{% extends 'base.html' %}
{% load static %}

{% block title %}{{ vorlage.bezeichnung }} – Vorlage bearbeiten{% endblock %}

{% block extra_css %}
<!-- Summernote WYSIWYG (lokal) -->
<link rel="stylesheet" href="{% static 'stiftung/vendor/summernote/summernote-bs5.min.css' %}">
<style>
    .preview-frame {
        width: 100%;
        height: 75vh;
        border: 1px solid #dee2e6;
        border-radius: 4px;
        background: #fff;
    }
    .var-list {
        max-height: 55vh;
        overflow-y: auto;
    }
    .var-item {
        cursor: pointer;
        font-family: monospace;
        font-size: 12px;
    }
    .var-item:hover {
        background-color: #e9ecef;
    }
    .note-editor.note-frame {
        border-radius: 4px;
    }
    .code-editor-textarea {
        width: 100%;
        height: 70vh;
        font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
        font-size: 13px;
        line-height: 1.5;
        padding: 12px;
        border: 1px solid #dee2e6;
        border-radius: 4px;
        resize: vertical;
        tab-size: 4;
        white-space: pre;
        overflow-wrap: normal;
        overflow-x: auto;
        background: #f8f9fa;
    }
    .code-editor-textarea:focus {
        outline: none;
        border-color: #86b7fe;
        box-shadow: 0 0 0 .25rem rgba(13,110,253,.25);
    }
    #tab-vorschau .preview-loading {
        text-align: center;
        padding: 80px 0;
        color: #6c757d;
    }
</style>
{% endblock %}

{% block content %}
<div class="row">
    <div class="col-12">
        <div class="d-sm-flex align-items-center justify-content-between mb-3">
            <div>
                <h1 class="h3 mb-0 text-gray-800">
                    <i class="fas fa-file-code me-2"></i>{{ vorlage.bezeichnung }}
                </h1>
                <small class="text-muted"><code>{{ vorlage.schluessel }}</code> &nbsp;·&nbsp;
                    Kategorie: {{ vorlage.get_kategorie_display }}</small>
            </div>
            <div class="d-flex gap-2">
                <a href="{% url 'stiftung:vorlagen_liste' %}" class="btn btn-sm btn-outline-secondary">
                    <i class="fas fa-arrow-left me-1"></i>Zurück
                </a>
                {% if hat_original %}
                <form method="post" action="{% url 'stiftung:vorlage_zuruecksetzen' pk=vorlage.pk %}"
                      onsubmit="return confirm('Alle Änderungen verwerfen und auf Original zurücksetzen?')">
                    {% csrf_token %}
                    <button type="submit" class="btn btn-sm btn-outline-warning">
                        <i class="fas fa-undo me-1"></i>Original wiederherstellen
                    </button>
                </form>
                {% endif %}
            </div>
        </div>
    </div>
</div>

<!-- Tabs: Editor | Vorschau -->
<ul class="nav nav-tabs mb-3" role="tablist">
    <li class="nav-item">
        <button class="nav-link active" data-bs-toggle="tab" data-bs-target="#tab-editor" type="button" role="tab">
            <i class="fas fa-code me-1"></i>Editor
        </button>
    </li>
    <li class="nav-item">
        <button class="nav-link" data-bs-toggle="tab" data-bs-target="#tab-vorschau" type="button" role="tab" id="btn-tab-vorschau">
            <i class="fas fa-eye me-1"></i>Vorschau
        </button>
    </li>
    <li class="nav-item ms-auto">
        <button type="submit" form="editor-form" class="btn btn-sm btn-primary my-1">
            <i class="fas fa-save me-1"></i>Speichern
        </button>
    </li>
</ul>

