//go:build mage

package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"

	"github.com/magefile/mage/sh"
)

func downloadGoToSocial(version string) error {
	downloadFolder := filepath.Join(rootBuildDir, "gotosocial")

	if err := os.MkdirAll(downloadFolder, 0o750); err != nil {
		return fmt.Errorf("unable to make %s; %w", downloadFolder, err)
	}

	binaryTarUrl := fmt.Sprintf(
		"https://github.com/superseriousbusiness/gotosocial/releases/download/v%s/gotosocial_%s_linux_amd64.tar.gz",
		version,
		version,
	)
	binaryTarFilepath := filepath.Join(downloadFolder, fmt.Sprintf("gotosocial_%s_linux_amd64.tar.gz", version))

	webAssetsTarUrl := fmt.Sprintf(
		"https://github.com/superseriousbusiness/gotosocial/releases/download/v%s/gotosocial_%s_web-assets.tar.gz",
		version,
		version,
	)
	webAssetsFilepath := filepath.Join(downloadFolder, fmt.Sprintf("gotosocial_%s_web-assets.tar.gz", version))

	checksumUrl := fmt.Sprintf(
		"https://github.com/superseriousbusiness/gotosocial/releases/download/v%s/checksums.txt",
		version,
	)
	checksumFilePath := filepath.Join(downloadFolder, fmt.Sprintf("gotosocial_%s_checksums.txt", version))

	_, err := os.Stat(binaryTarFilepath)
	if err == nil {
		fmt.Printf("GoToSocial %s is already downloaded.\n", version)
		return nil
	}

	downloads := []struct {
		url  string
		path string
	}{
		{
			url:  binaryTarUrl,
			path: binaryTarFilepath,
		},
		{
			url:  webAssetsTarUrl,
			path: webAssetsFilepath,
		},
		{
			url:  checksumUrl,
			path: checksumFilePath,
		},
	}

	for _, v := range downloads {
		if err := func() error {
			download, err := os.Create(v.path)
			if err != nil {
				return fmt.Errorf("unable to create %s; %w", v.path, err)
			}
			defer download.Close()

			client := http.Client{
				CheckRedirect: func(r *http.Request, _ []*http.Request) error {
					r.URL.Opaque = r.URL.Path
					return nil
				},
			}

			resp, err := client.Get(v.url)
			if err != nil {
				return err
			}
			defer resp.Body.Close()

			size, err := io.Copy(download, resp.Body)
			if err != nil {
				return err
			}

			fmt.Printf("Downloaded %s with size %d.\n", v.path, size)

			return nil
		}(); err != nil {
			return err
		}
	}

	if err := os.Chdir(downloadFolder); err != nil {
		return err
	}

	if err := sh.Run("sha256sum", "--check", "--ignore-missing", fmt.Sprintf("gotosocial_%s_checksums.txt", version)); err != nil {
		return err
	}

	if err := os.Chdir("../.."); err != nil {
		return err
	}

	return nil
}