lucide.createIcons();

async function checkAuth() {
    const r = await fetch('/api/auth/me');
    const d = await r.json();
    const profile = document.getElementById('userProfile');
    const entry = document.getElementById('loginEntryBtn');
    const loginHint = document.getElementById('loginHint');
    const submitBtn = document.getElementById('submitBtn');
    
    if(d.logged_in) {
        if(profile) profile.classList.remove('hidden');
        if(entry) entry.classList.add('hidden');
        if(loginHint) loginHint.classList.add('hidden');
        submitBtn.disabled = false;
        submitBtn.classList.remove('opacity-50', 'cursor-not-allowed');
        const phoneDisp = document.getElementById('userPhoneDisplay');
        if(phoneDisp) phoneDisp.innerText = d.phone;

        // 处理积分显示
        const pointsBadge = document.getElementById('pointsBadge');
        const pointsDisplay = document.getElementById('pointsDisplay');
        if(pointsBadge && pointsDisplay) {
            pointsBadge.classList.remove('hidden');
            pointsDisplay.innerText = d.points;
        }
        const headerPoints = document.getElementById('headerPoints');
        if(headerPoints) headerPoints.innerText = d.points;

        // 如果用户已经有绑定的 Key，且当前没手动输入，则默认切到 Key 模式
        if(d.api_key) {
            switchMode('key');
            const keyInput = document.getElementById('apiKey');
            if(keyInput && !keyInput.value) keyInput.value = d.api_key;
        } else {
            switchMode('trial');
        }
    } else {
        if(profile) profile.classList.add('hidden');
        if(entry) entry.classList.remove('hidden');
        if(loginHint) loginHint.classList.remove('hidden');
        submitBtn.disabled = true;
        submitBtn.classList.add('opacity-50', 'cursor-not-allowed');
    }
    lucide.createIcons();
}

// 移除 redundant logout 监听，因为 base.html 已处理全局登出

// 历史记录分页状态
let currentHistoryPage = 1;
let hasMoreHistory = true;
let isHistoryLoading = false;

// 存储当前生成的所有图片 URL
let currentGeneratedUrls = [];
let currentMode = 'trial'; // 'trial' 或 'key'
let uploadedFiles = []; // 存储当前待上传的参考图

function switchMode(mode) {
    currentMode = mode;
    const trialBtn = document.getElementById('modeTrialBtn');
    const keyBtn = document.getElementById('modeKeyBtn');
    const keyInputGroup = document.getElementById('keyInputGroup');
    const premiumToggle = document.getElementById('premiumToggle');

    if(mode === 'trial') {
        trialBtn.classList.add('border-indigo-500', 'bg-indigo-50', 'text-indigo-600', 'border-2');
        trialBtn.classList.remove('border-slate-200', 'text-slate-400');
        keyBtn.classList.remove('border-indigo-500', 'bg-indigo-50', 'text-indigo-600', 'border-2');
        keyBtn.classList.add('border-slate-200', 'text-slate-400');
        keyInputGroup.classList.add('hidden');
        if(premiumToggle) premiumToggle.classList.remove('hidden');
    } else {
        keyBtn.classList.add('border-indigo-500', 'bg-indigo-50', 'text-indigo-600', 'border-2');
        keyBtn.classList.remove('border-slate-200', 'text-slate-400');
        trialBtn.classList.remove('border-indigo-500', 'bg-indigo-50', 'text-indigo-600', 'border-2');
        trialBtn.classList.add('border-slate-200', 'text-slate-400');
        keyInputGroup.classList.remove('hidden');
        if(premiumToggle) premiumToggle.classList.add('hidden');
    }
    updateCostPreview(); // 切换模式时同步计费预览
}

async function downloadImage(url) {
    try {
        const response = await fetch(url);
        const blob = await response.blob();
        const blobUrl = window.URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = blobUrl;
        // 从 URL 提取文件名
        const filename = url.split('/').pop().split('?')[0] || 'ai-vision-image.png';
        a.download = filename;
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        window.URL.revokeObjectURL(blobUrl);
    } catch (e) {
        console.error('下载失败:', e);
        showToast('下载失败，请尝试右键保存', 'error');
    }
}

async function loadHistory(isLoadMore = false) {
    if (isHistoryLoading || (!hasMoreHistory && isLoadMore)) return;
    
    isHistoryLoading = true;
    if (!isLoadMore) {
        currentHistoryPage = 1;
        document.getElementById('historyList').innerHTML = '';
    }

