(() => {
    'use strict';

    const PTA = window.PTA;
    if (!PTA) throw new Error('PTA core doit être chargé avant dashboard.js');

    const { utils } = PTA;
    const { readJsonResponse, apiErrorMessage, escapeHtml, formatDuration, formatDate } = utils;

    const elements = {
        week: document.querySelector('#dashboard-week'),
        weekLabel: document.querySelector('#dashboard-week-label'),
        weekContext: document.querySelector('#dashboard-week-context'),
        refresh: document.querySelector('#dashboard-refresh'),
        message: document.querySelector('#dashboard-message'),
        loading: document.querySelector('#dashboard-loading'),

        pendingCount: document.querySelector('#dashboard-pending-count'),
        pendingDetail: document.querySelector('#dashboard-pending-detail'),
        pendingTile: document.querySelector('#dashboard-tile-pending'),
        pendingList: document.querySelector('#dashboard-pending-list'),
        pendingEmpty: document.querySelector('#dashboard-pending-empty'),

        coverageCount: document.querySelector('#dashboard-coverage-count'),
        coverageDetail: document.querySelector('#dashboard-coverage-detail'),
        coverageTile: document.querySelector('#dashboard-tile-coverage'),
        coverageList: document.querySelector('#dashboard-coverage-list'),
        coverageEmpty: document.querySelector('#dashboard-coverage-empty'),
        coverageLink: document.querySelector('#dashboard-coverage-link'),
        coverageUnconfigured: document.querySelector('#dashboard-coverage-unconfigured'),

        quotaCount: document.querySelector('#dashboard-quota-count'),
        quotaDetail: document.querySelector('#dashboard-quota-detail'),
        quotaTile: document.querySelector('#dashboard-tile-quota'),
        quotaSubtitle: document.querySelector('#dashboard-quota-subtitle'),
        quotaAgents: document.querySelector('#dashboard-quota-agents'),
        quotaRate: document.querySelector('#dashboard-quota-rate'),
        quotaRateDetail: document.querySelector('#dashboard-quota-rate-detail'),
        quotaRemaining: document.querySelector('#dashboard-quota-remaining'),
        quotaEmptyAgents: document.querySelector('#dashboard-quota-empty'),
        quotaBody: document.querySelector('#dashboard-quota-body'),
        quotaEmptyState: document.querySelector('#dashboard-quota-empty-state'),

        setupCount: document.querySelector('#dashboard-setup-count'),
        setupDetail: document.querySelector('#dashboard-setup-detail'),
        setupTile: document.querySelector('#dashboard-tile-setup'),

        navBadge: document.querySelector('#pending-validation-tab-badge'),
    };

    let pendingItems = [];
    let loading = false;

    function setMessage(text = '', type = 'info') {
        if (!elements.message) return;
        elements.message.className = text ? `message message-${type}` : 'message';
        elements.message.textContent = text;
    }

    /**
     * Une tuile est neutre quand il n'y a rien à faire, alertante dès qu'un
     * compteur remonte. La couleur ne dit rien de plus que le chiffre : elle
     * évite juste d'avoir à lire les quatre tuiles pour savoir où agir.
     */
    function setTileTone(tile, count) {
        if (!tile) return;
        tile.classList.toggle('is-alert', Number(count) > 0);
        tile.classList.toggle('is-clear', Number(count) === 0);
    }

    function plural(count, singular, pluralForm) {
        return Number(count) > 1 ? pluralForm : singular;
    }

    function weekParam() {
        return elements.week?.value || '';
    }

    function weekValueOf(item) {
        return `${item.annee}-W${String(item.numero_semaine).padStart(2, '0')}`;
    }

    function setNavBadge(count) {
        if (!elements.navBadge) return;
        elements.navBadge.textContent = String(count);
        elements.navBadge.hidden = Number(count) === 0;
        elements.navBadge.setAttribute(
            'aria-label',
            `${count} planning${Number(count) > 1 ? 's' : ''} en attente de validation`
        );
    }

