package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"

	"affiliate_dash/internal/pkg/lewan"

	"github.com/joho/godotenv"
)

type catalogItem struct {
	SKU            string
	Name           string
	LewanProductID string
	DLCGoodID      string
}

// 与 docs/商品目录.md 保持一致（2026-09-14 自营商户快照）
var catalog = []catalogItem{
	{SKU: "suit_jester_face", Name: "套装-花面小丑", LewanProductID: "b3891176-5ffa-40cb-8c58-7e46eac3f381"},
	{SKU: "suit_dune_song", Name: "套装-沙丘之歌", LewanProductID: "f3b83b85-c664-4440-94ac-a4b0cd7cf0f3"},
	{SKU: "pack_dragon_palace", Name: "龙宫之主大礼包", LewanProductID: "46524a53-068d-4bee-97ff-d5e7873818e0"},
	{SKU: "lucky_coin_x90", Name: "幸运币90个", LewanProductID: "518e3bec-f9f2-483b-89ae-d826c9cf14e5", DLCGoodID: "682ef39ca8f40c4234c59f42"},
	{SKU: "lucky_coin_x30", Name: "幸运币30个", LewanProductID: "b1c64119-d164-41e6-a1dc-0d8167dd09de", DLCGoodID: "682ef39ca8f40c4234c59f44"},
	{SKU: "lucky_coin_x2", Name: "幸运币2个", LewanProductID: "d5dfa4e3-675b-4187-8163-8aa04727c6e4", DLCGoodID: "682ef39ca8f40c4234c59f46"},
	{SKU: "honor_medal_x90", Name: "荣耀勋章90个", LewanProductID: "779857c7-e6db-40e3-9f4f-4eb5eca350e1", DLCGoodID: "682ef39ca8f40c4234c59f41"},
	{SKU: "honor_medal_x30", Name: "荣耀勋章30个", LewanProductID: "a09d18ce-4a55-4313-925b-6de66d96154b", DLCGoodID: "682ef39ca8f40c4234c59f43"},
	{SKU: "honor_medal_x2", Name: "荣耀勋章2个", LewanProductID: "ed57398a-a470-4d85-abc4-761c81274d9f", DLCGoodID: "682ef39ca8f40c4234c59f45"},
	{SKU: "suit_cloud_bear", Name: "套装-绵云熊熊", DLCGoodID: "682ef39ca8f40c4234c59f40"},
	{SKU: "pack_star_roam_weapon", Name: "星际漫游枪械礼包", DLCGoodID: "682ef39ca8f40c4234c59f3f"},
	{SKU: "pack_star_roam_outfit", Name: "星际漫游服装礼包", DLCGoodID: "682ef39ca8f40c4234c59f3e"},
	{SKU: "suit_sand_dancer", Name: "套装-狂沙舞者", DLCGoodID: "682ef39ca8f40c4234c59f3d"},
	{SKU: "pack_lava_ranger", Name: "熔岩游骑兵礼包", DLCGoodID: "682ef39ca8f40c4234c59f3c"},
	{SKU: "suit_panda_tuan", Name: "套装-胖达团团", DLCGoodID: "682ef39ca8f40c4234c59f3b"},
	{SKU: "suit_panda_round", Name: "套装-胖达圆圆", DLCGoodID: "682ef39ca8f40c4234c59f3a"},
	{SKU: "helmet_panda_treasure", Name: "国宝胖达头盔", DLCGoodID: "682ef39ca8f40c4234c59f39"},
	{SKU: "suit_western_mystery", Name: "套装-西部谜踪", DLCGoodID: "682ef39ca8f40c4234c59f35"},
	{SKU: "helmet_hamster_gray", Name: "仓鼠灰灰头盔", DLCGoodID: "682ef3c5a8f40c4234c59f54"},
	{SKU: "bag_hamster_gray", Name: "仓鼠灰灰背包", DLCGoodID: "682ef3c5a8f40c4234c59f55"},
	{SKU: "helmet_pink_sheep", Name: "糯粉咩咩头盔", DLCGoodID: "682ef3c5a8f40c4234c59f4e"},
	{SKU: "bag_pink_sheep", Name: "糯粉咩咩背包", DLCGoodID: "682ef3c5a8f40c4234c59f4f"},
	{SKU: "suit_cute_bear", Name: "套装-萌熊伴侣", DLCGoodID: "682ef3c5a8f40c4234c59f4b"},
	{SKU: "suit_hamster_gray", Name: "套装-仓鼠灰灰", DLCGoodID: "682ef3c5a8f40c4234c59f53"},
	{SKU: "frag_pink_sheep", Name: "破片手榴弹-糯粉咩咩", DLCGoodID: "682ef3c5a8f40c4234c59f51"},
	{SKU: "smoke_pink_sheep", Name: "烟雾弹-糯粉咩咩", DLCGoodID: "682ef3c5a8f40c4234c59f50"},
	{SKU: "pack_western_cowboy", Name: "西部牛仔大礼包", DLCGoodID: "682ef3c5a8f40c4234c59f4c"},
	{SKU: "suit_romantic_destiny", Name: "套装-浪漫天命", LewanProductID: "b1fff090-e389-4c6c-9c51-32751582239d", DLCGoodID: "6a13ab21e3bce430aca29b04"},
	{SKU: "suit_first_peach", Name: "套装-恋恋初桃", DLCGoodID: "682ef3c5a8f40c4234c59f48"},
	{SKU: "suit_pink_sheep", Name: "套装-糯粉咩咩", DLCGoodID: "682ef3c5a8f40c4234c59f4d"},
	{SKU: "suit_dual_fluffy", Name: "套装-双彩绵绵", DLCGoodID: "682ef3c5a8f40c4234c59f49"},
	{SKU: "bag_cute_bear", Name: "萌熊伴侣背包", DLCGoodID: "682ef3c5a8f40c4234c59f4a"},
	{SKU: "m416_hamster_gray", Name: "M416-仓鼠灰灰", DLCGoodID: "682ef3c5a8f40c4234c59f52"},
	{SKU: "top_black_elite_trainer", Name: "黑色高级特训官上衣", LewanProductID: "8621502c-e355-455c-9b74-a7e642a40cfe", DLCGoodID: "6a13aaeae3bce430aca29b03"},
	{SKU: "suit_shadow_gothic", Name: "套装-暗影哥特", LewanProductID: "8eed3610-7238-4b89-8010-6713268f7cd3", DLCGoodID: "6a13aa55e3bce430aca29b01"},
	{SKU: "suit_alan_walker", Name: "套装-Alan Walker", DLCGoodID: "682ef3c5a8f40c4234c59f47"},
}

