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// Copyright 2026 Shota FUJI
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
//
// SPDX-License-Identifier: MPL-2.0

package main

import (
	"flag"
	"fmt"
	"os"
	"strings"

	"github.com/evanw/esbuild/pkg/api"
)

func main() {
	outfile := flag.String("outfile", "", "Path to the output file")
	depfile := flag.String("depfile", "", "Path to the depfile")
	entrypoint := flag.String("entrypoint", "", "Path to the input file")

	flag.Parse()

	if *outfile == "" {
		fmt.Fprintln(os.Stderr, "outfile must be set")
		os.Exit(1)
	}

	if *entrypoint == "" {
		fmt.Fprintln(os.Stderr, "entrypoint must be set")
		os.Exit(1)
	}

	infiles := make([]string, 0, 64)

	recordInfilePlugin := api.Plugin{
		Name: "record_infile",
		Setup: func(build api.PluginBuild) {
			build.OnLoad(api.OnLoadOptions{Filter: ".*"}, func(args api.OnLoadArgs) (api.OnLoadResult, error) {
				infiles = append(infiles, args.Path)
				return api.OnLoadResult{}, nil
			})
		},
	}

	saneCssPlugin := api.Plugin{
		Name: "css_string",
		Setup: func(build api.PluginBuild) {
			build.OnLoad(api.OnLoadOptions{Filter: "\\.css$"}, func(args api.OnLoadArgs) (api.OnLoadResult, error) {
				text, err := os.ReadFile(args.Path)
				if err != nil {
					return api.OnLoadResult{}, err
				}

				result := api.Transform(string(text), api.TransformOptions{
					Loader:            api.LoaderCSS,
					MinifyWhitespace:  true,
					MinifyIdentifiers: true,
					MinifySyntax:      true,
				})

				if len(result.Errors) > 0 {
					msg := api.FormatMessages(result.Errors, api.FormatMessagesOptions{
						Kind:  api.ErrorMessage,
						Color: false,
					})

					fmt.Printf("%s\n", strings.Join(msg, "\n"))
					return api.OnLoadResult{}, fmt.Errorf("CSS minification failed")
				}

				contents := string(result.Code)

				return api.OnLoadResult{
					Contents: &contents,
					Loader:   api.LoaderText,
				}, nil
			})
		},
	}

	result := api.Build(api.BuildOptions{
		EntryPoints:       []string{*entrypoint},
		Bundle:            true,
		Outfile:           *outfile,
		Write:             true,
		MinifyWhitespace:  true,
		MinifyIdentifiers: true,
		MinifySyntax:      true,
		Plugins:           []api.Plugin{recordInfilePlugin, saneCssPlugin},
	})

	if len(result.Errors) > 0 {
		for _, err := range result.Errors {
			fmt.Fprintln(os.Stderr, err.Text)
		}
		os.Exit(1)
	}

	if len(result.OutputFiles) == 0 {
		fmt.Fprintln(os.Stderr, "No output files were generated")
		os.Exit(1)
	}

	if len(result.OutputFiles) > 1 {
		fmt.Fprintln(os.Stderr, "More than one file were generated")
		os.Exit(1)
	}

	if *depfile != "" {
		outfile := result.OutputFiles[0]

		depfile, err := os.OpenFile(*depfile, os.O_WRONLY|os.O_CREATE, 0644)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Failed to generate depfile: %v\n", err)
			os.Exit(2)
		}
		defer depfile.Close()

		fmt.Fprintf(depfile, "%s:", outfile.Path)

		for _, infile := range infiles {
			fmt.Fprintf(depfile, " \\\n\t%s", infile)
		}

		fmt.Fprint(depfile, "\n")
	}

	os.Exit(0)
}