    function renderWeek(week) {
        if (!week) return;
        const contexteLabel = {
            PERISCOLAIRE: 'Semaine scolaire — contexte périscolaire',
            EXTRASCOLAIRE: 'Semaine de vacances — contexte extrascolaire',
            MIXTE: 'Semaine à cheval entre période scolaire et vacances',
        }[week.contexte] || '';

        if (elements.weekLabel) {
            elements.weekLabel.textContent =
                `Semaine ${week.numero} · du ${formatDate(week.date_debut)} au ${formatDate(week.date_fin)}`;
        }
        if (elements.weekContext) {
            const vacances = Array.isArray(week.vacances_libelles) ? week.vacances_libelles : [];
            const suffix = vacances.length ? ` (${vacances.join(', ')})` : '';
            elements.weekContext.textContent = contexteLabel ? `${contexteLabel}${suffix}` : '';
            elements.weekContext.hidden = !contexteLabel;
        }
        if (elements.coverageLink) {
            elements.coverageLink.href = `coverage.php?week=${encodeURIComponent(week.valeur)}`;
        }
        if (elements.coverageTile) {
            elements.coverageTile.href = `coverage.php?week=${encodeURIComponent(week.valeur)}`;
        }
    }

    function renderPending(validation) {
        const count = Number(validation.count || 0);
        pendingItems = Array.isArray(validation.apercu) ? validation.apercu : [];

        setNavBadge(count);
        setTileTone(elements.pendingTile, count);
        if (elements.pendingCount) elements.pendingCount.textContent = String(count);
        if (elements.pendingDetail) {
            elements.pendingDetail.textContent = count === 0
                ? 'Aucun brouillon en attente'
                : `${formatDuration(Number(validation.minutes_decomptees || 0))} décomptées · `
                  + `${validation.agent_count} ${plural(validation.agent_count, 'agent', 'agents')} · `
                  + `${validation.structure_count} ${plural(validation.structure_count, 'lieu', 'lieux')}`;
        }

        if (elements.pendingEmpty) elements.pendingEmpty.hidden = count !== 0;
        if (!elements.pendingList) return;

        elements.pendingList.innerHTML = pendingItems.map((item) => `
            <li class="dashboard-list-item">
                <div class="dashboard-list-main">
                    <strong>${escapeHtml(item.agent_prenom)} ${escapeHtml(item.agent_nom)}</strong>
                    <small>${escapeHtml(item.structure_nom)} · semaine ${Number(item.numero_semaine)} du ${formatDate(item.date_debut)}</small>
                </div>
                <div class="dashboard-list-meta">
                    <span>${Number(item.nombre_creneaux)} ${plural(item.nombre_creneaux, 'créneau', 'créneaux')}</span>
                    <strong>${formatDuration(Number(item.total_minutes || 0))}</strong>
                </div>
                <button class="button button-success dashboard-list-action" type="button" data-planning-id="${Number(item.id_planning)}">
                    Contrôler
                </button>
            </li>
        `).join('');
    }

    function renderCoverage(coverage, week, perimetre) {
        const gapCount = Number(coverage.gap_count || 0);
        const unconfigured = Number(coverage.unconfigured_count || 0);
        // Sans aucun lieu enregistré, « tous les minimums sont atteints » serait
        // vrai mais trompeur : il n'y a simplement rien à contrôler.
        const sansLieu = Number(perimetre?.structures || 0) === 0;

        setTileTone(elements.coverageTile, gapCount);
        setTileTone(elements.setupTile, unconfigured);

