wsmsg_confirm.go

/*
 * Handle the "C" message
 *
 * Copyright (C) 2024  Runxi Yu <https://runxiyu.org>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

package main

import (
	"context"
	"fmt"
	"sync/atomic"

	"github.com/coder/websocket"
)

func messageConfirm(
	ctx context.Context,
	c *websocket.Conn,
	mar []string,
	userID string,
	department string,
	userCourseTypes *userCourseTypesT,
) error {
	_ = mar

	_state, ok := states[department]
	if !ok {
		return errNoSuchYearGroup
	}
	if atomic.LoadUint32(_state) != 2 {
		err := writeText(ctx, c, "E :Course selections are not open")
		if err != nil {
			return wrapError(
				errCannotSend,
				err,
			)
		}
		return nil
	}

	select {
	case <-ctx.Done():
		return wrapError(
			errWsHandlerContextCanceled,
			ctx.Err(),
		)
	default:
	}

	for courseType := range courseTypes {
		minimum, err := getCourseTypeMinimumForYearGroup(
			department,
			courseType,
		)
		if err != nil {
			return wrapError(errInvalidYearGroupOrCourseType, err)
		}
		if (*userCourseTypes)[courseType] < minimum {
			return writeText(
				ctx,
				c,
				fmt.Sprintf(
					"RC :Cannot confirm choices: You chose %d out of required %d of type %s",
					(*userCourseTypes)[courseType],
					minimum,
					courseType,
				),
			)
		}
	}

	_, err := db.Exec(
		ctx,
		"UPDATE users SET confirmed = true WHERE id = $1",
		userID,
	)
	if err != nil {
		return wrapError(errUnexpectedDBError, err)
	}

	return writeText(
		ctx,
		c,
		"YC",
	)
}