// منطق اصلی ادیتور (نمایش ویدیو، سینک متن، ابزارها)

function openProject(projectId) {
    currentProjectId = projectId;
    const tx = db.transaction("projects", "readonly");
    const store = tx.objectStore("projects");
    const req = store.get(projectId);
    
    req.onsuccess = (e) => {
        const p = e.target.result;
        if (!p) { alert('پروژه یافت نشد'); loadHome(); return; }
        
        state = p.state;
        document.getElementById('currentProjectTitle').innerText = p.name;
        const videoURL = URL.createObjectURL(p.videoBlob);
        v.src = videoURL;
        
        document.getElementById('col').value = state.st.col;
        document.getElementById('bgCol').value = state.st.bg;
        document.getElementById('fz').value = state.st.fz;
        document.getElementById('pos').value = state.st.y;
        
        document.querySelectorAll('.font-btn').forEach(btn => btn.classList.remove('ticked'));
        if(state.st.f === 'vazir') document.querySelectorAll('.font-btn')[1].classList.add('ticked');
        else if(state.st.f === 'lalezar') document.querySelectorAll('.font-btn')[0].classList.add('ticked');
        
        document.querySelectorAll('.style-card').forEach(c => c.classList.remove('selected'));
        if(state.st.name === 'karaoke_static') {
            const staticCard = Array.from(document.querySelectorAll('.style-card')).find(c => c.textContent.includes("هوشمند (ثابت)"));
            if(staticCard) staticCard.classList.add('selected');
            document.getElementById('staticColorPicker').value = state.st.col;
        }

        document.getElementById('homeScreen').style.display = 'none';
        document.getElementById('editorScreen').style.display = 'flex';
        
        renderSegList();
        fit();
        upd();
        
        v.onloadeddata = () => {
            fit();
            if(!p.thumbnail && v.duration > 1) {
                 v.currentTime = 1.0; 
                 let captured = false;
                 v.addEventListener('seeked', function cap() {
                     if(captured) return; captured = true; saveProjectToDB(); v.currentTime = 0;
                 }, {once:true});
            } else if (!p.thumbnail) { saveProjectToDB(); }
        };
    };
}

function goHome() { v.pause(); saveProjectToDB(); loadHome(); }

function fit() { 
    if(!state.w) return; 
    const ws = document.getElementById('workspace'); 
    const availableHeight = window.innerHeight * 0.6; 
    const scale = Math.min((ws.clientWidth - 40) / state.w, availableHeight / state.h); 
    const c = document.getElementById('videoContainer'); 
    c.style.width = state.w + 'px'; c.style.height = state.h + 'px'; 
    document.getElementById('scaler').style.transform = `scale(${scale})`; 
    ws.style.height = (state.h * scale + 40) + 'px';
}

function activateCustomStyle() {
    if(['karaoke_static', 'auto_director', 'plain_white', 'white_outline'].includes(state.st.name)) {
         state.st.name = 'classic';
         document.querySelectorAll('.style-card').forEach(c => c.classList.remove('selected'));
         const classicCard = document.querySelector('.custom-style-container .style-card:first-child');
         if(classicCard) classicCard.classList.add('selected');
    }
}

function renderSegList() {
    saveProjectToDB();
    const timeline = document.getElementById('timelineScroll');
    const spacers = timeline.querySelectorAll('.spacer');
    timeline.innerHTML = '';
    timeline.appendChild(spacers[0]); // Start spacer

    state.segs.forEach((seg, sIdx) => {
        if (!seg.words || seg.words.length === 0) {
            const wordsArr = seg.text.trim().split(/\s+/).filter(w => w.length > 0);
            const duration = seg.end - seg.start;
            const timePerWord = duration / Math.max(1, wordsArr.length);
            let wStart = seg.start;
            seg.words = wordsArr.map((wStr, i) => {
                let wEnd = wStart + timePerWord;
                if (i === wordsArr.length - 1) wEnd = seg.end;
                let obj = { word: wStr, start: parseFloat(wStart.toFixed(2)), end: parseFloat(wEnd.toFixed(2)) };
                wStart = wEnd;
                return obj;
            });
        }

        seg.words.forEach((w, wIdx) => {
            const el = document.createElement('div');
            el.className = 'word-chip';
            el.innerText = w.word;
            const uid = `${sIdx}-${wIdx}`;
            el.id = `w-${uid}`;
            
            if (activeWordId === uid) el.classList.add('active');

            el.onclick = (e) => {
                e.stopPropagation();
                highlightWord(sIdx, wIdx, true);
            };
            timeline.appendChild(el);
        });

