package models_pages

import (
	"bytes"
	"fmt"
	"html/template"
	"io"
	"log"
	"main/mvc/models"
	"main/tools"
	"os"
	"path/filepath"
	"strings"
	"time"
)

const (
	// Имя соответствующего шаблона
	PostsPageTmplName = "posts.gohtml"
)

type posts map[PostLink]*Post

var (
	allPosts = posts{}
)

func init() {
	if err := loadPosts(models.Cfg.PostsDir); err != nil {
		log.Fatalf("%v", err)
	}
}

func GetPosts() posts {
	return allPosts
}

func loadPosts(dir string) error {
	err := filepath.Walk(dir, func(path string, f os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		if !f.IsDir() && strings.HasSuffix(f.Name(), ".md") {

			file, err := os.Open(path)
			if err != nil {
				return err
			}

			md, err := io.ReadAll(file)
			if err != nil {
				return err
			}

			html := tools.MdToHTML(md)
			link := fmt.Sprintf("/%s/", strings.TrimSuffix(filepath.Base(path), ".md"))
			allPosts[PostLink(link)] = newPost(link, html)
		}
		return nil
	})

	if err != nil {
		return err
	}

	return nil
}

func RenderPostsPage(templates *template.Template, version int64) ([]byte, error) {
	var pageData bytes.Buffer

	context := map[string]any{
		"version":            version,
		"renderingTimestamp": time.Now().Unix(),
		"posts":              allPosts,
	}

	if err := templates.ExecuteTemplate(&pageData, PostsPageTmplName, context); err != nil {
		return nil, err
	}

	return pageData.Bytes(), nil
}