@model Web.ViewModel.QuestionnaireVM.EditQuestionnaireViewModel
@{
    ViewData["Title"] = "Edit Questionnaire";
}
<style>
    @@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
    :root {
        --bg:#0f1923;--bg-card:#1a2332;--bg-elevated:#1f2b3d;--bg-input:#16202e;--bg-hover:#243044;
        --text-primary:#e8edf2;--text-secondary:#9ba8b9;--text-muted:#5e6e82;--text-faint:#3d4e63;
        --teal:#33b3ae;--teal-soft:rgba(51,179,174,0.1);--teal-medium:rgba(51,179,174,0.2);--teal-glow:rgba(51,179,174,0.12);--teal-dark:#2a9490;
        --amber:#f59e0b;--amber-soft:rgba(245,158,11,0.1);--amber-border:rgba(245,158,11,0.35);
        --purple:#7c3aed;--purple-soft:rgba(124,58,237,0.1);--purple-border:rgba(124,58,237,0.35);
        --red:#ef4444;--red-soft:rgba(239,68,68,0.1);
        --green:#10b981;--green-soft:rgba(16,185,129,0.1);--green-border:rgba(16,185,129,0.35);
        --border:rgba(255,255,255,0.06);--border-light:rgba(255,255,255,0.04);--border-focus:rgba(51,179,174,0.4);
        --shadow-xs:0 1px 3px rgba(0,0,0,0.2);--shadow-sm:0 2px 8px rgba(0,0,0,0.25);--shadow-md:0 4px 16px rgba(0,0,0,0.3);--shadow-lg:0 8px 32px rgba(0,0,0,0.35);--shadow-teal:0 4px 20px rgba(51,179,174,0.2);
        --radius-sm:8px;--radius-md:12px;--radius-lg:16px;
        --transition:all 0.2s cubic-bezier(0.4,0,0.2,1);--transition-spring:all 0.35s cubic-bezier(0.34,1.56,0.64,1);
    }
    @@keyframes slideUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
    @@keyframes scaleIn{from{opacity:0;transform:scale(0.96)}to{opacity:1;transform:scale(1)}}
    @@keyframes fadeIn{from{opacity:0}to{opacity:1}}
    @@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.08)}}
    *{box-sizing:border-box}
    .edit-page{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);min-height:100vh;padding:32px 40px 80px;-webkit-font-smoothing:antialiased;color:var(--text-primary)}
    .page-top{max-width:1280px;margin:0 auto 28px;animation:slideUp .5s ease both}
    .page-breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-muted);margin-bottom:16px}
    .page-breadcrumb a{color:var(--text-muted);text-decoration:none;transition:var(--transition)}
    .page-breadcrumb a:hover{color:var(--teal)}
    .page-breadcrumb .sep{color:var(--text-faint)}
    .page-title-row{display:flex;align-items:center;justify-content:space-between;gap:20px}
    .page-title{font-size:28px;font-weight:700;color:var(--text-primary);letter-spacing:-0.5px;margin:0}
    .page-title-accent{display:inline-block;width:8px;height:8px;background:var(--teal);border-radius:50%;margin-left:4px;vertical-align:super;animation:pulse 2s ease infinite}
    .question-counter-pill{display:flex;align-items:center;gap:8px;background:var(--bg-card);border:1px solid var(--border);border-radius:100px;padding:8px 20px;font-size:13px;font-weight:500;color:var(--text-secondary);box-shadow:var(--shadow-xs)}
    .counter-number{font-weight:700;font-size:18px;color:var(--teal);line-height:1}
    .meta-card{max-width:1280px;margin:0 auto 24px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 32px;box-shadow:var(--shadow-xs);animation:slideUp .5s ease .1s both;transition:var(--transition)}
    .meta-card:hover{box-shadow:var(--shadow-sm);border-color:rgba(255,255,255,0.08)}
    .meta-row{display:grid;grid-template-columns:1fr 1fr;gap:24px}
    .field-group label{display:block;font-size:13px;font-weight:600;color:var(--text-secondary);margin-bottom:8px;letter-spacing:-0.01em}
    .field-input{width:100%;background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:12px 16px;font-size:14px;font-family:inherit;color:var(--text-primary);transition:var(--transition);outline:none}
    .field-input::placeholder{color:var(--text-muted)}
    .field-input:focus{background:var(--bg-elevated);border-color:var(--border-focus);box-shadow:0 0 0 3px var(--teal-glow)}
    .builder-layout{max-width:1280px;margin:0 auto;display:flex;gap:24px;align-items:flex-start;animation:slideUp .5s ease .15s both}
    .palette{width:240px;min-width:240px;position:sticky;top:24px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;box-shadow:var(--shadow-xs);transition:var(--transition);max-height:calc(100vh - 48px);overflow-y:auto}
    .palette:hover{box-shadow:var(--shadow-sm)}
    .palette-title{font-size:11px;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;margin-bottom:14px}
    .palette-item{display:flex;align-items:center;gap:10px;padding:10px 12px;margin-bottom:4px;border-radius:var(--radius-sm);color:var(--text-secondary);font-size:13px;font-weight:500;cursor:grab;transition:var(--transition);user-select:none;border:1.5px solid transparent}
    .palette-item:hover{background:var(--teal-soft);color:var(--teal);border-color:var(--teal-medium);transform:translateX(4px)}
    .palette-item:active{cursor:grabbing;transform:scale(0.97)}
    .palette-item .p-icon{width:28px;height:28px;display:flex;align-items:center;justify-content:center;border-radius:6px;background:var(--bg-elevated);color:var(--teal);font-size:14px;flex-shrink:0;transition:var(--transition)}
    .palette-item:hover .p-icon{background:var(--teal);color:#fff}
    .palette::-webkit-scrollbar{width:4px}
    .palette::-webkit-scrollbar-track{background:transparent}
