package commands

import (
	"context"
	"fmt"
	"strings"
	"time"

	"github.com/sirupsen/logrus"
	"github.com/urfave/cli"

	"github.com/photoprism/photoprism/internal/config"
	"github.com/photoprism/photoprism/internal/migrate"
)

// MigrationsCommand registers the "migrations" CLI command.
var MigrationsCommand = cli.Command{
	Name:  "migrations",
	Usage: "Database schema migration subcommands",
	Subcommands: []cli.Command{
		{
			Name:      "ls",
			Aliases:   []string{"status", "show"},
			Usage:     "Lists the status of schema migrations",
			ArgsUsage: "[migrations...]",
			Action:    migrationsStatusAction,
		},
		{
			Name:      "run",
			Aliases:   []string{"execute", "migrate"},
			Usage:     "Executes database schema migrations",
			ArgsUsage: "[migrations...]",
			Flags: []cli.Flag{
				cli.BoolFlag{
					Name:  "failed, f",
					Usage: "run previously failed migrations",
				},
				cli.BoolFlag{
					Name:  "trace, t",
					Usage: "show trace logs for debugging",
				},
			},
			Action: migrationsRunAction,
		},
	},
}

// migrationsStatusAction lists the status of schema migration.
func migrationsStatusAction(ctx *cli.Context) error {
	conf := config.NewConfig(ctx)

	_, cancel := context.WithCancel(context.Background())
	defer cancel()

	if err := conf.Init(); err != nil {
		return err
	}

	defer conf.Shutdown()

	var ids []string

	// Check argument for specific migrations to be run.
	if migrations := strings.TrimSpace(ctx.Args().First()); migrations != "" {
		ids = strings.Fields(migrations)
	}

	db := conf.Db()

	status, err := migrate.Status(db, ids)

	if err != nil {
		return err
	}

	// Display value names.
	fmt.Printf("%-17s %-9s %-21s %-21s %s\n", "ID", "Dialect", "Started At", "Finished At", "Status")

	// Show migrations.
	for _, m := range status {
		var started, finished, info string

		if m.StartedAt.IsZero() {
			started = "-"
		} else {
			started = m.StartedAt.Format("2006-01-02 15:04:05")
		}

		if m.Finished() {
			finished = m.FinishedAt.Format("2006-01-02 15:04:05")
		} else {
			finished = "-"
		}

		if m.Error != "" {
			info = m.Error
		} else if m.Finished() {
			info = "OK"
		} else if m.StartedAt.IsZero() {
			info = "-"
		} else if m.Repeat(false) {
			info = "Repeat"
		} else {
			info = "Running?"
		}

		fmt.Printf("%-17s %-9s %-21s %-21s %s\n", m.ID, m.Dialect, started, finished, info)
	}

	return nil
}

// migrationsRunAction executes database schema migrations.
func migrationsRunAction(ctx *cli.Context) error {
	start := time.Now()

	conf := config.NewConfig(ctx)

	_, cancel := context.WithCancel(context.Background())
	defer cancel()

	if err := conf.Init(); err != nil {
		return err
	}

	defer conf.Shutdown()

	if ctx.Bool("trace") {
		log.SetLevel(logrus.TraceLevel)
		log.Infoln("migrate: enabled trace mode")
	}

	runFailed := ctx.Bool("failed")

	if runFailed {
		log.Infoln("migrate: running previously failed migrations")
	}

	var ids []string

	// Check argument for specific migrations to be run.
	if migrations := strings.TrimSpace(ctx.Args().First()); migrations != "" {
		ids = strings.Fields(migrations)
	}

	log.Infoln("migrating database schema...")

	// Run migrations.
	conf.MigrateDb(runFailed, ids)

	elapsed := time.Since(start)

	log.Infof("migration completed in %s", elapsed)

	return nil
}