package themes // Declare the package at the top
import (
	"fmt"
	"html/template"
	"net/http"
	"os"
	"path/filepath"
	"strings"
)

// ThemeManager manages themes for the blog system
type ThemeManager struct {
	CurrentTheme string                        // Name of the currently active theme
	Templates    map[string]*template.Template // Cached compiled HTML templates
}

// LoadTheme loads a specified theme by its name
func (tm *ThemeManager) LoadTheme(themeName string) error {
	// 1. 读取theme.yaml验证主题有效性
	// 2. 预编译所有HTML模板，缓存到Templates
	// 3. 注册静态资源路由：/themes/[name]/static/*filepath
	tm.CurrentTheme = themeName

	// Step 1: Validate the theme by reading theme.yaml
	themeConfigPath := fmt.Sprintf("h:/code/go_blog/themes/%s/theme.yaml", themeName)
	if _, err := os.Stat(themeConfigPath); os.IsNotExist(err) {
		return fmt.Errorf("theme %s does not exist or is invalid", themeName)
	}

	// Step 2: Precompile all HTML templates and cache them
	tm.Templates = make(map[string]*template.Template)
	templateDir := fmt.Sprintf("h:/code/go_blog/themes/%s/templates", themeName)
	err := filepath.Walk(templateDir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		if !info.IsDir() && strings.HasSuffix(info.Name(), ".html") {
			tmpl, err := template.ParseFiles(path)
			if err != nil {
				return err
			}
			tm.Templates[info.Name()] = tmpl
		}
		return nil
	})
	if err != nil {
		return fmt.Errorf("failed to load templates: %v", err)
	}

	// Step 3: Register static resource routes
	http.Handle(fmt.Sprintf("/themes/%s/static/", themeName), http.StripPrefix(fmt.Sprintf("/themes/%s/static/", themeName), http.FileServer(http.Dir(fmt.Sprintf("h:/code/go_blog/themes/%s/static", themeName)))))

	return nil
}
func NewManager() *ThemeManager {
	return &ThemeManager{}
}