/**
 * @file
 * Aggregate dashboard: solde par compte / solde par client, computed
 * client-side from JSON:API. The line-by-line spreadsheet view is the
 * site's home page (home.js), not this one.
 */
(function (Drupal, Vue) {
  'use strict';

  const API_BASE = '/jsonapi/node/ligne_comptable';
  const EUR = new Intl.NumberFormat('fr-FR', { style: 'currency', currency: 'EUR' });

  async function fetchAllLignes() {
    let url = API_BASE + '?include=field_repartition,field_repartition.field_compte,field_client&page[limit]=50';
    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;
    }
    return { data: allData, includedMap };
  }

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

  function addTo(map, key, montant) {
    if (!map.has(key)) map.set(key, { entrees: 0, sorties: 0 });
    const row = map.get(key);
    if (montant >= 0) row.entrees += montant;
    else row.sorties += montant;
  }

  function computeAggregations(data, includedMap) {
    const parComptes = new Map();
    const parClients = new Map();
    for (const node of data) {
      const rels = node.relationships || {};
      const clientTerm = resolve(includedMap, rels.field_client && rels.field_client.data);
      const clientName = clientTerm ? clientTerm.attributes.name : '(sans client)';
      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)';
        addTo(parComptes, compteName, montant);
        addTo(parClients, clientName, montant);
      }
    }
    return { parComptes, parClients };
  }

  function mapToRows(map) {
    return Array.from(map.entries())
      .map(([name, v]) => ({ name, entrees: v.entrees, sorties: v.sorties, solde: v.entrees + v.sorties }))
      .sort((a, b) => a.solde - b.solde);
  }

  function totalsOf(rows) {
    return rows.reduce(
      (acc, r) => ({ entrees: acc.entrees + r.entrees, sorties: acc.sorties + r.sorties, solde: acc.solde + r.solde }),
      { entrees: 0, sorties: 0, solde: 0 }
    );
  }

  const App = {
    data() {
      return { loading: true, error: null, tables: [], lineCount: 0 };
    },
    methods: {
      formatEur(v) {
        return EUR.format(v);
      },
      rowClass(solde) {
        if (solde > 0.5) return 'positive';
        if (solde < -0.5) return 'negative';
        return '';
      },
      async load() {
        this.loading = true;
        this.error = null;
        try {
          const { data, includedMap } = await fetchAllLignes();
          this.lineCount = data.length;
          const { parComptes, parClients } = computeAggregations(data, includedMap);
          const comptesRows = mapToRows(parComptes);
          const clientsRows = mapToRows(parClients);
          this.tables = [
            { title: 'Solde par compte', note: this.lineCount + ' lignes comptables chargées.', rows: comptesRows, totals: totalsOf(comptesRows) },
            { title: 'Solde par client', note: 'Entrées créditées par client vs. montants sortis (versements, achats, charges) sur les lignes rattachées à ce client.', rows: clientsRows, totals: totalsOf(clientsRows) },
          ];
        } catch (err) {
          this.error = err.message;
        } finally {
          this.loading = false;
        }
      },
    },
    mounted() {
      this.load();
    },
  };

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