import { apiGet, apiPost, apiPut, apiPatch, apiDelete } from '../api.js';
import { canEdit, showToast } from '../app.js';
import { navigate } from '../router.js';
import {
    OPTION_TYPES,
    layoutSelectHTML,
    layoutLabel,
    parseConfig,
    questionLocalIds,
    configFormHTML,
    readConfigFromForm,
    esc,
} from '../editor-utils.js';

let questionnaire = null;
let questions = [];
let isNew = false;
let activeTab = 'questions';

// ── Entry point ──────────────────────────────────────────────────────────

export async function editorPage(params) {
    const app = document.getElementById('app');
    isNew = !params.id || params.id === 'new';
    activeTab = 'questions';

    app.innerHTML = `
        <div class="page-header">
            <h1 id="editorTitle">${isNew ? 'New Questionnaire' : 'Loading...'}</h1>
            <div class="actions">
                <a href="#/" class="btn">&larr; Back</a>
                ${!isNew ? `<a href="#/questionnaire/${params.id}/results" class="btn">View Results</a>` : ''}
            </div>
        </div>
        <div id="editorContent"><div class="spinner"></div></div>
    `;

    if (isNew) {
        questionnaire = { questionnaireID: null, name: '', version: '1.0', state: 'draft',
                          orderIndex: 0, showPoints: 0, conditionJson: '{}' };
        questions = [];
        renderEditor();
    } else {
        try {
            const [qnData, quData] = await Promise.all([
                apiGet('questionnaires.php'),
                apiGet(`questions.php?questionnaireID=${encodeURIComponent(params.id)}`)
            ]);
            questionnaire = (qnData.questionnaires || []).find(q => q.questionnaireID === params.id);
            if (!questionnaire) {
                showToast('Questionnaire not found', 'error');
                navigate('#/');
                return;
            }
            questions = quData.questions || [];
            document.getElementById('editorTitle').textContent = questionnaire.name;
            renderEditor();
        } catch (e) {
            showToast(e.message, 'error');
            document.getElementById('editorContent').innerHTML = `<p class="error-text">${esc(e.message)}</p>`;
        }
    }
}

// ── Main editor render (helpers in editor-utils.js) ─────────────────────

function renderEditor() {
    const container = document.getElementById('editorContent');
    const editable = canEdit();
    const condJson = questionnaire.conditionJson || '{}';

    container.innerHTML = `
        <div class="card" style="margin-bottom:20px">
            <h3 style="margin-bottom:12px">Questionnaire Details</h3>
            <div class="meta-form">
                <div class="form-group">
                    <label>Name</label>
                    <input type="text" id="metaName" value="${esc(questionnaire.name)}" ${editable ? '' : 'disabled'}>
                </div>
                <div class="form-group">
                    <label>Version</label>
                    <input type="text" id="metaVersion" value="${esc(questionnaire.version)}" ${editable ? '' : 'disabled'}>
                </div>
                <div class="form-group">
                    <label>State</label>
                    <select id="metaState" ${editable ? '' : 'disabled'}>
                        ${['draft','active','archived'].map(s =>
                            `<option value="${s}" ${questionnaire.state === s ? 'selected' : ''}>${s}</option>`
                        ).join('')}
                    </select>
                </div>
            </div>
            <div class="meta-form" style="margin-top:0">
                <div class="form-group">
                    <label>Order index</label>
                    <input type="number" id="metaOrder" value="${questionnaire.orderIndex ?? 0}" min="0" ${editable ? '' : 'disabled'}>
                </div>
                <div class="form-group" style="display:flex;align-items:flex-end;padding-bottom:16px">
                    <label class="checkbox-label">
                        <input type="checkbox" id="metaShowPoints" ${questionnaire.showPoints ? 'checked' : ''} ${editable ? '' : 'disabled'}> Show points
                    </label>
                </div>
            </div>
            ${editable ? `
            <details class="condition-details" style="margin-bottom:16px">
                <summary style="cursor:pointer;font-size:.85rem;font-weight:600;color:var(--text-secondary)">
                    Availability Condition (JSON)
                </summary>
                <textarea id="metaCondition" rows="6"
                    style="width:100%;margin-top:8px;font-family:monospace;font-size:.85rem;padding:8px 12px;border:1px solid var(--border);border-radius:6px"
                >${formatJson(condJson)}</textarea>
            </details>
            ` : ''}
            ${editable ? `<button class="btn btn-primary" id="saveMetaBtn">${isNew ? 'Create Questionnaire' : 'Save Changes'}</button>` : ''}
        </div>