<div class="tab-content">
    <!-- Editor Tab -->
    <div class="tab-pane fade show active" id="tab-editor" role="tabpanel">
        <div class="row">
            <div class="{% if variablen %}col-lg-9{% else %}col-12{% endif %}">
                <form method="post" id="editor-form">
                    {% csrf_token %}
                    <textarea name="html_inhalt" id="code-editor"{% if use_code_editor %} class="code-editor-textarea"{% endif %}>{{ vorlage.html_inhalt }}</textarea>
                    <script type="application/json" id="vorlage-html-inhalt">{{ html_inhalt_json }}</script>
                </form>
            </div>
            {% if variablen %}
            <div class="col-lg-3">
                <div class="card shadow mb-3">
                    <div class="card-header py-2">
                        <h6 class="m-0 fw-bold text-primary small">
                            <i class="fas fa-code me-1"></i>Variablen
                        </h6>
                        <small class="text-muted">Klick zum Einfügen</small>
                    </div>
                    <div class="card-body p-0">
                        <div class="var-list">
                            <table class="table table-sm mb-0">
                                <tbody>
                                    {% for var, beschreibung in variablen.items %}
                                    <tr class="var-item" data-var="{{ var }}">
                                        <td class="ps-3 py-1">
                                            <code>{% templatetag openvariable %} {{ var }} {% templatetag closevariable %}</code>
                                        </td>
                                        <td class="pe-3 py-1 text-muted small">{{ beschreibung }}</td>
                                    </tr>
                                    {% endfor %}
                                </tbody>
                            </table>
                        </div>
                    </div>
                </div>
                <div class="card shadow">
                    <div class="card-header py-2">
                        <h6 class="m-0 fw-bold text-secondary small">
                            <i class="fas fa-info-circle me-1"></i>Info
                        </h6>
                    </div>
                    <div class="card-body small">
                        <dl class="mb-0">
                            <dt>Zuletzt bearbeitet</dt>
                            <dd class="text-muted">{{ vorlage.zuletzt_bearbeitet_am|date:"d.m.Y H:i" }}</dd>
                            {% if vorlage.zuletzt_bearbeitet_von %}
                            <dt>Bearbeitet von</dt>
                            <dd class="text-muted">{{ vorlage.zuletzt_bearbeitet_von.get_full_name|default:vorlage.zuletzt_bearbeitet_von.username }}</dd>
                            {% endif %}
                            <dt>Erstellt am</dt>
                            <dd class="text-muted mb-0">{{ vorlage.erstellt_am|date:"d.m.Y" }}</dd>
                        </dl>
                    </div>
                </div>
            </div>
            {% endif %}
        </div>
    </div>

    <!-- Vorschau Tab -->
    <div class="tab-pane fade" id="tab-vorschau" role="tabpanel">
        <div class="preview-loading" id="preview-loading">
            <i class="fas fa-spinner fa-spin fa-2x mb-2 d-block"></i>
            Vorschau wird geladen...
        </div>
        <iframe id="preview-frame" class="preview-frame" title="Vorschau" style="display:none"></iframe>
    </div>
</div>
{% endblock %}

{% block javascript %}
<!-- jQuery (lokal) -->
<script src="{% static 'stiftung/vendor/jquery/jquery.min.js' %}"></script>
<!-- Summernote WYSIWYG (lokal) -->
<script src="{% static 'stiftung/vendor/summernote/summernote-bs5.min.js' %}"></script>
<script src="{% static 'stiftung/vendor/summernote/summernote-de-DE.min.js' %}"></script>
<script>
(function() {
    var initialContent;
    try {
        initialContent = JSON.parse(document.getElementById('vorlage-html-inhalt').textContent);
    } catch(e) {
        initialContent = null;
    }

    var useCodeEditor = {{ use_code_editor|yesno:"true,false" }};
    var editor = document.getElementById('code-editor');
    var summernoteActive = false;

    // Returns current HTML content regardless of editor mode
    function getEditorContent() {
        if (summernoteActive) {
            return $('#code-editor').summernote('code');
        }
        return editor.value;
    }

