const statusText = document.getElementById('status-text');
const wsIndicator = document.getElementById('ws-indicator');
const searchBtn = document.getElementById('search-btn');
const searchInput = document.getElementById('search-input');
const resultsContainer = document.getElementById('discovery-results');

const dropzone = document.getElementById('dropzone');
const fileInput = document.getElementById('file-input');

const dlBtn = document.getElementById('dl-btn');
const dlUrl = document.getElementById('dl-url');
const dlStart = document.getElementById('dl-start');
const dlEnd = document.getElementById('dl-end');
const confirmModal = document.getElementById('confirm-modal');
const dlConfirmBtn = document.getElementById('dl-confirm-btn');
const dlCancelBtn = document.getElementById('dl-cancel-btn');


// --- WebSocket ---
let ws;
function connectWS() {
    const proto = window.location.protocol === 'https:' ? 'wss' : 'ws';
    const wsUrl = `${proto}://${window.location.host}/ws`;
    // For local dev without docker, port might be 3000
    const finalWsUrl = window.location.port === '' ? `${proto}://${window.location.hostname}:3000/ws` : wsUrl;

    ws = new WebSocket(finalWsUrl);

    ws.onopen = () => {
        wsIndicator.className = 'h-2 w-2 rounded-full bg-green-500';
    };

    ws.onmessage = (event) => {
        statusText.textContent = event.data;
        // flash text
        statusText.classList.add('text-blue-400');
        setTimeout(() => statusText.classList.remove('text-blue-400'), 500);
    };

    ws.onclose = () => {
        wsIndicator.className = 'h-2 w-2 rounded-full bg-red-500';
        setTimeout(connectWS, 2000); // Reconnect
    };
}
connectWS();

// --- Zone A: Search ---
searchBtn.addEventListener('click', async () => {
    const query = searchInput.value.trim();
    if (!query) return;

    searchBtn.disabled = true;
    searchBtn.textContent = '검색 중...';
    resultsContainer.innerHTML = '<div class="col-span-full h-full flex items-center justify-center text-gray-500 animate-pulse">인공지능이 이미지를 탐색하고 선별 중입니다...</div>';

    try {
        const port = window.location.port ? `:${window.location.port}` : ':3000';
        const res = await fetch(`http://${window.location.hostname}${port}/api/search?q=${encodeURIComponent(query)}`);
        const data = await res.json();

        if (data.error) {
            resultsContainer.innerHTML = `<div class="col-span-full text-red-500 p-4">Error: ${data.error}</div>`;
        } else if (data.recommended && data.recommended.length > 0) {
            resultsContainer.innerHTML = '';
            data.recommended.forEach((item, index) => {
                const delay = index * 100;
                resultsContainer.innerHTML += `
                    <div class="recommend-card bg-[#252525] rounded-lg overflow-hidden border border-purple-500/30 hover:border-purple-500 transition-colors cursor-pointer group relative" style="animation-delay: ${delay}ms; opacity:0;">
                        <span class="absolute top-2 left-2 bg-purple-600/90 text-xs px-2 py-1 rounded text-white font-medium backdrop-blur-sm z-10 shadow-lg border border-purple-400/50">✨ AI Recommended</span>
                        <div class="h-32 w-full bg-black overflow-hidden relative">
                            <img src="${item.url}" class="w-full h-full object-cover opacity-80 group-hover:opacity-100 group-hover:scale-105 transition-all duration-300" onerror="this.src='https://via.placeholder.com/300x200?text=Image+Load+Error'" />
                        </div>
                        <div class="p-3">
                            <p class="text-xs text-gray-300 line-clamp-3 leading-relaxed">${item.reason}</p>
                        </div>
                        <a href="${item.url}" target="_blank" class="absolute inset-0"></a>
                    </div>
                `;
            });
        } else {
            resultsContainer.innerHTML = `<div class="col-span-full text-gray-500 p-4">결과를 찾을 수 없습니다.</div>`;
        }
    } catch (err) {
        resultsContainer.innerHTML = `<div class="col-span-full text-red-500 p-4">Exception: ${err.message}</div>`;
    } finally {
        searchBtn.disabled = false;
        searchBtn.textContent = '검색';
    }
});


// --- Zone B: Upload ---
dropzone.addEventListener('dragover', (e) => {
    e.preventDefault();
    dropzone.classList.add('border-purple-500', 'bg-[#303030]');
});

dropzone.addEventListener('dragleave', () => {
    dropzone.classList.remove('border-purple-500', 'bg-[#303030]');
});

dropzone.addEventListener('drop', (e) => {
    e.preventDefault();
    dropzone.classList.remove('border-purple-500', 'bg-[#303030]');
    
    if (e.dataTransfer.files.length > 0) {
        uploadFile(e.dataTransfer.files[0]);
    }
});

dropzone.addEventListener('click', () => fileInput.click());
fileInput.addEventListener('change', (e) => {
    if (e.target.files.length > 0) {
        uploadFile(e.target.files[0]);
    }
});

async function uploadFile(file) {
    const formData = new FormData();
    formData.append('file', file);
    
    statusText.textContent = `Uploading ${file.name}...`;
    
    try {
        const port = window.location.port ? `:${window.location.port}` : ':3000';
        const res = await fetch(`http://${window.location.hostname}${port}/api/upload`, {
            method: 'POST',
            body: formData
        });
        const data = await res.json();
        
        if (data.error) {
            statusText.textContent = `Upload Error: ${data.error}`;
        } else {
            statusText.textContent = `Upload Success: ${data.filename}`;
        }
    } catch (err) {
        statusText.textContent = `Upload Failed: ${err.message}`;
    }
}


// --- Zone C: Download ---
async function requestDownload(confirm = false) {
    const url = dlUrl.value.trim();
    if (!url) return;
    
    dlBtn.disabled = true;
    dlBtn.textContent = '요청 중...';
    
    const payload = {
        url: url,
        start: dlStart.value.trim(),
        end: dlEnd.value.trim()
    };
    
    try {
        const port = window.location.port ? `:${window.location.port}` : ':3000';
        const res = await fetch(`http://${window.location.hostname}${port}/api/download${confirm ? '?confirm=true' : ''}`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(payload)
        });
        
        if (res.status === 409) {
            // Duplicate!
            confirmModal.classList.remove('hidden');
            confirmModal.classList.add('flex');
            dlBtn.disabled = false;
            dlBtn.textContent = '다운로드 시작';
            return;
        }
        
        const data = await res.json();
        if (data.error) {
            statusText.textContent = `Download Error: ${data.error}`;
        } else {
            // The WS will handle the progress
            dlUrl.value = '';
            dlStart.value = '';
            dlEnd.value = '';
            confirmModal.classList.add('hidden');
            confirmModal.classList.remove('flex');
        }
    } catch (err) {
        statusText.textContent = `Download Request Failed: ${err.message}`;
    } finally {
        dlBtn.disabled = false;
        dlBtn.textContent = '다운로드 시작';
    }
}

dlBtn.addEventListener('click', () => requestDownload(false));
dlConfirmBtn.addEventListener('click', () => requestDownload(true));
dlCancelBtn.addEventListener('click', () => {
    confirmModal.classList.add('hidden');
    confirmModal.classList.remove('flex');
});