// مدیریت رابط کاربری (مدال‌ها، شیت‌ها، تغییر صفحات)

async function loadHome() {
    document.getElementById('homeScreen').style.display = 'flex';
    document.getElementById('editorScreen').style.display = 'none';
    
    if (!db) {
         try { await initDB(); } catch(e) { console.error("DB Init Failed inside loadHome"); return; }
    }

    const tx = db.transaction("projects", "readonly");
    const store = tx.objectStore("projects");
    const req = store.getAll();
    
    req.onsuccess = (e) => {
        let projects = e.target.result;
        projects.sort((a, b) => b.id - a.id);
        
        const grid = document.getElementById('projectsGrid');
        const placeholder = document.getElementById('noProjectsPlaceholder');

        if (projects.length === 0) {
            grid.innerHTML = '';
            placeholder.style.display = 'flex';
        } else {
            placeholder.style.display = 'none';
            grid.innerHTML = '';
            
            projects.forEach((p, index) => {
                const card = document.createElement('div');
                card.className = 'project-card';
                card.onclick = () => openProject(p.id);
                
                const thumbUrl = p.thumbnail ? `url(${p.thumbnail})` : 'none';
                
                card.innerHTML = `
                    <div class="card-thumb" style="background-image: ${thumbUrl}">
                        <div class="card-overlay"></div>
                        <div class="card-menu" onclick="openActionSheet(${p.id}, '${p.name}', event)"><i class="fa-solid fa-ellipsis"></i></div>
                        <div class="card-duration">${p.duration || '00:00'}</div>
                    </div>
                    <div class="card-details">
                        <div class="card-title">${p.name}</div>
                        <div class="card-date">${p.dateStr}</div>
                    </div>
                `;
                grid.appendChild(card);
            });
        }
    };
}

function openActionSheet(id, name, event) {
    event.stopPropagation();
    currentActionProjectId = id;
    currentActionProjectName = name;
    const sheet = document.getElementById('projectActionOverlay');
    sheet.style.display = 'flex';
}

function closeActionSheet() {
    const sheet = document.getElementById('projectActionOverlay');
    sheet.style.display = 'none';
}

function openDeleteConfirmation() {
    closeActionSheet();
    showConfirmationModal({
        iconClass: 'fa-solid fa-trash-can',
        title: 'حذف پروژه',
        description: `آیا از حذف کامل «${currentActionProjectName}» مطمئن هستید؟`,
        confirmText: 'بله، حذف کن',
        confirmClass: 'delete',
        onConfirm: () => {
            const tx = db.transaction("projects", "readwrite");
            const store = tx.objectStore("projects");
            
            // ابتدا دریافت پروژه از دیتابیس مرورگر برای پیدا کردن شناسه سرور (file_id)
            store.get(currentActionProjectId).onsuccess = (e) => {
                const project = e.target.result;
                if (project && project.state && project.state.id) {
                    const fileId = project.state.id;
                    // ارسال درخواست حذف به سرور در پس‌زمینه (بدون معطل کردن کاربر)
                    fetch(`/api/delete-project/${fileId}`, { method: 'DELETE' })
                        .catch(err => console.error("Failed to delete project files on server:", err));
                }
                
                // حذف پروژه از دیتابیس محلی مرورگر
                store.delete(currentActionProjectId);
            };
            
            tx.oncomplete = () => loadHome();
        }
    });
}

function openRenameModal() {
    closeActionSheet();
    const modal = document.getElementById('renameModal');
    const input = document.getElementById('renameInput');
    input.value = currentActionProjectName;
    modal.style.display = 'flex';
    setTimeout(() => modal.classList.add('show'), 10);
}

function closeRenameModal() {
    const modal = document.getElementById('renameModal');
    modal.classList.remove('show');
    setTimeout(() => modal.style.display = 'none', 300);
}

