package main

import (
	"context"
	"database/sql"
	"errors"
	"fmt"
	"net/url"

	_ "github.com/glebarez/go-sqlite"
	_ "github.com/lib/pq"
)

type Driver struct {
	*sql.DB
}

func NewDriver(ctx context.Context, conn string) (Driver, error) {
	engine := "sqlite"
	if conn == "" {
		conn = ":memory:"
	} else {
		if u, err := url.Parse(conn); err != nil {
			return Driver{}, err
		} else if u.Scheme != "" {
			engine = u.Scheme
		}
	}

	db, err := sql.Open(engine, conn)
	if err != nil {
		return Driver{}, err
	}

	driver := Driver{DB: db}
	if err := driver.setup(ctx); err != nil {
		driver.Close()
		return Driver{}, fmt.Errorf("failed setup: %w", err)
	}

	return driver, nil
}

/*
func (driver Driver) FillWithTestdata(ctx context.Context, assetPattern, datacenterPattern, eventNamePattern string) error {
	d := "./testdata/slack_events"
	entries, err := os.ReadDir(d)
	if err != nil {
		return err
	}
	for _, entry := range entries {
		if entry.IsDir() {
			continue
		}
		b, err := os.ReadFile(path.Join(d, entry.Name()))
		if err != nil {
			return err
		}
		m, err := ParseSlack(b, assetPattern, datacenterPattern, eventNamePattern)
		if errors.Is(err, ErrIrrelevantMessage) {
			continue
		} else if err != nil {
			return err
		}
		if err := driver.Set(nil, "m", m.ID, m.Serialize()); err != nil {
			return err
		}
	}
	return nil
}
*/

func (driver Driver) setup(ctx context.Context) error {
	_, err := driver.ExecContext(ctx, `
      DROP TABLE IF EXISTS spoc_bot_vr_q;
      DROP TABLE IF EXISTS spoc_bot_vr_messages;
	`)
	return err
}

func (d Driver) table(s string) (string, error) {
	switch s {
	case "q":
		return "spoc_bot_vr_q", nil
	case "m":
		return "spoc_bot_vr_messages", nil
	}
	return "", errors.New("invalid table " + s)
}