        ${!isNew ? `
        <div class="tab-bar" id="editorTabs">
            <button class="active" data-tab="questions">Questions (${questions.length})</button>
            <button data-tab="translations">Translations</button>
        </div>
        <div id="tabContent-questions">
            <div class="card">
                <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:16px">
                    <h3>Questions</h3>
                    ${editable ? `<button class="btn btn-primary btn-sm" id="addQuestionBtn">+ Add Question</button>` : ''}
                </div>
                <div id="addQuestionFormWrapper" style="display:none"></div>
                <ul class="question-list" id="questionList"></ul>
            </div>
        </div>
        <div id="tabContent-translations" style="display:none">
            <div class="card" id="translationsCard">
                <div id="translationsContent"><div class="spinner"></div></div>
            </div>
        </div>
        ` : '<p style="color:var(--text-secondary);margin-top:12px">Save the questionnaire first, then add questions.</p>'}
    `;

    if (editable) {
        document.getElementById('saveMetaBtn').addEventListener('click', saveMeta);
    }

    if (!isNew) {
        initTabs();
        renderQuestions();
        if (editable) {
            document.getElementById('addQuestionBtn').addEventListener('click', showAddQuestionForm);
            initDragReorder();
        }
    }
}

function initTabs() {
    const tabBar = document.getElementById('editorTabs');
    if (!tabBar) return;
    tabBar.querySelectorAll('button').forEach(btn => {
        btn.addEventListener('click', () => {
            const tab = btn.dataset.tab;
            if (tab === activeTab) return;
            activeTab = tab;
            tabBar.querySelectorAll('button').forEach(b => b.classList.toggle('active', b.dataset.tab === tab));
            document.getElementById('tabContent-questions').style.display = tab === 'questions' ? '' : 'none';
            document.getElementById('tabContent-translations').style.display = tab === 'translations' ? '' : 'none';
            if (tab === 'translations') loadTranslationsTab();
        });
    });
}

function formatJson(str) {
    try {
        return JSON.stringify(JSON.parse(str), null, 2);
    } catch {
        return str;
    }
}

// ── Save questionnaire meta ──────────────────────────────────────────────

async function saveMeta() {
    const name       = document.getElementById('metaName').value.trim();
    const version    = document.getElementById('metaVersion').value.trim();
    const state      = document.getElementById('metaState').value;
    const orderIndex = parseInt(document.getElementById('metaOrder').value || '0', 10);
    const showPoints = document.getElementById('metaShowPoints').checked ? 1 : 0;
    let conditionJson = '{}';
    const condEl = document.getElementById('metaCondition');
    if (condEl) {
        try {
            JSON.parse(condEl.value);
            conditionJson = condEl.value.trim();
        } catch {
            showToast('Condition JSON is invalid', 'error');
            return;
        }
    }
    if (!name) { showToast('Name is required', 'error'); return; }

    try {
        if (isNew) {
            const data = await apiPost('questionnaires.php', { name, version, state, orderIndex, showPoints, conditionJson });
            if (data.success) {
                questionnaire = data.questionnaire;
                isNew = false;
                showToast('Questionnaire created', 'success');
                navigate(`#/questionnaire/${questionnaire.questionnaireID}`);
            }
        } else {
            const data = await apiPut('questionnaires.php', {
                questionnaireID: questionnaire.questionnaireID,
                name, version, state, orderIndex, showPoints, conditionJson
            });
            if (data.success) {
                questionnaire = { ...questionnaire, name, version, state, orderIndex, showPoints, conditionJson };
                document.getElementById('editorTitle').textContent = name;
                showToast('Saved', 'success');
            }
        }
    } catch (e) {
        showToast(e.message, 'error');
    }
}

// ── Add question form ────────────────────────────────────────────────────

function showAddQuestionForm() {
    const wrapper = document.getElementById('addQuestionFormWrapper');
    if (!wrapper) return;

    const pendingOptions = [];

    wrapper.style.display = '';
    wrapper.innerHTML = `
        <div class="inline-form-card">
            <h4>New Question</h4>
            <div class="form-row">
                <div class="form-group" style="flex:3">
                    <label>Question key</label>
                    <input type="text" id="aq_text" placeholder="e.g. consent_instruction">
                </div>
                <div class="form-group" style="flex:1;min-width:200px">
                    <label>Layout type</label>
                    ${layoutSelectHTML('radio_question', 'aq_type')}
                </div>
            </div>
            <label class="checkbox-label" style="margin-bottom:12px;display:inline-flex">
                <input type="checkbox" id="aq_required"> Required
            </label>

            <div id="aq_config_section"></div>

            <div id="aq_options_section">
                <div class="options-builder">
                    <label style="font-size:.85rem;font-weight:600;color:var(--text-secondary);display:block;margin-bottom:8px">
                        Answer Options
                    </label>
                    <ul class="pending-options-list" id="aq_pending_options"></ul>
                    <div style="display:flex;gap:8px;margin-top:6px;align-items:flex-end">
                        <div class="form-group" style="flex:3;margin-bottom:0">
                            <input type="text" id="aq_opt_text" placeholder="Option key...">
                        </div>
                        <div class="form-group" style="width:90px;margin-bottom:0">
                            <input type="number" id="aq_opt_pts" value="0" min="0" placeholder="Pts">
                        </div>
                        <div class="form-group" style="width:160px;margin-bottom:0">
                            <select id="aq_opt_next">
                                <option value="">(next in order)</option>
                                ${questionLocalIds(questions).map(q => `<option value="${esc(q.localId)}">${esc(q.localId)} - ${esc(q.defaultText)}</option>`).join('')}
                            </select>
                        </div>
                        <button class="btn btn-sm" id="aq_opt_add" style="flex-shrink:0;white-space:nowrap">+ Add</button>
                    </div>
                </div>
            </div>