    .palette::-webkit-scrollbar-thumb{background:var(--text-faint);border-radius:4px}
    .canvas-area{flex:1;min-width:0}
    .canvas-drop{min-height:280px;border:2px dashed var(--border);border-radius:var(--radius-lg);padding:16px;transition:var(--transition);background:transparent}
    .canvas-drop.drag-over{border-color:var(--teal);background:var(--teal-soft)}
    .canvas-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:64px 24px;color:var(--text-muted)}
    .canvas-empty-icon{width:56px;height:56px;border-radius:16px;background:var(--bg-elevated);display:flex;align-items:center;justify-content:center;font-size:24px;color:var(--text-faint);margin-bottom:16px}
    .canvas-empty p{font-size:14px;text-align:center;margin:0;line-height:1.6}
    .q-card{background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden;transition:var(--transition);box-shadow:var(--shadow-xs);animation:scaleIn .3s ease both}
    .q-card:hover{box-shadow:var(--shadow-sm);border-color:rgba(255,255,255,0.1)}
    .q-card.saved{border-color:var(--green-border)}
    .q-card.saved .q-header{background:var(--green-soft)}
    .q-card.sortable-chosen{box-shadow:var(--shadow-lg);transform:rotate(0.5deg)}
    .q-card.sortable-ghost{opacity:0.3}
    .q-header{display:flex;align-items:center;gap:12px;padding:14px 18px;cursor:pointer;transition:var(--transition)}
    .q-header:hover{background:var(--bg-elevated)}
    .q-drag{color:var(--text-faint);cursor:grab;font-size:16px;transition:var(--transition)}
    .q-drag:hover{color:var(--text-muted)}.q-drag:active{cursor:grabbing}
    .q-num{width:28px;height:28px;border-radius:8px;background:var(--teal);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0;transition:var(--transition-spring)}
    .q-card:hover .q-num{transform:scale(1.08)}
    .q-title{flex:1;font-size:14px;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .q-type-tag{font-size:11px;font-weight:600;color:var(--teal);background:var(--teal-soft);padding:3px 10px;border-radius:100px;white-space:nowrap}
    .q-saved-tag{font-size:11px;font-weight:600;color:var(--green);background:var(--green-soft);padding:3px 10px;border-radius:100px;display:none}
    .q-card.saved .q-saved-tag{display:inline-block}
    .q-chevron{color:var(--text-faint);font-size:14px;transition:transform .25s ease;padding:4px;background:none;border:none;cursor:pointer}
    .q-chevron.open{transform:rotate(180deg)}
    .q-remove{background:none;border:none;color:var(--text-faint);font-size:14px;padding:4px 6px;cursor:pointer;transition:var(--transition);border-radius:6px}
    .q-remove:hover{color:var(--red);background:var(--red-soft)}
    .q-body{display:none;padding:20px 20px 18px;border-top:1px solid var(--border-light);animation:fadeIn .2s ease}
    .q-body.show{display:block}
    .q-body .field-group{margin-bottom:16px}
    .q-body label{display:block;font-size:12px;font-weight:600;color:var(--text-muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:0.4px}
    .q-body .field-input{background:var(--bg-input);border:1.5px solid var(--border);font-size:14px;padding:10px 14px}
    .q-body .field-input:focus{background:var(--bg-elevated);border-color:var(--border-focus);box-shadow:0 0 0 3px var(--teal-glow)}
    .q-body .field-input:disabled{background:var(--bg);color:var(--text-muted);cursor:not-allowed}
    .ans-section{margin-top:14px}
    .ans-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
    .ans-header label{margin:0}
    .ans-hint{font-size:11px;font-style:italic;color:var(--text-muted);font-weight:400;text-transform:none;letter-spacing:0}
    .ans-item{display:flex;align-items:center;gap:8px;margin-bottom:6px;padding:8px 10px;background:var(--bg-elevated);border:1.5px solid var(--border);border-radius:var(--radius-sm);transition:var(--transition);flex-wrap:wrap}
    .ans-item:hover{border-color:rgba(255,255,255,0.1)}
    .ans-item.is-other{border-color:var(--amber-border);background:var(--amber-soft)}
    .ans-item.has-logic{border-left:3px solid var(--purple);background:var(--purple-soft)}
    .ans-item.is-other.has-logic{border-color:var(--amber-border);border-left:3px solid var(--purple)}
    .ans-drag{color:var(--text-faint);cursor:grab;font-size:14px}.ans-drag:active{cursor:grabbing}
    .ans-input{flex:1;background:var(--bg-input);border:1.5px solid var(--border);border-radius:6px;padding:8px 12px;font-size:13px;font-family:inherit;color:var(--text-primary);outline:none;transition:var(--transition);min-width:100px}
    .ans-input::placeholder{color:var(--text-faint)}
    .ans-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 2px var(--teal-glow)}
    .ans-input:disabled{background:var(--bg);color:var(--text-muted)}
    .ans-pill{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border-radius:100px;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:0.4px;cursor:pointer;transition:var(--transition);border:1.5px solid var(--border);background:var(--bg-input);color:var(--text-muted);white-space:nowrap;flex-shrink:0}
    .ans-pill:hover{border-color:var(--text-muted)}
    .ans-pill input{display:none}
    .ans-pill.other-pill.active{background:var(--amber-soft);border-color:var(--amber-border);color:var(--amber)}
    .ans-pill.logic-pill.active{background:var(--purple-soft);border-color:var(--purple-border);color:var(--purple)}