        if (elements.coverageCount) elements.coverageCount.textContent = String(gapCount);
        if (elements.coverageDetail) {
            elements.coverageDetail.textContent = gapCount === 0
                ? (sansLieu ? 'Aucun lieu d’affectation enregistré' : 'Tous les minimums sont atteints')
                : `${formatDuration(Number(coverage.gap_minutes || 0))} non couvertes · `
                  + `${coverage.structure_count} ${plural(coverage.structure_count, 'lieu concerné', 'lieux concernés')}`;
        }
        if (elements.setupCount) elements.setupCount.textContent = String(unconfigured);
        if (elements.setupDetail) {
            elements.setupDetail.textContent = unconfigured === 0
                ? (sansLieu ? 'Aucun lieu à paramétrer pour l’instant' : 'Tous les lieux ont des horaires attendus')
                : 'Aucun minimum d’agents n’y est contrôlé';
        }

        const items = Array.isArray(coverage.apercu) ? coverage.apercu : [];
        if (elements.coverageEmpty) elements.coverageEmpty.hidden = items.length !== 0;
        if (elements.coverageList) {
            const weekValue = week?.valeur || '';
            elements.coverageList.innerHTML = items.map((gap) => {
                const href = `coverage.php?week=${encodeURIComponent(weekValue)}&structure_id=${Number(gap.id_structure)}`;
                return `
                    <li class="dashboard-list-item">
                        <div class="dashboard-list-main">
                            <strong>${escapeHtml(gap.structure_nom)}</strong>
                            <small>${escapeHtml(gap.jour_libelle)} ${formatDate(gap.date)} · ${escapeHtml(gap.heure_debut)} → ${escapeHtml(gap.heure_fin)}</small>
                        </div>
                        <div class="dashboard-list-meta">
                            <span>${Number(gap.agents_planifies)} / ${Number(gap.minimum_agents)} agents</span>
                            <strong class="dashboard-gap-count">−${Number(gap.agents_manquants)}</strong>
                        </div>
                        <a class="button button-secondary dashboard-list-action" href="${href}">Analyser</a>
                    </li>`;
            }).join('');
        }

        if (elements.coverageUnconfigured) {
            const list = Array.isArray(coverage.unconfigured) ? coverage.unconfigured : [];
            if (list.length === 0) {
                elements.coverageUnconfigured.hidden = true;
                elements.coverageUnconfigured.textContent = '';
            } else {
                const names = list.map((structure) => escapeHtml(structure.nom)).join(', ');
                const reste = unconfigured - list.length;
                elements.coverageUnconfigured.innerHTML =
                    `<strong>Non contrôlés :</strong> ${names}${reste > 0 ? ` et ${reste} autre${reste > 1 ? 's' : ''}` : ''}. `
                    + 'Définissez leurs horaires de couverture dans l’administration.';
                elements.coverageUnconfigured.hidden = false;
            }
        }
    }

    function renderQuota(quota) {
        const overCount = Number(quota.depassement_count || 0);
        setTileTone(elements.quotaTile, overCount);

        if (elements.quotaCount) elements.quotaCount.textContent = String(overCount);
        if (elements.quotaDetail) {
            elements.quotaDetail.textContent = overCount === 0
                ? (Number(quota.agent_count || 0) === 0
                    ? 'Aucun agent actif à suivre'
                    : `Aucun dépassement sur ${quota.annee}`)
                : `Sur ${quota.agent_count} ${plural(quota.agent_count, 'agent suivi', 'agents suivis')} en ${quota.annee}`;
        }
        if (elements.quotaTile) {
            elements.quotaTile.href = `annual.php?year=${Number(quota.annee)}`;
        }
        if (elements.quotaSubtitle) {
            elements.quotaSubtitle.textContent =
                `Année civile ${quota.annee} · heures validées et brouillon comprises, motifs décomptés uniquement.`;
        }
        if (elements.quotaAgents) elements.quotaAgents.textContent = String(quota.agent_count || 0);
        if (elements.quotaRate) elements.quotaRate.textContent = `${Number(quota.taux_global || 0)} %`;
        if (elements.quotaRateDetail) {
            elements.quotaRateDetail.textContent =
                `${formatDuration(Number(quota.minutes_affectees || 0))} sur ${formatDuration(Number(quota.minutes_cible || 0))}`;
        }
        if (elements.quotaRemaining) elements.quotaRemaining.textContent = formatDuration(Number(quota.minutes_restantes || 0));
        if (elements.quotaEmptyAgents) elements.quotaEmptyAgents.textContent = String(quota.sans_heure_count || 0);

