(() => {
    'use strict';

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

    const { elements, utils } = PTA;
    const { readJsonResponse, apiErrorMessage, escapeHtml, formatDuration, formatDate } = utils;
    const badge = document.querySelector('#coverage-tab-badge');
    const weekInput = document.querySelector('#coverage-week');
    const structureFilter = document.querySelector('#coverage-structure-filter');
    const refreshButton = document.querySelector('#refresh-coverage-alerts');
    const loadingElement = document.querySelector('#coverage-loading');
    const emptyElement = document.querySelector('#coverage-empty');
    const contentElement = document.querySelector('#coverage-content');
    const bodyElement = document.querySelector('#coverage-alerts-body');
    const messageElement = document.querySelector('#coverage-message');
    const unconfiguredElement = document.querySelector('#coverage-unconfigured');

    const ruleStructureSelect = document.querySelector('#coverage-rules-structure');
    const ruleEditor = document.querySelector('#coverage-rules-editor');
    const ruleMessage = document.querySelector('#coverage-rules-message');
    const loadRulesButton = document.querySelector('#load-coverage-rules');
    const saveRulesButton = document.querySelector('#save-coverage-rules');

    const dayNames = {
        1: 'Lundi',
        2: 'Mardi',
        3: 'Mercredi',
        4: 'Jeudi',
        5: 'Vendredi',
    };

    let alerts = [];
    let loading = false;

    function setBadge(count) {
        if (!badge) return;
        badge.textContent = String(count);
        badge.hidden = count === 0;
        badge.setAttribute('aria-label', `${count} plage${count > 1 ? 's' : ''} avec couverture insuffisante`);
    }

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

    function renderAlerts(data) {
        alerts = Array.isArray(data.alerts) ? data.alerts : [];
        const summary = data.summary || {};
        const unconfigured = Array.isArray(data.unconfigured_structures) ? data.unconfigured_structures : [];

        setBadge(alerts.length);
        document.querySelector('#coverage-gap-count').textContent = String(Number(summary.gap_count || 0));
        document.querySelector('#coverage-structure-count').textContent = String(Number(summary.affected_structure_count || 0));
        document.querySelector('#coverage-gap-hours').textContent = formatDuration(Number(summary.gap_minutes || 0));
        document.querySelector('#coverage-unconfigured-count').textContent = String(Number(summary.unconfigured_structure_count || 0));

        if (loadingElement) loadingElement.hidden = true;
        if (emptyElement) emptyElement.hidden = alerts.length !== 0;
        if (contentElement) contentElement.hidden = alerts.length === 0;

        if (bodyElement) {
            bodyElement.innerHTML = alerts.map((alert, index) => {
                const missing = Number(alert.agents_manquants || 0);
                return `
                    <tr class="coverage-alert-row" data-alert-index="${index}">
                        <td>
                            <strong>${escapeHtml(alert.structure_nom)}</strong>
                            <small>${escapeHtml(alert.structure_code || '')}</small>
                        </td>
                        <td>
                            <strong>${escapeHtml(alert.jour_libelle)}</strong>
                            <small>${formatDate(alert.date)}</small>
                        </td>
                        <td><strong>${escapeHtml(alert.heure_debut)}–${escapeHtml(alert.heure_fin)}</strong></td>
                        <td>${Number(alert.minimum_agents)}</td>
                        <td>${Number(alert.agents_planifies)}</td>
                        <td><span class="coverage-missing-chip">${missing} agent${missing > 1 ? 's' : ''}</span></td>
                        <td class="coverage-action-cell"><button type="button" class="button button-primary open-coverage-gap" data-alert-index="${index}">Planifier un agent</button></td>
                    </tr>`;
            }).join('');
        }

        if (unconfiguredElement) {
            unconfiguredElement.hidden = unconfigured.length === 0;
            unconfiguredElement.innerHTML = unconfigured.length ? `
                <strong>Couverture non configurée pour ${unconfigured.length} lieu${unconfigured.length > 1 ? 'x' : ''}</strong>
                <p>${unconfigured.map((item) => escapeHtml(item.nom)).join(', ')}. Configurez les plages attendues dans la page Administration pour pouvoir détecter les créneaux vides.</p>
            ` : '';
        }
    }