    .ans-rm{background:none;border:none;color:var(--text-faint);cursor:pointer;padding:4px;border-radius:4px;font-size:13px;transition:var(--transition)}
    .ans-rm:hover{color:var(--red);background:var(--red-soft)}
    .logic-panel{display:none;width:100%;margin-top:8px;padding:12px 14px;background:var(--bg-card);border:1.5px solid var(--purple-border);border-radius:var(--radius-sm);animation:slideUp .2s ease both}
    .logic-panel.show{display:block}
    .logic-panel label{font-size:11px;font-weight:600;color:var(--purple);text-transform:uppercase;letter-spacing:0.3px;margin-bottom:5px;display:block}
    .logic-select,.logic-input{width:100%;background:var(--bg-input);border:1.5px solid var(--border);border-radius:6px;padding:7px 10px;font-size:12px;font-family:inherit;color:var(--text-primary);outline:none;transition:var(--transition)}
    .logic-select:focus,.logic-input:focus{border-color:var(--purple-border);box-shadow:0 0 0 2px rgba(124,58,237,0.1)}
    .logic-select option{background:var(--bg-card);color:var(--text-primary)}
    .logic-sub{margin-top:8px;display:none}.logic-sub.show{display:block}
    .logic-summary{margin-top:8px;font-size:11px;color:var(--text-muted);font-style:italic}
    .logic-summary i{color:var(--purple)}
    .add-ans-btn{width:100%;padding:10px;border:1.5px dashed var(--border);background:transparent;border-radius:var(--radius-sm);font-size:13px;font-weight:500;font-family:inherit;color:var(--text-muted);cursor:pointer;transition:var(--transition);margin-top:4px}
    .add-ans-btn:hover{border-color:var(--teal);color:var(--teal);background:var(--teal-soft)}
    .img-ans-item{display:flex;align-items:center;gap:10px;margin-bottom:8px;padding:10px 12px;background:var(--bg-elevated);border:1.5px solid var(--border);border-radius:var(--radius-sm)}
    .img-ans-item .ans-drag{color:var(--text-faint);cursor:grab;font-size:14px}
    .img-upload-wrap{flex:1;display:flex;align-items:center;gap:10px}
    .img-upload-inner{flex:1}
    .img-upload-label{font-size:11px;color:var(--text-muted);margin-bottom:4px}
    .img-file-input{background:var(--bg-input);border:1.5px solid var(--border);color:var(--text-secondary);border-radius:6px;padding:6px 10px;font-size:12px;width:100%}
    .img-file-input::-webkit-file-upload-button{background:var(--teal-soft);color:var(--teal);border:1px solid var(--teal-medium);border-radius:4px;padding:4px 12px;margin-right:10px;cursor:pointer;font-size:11px}
    .img-preview{width:48px;height:48px;border-radius:6px;object-fit:cover;border:1px solid var(--border);display:none}
    .img-preview.has-image{display:block}
    .q-actions{display:flex;gap:8px;margin-top:16px;padding-top:14px;border-top:1px solid var(--border-light)}
    .btn-q-save{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:var(--radius-sm);font-size:13px;font-weight:600;font-family:inherit;cursor:pointer;transition:var(--transition-spring);border:1.5px solid var(--green-border);background:var(--green-soft);color:var(--green)}
    .btn-q-save:hover{background:var(--green);color:#fff;transform:translateY(-1px);box-shadow:0 4px 12px rgba(16,185,129,0.25)}
    .btn-q-edit{display:none;align-items:center;gap:6px;padding:8px 18px;border-radius:var(--radius-sm);font-size:13px;font-weight:600;font-family:inherit;cursor:pointer;transition:var(--transition-spring);border:1.5px solid rgba(51,179,174,0.3);background:var(--teal-soft);color:var(--teal)}
    .btn-q-edit:hover{background:var(--teal);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-teal)}
    .submit-row{max-width:1280px;margin:24px auto 0;display:flex;justify-content:space-between;align-items:center;animation:slideUp .5s ease .25s both}
    .btn-back{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;background:var(--bg-card);color:var(--text-secondary);border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:14px;font-weight:500;font-family:inherit;cursor:pointer;transition:var(--transition);text-decoration:none}
    .btn-back:hover{background:var(--bg-elevated);border-color:rgba(255,255,255,0.1);color:var(--text-primary)}
    .btn-submit{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;background:var(--teal);color:#fff;border:none;border-radius:var(--radius-sm);font-size:15px;font-weight:600;font-family:inherit;cursor:pointer;transition:var(--transition-spring);box-shadow:var(--shadow-teal);letter-spacing:-0.01em}
    .btn-submit:hover{background:var(--teal-dark);transform:translateY(-2px);box-shadow:0 8px 28px rgba(51,179,174,0.25)}
    .btn-submit:active{transform:translateY(-1px)}
    @@media(max-width:768px){
        .edit-page{padding:16px}
        .builder-layout{flex-direction:column}
        .palette{width:100%;min-width:unset;position:static;display:flex;flex-wrap:wrap;gap:4px;padding:12px;max-height:none}
        .palette-title{width:100%}
        .palette-item{flex:0 0 auto;margin-bottom:0;padding:8px 10px;font-size:12px}
        .meta-row{grid-template-columns:1fr}
        .submit-row{flex-direction:column-reverse;gap:12px}
        .submit-row .btn-back,.submit-row .btn-submit{width:100%;justify-content:center}
    }
    .text-danger{color:var(--red)!important;font-size:12px}
</style>

