/**
 * marketplace_external.js — MercadoLibre integration UI
 */
(function() {
    'use strict';

    var API = '/pos/api/marketplace-ext';
    var TOKEN = localStorage.getItem('pos_token') || '';

    function headers() {
        return {
            'Authorization': 'Bearer ' + TOKEN,
            'Content-Type': 'application/json',
            'X-Device-Id': localStorage.getItem('pos_device_id') || 'web',
        };
    }

    // ─── Tabs ──────────────────────────────────────────────────────────────

    window.switchTab = function(tab) {
        document.querySelectorAll('.tab-btn').forEach(function(b) {
            b.classList.toggle('is-active', b.dataset.tab === tab);
            b.setAttribute('aria-selected', b.dataset.tab === tab ? 'true' : 'false');
        });
        document.querySelectorAll('.tab-panel').forEach(function(p) {
            p.classList.toggle('is-active', p.id === 'panel-' + tab);
        });
        if (tab === 'listings') loadListings();
        if (tab === 'orders') loadOrders();
    };

    function closeModal(id) {
        document.getElementById(id).classList.remove('is-open');
    }
    window.closeModal = closeModal;

    // ─── Config / Connection ───────────────────────────────────────────────

    async function loadConfig() {
        try {
            var res = await fetch(API + '/config', { headers: headers() });
            if (!res.ok) throw new Error('Failed to load config');
            var cfg = await res.json();

            var statusDiv = document.getElementById('configStatus');
            var formDiv = document.getElementById('configForm');
            var connectedDiv = document.getElementById('configConnected');

            if (cfg.connected) {
                statusDiv.innerHTML = '<span class="meli-status meli-status--active">● Conectado</span>';
                formDiv.style.display = 'none';
                connectedDiv.style.display = 'block';
                document.getElementById('connectedNickname').textContent = cfg.meli_user_id || 'Usuario ML';
                document.getElementById('connectedSite').textContent = cfg.meli_site_id || 'MLM';
            } else {
                statusDiv.innerHTML = '<span class="meli-status meli-status--pending">● No conectado</span>';
                formDiv.style.display = 'block';
                connectedDiv.style.display = 'none';
            }
        } catch (e) {
            console.error(e);
            document.getElementById('configStatus').innerHTML = '<p style="color:var(--color-danger);">Error cargando configuración</p>';
        }
    }

    window.startOAuth = function() {
        var clientId = document.getElementById('cfgClientId').value.trim();
        var clientSecret = document.getElementById('cfgClientSecret').value.trim();
        var category = document.getElementById('cfgCategory').value.trim();
        var shipping = document.getElementById('cfgShipping').value;

        if (!clientId || !clientSecret) {
            alert('Client ID y Client Secret son requeridos');
            return;
        }

        // Save config locally for the callback
        localStorage.setItem('meli_client_id', clientId);
        localStorage.setItem('meli_client_secret', clientSecret);
        localStorage.setItem('meli_category', category);
        localStorage.setItem('meli_shipping', shipping);

        var redirectUri = window.location.origin + '/pos/marketplace-external/callback';
        var authUrl = 'https://auth.mercadolibre.com.mx/authorization?response_type=code&client_id=' + encodeURIComponent(clientId) + '&redirect_uri=' + encodeURIComponent(redirectUri);
        window.location.href = authUrl;
    };

    window.disconnectMeli = async function() {
        if (!confirm('¿Desconectar MercadoLibre? Las publicaciones existentes no se eliminarán de ML.')) return;
        try {
            var res = await fetch(API + '/connect', { method: 'DELETE', headers: headers() });
            if (res.ok) {
                loadConfig();
            } else {
                alert('Error desconectando');
            }
        } catch (e) {
            alert('Error: ' + e.message);
        }
    };

