package main

import (
	_ "embed"
	"encoding/base64"
	"fmt"
	"log"
	"os"
	"path/filepath"
	"strings"
	"time"
)

//go:embed web/overlay.html
var overlayHTML string

//go:embed web/themes/aurora.html
var themeAurora string

//go:embed web/themes/starfield.html
var themeStarfield string

//go:embed web/themes/gradient.html
var themeGradient string

//go:embed web/themes/particles.html
var themeParticles string

//go:embed web/themes/fractal.html
var themeFractal string

//go:embed web/themes/text.html
var themeText string

var themeMap = map[ThemeName]string{
	ThemeAurora:   themeAurora,
	ThemeStar:     themeStarfield,
	ThemeGradient: themeGradient,
	ThemeParticle: themeParticles,
	ThemeFractal:  themeFractal,
	ThemeText:     themeText,
}

func buildWallpaperHTML(cfg *Config) string {
	var bg string

	switch cfg.WallpaperType {
	case WPTheme:
		if t, ok := themeMap[cfg.Theme]; ok {
			bg = t
		} else {
			bg = themeAurora
		}
	case WPImage:
		if cfg.ImagePath != "" {
			src := imageToDataURI(cfg.ImagePath)
			if src != "" {
				bg = fmt.Sprintf(`<img src="%s" style="position:fixed;top:0;left:0;width:100%%;height:100%%;object-fit:cover;z-index:1;">`, src)
			}
		}
	case WPBing:
		if p := getCurrentBingPath(); p != "" {
			if _, err := os.Stat(p); err == nil {
				src := imageToDataURI(p)
				if src != "" {
					bg = fmt.Sprintf(`<img src="%s" style="position:fixed;top:0;left:0;width:100%%;height:100%%;object-fit:cover;z-index:1;">`, src)
				}
			}
		}
	case WPColor:
		if cfg.ColorGradient && cfg.Color2 != "" {
			bg = fmt.Sprintf(`<div style="position:fixed;top:0;left:0;width:100%%;height:100%%;z-index:1;background:linear-gradient(135deg,%s,%s);"></div>`, cfg.Color1, cfg.Color2)
		} else {
			bg = fmt.Sprintf(`<div style="position:fixed;top:0;left:0;width:100%%;height:100%%;z-index:1;background:%s;"></div>`, cfg.Color1)
		}
	}

	if bg == "" {
		bg = themeAurora
	}
	html := strings.Replace(overlayHTML, "{{BACKGROUND}}", bg, 1)
	html = strings.Replace(html, "{{LAYOUT}}", string(cfg.Layout), 1)

	// 注入自定义文字
	if cfg.WallpaperType == WPTheme && cfg.Theme == ThemeText && cfg.WallpaperText != "" {
		escaped := strings.ReplaceAll(cfg.WallpaperText, `\`, `\\`)
		escaped = strings.ReplaceAll(escaped, `"`, `\"`)
		html = strings.Replace(html, "</script>", `window.wallpaperText = "`+escaped+`";</script>`, 1)
	}

	return html
}

func imageToDataURI(path string) string {
	data, err := os.ReadFile(path)
	if err != nil {
		log.Println("读取图片失败:", err)
		return ""
	}
	ext := strings.ToLower(filepath.Ext(path))
	mime := "image/jpeg"
	switch ext {
	case ".png":
		mime = "image/png"
	case ".gif":
		mime = "image/gif"
	case ".webp":
		mime = "image/webp"
	case ".bmp":
		mime = "image/bmp"
	}
	return fmt.Sprintf("data:%s;base64,%s", mime, base64.StdEncoding.EncodeToString(data))
}

func reloadWallpaper() {
	if wv == nil || wvHwnd == 0 {
		return
	}
	cfg := loadConfig()
	html := buildWallpaperHTML(cfg)
	select {
	case htmlQueue <- html:
	default:
	}
	procPostMessageW.Call(wvHwnd, wmSetHtml, 0, 0)
	go func() {
		time.Sleep(1 * time.Second)
		evalJS(fmt.Sprintf(`window.userZodiac = %q;`, cfg.Zodiac))
		if cfg.Theme == ThemeText && cfg.WallpaperText != "" {
			evalJS(fmt.Sprintf(`window.wallpaperText = %q; var el=document.getElementById("wallpaper-text"); if(el){el.textContent=%q;}`, cfg.WallpaperText, cfg.WallpaperText))
		}
		city := getCurrentCity()
		go fetchAndPushWeather(city)
	}()
}