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/*
* Course groups
*
* Copyright (C) 2024 Runxi Yu <https://runxiyu.org>
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"context"
"fmt"
)
type userCourseGroupsT map[courseGroupT]struct{}
type courseGroupT string
func checkCourseGroup(cg courseGroupT) bool {
_, ok := courseGroups[cg]
return ok
}
const (
mw1 courseGroupT = "MW1"
mw2 courseGroupT = "MW2"
mw3 courseGroupT = "MW3"
tt1 courseGroupT = "TT1"
tt2 courseGroupT = "TT2"
tt3 courseGroupT = "TT3"
)
var courseGroups = map[courseGroupT]string{
mw1: "Monday/Wednesday CCA1",
mw2: "Monday/Wednesday CCA2",
mw3: "Monday/Wednesday CCA3",
tt1: "Tuesday/Thursday CCA1",
tt2: "Tuesday/Thursday CCA2",
tt3: "Tuesday/Thursday CCA3",
}
func populateUserCourseGroups(
ctx context.Context,
userCourseGroups *userCourseGroupsT,
userID string,
) error {
rows, err := db.Query(
ctx,
"SELECT courseid FROM choices WHERE userid = $1",
userID,
)
if err != nil {
return wrapError(
errUnexpectedDBError,
err,
)
}
for {
if !rows.Next() {
err := rows.Err()
if err != nil {
return wrapError(
errUnexpectedDBError,
err,
)
}
break
}
var thisCourseID int
err := rows.Scan(&thisCourseID)
if err != nil {
return wrapError(
errUnexpectedDBError,
err,
)
}
var thisGroupName courseGroupT
_course, ok := courses.Load(thisCourseID)
if !ok {
return fmt.Errorf(
"%w: %d",
errNoSuchCourse,
thisCourseID,
)
}
course, ok := _course.(*courseT)
if !ok {
panic("courses map has non-\"*courseT\" items")
}
thisGroupName = course.Group
if _, ok := (*userCourseGroups)[thisGroupName]; ok {
return fmt.Errorf(
"%w: user %v, group %v",
errMultipleChoicesInOneGroup,
userID,
thisGroupName,
)
}
(*userCourseGroups)[thisGroupName] = struct{}{}
}
return nil
}
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