            <div style="display:flex;gap:8px;margin-top:14px">
                <button class="btn btn-primary btn-sm" id="aq_submit">Add Question</button>
                <button class="btn btn-sm" id="aq_cancel">Cancel</button>
            </div>
        </div>
    `;

    function updateTypeUI() {
        const type = document.getElementById('aq_type').value;
        document.getElementById('aq_options_section').style.display = OPTION_TYPES.has(type) ? '' : 'none';
        document.getElementById('aq_config_section').innerHTML = configFormHTML(type, {}, 'aq_cfg');
    }

    function renderPendingOptions() {
        const list = document.getElementById('aq_pending_options');
        if (!list) return;
        if (!pendingOptions.length) {
            list.innerHTML = `<li class="pending-options-empty">No options yet.</li>`;
            return;
        }
        list.innerHTML = pendingOptions.map((opt, i) => `
            <li class="pending-option-item">
                <span class="opt-text">${esc(opt.text)}</span>
                <span class="opt-points">${opt.points} pts</span>
                ${opt.nextQuestionId ? `<span class="opt-branch">&rarr; ${esc(opt.nextQuestionId)}</span>` : ''}
                <button class="btn-icon remove-pending-opt" data-idx="${i}" title="Remove" style="color:var(--danger)">&#x2716;</button>
            </li>
        `).join('');
        list.querySelectorAll('.remove-pending-opt').forEach(btn => {
            btn.addEventListener('click', () => {
                pendingOptions.splice(parseInt(btn.dataset.idx, 10), 1);
                renderPendingOptions();
            });
        });
    }

    function addPendingOption() {
        const text = document.getElementById('aq_opt_text').value.trim();
        const pts  = parseInt(document.getElementById('aq_opt_pts').value || '0', 10);
        const next = document.getElementById('aq_opt_next').value;
        if (!text) { showToast('Option key is required', 'error'); return; }
        pendingOptions.push({ text, points: pts, nextQuestionId: next });
        renderPendingOptions();
        document.getElementById('aq_opt_text').value = '';
        document.getElementById('aq_opt_pts').value = '0';
        document.getElementById('aq_opt_next').value = '';
        document.getElementById('aq_opt_text').focus();
    }

    updateTypeUI();
    renderPendingOptions();
    document.getElementById('aq_text').focus();

    document.getElementById('aq_type').addEventListener('change', updateTypeUI);
    document.getElementById('aq_opt_add').addEventListener('click', addPendingOption);
    document.getElementById('aq_opt_text').addEventListener('keydown', (e) => {
        if (e.key === 'Enter') { e.preventDefault(); addPendingOption(); }
    });

    document.getElementById('aq_submit').addEventListener('click', async () => {
        const text = document.getElementById('aq_text').value.trim();
        const type = document.getElementById('aq_type').value;
        const isRequired = document.getElementById('aq_required').checked ? 1 : 0;
        const configJson = readConfigFromForm(type, 'aq_cfg');
        if (!text) { showToast('Question key is required', 'error'); return; }
        if (OPTION_TYPES.has(type) && pendingOptions.length === 0) {
            showToast('Add at least one answer option', 'error');
            return;
        }

        const btn = document.getElementById('aq_submit');
        btn.disabled = true;
        btn.textContent = 'Adding...';
        try {
            const qData = await apiPost('questions.php', {
                questionnaireID: questionnaire.questionnaireID,
                defaultText: text, type, isRequired, configJson
            });
            if (!qData.success) throw new Error(qData.error || 'Failed');

            const newQ = qData.question;
            newQ.answerOptions = [];

            for (const opt of pendingOptions) {
                const oData = await apiPost('answer_options.php', {
                    questionID: newQ.questionID,
                    defaultText: opt.text,
                    points: opt.points,
                    nextQuestionId: opt.nextQuestionId || '',
                });
                if (oData.success) newQ.answerOptions.push(oData.answerOption);
            }

            questions.push(newQ);
            renderQuestions();
            showToast('Question added', 'success');

            document.getElementById('aq_text').value = '';
            pendingOptions.length = 0;
            renderPendingOptions();
            updateTypeUI();
            document.getElementById('aq_text').focus();
        } catch (e) {
            showToast(e.message, 'error');
        } finally {
            if (document.getElementById('aq_submit')) {
                btn.disabled = false;
                btn.textContent = 'Add Question';
            }
        }
    });

    document.getElementById('aq_text').addEventListener('keydown', (e) => {
        if (e.key === 'Escape') hideAddQuestionForm();
    });
    document.getElementById('aq_cancel').addEventListener('click', hideAddQuestionForm);
}

function hideAddQuestionForm() {
    const wrapper = document.getElementById('addQuestionFormWrapper');
    if (wrapper) { wrapper.style.display = 'none'; wrapper.innerHTML = ''; }
}

// ── Questions list ───────────────────────────────────────────────────────

function renderQuestions() {
    const list = document.getElementById('questionList');
    if (!list) return;
    const editable = canEdit();

