {};
        this.allComptes.forEach((c) => { parCompte[c] = 0; });
        let montantHt = 0, montantTtc = 0, ecart = 0;
        for (const r of this.filteredRows) {
          montantHt += r.montant_ht || 0;
          montantTtc += r.montant_ttc || 0;
          ecart += r.ecart || 0;
          for (const c of this.allComptes) {
            if (r.parCompte[c] !== undefined) parCompte[c] += r.parCompte[c];
          }
        }
        return { montant_ht: montantHt, montant_ttc: montantTtc, parCompte, ecart };
      },
      filteredRows() {
        // Drill-down mode: an entrée and only the sorties linked to it,
        // ignoring the other filters -- clicking its badge again clears it.
        if (this.filterEntreeId) {
          const entree = this.rows.find((r) => r.id === this.filterEntreeId);
          const linked = this.sortiesByEntree.get(this.filterEntreeId) || [];
          return entree ? [entree, ...linked] : linked;
        }
        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;
        });
      },
      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, 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 });
          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);
      },
      // 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;
      },
      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 { data, includedMap } = await fetchAllLignes();
          this.rows = buildRows(data, includedMap);
        } catch (err) {
          this.error = err.message;
        } finally {
          if (showLoading) this.loading = false;
        }
      },
    },
    mounted() {
      this.load();
      jQuery(document).on('dialog:afterclose', () => this.load(false));
    },
  };

  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);