// <copyright file="TestWebServer.cs" company="Selenium Committers">
// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you 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.
// </copyright>

using Bazel;
using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;

namespace OpenQA.Selenium.Environment;

public class TestWebServer
{
    private Process webserverProcess;

    private string standaloneAppserverPath;
    private string projectRootPath;
    private bool captureWebServerOutput;
    private bool hideCommandPrompt;
    private string port;

    public TestWebServer(string projectRoot, TestWebServerConfig config)
    {
        this.projectRootPath = projectRoot;
        this.captureWebServerOutput = config.CaptureConsoleOutput;
        this.hideCommandPrompt = config.HideCommandPromptWindow;
        this.port = config.Port;
    }

    public async Task StartAsync()
    {
        if (webserverProcess == null || webserverProcess.HasExited)
        {
            try
            {
                var runfiles = Runfiles.Create();

                var standaloneAppserverProbingPath = @"_main/java/test/org/openqa/selenium/environment/appserver";

                if (OperatingSystem.IsWindows())
                {
                    standaloneAppserverProbingPath += ".exe";
                }

                standaloneAppserverPath = runfiles.Rlocation(standaloneAppserverProbingPath);
            }
            catch (FileNotFoundException)
            {
                // means we are NOT running under bazel runtime
                // most likely in IDE
            }

            var processFileName = standaloneAppserverPath ?? "bazel";

            string processArguments = $"{port}";

            if (standaloneAppserverPath is null)
            {
                processArguments = $"run //java/test/org/openqa/selenium/environment:appserver {processArguments}";

                // Override project root path to be exact selenium repo path, not 'bazel-bin'
                projectRootPath = Path.Combine(AppContext.BaseDirectory, "../../../../../..");
            }

            webserverProcess = new Process();

            webserverProcess.StartInfo.FileName = processFileName;
            webserverProcess.StartInfo.Arguments = processArguments;
            webserverProcess.StartInfo.WorkingDirectory = projectRootPath;
            webserverProcess.StartInfo.UseShellExecute = !(hideCommandPrompt || captureWebServerOutput);
            webserverProcess.StartInfo.CreateNoWindow = hideCommandPrompt;

            captureWebServerOutput = true;

            if (captureWebServerOutput)
            {
                webserverProcess.StartInfo.RedirectStandardOutput = true;
                webserverProcess.StartInfo.RedirectStandardError = true;
            }

            webserverProcess.Start();

            TimeSpan timeout = TimeSpan.FromSeconds(30);
            DateTime endTime = DateTime.Now.Add(TimeSpan.FromSeconds(30));
            bool isRunning = false;

            // Poll until the webserver is correctly serving pages.
            using var httpClient = new HttpClient();

            while (!isRunning && DateTime.Now < endTime)
            {
                try
                {
                    using var response = await httpClient.GetAsync(EnvironmentManager.Instance.UrlBuilder.LocalWhereIs("simpleTest.html"));

                    if (response.StatusCode == HttpStatusCode.OK)
                    {
                        isRunning = true;
                    }
                }
                catch (Exception ex) when (ex is HttpRequestException || ex is TimeoutException)
                {
                }
            }

            if (!isRunning)
            {
                string output = "'CaptureWebServerOutput' parameter is false. Web server output not captured";
                string error = "'CaptureWebServerOutput' parameter is false. Web server output not being captured.";
                if (captureWebServerOutput)
                {
                    error = webserverProcess.StandardError.ReadToEnd();
                    output = webserverProcess.StandardOutput.ReadToEnd();
                }

                string errorMessage = string.Format("Could not start the test web server in {0} seconds.\nWorking directory: {1}\nProcess Args: {2}\nstdout: {3}\nstderr: {4}", timeout.TotalSeconds, projectRootPath, processArguments, output, error);

                throw new TimeoutException(errorMessage);
            }
        }
    }

    public async Task StopAsync()
    {
        if (webserverProcess != null)
        {
            using (var httpClient = new HttpClient())
            {
                try
                {
                    using (await httpClient.GetAsync(EnvironmentManager.Instance.UrlBuilder.LocalWhereIs("quitquitquit")))
                    {

                    }
                }
                catch (HttpRequestException)
                {

                }
            }

            try
            {
                webserverProcess.WaitForExit(10000);
                if (!webserverProcess.HasExited)
                {
                    webserverProcess.Kill(entireProcessTree: true);
                }
            }
            finally
            {
                webserverProcess.Dispose();
                webserverProcess = null;
            }
        }
    }
}