    // update tab label
    const tabBtn = document.querySelector('#editorTabs button[data-tab="questions"]');
    if (tabBtn) tabBtn.textContent = `Questions (${questions.length})`;

    if (!questions.length) {
        list.innerHTML = `<li class="empty-state" style="padding:30px"><h3>No questions yet</h3><p>Add your first question above.</p></li>`;
        return;
    }

    list.innerHTML = questions.map((q, idx) => `
        <li class="question-item" data-id="${q.questionID}" draggable="${editable}">
            <div class="question-header">
                ${editable ? '<span class="drag-handle" title="Drag to reorder">&#x2630;</span>' : ''}
                <span class="chevron">&#x25B6;</span>
                <span class="q-text">${idx + 1}. ${esc(q.defaultText)}</span>
                <span class="q-type">${esc(layoutLabel(q.type))}</span>
                ${q.isRequired ? '<span class="badge badge-active">Required</span>' : ''}
            </div>
            <div class="question-body" id="qbody-${q.questionID}"></div>
        </li>
    `).join('');

    list.querySelectorAll('.question-header').forEach((hdr, idx) => {
        hdr.addEventListener('click', (e) => {
            if (e.target.closest('.drag-handle')) return;
            const item = hdr.closest('.question-item');
            const wasOpen = item.classList.contains('open');
            item.classList.toggle('open');
            if (!wasOpen) renderQuestionBody(questions[idx]);
        });
    });
}

// ── Question body (expanded) ─────────────────────────────────────────────

function renderQuestionBody(q) {
    const body = document.getElementById(`qbody-${q.questionID}`);
    if (!body) return;
    const editable = canEdit();
    const options = q.answerOptions || [];
    const config = parseConfig(q);
    const layout = q.type || 'radio_question';

    body.innerHTML = `
        ${editable ? `
        <div class="q-edit-section">
            <div class="inline-form-card" style="margin-bottom:12px">
                <div class="form-row">
                    <div class="form-group" style="flex:3">
                        <label>Question key</label>
                        <input type="text" id="eq_text_${q.questionID}" value="${esc(q.defaultText)}">
                    </div>
                    <div class="form-group" style="flex:1;min-width:200px">
                        <label>Layout type</label>
                        ${layoutSelectHTML(layout, `eq_type_${q.questionID}`)}
                    </div>
                </div>
                <label class="checkbox-label" style="margin-bottom:12px;display:inline-flex">
                    <input type="checkbox" id="eq_req_${q.questionID}" ${q.isRequired ? 'checked' : ''}> Required
                </label>
                <div id="eq_config_${q.questionID}">
                    ${configFormHTML(layout, config, `eq_cfg_${q.questionID}`)}
                </div>
                <div style="display:flex;gap:8px;margin-top:8px">
                    <button class="btn btn-primary btn-sm save-q-btn">Save Question</button>
                    <button class="btn btn-sm btn-danger del-q-btn">Delete Question</button>
                </div>
            </div>
        </div>
        ` : `
        <div class="inline-form-card" style="margin-bottom:12px">
            <p><strong>Key:</strong> ${esc(q.defaultText)}</p>
            <p><strong>Layout:</strong> ${esc(layoutLabel(layout))}</p>
            ${Object.keys(config).length ? `<p><strong>Config:</strong> <code>${esc(JSON.stringify(config))}</code></p>` : ''}
        </div>
        `}

        ${OPTION_TYPES.has(layout) ? `
        <h4 style="font-size:.85rem;color:var(--text-secondary);margin-bottom:6px">Answer Options (${options.length})</h4>
        <ul class="option-list" id="opts-${q.questionID}">
            ${options.map(o => optionItemHTML(q, o, editable)).join('')
              || '<li style="color:var(--text-secondary);padding:8px;font-size:.85rem">No answer options</li>'}
        </ul>
        ${editable ? `
        <div id="addOptForm-${q.questionID}" style="display:none"></div>
        <button class="btn btn-sm" id="addOpt-${q.questionID}" style="margin-top:6px">+ Add Option</button>
        ` : ''}
        ` : ''}
    `;

    if (!editable) return;

    body.querySelector('.save-q-btn').addEventListener('click', () => {
        const text  = document.getElementById(`eq_text_${q.questionID}`).value.trim();
        const type  = document.getElementById(`eq_type_${q.questionID}`).value;
        const isReq = document.getElementById(`eq_req_${q.questionID}`).checked ? 1 : 0;
        const cj    = readConfigFromForm(type, `eq_cfg_${q.questionID}`);
        if (!text) { showToast('Question key is required', 'error'); return; }
        updateQuestion(q.questionID, { defaultText: text, type, isRequired: isReq, configJson: cj });
    });

    document.getElementById(`eq_type_${q.questionID}`).addEventListener('change', () => {
        const newLayout = document.getElementById(`eq_type_${q.questionID}`).value;
        document.getElementById(`eq_config_${q.questionID}`).innerHTML = configFormHTML(newLayout, {}, `eq_cfg_${q.questionID}`);
    });

    body.querySelector('.del-q-btn').addEventListener('click', () => deleteQuestion(q));

    body.querySelectorAll('.edit-opt-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            const opt = options.find(o => o.answerOptionID === btn.dataset.id);
            if (opt) showEditOptionForm(q, opt);
        });
    });
    body.querySelectorAll('.del-opt-btn').forEach(btn => {
        btn.addEventListener('click', () => deleteOption(q, btn.dataset.id));
    });

    const addOptBtn = document.getElementById(`addOpt-${q.questionID}`);
    if (addOptBtn) addOptBtn.addEventListener('click', () => showAddOptionForm(q));

    if (OPTION_TYPES.has(layout)) initOptionDrag(q);
}

function optionItemHTML(q, o, editable) {
    return `
        <li class="option-item" data-id="${o.answerOptionID}" draggable="${editable}">
            ${editable ? '<span class="drag-handle" style="font-size:.9rem">&#x2630;</span>' : ''}
            <span class="opt-text">${esc(o.defaultText)}</span>
            <span class="opt-points">${o.points} pts</span>
            ${o.nextQuestionId ? `<span class="opt-branch">&rarr; ${esc(o.nextQuestionId)}</span>` : ''}
            ${editable ? `
                <button class="btn-icon edit-opt-btn" data-id="${o.answerOptionID}" title="Edit">&#x270E;</button>
                <button class="btn-icon del-opt-btn" data-id="${o.answerOptionID}" title="Delete" style="color:var(--danger)">&#x2716;</button>
            ` : ''}
        </li>
    `;
}

