using System.Drawing;
using System.Globalization;
using System.Xml.Linq;
using MaddoShared;

namespace CatalogLite;

public sealed class CatalogConfigurationLoader
{
    public CatalogLiteConfiguration Load(string filePath, PicSettings picSettings)
    {
        if (string.IsNullOrWhiteSpace(filePath))
        {
            throw new ArgumentException("Percorso configurazione non valido.", nameof(filePath));
        }

        if (!File.Exists(filePath))
        {
            throw new FileNotFoundException("File configurazione non trovato.", filePath);
        }

        var values = ConfigurationValues.Load(filePath);
        ApplyPicSettings(values, picSettings);

        var sourcePath = LiteCatalogViewModel.NormalizeDirectoryPath(values.GetString("DirSorgente"));
        var destinationPath = LiteCatalogViewModel.NormalizeDirectoryPath(values.GetString("DirDestinazione"));

        picSettings.DirectorySorgente = sourcePath;
        picSettings.DirectoryDestinazione = destinationPath;
        picSettings.DestDir = string.IsNullOrWhiteSpace(destinationPath)
            ? new DirectoryInfo(Environment.CurrentDirectory)
            : new DirectoryInfo(destinationPath);

        return new CatalogLiteConfiguration
        {
            FilePath = filePath,
            SourcePath = sourcePath,
            DestinationPath = destinationPath,
            Options = BuildOptions(values, sourcePath, destinationPath)
        };
    }

    public static ImageCreationService.Options CloneOptions(ImageCreationService.Options options, string sourcePath, string destinationPath)
    {
        return new ImageCreationService.Options
        {
            AggiornaSottodirectory = options.AggiornaSottodirectory,
            CreaSottocartelle = options.CreaSottocartelle,
            FilePerCartella = options.FilePerCartella,
            SuffissoCartelle = options.SuffissoCartelle,
            CifreContatore = options.CifreContatore,
            NumerazioneType = options.NumerazioneType,
            SourcePath = sourcePath,
            DestinationPath = destinationPath,
            MaxThreads = Math.Max(1, options.MaxThreads),
            ChunksSize = options.ChunksSize,
            LinearExecution = options.LinearExecution
        };
    }

