using System.IO.Compression;
using MetaforceInstaller.Core.Models;

namespace MetaforceInstaller.Core.Services;

public class ZipScrapper
{
    public static InstallationParts PeekFiles(ZipArchive archive)
    {
        return new InstallationParts
        {
            AndroidContentPath = FindAndroidContent(archive),
            OculusClientPath = FindOculusClient(archive),
            PicoClientPath = FindPicoClient(archive),
            AndroidAdminPath = FindAndroidAdmin(archive),
            WindowsAdminPath = FindPcAdmin(archive),
            WindowsContentPath = FindWindowsContent(archive),
            WindowsServerPath = FindServer(archive),
        };
    }

    /// <summary>
    /// Extracts ZIP archive to a unique folder based on installation GUID
    /// </summary>
    /// <param name="archive">ZIP archive to extract</param>
    /// <param name="baseOutputPath">Base storage path</param>
    /// <param name="installationGuid">Unique GUID for this installation</param>
    /// <param name="progress">Progress reporter</param>
    /// <returns>Full path to the extracted folder</returns>
    public static string ExtractZip(
        ZipArchive archive, 
        string baseOutputPath, 
        Guid installationGuid,
        IProgress<double>? progress = null)
    {
        // Create unique folder for this installation
        var installationFolder = Path.Combine(baseOutputPath, installationGuid.ToString());
        Directory.CreateDirectory(installationFolder);

        var entries = archive.Entries.Where(e => !string.IsNullOrEmpty(e.Name)).ToList();
        var totalEntries = entries.Count;
        var processedEntries = 0;

        foreach (var entry in entries)
        {
            var destinationPath = Path.Combine(installationFolder, entry.FullName);
            var destinationDir = Path.GetDirectoryName(destinationPath);
            
            if (!string.IsNullOrEmpty(destinationDir))
            {
                Directory.CreateDirectory(destinationDir);
            }

            entry.ExtractToFile(destinationPath, overwrite: true);
            
            processedEntries++;
            progress?.Report((double)processedEntries / totalEntries * 100);
        }

        return installationFolder;
    }

    /// <summary>
    /// Updates InstallationParts paths to reflect the actual extracted location
    /// </summary>
    public static InstallationParts UpdatePathsAfterExtraction(
        InstallationParts parts, 
        string extractedFolderPath)
    {
        return new InstallationParts
        {
            AndroidContentPath = UpdatePath(parts.AndroidContentPath, extractedFolderPath),
            OculusClientPath = UpdatePath(parts.OculusClientPath, extractedFolderPath),
            PicoClientPath = UpdatePath(parts.PicoClientPath, extractedFolderPath),
            AndroidAdminPath = UpdatePath(parts.AndroidAdminPath, extractedFolderPath),
            WindowsAdminPath = UpdatePath(parts.WindowsAdminPath, extractedFolderPath),
            WindowsContentPath = UpdatePath(parts.WindowsContentPath, extractedFolderPath),
            WindowsServerPath = UpdatePath(parts.WindowsServerPath, extractedFolderPath),
        };
    }

    private static string? UpdatePath(string? relativePath, string basePath)
    {
        if (string.IsNullOrEmpty(relativePath))
            return null;

        return Path.Combine(basePath, relativePath);
    }

    private static string? FindPicoClient(ZipArchive archive)
    {
        return FindEntry(archive, 
            name: "MetaforcePico",
            extension: ".apk");
    }

    private static string? FindOculusClient(ZipArchive archive)
    {
        return FindEntry(archive,
            name: "MetaforceOculus",
            extension: ".apk");
    }

    private static string? FindAndroidAdmin(ZipArchive archive)
    {
        return FindEntry(archive,
            name: "MetaforceAdmin",
            extension: ".apk");
    }

    private static string? FindAndroidContent(ZipArchive archive)
    {
        return FindEntry(archive,
            name: "Content_Android",
            extension: ".zip");
    }

    private static string? FindWindowsContent(ZipArchive archive)
    {
        return FindEntry(archive,
            name: "Content_StandaloneWindows",
            extension: ".zip");
    }

    private static string? FindPcAdmin(ZipArchive archive)
    {
        return FindExecutable(archive, "MetaforceAdminPC");
    }

    private static string? FindServer(ZipArchive archive)
    {
        return FindExecutable(archive, "MetaforceServer");
    }

    /// <summary>
    /// Finds an entry in archive by name and extension
    /// </summary>
    private static string? FindEntry(ZipArchive archive, string name, string extension)
    {
        var entry = archive.Entries.FirstOrDefault(e =>
            e.Name.Contains(name, StringComparison.OrdinalIgnoreCase) &&
            e.Name.EndsWith(extension, StringComparison.OrdinalIgnoreCase));
        
        return entry?.FullName;
    }

    /// <summary>
    /// Finds an executable in archive, excluding crash handlers
    /// </summary>
    private static string? FindExecutable(ZipArchive archive, string containsName)
    {
        var entry = archive.Entries.FirstOrDefault(e =>
            e.FullName.Contains(containsName, StringComparison.OrdinalIgnoreCase) &&
            e.Name.EndsWith(".exe", StringComparison.OrdinalIgnoreCase) &&
            !e.Name.Contains("UnityCrashHandler", StringComparison.OrdinalIgnoreCase) &&
            !e.Name.Contains("crashpad_handler", StringComparison.OrdinalIgnoreCase));
        
        return entry?.FullName;
    }
}