// ── Add option form ──────────────────────────────────────────────────────

function showAddOptionForm(q) {
    const wrapper = document.getElementById(`addOptForm-${q.questionID}`);
    const toggleBtn = document.getElementById(`addOpt-${q.questionID}`);
    if (!wrapper) return;
    toggleBtn.style.display = 'none';
    wrapper.style.display = '';

    const qIds = questionLocalIds(questions);

    wrapper.innerHTML = `
        <div class="inline-form-card" style="margin-top:8px">
            <div class="form-row">
                <div class="form-group" style="flex:3">
                    <label>Option key</label>
                    <input type="text" id="ao_text_${q.questionID}" placeholder="e.g. consent_signed">
                </div>
                <div class="form-group" style="flex:1;min-width:100px">
                    <label>Points</label>
                    <input type="number" id="ao_pts_${q.questionID}" value="0" min="0">
                </div>
                <div class="form-group" style="flex:1;min-width:160px">
                    <label>Next question</label>
                    <select id="ao_next_${q.questionID}">
                        <option value="">(next in order)</option>
                        ${qIds.map(qi => `<option value="${esc(qi.localId)}">${esc(qi.localId)} - ${esc(qi.defaultText)}</option>`).join('')}
                    </select>
                </div>
            </div>
            <div style="display:flex;gap:8px">
                <button class="btn btn-primary btn-sm" id="ao_submit_${q.questionID}">Add Option</button>
                <button class="btn btn-sm" id="ao_cancel_${q.questionID}">Cancel</button>
            </div>
        </div>
    `;

    document.getElementById(`ao_text_${q.questionID}`).focus();

    document.getElementById(`ao_submit_${q.questionID}`).addEventListener('click', async () => {
        const text   = document.getElementById(`ao_text_${q.questionID}`).value.trim();
        const points = parseInt(document.getElementById(`ao_pts_${q.questionID}`).value || '0', 10);
        const nextQ  = document.getElementById(`ao_next_${q.questionID}`).value;
        if (!text) { showToast('Option key is required', 'error'); return; }

        const btn = document.getElementById(`ao_submit_${q.questionID}`);
        btn.disabled = true;
        btn.textContent = 'Adding...';
        try {
            const data = await apiPost('answer_options.php', {
                questionID: q.questionID, defaultText: text, points, nextQuestionId: nextQ
            });
            if (data.success) {
                if (!q.answerOptions) q.answerOptions = [];
                q.answerOptions.push(data.answerOption);
                renderQuestionBody(q);
                showToast('Option added', 'success');
            }
        } catch (e) {
            showToast(e.message, 'error');
            btn.disabled = false;
            btn.textContent = 'Add Option';
        }
    });

    document.getElementById(`ao_text_${q.questionID}`).addEventListener('keydown', (e) => {
        if (e.key === 'Enter') document.getElementById(`ao_submit_${q.questionID}`).click();
        if (e.key === 'Escape') hideAddOptionForm(q);
    });
    document.getElementById(`ao_cancel_${q.questionID}`).addEventListener('click', () => hideAddOptionForm(q));
}

function hideAddOptionForm(q) {
    const wrapper = document.getElementById(`addOptForm-${q.questionID}`);
    const toggleBtn = document.getElementById(`addOpt-${q.questionID}`);
    if (wrapper) { wrapper.style.display = 'none'; wrapper.innerHTML = ''; }
    if (toggleBtn) toggleBtn.style.display = '';
}

// ── Edit option form ─────────────────────────────────────────────────────

function showEditOptionForm(q, opt) {
    const li = document.querySelector(`#opts-${q.questionID} .option-item[data-id="${opt.answerOptionID}"]`);
    if (!li) return;
    const qIds = questionLocalIds(questions);

    li.innerHTML = `
        <div class="inline-form-card" style="width:100%;padding:8px">
            <div class="form-row">
                <div class="form-group" style="flex:3;margin-bottom:8px">
                    <input type="text" id="eo_text_${opt.answerOptionID}" value="${esc(opt.defaultText)}">
                </div>
                <div class="form-group" style="flex:1;min-width:80px;margin-bottom:8px">
                    <input type="number" id="eo_pts_${opt.answerOptionID}" value="${opt.points}" min="0">
                </div>
                <div class="form-group" style="flex:1;min-width:160px;margin-bottom:8px">
                    <select id="eo_next_${opt.answerOptionID}">
                        <option value="">(next in order)</option>
                        ${qIds.map(qi => `<option value="${esc(qi.localId)}" ${opt.nextQuestionId === qi.localId ? 'selected' : ''}>${esc(qi.localId)} - ${esc(qi.defaultText)}</option>`).join('')}
                    </select>
                </div>
            </div>
            <div style="display:flex;gap:6px">
                <button class="btn btn-primary btn-sm" id="eo_save_${opt.answerOptionID}">Save</button>
                <button class="btn btn-sm" id="eo_cancel_${opt.answerOptionID}">Cancel</button>
            </div>
        </div>
    `;
    li.draggable = false;