<div class="edit-page">
    <form asp-action="Edit" asp-controller="Questionnaire" method="post" id="questionnaireForm" enctype="multipart/form-data">
        <input type="hidden" asp-for="Id" />
        <div asp-validation-summary="All" class="text-danger mb-3"></div>

        <div class="page-top">
            <div class="page-breadcrumb">
                <a href="@Url.Action("Index", "Questionnaire")">Questionnaires</a>
                <span class="sep">/</span>
                <span>Edit</span>
            </div>
            <div class="page-title-row">
                <h1 class="page-title">Edit Questionnaire<span class="page-title-accent"></span></h1>
                <div class="question-counter-pill">
                    <span class="counter-number" id="questionCounter">@(Model.Questions?.Count ?? 0)</span>
                    <span>questions</span>
                </div>
            </div>
        </div>

        <div class="meta-card">
            <div class="meta-row">
                <div class="field-group">
                    <label asp-for="Title">Title</label>
                    <input asp-for="Title" class="field-input" placeholder="Enter questionnaire title" />
                    <span asp-validation-for="Title" class="text-danger"></span>
                </div>
                <div class="field-group">
                    <label asp-for="Description">Description</label>
                    <textarea asp-for="Description" class="field-input" rows="1" placeholder="Brief description"></textarea>
                    <span asp-validation-for="Description" class="text-danger"></span>
                </div>
            </div>
        </div>

        <div class="builder-layout">
            <div class="palette">
                <div class="palette-title">Question Types</div>
                <div id="questionTypePalette">
                    <div class="palette-item" data-type="Text" draggable="true"><span class="p-icon"><i class="bi bi-fonts"></i></span>Text</div>
                    <div class="palette-item" data-type="CheckBox" draggable="true"><span class="p-icon"><i class="bi bi-check2-square"></i></span>Checkbox</div>
                    <div class="palette-item" data-type="TrueFalse" draggable="true"><span class="p-icon"><i class="bi bi-toggle-on"></i></span>True / False</div>
                    <div class="palette-item" data-type="Multiple_choice" draggable="true"><span class="p-icon"><i class="bi bi-ui-radios"></i></span>Multiple Choice</div>
                    <div class="palette-item" data-type="Rating" draggable="true"><span class="p-icon"><i class="bi bi-star"></i></span>Rating</div>
                    <div class="palette-item" data-type="Likert" draggable="true"><span class="p-icon"><i class="bi bi-distribute-horizontal"></i></span>Likert Scale</div>
                    <div class="palette-item" data-type="Matrix" draggable="true"><span class="p-icon"><i class="bi bi-grid-3x3"></i></span>Matrix</div>
                    <div class="palette-item" data-type="Open_ended" draggable="true"><span class="p-icon"><i class="bi bi-chat-left-text"></i></span>Open Ended</div>
                    <div class="palette-item" data-type="Demographic" draggable="true"><span class="p-icon"><i class="bi bi-people"></i></span>Demographic</div>
                    <div class="palette-item" data-type="Ranking" draggable="true"><span class="p-icon"><i class="bi bi-sort-numeric-down"></i></span>Ranking</div>
                    <div class="palette-item" data-type="Image" draggable="true"><span class="p-icon"><i class="bi bi-image"></i></span>Image</div>
                    <div class="palette-item" data-type="Slider" draggable="true"><span class="p-icon"><i class="bi bi-sliders"></i></span>Slider</div>
                </div>
            </div>

            <div class="canvas-area">
                <div class="canvas-drop" id="questionsCanvas">
                    <div class="canvas-empty" id="canvasPlaceholder" style="@(Model.Questions != null && Model.Questions.Count > 0 ? "display:none" : "")">
                        <div class="canvas-empty-icon"><i class="bi bi-plus-lg"></i></div>
                        <p>Drag a question type from the left<br>or click one to add it here</p>
                    </div>
                </div>
            </div>
        </div>

        <div class="submit-row">
            <a href="@Url.Action("Index", "Questionnaire")" class="btn-back"><i class="bi bi-arrow-left"></i> Back to List</a>
            <button type="submit" class="btn-submit"><i class="bi bi-check-lg"></i> Update Questionnaire</button>
        </div>

        <div id="hiddenFormData"></div>
    </form>
</div>
@section Scripts {
<script src="https://cdn.jsdelivr.net/npm/sortablejs@1.15.0/Sortable.min.js"></script>
<script>
$(document).ready(function () {

    const typesRequiredAnswers = ['CheckBox','TrueFalse','Multiple_choice','Rating','Likert','Ranking','Demographic'];
    const typesOptionalAnswers = ['Text','Open_ended','Matrix','Slider'];
    const typeIsImage = 'Image';
    const typesWithOther = ['Multiple_choice','CheckBox','TrueFalse','Demographic','Likert','Matrix'];
    const typesWithConditions = ['Multiple_choice','CheckBox','TrueFalse','Demographic','Likert','Matrix','Rating','Ranking','Image'];
    const defaultAnswers = { 'TrueFalse':['True','False'], 'Likert':['Strongly Disagree','Disagree','Neutral','Agree','Strongly Agree'], 'Rating':['1','2','3','4','5'] };
    let questionIndex = 0;

    const canvas = document.getElementById('questionsCanvas');
    Sortable.create(canvas, { animation: 200, handle: '.q-drag', ghostClass: 'sortable-ghost', chosenClass: 'sortable-chosen', filter: '.canvas-empty', onSort: () => { updateNums(); rebuild(); refreshAllJumps(); } });

