// static/vendor/js/invoices.js
/**
 * Vendor invoice management page logic
 */

const invoicesLog = window.LogConfig?.createLogger('INVOICES') || console;

invoicesLog.info('[VENDOR INVOICES] Loading...');

function vendorInvoices() {
    invoicesLog.info('[VENDOR INVOICES] vendorInvoices() called');

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

        // Set page identifier
        currentPage: 'invoices',

        // Tab state
        activeTab: 'invoices',

        // Loading states
        loading: false,
        savingSettings: false,
        creatingInvoice: false,
        downloadingPdf: false,

        // Messages
        error: '',
        successMessage: '',

        // Settings
        hasSettings: false,
        settings: null,
        settingsForm: {
            company_name: '',
            company_address: '',
            company_city: '',
            company_postal_code: '',
            company_country: 'LU',
            vat_number: '',
            invoice_prefix: 'INV',
            default_vat_rate: '17.00',
            bank_name: '',
            bank_iban: '',
            bank_bic: '',
            payment_terms: 'Net 30 days',
            footer_text: ''
        },

        // Stats
        stats: {
            total_invoices: 0,
            total_revenue_cents: 0,
            draft_count: 0,
            issued_count: 0,
            paid_count: 0,
            cancelled_count: 0
        },

        // Invoices list
        invoices: [],
        totalInvoices: 0,
        page: 1,
        perPage: 20,
        filters: {
            status: ''
        },

        // Create invoice modal
        showCreateModal: false,
        createForm: {
            order_id: '',
            notes: ''
        },

        async init() {
            // Guard against multiple initialization
            if (window._vendorInvoicesInitialized) {
                return;
            }
            window._vendorInvoicesInitialized = true;

            // Call parent init first to set vendorCode from URL
            const parentInit = data().init;
            if (parentInit) {
                await parentInit.call(this);
            }

            await this.loadSettings();
            await this.loadStats();
            await this.loadInvoices();
        },

        /**
         * Load invoice settings
         */
        async loadSettings() {
            try {
                const response = await apiClient.get('/vendor/invoices/settings');
                if (response) {
                    this.settings = response;
                    this.hasSettings = true;
                    // Populate form with existing settings
                    this.settingsForm = {
                        company_name: response.company_name || '',
                        company_address: response.company_address || '',
                        company_city: response.company_city || '',
                        company_postal_code: response.company_postal_code || '',
                        company_country: response.company_country || 'LU',
                        vat_number: response.vat_number || '',
                        invoice_prefix: response.invoice_prefix || 'INV',
                        default_vat_rate: response.default_vat_rate?.toString() || '17.00',
                        bank_name: response.bank_name || '',
                        bank_iban: response.bank_iban || '',
                        bank_bic: response.bank_bic || '',
                        payment_terms: response.payment_terms || 'Net 30 days',
                        footer_text: response.footer_text || ''
                    };
                } else {
                    this.hasSettings = false;
                }
            } catch (error) {
                // 404 means not configured yet, which is fine
                if (error.status !== 404) {
                    invoicesLog.error('[VENDOR INVOICES] Failed to load settings:', error);
                }
                this.hasSettings = false;
            }
        },

        /**
         * Load invoice statistics
         */
        async loadStats() {
            try {
                const response = await apiClient.get('/vendor/invoices/stats');
                this.stats = {
                    total_invoices: response.total_invoices || 0,
                    total_revenue_cents: response.total_revenue_cents || 0,
                    draft_count: response.draft_count || 0,
                    issued_count: response.issued_count || 0,
                    paid_count: response.paid_count || 0,
                    cancelled_count: response.cancelled_count || 0
                };
            } catch (error) {
                invoicesLog.error('[VENDOR INVOICES] Failed to load stats:', error);
            }
        },

        /**
         * Load invoices list
         */
        async loadInvoices() {
            this.loading = true;
            this.error = '';

            try {
                const params = new URLSearchParams({
                    page: this.page.toString(),
                    per_page: this.perPage.toString()
                });

                if (this.filters.status) {
                    params.append('status', this.filters.status);
                }

                const response = await apiClient.get(`/vendor/invoices?${params}`);
                this.invoices = response.items || [];
                this.totalInvoices = response.total || 0;
            } catch (error) {
                invoicesLog.error('[VENDOR INVOICES] Failed to load invoices:', error);
                this.error = error.message || 'Failed to load invoices';
            } finally {
                this.loading = false;
            }
        },

        /**
         * Refresh all data
         */
        async refreshData() {
            await this.loadSettings();
            await this.loadStats();
            await this.loadInvoices();
            this.successMessage = 'Data refreshed';
            setTimeout(() => this.successMessage = '', 3000);
        },

