/**
 * Email Templates Management Page
 *
 * Handles:
 * - Listing all platform email templates
 * - Editing template content (all languages)
 * - Preview and test email sending
 */

const emailTemplatesLog = window.LogConfig?.createLogger?.('emailTemplates') ||
    { info: () => {}, debug: () => {}, warn: () => {}, error: () => {} };

function emailTemplatesPage() {
    return {
        // Inherit base layout functionality from init-alpine.js
        ...data(),

        // Set current page for navigation
        currentPage: 'email-templates',

        // Data
        loading: false,
        templates: [],
        categories: [],
        selectedCategory: null,

        // Edit Modal
        showEditModal: false,
        editingTemplate: null,
        editLanguage: 'en',
        loadingTemplate: false,
        editForm: {
            subject: '',
            body_html: '',
            body_text: '',
            variables: [],
            required_variables: []
        },
        saving: false,

        // Preview Modal
        showPreviewModal: false,
        previewData: null,

        // Test Email Modal
        showTestEmailModal: false,
        testEmailAddress: '',
        sendingTest: false,

        // Computed
        get filteredTemplates() {
            if (!this.selectedCategory) {
                return this.templates;
            }
            return this.templates.filter(t => t.category === this.selectedCategory);
        },

        // Lifecycle
        async init() {
            // Guard against duplicate initialization
            if (window._adminEmailTemplatesInitialized) return;
            window._adminEmailTemplatesInitialized = true;

            // Load i18n translations
            await I18n.loadModule('messaging');

            await this.loadData();
        },

        // Data Loading
        async loadData() {
            this.loading = true;
            try {
                const [templatesData, categoriesData] = await Promise.all([
                    apiClient.get('/admin/email-templates'),
                    apiClient.get('/admin/email-templates/categories')
                ]);

                this.templates = templatesData.templates || [];
                this.categories = categoriesData.categories || [];
            } catch (error) {
                emailTemplatesLog.error('Failed to load email templates:', error);
                Utils.showToast(I18n.t('messaging.messages.failed_to_load_templates'), 'error');
            } finally {
                this.loading = false;
            }
        },

        // Category styling
        getCategoryClass(category) {
            const classes = {
                'auth': 'bg-blue-100 dark:bg-blue-900 text-blue-800 dark:text-blue-200',
                'orders': 'bg-green-100 dark:bg-green-900 text-green-800 dark:text-green-200',
                'billing': 'bg-orange-100 dark:bg-orange-900 text-orange-800 dark:text-orange-200',
                'system': 'bg-purple-100 dark:bg-purple-900 text-purple-800 dark:text-purple-200',
                'marketing': 'bg-pink-100 dark:bg-pink-900 text-pink-800 dark:text-pink-200'
            };
            return classes[category] || 'bg-gray-100 dark:bg-gray-700 text-gray-800 dark:text-gray-200';
        },

        // Edit Template
        async editTemplate(template) {
            this.editingTemplate = template;
            this.editLanguage = 'en';
            this.showEditModal = true;
            await this.loadTemplateLanguage();
        },

        async loadTemplateLanguage() {
            if (!this.editingTemplate) return;

            this.loadingTemplate = true;
            try {
                const data = await apiClient.get(
                    `/admin/email-templates/${this.editingTemplate.code}/${this.editLanguage}`
                );

                this.editForm = {
                    subject: data.subject || '',
                    body_html: data.body_html || '',
                    body_text: data.body_text || '',
                    variables: data.variables || [],
                    required_variables: data.required_variables || []
                };
            } catch (error) {
                if (error.status === 404) {
                    // Template doesn't exist for this language yet
                    this.editForm = {
                        subject: '',
                        body_html: '',
                        body_text: '',
                        variables: [],
                        required_variables: []
                    };
                    Utils.showToast(I18n.t('messaging.messages.no_template_for_language', { language: this.editLanguage.toUpperCase() }), 'info');
                } else {
                    emailTemplatesLog.error('Failed to load template:', error);
                    Utils.showToast(I18n.t('messaging.messages.failed_to_load_template'), 'error');
                }
            } finally {
                this.loadingTemplate = false;
            }
        },