    async function refresh(options = {}) {
        if (loading) return;
        const week = weekInput?.value;
        if (!week) return;

        loading = true;
        if (!options.silent) setMessage('');
        if (loadingElement) loadingElement.hidden = false;
        if (refreshButton) refreshButton.disabled = true;

        try {
            const params = new URLSearchParams({ week });
            if (structureFilter?.value) params.set('structure_id', structureFilter.value);
            const response = await fetch(`api/coverage_alerts.php?${params.toString()}`, { headers: { Accept: 'application/json' } });
            const data = await readJsonResponse(response);
            if (!response.ok) throw new Error(apiErrorMessage(data, 'Impossible d’analyser la couverture.'));
            renderAlerts(data);
        } catch (error) {
            if (loadingElement) loadingElement.hidden = true;
            setMessage(error.message, 'error');
        } finally {
            loading = false;
            if (refreshButton) refreshButton.disabled = false;
        }
    }

    function openGap(alert) {
        if (!alert) return;
        const params = new URLSearchParams({
            structure_id: String(alert.id_structure),
            week: weekInput?.value || '',
            notice: `Couverture insuffisante le ${alert.jour_libelle.toLowerCase()} ${formatDate(alert.date)} de ${alert.heure_debut} à ${alert.heure_fin} sur ${alert.structure_nom}. Choisissez un agent à affecter.`,
        });
        window.location.href = `planning.php?${params.toString()}`;
    }

    function coverageRuleRow(rule = {}) {
        return `
            <div class="coverage-rule-row">
                <label class="field compact-field">
                    <span>Début</span>
                    <input class="coverage-rule-start" type="time" step="900" value="${escapeHtml(rule.heure_debut || '')}" required>
                </label>
                <label class="field compact-field">
                    <span>Fin</span>
                    <input class="coverage-rule-end" type="time" step="900" value="${escapeHtml(rule.heure_fin || '')}" required>
                </label>
                <label class="field compact-field coverage-rule-minimum-field">
                    <span>Agents min.</span>
                    <input class="coverage-rule-minimum" type="number" min="1" max="50" step="1" value="${Number(rule.minimum_agents || 1)}" required>
                </label>
                <button type="button" class="button button-danger remove-coverage-rule" aria-label="Supprimer cette plage">Supprimer</button>
            </div>`;
    }

    function renderRuleEditor(rules = []) {
        if (!ruleEditor) return;
        const grouped = new Map();
        for (let day = 1; day <= 5; day += 1) grouped.set(day, []);
        rules.forEach((rule) => grouped.get(Number(rule.jour_semaine))?.push(rule));

        ruleEditor.innerHTML = Array.from(grouped.entries()).map(([day, dayRules]) => `
            <section class="coverage-rule-day" data-day="${day}">
                <div class="coverage-rule-day-header">
                    <strong>${dayNames[day]}</strong>
                    <button type="button" class="button button-secondary add-coverage-rule">+ Ajouter une plage</button>
                </div>
                <div class="coverage-rule-day-ranges">
                    ${dayRules.length ? dayRules.map(coverageRuleRow).join('') : '<p class="coverage-rule-empty">Aucune couverture obligatoire configurée.</p>'}
                </div>
            </section>`).join('');

        if (saveRulesButton) saveRulesButton.disabled = false;
    }

    async function loadRules() {
        const structureId = ruleStructureSelect?.value;
        if (!structureId || !ruleEditor) {
            if (ruleEditor) ruleEditor.innerHTML = '<div class="empty-state">Choisissez un lieu d’affectation.</div>';
            if (saveRulesButton) saveRulesButton.disabled = true;
            return;
        }
        if (ruleMessage) {
            ruleMessage.className = 'message';
            ruleMessage.textContent = '';
        }
        ruleEditor.innerHTML = '<div class="empty-state">Chargement des règles de couverture…</div>';

