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path: root/internal/handlers/timeline_logic.go
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package handlers

import (
	"context"
	"sort"
	"time"

	"task-dashboard/internal/api"
	"task-dashboard/internal/models"
	"task-dashboard/internal/store"
)

// BuildTimeline aggregates and normalizes data into a timeline structure
func BuildTimeline(ctx context.Context, s *store.Store, calendarClient api.GoogleCalendarAPI, start, end time.Time) ([]models.TimelineItem, error) {
	var items []models.TimelineItem

	// 1. Fetch Tasks
	tasks, err := s.GetTasksByDateRange(start, end)
	if err != nil {
		return nil, err
	}
	for _, task := range tasks {
		if task.DueDate == nil {
			continue
		}
		items = append(items, models.TimelineItem{
			ID:           task.ID,
			Type:         models.TimelineItemTypeTask,
			Title:        task.Content,
			Time:         *task.DueDate,
			Description:  task.Description,
			URL:          task.URL,
			OriginalItem: task,
		})
	}

	// 2. Fetch Meals
	meals, err := s.GetMealsByDateRange(start, end)
	if err != nil {
		return nil, err
	}
	for _, meal := range meals {
		mealTime := meal.Date
		// Apply Meal Defaults
		switch meal.MealType {
		case "breakfast":
			mealTime = time.Date(mealTime.Year(), mealTime.Month(), mealTime.Day(), 8, 0, 0, 0, mealTime.Location())
		case "lunch":
			mealTime = time.Date(mealTime.Year(), mealTime.Month(), mealTime.Day(), 12, 0, 0, 0, mealTime.Location())
		case "dinner":
			mealTime = time.Date(mealTime.Year(), mealTime.Month(), mealTime.Day(), 19, 0, 0, 0, mealTime.Location())
		default:
			mealTime = time.Date(mealTime.Year(), mealTime.Month(), mealTime.Day(), 12, 0, 0, 0, mealTime.Location())
		}

		items = append(items, models.TimelineItem{
			ID:           meal.ID,
			Type:         models.TimelineItemTypeMeal,
			Title:        meal.RecipeName,
			Time:         mealTime,
			URL:          meal.RecipeURL,
			OriginalItem: meal,
		})
	}

	// 3. Fetch Cards
	cards, err := s.GetCardsByDateRange(start, end)
	if err != nil {
		return nil, err
	}
	for _, card := range cards {
		if card.DueDate == nil {
			continue
		}
		items = append(items, models.TimelineItem{
			ID:           card.ID,
			Type:         models.TimelineItemTypeCard,
			Title:        card.Name,
			Time:         *card.DueDate,
			URL:          card.URL,
			OriginalItem: card,
		})
	}

	// 4. Fetch Events
	if calendarClient != nil {
		events, err := calendarClient.GetEventsByDateRange(ctx, start, end)
		if err == nil {
			for _, event := range events {
				items = append(items, models.TimelineItem{
					ID:           event.ID,
					Type:         models.TimelineItemTypeEvent,
					Title:        event.Summary,
					Time:         event.Start,
					EndTime:      &event.End,
					Description:  event.Description,
					URL:          event.HTMLLink,
					OriginalItem: event,
				})
			}
		}
	}

	// Sort items by Time
	sort.Slice(items, func(i, j int) bool {
		return items[i].Time.Before(items[j].Time)
	})

	return items, nil
}