package client

import (
	"context"
	"git.reya.zone/reya/hexmap/build"
	"git.reya.zone/reya/hexmap/proto"
	"github.com/magefile/mage/mg"
	"github.com/magefile/mage/target"
	"os"
	"os/exec"
	"path/filepath"
)

func NPMInstall(ctx context.Context) error {
	var packageLockOutOfDate, nodeModulesOutOfDate bool
	var err error
	if packageLockOutOfDate, err = target.Path("client/package-lock.json", "client/package-lock.json"); err != nil {
		return err
	}
	if nodeModulesOutOfDate, err = target.Dir("client/node_modules", "client/package.json"); err != nil {
		return err
	}
	if !(packageLockOutOfDate || nodeModulesOutOfDate) {
		return nil
	}
	cmd := exec.CommandContext(ctx, "npm", "install")
	cmd.Dir, err = filepath.Abs("client")
	if err != nil {
		return err
	}
	cmd.Stderr = os.Stderr
	if mg.Verbose() {
		cmd.Stdout = os.Stdout
	}
	return nil
}

func ProtocFlags() ([]string, error) {
	buildPath, err := filepath.Abs(filepath.Join(build.ToolsDir, "protoc-gen-ts_proto"))
	if err != nil {
		return nil, err
	}
	return []string{
		"--plugin=" + buildPath,
		"--ts_proto_out=client/src/proto/",
		"--ts_proto_opt=env=browser",
		"--ts_proto_opt=esModuleInterop=true",
	}, nil
}

type Protobuf mg.Namespace

const TSPluginNPMLocation = "client/node_modules/.bin/protoc-gen-ts_proto"

func (Protobuf) InstallTSPlugin(ctx context.Context) error {
	mg.CtxDeps(ctx, NPMInstall)
	buildPath, err := filepath.Abs(filepath.Join(build.ToolsDir, "protoc-gen-ts_proto"))
	if err != nil {
		return err
	}
	sourcePath, err := filepath.Abs(TSPluginNPMLocation)
	if err != nil {
		return err
	}
	// Errors here just mean we move on to the next step - this could not exist or not be a link, we don't care.
	// The important part is the later parts.
	if linkPath, err := os.Readlink(buildPath); err == nil && linkPath == sourcePath {
		return nil
	}
	// Remove whatever's in the way, if necessary.
	err = os.Remove(buildPath)
	if err != nil && !os.IsNotExist(err) {
		return err
	}
	err = os.Symlink(sourcePath, buildPath)
	if err != nil && !os.IsExist(err) {
		return err
	}
	return nil
}

func (Protobuf) MakeProtoDir() error {
	if err := os.Mkdir("client/src/proto", 0755); err != nil && !os.IsExist(err) {
		return err
	}
	return nil
}

func (Protobuf) InstallPlugins(ctx context.Context) error {
	mg.CtxDeps(ctx, Protobuf.InstallTSPlugin, Protobuf.MakeProtoDir)
	return 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() error {
	err := os.RemoveAll("client/src/proto")
	if err != nil && !os.IsNotExist(err) {
		return err
	}
	return nil
}

// TODO: Build
// TODO: Clean
// TODO: Serve