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

import (
	"log"
	"sort"

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

// BuildUnifiedAtomList creates a list of atoms from tasks, cards, and google tasks
func BuildUnifiedAtomList(s *store.Store) ([]models.Atom, []models.Board, error) {
	tasks, err := s.GetTasks()
	if err != nil {
		return nil, nil, err
	}

	boards, err := s.GetBoards()
	if err != nil {
		return nil, nil, err
	}

	gTasks, err := s.GetGoogleTasks()
	if err != nil {
		// Log but don't fail if gtasks fails (might be new/not configured)
		log.Printf("Warning: failed to fetch cached google tasks: %v", err)
	}

	atoms := make([]models.Atom, 0, len(tasks)+len(gTasks))

	// Add incomplete tasks
	for _, task := range tasks {
		if !task.Completed {
			atoms = append(atoms, models.TaskToAtom(task))
		}
	}

	// Add incomplete google tasks
	for _, gTask := range gTasks {
		if !gTask.Completed {
			atoms = append(atoms, models.GoogleTaskToAtom(gTask))
		}
	}

	// Add cards with due dates or from actionable lists
	for _, board := range boards {
		for _, card := range board.Cards {
			if card.DueDate != nil || isActionableList(card.ListName) {
				atoms = append(atoms, models.CardToAtom(card))
			}
		}
	}

	// Compute UI fields for all atoms
	for i := range atoms {
		atoms[i].ComputeUIFields()
	}

	return atoms, boards, nil
}

// SortAtomsByUrgency sorts atoms by urgency tier, then due date, then priority
func SortAtomsByUrgency(atoms []models.Atom) {
	sort.SliceStable(atoms, func(i, j int) bool {
		tierI := atomUrgencyTier(atoms[i])
		tierJ := atomUrgencyTier(atoms[j])

		if tierI != tierJ {
			return tierI < tierJ
		}

		if atoms[i].DueDate != nil && atoms[j].DueDate != nil {
			if !atoms[i].DueDate.Equal(*atoms[j].DueDate) {
				return atoms[i].DueDate.Before(*atoms[j].DueDate)
			}
		}

		return atoms[i].Priority > atoms[j].Priority
	})
}

// PartitionAtomsByTime separates atoms into current and future lists
// Recurring tasks that are future are excluded entirely
func PartitionAtomsByTime(atoms []models.Atom) (current, future []models.Atom) {
	for _, a := range atoms {
		// Don't show recurring tasks until the day they're due
		if a.IsRecurring && a.IsFuture {
			continue
		}
		if a.IsFuture {
			future = append(future, a)
		} else {
			current = append(current, a)
		}
	}
	return
}

// atomUrgencyTier returns an urgency tier for sorting:
// 0 = overdue, 1 = today with specific time, 2 = today no time, 3 = future, 4 = no due date
func atomUrgencyTier(a models.Atom) int {
	if a.DueDate == nil {
		return 4
	}
	if a.IsOverdue {
		return 0
	}
	if a.IsFuture {
		return 3
	}
	if a.HasSetTime {
		return 1
	}
	return 2
}