#!/usr/bin/env node
/**
 * 下载 Epic 免费游戏图片到本地
 * 运行方式: node scripts/download-epic-images.mjs
 */

import fs from 'fs'
import path from 'path'
import https from 'https'
import http from 'http'
import { fileURLToPath } from 'url'

const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)

const EPIC_API_URL = 'https://uapis.cn/api/v1/game/epic-free'
const OUTPUT_DIR = path.join(__dirname, '../public/epic-images')
const MANIFEST_PATH = path.join(OUTPUT_DIR, 'manifest.json')

// 发起 HTTPS GET 请求获取 JSON
function fetchJson(url) {
    return new Promise((resolve, reject) => {
        https.get(url, (response) => {
            if (response.statusCode >= 300 && response.statusCode < 400 && response.headers.location) {
                fetchJson(response.headers.location).then(resolve).catch(reject)
                return
            }

            if (response.statusCode !== 200) {
                reject(new Error(`HTTP ${response.statusCode}`))
                return
            }

            let data = ''
            response.on('data', chunk => data += chunk)
            response.on('end', () => {
                try {
                    resolve(JSON.parse(data))
                } catch (e) {
                    reject(e)
                }
            })
        }).on('error', reject)
    })
}

// 确保输出目录存在
function ensureDir(dir) {
    if (!fs.existsSync(dir)) {
        fs.mkdirSync(dir, { recursive: true })
        console.log(`📁 Created directory: ${dir}`)
    }
}

// 下载文件
function downloadFile(url, destPath) {
    return new Promise((resolve, reject) => {
        const protocol = url.startsWith('https') ? https : http

        const request = protocol.get(url, (response) => {
            // 处理重定向
            if (response.statusCode >= 300 && response.statusCode < 400 && response.headers.location) {
                downloadFile(response.headers.location, destPath).then(resolve).catch(reject)
                return
            }

            if (response.statusCode !== 200) {
                reject(new Error(`Failed to download ${url}: ${response.statusCode}`))
                return
            }

            const fileStream = fs.createWriteStream(destPath)
            response.pipe(fileStream)

            fileStream.on('finish', () => {
                fileStream.close()
                resolve()
            })

            fileStream.on('error', (err) => {
                fs.unlink(destPath, () => { }) // 删除失败的文件
                reject(err)
            })
        })

        request.on('error', reject)
        request.setTimeout(30000, () => {
            request.destroy()
            reject(new Error(`Timeout downloading ${url}`))
        })
    })
}

// 获取文件扩展名
function getExtension(url) {
    const match = url.match(/\.(\w+)(?:\?|$)/)
    return match ? `.${match[1]}` : '.jpg'
}

// 生成安全的文件名
function safeFileName(id, url) {
    const ext = getExtension(url)
    return `${id}${ext}`
}

// 主函数
async function main() {
    console.log('🎮 开始下载 Epic 免费游戏图片...\n')

    // 获取 Epic API 数据
    console.log('📡 正在获取 Epic API 数据...')
    const result = await fetchJson(EPIC_API_URL)

    if (!result.data || !Array.isArray(result.data)) {
        console.error('❌ API 返回数据格式错误')
        process.exit(1)
    }

    // 过滤掉神秘游戏
    const games = result.data.filter(game => !game.title.includes('神秘游戏'))
    console.log(`📋 找到 ${games.length} 个游戏\n`)

    // 确保输出目录存在
    ensureDir(OUTPUT_DIR)

    // 下载每个游戏的封面图片
    const manifest = {}

    for (const game of games) {
        if (!game.cover) {
            console.log(`⚠️  跳过 ${game.title}: 无封面图片`)
            continue
        }

        const fileName = safeFileName(game.id, game.cover)
        const destPath = path.join(OUTPUT_DIR, fileName)

        // 检查文件是否已存在
        if (fs.existsSync(destPath)) {
            console.log(`✅ 已存在: ${game.title} (${fileName})`)
            manifest[game.id] = `/epic-images/${fileName}`
            continue
        }

        try {
            console.log(`⬇️  下载中: ${game.title}...`)
            await downloadFile(game.cover, destPath)
            console.log(`✅ 完成: ${game.title} (${fileName})`)
            manifest[game.id] = `/epic-images/${fileName}`
        } catch (error) {
            console.error(`❌ 失败: ${game.title} - ${error.message}`)
            // 失败时保留原始 URL
            manifest[game.id] = game.cover
        }
    }

    // 保存 manifest 文件
    fs.writeFileSync(MANIFEST_PATH, JSON.stringify(manifest, null, 2))
    console.log(`\n📄 Manifest 已保存到: ${MANIFEST_PATH}`)
    console.log('🎉 完成!')
}

main().catch(console.error)