{% extends "base.html" %}
{% from "components/ui.html" import page_header %}

{% block content %}
{% set breadcrumbs = [
    {'text': 'Admin', 'url': url_for('admin.admin_dashboard')},
    {'text': 'Email Templates', 'url': url_for('admin.list_email_templates')},
    {'text': template.name}
] %}

{{ page_header(
    icon_class='fas fa-envelope',
    title_text='Edit Email Template',
    subtitle_text=template.name,
    breadcrumbs=breadcrumbs
) }}

<div class="bg-card-light dark:bg-card-dark p-6 rounded-lg shadow">
    <form method="POST" id="emailTemplateForm" class="space-y-6">
        <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
        
        <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
            <div class="md:col-span-2">
                <label for="name" class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Template Name *</label>
                <input type="text" id="name" name="name" required value="{{ template.name }}" class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-800 text-gray-900 dark:text-gray-100">
            </div>
            
            <div class="md:col-span-2">
                <label for="description" class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Description</label>
                <input type="text" id="description" name="description" value="{{ template.description or '' }}" class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-800 text-gray-900 dark:text-gray-100">
            </div>
            
            <div class="md:col-span-2">
                <label class="flex items-center">
                    <input type="checkbox" name="is_default" {% if template.is_default %}checked{% endif %} class="rounded border-gray-300 text-primary focus:ring-primary">
                    <span class="ml-2 text-sm text-gray-700 dark:text-gray-300">{{ _('Set as default template') }}</span>
                </label>
            </div>
        </div>

        <!-- Visual Editor Section -->
        <div class="mt-6">
            <div class="flex items-center justify-between mb-4">
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300">{{ _('HTML Template') }} *</label>
                <div class="flex gap-2" id="variableButtons">
                    <button type="button" data-variable="invoice.invoice_number" class="variable-btn px-3 py-1 text-xs bg-blue-100 dark:bg-blue-900 text-blue-700 dark:text-blue-300 rounded hover:bg-blue-200 dark:hover:bg-blue-800">
                        {{ _('Invoice Number') }}
                    </button>
                    <button type="button" data-variable="company_name" class="variable-btn px-3 py-1 text-xs bg-blue-100 dark:bg-blue-900 text-blue-700 dark:text-blue-300 rounded hover:bg-blue-200 dark:hover:bg-blue-800">
                        {{ _('Company Name') }}
                    </button>
                    <button type="button" data-variable="custom_message" class="variable-btn px-3 py-1 text-xs bg-blue-100 dark:bg-blue-900 text-blue-700 dark:text-blue-300 rounded hover:bg-blue-200 dark:hover:bg-blue-800">
                        {{ _('Custom Message') }}
                    </button>
                    <button type="button" id="showAllVariablesBtn" class="px-3 py-1 text-xs bg-gray-100 dark:bg-gray-700 text-gray-700 dark:text-gray-300 rounded hover:bg-gray-200 dark:hover:bg-gray-600">
                        {{ _('More Variables') }}
                    </button>
                </div>
            </div>
            
            <!-- Split View: Editor and Preview -->
            <div class="grid grid-cols-1 lg:grid-cols-2 gap-4">
                <!-- Editor Column -->
                <div class="border border-gray-300 dark:border-gray-600 rounded-lg overflow-hidden">
                    <div class="bg-gray-100 dark:bg-gray-700 px-4 py-2 border-b border-gray-300 dark:border-gray-600 flex items-center justify-between">
                        <span class="text-sm font-medium text-gray-700 dark:text-gray-300">Editor</span>
                        <div class="flex gap-2">
                            <button type="button" id="viewModeBtn" class="px-2 py-1 text-xs bg-white dark:bg-gray-800 text-gray-700 dark:text-gray-300 rounded hover:bg-gray-200 dark:hover:bg-gray-600">
                                <i class="fas fa-code mr-1"></i>Code
                            </button>
                            <button type="button" id="updatePreviewBtn" class="px-2 py-1 text-xs bg-blue-500 text-white rounded hover:bg-blue-600">
                                <i class="fas fa-sync mr-1"></i>Preview
                            </button>
                        </div>
                    </div>
                    <div id="html_editor" style="min-height: 500px;"></div>
                    <textarea id="html" name="html" required style="display: none;">{{ template.html or '' }}</textarea>
                </div>
                