func main() {
	root := findRepoRoot()
	_ = godotenv.Load(filepath.Join(root, ".env"))
	outDir := filepath.Join(root, "frontend", "public", "images", "products")
	if err := os.MkdirAll(outDir, 0o755); err != nil {
		fatal(err)
	}

	httpClient := &http.Client{Timeout: 30 * time.Second}
	lewanClient := lewan.NewClient(lewan.Config{
		BaseURL:       os.Getenv("LEWAN_BASE_URL"),
		AccessKey:     os.Getenv("LEWAN_ACCESS_KEY"),
		SecretKey:     os.Getenv("LEWAN_SECRET_KEY"),
		ApplicationID: os.Getenv("LEWAN_APPLICATION_ID"),
	}, httpClient)
	bffBase := strings.TrimRight(envOr("DELIVERY_BFF_BASE_URL", "https://www.jxya.top/bff"), "/")

	ctx := context.Background()
	ok, skip, fail := 0, 0, 0
	for _, item := range catalog {
		dest := filepath.Join(outDir, item.SKU+".webp")
		if st, err := os.Stat(dest); err == nil && st.Size() > 0 {
			fmt.Printf("skip  %s (exists)\n", item.SKU)
			skip++
			continue
		}

		var imgURL string
		var src string

		// 1) 已有按乐玩 UUID 缓存的本地文件
		if item.LewanProductID != "" {
			legacy := filepath.Join(outDir, item.LewanProductID+".webp")
			if data, err := os.ReadFile(legacy); err == nil && len(data) > 0 {
				if err := os.WriteFile(dest, data, 0o644); err != nil {
					fmt.Printf("fail  %s copy uuid cache: %v\n", item.SKU, err)
					fail++
					continue
				}
				fmt.Printf("ok    %s <- uuid cache %s\n", item.SKU, item.LewanProductID)
				ok++
				continue
			}
		}

		// 2) 乐玩详情 thumbnailUrl
		if item.LewanProductID != "" {
			if p, err := lewanClient.GetProduct(ctx, item.LewanProductID); err == nil && strings.TrimSpace(p.ThumbnailUrl) != "" {
				imgURL = strings.TrimSpace(p.ThumbnailUrl)
				src = "lewan:" + item.LewanProductID
			}
		}

		// 3) DLC BFF goods detail
		if imgURL == "" && item.DLCGoodID != "" {
			if u, err := fetchDLCImage(httpClient, bffBase, item.DLCGoodID); err == nil && u != "" {
				imgURL = u
				src = "dlc:" + item.DLCGoodID
			} else if err != nil {
				fmt.Printf("warn  %s dlc detail: %v\n", item.SKU, err)
			}
		}

