// android_skia_checkout contains util methods for interacting with
// the Skia repository within Android.
package android_skia_checkout

import (
	"context"
	"fmt"
	"os"
	"path"

	"go.skia.org/infra/go/exec"
)

var (
	// Files within the Skia checkout.
	SkUserConfigManualRelPath  = path.Join("include", "config", "SkUserConfigManual.h")
	SkUserConfigRelPath        = path.Join("include", "config", "SkUserConfig.h")
	SkUserConfigAndroidRelPath = path.Join("android", "include", "config", "SkUserConfig.h")
	SkUserConfigLinuxRelPath   = path.Join("linux", "include", "config", "SkUserConfig.h")
	SkUserConfigMacRelPath     = path.Join("mac", "include", "config", "SkUserConfig.h")
	SkUserConfigWinRelPath     = path.Join("win", "include", "config", "SkUserConfig.h")
	AndroidBpRelPath           = path.Join("Android.bp")
	LibGifRelPath              = path.Join("third_party", "libgifcodec")

	FilesGeneratedByGnToGp = []string{SkUserConfigAndroidRelPath, SkUserConfigLinuxRelPath, SkUserConfigMacRelPath, SkUserConfigWinRelPath, AndroidBpRelPath}
)

const (
	// The remote pointing to googleplex repo that is automatically present
	// in the Skia repository within Android.
	BUILT_IN_REMOTE = "goog"
)

func RunGnToBp(ctx context.Context, skiaCheckout string) error {
	if _, syncErr := exec.RunCwd(ctx, skiaCheckout, "./bin/sync"); syncErr != nil {
		return fmt.Errorf("bin/sync error: %s", syncErr)
	}
	libgifargs := []string{
		"gn/copy_git_directory.py",
		"third_party/externals/libgifcodec",
		LibGifRelPath,
	}
	if _, gifErr := exec.RunCwd(ctx, skiaCheckout, libgifargs...); gifErr != nil {
		return fmt.Errorf("LibGif copy error: %s", gifErr)
	}
	if _, fetchGNErr := exec.RunCwd(ctx, skiaCheckout, "./bin/fetch-gn"); fetchGNErr != nil {
		return fmt.Errorf("Failed to install GN: %s", fetchGNErr)
	}

	// Generate and add files created by gn/gn_to_bp.py
	gnEnv := []string{fmt.Sprintf("PATH=%s/:%s", path.Join(skiaCheckout, "bin"), os.Getenv("PATH"))}
	if _, gnToBpErr := exec.RunCommand(ctx, &exec.Command{
		Env:  gnEnv,
		Dir:  skiaCheckout,
		Name: "python",
		Args: []string{"-c", "from gn import gn_to_bp"},
	}); gnToBpErr != nil {
		return fmt.Errorf("Failed to run gn_to_bp: %s", gnToBpErr)
	}
	return nil
}