                <!-- Preview Column -->
                <div class="border border-gray-300 dark:border-gray-600 rounded-lg overflow-hidden">
                    <div class="bg-gray-100 dark:bg-gray-700 px-4 py-2 border-b border-gray-300 dark:border-gray-600 flex items-center justify-between">
                        <span class="text-sm font-medium text-gray-700 dark:text-gray-300">Live Preview</span>
                        <button type="button" id="refreshPreviewBtn" class="px-2 py-1 text-xs bg-green-500 text-white rounded hover:bg-green-600">
                            <i class="fas fa-refresh mr-1"></i>Refresh
                        </button>
                    </div>
                    <div id="email_preview" class="p-4 bg-white dark:bg-gray-800 overflow-auto" style="min-height: 500px; max-height: 500px;">
                        <div class="text-gray-500 dark:text-gray-400 text-center py-8">
                            <i class="fas fa-eye-slash text-4xl mb-2"></i>
                            <p>Preview will appear here</p>
                        </div>
                    </div>
                </div>
            </div>
            
            <p class="text-xs text-gray-500 dark:text-gray-400 mt-2">
                Use Jinja2 syntax for variables: <code>{{ '{{ invoice.invoice_number }}' }}</code>, <code>{{ '{{ company_name }}' }}</code>, <code>{{ '{{ custom_message }}' }}</code>
            </p>
        </div>
        
        <!-- CSS Editor Section -->
        <div class="mt-6">
            <div class="flex items-center justify-between mb-2">
                <label for="css" class="block text-sm font-medium text-gray-700 dark:text-gray-300">CSS Styles (Optional)</label>
                <button type="button" id="applyCssBtn" class="px-2 py-1 text-xs bg-green-500 text-white rounded hover:bg-green-600">
                    <i class="fas fa-refresh mr-1"></i>Apply CSS
                </button>
            </div>
            <textarea id="css" name="css" rows="10" class="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-800 text-gray-900 dark:text-gray-100 font-mono text-sm">{{ template.css or '' }}</textarea>
            <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">CSS styles for the email template. Will be automatically wrapped in &lt;style&gt; tags.</p>
        </div>
        
        <div class="flex justify-end gap-3 pt-4 border-t border-gray-300 dark:border-gray-600">
            <a href="{{ url_for('admin.list_email_templates') }}" class="px-4 py-2 bg-gray-300 dark:bg-gray-600 text-gray-700 dark:text-gray-200 rounded-lg hover:bg-gray-400 dark:hover:bg-gray-500">{{ _('Cancel') }}</a>
            <button type="submit" class="px-4 py-2 bg-primary text-white rounded-lg hover:bg-primary/90">{{ _('Update Template') }}</button>
        </div>
    </form>
</div>

<!-- Variable Reference Modal -->
<div id="variablesModal" class="hidden fixed inset-0 bg-gray-600 bg-opacity-50 overflow-y-auto h-full w-full z-50">
    <div class="relative top-20 mx-auto p-5 border w-11/12 max-w-2xl shadow-lg rounded-md bg-white dark:bg-gray-800">
        <div class="flex justify-between items-center mb-4">
            <h3 class="text-lg font-medium text-gray-900 dark:text-gray-100">{{ _('Available Variables') }}</h3>
            <button id="closeVariablesModalBtn" class="text-gray-400 hover:text-gray-600 dark:hover:text-gray-300">
                <i class="fas fa-times"></i>
            </button>
        </div>
        <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div>
                <h4 class="font-semibold text-sm mb-2 text-gray-700 dark:text-gray-300">{{ _('Invoice Variables') }}</h4>
                <div class="space-y-1">
                    <button data-variable="invoice.invoice_number" class="modal-variable-btn w-full text-left px-3 py-2 text-sm bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded">
                        <code>{{ '{{ invoice.invoice_number }}' }}</code>
                    </button>
                    <button data-variable="invoice.issue_date" class="modal-variable-btn w-full text-left px-3 py-2 text-sm bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded">
                        <code>{{ '{{ invoice.issue_date }}' }}</code>
                    </button>
                    <button data-variable="invoice.due_date" class="modal-variable-btn w-full text-left px-3 py-2 text-sm bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded">
                        <code>{{ '{{ invoice.due_date }}' }}</code>
                    </button>
                    <button data-variable="invoice.total_amount" class="modal-variable-btn w-full text-left px-3 py-2 text-sm bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded">
                        <code>{{ '{{ invoice.total_amount }}' }}</code>
                    </button>
                    <button data-variable="invoice.currency_code" class="modal-variable-btn w-full text-left px-3 py-2 text-sm bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded">
                        <code>{{ '{{ invoice.currency_code }}' }}</code>
                    </button>
                    <button data-variable="invoice.client_name" class="modal-variable-btn w-full text-left px-3 py-2 text-sm bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded">
                        <code>{{ '{{ invoice.client_name }}' }}</code>
                    </button>
                </div>
            </div>
            <div>
                <h4 class="font-semibold text-sm mb-2 text-gray-700 dark:text-gray-300">{{ _('Other Variables') }}</h4>
                <div class="space-y-1">
                    <button data-variable="company_name" class="modal-variable-btn w-full text-left px-3 py-2 text-sm bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded">
                        <code>{{ '{{ company_name }}' }}</code>
                    </button>
                    <button data-variable="custom_message" class="modal-variable-btn w-full text-left px-3 py-2 text-sm bg-gray-100 dark:bg-gray-700 hover:bg-gray-200 dark:hover:bg-gray-600 rounded">
                        <code>{{ '{{ custom_message }}' }}</code>
                    </button>
                </div>
            </div>
        </div>
        <div class="mt-4 flex justify-end">
            <button id="closeVariablesModalBtn2" class="px-4 py-2 bg-gray-300 dark:bg-gray-600 text-gray-700 dark:text-gray-200 rounded-lg hover:bg-gray-400 dark:hover:bg-gray-500">Close</button>
        </div>
    </div>
</div>

