package models

import (
	"time"

	"task-dashboard/internal/config"
)

type TimelineItemType string

const (
	TimelineItemTypeTask   TimelineItemType = "task"
	TimelineItemTypeMeal   TimelineItemType = "meal"
	TimelineItemTypeCard   TimelineItemType = "card"
	TimelineItemTypeEvent  TimelineItemType = "event"
	TimelineItemTypeGTask  TimelineItemType = "gtask" // Google Tasks
)

type DaySection string

const (
	DaySectionToday    DaySection = "today"
	DaySectionTomorrow DaySection = "tomorrow"
	DaySectionLater    DaySection = "later"
)

type TimelineItem struct {
	ID           string           `json:"id"`
	Type         TimelineItemType `json:"type"`
	Title        string           `json:"title"`
	Time         time.Time        `json:"time"`
	EndTime      *time.Time       `json:"end_time,omitempty"`
	Description  string           `json:"description,omitempty"`
	URL          string           `json:"url,omitempty"`
	OriginalItem interface{}      `json:"-"`

	// UI enhancement fields
	IsCompleted bool       `json:"is_completed"`
	IsOverdue   bool       `json:"is_overdue"`
	IsAllDay    bool       `json:"is_all_day"` // True if time is midnight (no specific time)
	DaySection  DaySection `json:"day_section"`
	Source      string     `json:"source"` // "todoist", "trello", "plantoeat", "calendar", "gtasks"

	// Source-specific metadata
	ListID string `json:"list_id,omitempty"` // For Google Tasks
}

// ComputeDaySection sets the DaySection, IsOverdue, and IsAllDay based on the item's time
func (item *TimelineItem) ComputeDaySection(now time.Time) {
	// Use configured display timezone for consistent comparisons
	tz := config.GetDisplayTimezone()
	localNow := now.In(tz)
	localItemTime := item.Time.In(tz)

	today := time.Date(localNow.Year(), localNow.Month(), localNow.Day(), 0, 0, 0, 0, tz)
	tomorrow := today.AddDate(0, 0, 1)
	dayAfterTomorrow := today.AddDate(0, 0, 2)

	itemDay := time.Date(localItemTime.Year(), localItemTime.Month(), localItemTime.Day(), 0, 0, 0, 0, tz)

	// Check if item is overdue (before today)
	item.IsOverdue = itemDay.Before(today)

	// Check if item is all-day (midnight time means no specific time)
	item.IsAllDay = localItemTime.Hour() == 0 && localItemTime.Minute() == 0

	if itemDay.Before(tomorrow) {
		item.DaySection = DaySectionToday
	} else if itemDay.Before(dayAfterTomorrow) {
		item.DaySection = DaySectionTomorrow
	} else {
		item.DaySection = DaySectionLater
	}
}