package com.zy.acs.manager.common.interceptor;

import com.alibaba.fastjson.JSON;
import com.zy.acs.framework.common.Cools;
import com.zy.acs.framework.common.R;
import com.zy.acs.framework.common.SnowflakeIdWorker;
import com.zy.acs.manager.common.interceptor.IntegrationOpenApiInterceptor.IntegrationRequestContext;
import com.zy.acs.manager.common.utils.IpTools;
import com.zy.acs.manager.manager.entity.IntegrationRecord;
import com.zy.acs.manager.manager.enums.IntegrationDirectionType;
import com.zy.acs.manager.manager.enums.StatusType;
import com.zy.acs.manager.manager.service.IntegrationRecordService;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.jetbrains.annotations.NotNull;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.Date;
import java.util.UUID;

@Slf4j
@ControllerAdvice
public class IntegrationRecordAdvice implements ResponseBodyAdvice<Object> {

    private static final String HEADER_APP_KEY = "appkey";
    private static final String HEADER_CALLER = "caller";

    @Autowired
    private IntegrationRecordService integrationRecordService;
    @Resource
    private SnowflakeIdWorker snowflakeIdWorker;

    @Override
    public boolean supports(@NotNull MethodParameter methodParameter,
                            @NotNull Class<? extends HttpMessageConverter<?>> aClass) {
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object body,
                                  @NotNull MethodParameter methodParameter,
                                  @NotNull MediaType mediaType,
                                  @NotNull Class<? extends HttpMessageConverter<?>> aClass,
                                  @NotNull ServerHttpRequest serverHttpRequest,
                                  @NotNull ServerHttpResponse serverHttpResponse) {
        if (!(serverHttpRequest instanceof ServletServerHttpRequest)) {
            return body;
        }
        HttpServletRequest request = ((ServletServerHttpRequest) serverHttpRequest).getServletRequest();
        IntegrationRequestContext context = IntegrationOpenApiInterceptor.getContext(request);
        if (context == null) {
            return body;
        }
        try {
            IntegrationRecord record = buildRecord(body, request, context);
            integrationRecordService.syncRecord(record);
        } catch (Exception e) {
            log.error("Failed to persist integration log for {}", context.getHandler(), e);
        }
        return body;
    }

    private IntegrationRecord buildRecord(Object responseBody,
                                          HttpServletRequest request,
                                          IntegrationRequestContext context) {
        Date now = new Date();
        ResultView resultView = resolveResult(responseBody);

        IntegrationRecord record = new IntegrationRecord();
        record.setUuid(nextUuid());
        record.setNamespace(context.getNamespace());
        record.setUrl(context.getUri());
        record.setAppkey(request.getHeader(HEADER_APP_KEY));
        record.setCaller(resolveCaller(request));
        record.setDirection(IntegrationDirectionType.INBOUND.value);
        record.setTimestamp(String.valueOf(context.getStartAt()));
        record.setClientIp(IpTools.gainRealIp(request));
        record.setRequest(safeToJson(context.getRequestSnapshot()));
        record.setResponse(safeToJson(responseBody));
        record.setErr(resultView.getError());
        record.setResult(resultView.getResult());
        record.setCostMs(cost(context.getStartAt()));
        record.setStatus(StatusType.ENABLE.val);
        record.setCreateTime(now);
        record.setUpdateTime(now);
        record.setMemo(context.getHandler());
        return record;
    }

    private ResultView resolveResult(Object body) {
        if (!(body instanceof R)) {
            return ResultView.unknown();
        }
        R response = (R) body;
        Integer code = parseInteger(response.get("code"));
        if (code == null) {
            return ResultView.unknown();
        }
        boolean success = code == 200;
        String error = success ? null : safeToString(response.get("msg"));
        return new ResultView(success ? 1 : 0, error);
    }

    private Integer parseInteger(Object codeObj) {
        if (codeObj == null) {
            return null;
        }
        if (codeObj instanceof Integer) {
            return (Integer) codeObj;
        }
        try {
            return Integer.parseInt(String.valueOf(codeObj));
        } catch (NumberFormatException e) {
            return null;
        }
    }

    private String safeToJson(Object value) {
        if (value == null) {
            return null;
        }
        try {
            return JSON.toJSONString(value);
        } catch (Exception e) {
            log.warn("Failed to serialize value for integration log: {}", value.getClass().getName(), e);
            return String.valueOf(value);
        }
    }

    private String resolveCaller(HttpServletRequest request) {
        String caller = request.getHeader(HEADER_CALLER);
        if (Cools.isEmpty(caller)) {
            caller = request.getHeader(HEADER_APP_KEY);
        }
        return caller;
    }

    private int cost(long startAt) {
        long duration = System.currentTimeMillis() - startAt;
        if (duration < 0) {
            return 0;
        }
        return (int) duration;
    }

    private String nextUuid() {
        if (snowflakeIdWorker != null) {
            return String.valueOf(snowflakeIdWorker.nextId()).substring(3);
        }
        return UUID.randomUUID().toString().replace("-", "");
    }

    private String safeToString(Object value) {
        return value == null ? null : String.valueOf(value);
    }

    @Getter
    @AllArgsConstructor
    private static class ResultView {
        private final Integer result;
        private final String error;

        private static ResultView unknown() {
            return new ResultView(null, null);
        }
    }
}