{% endblock %}

{% block extra_css %}
<link rel="stylesheet" href="https://uicdn.toast.com/editor/latest/toastui-editor.min.css">
<link rel="stylesheet" href="https://uicdn.toast.com/editor/latest/theme/toastui-editor-dark.css">
<style>
#email_preview {
    font-family: Arial, sans-serif;
}
#email_preview img {
    max-width: 100%;
    height: auto;
}
</style>
{% endblock %}

{% block scripts_extra %}
<script src="https://uicdn.toast.com/editor/latest/toastui-editor-all.min.js"></script>
<script>
let htmlEditor = null;
let isCodeMode = false;
let originalHtml = {{ (template.html or '') | tojson }};

// Wait for DOM and Toast UI Editor to be ready
function initEditor() {
    console.log('initEditor called');
    const htmlTextarea = document.getElementById('html');
    const editorContainer = document.getElementById('html_editor');
    
    console.log('htmlTextarea:', htmlTextarea);
    console.log('editorContainer:', editorContainer);
    
    if (!editorContainer) {
        console.error('Editor container not found');
        return;
    }
    
    if (!window.toastui || !window.toastui.Editor) {
        console.error('Toast UI Editor not loaded');
        // Fallback to textarea
        editorContainer.innerHTML = '<textarea id="html_fallback" name="html" class="w-full h-full p-4 font-mono text-sm border border-gray-300 dark:border-gray-600 rounded" style="min-height: 500px;">' + (originalHtml || '') + '</textarea>';
        const fallbackTextarea = document.getElementById('html_fallback');
        if (fallbackTextarea && htmlTextarea) {
            fallbackTextarea.addEventListener('input', function() {
                htmlTextarea.value = this.value;
                updatePreview();
            });
        }
        setupEventListeners();
        return;
    }
    
    try {
        const theme = document.documentElement.classList.contains('dark') ? 'dark' : 'light';
        
        htmlEditor = new toastui.Editor({
            el: editorContainer,
            height: '500px',
            initialEditType: 'wysiwyg',
            previewStyle: 'vertical',
            usageStatistics: false,
            theme: theme,
            toolbarItems: [
                ['heading', 'bold', 'italic', 'strike'],
                ['hr', 'quote'],
                ['ul', 'ol', 'task'],
                ['link', 'code', 'codeblock', 'table'],
                ['image'],
                ['scrollSync']
            ],
            initialValue: originalHtml || ''
        });
        
        // Update hidden textarea on form submit
        const emailTemplateForm = document.getElementById('emailTemplateForm');
        if (emailTemplateForm) {
            emailTemplateForm.addEventListener('submit', function() {
                if (htmlEditor) {
                    try {
                        htmlTextarea.value = htmlEditor.getHTML();
                    } catch (e) {
                        htmlTextarea.value = htmlEditor.getMarkdown();
                    }
                }
            });
        }
        
        // Auto-update preview on content change
        htmlEditor.on('change', function() {
            clearTimeout(window.previewTimeout);
            window.previewTimeout = setTimeout(updatePreview, 500);
        });
        
