package main

// 已废弃：请改用按英文 SKU 同步到 frontend/public/images/products/{sku}.webp
//
//	cd backend && go run ./cmd/sync_product_images
//
// 本命令仍会把乐玩缩略图缓存到 data/uploads/products/{uuid}.webp，仅作历史兼容。

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"time"

	"affiliate_dash/internal/config"
	"affiliate_dash/internal/pkg/lewan"
)

func main() {
	cfg := config.Load()
	client := lewan.NewClient(lewan.Config{
		BaseURL:       cfg.LewanBaseURL,
		AccessKey:     cfg.LewanAccessKey,
		SecretKey:     cfg.LewanSecretKey,
		ApplicationID: cfg.LewanApplicationID,
	}, nil)

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	list, err := client.ListProducts(ctx, 1, 100, "")
	if err != nil {
		fmt.Printf("ListProducts error: %v\n", err)
		return
	}

	fmt.Printf("Found %d products (total: %d)\n", len(list.Items), list.Total)
	uploadDir := cfg.UploadDir
	if uploadDir == "" {
		uploadDir = "data/uploads"
	}
	cacheDir := filepath.Join(uploadDir, "products")
	_ = os.MkdirAll(cacheDir, 0755)

	httpClient := &http.Client{Timeout: 15 * time.Second}

	for i, item := range list.Items {
		fmt.Printf("[%d/%d] ID: %s, Name: %s, Thumb: %s\n", i+1, len(list.Items), item.ID, item.Name, item.ThumbnailUrl)
		if item.ThumbnailUrl == "" {
			continue
		}
		// 存储为 item.ID + 原扩展名
		ext := filepath.Ext(item.ThumbnailUrl)
		if ext == "" || len(ext) > 5 {
			ext = ".webp"
		}
		destPath := filepath.Join(cacheDir, item.ID+ext)
		// 同时也用 url hash 存一个软链或备份，以便 proxy 按 url 精准命中
		urlHash := sha256.Sum256([]byte(item.ThumbnailUrl))
		hashPath := filepath.Join(cacheDir, hex.EncodeToString(urlHash[:])+ext)

		if _, err := os.Stat(destPath); err == nil {
			fmt.Printf("   -> 已存在缓存: %s\n", destPath)
			continue
		}

		req, err := http.NewRequestWithContext(ctx, http.MethodGet, item.ThumbnailUrl, nil)
		if err != nil {
			fmt.Printf("   -> 构建请求失败: %v\n", err)
			continue
		}
		resp, err := httpClient.Do(req)
		if err != nil {
			fmt.Printf("   -> 下载失败: %v\n", err)
			continue
		}
		if resp.StatusCode != http.StatusOK {
			fmt.Printf("   -> 状态码错误: %d\n", resp.StatusCode)
			resp.Body.Close()
			continue
		}
		data, err := io.ReadAll(resp.Body)
		resp.Body.Close()
		if err != nil {
			fmt.Printf("   -> 读取失败: %v\n", err)
			continue
		}

		_ = os.WriteFile(destPath, data, 0644)
		_ = os.WriteFile(hashPath, data, 0644)
		fmt.Printf("   -> 成功缓存: %s (大小: %d 字节)\n", destPath, len(data))
	}
}