package goose

import (
	"database/sql"
	"errors"
	"fmt"
)

var (
	minVersion = int64(0)
	maxVersion = int64((1 << 63) - 1)
)

// Client stores the migration state and preferences. Prefer interacting with
// the Goose API through a Client struct created with New rather than using the
// global Client and functions.
type Client struct {
	// TableName is the name of the table used to store migration status
	// for this client.
	TableName string
	// Dialect is the SqlDialect to use.
	Dialect SqlDialect
	// Migrations is the list of migrations.
	Migrations Migrations
}

func New(tableName string, dialect SqlDialect) *Client {
	return &Client{
		TableName: tableName,
		Dialect:   dialect,
	}
}

func Run(command string, db *sql.DB, dir string, args ...string) error {
	switch command {
	case "up":
		if err := globalGoose.Up(db, dir); err != nil {
			return err
		}
	case "up-by-one":
		if err := globalGoose.UpByOne(db, dir); err != nil {
			return err
		}
	case "create":
		if len(args) == 0 {
			return errors.New("create must be of form: goose [OPTIONS] DRIVER DBSTRING create NAME [go|sql]")
		}

		migrationType := "go"
		if len(args) == 2 {
			migrationType = args[1]
		}
		if err := Create(db, dir, args[0], migrationType); err != nil {
			return err
		}
	case "down":
		if err := globalGoose.Down(db, dir); err != nil {
			return err
		}
	case "redo":
		if err := globalGoose.Redo(db, dir); err != nil {
			return err
		}
	case "status":
		if err := globalGoose.Status(db, dir); err != nil {
			return err
		}
	case "version":
		if err := globalGoose.Version(db, dir); err != nil {
			return err
		}
	default:
		return fmt.Errorf("%q: no such command", command)
	}
	return nil
}