package model

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

func TestTask_ProcessForJSON(t *testing.T) {
	t.Run("task with HH:MM:SS reminder and all fields", func(t *testing.T) {
		task := &Task{
			DueDate:           sql.NullTime{Time: time.Date(2025, 3, 15, 0, 0, 0, 0, time.UTC), Valid: true},
			ReminderTime:      sql.NullString{String: "14:30:00", Valid: true},
			CompletedAt:       sql.NullTime{Time: time.Now(), Valid: true},
			RecurrenceType:    sql.NullString{String: "weekly", Valid: true},
			RecurrenceEndDate: sql.NullTime{Time: time.Date(2025, 12, 31, 0, 0, 0, 0, time.UTC), Valid: true},
			ParentTaskID:      sql.NullInt64{Int64: 5, Valid: true},
		}
		task.ProcessForJSON()

		if task.DueDateStr == nil || *task.DueDateStr != "2025-03-15" {
			t.Errorf("expected due_date 2025-03-15, got %v", task.DueDateStr)
		}
		if task.ReminderTimeStr == nil || *task.ReminderTimeStr != "14:30" {
			t.Errorf("expected reminder 14:30, got %v", task.ReminderTimeStr)
		}
		if !task.Completed {
			t.Error("expected completed to be true")
		}
		if task.RecurrenceTypeStr == nil || *task.RecurrenceTypeStr != "weekly" {
			t.Errorf("expected recurrence_type weekly, got %v", task.RecurrenceTypeStr)
		}
		if task.RecurrenceEndStr == nil || *task.RecurrenceEndStr != "2025-12-31" {
			t.Errorf("expected recurrence_end 2025-12-31, got %v", task.RecurrenceEndStr)
		}
		if task.ParentTaskIDPtr == nil || *task.ParentTaskIDPtr != 5 {
			t.Errorf("expected parent_task_id 5, got %v", task.ParentTaskIDPtr)
		}
	})

	t.Run("task with RFC3339 reminder", func(t *testing.T) {
		task := &Task{
			ReminderTime: sql.NullString{String: "0000-01-01T09:00:00Z", Valid: true},
		}
		task.ProcessForJSON()

		if task.ReminderTimeStr == nil || *task.ReminderTimeStr != "09:00" {
			t.Errorf("expected 09:00, got %v", task.ReminderTimeStr)
		}
	})

	t.Run("incomplete task with null fields", func(t *testing.T) {
		task := &Task{
			DueDate:     sql.NullTime{Valid: false},
			CompletedAt: sql.NullTime{Valid: false},
		}
		task.ProcessForJSON()

		if task.DueDateStr != nil {
			t.Error("expected due_date nil")
		}
		if task.Completed {
			t.Error("expected completed to be false")
		}
	})
}