// static/vendor/js/customers.js
/**
 * Vendor customers management page logic
 * View and manage customer relationships
 */

const vendorCustomersLog = window.LogConfig.loggers.vendorCustomers ||
    window.LogConfig.createLogger('vendorCustomers', false);

vendorCustomersLog.info('Loading...');

function vendorCustomers() {
    vendorCustomersLog.info('vendorCustomers() called');

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

        // Set page identifier
        currentPage: 'customers',

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

        // Customers data
        customers: [],
        stats: {
            total: 0,
            active: 0,
            new_this_month: 0
        },

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

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

        // Modal states
        showDetailModal: false,
        showOrdersModal: false,
        selectedCustomer: null,
        customerOrders: [],

        // 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;
        },

        async init() {
            vendorCustomersLog.info('Customers init() called');

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

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

            try {
                await this.loadCustomers();
            } catch (error) {
                vendorCustomersLog.error('Init failed:', error);
                this.error = 'Failed to initialize customers page';
            }

            vendorCustomersLog.info('Customers initialization complete');
        },

        /**
         * Load customers with filtering and pagination
         */
        async loadCustomers() {
            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);
                }

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

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

                // Calculate stats
                this.stats = {
                    total: this.pagination.total,
                    active: this.customers.filter(c => c.is_active !== false).length,
                    new_this_month: this.customers.filter(c => {
                        if (!c.created_at) return false;
                        const created = new Date(c.created_at);
                        const now = new Date();
                        return created.getMonth() === now.getMonth() && created.getFullYear() === now.getFullYear();
                    }).length
                };

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

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

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

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

        /**
         * View customer details
         */
        async viewCustomer(customer) {
            this.loading = true;
            try {
                const response = await apiClient.get(`/vendor/${this.vendorCode}/customers/${customer.id}`);
                this.selectedCustomer = response;
                this.showDetailModal = true;
                vendorCustomersLog.info('Loaded customer details:', customer.id);
            } catch (error) {
                vendorCustomersLog.error('Failed to load customer details:', error);
                Utils.showToast(error.message || 'Failed to load customer details', 'error');
            } finally {
                this.loading = false;
            }
        },

        /**
         * View customer orders
         */
        async viewCustomerOrders(customer) {
            this.loading = true;
            try {
                const response = await apiClient.get(`/vendor/${this.vendorCode}/customers/${customer.id}/orders`);
                this.selectedCustomer = customer;
                this.customerOrders = response.orders || [];
                this.showOrdersModal = true;
                vendorCustomersLog.info('Loaded customer orders:', customer.id, this.customerOrders.length);
            } catch (error) {
                vendorCustomersLog.error('Failed to load customer orders:', error);
                Utils.showToast(error.message || 'Failed to load customer orders', 'error');
            } finally {
                this.loading = false;
            }
        },

        /**
         * Send message to customer
         */
        messageCustomer(customer) {
            window.location.href = `/vendor/${this.vendorCode}/messages?customer=${customer.id}`;
        },

        /**
         * Get customer initials for avatar
         */
        getInitials(customer) {
            const first = customer.first_name || '';
            const last = customer.last_name || '';
            return (first.charAt(0) + last.charAt(0)).toUpperCase() || '?';
        },

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

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

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

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

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