package db

import (
	"fmt"
	"strconv"
	"strings"

	"gitea.dwysokinski.me/twhelp/sessions/cmd/sessions/internal"
	"gitea.dwysokinski.me/twhelp/sessions/internal/bundb/migrations"
	"github.com/urfave/cli/v2"
	"go.uber.org/zap"
)

func New() *cli.Command {
	return &cli.Command{
		Name:  "db",
		Usage: "Manages database migrations",
		Subcommands: []*cli.Command{
			newMigrateCmd(),
			newRollbackCmd(),
			newCreateCmd(),
			newStatusCmd(),
		},
	}
}

func newMigrateCmd() *cli.Command {
	return &cli.Command{
		Name:  "migrate",
		Usage: "Migrates database",
		Action: func(c *cli.Context) error {
			logger := zap.L()

			db, err := internal.NewBunDB()
			if err != nil {
				return fmt.Errorf("internal.NewBunDB: %w", err)
			}
			defer func() {
				_ = db.Close()
			}()

			migrator := migrations.NewMigrator(db)

			if err = migrator.Init(c.Context); err != nil {
				return fmt.Errorf("migrator.Init: %w", err)
			}

			group, err := migrator.Migrate(c.Context)
			if err != nil {
				return fmt.Errorf("migrator.Migrate: %w", err)
			}
			if group.ID == 0 {
				logger.Info("there are no new migrations to run")
				return nil
			}

			logger.Info("migrated to "+strconv.FormatInt(group.ID, 10), zap.Int64("id", group.ID))

			return nil
		},
	}
}

func newRollbackCmd() *cli.Command {
	return &cli.Command{
		Name:  "rollback",
		Usage: "Rollbacks the last migration group",
		Action: func(c *cli.Context) error {
			logger := zap.L()

			db, err := internal.NewBunDB()
			if err != nil {
				return fmt.Errorf("internal.NewBunDB: %w", err)
			}
			defer func() {
				_ = db.Close()
			}()

			migrator := migrations.NewMigrator(db)

			group, err := migrator.Rollback(c.Context)
			if err != nil {
				return fmt.Errorf("migrator.Rollback: %w", err)
			}
			if group.ID == 0 {
				logger.Info("there are no groups to roll back")
				return nil
			}

			logger.Info("rolled back "+strconv.FormatInt(group.ID, 10), zap.Int64("id", group.ID))

			return nil
		},
	}
}

func newCreateCmd() *cli.Command {
	return &cli.Command{
		Name:  "create",
		Usage: "Creates migration",
		Subcommands: []*cli.Command{
			{
				Name:  "go",
				Usage: "Creates Go migration",
				Action: func(c *cli.Context) error {
					logger := zap.L()

					migrator := migrations.NewMigrator(nil)

					mf, err := migrator.CreateGoMigration(c.Context, strings.Join(c.Args().Slice(), "_"))
					if err != nil {
						return fmt.Errorf("migrator.CreateGoMigration: %w", err)
					}

					logger.Info("created migration", zap.String("name", mf.Name), zap.String("path", mf.Path))

					return nil
				},
			},
			{
				Name:  "sql",
				Usage: "Creates SQL migration",
				Action: func(c *cli.Context) error {
					logger := zap.L()

					migrator := migrations.NewMigrator(nil)

					files, err := migrator.CreateSQLMigrations(c.Context, strings.Join(c.Args().Slice(), "_"))
					if err != nil {
						return fmt.Errorf("migrator.CreateSQLMigrations: %w", err)
					}

					for _, mf := range files {
						logger.Info("created migration", zap.String("name", mf.Name), zap.String("path", mf.Path))
					}

					return nil
				},
			},
		},
	}
}

func newStatusCmd() *cli.Command {
	return &cli.Command{
		Name:  "status",
		Usage: "Prints migrations status",
		Action: func(c *cli.Context) error {
			logger := zap.L()

			db, err := internal.NewBunDB()
			if err != nil {
				return fmt.Errorf("internal.NewBunDB: %w", err)
			}
			defer func() {
				_ = db.Close()
			}()

			migrator := migrations.NewMigrator(db)

			ms, err := migrator.MigrationsWithStatus(c.Context)
			if err != nil {
				return fmt.Errorf("migrator.MigrationsWithStatus: %w", err)
			}

			logger.Info("migrations: " + ms.String())
			logger.Info("last migration group: " + ms.LastGroup().String())
			logger.Info("unapplied: " + ms.Unapplied().String())

			return nil
		},
	}
}