// Copyright (c) 2018, Rene Lergner - @Heathcliff74xda
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace WPinternals
{
    internal static class TestCode
    {
        internal static async Task Test(System.Threading.SynchronizationContext UIContext)
        {
            // To avoid warnings when there is no code here.
            await Task.Run(() => { });

            // PhoneNotifierViewModel Notifier = new PhoneNotifierViewModel();
            // Notifier.Start();
            // await SwitchModeViewModel.SwitchTo(Notifier, PhoneInterfaces.Lumia_MassStorage);
            // MassStorage MassStorage = (MassStorage)Notifier.CurrentModel;
        }

        internal static async Task RecoverBadGPT(string GPTPath, string LoadersPath)
        {
            byte[] GPT = File.ReadAllBytes(GPTPath);

            PhoneNotifierViewModel PhoneNotifier = new();
            PhoneNotifier.Start();
            await SwitchModeViewModel.SwitchTo(PhoneNotifier, PhoneInterfaces.Qualcomm_Download);

            byte[] RootKeyHash = null;
            if (PhoneNotifier.CurrentInterface == PhoneInterfaces.Qualcomm_Download)
            {
                QualcommDownload Download2 = new((QualcommSerial)PhoneNotifier.CurrentModel);
                RootKeyHash = Download2.GetRKH();
            }

            List<QualcommPartition> PossibleLoaders = null;
            if (PhoneNotifier.CurrentInterface == PhoneInterfaces.Qualcomm_Download)
            {
                try
                {
                    PossibleLoaders = QualcommLoaders.GetPossibleLoadersForRootKeyHash(LoadersPath, RootKeyHash);
                    if (PossibleLoaders.Count == 0)
                    {
                        throw new Exception("Error: No matching loaders found for RootKeyHash.");
                    }
                }
                catch (Exception Ex)
                {
                    LogFile.LogException(Ex);
                    throw new Exception("Error: Unexpected error during scanning for loaders.");
                }
            }

            QualcommSerial Serial = (QualcommSerial)PhoneNotifier.CurrentModel;
            QualcommDownload Download = new(Serial);
            if (Download.IsAlive())
            {
                int Attempt = 1;
                bool Result = false;
                foreach (QualcommPartition Loader in PossibleLoaders)
                {
                    LogFile.Log("Attempt " + Attempt.ToString(), LogType.ConsoleOnly);

                    try
                    {
                        Download.SendToPhoneMemory(0x2A000000, Loader.Binary);
                        Download.StartBootloader(0x2A000000);
                        Result = true;
                        LogFile.Log("Loader sent successfully", LogType.ConsoleOnly);
                    }
                    catch { }

                    if (Result)
                    {
                        break;
                    }

                    Attempt++;
                }
                Serial.Close();

                if (!Result)
                {
                    LogFile.Log("Loader failed", LogType.ConsoleOnly);
                }
            }
            else
            {
                LogFile.Log("Failed to communicate to Qualcomm Emergency Download mode", LogType.ConsoleOnly);
                throw new BadConnectionException();
            }

            if (PhoneNotifier.CurrentInterface != PhoneInterfaces.Qualcomm_Flash)
            {
                await PhoneNotifier.WaitForArrival();
            }

            if (PhoneNotifier.CurrentInterface != PhoneInterfaces.Qualcomm_Flash)
            {
                throw new WPinternalsException("Phone failed to switch to emergency flash mode.");
            }

            // Flash bootloader
            QualcommSerial Serial2 = (QualcommSerial)PhoneNotifier.CurrentModel;
            Serial2.EncodeCommands = false;

            QualcommFlasher Flasher = new(Serial2);

            Flasher.Hello();
            Flasher.SetSecurityMode(0);
            Flasher.OpenPartition(0x21);

            LogFile.Log("Partition opened.", LogType.ConsoleOnly);

            LogFile.Log("Flash GPT at 0x" + ((UInt32)0x200).ToString("X8"), LogType.ConsoleOnly);
            Flasher.Flash(0x200, GPT, 0, 0x41FF); // Bad bounds-check in the flash-loader prohibits to write the last byte.

            Flasher.ClosePartition();

            LogFile.Log("Partition closed. Flashing ready. Rebooting.");

            Flasher.Reboot();

            Flasher.CloseSerial();
        }

        internal static async Task RewriteGPT(string GPTPath)
        {
            PhoneNotifierViewModel Notifier = new();
            Notifier.Start();
            await SwitchModeViewModel.SwitchTo(Notifier, PhoneInterfaces.Lumia_MassStorage);
            MassStorage MassStorage = (MassStorage)Notifier.CurrentModel;

            LogFile.Log("Writing GPT to the device.", LogType.ConsoleOnly);
            MassStorage.WriteSectors(1, GPTPath);
        }

        internal static async Task RewriteMBRGPT()
        {
            FFU FFU = new(@"E:\Device Backups\Alpha\9200_1230.0025.9200.9825\RX100_9825.ffu");
            const string GPTPath = @"E:\Device Backups\Alpha\9200_1230.0025.9200.9825\CorrectGPT.bin";

            PhoneNotifierViewModel Notifier = new();
            Notifier.Start();
            await SwitchModeViewModel.SwitchTo(Notifier, PhoneInterfaces.Lumia_MassStorage);
            MassStorage MassStorage = (MassStorage)Notifier.CurrentModel;

            byte[] MBR = FFU.GetSectors(0, 1);
            LogFile.Log("Writing MBR to the device.", LogType.ConsoleOnly);
            MassStorage.WriteSectors(0, MBR);

