// <copyright file="FirefoxDriverService.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 OpenQA.Selenium.Internal;
using System;
using System.Globalization;
using System.IO;
using System.Text;

namespace OpenQA.Selenium.Firefox
{
    /// <summary>
    /// Exposes the service provided by the native FirefoxDriver executable.
    /// </summary>
    public sealed class FirefoxDriverService : DriverService
    {
        private const string DefaultFirefoxDriverServiceFileName = "geckodriver";

        private bool connectToRunningBrowser;
        private bool openBrowserToolbox;
        private int browserCommunicationPort = -1;
        private string browserBinaryPath = string.Empty;
        private string host = string.Empty;
        private string browserCommunicationHost = string.Empty;
        private FirefoxDriverLogLevel loggingLevel = FirefoxDriverLogLevel.Default;

        /// <summary>
        /// Initializes a new instance of the <see cref="FirefoxDriverService"/> class.
        /// </summary>
        /// <param name="executablePath">The full path to the Firefox driver executable.</param>
        /// <param name="executableFileName">The file name of the Firefox driver executable.</param>
        /// <param name="port">The port on which the Firefox driver executable should listen.</param>
        private FirefoxDriverService(string executablePath, string executableFileName, int port)
            : base(executablePath, port, executableFileName)
        {
        }

        /// <inheritdoc />
        protected override DriverOptions GetDefaultDriverOptions()
        {
            return new FirefoxOptions();
        }

        /// <summary>
        /// Gets or sets the location of the Firefox binary executable.
        /// </summary>
        public string FirefoxBinaryPath
        {
            get { return this.browserBinaryPath; }
            set { this.browserBinaryPath = value; }
        }

        /// <summary>
        /// Gets or sets the port used by the driver executable to communicate with the browser.
        /// </summary>
        public int BrowserCommunicationPort
        {
            get { return this.browserCommunicationPort; }
            set { this.browserCommunicationPort = value; }
        }

        /// <summary>
        /// Gets or sets the value of the IP address of the host adapter used by the driver
        /// executable to communicate with the browser.
        /// </summary>
        public string BrowserCommunicationHost
        {
            get { return this.browserCommunicationHost; }
            set { this.browserCommunicationHost = value; }
        }

        /// <summary>
        /// Gets or sets the value of the IP address of the host adapter on which the
        /// service should listen for connections.
        /// </summary>
        public string Host
        {
            get { return this.host; }
            set { this.host = value; }
        }

        /// <summary>
        /// Gets or sets a value indicating whether to connect to an already-running
        /// instance of Firefox.
        /// </summary>
        public bool ConnectToRunningBrowser
        {
            get { return this.connectToRunningBrowser; }
            set { this.connectToRunningBrowser = value; }
        }

        /// <summary>
        /// Gets or sets a value indicating whether to open the Firefox Browser Toolbox
        /// when Firefox is launched.
        /// </summary>
        public bool OpenBrowserToolbox
        {
            get { return this.openBrowserToolbox; }
            set { this.openBrowserToolbox = value; }
        }

        /// <summary>
        /// Gets or sets the level at which log output is displayed.
        /// </summary>
        /// <remarks>
        /// This is largely equivalent to setting the <see cref="FirefoxOptions.LogLevel"/>
        /// property, except the log level is set when the driver launches, instead of
        /// when the browser is launched, meaning that initial driver logging before
        /// initiation of a session can be controlled.
        /// </remarks>
        public FirefoxDriverLogLevel LogLevel
        {
            get { return this.loggingLevel; }
            set { this.loggingLevel = value; }
        }

        /// <summary>
        /// Gets a value indicating the time to wait for the service to terminate before forcing it to terminate.
        /// </summary>
        protected override TimeSpan TerminationTimeout
        {
            // Use a very small timeout for terminating the Firefox driver,
            // because the executable does not have a clean shutdown command,
            // which means we have to kill the process. Using a short timeout
            // gets us to the termination point much faster.
            get { return TimeSpan.FromMilliseconds(100); }
        }

        /// <summary>
        /// Gets a value indicating whether the service has a shutdown API that can be called to terminate
        /// it gracefully before forcing a termination.
        /// </summary>
        protected override bool HasShutdown
        {
            // The Firefox driver executable does not have a clean shutdown command,
            // which means we have to kill the process.
            get { return false; }
        }

