// static/vendor/js/orders.js
/**
 * Vendor orders management page logic
 * View and manage vendor's orders
 */

const vendorOrdersLog = window.LogConfig.loggers.vendorOrders ||
    window.LogConfig.createLogger('vendorOrders', false);

vendorOrdersLog.info('Loading...');

function vendorOrders() {
    vendorOrdersLog.info('vendorOrders() called');

    return {
        // Inherit base layout state
        ...data(),

        // Set page identifier
        currentPage: 'orders',

        // Loading states
        loading: true,
        error: '',
        saving: false,

        // Orders data
        orders: [],
        stats: {
            total: 0,
            pending: 0,
            processing: 0,
            completed: 0,
            cancelled: 0
        },

        // Order statuses for filter and display
        statuses: [
            { value: 'pending', label: 'Pending', color: 'yellow' },
            { value: 'processing', label: 'Processing', color: 'blue' },
            { value: 'partially_shipped', label: 'Partially Shipped', color: 'orange' },
            { value: 'shipped', label: 'Shipped', color: 'indigo' },
            { value: 'delivered', label: 'Delivered', color: 'green' },
            { value: 'completed', label: 'Completed', color: 'green' },
            { value: 'cancelled', label: 'Cancelled', color: 'red' },
            { value: 'refunded', label: 'Refunded', color: 'gray' }
        ],

        // Filters
        filters: {
            search: '',
            status: '',
            date_from: '',
            date_to: ''
        },

        // Pagination
        pagination: {
            page: 1,
            per_page: 20,
            total: 0,
            pages: 0
        },

        // Modal states
        showDetailModal: false,
        showStatusModal: false,
        showBulkStatusModal: false,
        selectedOrder: null,
        newStatus: '',
        bulkStatus: '',

        // Bulk selection
        selectedOrders: [],

        // Debounce timer
        searchTimeout: null,

        // Computed: Total pages
        get totalPages() {
            return this.pagination.pages;
        },

        // Computed: Start index for pagination display
        get startIndex() {
            if (this.pagination.total === 0) return 0;
            return (this.pagination.page - 1) * this.pagination.per_page + 1;
        },

        // Computed: End index for pagination display
        get endIndex() {
            const end = this.pagination.page * this.pagination.per_page;
            return end > this.pagination.total ? this.pagination.total : end;
        },

        // Computed: Page numbers for pagination
        get pageNumbers() {
            const pages = [];
            const totalPages = this.totalPages;
            const current = this.pagination.page;

            if (totalPages <= 7) {
                for (let i = 1; i <= totalPages; i++) {
                    pages.push(i);
                }
            } else {
                pages.push(1);
                if (current > 3) pages.push('...');
                const start = Math.max(2, current - 1);
                const end = Math.min(totalPages - 1, current + 1);
                for (let i = start; i <= end; i++) {
                    pages.push(i);
                }
                if (current < totalPages - 2) pages.push('...');
                pages.push(totalPages);
            }
            return pages;
        },

        // Computed: Check if all visible orders are selected
        get allSelected() {
            return this.orders.length > 0 && this.selectedOrders.length === this.orders.length;
        },

        // Computed: Check if some but not all orders are selected
        get someSelected() {
            return this.selectedOrders.length > 0 && this.selectedOrders.length < this.orders.length;
        },

        async init() {
            vendorOrdersLog.info('Orders init() called');

            // Guard against multiple initialization
            if (window._vendorOrdersInitialized) {
                vendorOrdersLog.warn('Already initialized, skipping');
                return;
            }
            window._vendorOrdersInitialized = true;

            // Load platform settings for rows per page
            if (window.PlatformSettings) {
                this.pagination.per_page = await window.PlatformSettings.getRowsPerPage();
            }

            try {
                await this.loadOrders();
            } catch (error) {
                vendorOrdersLog.error('Init failed:', error);
                this.error = 'Failed to initialize orders page';
            }

            vendorOrdersLog.info('Orders initialization complete');
        },

        /**
         * Load orders with filtering and pagination
         */
        async loadOrders() {
            this.loading = true;
            this.error = '';

            try {
                const params = new URLSearchParams({
                    skip: (this.pagination.page - 1) * this.pagination.per_page,
                    limit: this.pagination.per_page
                });

