package postgres

import (
	"context"
	"fmt"

	"git.staur.ca/stobbsm/kea-manage/ipv4/reservation"
	"git.staur.ca/stobbsm/kea-manage/lib/database"
	"git.staur.ca/stobbsm/kea-manage/lib/types"
	"github.com/jackc/pgx/v5"
)

type Postgres struct {
	connString string
	conn       *pgx.Conn
}

// Open receives the host, port, username, password and database name of a postgresql
// database, and manages connections to it.
func Open(host, port, user, password, name string) *Postgres {
	var p = &Postgres{
		connString: fmt.Sprintf("postgres://%s:%s@%s:%s/%s", user, password, host, port, name),
	}
	return p
}

func (p *Postgres) connect(ctx context.Context) error {
	var err error
	p.conn, err = pgx.Connect(ctx, p.connString)
	return err
}

func (p *Postgres) close() {
	p.conn.Close(context.Background())
}

// InsertResV4 adds IPv4 reservations to the kea database
func (p *Postgres) InsertResV4(r *reservation.ReservationV4) error {
	if err := p.connect(context.Background()); err != nil {
		return err
	}
	defer p.close()

	tx, err := p.conn.Begin(context.Background())
	if err != nil {
		return err
	}
	defer tx.Rollback(context.Background())

	ct, err := tx.Exec(context.Background(), insertIfNotExists, r.Identifier, types.HwAddress.Int(), r.SubnetID, r.Ipv4, r.Hostname)
	if err != nil {
		return err
	}

	if err = tx.Commit(context.Background()); err != nil {
		return err
	}

	if ct.RowsAffected() == 0 {
		return database.Exists
	}

	return nil
}

func (p *Postgres) UpdateResV4(r *reservation.ReservationV4) error {
	if err := p.connect(context.Background()); err != nil {
		return err
	}
	defer p.close()

	tx, err := p.conn.Begin(context.Background())
	if err != nil {
		return err
	}
	defer tx.Rollback(context.Background())

	ct, err := tx.Exec(context.Background(), update, r.Identifier, types.HwAddress.Int(), r.SubnetID, r.Ipv4, r.Hostname)
	if err != nil {
		return err
	}

	if err = tx.Commit(context.Background()); err != nil {
		return err
	}

	if ct.RowsAffected() == 0 {
		return database.Exists
	}

	return nil
}