package main

import (
	"bufio"
	"errors"
	"html/template"
	"net/http"
	"os"
	"path/filepath"
	"slices"
	"strings"
	"time"

	"github.com/adrg/frontmatter"
)

type Post struct {
	markdownData []byte
	Title        string    `toml:"title"`
	PostDate     time.Time `toml:"post_date"`
	Summary      string    `toml:"summary"`
	Body         template.HTML
	FileName     string
}

func postHandler(w http.ResponseWriter, r *http.Request) {

	if _, err := os.Stat(filepath.Join(contentDir, "posts", r.PathValue("post")+".md")); err == nil {

	} else if errors.Is(err, os.ErrNotExist) {
		sendError(w, http.StatusNotFound, "That post could not be found.")
		return
	} else {
		sendError(w, http.StatusInternalServerError, "There was a problem statting the file for that post: "+err.Error())
		return
	}
	tmpl := template.Must(template.ParseFiles(filepath.Join(contentDir, "templates/layout.gohtml"), filepath.Join(contentDir, "templates/post.gohtml")))
	f, err := os.Open(filepath.Join("posts", r.PathValue("post")+".md"))
	if err != nil {
		sendError(w, http.StatusInternalServerError, "There was a problem opening the file for that post: "+err.Error())
		return
	}
	var post Post
	rest, err := frontmatter.Parse(bufio.NewReader(f), &post)
	if err != nil {
		sendError(w, http.StatusInternalServerError, "There was a problem reading the frontmatter for that post: "+err.Error())
		return
	}
	post.FileName = r.PathValue("post")
	post.Body = template.HTML(mdToHTML(rest))
	var data PageData = PageData{
		Header: config.HeaderData,
		Post:   post,
	}
	tmpl.ExecuteTemplate(w, "layout", data)
}
func blogHandler(w http.ResponseWriter, r *http.Request) {
	var data PageData = PageData{
		Header: config.HeaderData,
		Posts:  make([]Post, 0),
	}
	files, _ := os.ReadDir(filepath.Join(contentDir, "posts"))
	for _, file := range files {
		if strings.HasSuffix(file.Name(), ".md") {
			f, err := os.Open(filepath.Join(contentDir, "posts", file.Name()))
			if err != nil {
				continue
			}
			var post Post
			rest, err := frontmatter.Parse(bufio.NewReader(f), &post)
			if err != nil {
				continue
			}
			post.Body = template.HTML(mdToHTML(rest))
			post.FileName = strings.TrimSuffix(file.Name(), ".md")
			data.Posts = append(data.Posts, post)
		}
	}
	slices.Reverse(data.Posts)

	tmpl := template.Must(template.ParseFiles(filepath.Join(contentDir, "templates/layout.gohtml"), filepath.Join(contentDir, "templates/blog.gohtml")))
	tmpl.ExecuteTemplate(w, "layout", data)
}