                // Add filters
                if (this.filters.search) {
                    params.append('search', this.filters.search);
                }
                if (this.filters.status) {
                    params.append('status', this.filters.status);
                }
                if (this.filters.date_from) {
                    params.append('date_from', this.filters.date_from);
                }
                if (this.filters.date_to) {
                    params.append('date_to', this.filters.date_to);
                }

                const response = await apiClient.get(`/vendor/${this.vendorCode}/orders?${params.toString()}`);

                this.orders = response.orders || [];
                this.pagination.total = response.total || 0;
                this.pagination.pages = Math.ceil(this.pagination.total / this.pagination.per_page);

                // Calculate stats
                this.calculateStats();

                vendorOrdersLog.info('Loaded orders:', this.orders.length, 'of', this.pagination.total);
            } catch (error) {
                vendorOrdersLog.error('Failed to load orders:', error);
                this.error = error.message || 'Failed to load orders';
            } finally {
                this.loading = false;
            }
        },

        /**
         * Calculate order statistics
         */
        calculateStats() {
            this.stats = {
                total: this.pagination.total,
                pending: this.orders.filter(o => o.status === 'pending').length,
                processing: this.orders.filter(o => o.status === 'processing').length,
                completed: this.orders.filter(o => ['completed', 'delivered'].includes(o.status)).length,
                cancelled: this.orders.filter(o => o.status === 'cancelled').length
            };
        },

        /**
         * Debounced search handler
         */
        debouncedSearch() {
            clearTimeout(this.searchTimeout);
            this.searchTimeout = setTimeout(() => {
                this.pagination.page = 1;
                this.loadOrders();
            }, 300);
        },

        /**
         * Apply filter and reload
         */
        applyFilter() {
            this.pagination.page = 1;
            this.loadOrders();
        },

        /**
         * Clear all filters
         */
        clearFilters() {
            this.filters = {
                search: '',
                status: '',
                date_from: '',
                date_to: ''
            };
            this.pagination.page = 1;
            this.loadOrders();
        },

        /**
         * View order details - navigates to detail page
         */
        viewOrder(order) {
            window.location.href = `/vendor/${this.vendorCode}/orders/${order.id}`;
        },

        /**
         * Open status change modal
         */
        openStatusModal(order) {
            this.selectedOrder = order;
            this.newStatus = order.status;
            this.showStatusModal = true;
        },

        /**
         * Update order status
         */
        async updateStatus() {
            if (!this.selectedOrder || !this.newStatus) return;

            this.saving = true;
            try {
                await apiClient.put(`/vendor/${this.vendorCode}/orders/${this.selectedOrder.id}/status`, {
                    status: this.newStatus
                });

                Utils.showToast('Order status updated', 'success');
                vendorOrdersLog.info('Updated order status:', this.selectedOrder.id, this.newStatus);

                this.showStatusModal = false;
                this.selectedOrder = null;
                await this.loadOrders();
            } catch (error) {
                vendorOrdersLog.error('Failed to update status:', error);
                Utils.showToast(error.message || 'Failed to update status', 'error');
            } finally {
                this.saving = false;
            }
        },

        /**
         * Get status color class
         */
        getStatusColor(status) {
            const statusObj = this.statuses.find(s => s.value === status);
            return statusObj ? statusObj.color : 'gray';
        },

        /**
         * Get status label
         */
        getStatusLabel(status) {
            const statusObj = this.statuses.find(s => s.value === status);
            return statusObj ? statusObj.label : status;
        },

        /**
         * Format price for display
         */
        formatPrice(cents) {
            if (!cents && cents !== 0) return '-';
            return new Intl.NumberFormat('de-DE', {
                style: 'currency',
                currency: 'EUR'
            }).format(cents / 100);
        },

