package conf

import (
	"errors"
	"io"
	"log"
	"net/http"
	"os"
	"path"
	"path/filepath"

	"github.com/pelletier/go-toml/v2"
)

type Asset struct {
	Path string
	Url  string
}

func (asset *Asset) FetchIfNotExists(staticPath string) {
	destPath := filepath.Join(staticPath, asset.Path)

	err := os.MkdirAll(path.Dir(destPath), os.FileMode(0750))
	if err != nil {
		log.Printf("Couldn't create parent dirs of %s\n", destPath)
		panic(err)
	}

	out, err := os.OpenFile(
		destPath,
		os.O_WRONLY|os.O_CREATE|os.O_EXCL,
		0666,
	)
	if err != nil {
		if errors.Is(err, os.ErrExist) {
			log.Printf("%s already exists\n", destPath)
			return
		}
		panic(err)
	}
	defer out.Close()

	resp, err := http.Get(asset.Url)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	_, err = io.Copy(out, resp.Body)
	if err != nil {
		panic(err)
	}
}

type Config struct {
	Port      int
	Extension string
	NotesDir  string
	Templates struct {
		Dir  string
		Base string
	}
	Static struct {
		Dir    string
		Root   string
		Assets []Asset
	}
}

var Conf Config

func LoadConfig(path string) {
	var err error

	b, err := os.ReadFile(path)
	if err != nil {
		log.Fatal(err)
	}

	err = toml.Unmarshal([]byte(b), &Conf)
	if err != nil {
		log.Fatal(err)
	}

	for _, asset := range Conf.Static.Assets {
		asset.FetchIfNotExists(Conf.Static.Dir)
	}
}