        try {
            const response = await fetch(`api/structure_coverage_rules.php?structure_id=${encodeURIComponent(structureId)}`);
            const data = await readJsonResponse(response);
            if (!response.ok) throw new Error(apiErrorMessage(data, 'Impossible de charger les règles de couverture.'));
            renderRuleEditor(data.rules || []);
        } catch (error) {
            ruleEditor.innerHTML = '';
            if (ruleMessage) {
                ruleMessage.className = 'message message-error';
                ruleMessage.textContent = error.message;
            }
        }
    }

    function collectRules() {
        const rules = [];
        ruleEditor?.querySelectorAll('.coverage-rule-day').forEach((daySection) => {
            const day = Number(daySection.dataset.day);
            daySection.querySelectorAll('.coverage-rule-row').forEach((row) => {
                const start = row.querySelector('.coverage-rule-start')?.value || '';
                const end = row.querySelector('.coverage-rule-end')?.value || '';
                const minimum = Number(row.querySelector('.coverage-rule-minimum')?.value || 1);
                if (!start && !end) return;
                rules.push({ jour_semaine: day, heure_debut: start, heure_fin: end, minimum_agents: minimum });
            });
        });
        return rules;
    }

    async function saveRules() {
        const structureId = ruleStructureSelect?.value;
        if (!structureId || !saveRulesButton || !ruleMessage) return;

        saveRulesButton.disabled = true;
        ruleMessage.className = 'message';
        ruleMessage.textContent = '';
        try {
            const response = await fetch('api/save_structure_coverage_rules.php', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    csrf_token: window.PTA_CONFIG.csrfToken,
                    structure_id: Number(structureId),
                    rules: collectRules(),
                }),
            });
            const data = await readJsonResponse(response);
            if (!response.ok) throw new Error(apiErrorMessage(data, 'Impossible d’enregistrer les règles de couverture.'));
            renderRuleEditor(data.rules || []);
            ruleMessage.className = 'message message-success';
            ruleMessage.textContent = data.message;
            await refresh({ silent: true });
            if (document.querySelector('#overview-structure')?.value === String(structureId)) {
                await PTA.modules.structureOverview?.load?.();
            }
        } catch (error) {
            ruleMessage.className = 'message message-error';
            ruleMessage.textContent = error.message;
        } finally {
            saveRulesButton.disabled = false;
        }
    }

    function init() {
        refreshButton?.addEventListener('click', () => refresh());
        weekInput?.addEventListener('change', () => refresh());
        structureFilter?.addEventListener('change', () => refresh());
        bodyElement?.addEventListener('click', (event) => {
            const button = event.target.closest('.open-coverage-gap');
            if (!button) return;
            openGap(alerts[Number(button.dataset.alertIndex)]);
        });

        ruleStructureSelect?.addEventListener('change', loadRules);
        loadRulesButton?.addEventListener('click', loadRules);
        saveRulesButton?.addEventListener('click', saveRules);
        ruleEditor?.addEventListener('click', (event) => {
            const addButton = event.target.closest('.add-coverage-rule');
            if (addButton) {
                const day = addButton.closest('.coverage-rule-day');
                const ranges = day?.querySelector('.coverage-rule-day-ranges');
                if (!ranges) return;
                ranges.querySelector('.coverage-rule-empty')?.remove();
                ranges.insertAdjacentHTML('beforeend', coverageRuleRow());
                return;
            }
            const removeButton = event.target.closest('.remove-coverage-rule');
            if (removeButton) {
                const ranges = removeButton.closest('.coverage-rule-day-ranges');
                removeButton.closest('.coverage-rule-row')?.remove();
                if (ranges && !ranges.querySelector('.coverage-rule-row')) {
                    ranges.innerHTML = '<p class="coverage-rule-empty">Aucune couverture obligatoire configurée.</p>';
                }
            }
        });

        refresh({ silent: true });
    }

    PTA.modules.coverage = { init, refresh, loadRules };
})();