        if (sIdx < state.segs.length - 1) {
            const nl = document.createElement('div');
            nl.className = 'newline-indicator';
            nl.innerHTML = '<i class="fa-solid fa-arrow-turn-down" style="transform: rotate(90deg) scaleX(-1);"></i>';
            timeline.appendChild(nl);
        }
    });

    timeline.appendChild(spacers[1]); // End spacer
    updateSplitButton();
}

function highlightWord(sIdx, wIdx, showToolbar) {
    activeWordId = `${sIdx}-${wIdx}`;
    v.pause();
    togglePlayIcon(false);
    const seg = state.segs[sIdx];
    const word = seg.words[wIdx];
    
    v.currentTime = word.start;
    manualOverride = true; 
    
    updateOverlayContent(v.currentTime);
    
    document.querySelectorAll('.word-chip').forEach(c => c.classList.remove('active'));
    const el = document.getElementById(`w-${activeWordId}`);
    if(el) {
        el.classList.add('active');
        el.scrollIntoView({ behavior: 'smooth', block: 'center', inline: 'center' });
    }
    
    if(showToolbar) document.getElementById('toolbar').classList.add('show');
    updateSplitButton();
}

function playPreviewWord() {
    if (!activeWordId) return;
    const [sIdx, wIdx] = activeWordId.split('-').map(Number);
    const word = state.segs[sIdx].words[wIdx];

    if(previewInterval) clearInterval(previewInterval);
    v.pause();
    v.currentTime = word.start;
    
    const icon = document.getElementById('btnPreviewPlay').querySelector('i');
    icon.className = "fa-solid fa-pause";
    v.play();
    
    previewInterval = setInterval(() => {
        if(v.currentTime >= word.end) {
            v.pause();
            clearInterval(previewInterval);
            icon.className = "fa-solid fa-play";
            if (v.currentTime >= word.end) v.currentTime = word.end - 0.01;
        }
    }, 20);
}

function saveText() {
    if (!activeWordId) return;
    const [sIdx, wIdx] = activeWordId.split('-').map(Number);
    const val = document.getElementById('textInput').value.trim();
    if (val) {
        state.segs[sIdx].words[wIdx].word = val;
        state.segs[sIdx].text = state.segs[sIdx].words.map(w => w.word).join(' ');
        renderSegList();
        highlightWord(sIdx, wIdx, true);
    }
    closeAllSheets();
}

function adjustTime(type, am) {
    if(type === 'start') {
        let v = parseFloat((tempStartTime + am).toFixed(2));
        if(v < 0) v = 0;
        if(v >= tempEndTime) v = parseFloat((tempEndTime - 0.1).toFixed(2));
        tempStartTime = v;
        document.getElementById('valStart').innerText = fmt(tempStartTime);
    } else {
        let v = parseFloat((tempEndTime + am).toFixed(2));
        if(v <= tempStartTime) v = parseFloat((tempStartTime + 0.1).toFixed(2));
        tempEndTime = v;
        document.getElementById('valEnd').innerText = fmt(tempEndTime);
    }
}

function confirmTimeChanges() {
    if (!activeWordId) return;
    const [sIdx, wIdx] = activeWordId.split('-').map(Number);
    const seg = state.segs[sIdx];
    seg.words[wIdx].start = tempStartTime;
    seg.words[wIdx].end = tempEndTime;
    if (wIdx === 0 && tempStartTime < seg.start) seg.start = tempStartTime;
    if (wIdx === seg.words.length - 1 && tempEndTime > seg.end) seg.end = tempEndTime;
    closeAllSheets();
    renderSegList();
    highlightWord(sIdx, wIdx, true);
}
function cancelTimeChanges() { closeAllSheets(); }

function confirmDelete() {
    if (!activeWordId) return;
    const [sIdx, wIdx] = activeWordId.split('-').map(Number);
    const seg = state.segs[sIdx];
    
    seg.words.splice(wIdx, 1);
    if (seg.words.length === 0) {
        state.segs.splice(sIdx, 1);
        activeWordId = null;
        document.getElementById('toolbar').classList.remove('show');
    } else {
        seg.text = seg.words.map(w => w.word).join(' ');
        activeWordId = null;
        document.getElementById('toolbar').classList.remove('show');
    }
    
    closeAllSheets();
    renderSegList();
}

function toggleSplit() {
    if (!activeWordId) return;
    const [sIdx, wIdx] = activeWordId.split('-').map(Number);
    