    // ─── Listings ──────────────────────────────────────────────────────────

    var listingsData = [];

    window.loadListings = async function() {
        var container = document.getElementById('listingsContainer');
        container.innerHTML = '<div class="meli-card"><div class="skeleton skeleton--text"></div><div class="skeleton skeleton--text-sm" style="width:70%;"></div></div>'
            + '<div class="meli-card"><div class="skeleton skeleton--text"></div><div class="skeleton skeleton--text-sm" style="width:60%;"></div></div>'
            + '<div class="meli-card"><div class="skeleton skeleton--text"></div><div class="skeleton skeleton--text-sm" style="width:80%;"></div></div>';
        try {
            var res = await fetch(API + '/listings?page=1&per_page=50', { headers: headers() });
            if (!res.ok) throw new Error('Failed to load listings');
            var data = await res.json();
            listingsData = data.items || [];
            renderListings();
        } catch (e) {
            container.innerHTML = renderEmptyState({
                icon: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><path d="M8 21h8M12 17v4"/></svg>',
                title: 'Error cargando publicaciones',
                subtitle: 'No se pudieron obtener las publicaciones de MercadoLibre. Intenta de nuevo.'
            });
        }
    };

    function renderListings() {
        var container = document.getElementById('listingsContainer');
        var statusFilter = document.getElementById('listingStatusFilter').value;
        var search = document.getElementById('listingSearch').value.toLowerCase();

        var filtered = listingsData.filter(function(l) {
            if (statusFilter && l.external_status !== statusFilter) return false;
            if (search && !((l.title || '').toLowerCase().includes(search))) return false;
            return true;
        });

        if (!filtered.length) {
            container.innerHTML = renderEmptyState({
                icon: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><path d="M8 21h8M12 17v4"/></svg>',
                title: 'Sin publicaciones',
                subtitle: 'Aún no hay publicaciones en MercadoLibre. Ve a Inventario y publica un producto.',
                action: '<a href="/pos/inventory" class="btn btn--meli btn--sm">Ir a Inventario</a>'
            });
            return;
        }

        container.innerHTML = filtered.map(function(l) {
            var statusClass = 'meli-status--' + (l.external_status || 'pending');
            return '<div class="meli-card">'
                + '<div style="display:flex;justify-content:space-between;align-items:start;margin-bottom:var(--space-3);">'
                +   '<div style="font-weight:700;font-size:var(--text-body-sm);line-height:1.3;">' + escapeHtml(l.title || l.inventory_name || 'Sin título') + '</div>'
                +   '<span class="meli-status ' + statusClass + '">' + (l.external_status || '—') + '</span>'
                + '</div>'
                + '<div style="font-size:var(--text-caption);color:var(--color-text-muted);margin-bottom:var(--space-2);">'
                +   'SKU: ' + escapeHtml(l.part_number || '—') + ' · ID ML: ' + escapeHtml(l.external_item_id || '—')
                + '</div>'
                + '<div style="display:flex;gap:var(--space-2);margin-top:var(--space-3);">'
                +   '<button class="btn btn--ghost btn--xs" onclick="syncListing(' + l.id + ')">Sync</button>'
                +   (l.external_status === 'active' ? '<button class="btn btn--ghost btn--xs" onclick="pauseListing(' + l.id + ')">Pausar</button>' : '<button class="btn btn--ghost btn--xs" onclick="activateListing(' + l.id + ')">Activar</button>')
                +   '<button class="btn btn--danger btn--xs" onclick="deleteListing(' + l.id + ')">Cerrar</button>'
                + '</div>'
                + '</div>';
        }).join('');
    }

    window.filterListings = renderListings;

    window.syncListing = async function(id) {
        try {
            var res = await fetch(API + '/listings/' + id + '/sync', { method: 'POST', headers: headers() });
            var data = await res.json();
            if (res.ok) {
                showToast('Sincronizado: $' + data.price + ' · Stock: ' + data.stock, 'ok', { title: 'Publicación actualizada' });
                loadListings();
            } else {
                showToast(data.error || 'Error desconocido', 'error', { title: 'Error de sincronización' });
            }
        } catch (e) {
            showToast(e.message, 'error', { title: 'Error de red' });
        }
    };

    window.pauseListing = async function(id) {
        try {
            var res = await fetch(API + '/listings/' + id + '/pause', { method: 'POST', headers: headers() });
            if (res.ok) { loadListings(); } else { alert('Error'); }
        } catch (e) { alert('Error: ' + e.message); }
    };

    window.activateListing = async function(id) {
        try {
            var res = await fetch(API + '/listings/' + id + '/activate', { method: 'POST', headers: headers() });
            if (res.ok) { loadListings(); } else { alert('Error'); }
        } catch (e) { alert('Error: ' + e.message); }
    };

    window.deleteListing = async function(id) {
        if (!confirm('¿Cerrar esta publicación en MercadoLibre?')) return;
        try {
            var res = await fetch(API + '/listings/' + id, { method: 'DELETE', headers: headers() });
            if (res.ok) { loadListings(); } else { alert('Error'); }
        } catch (e) { alert('Error: ' + e.message); }
    };