    private static void ApplyPicSettings(ConfigurationValues values, PicSettings settings)
    {
        settings.DirectorySorgente = values.GetString("DirSorgente");
        settings.DirectoryDestinazione = values.GetString("DirDestinazione");
        settings.TestoFirmaStart = values.GetString("TestoTesto");
        settings.TestoFirmaStartV = values.GetString("TestoVerticale");
        settings.DataPartenza = values.GetDateTime("DataPartenza", DateTime.Now);
        settings.TestoOrario = values.GetString("EtichettaOrario");
        settings.DimStandard = values.GetInt("FontDimensione", 20);
        settings.DimStandardMiniatura = values.GetInt("FontDimensioneMiniatura", 50);
        settings.NomeData = values.GetBool("DataFoto");
        settings.TestoNome = values.GetBool("NumeroFoto");
        settings.UsaOrarioMiniatura = IsThumbnailMode(values, "Time") || values.GetBool("MiniatureAddOrario");
        settings.UsaOrarioTestoApplicare = values.GetBool("Orario");
        settings.UsaTempoGaraTestoApplicare = values.GetBool("TempoGara");
        settings.UsaRotazioneAutomatica = values.GetBool("GeneraleRotazioneAutomatica");
        settings.UsaForzaJpg = values.GetBool("GeneraleForzaJpg");
        settings.LarghezzaSmall = values.GetInt("MiniatureLarghezza", 350);
        settings.AltezzaSmall = values.GetInt("MiniatureAltezza", 350);
        settings.CreaMiniature = values.GetBool("MiniatureCrea", true);
        settings.AggiungiScritteMiniature = IsThumbnailMode(values, "Text") || values.GetBool("MiniatureAddScritta");
        settings.Suffisso = values.GetString("MiniatureSuffisso", "tn_");
        settings.Codice = values.GetString("FotoCodice");
        settings.Trasparenza = values.GetInt("TestoTrasparente", 0);
        settings.IlFont = values.GetString("FontNome", "Arial");
        settings.Grassetto = values.GetBool("FontBold");
        settings.Posizione = values.GetString("TestoPosizione", "Basso");
        settings.Allineamento = values.GetString("TestoAllineamento", "Centro");
        settings.Margine = values.GetInt("TestoMargine", 8);
        settings.LogoAltezza = values.GetInt("MarchioAltezza", 430);
        settings.LogoLarghezza = values.GetInt("MarchioLarghezza", 430);
        settings.FontColoreRGB = ParseColor(values.GetString("ColoreTestoRGB", "Yellow"), Color.Yellow);
        settings.LogoAggiungi = values.GetBool("MarchioAggiungi");
        settings.LogoNomeFile = values.GetString("MarchioFile");
        settings.LogoTrasparenza = values.GetInt("MarchioTrasparenza", 100).ToString(CultureInfo.InvariantCulture);
        settings.LogoMargine = values.GetString("MarchioMargine", "0");
        settings.LogoPosizioneH = values.GetString("MarchioAllOrizzontale", "Destra");
        settings.LogoPosizioneV = values.GetString("MarchioAllVerticale", "Basso");
        settings.TransparentColor = values.GetString("ColoreTrasparente", "#FFFFFF");
        settings.UseTransparentColor = values.GetBool("UsaColoreTrasparente");
        settings.FotoGrandeDimOrigina = values.GetBool("FotoDimOriginali");
        settings.AltezzaBig = values.GetInt("FotoAltezza", 2240);
        settings.LarghezzaBig = values.GetInt("FotoLarghezza", 2240);
        settings.DimVert = values.GetInt("GrandezzaVerticale", 20);
        settings.MargVert = values.GetInt("MargineVerticale", 6);
        settings.TestoMin = IsThumbnailMode(values, "FileName") || values.GetBool("NomeMiniatura");
        settings.DimMin = values.GetInt("FontDimensioneMiniatura", 50);
        settings.SecretDefault = false;
        settings.SecretBig = false;
        settings.SecretSmall = false;
        settings.SecretPathSmall = string.Empty;
        settings.SecretPathBig = string.Empty;
        settings.AggTempoGaraMin = IsThumbnailMode(values, "RaceTime") || values.GetBool("TempoSmall");
        settings.AggNumTempMin = IsThumbnailMode(values, "FileNameAndTime") || values.GetBool("NumTempoSmall");
        settings.JpegQuality = values.GetLong("CompressioneJpeg", 85);
        settings.JpegQualityMin = values.GetLong("CompressioneJpegMiniatura", 30);
        settings.FotoRuotaADestra = false;
        settings.FotoRuotaASinistra = false;
        settings.TempMinText = string.Empty;
        settings.OverwriteFiles = values.GetBool("GeneraleSovrascriviFile");
        settings.ImageCreatorProvider = "ImageSharp";
    }

    private static ImageCreationService.Options BuildOptions(ConfigurationValues values, string sourcePath, string destinationPath)
    {
        var threads = values.GetInt("ThreadsCount", Environment.ProcessorCount);
        if (threads <= 0)
        {
            threads = Environment.ProcessorCount;
        }

        return new ImageCreationService.Options
        {
            AggiornaSottodirectory = values.GetBool("DirSottoDirectory"),
            CreaSottocartelle = values.GetBool("DirCreaSottocartelle", values.GetBool("CreateSubfolders")),
            FilePerCartella = Math.Max(1, values.GetInt("DirDividiNumFile", 99)),
            SuffissoCartelle = values.GetString("DirDividiSuffisso"),
            CifreContatore = Math.Max(1, values.GetInt("DirDividiNumCifre", 2)),
            NumerazioneType = values.GetBool("DirNumerazioneProgressiva", true) ? NumerazioneType.Progressiva : NumerazioneType.Files,
            SourcePath = sourcePath,
            DestinationPath = destinationPath,
            MaxThreads = Math.Max(1, threads),
            ChunksSize = Math.Max(0, values.GetInt("ChunkSize", 0)),
            LinearExecution = values.GetBool("UseSequentialProcessing")
        };
    }

