package frontend

import (
	"errors"
	"log"

	"github.com/evanw/esbuild/pkg/api"
	"github.com/urfave/cli/v2"
)

var FrontendCommand *cli.Command = &cli.Command{
	Name:        "frontend",
	Description: "Build/watch frontend",
	Action: func(c *cli.Context) error {
		dev := c.Bool("dev")
		watch := c.Bool("watch")
		buildOpts := api.BuildOptions{
			EntryPoints: []string{
				"./web/src/index.js",
				"./web/src/index.css",
				"./web/src/index.html",
			},
			Outdir:            "./web/dist",
			Bundle:            true,
			Write:             true,
			MinifyWhitespace:  !dev,
			MinifyIdentifiers: !dev,
			MinifySyntax:      !dev,
			JSX:               api.JSXAutomatic,
			Loader: map[string]api.Loader{
				".js":   api.LoaderJSX,
				".css":  api.LoaderCSS,
				".html": api.LoaderCopy,
			},
		}
		if watch {
			ctx, err := api.Context(buildOpts)
			if err != nil {
				return err
			}
			if err := ctx.Watch(api.WatchOptions{}); err != nil {
				return err
			}
			log.Println("watching frontend")
			<-c.Done()
		} else {
			if br := api.Build(buildOpts); br.Errors != nil {
				for _, e := range br.Errors {
					log.Println(e.Location, e.Detail, e.Text)
				}

				return errors.New("build failed")
			}
		}

		return nil
	},
	Flags: []cli.Flag{
		&cli.BoolFlag{
			Name:  "dev",
			Value: false,
		},
		&cli.BoolFlag{
			Name:  "watch",
			Value: false,
		},
	},
}