package httpclent

import (
	"errors"
	"sync"

	"github.com/tidwall/gjson"
)

// 如果不符合则返回异常
type ValidatorResponseBodyFunc func(body []byte) (err error)

var (
	defaultValidatorResponseBodyChain = []ValidatorResponseBodyFunc{validatorErrorMessage, validatorCodeDataMessage}
	// 通过key去过滤 func
	validatorResponseBodyChainFilterMap = map[string]ValidatorResponseBodyFunc{
		"error.message":     validatorErrorMessage,
		"code.data.message": validatorCodeDataMessage,
	}
	validatorLock sync.RWMutex
)

func CheckResponseBodyHasError(body []byte) error {
	validatorLock.RLock()
	defer validatorLock.RUnlock()
	for _, elem := range defaultValidatorResponseBodyChain {
		if err := elem(body); err != nil {
			return err
		}
	}
	return nil
}

/**
这个最好Main方法中调用一次
*/
func AddValidatorResponseBody(key string, fun ValidatorResponseBodyFunc) {
	if key == "" || fun == nil {
		return
	}
	validatorLock.Lock()
	defer validatorLock.Unlock()
	_, isExist := validatorResponseBodyChainFilterMap[key]
	if isExist {
		return
	}
	validatorResponseBodyChainFilterMap[key] = fun
	defaultValidatorResponseBodyChain = append(defaultValidatorResponseBodyChain, fun)
}

var (
	/**
	抓取这种格式的error.message
	{
	    "error": {
	        "message": ""
	    }
	}
	*/
	validatorErrorMessage ValidatorResponseBodyFunc = func(body []byte) (err error) {
		state := gjson.GetBytes(body, "error.message")
		if state.Exists() {
			return errors.New(state.String())
		}
		return nil
	}

	/**
	// code 不为0抓取message
	{
	    "code": -1,
	    "data": null,
	    "message": "请求参数异常"
	}
	*/
	validatorCodeDataMessage ValidatorResponseBodyFunc = func(body []byte) (err error) {
		code := gjson.GetBytes(body, "code")
		if code.Exists() && code.Int() != 0 {
			msg := gjson.GetBytes(body, "message")
			if msg.Exists() {
				return errors.New(msg.String())
			}
		}
		return nil
	}
)