    if (wIdx === 0) {
        if (sIdx > 0) {
            const prevSeg = state.segs[sIdx - 1];
            const currSeg = state.segs[sIdx];
            prevSeg.words = prevSeg.words.concat(currSeg.words);
            prevSeg.end = currSeg.end; 
            prevSeg.text = prevSeg.words.map(w => w.word).join(' ');
            state.segs.splice(sIdx, 1); 
            const newWIdx = prevSeg.words.length - currSeg.words.length;
            renderSegList();
            highlightWord(sIdx - 1, newWIdx, true);
        }
    } else {
        const seg = state.segs[sIdx];
        const wordsFirstHalf = seg.words.slice(0, wIdx);
        const wordsSecondHalf = seg.words.slice(wIdx);
        seg.words = wordsFirstHalf;
        seg.text = seg.words.map(w => w.word).join(' ');
        seg.end = wordsFirstHalf[wordsFirstHalf.length-1].end;
        const newSeg = {
            text: wordsSecondHalf.map(w => w.word).join(' '),
            start: wordsSecondHalf[0].start,
            end: wordsSecondHalf[wordsSecondHalf.length-1].end,
            words: wordsSecondHalf,
            isHidden: false
        };
        state.segs.splice(sIdx + 1, 0, newSeg);
        renderSegList();
        highlightWord(sIdx + 1, 0, true);
    }
}

function updateSplitButton() {
    const btn = document.getElementById('btnSplit');
    if(!activeWordId) { btn.classList.remove('active-state'); return; }
    const [sIdx, wIdx] = activeWordId.split('-').map(Number);
    if (wIdx === 0 && sIdx > 0) {
        btn.classList.add('active-state');
        btn.style.transform = "rotate(180deg)";
    } else {
        btn.classList.remove('active-state');
        btn.style.transform = ""; 
    }
}

function togglePlay() { if(v.paused) { v.play(); togglePlayIcon(true); } else { v.pause(); togglePlayIcon(false); } }
function togglePlayIcon(isPlaying) { const overlay = document.getElementById('playOverlay'); overlay.className = isPlaying ? 'playing' : ''; }

function updateOverlayContent(currentTime) {
    const idx = state.segs.findIndex(s => currentTime >= s.start && currentTime <= s.end); 
    if(idx !== -1) { 
        const seg = state.segs[idx]; 
        if(seg.isHidden) { tEl.style.opacity = 0; } 
        else { 
            tEl.style.opacity = 1; 
            if(state.st.name === 'auto_director' && seg.words) {
                let html = ""; seg.words.forEach((w, i) => {
                    let isActive = (currentTime >= w.start && currentTime <= w.end);
                    let boxColor = (i % 2 === 0) ? '#00D7FF' : '#FF0080'; 
                    if(isActive) html += `<span style="background-color: ${boxColor}; color: #ffffff !important; box-shadow: 0 0 15px ${boxColor}; transform: scale(1.1); display:inline-block; border-radius: 6px; padding: 0 6px; text-shadow:none; font-family: inherit;">${w.word}</span> `;
                    else html += `<span style="color: #ffffff !important; text-shadow:none; font-family: inherit;">${w.word}</span> `;
                }); tEl.innerHTML = html;
            } 
            else if(state.st.name === 'karaoke_static' && seg.words) { 
                let html = ""; seg.words.forEach(w => { 
                    let isActive = (currentTime >= w.start && currentTime <= w.end); let cls = isActive ? "word-active" : ""; 
                    let styleAttr = ""; if(isActive) { let boxColor = state.st.col; styleAttr = `style="background-color: ${boxColor} !important; color: #fff !important; box-shadow: 0 2px 8px ${boxColor};"`; } 
                    html += `<span class="${cls}" ${styleAttr}>${w.word}</span> `; 
                }); tEl.innerHTML = html; 
            } 
            else if (state.st.name === 'progressive_write' && seg.words) { 
                let html = ""; seg.words.forEach(w => { if(currentTime >= w.start) html += `<span style="opacity:1">${w.word}</span> `; else html += `<span style="opacity:0">${w.word}</span> `; }); tEl.innerHTML = html.trim(); 
            } 
            else { tEl.innerText = seg.text; } 
        } 
    } else { tEl.style.opacity = 0; } 
}

function upd() {
    saveProjectToDB();
    state.st.fz = parseInt(document.getElementById('fz').value);
    state.st.y = parseInt(document.getElementById('pos').value);
    if (state.st.name !== 'karaoke_static') state.st.col = document.getElementById('col').value;
    state.st.bg = document.getElementById('bgCol').value;
    let font = 'Vazirmatn';
    if(state.st.f === 'lalezar') font = 'Lalezar'; if(state.st.f === 'bangers') font = 'Impact'; if(state.st.f === 'roboto') font = 'Arial';
    tEl.style.fontFamily = font; tEl.style.fontSize = state.st.fz + 'px'; tEl.style.bottom = state.st.y + 'px'; tEl.style.textAlign = 'center'; tEl.style.left = '50%'; tEl.style.transform = `translateX(calc(-50% + ${state.st.x}px))`; 
    
