using System;
using System.Drawing;
using System.IO;
using System.Linq;
using Katteker;
using TsudaKageyu;
using Vestris.ResourceLib;

namespace KattekerCreator
{
    public class AssemblyFileInfo
    {
        private readonly string _company;
        private readonly string _copyright;
        private readonly string _description;
        private readonly string _productName;

        public AssemblyFileInfo(string fileName, string tempDir)
        {
            FileInfo = new FileInfo(fileName);
            using (var resourceInfo = new ResourceInfo())
            {
                resourceInfo.Load(fileName);
                var versionResource = (VersionResource) resourceInfo[Kernel32.ResourceTypes.RT_VERSION].First();
                var stringFileInfo = ((StringFileInfo) versionResource[nameof(StringFileInfo)]).Strings.FirstOrDefault()
                    .Value;
                AssemblyIconPath = GetAssemblyIcon(fileName, tempDir);
                if (stringFileInfo.Strings.ContainsKey("CompanyName"))
                    _company = stringFileInfo.Strings["CompanyName"].StringValue;
                if (stringFileInfo.Strings.ContainsKey("FileDescription"))
                    _description = stringFileInfo.Strings["FileDescription"].StringValue;
                if (stringFileInfo.Strings.ContainsKey("LegalCopyright"))
                    _copyright = stringFileInfo.Strings["LegalCopyright"].StringValue;
                if (stringFileInfo.Strings.ContainsKey("ProductName"))
                    _productName = stringFileInfo.Strings["ProductName"].StringValue;
                if (!stringFileInfo.Strings.ContainsKey("ProductVersion")) return;
                AssemblyVersion = GetSemanticVersion(stringFileInfo.Strings["ProductVersion"].StringValue);
            }
        }

        public string AssemblyIconPath { get; }

        public SemanticVersion AssemblyVersion { get; private set; }

        public string Company => _company ?? string.Empty;

        public string Copyright => _copyright ?? string.Empty;

        public string Description => _description ?? string.Empty;

        public FileInfo FileInfo { get; }

        public string ProductName => _productName ?? Description;

        private static string GetAssemblyIcon(string programFile, string tempDir)
        {
            var applicationIcon = Path.Combine(tempDir, "application.ico");
            if (string.IsNullOrWhiteSpace(programFile)) throw new ApplicationException("Program not set.");
            if (!File.Exists(programFile)) throw new ApplicationException("Program not found.");
            if (File.Exists(applicationIcon)) File.Delete(applicationIcon);
            using (var fileStream = new FileStream(applicationIcon, FileMode.CreateNew))
            {
                try
                {
                    var ie = new IconExtractor(programFile);
                    using (var icon = ie.GetIcon(0))
                    {
                        icon?.Save(fileStream);
                    }
                }
                catch (Exception)
                {
                    using (var icon = Icon.ExtractAssociatedIcon(programFile))
                    {
                        icon?.Save(fileStream);
                    }
                }
            }

            return applicationIcon;
        }

        private static SemanticVersion GetSemanticVersion(string productVersion)
        {
            if (!SemanticVersion.TryParse(productVersion, out var semanticVersion))
            {
                Version.TryParse(productVersion, out var version);
                return SemanticVersion.Parse(version.ToString(3));
            }
            return semanticVersion?.Change(build: string.Empty);
        }
    }
}