//go:build dev

/*
Package cmd
Copyright © 2024 Shane C. <shane@scaffoe.com>
*/
package cmd

import (
	"errors"
	"github.com/evanw/esbuild/pkg/api"
	"github.com/kr/pretty"
	"io"
	"io/fs"
	"log"
	"os"
	"path/filepath"
	"strings"

	"github.com/spf13/cobra"
)

var ignoredAssetExtensions = []string{
	".css",
	".js",
	".ts",
}

// assetsCmd represents the assets command
var assetsCmd = &cobra.Command{
	Use:   "assets",
	Short: "Generates assets needed for webserver",
	Run: func(cmd *cobra.Command, args []string) {
		err := filepath.Walk("./web/assets", func(path string, info os.FileInfo, err error) error {

			if info.IsDir() {
				return nil
			}

			relPath, _ := strings.CutPrefix(path, "web/assets/")

			if strings.HasPrefix(relPath, "dist") {
				return nil
			}

			for _, ext := range ignoredAssetExtensions {
				if strings.HasSuffix(info.Name(), ext) {
					return nil
				}
			}

			distFolder, _ := strings.CutSuffix(relPath, info.Name())

			if err := os.MkdirAll("web/assets/dist/"+distFolder, 0600); err != nil && !errors.Is(err, fs.ErrExist) {
				log.Fatalln(err)
			}

			copyFile(path, filepath.Join("web/assets/dist/"+distFolder, info.Name()))

			return nil

		})
		if err != nil {
			log.Fatalln(err)
		}

		result := api.Build(api.BuildOptions{
			Format:            api.FormatESModule,
			EntryPoints:       []string{"./web/assets/js/*.ts", "./web/assets/js/**/*.ts"},
			Outdir:            "./web/assets/dist/js",
			Sourcemap:         api.SourceMapLinked,
			MinifyWhitespace:  true,
			MinifyIdentifiers: true,
			MinifySyntax:      true,
			Splitting:         true,
			Write:             true,
			TreeShaking:       api.TreeShakingTrue,
			Bundle:            true,
		})
		if len(result.Errors) != 0 {
			pretty.Println(result.Errors)
			os.Exit(1)
		}
	},
}

func init() {
	generateCmd.AddCommand(assetsCmd)
}

func copyFile(sourcePath, destinationPath string) {
	sourcePath = filepath.Clean(sourcePath)
	sourceFile, err := os.Open(sourcePath)
	if err != nil {
		log.Fatalln(err)
	}
	defer sourceFile.Close()

	destinationPath = filepath.Clean(destinationPath)
	destinationFile, err := os.Create(destinationPath)
	if err != nil {
		log.Fatalln(err)
	}
	defer destinationFile.Close()

	_, err = io.Copy(destinationFile, sourceFile)
	if err != nil {
		log.Fatalln(err)
	}

	if err := sourceFile.Close(); err != nil {
		log.Fatalln(err)
	}
	if err := destinationFile.Close(); err != nil {
		log.Fatalln(err)
	}

}