package com.example.processor;

import com.example.model.User;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.camel.Exchange;
import org.apache.camel.Configuration;
import org.apache.camel.BindToRegistry;
import org.apache.camel.Processor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Configuration
@BindToRegistry("userProcessor")
public class UserProcessor implements Processor {
    private static final Logger LOG = LoggerFactory.getLogger(UserProcessor.class);
    private static final ObjectMapper objectMapper = new ObjectMapper();

    @Override
    public void process(Exchange exchange) throws Exception {
        String operation = exchange.getIn().getHeader("operation", String.class);
        LOG.info("处理用户操作: {}", operation);

        switch (operation) {
            case "transformUserInput":
                transformUserInput(exchange);
                break;
            case "prepareUserResponse":
                prepareUserResponse(exchange);
                break;
            case "prepareUsersResponse":
                prepareUsersResponse(exchange);
                break;
            case "preparePagedUsersResponse":
                preparePagedUsersResponse(exchange);
                break;
            case "preparePageParams":
                preparePageParams(exchange);
                break;
            case "prepareAdvancedSearchParams":
                prepareAdvancedSearchParams(exchange);
                break;
            case "prepareErrorResponse":
                prepareErrorResponse(exchange);
                break;
            case "prepareCreateUserParams":
                prepareCreateUserParams(exchange);
                break;
            case "prepareUpdateUserParams":
                prepareUpdateUserParams(exchange);
                break;
            default:
                LOG.warn("未知操作: {}", operation);
                exchange.getIn().setBody("未知操作");
                exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 400);
        }
    }

    private void transformUserInput(Exchange exchange) throws Exception {
        String body = exchange.getIn().getBody(String.class);
        User user = objectMapper.readValue(body, User.class);
        exchange.getIn().setBody(user);
    }

    private void prepareUserResponse(Exchange exchange) throws Exception {
        List<Map<String, Object>> resultList = exchange.getIn().getBody(List.class);
        
        if (resultList == null || resultList.isEmpty()) {
            exchange.getIn().setBody("{\"message\": \"用户不存在\"}");
            exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 404);
            return;
        }
        
        Map<String, Object> result = resultList.get(0);
        User user = mapToUser(result);
        exchange.getIn().setBody(user);
    }

    private void prepareUsersResponse(Exchange exchange) throws Exception {
        List<Map<String, Object>> resultList = exchange.getIn().getBody(List.class);
        
        if (resultList == null) {
            resultList = new ArrayList<>();
        }
        
        List<User> users = new ArrayList<>();
        for (Map<String, Object> result : resultList) {
            users.add(mapToUser(result));
        }
        LOG.info("进入处理数据过程方法获取到的list: {}", users);
        exchange.getIn().setBody(users);
    }
    
    private void preparePagedUsersResponse(Exchange exchange) throws Exception {
        // 获取用户数据
        List<Map<String, Object>> resultList = exchange.getIn().getBody(List.class);
        
        if (resultList == null) {
            resultList = new ArrayList<>();
        }
        
        // 转换用户对象
        List<User> users = new ArrayList<>();
        for (Map<String, Object> result : resultList) {
            users.add(mapToUser(result));
        }
        
        // 获取总记录数
        Long total = exchange.getProperty("totalCount", Long.class);
        if (total == null) {
            total = 0L;
        }
        
        // 获取分页参数
        int page = exchange.getIn().getHeader("page", Integer.class);
        int size = exchange.getIn().getHeader("size", Integer.class);
        
        // 构建分页响应对象
        Map<String, Object> response = new HashMap<>();
        response.put("content", users);
        response.put("totalElements", total);
        response.put("totalPages", (int) Math.ceil((double) total / size));
        response.put("page", page);
        response.put("size", size);
        response.put("numberOfElements", users.size());
        
        exchange.getIn().setBody(response);
    }
    
    private void preparePageParams(Exchange exchange) {
        // 获取页码和每页大小参数，默认值为第1页，每页10条记录
        String pageParam = exchange.getIn().getHeader("page", "1", String.class);
        String sizeParam = exchange.getIn().getHeader("size", "10", String.class);
        
        int page = Integer.parseInt(pageParam);
        int size = Integer.parseInt(sizeParam);
        
        // 确保页码和每页大小有效
        page = Math.max(1, page);
        size = Math.max(1, Math.min(100, size)); // 限制每页最多100条记录
        
        // 计算偏移量
        int offset = (page - 1) * size;
        
        // 将参数设置到消息头中
        exchange.getIn().setHeader("page", page);
        exchange.getIn().setHeader("size", size);
        exchange.getIn().setHeader("offset", offset);
        exchange.getIn().setHeader("limit", size);
        
        // 创建参数Map用于SQL查询
        Map<String, Object> params = new HashMap<>();
        params.put("limit", size);
        params.put("offset", offset);
        
        exchange.getIn().setBody(params);
        LOG.info("分页参数: page={}, size={}, offset={}", page, size, offset);
    }
    
    private void prepareAdvancedSearchParams(Exchange exchange) {
        // 获取分页参数
        String pageParam = exchange.getIn().getHeader("page", "1", String.class);
        String sizeParam = exchange.getIn().getHeader("size", "10", String.class);
        
        int page = Integer.parseInt(pageParam);
        int size = Integer.parseInt(sizeParam);
        
