/**
 * bodega.js — Warehouse (Bodega) dashboard for Nexus Autoparts
 * Tabs: Mapeo de Columnas | Subir Inventario | Mi Inventario
 */
(function () {
    'use strict';

    var API = '';
    var selectedFile = null;
    var invPage = 1;
    var invQuery = '';

    // ================================================================
    // Auth helpers
    // ================================================================

    function getToken() {
        return localStorage.getItem('access_token') || '';
    }

    function getRole() {
        var token = getToken();
        if (!token) return null;
        try {
            var payload = JSON.parse(atob(token.split('.')[1]));
            return payload.role || null;
        } catch (e) {
            return null;
        }
    }

    function authHeaders(extra) {
        var h = { 'Authorization': 'Bearer ' + getToken() };
        if (extra) {
            for (var k in extra) { h[k] = extra[k]; }
        }
        return h;
    }

    function checkAuth() {
        var token = getToken();
        var role = getRole();
        if (!token || (role !== 'BODEGA' && role !== 'ADMIN')) {
            window.location.href = '/login.html';
            return false;
        }
        return true;
    }

    function tryRefreshToken() {
        var refresh = localStorage.getItem('refresh_token');
        if (!refresh) return Promise.reject(new Error('No refresh token'));
        return fetch(API + '/api/auth/refresh', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ refresh_token: refresh })
        }).then(function (r) {
            if (!r.ok) throw new Error('Refresh failed');
            return r.json();
        }).then(function (data) {
            if (data.access_token) {
                localStorage.setItem('access_token', data.access_token);
            }
            return data;
        });
    }

    // ================================================================
    // API helper with 401 retry
    // ================================================================

    function api(path, opts) {
        opts = opts || {};
        if (!opts.headers) opts.headers = {};
        opts.headers['Authorization'] = 'Bearer ' + getToken();

        return fetch(API + path, opts).then(function (r) {
            if (r.status === 401) {
                return tryRefreshToken().then(function () {
                    opts.headers['Authorization'] = 'Bearer ' + getToken();
                    return fetch(API + path, opts);
                }).then(function (r2) {
                    if (!r2.ok) return r2.json().then(function (d) { throw new Error(d.error || 'Error'); });
                    return r2.json();
                });
            }
            if (!r.ok) return r.json().then(function (d) { throw new Error(d.error || 'Error'); });
            return r.json();
        });
    }

    // ================================================================
    // Utilities
    // ================================================================

    function esc(s) {
        if (!s) return '';
        var d = document.createElement('div');
        d.textContent = s;
        return d.innerHTML;
    }

    function toast(msg, type) {
        var container = document.getElementById('toast-container');
        var el = document.createElement('div');
        el.className = 'toast ' + (type || 'success');
        el.textContent = msg;
        container.appendChild(el);
        setTimeout(function () { el.remove(); }, 3500);
    }

    function fmtDate(s) {
        if (!s) return '—';
        var d = new Date(s);
        return d.toLocaleDateString('es-MX', {
            year: 'numeric', month: 'short', day: 'numeric',
            hour: '2-digit', minute: '2-digit'
        });
    }

    function fmtPrice(v) {
        var n = parseFloat(v);
        if (isNaN(n)) return '—';
        return '$' + n.toLocaleString('es-MX', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
    }

    function statusBadge(status) {
        var map = {
            'completed': { cls: 'badge-success', label: 'Completado' },
            'success': { cls: 'badge-success', label: 'Completado' },
            'error': { cls: 'badge-error', label: 'Error' },
            'failed': { cls: 'badge-error', label: 'Fallido' },
            'pending': { cls: 'badge-pending', label: 'Pendiente' },
            'processing': { cls: 'badge-processing', label: 'Procesando' }
        };
        var info = map[(status || '').toLowerCase()] || { cls: 'badge-pending', label: status || 'Desconocido' };
        return '<span class="badge ' + info.cls + '">' + esc(info.label) + '</span>';
    }