    document.getElementById(`eo_text_${opt.answerOptionID}`).focus();

    document.getElementById(`eo_save_${opt.answerOptionID}`).addEventListener('click', async () => {
        const text   = document.getElementById(`eo_text_${opt.answerOptionID}`).value.trim();
        const points = parseInt(document.getElementById(`eo_pts_${opt.answerOptionID}`).value || '0', 10);
        const nextQ  = document.getElementById(`eo_next_${opt.answerOptionID}`).value;
        if (!text) { showToast('Option key is required', 'error'); return; }
        await updateOption(q, opt.answerOptionID, { defaultText: text, points, nextQuestionId: nextQ });
    });

    document.getElementById(`eo_text_${opt.answerOptionID}`).addEventListener('keydown', (e) => {
        if (e.key === 'Enter') document.getElementById(`eo_save_${opt.answerOptionID}`).click();
        if (e.key === 'Escape') renderQuestionBody(q);
    });
    document.getElementById(`eo_cancel_${opt.answerOptionID}`).addEventListener('click', () => renderQuestionBody(q));
}

// ── Question CRUD ────────────────────────────────────────────────────────

async function updateQuestion(questionID, fields) {
    try {
        const data = await apiPut('questions.php', { questionID, ...fields });
        if (data.success) {
            const idx = questions.findIndex(q => q.questionID === questionID);
            if (idx >= 0) {
                questions[idx] = { ...questions[idx], ...data.question,
                    answerOptions: questions[idx].answerOptions };
            }
            renderQuestions();
            showToast('Question updated', 'success');
        }
    } catch (e) {
        showToast(e.message, 'error');
    }
}

async function deleteQuestion(q) {
    if (!confirm(`Delete "${q.defaultText}" and all its answers?`)) return;
    try {
        await apiDelete('questions.php', { questionID: q.questionID });
        questions = questions.filter(x => x.questionID !== q.questionID);
        renderQuestions();
        showToast('Question deleted', 'success');
    } catch (e) {
        showToast(e.message, 'error');
    }
}

// ── Answer option CRUD ───────────────────────────────────────────────────

async function updateOption(q, answerOptionID, fields) {
    try {
        const data = await apiPut('answer_options.php', { answerOptionID, ...fields });
        if (data.success) {
            const idx = q.answerOptions.findIndex(o => o.answerOptionID === answerOptionID);
            if (idx >= 0) q.answerOptions[idx] = { ...q.answerOptions[idx], ...data.answerOption };
            renderQuestionBody(q);
            showToast('Option updated', 'success');
        }
    } catch (e) {
        showToast(e.message, 'error');
    }
}

async function deleteOption(q, answerOptionID) {
    if (!confirm('Delete this answer option?')) return;
    try {
        await apiDelete('answer_options.php', { answerOptionID });
        q.answerOptions = (q.answerOptions || []).filter(o => o.answerOptionID !== answerOptionID);
        renderQuestionBody(q);
        showToast('Option deleted', 'success');
    } catch (e) {
        showToast(e.message, 'error');
    }
}

// ── Translations tab ─────────────────────────────────────────────────────

let transData = null;

async function loadTranslationsTab() {
    const container = document.getElementById('translationsContent');
    if (!container) return;
    container.innerHTML = '<div class="spinner"></div>';

    try {
        const data = await apiGet(`translations.php?questionnaireID=${encodeURIComponent(questionnaire.questionnaireID)}`);
        transData = data;
        renderTranslationsTab();
    } catch (e) {
        container.innerHTML = `<p class="error-text">${esc(e.message)}</p>`;
    }
}

function renderTranslationsTab() {
    const container = document.getElementById('translationsContent');
    if (!container || !transData) return;
    const editable = canEdit();
    const languages = transData.languages || [];
    const entries = transData.entries || [];
    const langCodes = languages.map(l => l.languageCode);

    if (!entries.length) {
        container.innerHTML = `
            ${editable ? languageManagerHTML(languages) : ''}
            <p style="color:var(--text-secondary);margin-top:12px">No translatable keys found. Add questions first.</p>
        `;
        if (editable) bindLanguageManager(languages);
        return;
    }

    const filterHtml = `
        <div class="trans-toolbar">
            <div class="trans-search-wrap">
                <input type="text" id="transFilter" placeholder="Filter keys..." class="trans-search-input">
            </div>
            <div class="trans-filter-types">
                <label class="checkbox-label"><input type="checkbox" class="trans-type-filter" value="question" checked> Questions</label>
                <label class="checkbox-label"><input type="checkbox" class="trans-type-filter" value="answer_option" checked> Options</label>
                <label class="checkbox-label"><input type="checkbox" class="trans-type-filter" value="string" checked> Strings</label>
            </div>
        </div>
    `;

