//
//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

package dao

import (
	"ragflow/internal/entity"

	"gorm.io/gorm"
)

// TenantModelDAO tenant model data access object
type TenantModelDAO struct{}

// NewTenantModelDAO create tenant model DAO
func NewTenantModelDAO() *TenantModelDAO {
	return &TenantModelDAO{}
}

func (dao *TenantModelDAO) Create(instance *entity.TenantModel) error {
	return DB.Create(instance).Error
}

func (dao *TenantModelDAO) CreateBatch(models []*entity.TenantModel) error {
	if len(models) == 0 {
		return nil
	}

	return DB.Transaction(func(tx *gorm.DB) error {
		for _, model := range models {
			if err := tx.Create(model).Error; err != nil {
				return err
			}
		}
		return nil
	})
}

func (dao *TenantModelDAO) DeleteByModelID(modelID string) (int64, error) {
	result := DB.Unscoped().Where("id = ?", modelID).Delete(&entity.TenantModel{})
	return result.RowsAffected, result.Error
}

func (dao *TenantModelDAO) DeleteByModelIDAndProviderIDAndInstanceID(modelID, providerID, instanceID string) (int64, error) {
	result := DB.Unscoped().Where("id = ? AND provider_id = ? AND instance_id = ?", modelID, providerID, instanceID).Delete(&entity.TenantModel{})
	return result.RowsAffected, result.Error
}

func (dao *TenantModelDAO) DeleteByProviderIDAndInstanceID(provideID, instanceID string) (int64, error) {
	result := DB.Unscoped().Where("provider_id = ? AND instance_id = ?", provideID, instanceID).Delete(&entity.TenantModel{})
	return result.RowsAffected, result.Error
}

func (dao *TenantModelDAO) DeleteByProviderIDAndInstanceIDAndModelName(provideID, instanceID, modelName string) (int64, error) {
	result := DB.Unscoped().Where("provider_id = ? AND instance_id = ? AND model_name = ?", provideID, instanceID, modelName).Delete(&entity.TenantModel{})
	return result.RowsAffected, result.Error
}

func (dao *TenantModelDAO) UpdateStatusByIDAndScope(modelID, providerID, instanceID, status string) (int64, error) {
	result := DB.Model(&entity.TenantModel{}).Where("id = ? AND provider_id = ? AND instance_id = ?", modelID, providerID, instanceID).Update("status", status)
	return result.RowsAffected, result.Error
}

// GetByID get tenant model by primary key (id)
func (dao *TenantModelDAO) GetByID(id string) (*entity.TenantModel, error) {
	var model entity.TenantModel
	err := DB.Where("id = ?", id).First(&model).Error
	if err != nil {
		return nil, err
	}
	return &model, nil
}

func (dao *TenantModelDAO) GetModelByProviderIDAndInstanceIDAndModelName(providerID, instanceID, modelName string) (*entity.TenantModel, error) {
	var model entity.TenantModel
	err := DB.Where("provider_id = ? AND instance_id = ? AND model_name = ?", providerID, instanceID, modelName).First(&model).Error
	if err != nil {
		return nil, err
	}
	return &model, nil
}

func (dao *TenantModelDAO) GetModelsByProviderIDAndInstanceIDAndModelName(providerID, instanceID, modelName string) ([]*entity.TenantModel, error) {
	var models []*entity.TenantModel
	err := DB.Where("provider_id = ? AND instance_id = ? AND model_name = ?", providerID, instanceID, modelName).Find(&models).Error
	if err != nil {
		return nil, err
	}
	return models, nil
}

func (dao *TenantModelDAO) GetByProviderIDAndInstanceIDAndModelTypeAndModelName(providerID, instanceID string, modelType int, modelName string) (*entity.TenantModel, error) {
	var model entity.TenantModel
	// Use bitwise AND to match Python's bin_and(model_type) > 0 pattern.
	// A model_type value of 0 (unknown type) matches no row.
	err := DB.Where("provider_id = ? AND instance_id = ? AND model_type & ? > 0 AND model_name = ?", providerID, instanceID, modelType, modelName).First(&model).Error
	if err != nil {
		return nil, err
	}
	return &model, nil
}

// GetModelsByInstanceID get all models by instance ID
func (dao *TenantModelDAO) GetModelsByInstanceID(instanceID string) ([]*entity.TenantModel, error) {
	var models []*entity.TenantModel
	err := DB.Where("instance_id = ?", instanceID).Find(&models).Error
	if err != nil {
		return nil, err
	}
	return models, nil
}

// DeleteByIDs deletes all models whose id is in the given list.
// Mirrors Python's TenantModelService.delete_by_ids.
func (dao *TenantModelDAO) DeleteByIDs(ids []string) (int64, error) {
	if len(ids) == 0 {
		return 0, nil
	}
	result := DB.Unscoped().Where("id IN ?", ids).Delete(&entity.TenantModel{})
	return result.RowsAffected, result.Error
}

// UpdateByID updates a tenant model's model_type and extra by primary key.
// Mirrors Python's TenantModelService.update_model.
func (dao *TenantModelDAO) UpdateByID(id string, updates map[string]interface{}) error {
	return DB.Model(&entity.TenantModel{}).Where("id = ?", id).Updates(updates).Error
}

// DeleteByInstanceIDs deletes all models whose instance_id is in the given list.
func (dao *TenantModelDAO) DeleteByInstanceIDs(instanceIDs []string) (int64, error) {
	if len(instanceIDs) == 0 {
		return 0, nil
	}
	result := DB.Unscoped().Where("instance_id IN ?", instanceIDs).Delete(&entity.TenantModel{})
	return result.RowsAffected, result.Error
}

// GetModelsByProviderIDsAndInstanceIDs returns TenantModel rows whose
// provider_id is in providerIDs and instance_id is in instanceIDs.
// Mirrors Python's
// TenantModelService.get_models_by_provider_ids_and_instance_ids and is
// used to fetch per-tenant enable/disable overrides in bulk during
// /api/v1/models response assembly. The Go port never WRITES to
// tenant_model, so callers must treat an empty result as "use factory
// defaults" — see ModelProviderService.ListTenantAddedModels.
func (dao *TenantModelDAO) GetModelsByProviderIDsAndInstanceIDs(providerIDs, instanceIDs []string) ([]*entity.TenantModel, error) {
	models := make([]*entity.TenantModel, 0)
	if len(providerIDs) == 0 || len(instanceIDs) == 0 {
		return models, nil
	}
	err := DB.Where("provider_id IN ? AND instance_id IN ?", providerIDs, instanceIDs).Find(&models).Error
	if err != nil {
		return nil, err
	}
	return models, nil
}