    // Palette drag & click
    document.querySelectorAll('.palette-item').forEach(b => {
        b.addEventListener('dragstart', e => { e.dataTransfer.setData('qType', b.dataset.type); e.dataTransfer.effectAllowed = 'copy'; });
        b.addEventListener('click', () => addQ(b.dataset.type));
    });
    canvas.addEventListener('dragover', e => { e.preventDefault(); e.dataTransfer.dropEffect = 'copy'; canvas.classList.add('drag-over'); });
    canvas.addEventListener('dragleave', () => canvas.classList.remove('drag-over'));
    canvas.addEventListener('drop', e => { e.preventDefault(); canvas.classList.remove('drag-over'); const t = e.dataTransfer.getData('qType'); if (t) addQ(t); });

    // ===== ADD NEW QUESTION =====
    function addQ(type, existingText, existingAnswers, existingQId) {
        $('#canvasPlaceholder').hide();
        const qi = questionIndex;
        const isImg = type === typeIsImage;
        const isOpt = typesOptionalAnswers.includes(type);
        const hasOther = typesWithOther.includes(type);
        const hasCond = typesWithConditions.includes(type);
        const qText = existingText || '';
        const titleDisplay = qText || 'Untitled Question';

        let ansHtml = '';
        if (isImg) {
            ansHtml = `<div class="ans-section"><div class="ans-header"><label>Image Answers</label></div><div class="img-ans-list" data-qi="${qi}">${imgAns(qi,0)}</div><button type="button" class="add-ans-btn add-img-btn" data-qi="${qi}"><i class="bi bi-plus"></i> Add Image</button></div>`;
        } else {
            let items = '';
            if (existingAnswers && existingAnswers.length > 0) {
                existingAnswers.forEach((a, i) => {
                    const isOth = a.isOther || false;
                    items += ansItem(qi, i, a.text, isOth, hasOther, hasCond, a.id, a.conditionJson);
                });
            } else {
                const defs = defaultAnswers[type] || [];
                if (defs.length) defs.forEach((v,i) => items += ansItem(qi,i,v,false,hasOther,hasCond,0,null));
                else { items += ansItem(qi,0,'',false,hasOther,hasCond,0,null); items += ansItem(qi,1,'',false,hasOther,hasCond,0,null); }
            }
            const hint = isOpt ? `<span class="ans-hint">(optional)</span>` : '';
            ansHtml = `<div class="ans-section"><div class="ans-header"><label>Answers ${hint}</label></div><div class="ans-list" data-qi="${qi}" data-other="${hasOther}" data-cond="${hasCond}">${items}</div><button type="button" class="add-ans-btn add-txt-btn" data-qi="${qi}" data-other="${hasOther}" data-cond="${hasCond}"><i class="bi bi-plus"></i> Add Answer</button></div>`;
        }

        const label = type.replace('_',' ');
        const qIdAttr = existingQId ? ` data-qid="${existingQId}"` : '';

        $(canvas).append(`
            <div class="q-card" data-qi="${qi}" data-type="${type}"${qIdAttr}>
                <div class="q-header">
                    <span class="q-drag"><i class="bi bi-grip-vertical"></i></span>
                    <span class="q-num">${qi+1}</span>
                    <span class="q-title" id="qTitle_${qi}">${esc(titleDisplay)}</span>
                    <span class="q-type-tag">${label}</span>
                    <span class="q-saved-tag"><i class="bi bi-check"></i> Saved</span>
                    <button type="button" class="q-chevron" data-ti="${qi}"><i class="bi bi-chevron-down"></i></button>
                    <button type="button" class="q-remove" data-ri="${qi}"><i class="bi bi-x-lg"></i></button>
                </div>
                <div class="q-body" id="qBody_${qi}">
                    <div class="field-group"><label>Question Text</label><textarea class="field-input q-text" data-qi="${qi}" placeholder="Type your question here..." rows="2">${esc(qText)}</textarea></div>
                    ${ansHtml}
                    <div class="q-actions">
                        <button type="button" class="btn-q-save" data-qi="${qi}"><i class="bi bi-check-lg"></i> Save</button>
                        <button type="button" class="btn-q-edit" data-qi="${qi}"><i class="bi bi-pencil"></i> Edit</button>
                    </div>
                </div>
            </div>`);

        // Init sortable on answer list
        const al = document.querySelector(`.ans-list[data-qi="${qi}"]`);
        if (al) Sortable.create(al, { animation: 150, handle: '.ans-drag', ghostClass: 'sortable-ghost', onSort: () => rebuild() });
        const il = document.querySelector(`.img-ans-list[data-qi="${qi}"]`);
        if (il) Sortable.create(il, { animation: 150, handle: '.ans-drag', ghostClass: 'sortable-ghost', onSort: () => rebuild() });

        questionIndex++;
        updateNums(); rebuild(); refreshAllJumps();