    // ================================================================
    // Tab Switching
    // ================================================================

    document.querySelectorAll('.bodega-tab').forEach(function (tab) {
        tab.addEventListener('click', function () {
            document.querySelectorAll('.bodega-tab').forEach(function (t) { t.classList.remove('active'); });
            document.querySelectorAll('.bodega-section').forEach(function (s) { s.classList.remove('active'); });
            tab.classList.add('active');
            var section = document.getElementById('section-' + tab.getAttribute('data-tab'));
            if (section) section.classList.add('active');

            // Load data when switching tabs
            var target = tab.getAttribute('data-tab');
            if (target === 'subir') loadUploadHistory();
            if (target === 'inventario') loadInventory();
        });
    });

    // ================================================================
    // TAB 1: Mapeo de Columnas
    // ================================================================

    function loadMapping() {
        api('/api/inventory/mapping').then(function (data) {
            if (data.part_number) document.getElementById('map-part-number').value = data.part_number;
            if (data.price) document.getElementById('map-price').value = data.price;
            if (data.stock) document.getElementById('map-stock').value = data.stock;
            if (data.location) document.getElementById('map-location').value = data.location;
        }).catch(function () {
            // No mapping yet — fields stay empty
        });
    }

    document.getElementById('btn-save-mapping').addEventListener('click', function () {
        var partNumber = document.getElementById('map-part-number').value.trim();
        var price = document.getElementById('map-price').value.trim();
        var stock = document.getElementById('map-stock').value.trim();
        var location = document.getElementById('map-location').value.trim();
        var statusEl = document.getElementById('mapping-status');

        if (!partNumber || !price || !stock) {
            statusEl.textContent = 'Completa los campos obligatorios.';
            statusEl.className = 'status-msg error';
            return;
        }

        var body = {
            part_number: partNumber,
            price: price,
            stock: stock,
            location: location || null
        };

        statusEl.textContent = 'Guardando...';
        statusEl.className = 'status-msg';

        api('/api/inventory/mapping', {
            method: 'PUT',
            headers: authHeaders({ 'Content-Type': 'application/json' }),
            body: JSON.stringify(body)
        }).then(function () {
            statusEl.textContent = 'Mapeo guardado correctamente.';
            statusEl.className = 'status-msg success';
            toast('Mapeo guardado', 'success');
        }).catch(function (err) {
            statusEl.textContent = err.message || 'Error al guardar.';
            statusEl.className = 'status-msg error';
        });
    });

    // ================================================================
    // TAB 2: Subir Inventario
    // ================================================================

    var dropZone = document.getElementById('drop-zone');
    var fileInput = document.getElementById('file-input');

    dropZone.addEventListener('click', function () { fileInput.click(); });

    dropZone.addEventListener('dragover', function (e) {
        e.preventDefault();
        dropZone.classList.add('dragover');
    });

    dropZone.addEventListener('dragleave', function () {
        dropZone.classList.remove('dragover');
    });

    dropZone.addEventListener('drop', function (e) {
        e.preventDefault();
        dropZone.classList.remove('dragover');
        if (e.dataTransfer.files.length) {
            selectFile(e.dataTransfer.files[0]);
        }
    });

    fileInput.addEventListener('change', function () {
        if (fileInput.files.length) {
            selectFile(fileInput.files[0]);
        }
    });

    function selectFile(file) {
        var validTypes = [
            'text/csv',
            'application/vnd.ms-excel',
            'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
        ];
        var ext = (file.name || '').split('.').pop().toLowerCase();
        if (validTypes.indexOf(file.type) === -1 && ['csv', 'xls', 'xlsx'].indexOf(ext) === -1) {
            toast('Formato no soportado. Usa CSV o Excel.', 'error');
            return;
        }
        if (file.size > 10 * 1024 * 1024) {
            toast('El archivo excede 10MB.', 'error');
            return;
        }
        selectedFile = file;
        document.getElementById('selected-file-name').textContent = file.name + ' (' + (file.size / 1024).toFixed(1) + ' KB)';
        document.getElementById('selected-file').style.display = 'flex';
        document.getElementById('btn-upload').disabled = false;
    }

    document.getElementById('btn-clear-file').addEventListener('click', function () {
        selectedFile = null;
        fileInput.value = '';
        document.getElementById('selected-file').style.display = 'none';
        document.getElementById('btn-upload').disabled = true;
    });

    document.getElementById('btn-upload').addEventListener('click', function () {
        if (!selectedFile) return;

