package repository

import (
	"errors"

	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
	"gorm.io/gorm"
)

// PigBatchRepository 定义了与猪批次相关的数据库操作接口
type PigBatchRepository interface {
	CreatePigBatch(batch *models.PigBatch) (*models.PigBatch, error)
	GetPigBatchByID(id uint) (*models.PigBatch, error)
	UpdatePigBatch(batch *models.PigBatch) (*models.PigBatch, error)
	DeletePigBatch(id uint) error
	ListPigBatches(isActive *bool) ([]*models.PigBatch, error)
}

// gormPigBatchRepository 是 PigBatchRepository 的 GORM 实现
type gormPigBatchRepository struct {
	db *gorm.DB
}

// NewGormPigBatchRepository 创建一个新的 PigBatchRepository GORM 实现实例
func NewGormPigBatchRepository(db *gorm.DB) PigBatchRepository {
	return &gormPigBatchRepository{db: db}
}

// CreatePigBatch 创建一个新的猪批次
func (r *gormPigBatchRepository) CreatePigBatch(batch *models.PigBatch) (*models.PigBatch, error) {
	if err := r.db.Create(batch).Error; err != nil {
		return nil, err
	}
	return batch, nil
}

// GetPigBatchByID 根据ID获取单个猪批次
func (r *gormPigBatchRepository) GetPigBatchByID(id uint) (*models.PigBatch, error) {
	var batch models.PigBatch
	if err := r.db.First(&batch, id).Error; err != nil {
		return nil, err
	}
	return &batch, nil
}

// UpdatePigBatch 更新一个猪批次
func (r *gormPigBatchRepository) UpdatePigBatch(batch *models.PigBatch) (*models.PigBatch, error) {
	result := r.db.Model(&models.PigBatch{}).Where("id = ?", batch.ID).Updates(batch)
	if result.Error != nil {
		return nil, result.Error
	}
	if result.RowsAffected == 0 {
		return nil, errors.New("未找到要更新的猪批次或数据未改变") // 明确返回错误，而不是 gorm.ErrRecordNotFound
	}
	return batch, nil
}

// DeletePigBatch 根据ID删除一个猪批次 (GORM 会执行软删除)
func (r *gormPigBatchRepository) DeletePigBatch(id uint) error {
	result := r.db.Delete(&models.PigBatch{}, id)
	if result.Error != nil {
		return result.Error
	}
	if result.RowsAffected == 0 {
		return errors.New("未找到要删除的猪批次") // 明确返回错误
	}
	return nil
}

// ListPigBatches 批量查询猪批次，支持根据 IsActive 筛选
func (r *gormPigBatchRepository) ListPigBatches(isActive *bool) ([]*models.PigBatch, error) {
	var batches []*models.PigBatch
	query := r.db.Model(&models.PigBatch{})

	if isActive != nil {
		if *isActive {
			// 查询活跃的批次：状态不是已出售或已归档
			query = query.Where("status NOT IN (?) ", []models.PigBatchStatus{models.BatchStatusSold, models.BatchStatusArchived})
		} else {
			// 查询非活跃的批次：状态是已出售或已归档
			query = query.Where("status IN (?) ", []models.PigBatchStatus{models.BatchStatusSold, models.BatchStatusArchived})
		}
	}

	if err := query.Find(&batches).Error; err != nil {
		return nil, err
	}
	return batches, nil
}