        // Initial preview after a short delay
        setTimeout(updatePreview, 300);
        
        setupEventListeners();
    } catch (error) {
        console.error('Error initializing editor:', error);
        initializeFallback();
    }
}

function initializeFallback() {
    const editorContainer = document.getElementById('html_editor');
    const htmlTextarea = document.getElementById('html');
    if (editorContainer && htmlTextarea) {
        editorContainer.innerHTML = '<textarea id="html_fallback" name="html" class="w-full h-full p-4 font-mono text-sm border border-gray-300 dark:border-gray-600 rounded" style="min-height: 500px;">' + (originalHtml || '') + '</textarea>';
        const fallbackTextarea = document.getElementById('html_fallback');
        if (fallbackTextarea) {
            fallbackTextarea.addEventListener('input', function() {
                htmlTextarea.value = this.value;
                updatePreview();
            });
        }
        setupEventListeners();
    }
}

function setupEventListeners() {
    // CSS editor change handler
    const cssTextarea = document.getElementById('css');
    if (cssTextarea) {
        cssTextarea.addEventListener('input', function() {
            clearTimeout(window.previewTimeout);
            window.previewTimeout = setTimeout(updatePreview, 500);
        });
    }
    
    // Set up event listeners for variable buttons
    document.querySelectorAll('.variable-btn').forEach(btn => {
        btn.addEventListener('click', function() {
            const varName = this.getAttribute('data-variable');
            insertVariable(varName);
        });
    });
    
    const showAllVariablesBtn = document.getElementById('showAllVariablesBtn');
    if (showAllVariablesBtn) {
        showAllVariablesBtn.addEventListener('click', showAllVariables);
    }
    
    const closeVariablesModalBtn = document.getElementById('closeVariablesModalBtn');
    if (closeVariablesModalBtn) {
        closeVariablesModalBtn.addEventListener('click', closeVariablesModal);
    }
    
    const closeVariablesModalBtn2 = document.getElementById('closeVariablesModalBtn2');
    if (closeVariablesModalBtn2) {
        closeVariablesModalBtn2.addEventListener('click', closeVariablesModal);
    }
    
    document.querySelectorAll('.modal-variable-btn').forEach(btn => {
        btn.addEventListener('click', function() {
            const varName = this.getAttribute('data-variable');
            insertVariable(varName);
            closeVariablesModal();
        });
    });
    
    // Set up event listeners for preview and view mode buttons
    const viewModeBtn = document.getElementById('viewModeBtn');
    if (viewModeBtn) {
        viewModeBtn.addEventListener('click', toggleViewMode);
    }
    
    const updatePreviewBtn = document.getElementById('updatePreviewBtn');
    if (updatePreviewBtn) {
        updatePreviewBtn.addEventListener('click', updatePreview);
    }
    
    const refreshPreviewBtn = document.getElementById('refreshPreviewBtn');
    if (refreshPreviewBtn) {
        refreshPreviewBtn.addEventListener('click', updatePreview);
    }
    
    const applyCssBtn = document.getElementById('applyCssBtn');
    if (applyCssBtn) {
        applyCssBtn.addEventListener('click', updatePreview);
    }
}

function toggleViewMode() {
    if (!htmlEditor) return;
    
    isCodeMode = !isCodeMode;
    const btn = document.getElementById('viewModeBtn');
    
    if (isCodeMode) {
        htmlEditor.changeMode('markdown');
        btn.innerHTML = '<i class="fas fa-eye mr-1"></i>Visual';
    } else {
        htmlEditor.changeMode('wysiwyg');
        btn.innerHTML = '<i class="fas fa-code mr-1"></i>Code';
    }
}

function insertVariable(varName) {
    if (!htmlEditor) {
        const textarea = document.getElementById('html_fallback') || document.getElementById('html');
        if (textarea) {
            const cursorPos = textarea.selectionStart || textarea.value.length;
            const textBefore = textarea.value.substring(0, cursorPos);
            const textAfter = textarea.value.substring(cursorPos);
            const variable = '{{ ' + varName + ' }}';
            textarea.value = textBefore + variable + textAfter;
            textarea.focus();
            textarea.setSelectionRange(cursorPos + variable.length, cursorPos + variable.length);
            updatePreview();
        }
        return;
    }
    
    const variable = '{{ ' + varName + ' }}';
    
