// Copyright (c) 2012, Outercurve Foundation.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// - Redistributions of source code must  retain  the  above copyright notice, this
//   list of conditions and the following disclaimer.
//
// - Redistributions in binary form  must  reproduce the  above  copyright  notice,
//   this list of conditions  and  the  following  disclaimer in  the documentation
//   and/or other materials provided with the distribution.
//
// - Neither  the  name  of  the  Outercurve Foundation  nor   the   names  of  its
//   contributors may be used to endorse or  promote  products  derived  from  this
//   software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,  BUT  NOT  LIMITED TO, THE IMPLIED
// WARRANTIES  OF  MERCHANTABILITY   AND  FITNESS  FOR  A  PARTICULAR  PURPOSE  ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL,  SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO,  PROCUREMENT  OF  SUBSTITUTE  GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)  HOWEVER  CAUSED AND ON
// ANY  THEORY  OF  LIABILITY,  WHETHER  IN  CONTRACT,  STRICT  LIABILITY,  OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING  IN  ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using Microsoft.Web.PlatformInstaller;
using WebsitePanel.Server.Code;

namespace WebsitePanel.Server.WPIService
{
    // Define a service contract.
    //[ServiceContract(Namespace = "http://Helicon.Zoo.WPIService")]
    //public interface IWPIService
    //{
    //  //  [OperationContract]
    //    void Initialize(string[] feeds);
        
    //    //[OperationContract]
    //    void BeginInstallation(string[] productsToInstall);

    //    //[OperationContract]
    //    string GetStatus();

    //    string GetLogs();
    //}
    
    enum EWPIServiceStatus
    {
        Initialised,
        Installation,
        InstallationComplete,
        InstallationError
    }

    // Service class which implements the service contract.
    //[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
    class WPIService : WPIServiceContract
    {
        private WpiHelper  _wpiHelper;
        private string[] _productsToInstall;

        private EWPIServiceStatus _installationStatus;
        private string _statusMessage = "preparing...";

        private Thread _installerThread;
        private object _lock = new object();

        public bool IsFinished { get; private set; }

        #region IWPIService contract

        public override string Ping() 
        {
            return "OK";
        }
        
        public override void Initialize(string[] feeds)
        {
            lock (_lock)
            {
                if (_installationStatus == EWPIServiceStatus.Installation)
                {
                    throw new Exception("Invalid state, already in Installation process");
                }

                _installationStatus = EWPIServiceStatus.Initialised;

                if (_wpiHelper == null)
                {
                    _wpiHelper = new WpiHelper(feeds);
                    Console.WriteLine("_wpiHelper initialized");
                }
            }
        }

        public override void BeginInstallation(string[] productsToInstall)
        {
            lock (_lock)
            {

                if (_installationStatus != EWPIServiceStatus.Initialised)
                {
                    throw new Exception("Invalid state, expected EWPIServiceStatus.Initialised. now: " + _installationStatus);
                }

                _installationStatus = EWPIServiceStatus.Installation;
                _statusMessage = "Preparing for install";

                _productsToInstall = new string[productsToInstall.Length];
                productsToInstall.CopyTo(_productsToInstall,0);

                _installerThread = new Thread(new ThreadStart(InternalBeginInstallation));
                _installerThread.Start();
            }
        }


        public override string GetStatus()
        {

            lock(_lock)
            {

                string result = this._statusMessage;

                //Allow exit from app, if finished
                IsInstallationProceed();
                
                return result;
            }
        }

        public override string GetLogFileDirectory()
        {

            lock (_lock)
            {
                return null != _wpiHelper ? _wpiHelper.GetLogFileDirectory() : null;
            }
        }

        #endregion

        #region private implementaion
        private bool IsInstallationProceed()
        {
            if (_installationStatus == EWPIServiceStatus.InstallationComplete)
            {
                IsFinished = true;
                return false;
            }
            else if (_installationStatus == EWPIServiceStatus.InstallationError)
            {
                IsFinished = true;
                return false;
            }

            return true;
        }


        private void InternalBeginInstallation()
        {
            _wpiHelper.InstallProducts(
                _productsToInstall,
                WpiHelper.DeafultLanguage,
                InstallStatusUpdatedHandler, 
                InstallCompleteHandler
            );

            lock (_lock)
            {
                _installationStatus = EWPIServiceStatus.InstallationComplete;
            }
        }

        private void InstallCompleteHandler(object sender, EventArgs eventArgs)
        {
            lock(_lock)
            {
                _installationStatus = EWPIServiceStatus.InstallationComplete;
            }
        }

        
        private void InstallStatusUpdatedHandler(object sender, InstallStatusEventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendFormat("{0}: ", e.InstallerContext.ProductName);

            switch (e.InstallerContext.InstallationState)
            {
                case InstallationState.Waiting:
                    sb.Append("please wait...").AppendLine();
                    break;
                case InstallationState.Downloading:
                    sb.Append("downloading").AppendLine();
                    if (e.ProgressValue > 0)
                    {
                        sb.AppendFormat("{0} of {1} Kb downloaded", e.ProgressValue,
                                        e.InstallerContext.Installer.InstallerFile.FileSize);
                        sb.AppendLine();
                    }
                    break;
                case InstallationState.Downloaded:
                    sb.Append("downloaded").AppendLine();
                    break;
                case InstallationState.DownloadFailed:
                    sb.AppendFormat("download failed").AppendLine();
                    sb.AppendLine(e.InstallerContext.InstallStateDetails);
                    break;
                case InstallationState.DependencyFailed:
                    sb.AppendFormat("dependency failed").AppendLine();
                    sb.AppendLine(e.InstallerContext.InstallStateDetails);
                    sb.AppendFormat("{0}: {1}", e.InstallerContext.ReturnCode.Status, e.InstallerContext.ReturnCode.DetailedInformation).AppendLine();
                    break;
                case InstallationState.Installing:
                    sb.Append("installing").AppendLine();
                    break;
                case InstallationState.InstallCompleted:
                    sb.Append("install completed").AppendLine();
                    break;
                case InstallationState.Canceled:
                    sb.AppendFormat("canceled").AppendLine();
                    sb.AppendLine(e.InstallerContext.InstallStateDetails);
                    sb.AppendFormat("{0}: {1}", e.InstallerContext.ReturnCode.Status, e.InstallerContext.ReturnCode.DetailedInformation).AppendLine();
                    break;
                default:
                    throw new ArgumentOutOfRangeException();
            }

            lock (_lock)
            {
                _statusMessage = sb.ToString();
            }
        }
        #endregion
    }
}