    // ─── Orders ────────────────────────────────────────────────────────────

    var ordersData = [];

    window.loadOrders = async function() {
        var tbody = document.getElementById('ordersTableBody');
        tbody.innerHTML = renderSkeletonRows(6, 5);
        try {
            var res = await fetch(API + '/orders?page=1&per_page=50', { headers: headers() });
            if (!res.ok) throw new Error('Failed to load orders');
            var data = await res.json();
            ordersData = data.items || [];
            renderOrders();
        } catch (e) {
            tbody.innerHTML = '<tr><td colspan="6">' + renderEmptyState({
                icon: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><path d="M8 21h8M12 17v4"/></svg>',
                title: 'Error cargando órdenes',
                subtitle: 'No se pudieron obtener las órdenes de MercadoLibre.'
            }) + '</td></tr>';
        }
    };

    function renderOrders() {
        var tbody = document.getElementById('ordersTableBody');
        var statusFilter = document.getElementById('orderStatusFilter').value;
        var search = document.getElementById('orderSearch').value.toLowerCase();

        var filtered = ordersData.filter(function(o) {
            if (statusFilter && o.status !== statusFilter) return false;
            if (search && !((o.buyer_name || '').toLowerCase().includes(search) || (o.external_order_id || '').includes(search))) return false;
            return true;
        });

        if (!filtered.length) {
            tbody.innerHTML = '<tr><td colspan="6">' + renderEmptyState({
                icon: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><path d="M8 21h8M12 17v4"/></svg>',
                title: 'Sin órdenes',
                subtitle: 'No hay órdenes de MercadoLibre en este momento.'
            }) + '</td></tr>';
            return;
        }

        tbody.innerHTML = filtered.map(function(o) {
            var statusClass = 'meli-status--' + (o.status || 'pending');
            return '<tr>'
                + '<td><a href="#" onclick="showOrderDetail(' + o.id + ');return false;">' + escapeHtml(o.external_order_id) + '</a></td>'
                + '<td>' + escapeHtml(o.buyer_name || o.buyer_nickname || '—') + '</td>'
                + '<td style="text-align:right">$' + (o.total_amount || 0).toFixed(2) + '</td>'
                + '<td><span class="meli-status ' + statusClass + '">' + (o.status || '—') + '</span></td>'
                + '<td>' + (o.created_at ? o.created_at.split('T')[0] : '—') + '</td>'
                + '<td>'
                +   (o.status === 'pending' ? '<button class="btn btn--primary btn--xs" onclick="convertOrder(' + o.id + ')">Convertir a Venta</button> ' : '')
                +   '<button class="btn btn--ghost btn--xs" onclick="showOrderDetail(' + o.id + ')">Ver</button>'
                + '</td>'
                + '</tr>';
        }).join('');
    }

    window.filterOrders = renderOrders;

    window.showOrderDetail = async function(id) {
        var modal = document.getElementById('orderModal');
        var body = document.getElementById('orderModalBody');
        var footer = document.getElementById('orderModalFooter');
        body.innerHTML = 'Cargando...';
        footer.innerHTML = '';
        modal.classList.add('is-open');

        try {
            var res = await fetch(API + '/orders/' + id, { headers: headers() });
            var o = await res.json();
            if (!res.ok) throw new Error(o.error || 'Error');

            var itemsHtml = (o.items || []).map(function(it) {
                return '<tr><td>' + escapeHtml(it.title || '—') + '</td><td>' + it.quantity + '</td><td style="text-align:right">$' + (it.unit_price || 0).toFixed(2) + '</td></tr>';
            }).join('');

            body.innerHTML = '<div style="margin-bottom:var(--space-4);">'
                + '<p><strong>Comprador:</strong> ' + escapeHtml(o.buyer_name || '—') + ' (' + escapeHtml(o.buyer_nickname || '—') + ')</p>'
                + '<p><strong>Email:</strong> ' + escapeHtml(o.buyer_email || '—') + '</p>'
                + '<p><strong>Teléfono:</strong> ' + escapeHtml(o.buyer_phone || '—') + '</p>'
                + '<p><strong>Total:</strong> $' + (o.total_amount || 0).toFixed(2) + '</p>'
                + '<p><strong>Estado ML:</strong> ' + escapeHtml(o.external_status || '—') + '</p>'
                + '<p><strong>Estado Nexus:</strong> ' + escapeHtml(o.status || '—') + '</p>'
                + '</div>'
                + '<h4 style="margin:var(--space-3) 0;">Items</h4>'
                + '<table class="data-table"><thead><tr><th>Producto</th><th>Cantidad</th><th style="text-align:right">Precio</th></tr></thead><tbody>' + itemsHtml + '</tbody></table>';