    const footer = document.getElementById('historyFooter');
    footer.classList.remove('hidden');

    try {
        const r = await fetch(`/api/history?page=${currentHistoryPage}&per_page=10`);
        const d = await r.json();
        
        const list = document.getElementById('historyList');
        
        if (d.history && d.history.length > 0) {
            const html = d.history.map(item => `
                <div class="bg-white border border-slate-100 rounded-2xl p-4 space-y-3 hover:border-indigo-100 transition-all shadow-sm group">
                    <div class="flex items-center justify-between">
                        <span class="text-[10px] font-black text-slate-400 bg-slate-50 px-2 py-0.5 rounded-md uppercase tracking-widest">${item.time}</span>
                        <span class="text-[10px] font-bold text-indigo-500">${item.model}</span>
                    </div>
                    <div class="grid grid-cols-3 gap-2">
                        ${item.urls.map(u => `
                            <div class="aspect-square rounded-lg overflow-hidden border border-slate-100 cursor-pointer transition-transform hover:scale-105" onclick="window.open('${u.url}')">
                                <img src="${u.thumb}" class="w-full h-full object-cover" loading="lazy">
                            </div>
                        `).join('')}
                    </div>
                </div>
            `).join('');

            if (isLoadMore) {
                list.insertAdjacentHTML('beforeend', html);
            } else {
                list.innerHTML = html;
            }
            
            hasMoreHistory = d.has_next;
            currentHistoryPage++;
        } else if (!isLoadMore) {
            list.innerHTML = `<div class="flex flex-col items-center justify-center h-64 text-slate-300">
                <i data-lucide="inbox" class="w-12 h-12 mb-4"></i>
                <span class="text-xs font-bold">暂无生成记录</span>
            </div>`;
        }
        lucide.createIcons();
    } catch (e) {
        console.error('加载历史失败:', e);
        if (!isLoadMore) {
            document.getElementById('historyList').innerHTML = `<div class="text-center text-rose-400 text-xs font-bold py-10">加载失败: ${e.message}</div>`;
        }
    } finally {
        isHistoryLoading = false;
        footer.classList.add('hidden');
    }
}

async function init() {
    checkAuth();
    
    // 模式切换监听
    const modeTrialBtn = document.getElementById('modeTrialBtn');
    const modeKeyBtn = document.getElementById('modeKeyBtn');
    const isPremiumCheckbox = document.getElementById('isPremium');
    if(modeTrialBtn) modeTrialBtn.onclick = () => switchMode('trial');
    if(modeKeyBtn) modeKeyBtn.onclick = () => switchMode('key');
    if(isPremiumCheckbox) isPremiumCheckbox.onchange = () => updateCostPreview();

    // 历史记录控制
    const historyDrawer = document.getElementById('historyDrawer');
    const showHistoryBtn = document.getElementById('showHistoryBtn');
    const closeHistoryBtn = document.getElementById('closeHistoryBtn');
    const historyList = document.getElementById('historyList');

    if(showHistoryBtn) {
        showHistoryBtn.onclick = () => {
            historyDrawer.classList.remove('translate-x-full');
            loadHistory(false);
        };
    }
    if(closeHistoryBtn) {
        closeHistoryBtn.onclick = () => {
            historyDrawer.classList.add('translate-x-full');
        };
    }

    // 瀑布流滚动加载
    if (historyList) {
        historyList.onscroll = () => {
            const threshold = 100;
            if (historyList.scrollTop + historyList.clientHeight >= historyList.scrollHeight - threshold) {
                loadHistory(true);
            }
        };
    }

    // 全部下载按钮逻辑
    const downloadAllBtn = document.getElementById('downloadAllBtn');
    if(downloadAllBtn) {
        downloadAllBtn.onclick = async () => {
            if(currentGeneratedUrls.length === 0) return;
            showToast(`正在准备下载 ${currentGeneratedUrls.length} 张作品...`, 'info');
            for(const url of currentGeneratedUrls) {
                await downloadImage(url);
                // 稍微延迟一下，防止浏览器拦截
                await new Promise(r => setTimeout(r, 300));
            }
        };
    }

    // 重新生成按钮逻辑
    const regenBtn = document.getElementById('regenBtn');
    if(regenBtn) {
        regenBtn.onclick = () => {
            const submitBtn = document.getElementById('submitBtn');
            if(submitBtn) submitBtn.click();
        };
    }
    
