package model

import (
	"database/sql"
	"testing"
	"time"
)

func TestHabit_ProcessForJSON(t *testing.T) {
	t.Run("with reminder time RFC3339 format", func(t *testing.T) {
		h := &Habit{
			ReminderTime: sql.NullString{String: "0000-01-01T19:00:00Z", Valid: true},
			StartDate:    sql.NullTime{Time: time.Date(2025, 1, 15, 0, 0, 0, 0, time.UTC), Valid: true},
		}
		h.ProcessForJSON()

		// Note: ProcessForJSON returns early after parsing RFC3339, so StartDate is NOT processed
		if h.ReminderTimeStr == nil || *h.ReminderTimeStr != "19:00" {
			t.Errorf("expected 19:00, got %v", h.ReminderTimeStr)
		}
	})

	t.Run("with reminder time HH:MM:SS format and start date", func(t *testing.T) {
		h := &Habit{
			ReminderTime: sql.NullString{String: "08:30:00", Valid: true},
			StartDate:    sql.NullTime{Time: time.Date(2025, 1, 15, 0, 0, 0, 0, time.UTC), Valid: true},
		}
		h.ProcessForJSON()

		if h.ReminderTimeStr == nil || *h.ReminderTimeStr != "08:30" {
			t.Errorf("expected 08:30, got %v", h.ReminderTimeStr)
		}
		if h.StartDateStr == nil || *h.StartDateStr != "2025-01-15" {
			t.Errorf("expected 2025-01-15, got %v", h.StartDateStr)
		}
	})

	t.Run("without reminder time", func(t *testing.T) {
		h := &Habit{
			ReminderTime: sql.NullString{Valid: false},
			StartDate:    sql.NullTime{Valid: false},
		}
		h.ProcessForJSON()

		if h.ReminderTimeStr != nil {
			t.Error("reminder_time should be nil")
		}
		if h.StartDateStr != nil {
			t.Error("start_date should be nil")
		}
	})
}