function saveRename() {
    const newName = document.getElementById('renameInput').value.trim();
    if (newName && currentActionProjectId) {
        const tx = db.transaction("projects", "readwrite");
        const store = tx.objectStore("projects");
        store.get(currentActionProjectId).onsuccess = (e) => {
            const project = e.target.result;
            if (project) {
                project.name = newName;
                store.put(project);
            }
        };
        tx.oncomplete = () => {
            closeRenameModal();
            loadHome();
        };
    } else {
        closeRenameModal();
    }
}

function toggleTool(toolName) {
    document.querySelectorAll('.tool-btn').forEach(b => b.classList.remove('active-tool'));
    const btnId = 'btn-' + toolName;
    const btn = document.getElementById(btnId);
    
    const sectionId = 'section-' + toolName;
    const section = document.getElementById(sectionId);
    
    const isAlreadyOpen = toolsContainer.classList.contains('open') && section.style.display === 'block';

    if (isAlreadyOpen) {
        toolsContainer.classList.remove('open');
        setTimeout(() => { section.style.display = 'none'; }, 200);
    } else {
        document.querySelectorAll('.tool-section').forEach(s => s.style.display = 'none');
        if(btn) btn.classList.add('active-tool');
        section.style.display = 'block';
        section.classList.add('active-section');
        toolsContainer.classList.add('open');
        
        if(toolName === 'text') {
            toolsContainer.style.maxHeight = 'none';
            renderSegList(); 

            if (state.segs && state.segs.length > 0) {
                let sIdxToSelect = 0;
                const curTime = v.currentTime;
                const currentSegIdx = state.segs.findIndex(s => curTime >= s.start && curTime <= s.end);
                
                if (currentSegIdx !== -1) sIdxToSelect = currentSegIdx;
                else {
                    const nextSegIdx = state.segs.findIndex(s => s.start > curTime);
                    if (nextSegIdx !== -1) sIdxToSelect = nextSegIdx;
                }

                setTimeout(() => {
                    if (state.segs[sIdxToSelect] && state.segs[sIdxToSelect].words.length > 0) {
                        highlightWord(sIdxToSelect, 0, true);
                    }
                }, 50);
            }
        } else {
            toolsContainer.style.maxHeight = ''; 
        }
    }
}

function toggleCustomAccordion() { document.getElementById('customAccordion').classList.toggle('open'); }

function closeAllSheets() {
    const overlay = document.getElementById('sheetOverlay');
    overlay.classList.remove('show');
    document.querySelectorAll('.bottom-sheet').forEach(s => { 
        s.classList.remove('active'); 
    });
    document.getElementById('textInput').blur();
    
    if(previewInterval) clearInterval(previewInterval);
    v.pause();
    
    const icon1 = document.getElementById('btnPreviewPlay')?.querySelector('i');
    if(icon1) icon1.className = "fa-solid fa-play";
    
    const icon2 = document.getElementById('btnTimeSheetPlayIcon');
    if(icon2) icon2.className = "fa-solid fa-play";
}

function openSheet(type) {
    if (!activeWordId && type !== 'regenerate' && type !== 'wordcount') return;
    
    closeAllSheets();
    const targetSheet = document.getElementById(`sheet-${type}`);
    const overlay = document.getElementById('sheetOverlay');

    if(type === 'text') {
        const [sIdx, wIdx] = activeWordId.split('-').map(Number);
        const seg = state.segs[sIdx];
        const word = seg.words[wIdx];
        document.getElementById('textInput').value = word.word;
        document.getElementById('textTimeDisplay').innerText = `${fmt(word.start)} -> ${fmt(word.end)}`;
    } else if(type === 'time') {
        const [sIdx, wIdx] = activeWordId.split('-').map(Number);
        const seg = state.segs[sIdx];
        const word = seg.words[wIdx];
        
        tempStartTime = word.start; 
        tempEndTime = word.end;
        
        document.getElementById('timeSheetWord').innerText = word.word;
        
        const prevBox = document.getElementById('prevWordPreview');
        const nextBox = document.getElementById('nextWordPreview');
        