    // 检查是否有来自 URL 的错误提示
    const urlParams = new URLSearchParams(window.location.search);
    if(urlParams.has('error')) {
        showToast(urlParams.get('error'), 'error');
        // 清理 URL 参数以防刷新时重复提示
        window.history.replaceState({}, document.title, window.location.pathname);
    }

    try {
        const r = await fetch('/api/config');
        const d = await r.json();
        fillSelect('modelSelect', d.models);
        fillSelect('ratioSelect', d.ratios);
        fillSelect('sizeSelect', d.sizes);
        fillSelect('promptTpl', [{label:'✨ 自定义创作', value:'manual'}, ...d.prompts]);
        updateCostPreview(); // 初始化时显示默认模型的积分
    } catch(e) { console.error(e); }

    // 初始化拖拽排序
    const prev = document.getElementById('imagePreview');
    if(prev) {
        new Sortable(prev, {
            animation: 150,
            ghostClass: 'opacity-50',
            onEnd: function (evt) {
                // 拖拽结束，重新对 uploadedFiles 排序
                const oldIndex = evt.oldIndex;
                const newIndex = evt.newIndex;
                const movedFile = uploadedFiles.splice(oldIndex, 1)[0];
                uploadedFiles.splice(newIndex, 0, movedFile);
                // 重新渲染以更新“图1/图2/图3”标签
                renderImagePreviews();
            }
        });
    }
}

function fillSelect(id, list) {
    const el = document.getElementById(id);
    if(!el) return;
    // 如果是模型选择，增加积分显示
    if(id === 'modelSelect') {
        el.innerHTML = list.map(i => `<option value="${i.value}" data-cost="${i.cost || 0}">${i.label} (${i.cost || 0}积分)</option>`).join('');
    } else {
        el.innerHTML = list.map(i => `<option value="${i.value}">${i.label}</option>`).join('');
    }
}

// 更新计费预览显示
function updateCostPreview() {
    const modelSelect = document.getElementById('modelSelect');
    const costPreview = document.getElementById('costPreview');
    const isPremium = document.getElementById('isPremium')?.checked || false;
    const selectedOption = modelSelect.options[modelSelect.selectedIndex];
    
    if (currentMode === 'trial' && selectedOption) {
        let cost = parseInt(selectedOption.getAttribute('data-cost') || 0);
        if(isPremium) cost *= 2; // 优质模式 2 倍积分
        costPreview.innerText = `本次生成将消耗 ${cost} 积分`;
        costPreview.classList.remove('hidden');
    } else {
        costPreview.classList.add('hidden');
    }
}

// 渲染参考图预览
function renderImagePreviews() {
    const prev = document.getElementById('imagePreview');
    if(!prev) return;
    prev.innerHTML = '';
    
    uploadedFiles.forEach((file, index) => {
        // 同步创建容器，确保编号顺序永远正确
        const d = document.createElement('div');
        d.className = 'relative w-20 h-20 rounded-2xl overflow-hidden flex-shrink-0 border-2 border-white shadow-md group cursor-move';
        d.setAttribute('data-index', index);
        d.innerHTML = `
            <div class="w-full h-full bg-slate-100 animate-pulse flex items-center justify-center">
                <i data-lucide="image" class="w-5 h-5 text-slate-300"></i>
            </div>
            <div class="absolute bottom-1 left-1 bg-black/60 text-white text-[8px] px-1.5 py-0.5 rounded-md font-black backdrop-blur-sm z-10">图${index + 1}</div>
            <button onclick="removeUploadedFile(${index})" class="absolute top-1 right-1 bg-rose-500 text-white p-1 rounded-full opacity-0 group-hover:opacity-100 transition-opacity flex items-center justify-center z-20">
                <i data-lucide="x" class="w-3 h-3"></i>
            </button>
        `;
        prev.appendChild(d);
        
        // 异步加载图片内容
        const reader = new FileReader();
        reader.onload = (ev) => {
            d.innerHTML = `
                <img src="${ev.target.result}" class="w-full h-full object-cover">
                <div class="absolute bottom-1 left-1 bg-black/60 text-white text-[8px] px-1.5 py-0.5 rounded-md font-black backdrop-blur-sm z-10">图${index + 1}</div>
                <button onclick="removeUploadedFile(${index})" class="absolute top-1 right-1 bg-rose-500 text-white p-1 rounded-full opacity-0 group-hover:opacity-100 transition-opacity flex items-center justify-center z-20">
                    <i data-lucide="x" class="w-3 h-3"></i>
                </button>
            `;
            lucide.createIcons();
        };
        reader.readAsDataURL(file);
    });
    lucide.createIcons();
}

function removeUploadedFile(index) {
    uploadedFiles.splice(index, 1);
    renderImagePreviews();
}

