package store

import (
	"context"
	"errors"
	"time"

	"github.com/jackc/pgx/v5/pgconn"
	"github.com/jackc/pgerrcode"
	"github.com/jackc/pgx/v5"
)

// CreateSession adds a new session record.
func (s *Store) CreateSession(ctx context.Context, userID int64, refreshHash, userAgent, ip string, expiresAt time.Time) (*Session, error) {
	var sess Session
	err := s.pool.QueryRow(ctx, `
       INSERT INTO sessions(user_id, refresh_hash, user_agent, ip, expires_at)
       VALUES($1, $2, $3, $4, $5)
       RETURNING id, user_id, refresh_hash, expires_at, revoked_at, created_at, user_agent, ip
   `, userID, refreshHash, userAgent, ip, expiresAt).Scan(
		&sess.ID, &sess.UserID, &sess.RefreshHash, &sess.ExpiresAt,
		&sess.RevokedAt, &sess.CreatedAt, &sess.UserAgent, &sess.IP,
	)
	if err != nil {
		var pgErr *pgconn.PgError
		if errors.As(err, &pgErr) && pgErr.Code == pgerrcode.UniqueViolation {
			return nil, ErrDuplicate
		}
		return nil, err
	}
	return &sess, nil
}

// GetSessionByRefreshHash returns a session by its refresh hash or ErrNotFound.
func (s *Store) GetSessionByRefreshHash(ctx context.Context, hash string) (*Session, error) {
	var sess Session
	err := s.pool.QueryRow(ctx, `
       SELECT id, user_id, refresh_hash, expires_at, revoked_at, created_at, user_agent, ip
       FROM sessions WHERE refresh_hash=$1
   `, hash).Scan(
		&sess.ID, &sess.UserID, &sess.RefreshHash, &sess.ExpiresAt,
		&sess.RevokedAt, &sess.CreatedAt, &sess.UserAgent, &sess.IP,
	)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, ErrNotFound
		}
		return nil, err
	}
	return &sess, nil
}

// RevokeSession sets revoked_at to now() for the given session ID.
func (s *Store) RevokeSession(ctx context.Context, id int64) error {
	_, err := s.pool.Exec(ctx, `
       UPDATE sessions SET revoked_at = now() WHERE id = $1
   `, id)
	return err
}

// RevokeAllSessions revokes all sessions for a given user.
func (s *Store) RevokeAllSessions(ctx context.Context, userID int64) error {
	_, err := s.pool.Exec(ctx, `
       UPDATE sessions SET revoked_at = now() WHERE user_id = $1
   `, userID)
	return err
}