/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 config

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/apache/answer/internal/entity"
)

// ConfigRepo config repository
type ConfigRepo interface {
	GetConfigByID(ctx context.Context, id int) (c *entity.Config, err error)
	GetConfigByKey(ctx context.Context, key string) (c *entity.Config, err error)
	GetConfigByKeyFromDB(ctx context.Context, key string) (c *entity.Config, err error)
	UpdateConfig(ctx context.Context, key, value string) (err error)
}

// ConfigService user service
type ConfigService struct {
	configRepo ConfigRepo
}

// NewConfigService new config service
func NewConfigService(configRepo ConfigRepo) *ConfigService {
	return &ConfigService{
		configRepo: configRepo,
	}
}

// GetIntValue get config int value
func (cs *ConfigService) GetIntValue(ctx context.Context, key string) (val int, err error) {
	cf, err := cs.configRepo.GetConfigByKey(ctx, key)
	if err != nil {
		return 0, err
	}
	return cf.GetIntValue(), nil
}

// GetStringValue get config string value
func (cs *ConfigService) GetStringValue(ctx context.Context, key string) (val string, err error) {
	cf, err := cs.configRepo.GetConfigByKey(ctx, key)
	if err != nil {
		return "", err
	}
	return cf.Value, nil
}

// GetStringValueFromDB gets config string value directly from DB, bypassing cache.
func (cs *ConfigService) GetStringValueFromDB(ctx context.Context, key string) (val string, err error) {
	cf, err := cs.configRepo.GetConfigByKeyFromDB(ctx, key)
	if err != nil {
		return "", err
	}
	return cf.Value, nil
}

// GetArrayStringValue get config array string value
func (cs *ConfigService) GetArrayStringValue(ctx context.Context, key string) (val []string, err error) {
	cf, err := cs.configRepo.GetConfigByKey(ctx, key)
	if err != nil {
		return nil, err
	}
	return cf.GetArrayStringValue(), nil
}

func (cs *ConfigService) GetJsonConfigByIDAndSetToObject(ctx context.Context, id int, obj any) (err error) {
	cf, err := cs.configRepo.GetConfigByID(ctx, id)
	if err != nil {
		return err
	}
	err = json.Unmarshal([]byte(cf.Value), obj)
	if err != nil {
		return fmt.Errorf("[%s] config value is not json format", cf.Key)
	}
	return nil
}

// GetConfigByID get config by id
func (cs *ConfigService) GetConfigByID(ctx context.Context, id int) (c *entity.Config, err error) {
	return cs.configRepo.GetConfigByID(ctx, id)
}

func (cs *ConfigService) GetConfigByKey(ctx context.Context, key string) (c *entity.Config, err error) {
	return cs.configRepo.GetConfigByKey(ctx, key)
}

// GetIDByKey get config id by key
func (cs *ConfigService) GetIDByKey(ctx context.Context, key string) (id int, err error) {
	cf, err := cs.configRepo.GetConfigByKey(ctx, key)
	if err != nil {
		return 0, err
	}
	return cf.ID, nil
}

func (cs *ConfigService) UpdateConfig(ctx context.Context, key, value string) (err error) {
	return cs.configRepo.UpdateConfig(ctx, key, value)
}