// 统一处理新上传/粘贴/拖入的文件
function handleNewFiles(files) {
    const newFiles = Array.from(files).filter(f => f.type.startsWith('image/'));
    if (newFiles.length === 0) return;

    if (uploadedFiles.length + newFiles.length > 3) {
        showToast('最多只能上传 3 张参考图', 'warning');
        const remaining = 3 - uploadedFiles.length;
        if (remaining > 0) {
            uploadedFiles = uploadedFiles.concat(newFiles.slice(0, remaining));
        }
    } else {
        uploadedFiles = uploadedFiles.concat(newFiles);
    }
    renderImagePreviews();
}

document.getElementById('fileInput').onchange = (e) => {
    handleNewFiles(e.target.files);
    e.target.value = ''; // 重置以允许重复选择同一文件
};

// 拖拽上传逻辑
const dropZone = document.getElementById('dropZone');
if (dropZone) {
    ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(name => {
        dropZone.addEventListener(name, (e) => {
            e.preventDefault();
            e.stopPropagation();
        }, false);
    });

    ['dragenter', 'dragover'].forEach(name => {
        dropZone.addEventListener(name, () => dropZone.classList.add('border-indigo-500', 'bg-indigo-50/50'), false);
    });

    ['dragleave', 'drop'].forEach(name => {
        dropZone.addEventListener(name, () => dropZone.classList.remove('border-indigo-500', 'bg-indigo-50/50'), false);
    });

    dropZone.addEventListener('drop', (e) => {
        handleNewFiles(e.dataTransfer.files);
    }, false);
}

// 粘贴上传逻辑
document.addEventListener('paste', (e) => {
    const items = (e.clipboardData || e.originalEvent.clipboardData).items;
    const files = [];
    for (let item of items) {
        if (item.type.indexOf('image') !== -1) {
            files.push(item.getAsFile());
        }
    }
    if (files.length > 0) {
        handleNewFiles(files);
    }
});

document.getElementById('modelSelect').onchange = (e) => {
    document.getElementById('sizeGroup').classList.toggle('hidden', e.target.value !== 'nano-banana-2');
    updateCostPreview(); // 切换模型时更新计费预览
};

document.getElementById('promptTpl').onchange = (e) => {
    const area = document.getElementById('manualPrompt');
    if(e.target.value !== 'manual') {
        area.value = e.target.value;
        area.classList.add('hidden');
    } else {
        area.value = '';
        area.classList.remove('hidden');
    }
};

document.getElementById('submitBtn').onclick = async () => {
    const btn = document.getElementById('submitBtn');
    const prompt = document.getElementById('manualPrompt').value;
    const apiKey = document.getElementById('apiKey').value;
    const num = parseInt(document.getElementById('numSelect').value);

    // 检查登录状态并获取积分
    const authCheck = await fetch('/api/auth/me');
    const authData = await authCheck.json();
    if(!authData.logged_in) {
        showToast('请先登录后再生成作品', 'warning');
        return;
    }

    // 根据模式验证
    if(currentMode === 'key') {
        if(!apiKey) return showToast('请输入您的 API 密钥', 'warning');
    } else {
        if(authData.points <= 0) return showToast('可用积分已耗尽，请充值或切换至自定义 Key 模式', 'warning');
    }
    
    // 允许文生图（不强制要求图片），但至少得有提示词或图片
    if(!prompt && uploadedFiles.length === 0) {
        return showToast('请至少输入提示词或上传参考图', 'warning');
    }

    // UI 锁定
    btn.disabled = true;
    const btnText = btn.querySelector('span');
    btnText.innerText = uploadedFiles.length > 0 ? "正在同步参考图..." : "正在开启 AI 引擎...";
    
    document.getElementById('statusInfo').classList.remove('hidden');
    document.getElementById('placeholder').classList.add('hidden');
    document.getElementById('finalWrapper').classList.remove('hidden');
    const grid = document.getElementById('imageGrid');
    grid.innerHTML = ''; // 清空
    currentGeneratedUrls = []; // 重置当前生成列表

    try {
        let image_urls = [];
        
        // 1. 如果有图则先上传
        if (uploadedFiles.length > 0) {
            const uploadData = new FormData();
            for(let f of uploadedFiles) uploadData.append('images', f);
            const upR = await fetch('/api/upload', { method: 'POST', body: uploadData });
            const upRes = await upR.json();
            if(upRes.error) throw new Error(upRes.error);
            image_urls = upRes.urls;
        }