            LogFile.Log("Writing GPT to the device.", LogType.ConsoleOnly);
            MassStorage.WriteSectors(1, GPTPath);
        }

        internal static async Task RewriteParts(string PartPath)
        {
            PhoneNotifierViewModel Notifier = new();
            Notifier.Start();
            await SwitchModeViewModel.SwitchTo(Notifier, PhoneInterfaces.Lumia_MassStorage);
            MassStorage MassStorage = (MassStorage)Notifier.CurrentModel;

            foreach (var part in Directory.EnumerateFiles(PartPath))
            {
                var partname = part.Split('\\').Last().Replace(".img", "");
                try
                {
                    LogFile.Log($"Writing {partname} to the device.", LogType.ConsoleOnly);

                    LogFile.Log("", LogType.ConsoleOnly);

                    MassStorage.RestorePartition(part, partname, (v, t) => LogFile.Log("Progress: " + v + "%", LogType.ConsoleOnly));
                    LogFile.Log("", LogType.ConsoleOnly);
                }
                catch
                {
                    LogFile.Log("", LogType.ConsoleOnly);
                    LogFile.Log($"Failed writing {partname} to the device.", LogType.ConsoleOnly);
                }
            }
        }

        internal static void PatchImg(string dump)
        {
            using var fil = File.Open(dump, FileMode.Open);
            byte[] gptbuffer = new byte[0x4200];

            fil.Seek(0x200, SeekOrigin.Begin);
            fil.Read(gptbuffer, 0, 0x4200);

            uint BackupLBA = ByteOperations.ReadUInt32(gptbuffer, 0x20);
            uint LastUsableLBA = ByteOperations.ReadUInt32(gptbuffer, 0x30);

            LogFile.Log("Previous BackupLBA: " + BackupLBA, LogType.ConsoleOnly);
            LogFile.Log("Previous LastUsableLBA: " + LastUsableLBA, LogType.ConsoleOnly);

            const uint NewBackupLBA = 62078975u;
            const uint NewLastUsableLBA = 62078942u;

            ByteOperations.WriteUInt32(gptbuffer, 0x20, NewBackupLBA);
            ByteOperations.WriteUInt32(gptbuffer, 0x30, NewLastUsableLBA);

            uint HeaderSize = ByteOperations.ReadUInt32(gptbuffer, 0x0C);
            uint PrevCRC = ByteOperations.ReadUInt32(gptbuffer, 0x10);

            LogFile.Log("Previous CRC: " + PrevCRC, LogType.ConsoleOnly);

            ByteOperations.WriteUInt32(gptbuffer, 0x10, 0);
            uint NewCRC = ByteOperations.CRC32(gptbuffer, 0, HeaderSize);

            LogFile.Log("New CRC: " + NewCRC, LogType.ConsoleOnly);

            ByteOperations.WriteUInt32(gptbuffer, 0x10, NewCRC);

            LogFile.Log("Writing", LogType.ConsoleOnly);

            fil.Seek(0x200, SeekOrigin.Begin);
            fil.Write(gptbuffer, 0, 0x4200);

            LogFile.Log("Done!", LogType.ConsoleOnly);
        }

        internal static async Task TestProgrammer(System.Threading.SynchronizationContext UIContext, string ProgrammerPath)
        {
            LogFile.BeginAction("TestProgrammer");
            try
            {
                LogFile.Log("Starting Firehose Test", LogType.FileAndConsole);

                PhoneNotifierViewModel Notifier = new();
                UIContext.Send(s => Notifier.Start(), null);
                if (Notifier.CurrentInterface == PhoneInterfaces.Qualcomm_Download)
                {
                    LogFile.Log("Phone found in emergency mode", LogType.FileAndConsole);
                }
                else
                {
                    LogFile.Log("Phone needs to be switched to emergency mode.", LogType.FileAndConsole);
                    await SwitchModeViewModel.SwitchTo(Notifier, PhoneInterfaces.Lumia_Flash);
                    PhoneInfo Info = ((NokiaFlashModel)Notifier.CurrentModel).ReadPhoneInfo();
                    Info.Log(LogType.ConsoleOnly);
                    await SwitchModeViewModel.SwitchTo(Notifier, PhoneInterfaces.Qualcomm_Download);
                    if (Notifier.CurrentInterface != PhoneInterfaces.Qualcomm_Download)
                    {
                        throw new WPinternalsException("Switching mode failed.", "Could not switch the phone to Qualcomm Emergency 9008.");
                    }

                    LogFile.Log("Phone is in emergency mode.", LogType.FileAndConsole);
                }

                // Send and start programmer
                QualcommSerial Serial = (QualcommSerial)Notifier.CurrentModel;
                QualcommSahara Sahara = new(Serial);

                if (await Sahara.Reset(ProgrammerPath))
                {
                    LogFile.Log("Emergency programmer test succeeded", LogType.FileAndConsole);
                }
                else
                {
                    LogFile.Log("Emergency programmer test failed", LogType.FileAndConsole);
                }
            }
            catch (Exception Ex)
            {
                LogFile.LogException(Ex);
            }
            finally
            {
                LogFile.EndAction("TestProgrammer");
            }
        }
    }
}