package main

import (
	"bytes"
	"fmt"
	"os"
	"slices"
	"sort"
	"strings"

	"git.akyoto.dev/go/markdown"
	"git.akyoto.dev/go/web"
	"git.akyoto.dev/go/web/send"
)

type App struct {
	html  string
	posts map[string]*Post
}

func New() *App {
	html := loadClean("public/app.html")
	css := loadClean("public/app.css")
	html = strings.Replace(html, "{head}", fmt.Sprintf("{head}<style>%s</style>", css), 1)
	posts := loadPosts("posts")

	return &App{
		html:  html,
		posts: posts,
	}
}

func (app *App) Run() {
	s := web.NewServer()

	s.Use(func(ctx web.Context) error {
		defer func() {
			err := recover()

			if err != nil {
				fmt.Println("Recovered panic:", err)
			}
		}()

		return ctx.Next()
	})

	s.Use(func(ctx web.Context) error {
		path := ctx.Request().Path()

		if len(path) > 1 && strings.HasSuffix(path, "/") {
			return ctx.Redirect(301, strings.TrimSuffix(path, "/"))
		}

		return ctx.Next()
	})

	render := func(ctx web.Context, head string, body string) error {
		html := app.html
		html = strings.Replace(html, "{head}", head, 1)
		html = strings.Replace(html, "{body}", body, 1)
		return send.HTML(ctx, html)
	}

	s.Get("/", func(ctx web.Context) error {
		html := bytes.Buffer{}
		html.WriteString(`<h2>Blog</h2><ul class="blog">`)
		articles := []*Post{}

		for _, post := range app.posts {
			if !post.Published || !slices.Contains(post.Tags, "article") {
				continue
			}

			articles = append(articles, post)
		}

		sort.Slice(articles, func(i, j int) bool {
			return articles[i].Created > articles[j].Created
		})

		for _, post := range articles {
			fmt.Fprintf(&html, `<li><a href="/%s">%s</a><time datetime="%s">%s</time></li>`, post.Slug, post.Title, post.Created, post.Created[:len("YYYY")])
		}

		html.WriteString(`</ul>`)
		return render(ctx, "<title>akyoto.dev</title>", html.String())
	})

	s.Get("/:post", func(ctx web.Context) error {
		slug := ctx.Request().Param("post")
		post := app.posts[slug]
		head := fmt.Sprintf(`<title>%s</title><meta name="keywords" content="%s">`, post.Title, strings.Join(post.Tags, ","))
		content := ""

		if slices.Contains(post.Tags, "article") {
			content = fmt.Sprintf(
				`<article><header><h1>%s</h1><time datetime="%s">%s</time></header>%s</article>`,
				post.Title,
				post.Created,
				post.Created[:len("YYYY-MM-DD")],
				markdown.Render(post.Content),
			)
		} else {
			content = fmt.Sprintf(
				`<h2>%s</h2>%s`,
				post.Title,
				markdown.Render(post.Content),
			)
		}

		return render(ctx, head, content)
	})

	address := os.Getenv("LISTEN")

	if address == "" {
		address = ":8080"
	}

	s.Run(address)
}

func load(path string) string {
	dataBytes, err := os.ReadFile(path)

	if err != nil {
		panic(err)
	}

	return string(dataBytes)
}

func loadClean(path string) string {
	data := load(path)
	data = strings.ReplaceAll(data, "\t", "")
	data = strings.ReplaceAll(data, "\n", "")
	return data
}