            footer.innerHTML = '';
            if (o.status === 'pending') {
                footer.innerHTML += '<button class="btn btn--primary" onclick="convertOrder(' + o.id + ');closeModal(\'orderModal\')">Convertir a Venta</button> ';
            }
            if (o.status === 'confirmed') {
                footer.innerHTML += '<button class="btn btn--primary" onclick="updateOrderStatus(' + o.id + ', \'packed\')">Marcar Empacada</button> ';
            }
            if (o.status === 'packed') {
                footer.innerHTML += '<button class="btn btn--primary" onclick="updateOrderStatus(' + o.id + ', \'shipped\')">Marcar Enviada</button> ';
            }
            footer.innerHTML += '<button class="btn btn--ghost" onclick="closeModal(\'orderModal\')">Cerrar</button>';
        } catch (e) {
            body.innerHTML = '<p style="color:var(--color-danger)">Error: ' + escapeHtml(e.message) + '</p>';
        }
    };

    window.convertOrder = async function(id) {
        try {
            var res = await fetch(API + '/orders/' + id + '/convert', {
                method: 'POST',
                headers: headers(),
                body: JSON.stringify({})
            });
            var data = await res.json();
            if (res.ok) {
                showToast('Orden convertida a venta #' + data.sale_id, 'ok', { title: 'Venta creada' });
                loadOrders();
            } else {
                showToast(data.error || 'Error desconocido', 'error', { title: 'Error al convertir' });
            }
        } catch (e) {
            showToast(e.message, 'error', { title: 'Error de red' });
        }
    };

    window.updateOrderStatus = async function(id, status) {
        try {
            var res = await fetch(API + '/orders/' + id + '/status', {
                method: 'POST',
                headers: headers(),
                body: JSON.stringify({ status: status })
            });
            if (res.ok) { loadOrders(); } else { alert('Error'); }
        } catch (e) { alert('Error: ' + e.message); }
    };

    // ─── Utils ─────────────────────────────────────────────────────────────

    function escapeHtml(text) {
        if (!text) return '';
        var div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }

    // ─── Init ──────────────────────────────────────────────────────────────

    // Handle OAuth callback
    var urlParams = new URLSearchParams(window.location.search);
    var authCode = urlParams.get('code');
    if (authCode && window.location.pathname.includes('marketplace-external')) {
        (async function() {
            var clientId = localStorage.getItem('meli_client_id');
            var clientSecret = localStorage.getItem('meli_client_secret');
            var redirectUri = window.location.origin + '/pos/marketplace-external/callback';
            try {
                var res = await fetch(API + '/connect', {
                    method: 'POST',
                    headers: headers(),
                    body: JSON.stringify({
                        code: authCode,
                        client_id: clientId,
                        client_secret: clientSecret,
                        redirect_uri: redirectUri,
                    })
                });
                var data = await res.json();
                if (res.ok) {
                    alert('¡Conectado exitosamente con MercadoLibre!');
                    window.history.replaceState({}, document.title, '/pos/marketplace-external');
                    loadConfig();
                } else {
                    alert('Error conectando: ' + (data.error || 'Unknown'));
                }
            } catch (e) {
                alert('Error: ' + e.message);
            }
        })();
    }

    // ML Status Cards (sparkline simulation)
    window.loadMeliStats = async function() {
        var container = document.getElementById('meliStatsBar');
        if (!container) return;
        try {
            var res = await fetch(API + '/listings?page=1&per_page=200', { headers: headers() });
            if (!res.ok) throw new Error('Failed');
            var data = await res.json();
            var items = data.items || [];
            var active = items.filter(function(l) { return l.external_status === 'active'; }).length;
            var paused = items.filter(function(l) { return l.external_status === 'paused'; }).length;
            var closed = items.filter(function(l) { return l.external_status === 'closed'; }).length;
            var total = items.length;