		// 4) 乐玩按中文名搜索
		if imgURL == "" {
			if p, err := findLewanByName(ctx, lewanClient, item.Name); err == nil && p != nil && strings.TrimSpace(p.ThumbnailUrl) != "" {
				imgURL = strings.TrimSpace(p.ThumbnailUrl)
				src = "lewan-name:" + p.ID
			}
		}

		if imgURL == "" {
			fmt.Printf("fail  %s no image source\n", item.SKU)
			fail++
			continue
		}
		if err := downloadFile(httpClient, imgURL, dest); err != nil {
			fmt.Printf("fail  %s download %s: %v\n", item.SKU, imgURL, err)
			fail++
			continue
		}
		fmt.Printf("ok    %s <- %s\n", item.SKU, src)
		ok++
	}

	fmt.Printf("\ndone: ok=%d skip=%d fail=%d out=%s\n", ok, skip, fail, outDir)
	if fail > 0 {
		os.Exit(1)
	}
}

func findLewanByName(ctx context.Context, client *lewan.Client, name string) (*lewan.Product, error) {
	page := 1
	for page <= 20 {
		res, err := client.ListProducts(ctx, page, 50, name)
		if err != nil {
			return nil, err
		}
		for i := range res.Items {
			if strings.TrimSpace(res.Items[i].Name) == strings.TrimSpace(name) {
				return &res.Items[i], nil
			}
		}
		if int64(page*50) >= res.Total || len(res.Items) == 0 {
			break
		}
		page++
	}
	return nil, nil
}

func fetchDLCImage(client *http.Client, bffBase, goodID string) (string, error) {
	var out struct {
		Good map[string]interface{} `json:"good"`
	}
	if err := signProxy(client, bffBase, "/public/goods/detail", "POST", map[string]interface{}{
		"good_id": goodID,
	}, &out); err != nil {
		return "", err
	}
	if out.Good == nil {
		return "", fmt.Errorf("empty good")
	}
	for _, key := range []string{"image", "cover", "thumbnail", "pic", "img"} {
		if v, ok := out.Good[key].(string); ok && strings.TrimSpace(v) != "" {
			return strings.TrimSpace(v), nil
		}
	}
	return "", fmt.Errorf("no image field in good")
}

func signProxy(client *http.Client, bffBase, path, method string, data interface{}, out interface{}) error {
	payload, err := json.Marshal(map[string]interface{}{
		"path":   path,
		"method": strings.ToUpper(method),
		"data":   data,
	})
	if err != nil {
		return err
	}
	req, err := http.NewRequest(http.MethodPost, bffBase+"/sign-proxy", bytes.NewReader(payload))
	if err != nil {
		return err
	}
	req.Header.Set("Content-Type", "application/json")
	resp, err := client.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	body, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
	var envelope struct {
		Code    interface{}     `json:"code"`
		Message string          `json:"message"`
		Data    json.RawMessage `json:"data"`
	}
	if err := json.Unmarshal(body, &envelope); err != nil {
		return fmt.Errorf("parse: %s", string(body))
	}
	codeOK := false
	switch v := envelope.Code.(type) {
	case float64:
		codeOK = v == 0
	case string:
		codeOK = v == "0" || v == ""
	case nil:
		codeOK = resp.StatusCode >= 200 && resp.StatusCode < 300
	}
	if !codeOK {
		if envelope.Message != "" {
			return fmt.Errorf("%s", envelope.Message)
		}
		return fmt.Errorf("http %d: %s", resp.StatusCode, string(body))
	}
	if out == nil || len(envelope.Data) == 0 || string(envelope.Data) == "null" {
		return nil
	}
	return json.Unmarshal(envelope.Data, out)
}

func downloadFile(client *http.Client, url, dest string) error {
	req, err := http.NewRequest(http.MethodGet, url, nil)
	if err != nil {
		return err
	}
	resp, err := client.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return fmt.Errorf("http %d", resp.StatusCode)
	}
	data, err := io.ReadAll(io.LimitReader(resp.Body, 8<<20))
	if err != nil {
		return err
	}
	if len(data) < 32 {
		return fmt.Errorf("too small (%d bytes)", len(data))
	}
	tmp := dest + ".tmp"
	if err := os.WriteFile(tmp, data, 0o644); err != nil {
		return err
	}
	return os.Rename(tmp, dest)
}

func findRepoRoot() string {
	wd, _ := os.Getwd()
	dir := wd
	for i := 0; i < 6; i++ {
		if _, err := os.Stat(filepath.Join(dir, "frontend", "public")); err == nil {
			return dir
		}
		if _, err := os.Stat(filepath.Join(dir, ".env")); err == nil {
			if _, err2 := os.Stat(filepath.Join(dir, "backend")); err2 == nil {
				return dir
			}
		}
		parent := filepath.Dir(dir)
		if parent == dir {
			break
		}
		dir = parent
	}
	// go run from backend/
	if filepath.Base(wd) == "backend" {
		return filepath.Dir(wd)
	}
	return filepath.Dir(wd)
}

func envOr(key, fallback string) string {
	if v := strings.TrimSpace(os.Getenv(key)); v != "" {
		return v
	}
	return fallback
}

func fatal(err error) {
	fmt.Fprintf(os.Stderr, "error: %v\n", err)
	os.Exit(1)
}