// Copyright 2017 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// gnostic_lint is a tool for analyzing OpenAPI descriptions.
//
// It scans an API description and checks it against a set of
// coding style guidelines.
//
// Results are returned in a JSON structure.
package main

import (
	"github.com/golang/protobuf/proto"
	openapiv2 "github.com/googleapis/gnostic/openapiv2"
	openapiv3 "github.com/googleapis/gnostic/openapiv3"
	plugins "github.com/googleapis/gnostic/plugins"
)

type DocumentLinter interface {
	Run() []*plugins.Message
}

// This is the main function for the plugin.
func main() {
	env, err := plugins.NewEnvironment()
	env.RespondAndExitIfError(err)

	var linter DocumentLinter

	for _, model := range env.Request.Models {
		switch model.TypeUrl {
		case "openapi.v2.Document":
			documentv2 := &openapiv2.Document{}
			err = proto.Unmarshal(model.Value, documentv2)
			if err == nil {
				linter = NewDocumentLinterV2(documentv2)
				env.Response.Messages = linter.Run()
			}
		case "openapi.v3.Document":
			documentv3 := &openapiv3.Document{}
			err = proto.Unmarshal(model.Value, documentv3)
			if err == nil {
				linter = NewDocumentLinterV3(documentv3)
				env.Response.Messages = linter.Run()
			}
		}
	}

	env.RespondAndExit()
}