package cmd

import (
	"errors"
	"fmt"

	"github.com/golang-migrate/migrate/v4"
	"github.com/rs/zerolog"

	"orus.io/orus-io/go-orusapi/database"
)

type MigrateCmd[E any] struct {
	program *Program[E]
}

func (cmd *MigrateCmd[E]) Execute([]string) error {
	cmd.program.LoggingOptions.SetMinLoggingLevel(zerolog.InfoLevel)
	log := cmd.program.Logger
	m, err := database.NewMigrate(cmd.program.DatabaseOptions.DSN, cmd.program.dbMigrateSource)
	if err != nil {
		return fmt.Errorf("failed to init migration engine: %w", err)
	}
	defer func() {
		if sourceErr, databaseErr := m.Close(); sourceErr != nil || databaseErr != nil {
			if sourceErr != nil {
				log.Err(err).Msg("error closing Migrate source")
			}
			if databaseErr != nil {
				log.Err(err).Msg("error closing Migrate database")
			}
		}
	}()

	if err := m.Up(); err != nil {
		if errors.Is(err, migrate.ErrNoChange) {
			log.Info().Msg("The database is already up-to-date")
		} else {
			return fmt.Errorf("failed to run migration: %w", err)
		}
	} else {
		log.Info().Msg("database successfully upgraded")
	}

	return nil
}

func SetupMigrateCmd[E any](program *Program[E]) *MigrateCmd[E] {
	cmd := MigrateCmd[E]{
		program: program,
	}

	migrate, err := program.Parser.AddCommand(
		"migrate", "Migrate the DB to the right version", "", &cmd)
	if err != nil {
		program.Logger.Fatal().Msg(err.Error())
	}
	migrate.EnvNamespace = "MIGRATE"

	return &cmd
}