// Copyright 2017 Amazon.com, Inc. or its affiliates. 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. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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.

// Package websocketutil contains methods for interacting with websocket connections.
package websocketutil

import (
	"fmt"
	"net/http"
	"net/http/httptest"
	"net/url"
	"testing"

	"github.com/aws/amazon-ssm-agent/agent/appconfig"
	"github.com/aws/amazon-ssm-agent/agent/mocks/log"
	"github.com/aws/amazon-ssm-agent/agent/network"
	mgsConfig "github.com/aws/amazon-ssm-agent/agent/session/config"
	"github.com/gorilla/websocket"
	"github.com/stretchr/testify/assert"
)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
}

var dialerInput = &websocket.Dialer{
	TLSClientConfig: network.GetDefaultTLSConfig(log.NewMockLog(), appconfig.DefaultConfig()),
	Proxy:           http.ProxyFromEnvironment,
	WriteBufferSize: mgsConfig.ControlChannelWriteBufferSizeLimit,
}

func handlerToBeTested(w http.ResponseWriter, req *http.Request) {
	conn, err := upgrader.Upgrade(w, req, nil)
	if err != nil {
		http.Error(w, fmt.Sprintf("cannot upgrade: %v", err), http.StatusInternalServerError)
	}
	mt, p, err := conn.ReadMessage()

	if err != nil {
		return
	}
	conn.WriteMessage(mt, []byte("hello "+string(p)))
}

func TestWebsocketUtilOpenCloseConnection(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(handlerToBeTested))
	u, _ := url.Parse(srv.URL)
	u.Scheme = "ws"
	var log = log.NewMockLog()
	appConfig := appconfig.SsmagentConfig{}
	var ws = NewWebsocketUtil(log, appConfig, nil)
	conn, _ := ws.OpenConnection(u.String(), http.Header{})
	assert.NotNil(t, conn, "Open connection failed.")

	err := ws.CloseConnection(conn)
	assert.Nil(t, err, "Error closing the websocket connection.")
}

func TestWebsocketUtilOpenCloseConnectionWithWriteBuffer(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(handlerToBeTested))
	u, _ := url.Parse(srv.URL)
	u.Scheme = "ws"
	var log = log.NewMockLog()
	appConfig := appconfig.SsmagentConfig{}
	var ws = NewWebsocketUtil(log, appConfig, dialerInput)
	conn, _ := ws.OpenConnection(u.String(), http.Header{})
	assert.NotNil(t, conn, "Open connection failed.")

	err := ws.CloseConnection(conn)
	assert.Nil(t, err, "Error closing the websocket connection.")
}

func TestWebsocketUtilOpenConnectionInvalidUrl(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(handlerToBeTested))
	u, _ := url.Parse(srv.URL)
	u.Scheme = "ws"
	var log = log.NewMockLog()

	appConfig := appconfig.SsmagentConfig{}
	var ws = NewWebsocketUtil(log, appConfig, nil)
	conn, _ := ws.OpenConnection("InvalidUrl", http.Header{})
	assert.Nil(t, conn, "Open connection failed.")
}

func TestSendMessage(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(handlerToBeTested))
	u, _ := url.Parse(srv.URL)
	u.Scheme = "ws"
	var log = log.NewMockLog()

	appConfig := appconfig.SsmagentConfig{}
	var ws = NewWebsocketUtil(log, appConfig, nil)
	conn, _ := ws.OpenConnection(u.String(), http.Header{})
	assert.NotNil(t, conn, "Open connection failed.")
	err := conn.WriteMessage(websocket.TextMessage, []byte("testing testing"))
	assert.Nil(t, err)
}

func TestSendMessageWithWriteBuffer(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(handlerToBeTested))
	u, _ := url.Parse(srv.URL)
	u.Scheme = "ws"
	var log = log.NewMockLog()

	appConfig := appconfig.SsmagentConfig{}
	var ws = NewWebsocketUtil(log, appConfig, dialerInput)
	conn, _ := ws.OpenConnection(u.String(), http.Header{})
	assert.NotNil(t, conn, "Open connection failed.")
	err := conn.WriteMessage(websocket.TextMessage, []byte("testing testing"))
	assert.Nil(t, err)
}
