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// Copyright 2018 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

// Package cmd provides subcommands to the gitea binary - such as "web" or
// "admin".
package cmd

import (
	"context"
	"errors"
	"fmt"
	"os"
	"os/signal"
	"strings"
	"syscall"

	"code.gitea.io/gitea/models/db"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/util"

	"github.com/urfave/cli"
)

// argsSet checks that all the required arguments are set. args is a list of
// arguments that must be set in the passed Context.
func argsSet(c *cli.Context, args ...string) error {
	for _, a := range args {
		if !c.IsSet(a) {
			return errors.New(a + " is not set")
		}

		if util.IsEmptyString(a) {
			return errors.New(a + " is required")
		}
	}
	return nil
}

// confirm waits for user input which confirms an action
func confirm() (bool, error) {
	var response string

	_, err := fmt.Scanln(&response)
	if err != nil {
		return false, err
	}

	switch strings.ToLower(response) {
	case "y", "yes":
		return true, nil
	case "n", "no":
		return false, nil
	default:
		return false, errors.New(response + " isn't a correct confirmation string")
	}
}

func initDB(ctx context.Context) error {
	setting.LoadFromExisting()
	setting.InitDBConfig()
	setting.NewXORMLogService(false)

	if setting.Database.Type == "" {
		log.Fatal(`Database settings are missing from the configuration file: %q.
Ensure you are running in the correct environment or set the correct configuration file with -c.
If this is the intended configuration file complete the [database] section.`, setting.CustomConf)
	}
	if err := db.InitEngine(ctx); err != nil {
		return fmt.Errorf("unable to initialise the database using the configuration in %q. Error: %v", setting.CustomConf, err)
	}
	return nil
}

func installSignals() (context.Context, context.CancelFunc) {
	ctx, cancel := context.WithCancel(context.Background())
	go func() {
		// install notify
		signalChannel := make(chan os.Signal, 1)

		signal.Notify(
			signalChannel,
			syscall.SIGINT,
			syscall.SIGTERM,
		)
		select {
		case <-signalChannel:
		case <-ctx.Done():
		}
		cancel()
		signal.Reset()
	}()

	return ctx, cancel
}