package database

import (
	"forge.cadoles.com/Cadoles/emissary/internal/command/common"
	"forge.cadoles.com/Cadoles/emissary/internal/migrate"
	"github.com/pkg/errors"
	"github.com/urfave/cli/v2"
	"gitlab.com/wpetit/goweb/logger"
)

const (
	MigrateVersionUp     = "up"
	MigrateVersionLatest = "latest"
	MigrateVersionDown   = "down"
)

func MigrateCommand() *cli.Command {
	return &cli.Command{
		Name:  "migrate",
		Usage: "Migrate database schema to latest version",
		Flags: []cli.Flag{
			&cli.StringFlag{
				Name:  "target",
				Usage: "Migration target, default to latest",
				Value: "latest",
			},
			&cli.IntFlag{
				Name:  "force",
				Usage: "Force migration to version",
				Value: -1,
			},
		},
		Action: func(ctx *cli.Context) error {
			conf, err := common.LoadConfig(ctx)
			if err != nil {
				return errors.Wrap(err, "Could not load configuration")
			}

			driver := string(conf.Server.Database.Driver)
			dsn := string(conf.Server.Database.DSN)

			migr, err := migrate.New("migrations", driver, dsn)
			if err != nil {
				return errors.WithStack(err)
			}

			version, dirty, err := migr.Version()
			if err != nil && !errors.Is(err, migrate.ErrNilVersion) {
				return errors.WithStack(err)
			}

			logger.Info(
				ctx.Context, "current database shema",
				logger.F("version", version),
				logger.F("dirty", dirty),
			)

			target := ctx.String("target")
			force := ctx.Int("force")

			if force != -1 {
				logger.Info(ctx.Context, "forcing database schema version", logger.F("version", force))

				if err := migr.Force(force); err != nil {
					return errors.WithStack(err)
				}

				return nil
			}

			switch target {
			case "":
				fallthrough
			case MigrateVersionLatest:
				err = migr.Up()
			case MigrateVersionDown:
				err = migr.Steps(-1)
			case MigrateVersionUp:
				err = migr.Steps(1)
			default:
				return errors.Errorf(
					"unknown migration target: '%s', available: '%s' (default), '%s' or '%s'",
					target, MigrateVersionLatest, MigrateVersionUp, MigrateVersionDown,
				)
			}

			if err != nil && !errors.Is(err, migrate.ErrNoChange) {
				return errors.Wrap(err, "could not apply migration")
			}

			version, dirty, err = migr.Version()
			if err != nil && !errors.Is(err, migrate.ErrNilVersion) {
				return errors.WithStack(err)
			}

			logger.Info(
				ctx.Context, "database shema after migration",
				logger.F("version", version),
				logger.F("dirty", dirty),
			)

			return nil
		},
	}
}