package main

import (
	"encoding/json"
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"
	"time"
)

const bingAPI = "https://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1&mkt=zh-CN"

type bingResponse struct {
	Images []struct {
		URL       string `json:"url"`
		URLBase   string `json:"urlbase"`
		Copyright string `json:"copyright"`
	} `json:"images"`
}

func fetchBingWallpaper() {
	resp, err := httpClient.Get(bingAPI)
	if err != nil {
		log.Println("Bing API 请求失败:", err)
		return
	}
	defer resp.Body.Close()
	data, err := io.ReadAll(resp.Body)
	if err != nil {
		return
	}
	var br bingResponse
	if json.Unmarshal(data, &br) != nil || len(br.Images) == 0 {
		log.Println("Bing API 解析失败")
		return
	}

	imgURL := br.Images[0].URL
	if !strings.HasPrefix(imgURL, "http") {
		imgURL = "https://www.bing.com" + imgURL
	}

	imgResp, err := httpClient.Get(imgURL)
	if err != nil {
		log.Println("Bing 图片下载失败:", err)
		return
	}
	defer imgResp.Body.Close()
	imgData, err := io.ReadAll(imgResp.Body)
	if err != nil {
		return
	}

	bingPath := filepath.Join(configDir(), "bing_wallpaper.jpg")
	if err := os.WriteFile(bingPath, imgData, 0644); err != nil {
		log.Println("Bing 壁纸缓存失败:", err)
		return
	}
	log.Printf("Bing 壁纸已缓存: %s (%d bytes)", bingPath, len(imgData))

	reloadWallpaper()
}

func bingWallpaperLoop() {
	cfg := loadConfig()
	if cfg.WallpaperType == WPBing {
		bingPath := filepath.Join(configDir(), "bing_wallpaper.jpg")
		if _, err := os.Stat(bingPath); err != nil {
			fetchBingWallpaper()
		}
	}

	ticker := time.NewTicker(4 * time.Hour)
	for range ticker.C {
		cfg := loadConfig()
		if cfg.WallpaperType == WPBing {
			fetchBingWallpaper()
		}
	}
}