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

import (
	"context"
	"log"
	"sort"
	"strings"
	"time"

	"task-dashboard/internal/api"
	"task-dashboard/internal/config"
	"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, tasksClient api.GoogleTasksAPI, start, end time.Time) ([]models.TimelineItem, error) {
	var items []models.TimelineItem
	now := config.Now()

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

	// 2. Fetch Meals - combine multiple items for same date+mealType
	meals, err := s.GetMealsByDateRange(start, end)
	if err != nil {
		return nil, err
	}

	// Group meals by date+mealType key
	type mealKey struct {
		date     string
		mealType string
	}
	mealGroups := make(map[mealKey][]models.Meal)
	for _, meal := range meals {
		key := mealKey{
			date:     meal.Date.Format("2006-01-02"),
			mealType: meal.MealType,
		}
		mealGroups[key] = append(mealGroups[key], meal)
	}

	// Create combined timeline items for each group
	for _, group := range mealGroups {
		if len(group) == 0 {
			continue
		}

		// Use first meal as base
		firstMeal := group[0]
		mealTime := firstMeal.Date

		// Apply Meal time defaults
		switch firstMeal.MealType {
		case "breakfast":
			mealTime = time.Date(mealTime.Year(), mealTime.Month(), mealTime.Day(), config.BreakfastHour, 0, 0, 0, mealTime.Location())
		case "lunch":
			mealTime = time.Date(mealTime.Year(), mealTime.Month(), mealTime.Day(), config.LunchHour, 0, 0, 0, mealTime.Location())
		case "dinner":
			mealTime = time.Date(mealTime.Year(), mealTime.Month(), mealTime.Day(), config.DinnerHour, 0, 0, 0, mealTime.Location())
		default:
			mealTime = time.Date(mealTime.Year(), mealTime.Month(), mealTime.Day(), config.LunchHour, 0, 0, 0, mealTime.Location())
		}

		// Combine recipe names with " + "
		var names []string
		for _, m := range group {
			names = append(names, m.RecipeName)
		}
		combinedTitle := strings.Join(names, " + ")

		item := models.TimelineItem{
			ID:           firstMeal.ID,
			Type:         models.TimelineItemTypeMeal,
			Title:        combinedTitle,
			Time:         mealTime,
			URL:          firstMeal.RecipeURL, // Use first meal's URL
			OriginalItem: group,               // Store all meals
			IsCompleted:  false,
			Source:       "plantoeat",
		}
		item.ComputeDaySection(now)
		items = append(items, item)
	}

	// 3. Fetch Cards
	cards, err := s.GetCardsByDateRange(start, end)
	if err != nil {
		return nil, err
	}
	for _, card := range cards {
		if card.DueDate == nil {
			continue
		}
		item := models.TimelineItem{
			ID:           card.ID,
			Type:         models.TimelineItemTypeCard,
			Title:        card.Name,
			Time:         *card.DueDate,
			URL:          card.URL,
			OriginalItem: card,
			IsCompleted:  false, // Cards in timeline are not completed (closed cards filtered out)
			Source:       "trello",
		}
		item.ComputeDaySection(now)
		items = append(items, item)
	}

	// 4. Fetch Events
	if calendarClient != nil {
		events, err := calendarClient.GetEventsByDateRange(ctx, start, end)
		if err != nil {
			log.Printf("Warning: failed to fetch calendar events: %v", err)
		} else {
			for _, event := range events {
				endTime := event.End
				item := models.TimelineItem{
					ID:           event.ID,
					Type:         models.TimelineItemTypeEvent,
					Title:        event.Summary,
					Time:         event.Start,
					EndTime:      &endTime,
					Description:  event.Description,
					URL:          event.HTMLLink,
					OriginalItem: event,
					IsCompleted:  false,
					Source:       "calendar",
				}
				item.ComputeDaySection(now)
				items = append(items, item)
			}
		}
	}

	// 5. Fetch Google Tasks
	if tasksClient != nil {
		gTasks, err := tasksClient.GetTasksByDateRange(ctx, start, end)
		if err != nil {
			log.Printf("Warning: failed to fetch Google Tasks: %v", err)
		} else {
			log.Printf("Google Tasks: fetched %d tasks in date range", len(gTasks))
			for _, gTask := range gTasks {
				// Tasks without due date are placed in today section
				taskTime := now
				if gTask.DueDate != nil {
					taskTime = *gTask.DueDate
				}
				item := models.TimelineItem{
					ID:           gTask.ID,
					Type:         models.TimelineItemTypeGTask,
					Title:        gTask.Title,
					Time:         taskTime,
					Description:  gTask.Notes,
					URL:          gTask.URL,
					OriginalItem: gTask,
					IsCompleted:  gTask.Completed,
					Source:       "gtasks",
					ListID:       gTask.ListID,
				}
				item.ComputeDaySection(now)
				items = append(items, item)
			}
		}
	} else {
		log.Printf("Google Tasks client not configured")
	}

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

	return items, nil
}