        // If loading existing, auto-save the card
        if (existingText) {
            autoSaveCard(qi);
        }
    }

    function autoSaveCard(qi) {
        const card = $(`.q-card[data-qi="${qi}"]`);
        card.find('.q-text,.ans-input,.img-file-input,.oth-chk,.cond-action,.cond-jump,.cond-skip,.cond-end').prop('disabled', true);
        card.find('.txt-rm,.img-rm,.logic-pill,.other-pill').css('pointer-events','none').css('opacity','0.4');
        card.find('.add-txt-btn,.add-img-btn').hide();
        card.find('.ans-drag').css('visibility','hidden');
        card.find('.btn-q-save').hide();
        card.find('.btn-q-edit').css('display','inline-flex');
        card.addClass('saved');
        $(`#qBody_${qi}`).removeClass('show');
        card.find('.q-chevron').removeClass('open');
    }

    // ===== ANSWER ITEM =====
    function ansItem(qi, ai, val, isOth, supOther, supCond, ansId, condJson) {
        const othCls = isOth ? 'is-other' : '';
        const othPill = supOther ? `<label class="ans-pill other-pill ${isOth?'active':''}" title="Other option"><input type="checkbox" class="oth-chk" ${isOth?'checked':''}><i class="bi bi-chat-dots"></i> Other</label>` : '';
        const condPill = supCond ? `<label class="ans-pill logic-pill" title="Condition logic"><i class="bi bi-lightning"></i> Logic</label>` : '';
        const condPanel = supCond ? `
            <div class="logic-panel">
                <label><i class="bi bi-lightning-fill"></i> When selected:</label>
                <select class="logic-select cond-action"><option value="0">\u27a1\ufe0f Continue normally</option><option value="1">\ud83c\udfaf Jump to question</option><option value="2">\u23ed\ufe0f Skip questions</option><option value="3">\ud83c\udfc1 End survey</option></select>
                <div class="logic-sub sub-jump"><label>Jump to:</label><select class="logic-select cond-jump"><option value="">-- select --</option></select></div>
                <div class="logic-sub sub-skip"><label>Skip how many:</label><input type="number" class="logic-input cond-skip" min="1" value="1" /></div>
                <div class="logic-sub sub-end"><label>End message:</label><input type="text" class="logic-input cond-end" placeholder="Thank you!" /></div>
                <div class="logic-summary"><i class="bi bi-info-circle"></i> <span class="cond-sum">Continue normally</span></div>
            </div>` : '';
        const aidAttr = ansId ? ` data-aid="${ansId}"` : '';
        const condAttr = condJson ? ` data-cond='${esc(condJson)}'` : '';
        return `<div class="ans-item ${othCls}" data-ai="${ai}"${aidAttr}${condAttr}><span class="ans-drag"><i class="bi bi-grip-vertical"></i></span><input type="text" class="ans-input" placeholder="Answer option..." value="${esc(val)}" />${othPill}${condPill}<button type="button" class="ans-rm txt-rm" title="Remove"><i class="bi bi-trash3"></i></button>${condPanel}</div>`;
    }

    function imgAns(qi, ai) {
        return `<div class="img-ans-item" data-ai="${ai}"><span class="ans-drag"><i class="bi bi-grip-vertical"></i></span><div class="img-upload-wrap"><div class="img-upload-inner"><div class="img-upload-label">Image ${ai+1}</div><input type="file" class="img-file-input" accept="image/*" data-qi="${qi}" data-ai="${ai}" /></div><img class="img-preview" id="imgP_${qi}_${ai}" src="" alt="" /></div><button type="button" class="ans-rm img-rm" title="Remove"><i class="bi bi-trash3"></i></button></div>`;
    }

    // ===== LOAD EXISTING QUESTIONS FROM MODEL =====
    @if(Model.Questions != null && Model.Questions.Count > 0)
    {
        <text>
        const existingQuestions = [
            @for(int i = 0; i < Model.Questions.Count; i++)
            {
                var q = Model.Questions[i];
                var typeStr = q.Type.ToString();
                var qTextJs = q.Text?.Replace("\\", "\\\\").Replace("'", "\\'").Replace("\n", "\\n").Replace("\r", "") ?? "";
                <text>{
                    id: @q.Id,
                    text: '@Html.Raw(qTextJs)',
                    type: '@typeStr',
                    answers: [
                        @if(q.Answers != null)
                        {
                            for(int j = 0; j < q.Answers.Count; j++)
                            {
                                var a = q.Answers[j];
                                var aTextJs = a.Text?.Replace("\\", "\\\\").Replace("'", "\\'").Replace("\n", "\\n").Replace("\r", "") ?? "";
                                <text>{ id: @a.Id, text: '@Html.Raw(aTextJs)', isOther: false, conditionJson: null }@(j < q.Answers.Count - 1 ? "," : "")</text>
                            }
                        }
                    ]
                }@(i < Model.Questions.Count - 1 ? "," : "")</text>
            }
        ];

        existingQuestions.forEach(eq => {
            addQ(eq.type, eq.text, eq.answers, eq.id);
        });
        </text>
    }

