package migrate

import (
	"errors"
	"fmt"
	"log/slog"

	"github.com/spf13/cobra"

	"git.avsdev.uk/Go/job-search/internal/cli"
	"git.avsdev.uk/Go/job-search/internal/store"
)

func commandDown(opts *cli.Options) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "down",
		Short: "Migrate SQLite database to a previous version",
		Long: `Roll back the most recent migrations.

--steps 0 rolls back every migration which deletes all data and must be
confirmed by providing -yes.`,
		Args: cobra.NoArgs,
		PersistentPreRun: func(cmd *cobra.Command, args []string) {
			slog.Debug("command persistent pre-run", "command", "migrate.down")
		},
		PersistentPostRun: func(cmd *cobra.Command, args []string) {
			slog.Debug("command persistent post-run", "command", "migrate.down")
		},
		RunE: func(cmd *cobra.Command, args []string) (err error) {
			slog.Debug("command run", "command", "migrate.down")

			yes, _ := cmd.Flags().GetBool("yes")
			steps, _ := cmd.Flags().GetUint("steps")

			migrator, db, err := openMigrator(cmd, opts, false, false)
			if err != nil {
				return err
			}
			defer closeDB(db, &err)

			results, err := store.StepDown(cmd.Context(), migrator, int(steps), yes)
			if len(results) == 0 && err == nil {
				fmt.Println("No changes made to database (empty)")
				return nil
			}
			if errors.Is(err, store.ErrWouldEmptyDatabase) {
				return fmt.Errorf(
					"%w\n\nTo confirm you wish to proceed, pass the --yes flag", err,
				)
			}

			if printErr := printResults(cmd.OutOrStdout(), results); printErr != nil {
				return errors.Join(err, printErr)
			}

			if err != nil {
				return failure(cmd.OutOrStdout(), err)
			}

			return printVersion(cmd.Context(), cmd.OutOrStdout(), migrator)
		},
	}
	cmd.Flags().Uint(
		"steps", 0, "number of migrations to roll back. 0 = all (deletes all data)",
	)
	if err := cmd.MarkFlagRequired("steps"); err != nil {
		panic(err) // only fails if the flag isn't defined
	}
	cmd.Flags().BoolP(
		"yes", "y", false, "confirm you are intending to roll back every migration",
	)

	return cmd
}