繰り返し追加機能の追加

internal/models/recurring_assignment.go

@@ -0,0 +1,102 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+const (
+	RecurrenceNone    = "none"
+	RecurrenceDaily   = "daily"
+	RecurrenceWeekly  = "weekly"
+	RecurrenceMonthly = "monthly"
+)
+
+const (
+	EndTypeNever = "never"
+	EndTypeCount = "count"
+	EndTypeDate  = "date"
+)
+
+const (
+	EditBehaviorThisOnly      = "this_only"
+	EditBehaviorThisAndFuture = "this_and_future"
+	EditBehaviorAll           = "all"
+)
+
+type RecurringAssignment struct {
+	ID          uint   `gorm:"primarykey" json:"id"`
+	UserID      uint   `gorm:"not null;index" json:"user_id"`
+	Title       string `gorm:"not null" json:"title"`
+	Description string `json:"description"`
+	Subject     string `json:"subject"`
+	Priority    string `gorm:"not null;default:medium" json:"priority"`
+
+	RecurrenceType     string `gorm:"not null;default:none" json:"recurrence_type"`
+	RecurrenceInterval int    `gorm:"not null;default:1" json:"recurrence_interval"`
+	RecurrenceWeekday  *int   `json:"recurrence_weekday,omitempty"`
+	RecurrenceDay      *int   `json:"recurrence_day,omitempty"`
+	DueTime            string `gorm:"not null" json:"due_time"`
+
+	EndType        string     `gorm:"not null;default:never" json:"end_type"`
+	EndCount       *int       `json:"end_count,omitempty"`
+	EndDate        *time.Time `json:"end_date,omitempty"`
+	GeneratedCount int        `gorm:"default:0" json:"generated_count"`
+	EditBehavior   string     `gorm:"not null;default:this_only" json:"edit_behavior"`
+
+	ReminderEnabled       bool           `gorm:"default:false" json:"reminder_enabled"`
+	ReminderOffset        *int           `json:"reminder_offset,omitempty"`
+	UrgentReminderEnabled bool           `gorm:"default:true" json:"urgent_reminder_enabled"`
+	IsActive              bool           `gorm:"default:true" json:"is_active"`
+	CreatedAt             time.Time      `json:"created_at"`
+	UpdatedAt             time.Time      `json:"updated_at"`
+	DeletedAt             gorm.DeletedAt `gorm:"index" json:"-"`
+
+	User        *User        `gorm:"foreignKey:UserID" json:"user,omitempty"`
+	Assignments []Assignment `gorm:"foreignKey:RecurringAssignmentID" json:"assignments,omitempty"`
+}
+
+func (r *RecurringAssignment) ShouldGenerateNext() bool {
+	if !r.IsActive || r.RecurrenceType == RecurrenceNone {
+		return false
+	}
+
+	switch r.EndType {
+	case EndTypeCount:
+		if r.EndCount != nil && r.GeneratedCount >= *r.EndCount {
+			return false
+		}
+	case EndTypeDate:
+		if r.EndDate != nil && time.Now().After(*r.EndDate) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func (r *RecurringAssignment) CalculateNextDueDate(lastDueDate time.Time) time.Time {
+	var nextDate time.Time
+
+	switch r.RecurrenceType {
+	case RecurrenceDaily:
+		nextDate = lastDueDate.AddDate(0, 0, r.RecurrenceInterval)
+	case RecurrenceWeekly:
+		nextDate = lastDueDate.AddDate(0, 0, 7*r.RecurrenceInterval)
+	case RecurrenceMonthly:
+		nextDate = lastDueDate.AddDate(0, r.RecurrenceInterval, 0)
+		if r.RecurrenceDay != nil {
+			day := *r.RecurrenceDay
+			lastDayOfMonth := time.Date(nextDate.Year(), nextDate.Month()+1, 0, 0, 0, 0, 0, nextDate.Location()).Day()
+			if day > lastDayOfMonth {
+				day = lastDayOfMonth
+			}
+			nextDate = time.Date(nextDate.Year(), nextDate.Month(), day, nextDate.Hour(), nextDate.Minute(), 0, 0, nextDate.Location())
+		}
+	default:
+		return lastDueDate
+	}
+
+	return nextDate
+}