    // ===== CONDITION LOGIC =====
    $(document).on('click', '.logic-pill', function () {
        const panel = $(this).closest('.ans-item').find('.logic-panel');
        panel.toggleClass('show'); $(this).toggleClass('active');
        if (panel.hasClass('show')) refreshJump($(this).closest('.ans-item'));
    });
    $(document).on('change', '.cond-action', function () {
        const p = $(this).closest('.logic-panel');
        p.find('.logic-sub').removeClass('show');
        const v = $(this).val();
        if (v==='1') p.find('.sub-jump').addClass('show');
        else if (v==='2') p.find('.sub-skip').addClass('show');
        else if (v==='3') p.find('.sub-end').addClass('show');
        updateSum(p); updateAnsState($(this).closest('.ans-item')); rebuild();
    });
    $(document).on('change', '.cond-jump', function () { updateSum($(this).closest('.logic-panel')); rebuild(); });
    $(document).on('input', '.cond-skip', function () { updateSum($(this).closest('.logic-panel')); rebuild(); });
    $(document).on('input', '.cond-end', function () { rebuild(); });

    function updateSum(p) {
        const a = p.find('.cond-action').val(), s = p.find('.cond-sum');
        if (a==='0') s.text('Continue normally');
        else if (a==='1') { const t = p.find('.cond-jump option:selected').text(); s.text(t && t!=='-- select --' ? 'Jump to '+t : 'Jump to question'); }
        else if (a==='2') s.text('Skip '+(p.find('.cond-skip').val()||1)+' question(s)');
        else if (a==='3') s.text('End the survey');
    }
    function updateAnsState(item) {
        const a = item.find('.cond-action').val();
        if (a && a !== '0') { item.addClass('has-logic'); item.find('.logic-pill').addClass('active'); }
        else { item.removeClass('has-logic'); if (!item.find('.logic-panel').hasClass('show')) item.find('.logic-pill').removeClass('active'); }
    }
    function refreshJump(item) {
        const sel = item.find('.cond-jump'); if (!sel.length) return;
        const cv = sel.val(); sel.empty().append('<option value="">-- select --</option>');
        const ci = item.closest('.q-card').index();
        $('.q-card').each(function (i) {
            if (i<=ci) return;
            const n=i+1, t=$(this).find('.q-title').text()||'Untitled';
            sel.append(`<option value="${n}">Q${n}: ${t.length>35?t.substring(0,35)+'...':t}</option>`);
        });
        if (cv) sel.val(cv);
    }
    function refreshAllJumps() { $('.ans-item').each(function () { refreshJump($(this)); }); }

    // ===== OTHER =====
    $(document).on('change', '.oth-chk', function () {
        const item = $(this).closest('.ans-item'), pill = $(this).closest('.ans-pill');
        if ($(this).is(':checked')) { item.addClass('is-other'); pill.addClass('active'); const inp = item.find('.ans-input'); if (!inp.val().trim()) inp.val('Other (please specify)'); }
        else { item.removeClass('is-other'); pill.removeClass('active'); }
        rebuild();
    });

    // ===== IMAGE =====
    $(document).on('change', '.img-file-input', function () {
        const qi=$(this).data('qi'), ai=$(this).data('ai'), p=$(`#imgP_${qi}_${ai}`);
        if (this.files&&this.files[0]) { const r=new FileReader(); r.onload=e=>p.attr('src',e.target.result).addClass('has-image'); r.readAsDataURL(this.files[0]); }
        else p.attr('src','').removeClass('has-image');
        rebuild();
    });

    // ===== ADD/REMOVE =====
    $(document).on('click', '.add-txt-btn', function () {
        const qi=$(this).data('qi'), o=String($(this).data('other'))==='true', c=String($(this).data('cond'))==='true';
        const list=$(this).siblings('.ans-list');
        list.append(ansItem(qi,list.children().length,'',false,o,c,0,null));
        list.find('.ans-item:last .ans-input').focus(); rebuild(); refreshAllJumps();
    });
    $(document).on('click', '.txt-rm', function () { const l=$(this).closest('.ans-list'); if(l.children().length>1) $(this).closest('.ans-item').fadeOut(150,function(){$(this).remove();rebuild();refreshAllJumps();}); });
    $(document).on('click', '.add-img-btn', function () { const qi=$(this).data('qi'),l=$(this).siblings('.img-ans-list'); l.append(imgAns(qi,l.children().length)); rebuild(); });
    $(document).on('click', '.img-rm', function () { const l=$(this).closest('.img-ans-list'); if(l.children().length>1) $(this).closest('.img-ans-item').fadeOut(150,function(){$(this).remove();rebuild();}); });

    // ===== TOGGLE / REMOVE =====
    $(document).on('click', '.q-header', function (e) { if($(e.target).closest('.q-remove').length)return; const i=$(this).find('.q-chevron').data('ti'); $(`#qBody_${i}`).toggleClass('show'); $(this).find('.q-chevron').toggleClass('open'); });
    $(document).on('click', '.q-remove', function (e) { e.stopPropagation(); $(this).closest('.q-card').fadeOut(200,function(){$(this).remove();updateNums();rebuild();refreshAllJumps();if(!$('.q-card').length)$('#canvasPlaceholder').show();}); });

