package service

import (
	"time"

	"gorm.io/gorm"

	"github.com/sundynix/pets-be/internal/model"
)

// ListTasks 列出宠物任务（date 为空则取今天）
func (s *Service) ListTasks(userID, petID uint, date *time.Time) ([]model.DailyTask, error) {
	if _, err := s.ownedPet(userID, petID); err != nil {
		return nil, err
	}
	q := s.db.Where("pet_id = ?", petID)
	if date != nil {
		start := time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
		end := start.AddDate(0, 0, 1)
		q = q.Where("task_date >= ? AND task_date < ?", start, end)
	}
	var tasks []model.DailyTask
	err := q.Order("id asc").Find(&tasks).Error
	return tasks, err
}

// ToggleTask 切换任务完成状态
func (s *Service) ToggleTask(userID, taskID uint) (*model.DailyTask, error) {
	var task model.DailyTask
	if err := s.db.Where("id = ? AND user_id = ?", taskID, userID).First(&task).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, ErrNotFound
		}
		return nil, err
	}
	task.Done = !task.Done
	if task.Done {
		now := time.Now()
		task.CompletedAt = &now
	} else {
		task.CompletedAt = nil
	}
	if err := s.db.Save(&task).Error; err != nil {
		return nil, err
	}
	return &task, nil
}

// CompleteAllTasks 完成宠物今日全部任务
func (s *Service) CompleteAllTasks(userID, petID uint) ([]model.DailyTask, error) {
	if _, err := s.ownedPet(userID, petID); err != nil {
		return nil, err
	}
	now := time.Now()
	start := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
	end := start.AddDate(0, 0, 1)
	if err := s.db.Model(&model.DailyTask{}).
		Where("pet_id = ? AND task_date >= ? AND task_date < ?", petID, start, end).
		Updates(map[string]any{"done": true, "completed_at": now}).Error; err != nil {
		return nil, err
	}
	return s.ListTasks(userID, petID, &now)
}