        // محاسبه محدوده مجاز (Boundary)
        let minAllowed = 0;
        let maxAllowed = v.duration || 1000;

        // محاسبه کلمه قبل و حد پایین
        if (wIdx > 0) {
            prevBox.innerText = seg.words[wIdx - 1].word;
            minAllowed = seg.words[wIdx - 1].end;
        } else if (sIdx > 0 && state.segs[sIdx-1].words.length > 0) {
            const prevSeg = state.segs[sIdx-1];
            prevBox.innerText = prevSeg.words[prevSeg.words.length - 1].word;
            minAllowed = prevSeg.words[prevSeg.words.length - 1].end;
        } else {
            prevBox.innerText = "-";
            minAllowed = 0;
        }

        // محاسبه کلمه بعد و حد بالا
        if (wIdx < seg.words.length - 1) {
            nextBox.innerText = seg.words[wIdx + 1].word;
            maxAllowed = seg.words[wIdx + 1].start;
        } else if (sIdx < state.segs.length - 1 && state.segs[sIdx+1].words.length > 0) {
            nextBox.innerText = state.segs[sIdx+1].words[0].word;
            maxAllowed = state.segs[sIdx+1].words[0].start;
        } else {
            nextBox.innerText = "-";
            maxAllowed = v.duration || tempEndTime + 5;
        }

        // راه‌اندازی Trimmer با محدوده‌های دقیق
        if(typeof initTrimmerUI === 'function') {
            initTrimmerUI(tempStartTime, tempEndTime, minAllowed, maxAllowed);
        }

    } else if(type === 'delete') {
        const [sIdx, wIdx] = activeWordId.split('-').map(Number);
        const seg = state.segs[sIdx];
        const word = seg.words[wIdx];
        document.getElementById('deleteMsgText').innerHTML = `آیا کلمه <span class="highlight-word">«${word.word}»</span> حذف شود؟`;
    } else if (type === 'regenerate') {
        if (typeof isRegenerating !== 'undefined' && isRegenerating) {
            document.getElementById('regen-step-start').style.display = 'none';
            document.getElementById('regen-step-loading').style.display = 'flex';
            document.getElementById('regen-step-success').style.display = 'none';
        } else {
            document.getElementById('regen-step-start').style.display = 'flex';
            document.getElementById('regen-step-loading').style.display = 'none';
            document.getElementById('regen-step-success').style.display = 'none';
        }
    }

    setTimeout(() => { 
        overlay.classList.add('show'); 
        targetSheet.classList.add('active'); 
    }, 50);
}

function preConfirmRegenerate() {
    showConfirmationModal({
        iconClass: 'fa-solid fa-rotate',
        title: 'بازنویسی هوشمند',
        description: 'آیا می‌خواهید هوش مصنوعی دوباره ویدیو را بررسی کرده و زیرنویس‌ها را از نو بنویسد؟ (زیرنویس‌های فعلی حذف می‌شوند)',
        confirmText: 'بله، بازنویسی کن',
        confirmClass: 'split',
        onConfirm: () => {
            regenerateProjectSubtitles();
        }
    });
}

function showConfirmationModal(config) {
    const modal = document.getElementById('confirmationModal');
    document.getElementById('confirmIcon').querySelector('i').className = config.iconClass;
    document.getElementById('confirmTitle').innerText = config.title;
    document.getElementById('confirmDesc').innerText = config.description;
    const btn = document.getElementById('confirmBtn');
    btn.innerText = config.confirmText; btn.className = 'modal-btn btn-confirm-action ' + config.confirmClass;
    btn.onclick = () => { config.onConfirm(); closeConfirmationModal(); };
    modal.style.display = 'flex'; setTimeout(() => modal.classList.add('show'), 10);
}
function closeConfirmationModal() { const m = document.getElementById('confirmationModal'); m.classList.remove('show'); setTimeout(() => m.style.display = 'none', 300); }