package api

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

	"git.dubyatp.xyz/dubyatp/scannerbot/server/db"
	"github.com/gocql/gocql"
)

func dbGetUser(id string) (*User, error) {
	query := `SELECT id, name, password FROM users WHERE id = ?`
	var user User
	var gid gocql.UUID
	err := db.Session.Query(query, id).Scan(&gid, &user.Name, &user.Password)
	user.ID = [16]byte(gid)

	if err == gocql.ErrNotFound {
		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 = ?`
	var user User
	var gid gocql.UUID
	err := db.Session.Query(query, username).Scan(&gid, &user.Name, &user.Password)
	user.ID = [16]byte(gid)

	if err == gocql.ErrNotFound {
		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`
	iter := db.Session.Query(query).Iter()
	defer iter.Close()

	var users []*User
	for {
		user := &User{}
		var gid gocql.UUID
		if !iter.Scan(&gid, &user.Name, &user.Password) {
			break
		}
		user.ID = [16]byte(gid)
		users = append(users, user)
	}
	if err := iter.Close(); err != nil {
		slog.Error("db: failed to iterate users", "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 (?, ?, ?)`
	err := db.Session.Query(query, gocql.UUID(user.ID), user.Name, user.Password).Exec()
	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
}