        /**
         * Format date for display
         */
        formatDate(dateStr) {
            if (!dateStr) return '-';
            return new Date(dateStr).toLocaleDateString('de-DE', {
                year: 'numeric',
                month: 'short',
                day: 'numeric',
                hour: '2-digit',
                minute: '2-digit'
            });
        },

        /**
         * Pagination: Previous page
         */
        previousPage() {
            if (this.pagination.page > 1) {
                this.pagination.page--;
                this.loadOrders();
            }
        },

        /**
         * Pagination: Next page
         */
        nextPage() {
            if (this.pagination.page < this.totalPages) {
                this.pagination.page++;
                this.loadOrders();
            }
        },

        /**
         * Pagination: Go to specific page
         */
        goToPage(pageNum) {
            if (pageNum !== '...' && pageNum >= 1 && pageNum <= this.totalPages) {
                this.pagination.page = pageNum;
                this.loadOrders();
            }
        },

        // ============================================================================
        // BULK OPERATIONS
        // ============================================================================

        /**
         * Toggle select all orders on current page
         */
        toggleSelectAll() {
            if (this.allSelected) {
                this.selectedOrders = [];
            } else {
                this.selectedOrders = this.orders.map(o => o.id);
            }
        },

        /**
         * Toggle selection of a single order
         */
        toggleSelect(orderId) {
            const index = this.selectedOrders.indexOf(orderId);
            if (index === -1) {
                this.selectedOrders.push(orderId);
            } else {
                this.selectedOrders.splice(index, 1);
            }
        },

        /**
         * Check if order is selected
         */
        isSelected(orderId) {
            return this.selectedOrders.includes(orderId);
        },

        /**
         * Clear all selections
         */
        clearSelection() {
            this.selectedOrders = [];
        },

        /**
         * Open bulk status change modal
         */
        openBulkStatusModal() {
            if (this.selectedOrders.length === 0) return;
            this.bulkStatus = '';
            this.showBulkStatusModal = true;
        },

        /**
         * Execute bulk status update
         */
        async bulkUpdateStatus() {
            if (this.selectedOrders.length === 0 || !this.bulkStatus) return;

            this.saving = true;
            try {
                let successCount = 0;
                for (const orderId of this.selectedOrders) {
                    try {
                        await apiClient.put(`/vendor/${this.vendorCode}/orders/${orderId}/status`, {
                            status: this.bulkStatus
                        });
                        successCount++;
                    } catch (error) {
                        vendorOrdersLog.warn(`Failed to update order ${orderId}:`, error);
                    }
                }
                Utils.showToast(`${successCount} order(s) updated to ${this.getStatusLabel(this.bulkStatus)}`, 'success');
                this.showBulkStatusModal = false;
                this.clearSelection();
                await this.loadOrders();
            } catch (error) {
                vendorOrdersLog.error('Bulk status update failed:', error);
                Utils.showToast(error.message || 'Failed to update orders', 'error');
            } finally {
                this.saving = false;
            }
        },

        /**
         * Export selected orders as CSV
         */
        exportSelectedOrders() {
            if (this.selectedOrders.length === 0) return;

            const selectedOrderData = this.orders.filter(o => this.selectedOrders.includes(o.id));

            // Build CSV content
            const headers = ['Order ID', 'Date', 'Customer', 'Status', 'Total'];
            const rows = selectedOrderData.map(o => [
                o.order_number || o.id,
                this.formatDate(o.created_at),
                o.customer_name || o.customer_email || '-',
                this.getStatusLabel(o.status),
                this.formatPrice(o.total)
            ]);

            const csvContent = [
                headers.join(','),
                ...rows.map(row => row.map(cell => `"${cell}"`).join(','))
            ].join('\n');

            // Download
            const blob = new Blob([csvContent], { type: 'text/csv;charset=utf-8;' });
            const link = document.createElement('a');
            link.href = URL.createObjectURL(blob);
            link.download = `orders_export_${new Date().toISOString().split('T')[0]}.csv`;
            link.click();

            Utils.showToast(`Exported ${selectedOrderData.length} order(s)`, 'success');
        }
    };
}