// Package request ...
//
// Description : request ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022-07-03 00:33
package request

import (
	"bytes"
	"errors"
	"io/ioutil"
	"net/http"
	"strings"

	"github.com/go-playground/validator/v10"

	"git.zhangdeman.cn/zhangdeman/gin/define"

	"github.com/gin-gonic/gin"
)

// form 表单相关操作
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 00:51 2022/7/3
type form struct {
	checkInstance *validator.Validate
}

// Parse 解析请求表单
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 00:34 2022/7/3
func (f *form) Parse(ctx *gin.Context, receiver interface{}) error {
	var validateFunc = func(parseErr error) error {
		if nil != parseErr {
			return parseErr
		}
		receiverIsStruct := false
		switch receiver.(type) {
		case struct{}:
			receiverIsStruct = true
		}
		if !receiverIsStruct {
			// 不是结构体，不验证表单
			return nil
		}
		return f.checkInstance.Struct(receiver)
	}

	requestBody, _ := ioutil.ReadAll(ctx.Request.Body)
	// 请求信息写入上下文
	ctx.Set(define.RecordRequestDataField, string(requestBody))
	// 因为请求体被读一遍之后就没了，重新赋值 requestBody
	ctx.Request.Body = ioutil.NopCloser(bytes.NewReader(requestBody))
	method := strings.ToUpper(ctx.Request.Method)
	if method == http.MethodGet ||
		method == http.MethodPatch ||
		method == http.MethodTrace ||
		method == http.MethodConnect ||
		method == http.MethodOptions {
		return validateFunc(ctx.ShouldBindQuery(receiver))
	}

	if method == http.MethodPost ||
		method == http.MethodPut ||
		method == http.MethodDelete {
		if ContentType.IsJson(ctx) {
			return validateFunc(ctx.ShouldBindJSON(receiver))
		}

		if ContentType.IsFormURLEncoded(ctx) {
			return validateFunc(ctx.ShouldBind(receiver))
		}

		return errors.New(ctx.ContentType() + " is not support")
	}
	return errors.New(method + " : request method is not support")
}