            var html = '<div style="display:flex;gap:var(--space-4);flex-wrap:wrap;margin-bottom:var(--space-4);">' +
                '<div class="kpi-card" style="flex:1;min-width:160px;"><div class="kpi-card__label">Activas</div><div class="kpi-card__value" style="color:var(--color-success);">' + active + '</div></div>' +
                '<div class="kpi-card" style="flex:1;min-width:160px;"><div class="kpi-card__label">Pausadas</div><div class="kpi-card__value" style="color:var(--color-warning);">' + paused + '</div></div>' +
                '<div class="kpi-card" style="flex:1;min-width:160px;"><div class="kpi-card__label">Cerradas</div><div class="kpi-card__value" style="color:var(--color-error);">' + closed + '</div></div>' +
                '<div class="kpi-card" style="flex:1;min-width:160px;"><div class="kpi-card__label">Total</div><div class="kpi-card__value">' + total + '</div></div>';
            // Sparkline simulation
            html += '<div class="kpi-card" style="flex:1;min-width:200px;"><div class="kpi-card__label">Tendencia</div><div id="meliSparkline"></div></div>';
            html += '</div>';
            container.innerHTML = html;
            if (typeof renderSparkline === 'function') {
                renderSparkline('#meliSparkline', [active, paused, closed, total % 50, active - 2, paused + 1, closed, active], { prefix: '' });
            }
        } catch(e) {
            container.innerHTML = '';
        }
    };

    // Kanban Order View
    var _orderViewMode = 'table';
    window.toggleOrderView = function() {
        _orderViewMode = _orderViewMode === 'table' ? 'kanban' : 'table';
        document.getElementById('ordersTableView').style.display = _orderViewMode === 'table' ? '' : 'none';
        document.getElementById('ordersKanbanView').style.display = _orderViewMode === 'kanban' ? '' : 'none';
        document.getElementById('btnKanbanView').textContent = _orderViewMode === 'table' ? '📋 Kanban' : '📄 Tabla';
        if (_orderViewMode === 'kanban') renderKanbanOrders();
    };

    function renderKanbanOrders() {
        var container = document.getElementById('ordersKanbanView');
        if (!container) return;
        var columns = [
            { key: 'pending', label: 'Pendientes', badge: 'badge--pending' },
            { key: 'confirmed', label: 'Confirmadas', badge: 'badge--ok' },
            { key: 'packed', label: 'Empacadas', badge: 'badge--transit' },
            { key: 'shipped', label: 'Enviadas', badge: 'badge--transit' },
            { key: 'delivered', label: 'Entregadas', badge: 'badge--complete' },
            { key: 'cancelled', label: 'Canceladas', badge: 'badge--cancelled' },
        ];
        var html = '<div class="kanban">';
        columns.forEach(function(col) {
            var items = ordersData.filter(function(o) { return o.status === col.key; });
            html += '<div class="kanban__col" data-status="' + col.key + '">';
            html += '<div class="kanban__col-header">' + col.label + '<span class="kanban__col-count ' + col.badge + '">' + items.length + '</span></div>';
            html += '<div class="kanban__cards">';
            items.slice(0, 20).forEach(function(o) {
                html += '<div class="kanban__card" draggable="true" data-id="' + o.id + '">' +
                    '<div class="kanban__card-title">' + escapeHtml(o.buyer_name || o.buyer_nickname || '—') + '</div>' +
                    '<div class="kanban__card-meta">$' + (o.total_amount || 0).toFixed(2) + ' · ' + escapeHtml(o.external_order_id || '') + '</div>' +
                    '</div>';
            });
            if (items.length > 20) html += '<div style="text-align:center;font-size:11px;color:var(--color-text-muted);padding:8px;">+' + (items.length - 20) + ' más</div>';
            html += '</div></div>';
        });
        html += '</div>';
        container.innerHTML = html;
    }

    // Register Cmd+K items
    if (typeof registerCmdKItem === 'function') {
        registerCmdKItem({ group: 'MercadoLibre', label: 'Configuración ML', href: '/pos/marketplace-external', icon: '⚙️' });
        registerCmdKItem({ group: 'MercadoLibre', label: 'Publicaciones ML', href: '/pos/marketplace-external#listings', icon: '📦' });
        registerCmdKItem({ group: 'MercadoLibre', label: 'Órdenes ML', href: '/pos/marketplace-external#orders', icon: '🛒' });
    }

    document.addEventListener('DOMContentLoaded', function() {
        loadConfig();
    });
})();