    // ===== SAVE / EDIT =====
    $(document).on('click', '.btn-q-save', function () {
        const qi=$(this).data('qi'), card=$(this).closest('.q-card'), type=card.data('type');
        if(!card.find('.q-text').val().trim()){card.find('.q-text').css('border-color','var(--red)').focus();return;}
        if(typesRequiredAnswers.includes(type)){let bad=false;card.find('.ans-input').each(function(){if(!$(this).val().trim()){$(this).css('border-color','var(--red)');bad=true;}});if(bad)return;}
        if(type===typeIsImage){let m=false;card.find('.img-file-input').each(function(){if(!this.files||!this.files[0]){const p=$(this).closest('.img-ans-item').find('.img-preview');if(!p.hasClass('has-image')){$(this).css('border-color','var(--red)');m=true;}}});if(m)return;}
        card.find('.q-text,.ans-input,.img-file-input,.oth-chk,.cond-action,.cond-jump,.cond-skip,.cond-end').prop('disabled',true);
        card.find('.txt-rm,.img-rm,.logic-pill,.other-pill').css('pointer-events','none').css('opacity','0.4');
        card.find('.add-txt-btn,.add-img-btn').hide();
        card.find('.ans-drag').css('visibility','hidden');
        card.find('.btn-q-save').hide(); card.find('.btn-q-edit').css('display','inline-flex');
        card.addClass('saved'); $(`#qBody_${qi}`).removeClass('show'); card.find('.q-chevron').removeClass('open');
        rebuild();
    });

    $(document).on('click', '.btn-q-edit', function () {
        const qi=$(this).data('qi'), card=$(this).closest('.q-card');
        card.find('.q-text,.ans-input,.img-file-input,.oth-chk,.cond-action,.cond-jump,.cond-skip,.cond-end').prop('disabled',false);
        card.find('.txt-rm,.img-rm,.logic-pill,.other-pill').css('pointer-events','').css('opacity','');
        card.find('.add-txt-btn,.add-img-btn').show();
        card.find('.ans-drag').css('visibility','visible');
        card.find('.btn-q-edit').hide(); card.find('.btn-q-save').show();
        card.removeClass('saved'); $(`#qBody_${qi}`).addClass('show'); card.find('.q-chevron').addClass('open');
        card.find('.q-text').focus();
    });

    $(document).on('input', '.q-text', function () { const qi=$(this).data('qi'); $(`#qTitle_${qi}`).text($(this).val().trim()||'Untitled Question'); $(this).css('border-color',''); rebuild(); refreshAllJumps(); });
    $(document).on('input', '.ans-input', function () { $(this).css('border-color',''); rebuild(); });

    // ===== NUMBERING =====
    function updateNums() {
        let c = 0;
        $('.q-card').each(function (i) { $(this).find('.q-num').text(i+1); c++; });
        $('#questionCounter').text(c);
    }

    // ===== CONDITION JSON =====
    function buildCond(item) {
        const sel = item.find('.cond-action'); if (!sel.length) return null;
        const a = sel.val(); if (!a || a==='0') return null;
        let c = {ActionType:parseInt(a)};
        if (a==='1'){const t=item.find('.cond-jump').val();if(t)c.TargetQuestionNumber=parseInt(t);}
        else if(a==='2'){const s=item.find('.cond-skip').val();if(s)c.SkipCount=parseInt(s);}
        else if(a==='3'){const m=item.find('.cond-end').val();if(m)c.EndMessage=m;}
        return JSON.stringify(c);
    }

    // ===== REBUILD HIDDEN FORM =====
    function rebuild() {
        const ct = $('#hiddenFormData'); ct.empty();
        $('.q-card').each(function (qi) {
            const card=$(this), type=card.data('type'), text=card.find('.q-text').val()||'';
            const qid = card.data('qid') || 0;
            // Include Question Id for existing questions
            if (qid) ct.append(`<input type="hidden" name="Questions[${qi}].Id" value="${qid}" />`);
            ct.append(`<input type="hidden" name="Questions[${qi}].Text" value="${esc(text)}" />`);
            ct.append(`<input type="hidden" name="Questions[${qi}].Type" value="${type}" />`);
            let ai=0;
            card.find('.ans-list .ans-item').each(function(){
                const v=$(this).find('.ans-input').val()||'', isO=$(this).find('.oth-chk').is(':checked'), cj=buildCond($(this));
                const aid = $(this).data('aid') || 0;
                if(v.trim()||typesRequiredAnswers.includes(type)){
                    // Include Answer Id for existing answers
                    if (aid) ct.append(`<input type="hidden" name="Questions[${qi}].Answers[${ai}].Id" value="${aid}" />`);
                    ct.append(`<input type="hidden" name="Questions[${qi}].Answers[${ai}].Text" value="${esc(v)}" />`);
                    ct.append(`<input type="hidden" name="Questions[${qi}].Answers[${ai}].IsOtherOption" value="${isO}" />`);
                    if(cj) ct.append(`<input type="hidden" name="Questions[${qi}].Answers[${ai}].ConditionJson" value="${esc(cj)}" />`);
                    ai++;
                }
            });
            if(type===typeIsImage) card.find('.img-file-input').each(function(ii){$(this).attr('name',`ImageFiles_${qi}_${ii}`);});
        });
    }

    function esc(t){const d=document.createElement('div');d.appendChild(document.createTextNode(t));return d.innerHTML;}

    // ===== FORM SUBMIT =====
    $('#questionnaireForm').on('submit', function (e) {
        // Re-enable all fields before submission
        $('.q-card.saved').find('.img-file-input,.q-text,.ans-input,.oth-chk,.cond-action,.cond-jump,.cond-skip,.cond-end').prop('disabled',false);
        rebuild();
        if(!$('.q-card').length){e.preventDefault();alert('Please add at least one question.');return false;}
        let ok=true;
        $('.q-card').each(function(){if(!$(this).find('.q-text').val()?.trim()){$(this).find('.q-text').css('border-color','var(--red)');ok=false;}});
        if(!ok){e.preventDefault();alert('Please fill in all question texts.');return false;}
    });
});
</script>
}