package api

import (
	"context"
	"errors"
	"fmt"
	"log/slog"

	"git.dubyatp.xyz/dubyatp/scannerbot/server/db"
	"github.com/jackc/pgx/v5"
)

func dbGetUser(id string) (*User, error) {
	query := `SELECT id, name, password FROM users WHERE id = $1`
	var user User
	err := db.Pool.QueryRow(context.Background(), query, id).Scan(&user.ID, &user.Name, &user.Password)
	if errors.Is(err, pgx.ErrNoRows) {
		slog.Debug("db: user not found", "userid", id)
		return nil, errors.New("user not found")
	} else if err != nil {
		slog.Error("db: failed to query user", "error", err)
		return nil, fmt.Errorf("failed to query user")
	}

	slog.Debug("db: user found", "userid", user.ID, "username", user.Name)
	return &user, nil
}

func dbGetUserByName(username string) (*User, error) {
	query := `SELECT id, name, password FROM users WHERE name = $1`
	var user User
	err := db.Pool.QueryRow(context.Background(), query, username).Scan(&user.ID, &user.Name, &user.Password)
	if errors.Is(err, pgx.ErrNoRows) {
		slog.Debug("db: user not found", "username", username)
		return nil, errors.New("user not found")
	} else if err != nil {
		slog.Error("db: failed to query user", "error", err)
		return nil, fmt.Errorf("failed to query user")
	}

	slog.Debug("db: user found", "userid", user.ID, "username", user.Name)
	return &user, nil
}

func dbGetAllUsers() ([]*User, error) {
	query := `SELECT id, name, password FROM users`
	rows, err := db.Pool.Query(context.Background(), query)
	if err != nil {
		slog.Error("db: failed to query users", "error", err)
		return nil, fmt.Errorf("failed to query users")
	}
	defer rows.Close()

	var users []*User
	for rows.Next() {
		user := &User{}
		if err := rows.Scan(&user.ID, &user.Name, &user.Password); err != nil {
			slog.Error("db: failed to scan user", "error", err)
			return nil, fmt.Errorf("failed to scan user")
		}
		users = append(users, user)
	}
	if err := rows.Err(); err != nil {
		slog.Error("db: row iteration error", "error", err)
		return nil, fmt.Errorf("failed to iterate users")
	}
	if len(users) == 0 {
		slog.Debug("db: no users found")
		return nil, errors.New("no users found")
	}

	slog.Debug("db: user list returned")
	return users, nil
}

func dbAddUser(user *User) error {
	query := `INSERT INTO users (id, name, password) VALUES ($1, $2, $3)`
	_, err := db.Pool.Exec(context.Background(), query, user.ID, user.Name, user.Password)
	if err != nil {
		slog.Error("db: failed to add user", "error", err, "userid", user.ID, "username", user.Name)
		return fmt.Errorf("failed to add user")
	}

	slog.Debug("db: user added", "userid", user.ID, "username", user.Name)
	return nil
}