    tEl.style.paintOrder = 'normal'; tEl.style.webkitPaintOrder = 'normal'; tEl.style.borderRadius = '0px';

    if(state.st.name === 'karaoke_static' || state.st.name === 'auto_director') {
        tEl.style.backgroundColor = 'transparent'; tEl.style.color = '#FFFFFF'; tEl.style.webkitTextStroke = '0px'; tEl.style.textShadow = 'none';
    } else if (state.st.name === 'plain_white') {
        tEl.style.color = '#FFFFFF'; tEl.style.backgroundColor = 'transparent'; tEl.style.webkitTextStroke = '0px'; tEl.style.textShadow = 'none';
    } else if (state.st.name === 'white_outline') {
        tEl.style.color = '#FFFFFF'; tEl.style.backgroundColor = 'transparent'; const s = Math.max(3, state.st.fz / 4.5); tEl.style.webkitTextStroke = `${s}px #000000`; tEl.style.paintOrder = 'stroke fill'; tEl.style.webkitPaintOrder = 'stroke fill'; tEl.style.textShadow = 'none';
    } else {
        tEl.style.color = state.st.col;
        if(state.st.type === 'solid') { tEl.style.backgroundColor = state.st.bg; tEl.style.webkitTextStroke = '0px'; tEl.style.textShadow = 'none'; tEl.style.borderRadius = '12px'; } 
        else if (state.st.type === 'transparent') {
            let c = state.st.bg.replace('#', ''); let r = parseInt(c.substring(0, 2), 16); let g = parseInt(c.substring(2, 4), 16); let b = parseInt(c.substring(4, 6), 16);
            tEl.style.backgroundColor = `rgba(${r},${g},${b},0.6)`; tEl.style.webkitTextStroke = '0px'; tEl.style.textShadow = 'none'; tEl.style.borderRadius = '12px';
        } else if (state.st.type === 'outline') {
            tEl.style.backgroundColor = 'transparent'; tEl.style.color = state.st.col; const s = Math.max(3, state.st.fz / 4.5); tEl.style.webkitTextStroke = `${s}px ${state.st.bg}`; tEl.style.paintOrder = 'stroke fill'; tEl.style.webkitPaintOrder = 'stroke fill'; tEl.style.textShadow = 'none';
        } else { tEl.style.backgroundColor = 'transparent'; tEl.style.webkitTextStroke = '0px'; tEl.style.textShadow = 'none'; }
    }
}

function openStaticColorPicker(event) { event.stopPropagation(); document.getElementById('staticColorPicker').click(); }
function updateStaticColor(val) { document.documentElement.style.setProperty('--static-color', val); state.st.col = val; document.getElementById('col').value = val; upd(); }

function setStylePreset(name, el, skipModeSet = false) { 
    state.st.name = name; 
    document.querySelectorAll('.style-card').forEach(c => c.classList.remove('selected')); 
    if(el) el.classList.add('selected'); 
    
    if(name === 'karaoke_static' && !skipModeSet) { 
        const defaultPurple = '#A020F0'; 
        state.st.col = defaultPurple; 
        document.documentElement.style.setProperty('--static-color', defaultPurple); 
        document.getElementById('staticColorPicker').value = defaultPurple; 
        document.getElementById('col').value = defaultPurple; 
    }
    
    if(name === 'classic' && !skipModeSet) { 
        setMode('solid'); 
    } else if (name === 'progressive_write') {
        setMode('none'); 
    } else if (name === 'plain_white' || name === 'white_outline') { 
        state.st.col = '#FFFFFF'; 
        state.st.bg = '#000000'; 
        document.getElementById('col').value = '#FFFFFF'; 
        document.getElementById('bgCol').value = '#000000'; 
        setMode('outline'); 
    }
    upd(); 
}

function handleClassicDoubleClick(element) {
    event.stopPropagation();
    activateCustomStyle();
    setStylePreset('classic', element, true);
    setMode('none');
}

function setFont(f, el) { document.querySelectorAll('.font-btn').forEach(btn => btn.classList.remove('ticked')); el.classList.add('ticked'); state.st.f = f; upd(); }
function setMode(m) { state.st.type = m; syncModeButtons(); upd(); }