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//go:generate templ generate
//go:generate go run .
package main

import (
	"context"
	"embed"
	"flag"
	"fmt"
	"io"
	iofs "io/fs"
	"net/http"
	"os"
	"path/filepath"

	"github.com/alecthomas/chroma/v2/styles"
)

//go:embed articles/*
var articleFS embed.FS

func maine() error {
	fs := flag.NewFlagSet("blog", flag.ExitOnError)
	outFlag := fs.String("out", "out", "Output directory")
	fs.StringVar(outFlag, "o", *outFlag, "--out")
	serveFlag := fs.Bool("serve", false, "Serve output dir after generation")
	fs.BoolVar(serveFlag, "s", *serveFlag, "--serve")
	if err := fs.Parse(os.Args[1:]); err != nil {
		return err
	}

	files, err := articleFS.ReadDir("articles")
	if err != nil {
		return err
	}

	articles := make(Articles)
	for _, file := range files {
		if filepath.Ext(file.Name()) != ".md" {
			continue
		}
		content, err := iofs.ReadFile(articleFS, fmt.Sprintf("articles/%s", file.Name()))
		if err != nil {
			return err
		}
		article, err := Parse(string(content))
		if err != nil {
			return err
		}
		articles[article.Category] = append(articles[article.Category], article)
		if err := writeArticle(*outFlag, article); err != nil {
			return err
		}
	}

	if err := writeCSS(*outFlag); err != nil {
		return err
	}

	sakuraDst := filepath.Join(*outFlag, "sakura.css")
	if err := copyFile(sakuraDst, "sakura.css"); err != nil {
		return err
	}

	fi, err := os.Create(filepath.Join(*outFlag, "index.html"))
	if err != nil {
		return err
	}
	defer fi.Close()

	if err := IndexTemplate(articles).Render(context.Background(), fi); err != nil {
		return err
	}

	if *serveFlag {
		http.Handle("/", http.FileServer(http.Dir("out")))
		http.ListenAndServe(":8080", nil)
	}

	return nil
}

func writeArticle(out string, article Article) error {
	dest := filepath.Join(out, article.Slug(), "index.html")
	if err := os.MkdirAll(filepath.Dir(dest), os.ModePerm); err != nil {
		return err
	}

	fi, err := os.Create(dest)
	if err != nil {
		return err
	}
	defer fi.Close()

	return ArticleTemplate(article).Render(context.Background(), fi)
}

func writeCSS(out string) error {
	fi, err := os.Create(filepath.Join(out, "chroma.css"))
	if err != nil {
		return err
	}
	defer fi.Close()

	if err := CSS.WriteCSS(fi, styles.Get("catpuccin-latte")); err != nil {
		return err
	}
	fi.WriteString("@media (prefers-color-scheme: dark) {")
	if err := CSS.WriteCSS(fi, styles.Get("catppuccin-mocha")); err != nil {
		return err
	}
	fi.WriteString("}")
	return nil
}

func copyFile(dst, src string) error {
	srcFi, err := os.Open(src)
	if err != nil {
		return err
	}
	defer srcFi.Close()

	dstFi, err := os.Create(dst)
	if err != nil {
		return err
	}
	defer dstFi.Close()

	if _, err := io.Copy(dstFi, srcFi); err != nil {
		return err
	}

	return nil
}

func main() {
	if err := maine(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}