    // ---- Editor setup ----
    if (useCodeEditor) {
        // Plain textarea for full HTML documents (Serienbrief)
        if (initialContent) {
            editor.value = initialContent;
        }
        editor.addEventListener('keydown', function(e) {
            if (e.key === 'Tab') {
                e.preventDefault();
                var start = this.selectionStart;
                var end = this.selectionEnd;
                this.value = this.value.substring(0, start) + '    ' + this.value.substring(end);
                this.selectionStart = this.selectionEnd = start + 4;
            }
        });
        // Variable insertion for code editor
        document.querySelectorAll('.var-item').forEach(function(row) {
            row.addEventListener('click', function() {
                var varName = this.getAttribute('data-var');
                var placeholder = String.fromCharCode(123,123) + ' ' + varName + ' ' + String.fromCharCode(125,125);
                var start = editor.selectionStart;
                editor.value = editor.value.substring(0, start) + placeholder + editor.value.substring(editor.selectionEnd);
                editor.selectionStart = editor.selectionEnd = start + placeholder.length;
                editor.focus();
            });
        });
    } else if (typeof $ !== 'undefined' && typeof $.fn.summernote !== 'undefined') {
        // Summernote WYSIWYG for HTML fragment templates
        $('#code-editor').summernote({
            lang: 'de-DE',
            height: 520,
            toolbar: [
                ['style', ['bold', 'italic', 'underline', 'strikethrough', 'clear']],
                ['para', ['style', 'ul', 'ol', 'paragraph']],
                ['table', ['table']],
                ['insert', ['link', 'hr']],
                ['view', ['fullscreen', 'codeview', 'undo', 'redo']],
            ],
            callbacks: {
                onInit: function() {
                    if (initialContent) {
                        $('#code-editor').summernote('code', initialContent);
                    }
                }
            }
        });
        summernoteActive = true;

        // Variable insertion for Summernote
        document.querySelectorAll('.var-item').forEach(function(row) {
            row.addEventListener('click', function() {
                var varName = this.getAttribute('data-var');
                var placeholder = String.fromCharCode(123,123) + ' ' + varName + ' ' + String.fromCharCode(125,125);
                $('#code-editor').summernote('focus');
                $('#code-editor').summernote('insertText', placeholder);
            });
        });

        // Sync Summernote to textarea on form submit
        document.getElementById('editor-form').addEventListener('submit', function() {
            document.querySelector('textarea[name=html_inhalt]').value = getEditorContent();
        });
    } else {
        // Fallback: Summernote not loaded — style textarea as code editor
        if (editor) {
            editor.style.height = '70vh';
            editor.style.fontFamily = "'SFMono-Regular', Consolas, monospace";
            editor.style.fontSize = '13px';
            editor.style.padding = '12px';
            editor.style.background = '#f8f9fa';
        }
        if (initialContent) {
            editor.value = initialContent;
        }
        // Variable insertion for plain textarea fallback
        document.querySelectorAll('.var-item').forEach(function(row) {
            row.addEventListener('click', function() {
                var varName = this.getAttribute('data-var');
                var placeholder = String.fromCharCode(123,123) + ' ' + varName + ' ' + String.fromCharCode(125,125);
                var start = editor.selectionStart;
                editor.value = editor.value.substring(0, start) + placeholder + editor.value.substring(editor.selectionEnd);
                editor.selectionStart = editor.selectionEnd = start + placeholder.length;
                editor.focus();
            });
        });
    }

    // ---- Preview (always set up, independent of editor mode) ----
    var previewFrame = document.getElementById('preview-frame');
    var previewLoading = document.getElementById('preview-loading');

    function loadPreview() {
        var content = getEditorContent();
        var csrfEl = document.querySelector('[name=csrfmiddlewaretoken]');
        if (!csrfEl) {
            previewLoading.innerHTML = '<i class="fas fa-exclamation-triangle text-danger fa-2x mb-2 d-block"></i>CSRF-Token nicht gefunden.';
            return;
        }
        var formData = new FormData();
        formData.append('html_inhalt', content);
        formData.append('csrfmiddlewaretoken', csrfEl.value);

        previewLoading.style.display = 'block';
        previewFrame.style.display = 'none';

        fetch('{% url "stiftung:vorlage_vorschau" pk=vorlage.pk %}', {
            method: 'POST',
            body: formData,
            credentials: 'same-origin',
        })
        .then(function(r) {
            if (!r.ok) throw new Error('HTTP ' + r.status);
            return r.text();
        })
        .then(function(html) {
            previewFrame.srcdoc = html;
            previewFrame.style.display = 'block';
            previewLoading.style.display = 'none';
        })
        .catch(function(err) {
            previewLoading.innerHTML = '<i class="fas fa-exclamation-triangle text-danger fa-2x mb-2 d-block"></i>Vorschau fehlgeschlagen: ' + err;
        });
    }

    // Load preview when clicking the Vorschau tab (direct click — more reliable than Bootstrap tab events)
    document.getElementById('btn-tab-vorschau').addEventListener('click', function() {
        // Small delay so the tab pane is visible before we load
        setTimeout(loadPreview, 100);
    });
})();
</script>
{% endblock %}