class DownloadManager {
    constructor() {
        this.port = window.location.port || '55830';
        this.baseUrl = `http://127.0.0.1:${this.port}/api`;
        this.currentDownload = null;

        this.init();
    }

    init() {
        document.getElementById('port').textContent = this.port;

        // 绑定事件
        document.getElementById('reloadBtn').addEventListener('click', () => this.reloadFolders());
        document.getElementById('cleanupBtn').addEventListener('click', () => this.cleanupJson());
        document.getElementById('closeModalBtn').addEventListener('click', () => this.hideModal());
        document.querySelector('.close-btn').addEventListener('click', () => this.hideModal());

        // 点击模态框外部关闭
        document.getElementById('downloadModal').addEventListener('click', (e) => {
            if (e.target === document.getElementById('downloadModal')) {
                this.hideModal();
            }
        });

        // 初始加载
        this.reloadFolders();
    }

    showStatus(message, type = 'info') {
        const statusEl = document.getElementById('statusMessage');
        statusEl.textContent = message;
        statusEl.style.borderLeftColor = type === 'error' ? '#ef4444' :
            type === 'warning' ? '#f59e0b' : '#10b981';
    }

    showModal(title) {
        document.getElementById('modalTitle').textContent = title;
        document.getElementById('downloadModal').style.display = 'flex';
        this.resetModal();
    }

    hideModal() {
        document.getElementById('downloadModal').style.display = 'none';
        if (this.currentDownload && this.currentDownload.abort) {
            this.currentDownload.abort();
        }
    }

    resetModal() {
        document.getElementById('progressBar').style.width = '0%';
        document.getElementById('progressText').textContent = '0%';
        document.getElementById('totalFiles').textContent = '0';
        document.getElementById('downloadedFiles').textContent = '0';
        document.getElementById('pendingFiles').textContent = '0';
        document.getElementById('downloadLog').innerHTML = '';
    }

    updateProgress(progress, stats) {
        document.getElementById('progressBar').style.width = `${progress}%`;
        document.getElementById('progressText').textContent = `${Math.round(progress)}%`;

        if (stats) {
            document.getElementById('totalFiles').textContent = stats.total || 0;
            document.getElementById('downloadedFiles').textContent = stats.downloaded || 0;
            document.getElementById('pendingFiles').textContent = stats.pending || 0;
        }
    }

    addLogEntry(message, type = 'info') {
        const logEl = document.getElementById('downloadLog');
        const entry = document.createElement('div');
        entry.className = `log-entry ${type}`;
        entry.textContent = `[${new Date().toLocaleTimeString()}] ${message}`;
        logEl.appendChild(entry);
        logEl.scrollTop = logEl.scrollHeight;
    }

    async reloadFolders() {
        try {
            this.showStatus('正在加载文件夹...', 'info');
            document.getElementById('reloadBtn').disabled = true;

            const response = await fetch(`${this.baseUrl}/reload_folders`);
            const data = await response.json();

            if (data.success) {
                this.displayFolders(data.folders);
                this.showStatus(`已加载 ${data.folders.length} 个未完成的任务`, 'success');
            } else {
                throw new Error(data.message || '加载失败');
            }
        } catch (error) {
            console.error('加载失败:', error);
            this.showStatus(`加载失败: ${error.message}`, 'error');
            this.displayFolders([]);
        } finally {
            document.getElementById('reloadBtn').disabled = false;
        }
    }

    displayFolders(folders) {
        const foldersList = document.getElementById('foldersList');
        const noFolders = document.getElementById('noFolders');