        // 2. 并行启动多个生成任务
        btnText.innerText = `AI 构思中 (0/${num})...`;
        let finishedCount = 0;

        const startTask = async (index) => {
            const slot = document.createElement('div');
            slot.className = 'image-frame relative bg-white/50 animate-pulse min-h-[300px] flex items-center justify-center rounded-[2.5rem] border border-slate-100 shadow-sm';
            slot.innerHTML = `<div class="text-slate-400 text-xs font-bold italic">正在创作第 ${index + 1} 张...</div>`;
            grid.appendChild(slot);

            try {
                const r = await fetch('/api/generate', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({
                        mode: currentMode,
                        is_premium: document.getElementById('isPremium')?.checked || false,
                        apiKey: currentMode === 'key' ? apiKey : '',
                        prompt: document.getElementById('manualPrompt').value,
                        model: document.getElementById('modelSelect').value,
                        ratio: document.getElementById('ratioSelect').value,
                        size: document.getElementById('sizeSelect').value,
                        image_urls
                    })
                });
                const res = await r.json();
                if(res.error) throw new Error(res.error);

                if(res.message) showToast(res.message, 'success');

                const imgUrl = res.data[0].url;
                currentGeneratedUrls.push(imgUrl);
                
                slot.className = 'image-frame group relative animate-in zoom-in-95 duration-700';
                slot.innerHTML = `
                    <img src="${imgUrl}" class="w-full h-auto rounded-[2.5rem] object-contain shadow-xl">
                    <div class="absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity bg-black/20 rounded-[2.5rem]">
                        <button onclick="downloadImage('${imgUrl}')" class="bg-white/90 p-4 rounded-full text-indigo-600 shadow-xl hover:scale-110 transition-transform">
                            <i data-lucide="download-cloud" class="w-6 h-6"></i>
                        </button>
                    </div>
                `;
                lucide.createIcons();
            } catch (e) {
                slot.className = 'image-frame relative bg-red-50/50 flex items-center justify-center rounded-[2.5rem] border border-red-100 p-6';
                if(e.message.includes('401') || e.message.includes('请先登录')) {
                    slot.innerHTML = `<div class="text-red-400 text-[10px] font-bold text-center">登录已过期，请重新登录</div>`;
                } else {
                    slot.innerHTML = `<div class="text-red-400 text-[10px] font-bold text-center">渲染异常: ${e.message}</div>`;
                }
            } finally {
                finishedCount++;
                btnText.innerText = `AI 构思中 (${finishedCount}/${num})...`;
                // 每次生成任务结束后，刷新一次积分显示
                if(currentMode === 'trial') checkAuth();
            }
        };

        const tasks = Array.from({ length: num }, (_, i) => startTask(i));
        await Promise.all(tasks);

    } catch (e) {
        showToast('创作引擎中断: ' + e.message, 'error');
        document.getElementById('placeholder').classList.remove('hidden');
    } finally {
        btn.disabled = false;
        btnText.innerText = "立即生成作品";
        document.getElementById('statusInfo').classList.add('hidden');
    }
};

init();

// 修改密码弹窗控制
function openPwdModal() {
    const modal = document.getElementById('pwdModal');
    if(!modal) return;
    modal.classList.remove('hidden');
    setTimeout(() => {
        modal.classList.add('opacity-100');
        modal.querySelector('div').classList.remove('scale-95');
    }, 10);
}

function closePwdModal() {
    const modal = document.getElementById('pwdModal');
    if(!modal) return;
    modal.classList.remove('opacity-100');
    modal.querySelector('div').classList.add('scale-95');
    setTimeout(() => {
        modal.classList.add('hidden');
        document.getElementById('pwdForm').reset();
    }, 300);
}

document.addEventListener('click', (e) => {
    if(e.target.closest('#openPwdModalBtn')) {
        openPwdModal();
    }
});

document.getElementById('pwdForm')?.addEventListener('submit', async (e) => {
    e.preventDefault();
    const old_password = document.getElementById('oldPwd').value;
    const new_password = document.getElementById('newPwd').value;
    
    try {
        const r = await fetch('/api/auth/change_password', {
            method: 'POST',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify({old_password, new_password})
        });
        const d = await r.json();
        if(r.ok) {
            showToast('密码修改成功，请记牢新密码', 'success');
            closePwdModal();
        } else {
            showToast(d.error || '修改失败', 'error');
        }
    } catch(err) {
        showToast('网络连接失败', 'error');
    }
});