    try {
        if (isCodeMode || htmlEditor.getCurrentMode() === 'markdown') {
            htmlEditor.insertText(variable);
        } else {
            htmlEditor.insertText(variable);
        }
        updatePreview();
    } catch (e) {
        console.error('Error inserting variable:', e);
    }
}

function showAllVariables() {
    const modal = document.getElementById('variablesModal');
    if (modal) {
        modal.classList.remove('hidden');
    }
}

function closeVariablesModal() {
    const modal = document.getElementById('variablesModal');
    if (modal) {
        modal.classList.add('hidden');
    }
}

function updatePreview() {
    if (!htmlEditor) {
        const textarea = document.getElementById('html_fallback') || document.getElementById('html');
        if (textarea) {
            updatePreviewContent(textarea.value);
        }
        return;
    }
    
    let htmlContent = '';
    try {
        htmlContent = htmlEditor.getHTML();
    } catch (e) {
        try {
            htmlContent = htmlEditor.getMarkdown();
        } catch (e2) {
            console.error('Error getting editor content:', e2);
            return;
        }
    }
    
    updatePreviewContent(htmlContent);
}

function updatePreviewContent(htmlContent) {
    const previewDiv = document.getElementById('email_preview');
    const cssTextarea = document.getElementById('css');
    const cssContent = cssTextarea ? cssTextarea.value : '';
    
    if (!previewDiv) {
        console.error('Preview div not found');
        return;
    }
    
    // Create a complete HTML document with CSS
    let fullHtml = '<!DOCTYPE html><html><head><meta charset="UTF-8">';
    if (cssContent) {
        fullHtml += '<style>' + cssContent + '</style>';
    }
    fullHtml += '</head><body>';
    
    // Replace Jinja2 variables with sample data for preview
    htmlContent = (htmlContent || '')
        .replace(/\{\{\s*invoice\.invoice_number\s*\}\}/g, 'INV-2024-001')
        .replace(/\{\{\s*invoice\.issue_date\s*\}\}/g, '2024-01-15')
        .replace(/\{\{\s*invoice\.due_date\s*\}\}/g, '2024-02-15')
        .replace(/\{\{\s*invoice\.total_amount\s*\}\}/g, '1,200.00')
        .replace(/\{\{\s*invoice\.currency_code\s*\}\}/g, 'EUR')
        .replace(/\{\{\s*invoice\.client_name\s*\}\}/g, 'Sample Client')
        .replace(/\{\{\s*company_name\s*\}\}/g, 'Your Company Name')
        .replace(/\{\{\s*custom_message\s*\}\}/g, 'Thank you for your business!');
    
    fullHtml += htmlContent;
    fullHtml += '</body></html>';
    
    // Create iframe for safe preview
    previewDiv.innerHTML = '<iframe id="preview_iframe" style="width: 100%; height: 100%; border: none;"></iframe>';
    const iframe = document.getElementById('preview_iframe');
    if (iframe) {
        try {
            iframe.contentDocument.open();
            iframe.contentDocument.write(fullHtml);
            iframe.contentDocument.close();
        } catch (e) {
            console.error('Error writing to iframe:', e);
            previewDiv.innerHTML = '<div class="text-red-500 p-4">Preview unavailable. Please check browser console.</div>';
        }
    }
}

// Close modal on outside click
document.addEventListener('click', function(event) {
    const modal = document.getElementById('variablesModal');
    if (event.target == modal) {
        closeVariablesModal();
    }
});

// Initialize when DOM and Toast UI Editor are ready
function waitForEditorAndInit() {
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', function() {
            checkEditorAndInit();
        });
    } else {
        checkEditorAndInit();
    }
}

function checkEditorAndInit() {
    console.log('checkEditorAndInit called');
    console.log('window.toastui:', window.toastui);
    console.log('document.readyState:', document.readyState);
    
    // Check if Toast UI Editor is loaded
    if (window.toastui && window.toastui.Editor) {
        console.log('Toast UI Editor found, initializing...');
        setTimeout(initEditor, 50);
    } else {
        console.log('Toast UI Editor not found, waiting...');
        // Wait a bit and try again
        setTimeout(function() {
            if (window.toastui && window.toastui.Editor) {
                console.log('Toast UI Editor found after wait, initializing...');
                initEditor();
            } else {
                console.warn('Toast UI Editor not loaded, using fallback');
                initEditor(); // Will use fallback
            }
        }, 500);
    }
}

waitForEditorAndInit();
</script>
{% endblock %}