package models

import (
	"blog/config"
	"fmt"
	"html/template"
	"io"
)

type TemplatePointer struct {
	*template.Template
}

type HtmlTemplate struct {
	Reader     TemplatePointer
	Talk       TemplatePointer
	Album      TemplatePointer
	Article    TemplatePointer
	Categories TemplatePointer
	Dashboard  TemplatePointer
	ExtraNav   TemplatePointer
	Index      TemplatePointer
}

func (t TemplatePointer) WriteData(w io.Writer, data interface{}) {

	err := t.Execute(w, data)
	if err != nil {
		if _, e := w.Write([]byte(err.Error())); e != nil {
			fmt.Println(e)
		}
	}
}

func (t TemplatePointer) WriteError(w io.Writer, err error) {
	if _, e := w.Write([]byte(err.Error())); e != nil {
		fmt.Println(e)
	}
}

// BuildViewData 构建视图数据
//
// Parameters:
//
//	title: 页面标题
//	data: 页面数据
//
// Returns:
//
//	map[string]interface{}: 包含标题、数据、网站配置和导航栏信息的映射
func BuildViewData(title string, data interface{}) map[string]interface{} {
	return map[string]interface{}{
		"Title":  title,      // 页面标题
		"Data":   data,       // 页面数据
		"Config": config.Cfg, // 网站配置
		"Navs":   Navigation, // 导航栏数据
	}
}

// initHtmlTemplate 初始化 HTML 模板
//
// Parameters:
//
//	viewDir: 视图文件目录路径
//
// Returns:
//
//	HtmlTemplate: HTML 模板对象
//	error: 错误信息（如果有）
func initHtmlTemplate(viewDir string) (HtmlTemplate, error) {
	tp, err := readHtmlTemplate(
		[]string{"index", "extraNav", "dashboard", "categories", "article", "album", "talk", "reader"},
		viewDir)
	if err != nil {
		return HtmlTemplate{}, err
	}

	return HtmlTemplate{
		Index:      tp[0],
		ExtraNav:   tp[1],
		Dashboard:  tp[2],
		Categories: tp[3],
		Article:    tp[4],
		Album:      tp[5],
		Talk:       tp[6],
		Reader:     tp[7],
	}, nil
}
func SpreadDigit(n int) []int {
	var r []int
	for i := 1; i <= n; i++ {
		r = append(r, i)
	}
	return r
}

// readHtmlTemplate 读取 HTML 模板文件
//
// Parameters:
//
//	htmlFileName: HTML 文件名列表
//	viewDir: 视图文件目录路径
//
// Returns:
//
//	[]TemplatePointer: HTML 模板指针列表
//	error: 错误信息（如果有）
func readHtmlTemplate(htmlFileName []string, viewDir string) ([]TemplatePointer, error) {
	var htmlTemplate []TemplatePointer

	head := viewDir + "/layouts/head.gohtml"
	nav := viewDir + "/layouts/nav.gohtml"
	footer := viewDir + "/layouts/footer.gohtml"
	reviews := viewDir + "/layouts/reviews.gohtml"

	for _, name := range htmlFileName {
		tp, err := template.New(name+".gohtml").
			Funcs(template.FuncMap{"SpreadDigit": SpreadDigit}).
			ParseFiles(viewDir+"/"+name+".gohtml", head, nav, footer, reviews)
		if err != nil {
			return nil, err
		}
		htmlTemplate = append(htmlTemplate, TemplatePointer{tp})
	}

	return htmlTemplate, nil
}