core v1

server/internal/db/active_class.go

@@ -0,0 +1,96 @@
+package db
+
+import (
+	"strconv"
+	"strings"
+	"time"
+
+	"server/internal/models"
+
+	"gorm.io/gorm"
+)
+
+func scheduleDayIndex(t time.Time) int {
+	wd := t.Weekday()
+	if wd == time.Sunday {
+		return 6
+	}
+	return int(wd) - 1
+}
+
+func parseTimeMinutes(tStr string) int {
+	parts := strings.Split(tStr, ":")
+	if len(parts) != 2 {
+		return 0
+	}
+	hours, _ := strconv.Atoi(parts[0])
+	mins, _ := strconv.Atoi(parts[1])
+	return hours*60 + mins
+}
+
+func studentClassIDs(db *gorm.DB, studentRkID int64) []int64 {
+	var classRkIDs []int64
+	_ = db.Model(&models.ClassStudent{}).
+		Where("student_rk_id = ?", studentRkID).
+		Pluck("class_rk_id", &classRkIDs).Error
+	return classRkIDs
+}
+
+// FindActiveClassAndPeriodForStudent trả về lớp + ca đang trong khung giờ học.
+func FindActiveClassAndPeriodForStudent(db *gorm.DB, studentRkID int64) (int64, int) {
+	classRkIDs := studentClassIDs(db, studentRkID)
+	if len(classRkIDs) == 0 {
+		return 0, 0
+	}
+
+	var schedules []models.ClassSchedule
+	if err := db.Where("class_rk_id IN ? AND is_active = ?", classRkIDs, true).Find(&schedules).Error; err != nil || len(schedules) == 0 {
+		return classRkIDs[0], 1
+	}
+
+	now := time.Now()
+	day := scheduleDayIndex(now)
+	currMin := now.Hour()*60 + now.Minute()
+
+	for _, s := range schedules {
+		if s.DayOfWeek != day {
+			continue
+		}
+		startMin := parseTimeMinutes(s.StartTime)
+		endMin := parseTimeMinutes(s.EndTime)
+		if currMin >= startMin && currMin <= endMin {
+			period := s.Period
+			if period < 1 {
+				period = 1
+			}
+			return s.ClassRkID, period
+		}
+	}
+
+	return classRkIDs[0], 1
+}
+
+func FindActiveClassForStudent(db *gorm.DB, studentRkID int64) int64 {
+	classID, _ := FindActiveClassAndPeriodForStudent(db, studentRkID)
+	return classID
+}
+
+// ResolveSessionPeriodForDate lấy ca theo ngày (dùng khi xem nhật ký quá khứ).
+func ResolveSessionPeriodForDate(db *gorm.DB, classRkID int64, date string, period int) int {
+	if period > 0 {
+		return period
+	}
+	day, err := time.Parse("2006-01-02", date)
+	if err != nil {
+		return 1
+	}
+	var slots []models.ClassSchedule
+	if err := db.Where("class_rk_id = ? AND day_of_week = ? AND is_active = ?", classRkID, scheduleDayIndex(day), true).
+		Order("period asc, start_time asc").Find(&slots).Error; err != nil || len(slots) == 0 {
+		return 1
+	}
+	if slots[0].Period > 0 {
+		return slots[0].Period
+	}
+	return 1
+}