package server

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

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

type Protobuf mg.Namespace

func (Protobuf) InstallGoPlugin(ctx context.Context) error {
	alreadyDone, err := build.HasExecutableInTools("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 ProtocFlags() ([]string, error) {
	buildPath, err := filepath.Abs(filepath.Join(build.ToolsDir, "protoc-gen-go"))
	if err != nil {
		return nil, err
	}
	return []string{"--plugin=" + buildPath, "--go_out=.", "--go_opt=module=git.reya.zone/reya/hexmap"}, nil
}

func (Protobuf) Build(ctx context.Context) error {
	mg.SerialCtxDeps(ctx, Protobuf.Clean, Protobuf.InstallPlugins)
	return proto.Compile(ctx, []proto.ProtocFlagsFunc{ProtocFlags})
}

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
	})
}