package users_repo

import (
	"context"
	"errors"
	"evening_detective_server/internal/repos"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"
)

var (
	ErrUserNotFound = errors.New("Пользователь не найден")
)

type UsersRepo struct {
	pool *pgxpool.Pool
}

func NewUserRepo(pool *pgxpool.Pool) *UsersRepo {
	return &UsersRepo{
		pool: pool,
	}
}

func (s *UsersRepo) AddUser(
	ctx context.Context,
	username string,
	email string,
	passwordHash string,
	roles []string,
) error {
	tag, err := s.pool.Exec(
		ctx,
		`INSERT INTO users (username, email, password_hash, roles)
		SELECT $1, $2, $3, $4
		WHERE NOT EXISTS (
			SELECT 1 FROM users 
			WHERE username = $5 OR email = $6
		)`,
		username,
		email,
		passwordHash,
		roles,

		username,
		email,
	)
	if err != nil {
		return err
	}
	if tag.RowsAffected() == 0 {
		return errors.New("username или email уже используется")
	}
	return nil
}

func (s *UsersRepo) UpdateUserPassword(
	ctx context.Context,
	email string,
	passwordHash string,
) error {
	tag, err := s.pool.Exec(
		ctx,
		`UPDATE users
		SET password_hash = $1
		WHERE email = $2`,
		passwordHash,
		email,
	)
	if err != nil {
		return err
	}
	if tag.RowsAffected() == 0 {
		return ErrUserNotFound
	}

	return nil
}

func (s *UsersRepo) GetUserByEmail(
	ctx context.Context,
	email string,
) (*repos.User, error) {
	user := &repos.User{}
	row := s.pool.QueryRow(
		ctx,
		`SELECT id, username, email, password_hash, roles, is_active
		FROM users
		WHERE email = $1`,
		email,
	)
	err := row.Scan(
		&user.ID,
		&user.Username,
		&user.Email,
		&user.PasswordHash,
		&user.Roles,
		&user.IsActive,
	)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, ErrUserNotFound
		}
		return nil, err
	}

	return user, nil
}

func (s *UsersRepo) GetUserByID(
	ctx context.Context,
	id int,
) (*repos.User, error) {
	user := &repos.User{}
	row := s.pool.QueryRow(
		ctx,
		`SELECT id, username, email, password_hash, roles, is_active
		FROM users
		WHERE id = $1`,
		id,
	)
	err := row.Scan(
		&user.ID,
		&user.Username,
		&user.Email,
		&user.PasswordHash,
		&user.Roles,
		&user.IsActive,
	)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, ErrUserNotFound
		}
		return nil, err
	}

	return user, nil
}

func (s *UsersRepo) GetUsers(
	ctx context.Context,
) ([]*repos.User, error) {
	rows, err := s.pool.Query(
		ctx,
		`SELECT id, username, email, roles, is_active, created_at
		FROM users
		ORDER BY created_at DESC`,
	)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var users []*repos.User
	for rows.Next() {
		user := &repos.User{}
		err := rows.Scan(
			&user.ID,
			&user.Username,
			&user.Email,
			&user.Roles,
			&user.IsActive,
			&user.CreatedAt,
		)
		if err != nil {
			return nil, err
		}
		users = append(users, user)
	}

	if err := rows.Err(); err != nil {
		return nil, err
	}

	return users, nil
}