package main

import (
	"context"
	"fmt"
	"net/http"

	"github.com/getkin/kin-openapi/openapi3"
	"github.com/getkin/kin-openapi/openapi3filter"
	"github.com/getkin/kin-openapi/routers/gorillamux"
)

func main() {
	ctx := context.Background()
	loader := &openapi3.Loader{Context: ctx, IsExternalRefsAllowed: true}
	schema :=
		`
openapi: 3.0.0
info:
 version: 1.0.0
 title: Sample API
paths:
 /items:
  get:
   parameters:
    - description: "test object"
      explode: false
      in: query
      name: test
      required: false
      style: form
      schema:
        allOf:
         - pattern: "^[0-9]{1,4}$"
         - pattern: "^[0-9]{1,4}$"
        type: string           
   responses:
    '200':
     description: Successful response`

	doc, err := loader.LoadFromData([]byte(schema))

	if err != nil {
		fmt.Println("failed to load schema. " + err.Error())
		return
	}
	// Validate document

	if err = doc.Validate(ctx); err != nil {
		fmt.Println("failed to validate schema. " + err.Error())
		return
	}

	router, _ := gorillamux.NewRouter(doc)
	httpReq, _ := http.NewRequest(http.MethodGet, "/items?test=51", nil)

	// Find route
	route, pathParams, _ := router.FindRoute(httpReq)

	// Validate request
	requestValidationInput := &openapi3filter.RequestValidationInput{
		Request:    httpReq,
		PathParams: pathParams,
		Route:      route,
	}
	err = openapi3filter.ValidateRequest(ctx, requestValidationInput)
	if err != nil {
		fmt.Println("failed to validate request. " + err.Error())
		return
	}

}