        /**
         * Save invoice settings
         */
        async saveSettings() {
            if (!this.settingsForm.company_name) {
                this.error = 'Company name is required';
                return;
            }

            this.savingSettings = true;
            this.error = '';

            try {
                const payload = {
                    company_name: this.settingsForm.company_name,
                    company_address: this.settingsForm.company_address || null,
                    company_city: this.settingsForm.company_city || null,
                    company_postal_code: this.settingsForm.company_postal_code || null,
                    company_country: this.settingsForm.company_country || 'LU',
                    vat_number: this.settingsForm.vat_number || null,
                    invoice_prefix: this.settingsForm.invoice_prefix || 'INV',
                    default_vat_rate: parseFloat(this.settingsForm.default_vat_rate) || 17.0,
                    bank_name: this.settingsForm.bank_name || null,
                    bank_iban: this.settingsForm.bank_iban || null,
                    bank_bic: this.settingsForm.bank_bic || null,
                    payment_terms: this.settingsForm.payment_terms || null,
                    footer_text: this.settingsForm.footer_text || null
                };

                let response;
                if (this.hasSettings) {
                    // Update existing settings
                    response = await apiClient.put('/vendor/invoices/settings', payload);
                } else {
                    // Create new settings
                    response = await apiClient.post('/vendor/invoices/settings', payload);
                }

                this.settings = response;
                this.hasSettings = true;
                this.successMessage = 'Settings saved successfully';
            } catch (error) {
                invoicesLog.error('[VENDOR INVOICES] Failed to save settings:', error);
                this.error = error.message || 'Failed to save settings';
            } finally {
                this.savingSettings = false;
                setTimeout(() => this.successMessage = '', 5000);
            }
        },

        /**
         * Open create invoice modal
         */
        openCreateModal() {
            if (!this.hasSettings) {
                this.error = 'Please configure invoice settings first';
                this.activeTab = 'settings';
                return;
            }
            this.createForm = {
                order_id: '',
                notes: ''
            };
            this.showCreateModal = true;
        },

        /**
         * Create invoice from order
         */
        async createInvoice() {
            if (!this.createForm.order_id) {
                this.error = 'Please enter an order ID';
                return;
            }

            this.creatingInvoice = true;
            this.error = '';

            try {
                const payload = {
                    order_id: parseInt(this.createForm.order_id),
                    notes: this.createForm.notes || null
                };

                const response = await apiClient.post('/vendor/invoices', payload);

                this.showCreateModal = false;
                this.successMessage = `Invoice ${response.invoice_number} created successfully`;
                await this.loadStats();
                await this.loadInvoices();
            } catch (error) {
                invoicesLog.error('[VENDOR INVOICES] Failed to create invoice:', error);
                this.error = error.message || 'Failed to create invoice';
            } finally {
                this.creatingInvoice = false;
                setTimeout(() => this.successMessage = '', 5000);
            }
        },

        /**
         * Update invoice status
         */
        async updateStatus(invoice, newStatus) {
            const statusLabels = {
                'issued': 'mark as issued',
                'paid': 'mark as paid',
                'cancelled': 'cancel'
            };

            if (!confirm(`Are you sure you want to ${statusLabels[newStatus] || newStatus} this invoice?`)) {
                return;
            }

            try {
                await apiClient.put(`/vendor/invoices/${invoice.id}/status`, {
                    status: newStatus
                });

                this.successMessage = `Invoice ${invoice.invoice_number} status updated to ${newStatus}`;
                await this.loadStats();
                await this.loadInvoices();
            } catch (error) {
                invoicesLog.error('[VENDOR INVOICES] Failed to update status:', error);
                this.error = error.message || 'Failed to update invoice status';
            }
            setTimeout(() => this.successMessage = '', 5000);
        },

        /**
         * Download invoice PDF
         */
        async downloadPDF(invoice) {
            this.downloadingPdf = true;

            try {
                // Get the token for authentication
                const token = localStorage.getItem('wizamart_token') || localStorage.getItem('vendor_token');
                if (!token) {
                    throw new Error('Not authenticated');
                }

                const response = await fetch(`/api/v1/vendor/invoices/${invoice.id}/pdf`, {
                    method: 'GET',
                    headers: {
                        'Authorization': `Bearer ${token}`
                    }
                });

                if (!response.ok) {
                    const errorData = await response.json().catch(() => ({}));
                    throw new Error(errorData.detail || 'Failed to download PDF');
                }

                // Get filename from Content-Disposition header
                const contentDisposition = response.headers.get('Content-Disposition');
                let filename = `invoice-${invoice.invoice_number}.pdf`;
                if (contentDisposition) {
                    const match = contentDisposition.match(/filename="(.+)"/);
                    if (match) {
                        filename = match[1];
                    }
                }

                // Download the file
                const blob = await response.blob();
                const url = window.URL.createObjectURL(blob);
                const link = document.createElement('a');
                link.href = url;
                link.download = filename;
                document.body.appendChild(link);
                link.click();
                document.body.removeChild(link);
                window.URL.revokeObjectURL(url);

                this.successMessage = `Downloaded: ${filename}`;
            } catch (error) {
                invoicesLog.error('[VENDOR INVOICES] Failed to download PDF:', error);
                this.error = error.message || 'Failed to download PDF';
            } finally {
                this.downloadingPdf = false;
                setTimeout(() => this.successMessage = '', 5000);
            }
        },

        /**
         * Format date for display
         */
        formatDate(dateStr) {
            if (!dateStr) return 'N/A';
            const date = new Date(dateStr);
            return date.toLocaleDateString('en-GB', {
                day: '2-digit',
                month: 'short',
                year: 'numeric'
            });
        },

        /**
         * Format currency for display
         */
        formatCurrency(cents, currency = 'EUR') {
            if (cents === null || cents === undefined) return 'N/A';
            const amount = cents / 100;
            return new Intl.NumberFormat('de-LU', {
                style: 'currency',
                currency: currency
            }).format(amount);
        }
    };
}