        const items = Array.isArray(quota.apercu) ? quota.apercu : [];
        if (elements.quotaEmptyState) elements.quotaEmptyState.hidden = items.length !== 0;
        if (!elements.quotaBody) return;

        elements.quotaBody.innerHTML = items.map((agent) => {
            const over = Number(agent.minutes_restantes) < 0;
            const rate = Number(agent.taux_consommation || 0);
            const href = `annual.php?agent_id=${Number(agent.id_agent)}&year=${Number(quota.annee)}`;
            return `
                <tr class="${over ? 'is-over-quota' : ''}">
                    <td>
                        <strong>${escapeHtml(agent.prenom)} ${escapeHtml(agent.nom)}</strong>
                        <small>${escapeHtml(agent.poste_libelle || 'Poste non renseigné')}</small>
                    </td>
                    <td>${escapeHtml(agent.structure_nom || 'Non rattaché')}</td>
                    <td>
                        <strong>${formatDuration(Number(agent.quota_cible_minutes || 0))}</strong>
                        <small>quotité ${Number(agent.quotite_travail)} %</small>
                    </td>
                    <td>
                        <strong>${formatDuration(Number(agent.minutes_affectees || 0))}</strong>
                        <small>${formatDuration(Number(agent.minutes_brouillon || 0))} en brouillon</small>
                    </td>
                    <td class="dashboard-quota-gauge-cell">
                        <progress class="dashboard-quota-gauge${over ? ' is-over' : ''}" max="100" value="${Math.min(100, Math.max(0, rate))}" aria-hidden="true"></progress>
                        <span>${rate} %</span>
                    </td>
                    <td class="dashboard-quota-action-cell">
                        <a class="button button-secondary" href="${href}">Ouvrir</a>
                    </td>
                </tr>`;
        }).join('');
    }

    function openPendingPlanning(item) {
        if (!item) return;
        const params = new URLSearchParams({
            structure_id: String(item.id_structure),
            agent_id: String(item.id_agent),
            week: weekValueOf(item),
            focus: 'validation',
            notice: `Planning de ${item.agent_prenom} ${item.agent_nom} ouvert depuis le tableau de bord.`,
        });
        window.location.href = `planning.php?${params.toString()}`;
    }

    async function load(options = {}) {
        if (loading) return;
        loading = true;
        if (!options.silent) setMessage('');
        if (elements.loading) elements.loading.hidden = false;
        if (elements.refresh) elements.refresh.disabled = true;

        try {
            const query = new URLSearchParams();
            const week = weekParam();
            if (week) query.set('week', week);

            const response = await fetch(`api/dashboard_summary.php?${query.toString()}`, {
                headers: { Accept: 'application/json' },
            });
            const data = await readJsonResponse(response);
            if (!response.ok) throw new Error(apiErrorMessage(data, 'Impossible de charger le tableau de bord.'));

            renderWeek(data.semaine);
            renderPending(data.validation || {});
            renderCoverage(data.couverture || {}, data.semaine, data.perimetre);
            renderQuota(data.quota || {});
        } catch (error) {
            setMessage(error.message, 'error');
        } finally {
            loading = false;
            if (elements.loading) elements.loading.hidden = true;
            if (elements.refresh) elements.refresh.disabled = false;
        }
    }

    function init() {
        elements.refresh?.addEventListener('click', () => load());
        elements.week?.addEventListener('change', () => load());
        elements.pendingList?.addEventListener('click', (event) => {
            const trigger = event.target.closest('[data-planning-id]');
            if (!trigger) return;
            const id = Number(trigger.dataset.planningId);
            openPendingPlanning(pendingItems.find((item) => Number(item.id_planning) === id));
        });

        load({ silent: true });
    }

    PTA.modules.dashboard = { init, load, refresh: load };
})();