        closeEditModal() {
            this.showEditModal = false;
            this.editingTemplate = null;
            this.editForm = {
                subject: '',
                body_html: '',
                body_text: '',
                variables: [],
                required_variables: []
            };
        },

        async saveTemplate() {
            if (!this.editingTemplate) return;

            this.saving = true;
            try {
                await apiClient.put(
                    `/admin/email-templates/${this.editingTemplate.code}/${this.editLanguage}`,
                    {
                        subject: this.editForm.subject,
                        body_html: this.editForm.body_html,
                        body_text: this.editForm.body_text
                    }
                );

                Utils.showToast(I18n.t('messaging.messages.template_saved_successfully'), 'success');
                // Refresh templates list
                await this.loadData();
            } catch (error) {
                emailTemplatesLog.error('Failed to save template:', error);
                Utils.showToast(error.detail || I18n.t('messaging.messages.failed_to_save_template'), 'error');
            } finally {
                this.saving = false;
            }
        },

        // Preview
        async previewTemplate(template) {
            try {
                // Use sample variables for preview
                const sampleVariables = this.getSampleVariables(template.code);

                const data = await apiClient.post(
                    `/admin/email-templates/${template.code}/preview`,
                    {
                        template_code: template.code,
                        language: 'en',
                        variables: sampleVariables
                    }
                );

                this.previewData = data;
                this.showPreviewModal = true;
            } catch (error) {
                emailTemplatesLog.error('Failed to preview template:', error);
                Utils.showToast(I18n.t('messaging.messages.failed_to_load_preview'), 'error');
            }
        },

        getSampleVariables(templateCode) {
            // Sample variables for common templates
            const samples = {
                'signup_welcome': {
                    first_name: 'John',
                    merchant_name: 'Acme Corp',
                    email: 'john@example.com',
                    store_code: 'acme',
                    login_url: 'https://example.com/login',
                    trial_days: '14',
                    tier_name: 'Business'
                },
                'order_confirmation': {
                    customer_name: 'Jane Doe',
                    order_number: 'ORD-12345',
                    order_total: '99.99',
                    order_items_count: '3',
                    order_date: '2024-01-15',
                    shipping_address: '123 Main St, Luxembourg City, L-1234'
                },
                'password_reset': {
                    customer_name: 'John Doe',
                    reset_link: 'https://example.com/reset?token=abc123',
                    expiry_hours: '1'
                },
                'team_invite': {
                    invitee_name: 'Jane',
                    inviter_name: 'John',
                    store_name: 'Acme Corp',
                    role: 'Admin',
                    accept_url: 'https://example.com/accept',
                    expires_in_days: '7'
                }
            };
            return samples[templateCode] || { platform_name: 'Orion' };
        },

        // Test Email
        sendTestEmail() {
            this.showTestEmailModal = true;
        },

        async confirmSendTestEmail() {
            if (!this.testEmailAddress || !this.editingTemplate) return;

            this.sendingTest = true;
            try {
                const result = await apiClient.post(
                    `/admin/email-templates/${this.editingTemplate.code}/test`,
                    {
                        template_code: this.editingTemplate.code,
                        language: this.editLanguage,
                        to_email: this.testEmailAddress,
                        variables: this.getSampleVariables(this.editingTemplate.code)
                    }
                );

                if (result.success) {
                    Utils.showToast(I18n.t('messaging.messages.test_email_sent', { email: this.testEmailAddress }), 'success');
                    this.showTestEmailModal = false;
                    this.testEmailAddress = '';
                } else {
                    Utils.showToast(result.message || I18n.t('messaging.messages.failed_to_send_test_email'), 'error');
                }
            } catch (error) {
                emailTemplatesLog.error('Failed to send test email:', error);
                Utils.showToast(I18n.t('messaging.messages.failed_to_send_test_email'), 'error');
            } finally {
                this.sendingTest = false;
            }
        }
    };
}