        // 过滤掉进度为100%的文件夹
        const incompleteFolders = folders.filter(folder => folder.progress < 100);

        if (incompleteFolders.length === 0) {
            foldersList.innerHTML = '';
            noFolders.style.display = 'block';
            return;
        }

        noFolders.style.display = 'none';

        foldersList.innerHTML = incompleteFolders.map(folder => `
        <div class="folder-item">
            <div class="folder-info">
                <div class="folder-title">
                    <i class="fas fa-book"></i>
                    ${this.escapeHtml(folder.title)}
                </div>
                <div class="folder-stats">
                    <span>总文件: ${folder.total}</span>
                    <span>已下载: ${folder.downloaded}</span>
                    <span>缺失: ${folder.total - folder.downloaded}</span>
                </div>
                <div class="progress-container">
                    <div class="progress-wrapper">
                        <div class="progress">
                            <div class="progress-fill" style="width: ${folder.progress}%"></div>
                        </div>
                        <div class="progress-text">${folder.progress.toFixed(1)}%</div>
                    </div>
                </div>
            </div>
            <div class="folder-actions">
                <button class="btn btn-primary btn-small" onclick="downloadManager.downloadFolder('${this.escapeAttr(folder.folder)}', '${this.escapeAttr(folder.title)}')">
                    <i class="fas fa-download"></i> 下载缺失文件 (${folder.total - folder.downloaded})
                </button>
            </div>
        </div>
    `).join('');
    }

    async downloadFolder(folderPath, title) {
        try {
            this.showModal(`正在下载: ${title}`);
            this.addLogEntry('开始下载缺失文件...', 'info');

            console.log('发送请求:', { folder: folderPath, title: title });

            const response = await fetch(`${this.baseUrl}/download_missing`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    folder: folderPath,
                    title: title
                })
            });

            // 检查响应状态
            if (!response.ok) {
                const errorText = await response.text();
                console.error('HTTP错误:', response.status, errorText);
                throw new Error(`HTTP ${response.status}: ${errorText}`);
            }

            const data = await response.json();
            console.log('收到响应:', data);

            if (data.success) {
                // 更新进度
                const totalSaved = (data.saved || 0) + (data.skipped || 0);
                const total = data.total || 1;
                const progress = totalSaved / total * 100;

                this.updateProgress(progress, {
                    total: total,
                    downloaded: totalSaved,
                    pending: data.failed || 0
                });

                // 添加日志
                if (data.details) {
                    data.details.forEach(detail => {
                        if (detail.status === 'success') {
                            this.addLogEntry(`成功下载: ${detail.key}`, 'success');
                        } else if (detail.status === 'failed') {
                            this.addLogEntry(`下载失败 ${detail.key}: ${detail.message}`, 'error');
                        } else if (detail.status === 'skipped') {
                            this.addLogEntry(`跳过: ${detail.key} (${detail.message})`, 'info');
                        }
                    });
                }

                this.addLogEntry(`下载完成: ${data.message}`, 'success');

                // 刷新文件夹列表
                setTimeout(() => this.reloadFolders(), 1000);
            } else {
                this.addLogEntry(`下载失败: ${data.message}`, 'error');
            }
        } catch (error) {
            console.error('下载失败:', error);
            this.addLogEntry(`下载失败: ${error.message}`, 'error');
        }
    }

    async cleanupJson() {
        if (!confirm('确定要删除所有JSON文件吗？此操作不可恢复。')) {
            return;
        }

        try {
            this.showStatus('正在清理JSON文件...', 'info');
            document.getElementById('cleanupBtn').disabled = true;

            const response = await fetch(`${this.baseUrl}/cleanup_json`, {
                method: 'POST'
            });

            const data = await response.json();

            if (data.success) {
                this.showStatus(data.message, 'success');
                // 刷新文件夹列表
                setTimeout(() => this.reloadFolders(), 500);
            } else {
                throw new Error(data.message || '清理失败');
            }
        } catch (error) {
            console.error('清理失败:', error);
            this.showStatus(`清理失败: ${error.message}`, 'error');
        } finally {
            document.getElementById('cleanupBtn').disabled = false;
        }
    }

    escapeHtml(text) {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }

    escapeAttr(text) {
        return this.escapeHtml(text).replace(/"/g, '&quot;');
    }
}

// 初始化应用
const downloadManager = new DownloadManager();