package handler

import (
	"git.icechen.cn/monorepo/backend/app/brahma/api/murder/internal/error_process"
	"git.icechen.cn/monorepo/backend/app/brahma/api/murder/internal/model"
	"github.com/gofiber/fiber/v2"
	"github.com/google/uuid"
	"github.com/pkg/errors"
	"github.com/spf13/cast"
	"reflect"
	"strings"
)

type pluginFunc func(interface{}) error

func checkParam(body interface{}, ctx *fiber.Ctx, plugins ...pluginFunc) error {
	//第一次执行解析body，并且调用插件方法
	if ctx != nil {
		err := ctx.BodyParser(body)
		if err != nil {
			return error_process.CommonErr(err)
		}
		for _, plugin := range plugins {
			if err = plugin(body); err != nil {
				return err
			}
		}
	}
	//step1 校验是否是指针
	typ := reflect.TypeOf(body)
	val := reflect.ValueOf(body)
	if val.Kind().String() != reflect.Ptr.String() {
		return errors.New(error_process.NoPointError)
	}
	if val.IsNil() {
		return errors.New(error_process.NilPointError)
	}
	num := val.Elem().NumField()
	for i := 0; i < num; i++ {
		kind := val.Elem().Field(i).Kind().String()
		switch kind {
		case reflect.Ptr.String():
			//显示指定某些指针跳过校验
			if tag := typ.Elem().Field(i).Tag.Get("valid"); tag == "omitempty" {
				continue
			}
			//递归调用
			if err := checkParam(val.Elem().Field(i).Interface(), nil); err != nil {
				return err
			}
		default:
			//非空值验证
			if tag := typ.Elem().Field(i).Tag.Get("valid"); tag == "no_empty" {
				switch kind {
				case reflect.Ptr.String():
					if val.Elem().Field(i).IsNil() == true {
						return error_process.EmptyValueErr(typ.Elem().Field(i).Tag.Get("json"))
					}
				case reflect.Slice.String():
					if val.Elem().Field(i).IsNil() == true || val.Elem().Field(i).Len() == 0 {
						return error_process.EmptyValueErr(typ.Elem().Field(i).Tag.Get("json"))
					}
				default:
					if val.Elem().Field(i).IsZero() {
						return error_process.EmptyValueErr(typ.Elem().Field(i).Tag.Get("json"))
					}
				}
			}
		}
		//指定制验证
		if values := typ.Elem().Field(i).Tag.Get("value"); values != "" {
			eles := make([]string, 0)
			if eles = strings.Split(values, "|"); len(eles) == 0 {
				continue
			}
			switch kind {
			case reflect.Int.String():
				for _, v := range eles {
					if b := val.Elem().Field(i).Int(); b == cast.ToInt64(v) {
						//匹配到值定制跳出此次tag处理方法
						goto LOOP
					}
				}
				return errors.New(error_process.IllegalValueError)
			default:
				return errors.New(error_process.BodyParserErr)
			}
		}
	LOOP:
	}
	return nil
}

//tag uuid 覆盖写
func tagUuidPlugin(body interface{}) error {
	if req, ok := body.(*TagReq); ok {
		if req.Tag == nil {
			return errors.New(error_process.BodyParserErr)
		}
		//if req.Tag.Uuid == "" {
		//	req.Tag.Uuid = xid.New().String()
		//}
		return nil
	}
	return errors.New(error_process.BodyParserErr)
}

//category uuid 覆盖写
func categoryUuidPlugin(body interface{}) error {
	if req, ok := body.(*CategoryReq); ok {
		if req.Category == nil {
			return errors.New(error_process.BodyParserErr)
		}
		if req.Category.Uuid == "" {
			req.Category.Uuid = uuid.New().String()
		}
		return nil
	}
	return errors.New(error_process.BodyParserErr)
}

//script uuid 覆盖写
func scriptUuidPlugin(body interface{}) error {
	if req, ok := body.(*model.Scripts); ok {
		if req == nil {
			return errors.New(error_process.BodyParserErr)
		}
		if req.Uuid == "" {
			req.Uuid = uuid.New().String()
		}
		return nil
	}
	return errors.New(error_process.BodyParserErr)
}

func createTagParamCheck(body interface{}, ctx *fiber.Ctx) error {
	return checkParam(body, ctx, tagUuidPlugin)
}

func createCategoryParamCheck(body interface{}, ctx *fiber.Ctx) error {
	return checkParam(body, ctx, categoryUuidPlugin)
}

func createScriptParamCheck(body interface{}, ctx *fiber.Ctx) error {
	return checkParam(body, ctx, scriptUuidPlugin)
}