    const typeBadge = (type) => {
        const map = { question: 'Q', answer_option: 'Opt', string: 'Str' };
        const cls = { question: 'badge-q', answer_option: 'badge-opt', string: 'badge-str' };
        return `<span class="trans-type-badge ${cls[type] || ''}">${map[type] || type}</span>`;
    };

    container.innerHTML = `
        ${editable ? languageManagerHTML(languages) : ''}
        ${filterHtml}
        <div class="table-wrapper trans-table-wrapper">
            <table class="data-table trans-table" id="transTable">
                <thead>
                    <tr>
                        <th class="col-key">Key</th>
                        <th class="col-type">Type</th>
                        ${langCodes.map(lc => `<th class="col-lang">${esc(lc.toUpperCase())}</th>`).join('')}
                    </tr>
                </thead>
                <tbody>
                    ${entries.map((entry, i) => `
                        <tr data-idx="${i}" data-type="${entry.type}" data-key="${esc(entry.key)}">
                            <td class="cell-key" title="${esc(entry.key)}">${esc(entry.key)}</td>
                            <td class="cell-type">${typeBadge(entry.type)}</td>
                            ${langCodes.map(lc => {
                                const val = entry.translations[lc] || '';
                                const missing = !val;
                                return `<td class="cell-trans ${missing ? 'cell-missing' : ''}">
                                    <input type="text"
                                        class="trans-cell-input"
                                        data-idx="${i}"
                                        data-lang="${esc(lc)}"
                                        value="${esc(val)}"
                                        ${editable ? '' : 'disabled'}
                                        placeholder="${missing ? 'missing' : ''}">
                                </td>`;
                            }).join('')}
                        </tr>
                    `).join('')}
                </tbody>
            </table>
        </div>
        <div class="trans-stats" id="transStats"></div>
    `;

    updateTransStats(entries, langCodes);

    if (editable) {
        bindLanguageManager(languages);
        bindTransCellEditing(entries);
    }
    bindTransFiltering();
}

function languageManagerHTML(languages) {
    return `
        <div class="lang-manager">
            <div class="lang-chips">
                ${languages.map(l => `
                    <span class="lang-chip">
                        <strong>${esc(l.languageCode.toUpperCase())}</strong>
                        ${l.name ? `<span class="lang-chip-name">${esc(l.name)}</span>` : ''}
                        <button class="lang-chip-remove" data-lc="${esc(l.languageCode)}" title="Remove language">&times;</button>
                    </span>
                `).join('')}
                ${!languages.length ? '<span style="color:var(--text-secondary);font-size:.85rem">No languages defined yet.</span>' : ''}
            </div>
            <div class="lang-add-row">
                <input type="text" id="newLangCode" placeholder="Code (e.g. de)" class="lang-add-code">
                <input type="text" id="newLangName" placeholder="Name (e.g. German)" class="lang-add-name">
                <button class="btn btn-sm btn-primary" id="addLangBtn">+ Add Language</button>
            </div>
        </div>
    `;
}

function bindLanguageManager(languages) {
    document.getElementById('addLangBtn')?.addEventListener('click', async () => {
        const code = document.getElementById('newLangCode').value.trim().toLowerCase();
        const name = document.getElementById('newLangName').value.trim();
        if (!code) { showToast('Language code is required', 'error'); return; }
        if (languages.some(l => l.languageCode === code)) {
            showToast('Language already exists', 'error');
            return;
        }
        try {
            await apiPut('translations.php', { type: 'language', languageCode: code, name });
            showToast(`Language "${code}" added`, 'success');
            loadTranslationsTab();
        } catch (e) {
            showToast(e.message, 'error');
        }
    });

    document.querySelectorAll('.lang-chip-remove').forEach(btn => {
        btn.addEventListener('click', async () => {
            const lc = btn.dataset.lc;
            if (!confirm(`Remove language "${lc}" and ALL its translations?`)) return;
            try {
                await apiDelete('translations.php', { type: 'language', languageCode: lc });
                showToast(`Language "${lc}" removed`, 'success');
                loadTranslationsTab();
            } catch (e) {
                showToast(e.message, 'error');
            }
        });
    });
}

function bindTransCellEditing(entries) {
    const debounceTimers = {};
    document.querySelectorAll('.trans-cell-input').forEach(inp => {
        inp.addEventListener('input', () => {
            const idx = parseInt(inp.dataset.idx, 10);
            const lang = inp.dataset.lang;
            const entry = entries[idx];
            if (!entry) return;

            entry.translations[lang] = inp.value;

            const cell = inp.closest('td');
            cell.classList.toggle('cell-missing', !inp.value);

            const timerKey = `${idx}_${lang}`;
            clearTimeout(debounceTimers[timerKey]);
            debounceTimers[timerKey] = setTimeout(async () => {
                try {
                    await apiPut('translations.php', {
                        type: entry.type,
                        id: entry.entityId,
                        languageCode: lang,
                        text: inp.value,
                    });
                    inp.classList.add('save-flash');
                    setTimeout(() => inp.classList.remove('save-flash'), 400);
                } catch (e) {
                    showToast(e.message, 'error');
                }
            }, 600);
        });

