Implement Application Layer with TDD

- Add date utilities for habit scheduling logic - Implement CreateHabitHandler with full validation - Implement GetTodaysHabitsHandler with carry-over support - Implement MarkHabitHandler for completing habits - All components developed following TDD methodology - Complete test coverage for commands and queries
2025-11-25 23:54:49 +01:00
parent 0977d3a58b
commit 34ea1f718e
8 changed files with 1002 additions and 0 deletions
@@ -0,0 +1,31 @@
+package utils
+
+import "time"
+
+func ShouldAppearToday(
+	frequency string,
+	specificDays []int,
+	specificDates []int,
+	targetDate time.Time,
+) bool {
+	switch frequency {
+	case "DAILY":
+		return true
+	case "WEEKLY":
+		weekday := int(targetDate.Weekday())
+		return contains(specificDays, weekday)
+	case "MONTHLY":
+		day := targetDate.Day()
+		return contains(specificDates, day)
+	}
+	return false
+}
+
+func contains(slice []int, val int) bool {
+	for _, item := range slice {
+		if item == val {
+			return true
+		}
+	}
+	return false
+}
@@ -0,0 +1,107 @@
+package utils
+
+import (
+	"testing"
+	"time"
+)
+
+func TestShouldAppearToday_Daily(t *testing.T) {
+	// Daily habits should always appear
+	result := ShouldAppearToday("DAILY", nil, nil, time.Now())
+	if !result {
+		t.Error("Daily habit should appear every day")
+	}
+}
+
+func TestShouldAppearToday_Weekly(t *testing.T) {
+	tests := []struct {
+		name         string
+		specificDays []int
+		targetDate   time.Time
+		expected     bool
+	}{
+		{
+			name:         "Monday when Monday is specified",
+			specificDays: []int{1}, // Monday
+			targetDate:   time.Date(2025, 1, 6, 0, 0, 0, 0, time.UTC), // Monday
+			expected:     true,
+		},
+		{
+			name:         "Tuesday when Monday is specified",
+			specificDays: []int{1}, // Monday
+			targetDate:   time.Date(2025, 1, 7, 0, 0, 0, 0, time.UTC), // Tuesday
+			expected:     false,
+		},
+		{
+			name:         "Wednesday when Mon/Wed/Fri specified",
+			specificDays: []int{1, 3, 5}, // Mon, Wed, Fri
+			targetDate:   time.Date(2025, 1, 8, 0, 0, 0, 0, time.UTC), // Wednesday
+			expected:     true,
+		},
+		{
+			name:         "Sunday when Mon/Wed/Fri specified",
+			specificDays: []int{1, 3, 5}, // Mon, Wed, Fri
+			targetDate:   time.Date(2025, 1, 5, 0, 0, 0, 0, time.UTC), // Sunday
+			expected:     false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := ShouldAppearToday("WEEKLY", tt.specificDays, nil, tt.targetDate)
+			if result != tt.expected {
+				t.Errorf("Expected %v, got %v for %s", tt.expected, result, tt.targetDate.Weekday())
+			}
+		})
+	}
+}
+
+func TestShouldAppearToday_Monthly(t *testing.T) {
+	tests := []struct {
+		name          string
+		specificDates []int
+		targetDate    time.Time
+		expected      bool
+	}{
+		{
+			name:          "1st of month when 1st is specified",
+			specificDates: []int{1},
+			targetDate:    time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC),
+			expected:      true,
+		},
+		{
+			name:          "2nd of month when 1st is specified",
+			specificDates: []int{1},
+			targetDate:    time.Date(2025, 1, 2, 0, 0, 0, 0, time.UTC),
+			expected:      false,
+		},
+		{
+			name:          "15th when 1st/15th/30th specified",
+			specificDates: []int{1, 15, 30},
+			targetDate:    time.Date(2025, 1, 15, 0, 0, 0, 0, time.UTC),
+			expected:      true,
+		},
+		{
+			name:          "10th when 1st/15th/30th specified",
+			specificDates: []int{1, 15, 30},
+			targetDate:    time.Date(2025, 1, 10, 0, 0, 0, 0, time.UTC),
+			expected:      false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := ShouldAppearToday("MONTHLY", nil, tt.specificDates, tt.targetDate)
+			if result != tt.expected {
+				t.Errorf("Expected %v, got %v for day %d", tt.expected, result, tt.targetDate.Day())
+			}
+		})
+	}
+}
+
+func TestShouldAppearToday_InvalidFrequency(t *testing.T) {
+	result := ShouldAppearToday("INVALID", nil, nil, time.Now())
+	if result {
+		t.Error("Invalid frequency should return false")
+	}
+}