        var btn = document.getElementById('btn-upload');
        var statusEl = document.getElementById('upload-status');
        btn.disabled = true;
        statusEl.textContent = 'Subiendo...';
        statusEl.className = 'status-msg';

        var fd = new FormData();
        fd.append('file', selectedFile);

        fetch(API + '/api/inventory/upload', {
            method: 'POST',
            headers: { 'Authorization': 'Bearer ' + getToken() },
            body: fd
        }).then(function (r) {
            if (r.status === 401) {
                return tryRefreshToken().then(function () {
                    return fetch(API + '/api/inventory/upload', {
                        method: 'POST',
                        headers: { 'Authorization': 'Bearer ' + getToken() },
                        body: fd
                    });
                });
            }
            return r;
        }).then(function (r) {
            return r.json().then(function (data) {
                if (!r.ok) throw new Error(data.error || 'Error al subir');
                return data;
            });
        }).then(function (data) {
            statusEl.textContent = '';
            showUploadResult(data);
            toast('Archivo procesado correctamente.', 'success');
            loadUploadHistory();
            // Clear file selection
            selectedFile = null;
            fileInput.value = '';
            document.getElementById('selected-file').style.display = 'none';
            btn.disabled = true;
        }).catch(function (err) {
            statusEl.textContent = err.message || 'Error al subir archivo.';
            statusEl.className = 'status-msg error';
            btn.disabled = false;
        });
    });

    function showUploadResult(data) {
        var el = document.getElementById('upload-result');
        var imported = data.imported || data.imported_count || 0;
        var errors = data.errors || data.error_count || 0;
        var samples = data.error_samples || [];

        var html = '<h4>Resultado de la Carga</h4>';
        html += '<div class="result-stats">';
        html += '<span class="result-stat ok">Importados: ' + imported + '</span>';
        html += '<span class="result-stat err">Errores: ' + errors + '</span>';
        html += '</div>';

        if (samples.length) {
            html += '<div class="error-samples">';
            html += '<strong>Ejemplos de errores:</strong>';
            samples.forEach(function (s) {
                html += '<p>' + esc(typeof s === 'string' ? s : JSON.stringify(s)) + '</p>';
            });
            html += '</div>';
        }

        el.innerHTML = html;
        el.style.display = 'block';
    }

    function loadUploadHistory() {
        api('/api/inventory/uploads').then(function (data) {
            var rows = data.uploads || data.data || data || [];
            var tbody = document.getElementById('history-body');
            if (!Array.isArray(rows) || rows.length === 0) {
                tbody.innerHTML = '<tr><td colspan="5" class="empty-row">Sin cargas previas</td></tr>';
                return;
            }
            tbody.innerHTML = rows.map(function (r) {
                return '<tr>'
                    + '<td>' + esc(r.filename || r.archivo || '—') + '</td>'
                    + '<td>' + statusBadge(r.status || r.estado) + '</td>'
                    + '<td>' + (r.imported_count != null ? r.imported_count : (r.importados != null ? r.importados : '—')) + '</td>'
                    + '<td>' + (r.error_count != null ? r.error_count : (r.errores != null ? r.errores : '—')) + '</td>'
                    + '<td>' + fmtDate(r.created_at || r.fecha) + '</td>'
                    + '</tr>';
            }).join('');
        }).catch(function () {
            document.getElementById('history-body').innerHTML =
                '<tr><td colspan="5" class="empty-row">Error al cargar historial</td></tr>';
        });
    }

    // ================================================================
    // TAB 3: Mi Inventario
    // ================================================================

    function loadInventory() {
        var params = '?page=' + invPage;
        if (invQuery) params += '&q=' + encodeURIComponent(invQuery);

        api('/api/inventory/items' + params).then(function (data) {
            var items = data.data || data.items || [];
            var pagination = data.pagination || {};
            var tbody = document.getElementById('inv-body');

            if (!Array.isArray(items) || items.length === 0) {
                tbody.innerHTML = '<tr><td colspan="6" class="empty-row">Sin articulos en inventario</td></tr>';
                renderPagination(pagination);
                return;
            }

