// Copyright © 2023 OpenIM open source community. 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 chat

import (
	"context"
	"strings"

	chatdb "git.imall.cloud/openim/chat/pkg/common/db/table/chat"
	"git.imall.cloud/openim/chat/pkg/common/mctx"
	"git.imall.cloud/openim/chat/pkg/protocol/chat"
)

// ==================== 敏感词检测相关 RPC ====================

// GetSensitiveWords 获取敏感词列表
func (o *chatSvr) GetSensitiveWords(ctx context.Context, req *chat.GetSensitiveWordsReq) (*chat.GetSensitiveWordsResp, error) {
	// 验证用户身份
	if _, _, err := mctx.Check(ctx); err != nil {
		return nil, err
	}

	// 获取启用的敏感词列表
	words, err := o.Database.GetSensitiveWords(ctx)
	if err != nil {
		return nil, err
	}

	// 转换为响应格式（客户端只需要基本信息）
	var wordInfos []*chat.SensitiveWordInfo
	for _, word := range words {
		wordInfos = append(wordInfos, &chat.SensitiveWordInfo{
			Word:        word.Word,
			Action:      word.Action,
			ReplaceChar: "", // 敏感词本身没有替换字符，使用配置中的默认值
		})
	}

	// 获取敏感词配置
	config, err := o.Database.GetSensitiveWordConfig(ctx)
	if err != nil {
		// 如果配置不存在，使用默认值
		config = &chatdb.SensitiveWordConfig{
			EnableFilter: true,
			ReplaceChar:  "***",
		}
	}

	return &chat.GetSensitiveWordsResp{
		Words:              wordInfos,
		EnableFilter:       config.EnableFilter,
		DefaultReplaceChar: config.ReplaceChar,
	}, nil
}

// CheckSensitiveWords 检测敏感词
func (o *chatSvr) CheckSensitiveWords(ctx context.Context, req *chat.CheckSensitiveWordsReq) (*chat.CheckSensitiveWordsResp, error) {
	// 验证用户身份
	if _, _, err := mctx.Check(ctx); err != nil {
		return nil, err
	}

	// 检测敏感词
	matchedWords, hasSensitive, err := o.Database.CheckSensitiveWords(ctx, req.Content)
	if err != nil {
		return nil, err
	}

	// 如果检测到敏感词，进行内容过滤
	filteredContent := req.Content
	var matchedWordStrings []string

	if hasSensitive {
		for _, word := range matchedWords {
			matchedWordStrings = append(matchedWordStrings, word.Word)

			// 根据处理动作进行替换
			if word.Action == 1 { // 替换模式
				// 获取配置中的替换字符
				config, err := o.Database.GetSensitiveWordConfig(ctx)
				replaceChar := "***"
				if err == nil && config.ReplaceChar != "" {
					replaceChar = config.ReplaceChar
				}
				filteredContent = strings.ReplaceAll(filteredContent, word.Word, replaceChar)
			}
		}
	}

	return &chat.CheckSensitiveWordsResp{
		HasSensitive:    hasSensitive,
		FilteredContent: filteredContent,
		MatchedWords:    matchedWordStrings,
	}, nil
}