        /// <summary>
        /// Gets the command-line arguments for the driver service.
        /// </summary>
        protected override string CommandLineArguments
        {
            get
            {
                StringBuilder argsBuilder = new StringBuilder();
                if (this.connectToRunningBrowser)
                {
                    argsBuilder.Append(" --connect-existing");
                }
                else
                {
                    argsBuilder.Append(string.Format(CultureInfo.InvariantCulture, " --websocket-port {0}", PortUtilities.FindFreePort()));
                }

                if (this.browserCommunicationPort > 0)
                {
                    argsBuilder.AppendFormat(CultureInfo.InvariantCulture, " --marionette-port {0}", this.browserCommunicationPort);
                }

                if (!string.IsNullOrEmpty(this.browserCommunicationHost))
                {
                    argsBuilder.AppendFormat(CultureInfo.InvariantCulture, " --marionette-host \"{0}\"", this.host);
                }

                if (this.Port > 0)
                {
                    argsBuilder.AppendFormat(CultureInfo.InvariantCulture, " --port {0}", this.Port);
                }

                if (!string.IsNullOrEmpty(this.browserBinaryPath))
                {
                    argsBuilder.AppendFormat(CultureInfo.InvariantCulture, " --binary \"{0}\"", this.browserBinaryPath);
                }

                if (!string.IsNullOrEmpty(this.host))
                {
                    argsBuilder.AppendFormat(CultureInfo.InvariantCulture, " --host \"{0}\"", this.host);
                }

                if (this.loggingLevel != FirefoxDriverLogLevel.Default)
                {
                    argsBuilder.Append(string.Format(CultureInfo.InvariantCulture, " --log {0}", this.loggingLevel.ToString().ToLowerInvariant()));
                }

                if (this.openBrowserToolbox)
                {
                    argsBuilder.Append(" --jsdebugger");
                }

                return argsBuilder.ToString().Trim();
            }
        }

        /// <summary>
        /// Creates a default instance of the FirefoxDriverService.
        /// </summary>
        /// <returns>A FirefoxDriverService that implements default settings.</returns>
        public static FirefoxDriverService CreateDefaultService()
        {
            return new FirefoxDriverService(null, null, PortUtilities.FindFreePort());
        }


        /// <summary>
        /// Creates a default instance of the FirefoxDriverService using a specified path to the Firefox driver executable.
        /// </summary>
        /// <param name="driverPath">The path to the executable or the directory containing the Firefox driver executable.</param>
        /// <returns>A FirefoxDriverService using a random port.</returns>
        public static FirefoxDriverService CreateDefaultService(string driverPath)
        {
            string fileName;
            if (File.Exists(driverPath))
            {
                fileName = Path.GetFileName(driverPath);
                driverPath = Path.GetDirectoryName(driverPath);
            }
            else
            {
                fileName = FirefoxDriverServiceFileName();
            }

            return CreateDefaultService(driverPath, fileName);
        }

        /// <summary>
        /// Creates a default instance of the FirefoxDriverService using a specified path to the Firefox driver executable with the given name.
        /// </summary>
        /// <param name="driverPath">The directory containing the Firefox driver executable.</param>
        /// <param name="driverExecutableFileName">The name of the Firefox driver executable file.</param>
        /// <returns>A FirefoxDriverService using a random port.</returns>
        public static FirefoxDriverService CreateDefaultService(string driverPath, string driverExecutableFileName)
        {
            return new FirefoxDriverService(driverPath, driverExecutableFileName, PortUtilities.FindFreePort());
        }

        /// <summary>
        /// Returns the Firefox driver filename for the currently running platform
        /// </summary>
        /// <returns>The file name of the Firefox driver service executable.</returns>
        private static string FirefoxDriverServiceFileName()
        {
            string fileName = DefaultFirefoxDriverServiceFileName;

            // Unfortunately, detecting the currently running platform isn't as
            // straightforward as you might hope.
            // See: http://mono.wikia.com/wiki/Detecting_the_execution_platform
            // and https://msdn.microsoft.com/en-us/library/3a8hyw88(v=vs.110).aspx
            const PlatformID PlatformIDMonoUnix = (PlatformID)128;

            switch (Environment.OSVersion.Platform)
            {
                case PlatformID.Win32NT:
                case PlatformID.Win32S:
                case PlatformID.Win32Windows:
                case PlatformID.WinCE:
                    fileName += ".exe";
                    break;

                case PlatformID.MacOSX:
                case PlatformID.Unix:
                case PlatformIDMonoUnix:
                    break;

                // Don't handle the Xbox case. Let default handle it.
                // case PlatformID.Xbox:
                //     break;
                default:
                    throw new WebDriverException("Unsupported platform: " + Environment.OSVersion.Platform);
            }

            return fileName;
        }
    }
}