        // 确保页码和每页大小有效
        page = Math.max(1, page);
        size = Math.max(1, Math.min(100, size)); // 限制每页最多100条记录
        
        // 计算偏移量
        int offset = (page - 1) * size;
        
        // 获取查询参数
        String username = exchange.getIn().getHeader("username", "", String.class);
        String email = exchange.getIn().getHeader("email", "", String.class);
        String phone = exchange.getIn().getHeader("phone", "", String.class);
        String activeStr = exchange.getIn().getHeader("active", "", String.class);
        String fromDate = exchange.getIn().getHeader("fromDate", "", String.class);
        String toDate = exchange.getIn().getHeader("toDate", "", String.class);
        
        // 获取排序参数
        String sortField = exchange.getIn().getHeader("sortField", "", String.class);
        String sortOrder = exchange.getIn().getHeader("sortOrder", "DESC", String.class);
        
        // 验证排序字段
        if (!sortField.isEmpty() && !isValidSortField(sortField)) {
            sortField = ""; // 无效的排序字段，使用默认排序字段(id)
        }
        
        // 验证排序顺序
        if (!sortOrder.equals("ASC") && !sortOrder.equals("DESC")) {
            sortOrder = "DESC"; // 无效的排序顺序，使用默认排序顺序
        }
        
        // 解析布尔值
        Boolean active = null;
        if (!activeStr.isEmpty()) {
            active = Boolean.parseBoolean(activeStr);
        }
        
        // 将参数设置到消息头中
        exchange.getIn().setHeader("page", page);
        exchange.getIn().setHeader("size", size);
        exchange.getIn().setHeader("offset", offset);
        exchange.getIn().setHeader("limit", size);
        exchange.getIn().setHeader("active", active);
        exchange.getIn().setHeader("sortField", sortField);
        exchange.getIn().setHeader("sortOrder", sortOrder);
        
        // 创建参数Map用于SQL查询
        Map<String, Object> params = new HashMap<>();
        params.put("username", username);
        params.put("email", email);
        params.put("phone", phone);
        params.put("active", active);
        params.put("fromDate", fromDate);
        params.put("toDate", toDate);
        params.put("sortField", sortField);
        params.put("sortOrder", sortOrder);
        params.put("limit", size);
        params.put("offset", offset);
        
        exchange.getIn().setBody(params);
        LOG.info("高级查询参数: page={}, size={}, username={}, email={}, active={}, sortField={}, sortOrder={}", 
                page, size, username, email, active, sortField, sortOrder);
    }
    
    private boolean isValidSortField(String field) {
        return field.equals("username") || field.equals("email") || field.equals("createTime");
    }

    private void prepareErrorResponse(Exchange exchange) {
        Exception exception = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
        String errorMessage = exception != null ? exception.getMessage() : "未知错误";
        
        Map<String, Object> errorResponse = new HashMap<>();
        errorResponse.put("error", true);
        errorResponse.put("message", errorMessage);
        
        exchange.getIn().setBody(errorResponse);
        exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 500);
    }

    private void prepareCreateUserParams(Exchange exchange) {
        User user = exchange.getIn().getBody(User.class);
        
        Map<String, Object> params = new HashMap<>();
        params.put("username", user.getUsername());
        params.put("email", user.getEmail());
        params.put("password", user.getPassword());
        params.put("fullName", user.getFullName());
        params.put("phone", user.getPhone());
        params.put("active", user.isActive());

        exchange.getIn().setHeader("username", user.getUsername());
        exchange.getIn().setHeader("email", user.getEmail());
        exchange.getIn().setHeader("password", user.getPassword());
        exchange.getIn().setHeader("fullName", user.getFullName());
        exchange.getIn().setHeader("phone", user.getPhone());
        exchange.getIn().setHeader("active", user.isActive());
        
        exchange.getIn().setBody(params);
    }

    private void prepareUpdateUserParams(Exchange exchange) {
        User user = exchange.getIn().getBody(User.class);
        String userId = exchange.getIn().getHeader("userId", String.class);
        
        Map<String, Object> params = new HashMap<>();
        params.put("id", Long.parseLong(userId));
        params.put("username", user.getUsername());
        params.put("email", user.getEmail());
        params.put("password", user.getPassword());
        params.put("fullName", user.getFullName());
        params.put("phone", user.getPhone());
        params.put("active", user.isActive());

        exchange.getIn().setHeader("id", Long.parseLong(userId));
        exchange.getIn().setHeader("username", user.getUsername());
        exchange.getIn().setHeader("email", user.getEmail());
        exchange.getIn().setHeader("password", user.getPassword());
        exchange.getIn().setHeader("fullName", user.getFullName());
        exchange.getIn().setHeader("phone", user.getPhone());
        exchange.getIn().setHeader("active", user.isActive());
        
        exchange.getIn().setBody(params);
    }

    private User mapToUser(Map<String, Object> result) {
        User user = new User();
        user.setId(((Number) result.get("id")).longValue());
        user.setUsername((String) result.get("username"));
        user.setEmail((String) result.get("email"));
        user.setPassword(null); // 出于安全考虑，不返回密码
        user.setFullName((String) result.get("full_name"));
        user.setPhone((String) result.get("phone"));
        user.setCreateTime((java.sql.Timestamp) result.get("create_time"));
        user.setUpdateTime((java.sql.Timestamp) result.get("update_time"));
        user.setActive((Boolean) result.get("active"));
        
        return user;
    }
}