        inp.addEventListener('keydown', (e) => {
            if (e.key === 'Tab' || e.key === 'Enter') return;
            if (e.key === 'ArrowDown' || e.key === 'ArrowUp') {
                e.preventDefault();
                const row = inp.closest('tr');
                const cellIdx = [...row.children].indexOf(inp.closest('td'));
                const targetRow = e.key === 'ArrowDown' ? row.nextElementSibling : row.previousElementSibling;
                if (targetRow && !targetRow.classList.contains('trans-row-hidden')) {
                    const targetInput = targetRow.children[cellIdx]?.querySelector('input');
                    if (targetInput) targetInput.focus();
                }
            }
        });
    });
}

function bindTransFiltering() {
    const filterInput = document.getElementById('transFilter');
    const typeChecks = document.querySelectorAll('.trans-type-filter');
    const tbody = document.querySelector('#transTable tbody');
    if (!filterInput || !tbody) return;

    function applyFilter() {
        const text = filterInput.value.toLowerCase();
        const activeTypes = new Set([...typeChecks].filter(c => c.checked).map(c => c.value));
        let visible = 0;
        tbody.querySelectorAll('tr').forEach(row => {
            const key = row.dataset.key?.toLowerCase() || '';
            const type = row.dataset.type || '';
            const show = activeTypes.has(type) && (!text || key.includes(text));
            row.classList.toggle('trans-row-hidden', !show);
            if (show) visible++;
        });
        const stats = document.getElementById('transStats');
        if (stats) stats.textContent = `Showing ${visible} of ${tbody.children.length} keys`;
    }

    filterInput.addEventListener('input', applyFilter);
    typeChecks.forEach(c => c.addEventListener('change', applyFilter));
}

function updateTransStats(entries, langCodes) {
    const stats = document.getElementById('transStats');
    if (!stats) return;
    const total = entries.length * langCodes.length;
    let filled = 0;
    for (const e of entries) {
        for (const lc of langCodes) {
            if (e.translations[lc]) filled++;
        }
    }
    const pct = total ? Math.round((filled / total) * 100) : 0;
    stats.innerHTML = `
        <span>${entries.length} keys &times; ${langCodes.length} languages = ${total} cells</span>
        <span class="trans-stats-progress">
            <span class="trans-progress-bar"><span class="trans-progress-fill" style="width:${pct}%"></span></span>
            <strong>${filled}/${total}</strong> (${pct}%) translated
        </span>
    `;
}

// ── Drag & drop (questions) ──────────────────────────────────────────────

function initDragReorder() {
    const list = document.getElementById('questionList');
    if (!list) return;
    let dragItem = null;

    list.addEventListener('dragstart', (e) => {
        const item = e.target.closest('.question-item');
        if (!item || !e.target.closest('.drag-handle')) { e.preventDefault(); return; }
        dragItem = item;
        item.classList.add('dragging');
        e.dataTransfer.effectAllowed = 'move';
    });

    list.addEventListener('dragover', (e) => {
        e.preventDefault();
        const afterEl = getDragAfterElement(list, e.clientY, '.question-item');
        if (afterEl) list.insertBefore(dragItem, afterEl);
        else list.appendChild(dragItem);
    });

    list.addEventListener('dragend', async () => {
        if (!dragItem) return;
        dragItem.classList.remove('dragging');
        const newOrder = [...list.querySelectorAll('.question-item')].map(el => el.dataset.id);
        dragItem = null;

        const map = {};
        questions.forEach(q => map[q.questionID] = q);
        questions = newOrder.map(id => map[id]).filter(Boolean);

        try {
            await apiPatch('questions.php', {
                questionnaireID: questionnaire.questionnaireID,
                order: newOrder
            });
            showToast('Order saved', 'success');
        } catch (e) {
            showToast(e.message, 'error');
        }
    });
}

function initOptionDrag(q) {
    const list = document.getElementById(`opts-${q.questionID}`);
    if (!list) return;
    let dragItem = null;

    list.addEventListener('dragstart', (e) => {
        const item = e.target.closest('.option-item');
        if (!item || !e.target.closest('.drag-handle')) { e.preventDefault(); return; }
        dragItem = item;
        item.classList.add('dragging');
        e.dataTransfer.effectAllowed = 'move';
    });

    list.addEventListener('dragover', (e) => {
        e.preventDefault();
        const afterEl = getDragAfterElement(list, e.clientY, '.option-item');
        if (afterEl) list.insertBefore(dragItem, afterEl);
        else list.appendChild(dragItem);
    });

    list.addEventListener('dragend', async () => {
        if (!dragItem) return;
        dragItem.classList.remove('dragging');
        const newOrder = [...list.querySelectorAll('.option-item')].map(el => el.dataset.id);
        dragItem = null;

        const map = {};
        (q.answerOptions || []).forEach(o => map[o.answerOptionID] = o);
        q.answerOptions = newOrder.map(id => map[id]).filter(Boolean);

        try {
            await apiPatch('answer_options.php', {
                questionID: q.questionID,
                order: newOrder
            });
            showToast('Option order saved', 'success');
        } catch (e) {
            showToast(e.message, 'error');
        }
    });
}

function getDragAfterElement(container, y, selector) {
    const elements = [...container.querySelectorAll(`${selector}:not(.dragging)`)];
    return elements.reduce((closest, child) => {
        const box = child.getBoundingClientRect();
        const offset = y - box.top - box.height / 2;
        if (offset < 0 && offset > closest.offset) return { offset, element: child };
        return closest;
    }, { offset: Number.NEGATIVE_INFINITY }).element;
}