import fs from 'fs/promises';
import path from 'path';

const DEBUG_DIR = 'debug';

// 确保调试目录存在
async function ensureDebugDir() {
    try {
        await fs.access(DEBUG_DIR);
    } catch {
        await fs.mkdir(DEBUG_DIR, { recursive: true });
    }
}

// 保存截图
export async function saveScreenshot(debugId: string, screenshot: Buffer): Promise<void> {
    await ensureDebugDir();
    const screenshotPath = path.join(DEBUG_DIR, `${debugId}.png`);
    await fs.writeFile(screenshotPath, screenshot);
}

// 保存调试信息
export async function saveDebugInfo(debugId: string, info: any): Promise<void> {
    await ensureDebugDir();
    const infoPath = path.join(DEBUG_DIR, `${debugId}.json`);
    await fs.writeFile(infoPath, JSON.stringify(info, null, 2));
}

// 保存错误信息
export async function saveErrorInfo(debugId: string, error: any): Promise<void> {
    await ensureDebugDir();
    const errorPath = path.join(DEBUG_DIR, `${debugId}_error.json`);
    await fs.writeFile(errorPath, JSON.stringify(error, null, 2));
}

// 获取所有调试信息
export async function getAllDebugInfo(): Promise<any[]> {
    try {
        await ensureDebugDir();
        const files = await fs.readdir(DEBUG_DIR);
        const debugItems = [];

        // 获取所有 .json 文件（排除 _error.json）
        const infoFiles = files.filter(file => file.endsWith('.json') && !file.endsWith('_error.json'));

        for (const file of infoFiles) {
            try {
                const debugId = file.replace('.json', '');
                const infoPath = path.join(DEBUG_DIR, file);
                const errorPath = path.join(DEBUG_DIR, `${debugId}_error.json`);
                const screenshotPath = path.join(DEBUG_DIR, `${debugId}.png`);

                // 读取基本信息
                const infoData = await fs.readFile(infoPath, 'utf-8');
                const info = JSON.parse(infoData);

                // 检查是否有错误信息
                let errorInfo = null;
                try {
                    const errorData = await fs.readFile(errorPath, 'utf-8');
                    errorInfo = JSON.parse(errorData);
                } catch {
                    // 没有错误文件，忽略
                }

                // 检查是否有截图
                let hasScreenshot = false;
                try {
                    await fs.access(screenshotPath);
                    hasScreenshot = true;
                } catch {
                    // 没有截图文件，忽略
                }

                debugItems.push({
                    debugId,
                    ...info,
                    hasError: !!errorInfo,
                    errorMessage: errorInfo?.error || null,
                    hasScreenshot,
                    screenshotUrl: hasScreenshot ? `/api/debug/screenshot?id=${debugId}` : null
                });
            } catch (error) {
                console.error(`Error reading debug file ${file}:`, error);
            }
        }

        // 按时间戳排序（最新的在前）
        debugItems.sort((a, b) => new Date(b.timestamp).getTime() - new Date(a.timestamp).getTime());

        return debugItems;
    } catch (error) {
        console.error('Error reading debug directory:', error);
        return [];
    }
}

// 获取截图
export async function getScreenshot(debugId: string): Promise<Buffer | null> {
    try {
        const screenshotPath = path.join(DEBUG_DIR, `${debugId}.png`);
        return await fs.readFile(screenshotPath);
    } catch {
        return null;
    }
}

// 清理旧的调试文件
export async function cleanupOldDebugFiles(daysToKeep: number = 7): Promise<number> {
    try {
        await ensureDebugDir();
        const files = await fs.readdir(DEBUG_DIR);
        const cutoffTime = Date.now() - (daysToKeep * 24 * 60 * 60 * 1000);
        let deletedCount = 0;

        for (const file of files) {
            try {
                const filePath = path.join(DEBUG_DIR, file);
                const stats = await fs.stat(filePath);
                
                if (stats.mtime.getTime() < cutoffTime) {
                    await fs.unlink(filePath);
                    deletedCount++;
                }
            } catch (error) {
                console.error(`Error processing file ${file}:`, error);
            }
        }

        return deletedCount;
    } catch (error) {
        console.error('Error cleaning up debug files:', error);
        return 0;
    }
}