#if UNITY_EDITOR_WIN
using System;
using System.Diagnostics;
using System.IO;
using UnityEditor;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;
using UnityEditor.UnityLinker;
using UnityEngine;
using PlayerSettings = UnityEditor.PlayerSettings;
using WW1.PlayStation;

internal class BuildPackageLibs : IPreprocessBuildWithReport, IMovePRXCallback
{
    public int callbackOrder => 0;
    static string PackageName => "com.ww1gameseries.pssr";
    static string SourcePath => $"Packages/{PackageName}/Source~";
    const int k_PRXBuildTimeOutS = 600; //10 minutes is the max time allowed to build the PRX

    #region CompileLibs
    readonly string[] m_CompileAgainstLibs = new string[]
    {
	    "SceSysmodule_stub_weak",
	    "ScePsml",
	    "ScePsml_stub_weak",
	    "SceAgcGnmp",
	    "SceAgc",
	    "SceAgcCore",
	    "SceAgcGpuAddress",
	    "SceVideoOut_stub_weak",
	    "SceAgcDriver_stub_weak",
	    "SceAgc_stub_weak",
    };
    #endregion

    public void OnPreprocessBuild(BuildReport report)
    {
        var buildTarget = report.summary.platform;
        if (!IsBuildTargetValid(buildTarget))
        {
            return;
        }

        string prxPath = GetPRXBuildLocation(buildTarget);
        string prxDir = Path.GetDirectoryName(prxPath);

        if (IsPRXRebuildRequired(prxPath))
        {
            if (!Directory.Exists(prxDir))
            {
                if (string.IsNullOrWhiteSpace(prxDir))
                {
                    throw new BuildFailedException("No PRX Directory");
                }
                Directory.CreateDirectory(prxDir);
            }

            BuildPackagePRX(buildTarget, prxPath, m_CompileAgainstLibs);
        }
    }

    public void MovePRXToBuildLocation(BuildTarget target, string buildOutputLocation, bool developmentBuild)
    {
        if (!IsBuildTargetValid(target))
        {
            return;
        }

        string projectDir = Application.dataPath.Replace("/Assets", "");
        string stagingArea = BuildUtils.GetStagingAreaLocationFor(target, projectDir, buildOutputLocation);
        CopyLibraryPRXToStagingArea(GetPRXBuildLocation(target), stagingArea);
    }

    static bool IsPRXRebuildRequired(string prxPath)
    {
        if (!File.Exists(prxPath))
        {
            return true;
        }

        DateTime prxLastWrite = File.GetLastWriteTimeUtc(prxPath);
        if (BuildUtils.HaveSourceFilesBeenModifiedSince(SourcePath, prxLastWrite))
        {
            return true;
        }

        return false;
    }

    static void BuildPackagePRX(BuildTarget target, string outputPath, string[] compileAgainstLibs)
    {
        string sdkLoc = Environment.GetEnvironmentVariable(SDKUtils.GetSdkEnvVarFor(target));
        string clangLoc = $"{sdkLoc}/host_tools/bin/{SDKUtils.GetClangFor(target)}";

        string allSourcePaths = string.Empty;
        string[] allDirs = Directory.GetDirectories(SourcePath, "*", SearchOption.AllDirectories);

        //Include the base folder also, if it has cpp files in it
        if (Directory.GetFiles(SourcePath, "*.cpp").Length > 0)
        {
            allSourcePaths += $"\"{Path.GetFullPath(Path.Combine(SourcePath, "*.cpp"))}\" ";
        }

        foreach (var dir in allDirs)
        {
            if (Directory.GetFiles(dir, "*.cpp").Length == 0)
            {
                continue;
            }
            allSourcePaths += $"\"{Path.GetFullPath(Path.Combine(dir, "*.cpp"))}\" ";
        }

        string allLinkLibs = string.Empty;
        foreach (var lib in compileAgainstLibs)
        {
            allLinkLibs += $"-l {lib} ";
        }

        //Additionally include the common includes
        string command = $"-D\"NDEBUG\" -O2 -Wall -o\"{outputPath}\" {allSourcePaths} --for-linker=--oformat=prx {allLinkLibs}";

        ProcessStartInfo startInfo = new ProcessStartInfo(clangLoc, command)
        {
            CreateNoWindow = true,
            UseShellExecute = false,
            RedirectStandardError = true,
        };

        Console.WriteLine($"Building PRX with {clangLoc} {command}");
        Process proc = Process.Start(startInfo);
        string errorOutput = proc.StandardError.ReadToEnd();
        proc.WaitForExit(k_PRXBuildTimeOutS);
        if (!proc.HasExited)
        {
            proc.Kill();
            throw new BuildFailedException($"PRX Build Timed Out\n{errorOutput}");
        }

        if (proc.ExitCode != 0)
        {
            throw new BuildFailedException(errorOutput);
        }
    }

    static void CopyLibraryPRXToStagingArea(string prxLocation, string stagingArea)
    {
        string copyPath = Path.Combine(stagingArea, LibraryInfo.LibraryNameWithExtension);
        if (!Directory.Exists(stagingArea))
        {
            Directory.CreateDirectory(stagingArea);
        }

        File.Copy(prxLocation, copyPath, true);
    }

    static string GetPRXBuildLocation(BuildTarget target)
    {
        //Example Path: Library/SourceGeneratedPlugins/PS5/7000045/CommonDialog.prx
        string relativePath = Path.Combine("Library", "SourceGeneratedPlugins", target.ToString(),
            SDKUtils.GetSDKVersionString(target), $"{LibraryInfo.LibraryNameWithExtension}");
        return Path.GetFullPath(relativePath);
    }

    static bool IsBuildTargetValid(BuildTarget target)
    {
        return target is BuildTarget.PS5;
    }
}

internal interface IMovePRXCallback : IUnityLinkerProcessor
{
    string IUnityLinkerProcessor.GenerateAdditionalLinkXmlFile(BuildReport report, UnityLinkerBuildPipelineData data)
    {
        //In 2021.3 report can return null for non-playstation platforms
        if (report == null)
        {
            return string.Empty;
        }

        MovePRXToBuildLocation(report.summary.platform, report.summary.outputPath, report.summary.options.HasFlag(BuildOptions.Development));
        return string.Empty;
    }

    public void MovePRXToBuildLocation(BuildTarget target, string buildOutputLocation, bool developmentBuild);
}
#endif