            tbody.innerHTML = items.map(function (it) {
                return '<tr>'
                    + '<td><strong>' + esc(it.part_number) + '</strong></td>'
                    + '<td>' + esc(it.name || it.nombre || '—') + '</td>'
                    + '<td>' + fmtPrice(it.price || it.precio) + '</td>'
                    + '<td>' + (it.stock != null ? it.stock : (it.existencias != null ? it.existencias : '—')) + '</td>'
                    + '<td>' + esc(it.location || it.ubicacion || '—') + '</td>'
                    + '<td>' + fmtDate(it.updated_at || it.actualizado) + '</td>'
                    + '</tr>';
            }).join('');

            renderPagination(pagination);
        }).catch(function () {
            document.getElementById('inv-body').innerHTML =
                '<tr><td colspan="6" class="empty-row">Error al cargar inventario</td></tr>';
        });
    }

    function renderPagination(pg) {
        var container = document.getElementById('inv-pagination');
        if (!pg || !pg.total_pages || pg.total_pages <= 1) {
            container.innerHTML = '';
            return;
        }

        var current = pg.page || pg.current_page || 1;
        var total = pg.total_pages;
        var html = '';

        html += '<button ' + (current <= 1 ? 'disabled' : '') + ' data-page="' + (current - 1) + '">Anterior</button>';

        var start = Math.max(1, current - 2);
        var end = Math.min(total, current + 2);

        if (start > 1) {
            html += '<button data-page="1">1</button>';
            if (start > 2) html += '<button disabled>...</button>';
        }

        for (var i = start; i <= end; i++) {
            html += '<button data-page="' + i + '"' + (i === current ? ' class="active"' : '') + '>' + i + '</button>';
        }

        if (end < total) {
            if (end < total - 1) html += '<button disabled>...</button>';
            html += '<button data-page="' + total + '">' + total + '</button>';
        }

        html += '<button ' + (current >= total ? 'disabled' : '') + ' data-page="' + (current + 1) + '">Siguiente</button>';

        container.innerHTML = html;

        container.querySelectorAll('button[data-page]').forEach(function (btn) {
            btn.addEventListener('click', function () {
                invPage = parseInt(btn.getAttribute('data-page'), 10);
                loadInventory();
            });
        });
    }

    // Search
    document.getElementById('btn-inv-search').addEventListener('click', function () {
        invQuery = document.getElementById('inv-search').value.trim();
        invPage = 1;
        loadInventory();
    });

    document.getElementById('inv-search').addEventListener('keydown', function (e) {
        if (e.key === 'Enter') {
            invQuery = this.value.trim();
            invPage = 1;
            loadInventory();
        }
    });

    // Clear All
    document.getElementById('btn-clear-all').addEventListener('click', function () {
        showConfirm(
            'Limpiar Inventario',
            'Se eliminaran todos los articulos de tu inventario. Esta accion no se puede deshacer.',
            function () {
                api('/api/inventory/items', {
                    method: 'DELETE',
                    headers: authHeaders()
                }).then(function () {
                    toast('Inventario limpiado correctamente.', 'success');
                    loadInventory();
                }).catch(function (err) {
                    toast(err.message || 'Error al limpiar inventario.', 'error');
                });
            }
        );
    });

    // ================================================================
    // Confirm Modal
    // ================================================================

    var confirmCallback = null;

    function showConfirm(title, msg, onConfirm) {
        document.getElementById('confirm-title').textContent = title;
        document.getElementById('confirm-msg').textContent = msg;
        document.getElementById('confirm-modal').classList.add('active');
        confirmCallback = onConfirm;
    }

    document.getElementById('confirm-cancel').addEventListener('click', function () {
        document.getElementById('confirm-modal').classList.remove('active');
        confirmCallback = null;
    });

    document.getElementById('confirm-ok').addEventListener('click', function () {
        document.getElementById('confirm-modal').classList.remove('active');
        if (confirmCallback) {
            confirmCallback();
            confirmCallback = null;
        }
    });

    document.getElementById('confirm-modal').addEventListener('click', function (e) {
        if (e.target === this) {
            this.classList.remove('active');
            confirmCallback = null;
        }
    });

    // ================================================================
    // Init
    // ================================================================

    if (checkAuth()) {
        loadMapping();
    }

})();