package models

import (
	"fmt"
	"time"
)

// ReminderStage represents the stage of a task reminder
type ReminderStage string

const (
	// Pre-due date reminders (days before)
	ReminderStage30Days ReminderStage = "reminder_30d"
	ReminderStage14Days ReminderStage = "reminder_14d"
	ReminderStage7Days  ReminderStage = "reminder_7d"
	ReminderStage3Days  ReminderStage = "reminder_3d"
	ReminderStage1Day   ReminderStage = "reminder_1d"
	ReminderStageDayOf  ReminderStage = "day_of"

	// Overdue reminders (days after)
	ReminderStageOverdue1  ReminderStage = "overdue_1"
	ReminderStageOverdue2  ReminderStage = "overdue_2"
	ReminderStageOverdue3  ReminderStage = "overdue_3"
	ReminderStageOverdue4  ReminderStage = "overdue_4"
	ReminderStageOverdue7  ReminderStage = "overdue_7"
	ReminderStageOverdue10 ReminderStage = "overdue_10"
	ReminderStageOverdue13 ReminderStage = "overdue_13"
)

// GetReminderStageForDaysBefore returns the reminder stage for days before due date
func GetReminderStageForDaysBefore(days int) ReminderStage {
	switch days {
	case 30:
		return ReminderStage30Days
	case 14:
		return ReminderStage14Days
	case 7:
		return ReminderStage7Days
	case 3:
		return ReminderStage3Days
	case 1:
		return ReminderStage1Day
	case 0:
		return ReminderStageDayOf
	default:
		// For any other number of days, create a custom stage
		return ReminderStage(fmt.Sprintf("reminder_%dd", days))
	}
}

// GetReminderStageForDaysOverdue returns the reminder stage for days overdue
func GetReminderStageForDaysOverdue(days int) ReminderStage {
	switch days {
	case 1:
		return ReminderStageOverdue1
	case 2:
		return ReminderStageOverdue2
	case 3:
		return ReminderStageOverdue3
	case 4:
		return ReminderStageOverdue4
	case 7:
		return ReminderStageOverdue7
	case 10:
		return ReminderStageOverdue10
	case 13:
		return ReminderStageOverdue13
	default:
		// For any other overdue day, format as overdue_N
		return ReminderStage(fmt.Sprintf("overdue_%d", days))
	}
}

// TaskReminderLog tracks which reminders have been sent to prevent duplicates
type TaskReminderLog struct {
	ID             uint          `gorm:"primaryKey" json:"id"`
	TaskID         uint          `gorm:"column:task_id;not null;index:idx_reminderlog_task_user_date" json:"task_id"`
	Task           *Task         `gorm:"foreignKey:TaskID" json:"-"`
	UserID         uint          `gorm:"column:user_id;not null;index:idx_reminderlog_task_user_date" json:"user_id"`
	User           *User         `gorm:"foreignKey:UserID" json:"-"`
	DueDate        time.Time     `gorm:"column:due_date;type:date;not null;index:idx_reminderlog_task_user_date" json:"due_date"`
	ReminderStage  ReminderStage `gorm:"column:reminder_stage;size:20;not null" json:"reminder_stage"`
	SentAt         time.Time     `gorm:"column:sent_at;default:CURRENT_TIMESTAMP;index:idx_reminderlog_sent_at" json:"sent_at"`
	NotificationID *uint         `gorm:"column:notification_id" json:"notification_id"`
	Notification   *Notification `gorm:"foreignKey:NotificationID" json:"-"`
}

// TableName returns the table name for GORM
func (TaskReminderLog) TableName() string {
	return "task_reminderlog"
}