    private static bool IsThumbnailMode(ConfigurationValues values, string mode)
    {
        return string.Equals(values.GetString("MiniatureModalita"), mode, StringComparison.OrdinalIgnoreCase);
    }

    private static Color ParseColor(string value, Color fallback)
    {
        if (string.IsNullOrWhiteSpace(value))
        {
            return fallback;
        }

        var normalized = value.Trim();
        try
        {
            if (normalized.StartsWith('#') && normalized.Length == 7)
            {
                return Color.FromArgb(
                    Convert.ToInt32(normalized[1..3], 16),
                    Convert.ToInt32(normalized[3..5], 16),
                    Convert.ToInt32(normalized[5..7], 16));
            }

            var named = Color.FromName(normalized);
            return named.IsKnownColor || named.IsNamedColor ? named : fallback;
        }
        catch
        {
            return fallback;
        }
    }

    private sealed class ConfigurationValues
    {
        private readonly Dictionary<string, string> _values;

        private ConfigurationValues(Dictionary<string, string> values)
        {
            _values = values;
        }

        public static ConfigurationValues Load(string filePath)
        {
            var document = XDocument.Load(filePath);
            var values = document
                .Descendants("Setup")
                .Where(element => element.Element("Nome") is not null)
                .GroupBy(element => element.Element("Nome")!.Value, StringComparer.OrdinalIgnoreCase)
                .ToDictionary(
                    group => group.Key,
                    group => group.Last().Element("Valore")?.Value ?? string.Empty,
                    StringComparer.OrdinalIgnoreCase);

            if (values.Count == 0)
            {
                values = document.Root?
                    .Descendants()
                    .Where(element => !element.HasElements)
                    .GroupBy(element => element.Name.LocalName, StringComparer.OrdinalIgnoreCase)
                    .ToDictionary(group => group.Key, group => group.Last().Value, StringComparer.OrdinalIgnoreCase)
                    ?? new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
            }

            return new ConfigurationValues(values);
        }

        public string GetString(string name, string defaultValue = "")
        {
            return _values.TryGetValue(name, out var value) && !string.IsNullOrWhiteSpace(value)
                ? value.Trim()
                : defaultValue;
        }

        public bool GetBool(string name, bool defaultValue = false)
        {
            var value = GetString(name);
            if (string.IsNullOrWhiteSpace(value))
            {
                return defaultValue;
            }

            return value.Trim().ToUpperInvariant() switch
            {
                "TRUE" or "OK" or "SI" or "SÌ" or "1" or "YES" or "VERO" => true,
                "FALSE" or "NO" or "0" or "FALSO" => false,
                _ => defaultValue
            };
        }

        public int GetInt(string name, int defaultValue = 0)
        {
            return int.TryParse(GetString(name), NumberStyles.Integer, CultureInfo.InvariantCulture, out var value)
                ? value
                : defaultValue;
        }

        public long GetLong(string name, long defaultValue = 0)
        {
            return long.TryParse(GetString(name), NumberStyles.Integer, CultureInfo.InvariantCulture, out var value)
                ? value
                : defaultValue;
        }

        public DateTime GetDateTime(string name, DateTime defaultValue)
        {
            var value = GetString(name);
            if (DateTime.TryParse(value, CultureInfo.InvariantCulture, DateTimeStyles.AssumeLocal, out var invariantDate))
            {
                return invariantDate;
            }

            return DateTime.TryParse(value, CultureInfo.CurrentCulture, DateTimeStyles.AssumeLocal, out var localDate)
                ? localDate
                : defaultValue;
        }
    }
}