// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package setup

import (
	"flag"
	"fmt"
	"os"

	"github.com/matrix-org/dendrite/internal"
	"github.com/matrix-org/dendrite/setup/config"
	"github.com/sirupsen/logrus"
)

var (
	configPath = flag.String("config", "dendrite.yaml", "The path to the config file. For more information, see the config file in this repository.")
	version    = flag.Bool("version", false, "Shows the current version and exits immediately.")
)

// ParseFlags parses the commandline flags and uses them to create a config.
func ParseFlags(monolith bool) *config.Dendrite {
	flag.Parse()

	if *version {
		fmt.Println(internal.VersionString())
		os.Exit(0)
	}

	if *configPath == "" {
		logrus.Fatal("--config must be supplied")
	}

	cfg, err := config.Load(*configPath, monolith)

	if err != nil {
		logrus.Fatalf("Invalid config file: %s", err)
	}

	return cfg
}
