package server

import (
	"context"
	"fmt"
	"git.reya.zone/reya/hexmap/build"
	"github.com/magefile/mage/mg"
	"io/fs"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"strings"
)

// TODO: GoGet
// TODO: Build
// TODO: Clean

type Protobuf mg.Namespace

func (Protobuf) InstallGoPlugin(ctx context.Context) error {
	alreadyDone, err := build.HasExecutableInBuildtools("protoc-gen-go")
	if err != nil {
		return err
	}
	if alreadyDone {
		return nil
	}
	return build.InstallGoExecutable(ctx, "google.golang.org/protobuf/cmd/protoc-gen-go@v1.27.1")
}

func (Protobuf) InstallPlugins(ctx context.Context) {
	mg.CtxDeps(ctx, Protobuf.InstallGoPlugin)
}

func (Protobuf) Build(ctx context.Context) error {
	mg.CtxDeps(ctx, Protobuf.Clean, Protobuf.InstallPlugins)
	tooldir, err := build.GetBuildToolsDir()
	if err != nil {
		return err
	}
	goPluginPathFlag := fmt.Sprintf("--plugin=%s", path.Join(tooldir, "protoc-gen-go"))
	cmd := exec.CommandContext(ctx, "protoc", goPluginPathFlag, "-I=proto", "--go_out=.", "--go_opt=module=git.reya.zone/reya/hexmap", "proto/action.proto", "proto/client.proto", "proto/coords.proto", "proto/map.proto", "proto/server.proto", "proto/user.proto")
	cmd.Stderr = os.Stderr
	if mg.Verbose() {
		cmd.Stdout = os.Stdout
	}
	return cmd.Run()
}

func (Protobuf) Clean(ctx context.Context) error {
	return filepath.WalkDir("server", func(path string, d fs.DirEntry, dirErr error) error {
		if ctx.Err() != nil {
			return ctx.Err()
		}
		if dirErr != nil {
			return dirErr
		}
		if strings.HasSuffix(path, ".pb.go") && !d.IsDir() {
			if mg.Verbose() {
				fmt.Printf("Removing generated protobuf code at %s\n", path)
			}
			err := os.Remove(path)
			if err != nil {
				return err
			}
		}
		return nil
	})
}