using SSPCTester.Logic.Models;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace SSPCTester.Logic.Report;

public enum ReportOutputFormat
{
    Pdf,
    Word,
    Both
}

public static class ReportFileHelper
{
    public const string DefaultTemplate = "report_{yyyyMMdd_HHmmss}.pdf";
    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        WriteIndented = true,
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
    };

    public static string ResolveFileName(Project project, DateTime now)
        => ResolveFileName(project, now, ".pdf");

    public static string ResolveFileName(Project project, DateTime now, string extension)
    {
        string template = string.IsNullOrWhiteSpace(project.Report.FileName)
            ? DefaultTemplate
            : project.Report.FileName.Trim();
        extension = NormalizeExtension(extension);

        string date = now.ToString("yyyyMMdd");
        string dateTime = now.ToString("yyyyMMdd_HHmmss");
        string value = template
            .Replace("{ProjectName}", project.Name ?? "", StringComparison.OrdinalIgnoreCase)
            .Replace("{ProductName}", project.Dut.ProductName ?? "", StringComparison.OrdinalIgnoreCase)
            .Replace("{Model}", project.Dut.Model ?? "", StringComparison.OrdinalIgnoreCase)
            .Replace("{SerialNumber}", project.Dut.SerialNumber ?? "", StringComparison.OrdinalIgnoreCase)
            .Replace("{yyyyMMdd_HHmmss}", dateTime, StringComparison.OrdinalIgnoreCase)
            .Replace("{DateTime}", dateTime, StringComparison.OrdinalIgnoreCase)
            .Replace("{yyyyMMdd}", date, StringComparison.OrdinalIgnoreCase)
            .Replace("{Date}", date, StringComparison.OrdinalIgnoreCase);

        value = MakeSafeFileName(value);
        if (string.IsNullOrWhiteSpace(value))
            value = $"report_{dateTime}{extension}";
        value = Path.ChangeExtension(value, extension);

        return value;
    }

    public static ReportOutputFormat ParseFormat(string? value)
    {
        if (Enum.TryParse<ReportOutputFormat>(value, ignoreCase: true, out var format))
            return format;
        return ReportOutputFormat.Pdf;
    }

    public static IReadOnlyList<ReportFileDescriptor> EnumerateReportFiles(
        string? directory,
        ReportOutputFormat format)
    {
        if (string.IsNullOrWhiteSpace(directory) || !Directory.Exists(directory))
            return Array.Empty<ReportFileDescriptor>();

        string[] patterns = format switch
        {
            ReportOutputFormat.Word => new[] { "*.docx" },
            ReportOutputFormat.Both => new[] { "*.pdf", "*.docx" },
            _ => new[] { "*.pdf" }
        };

        return patterns
            .SelectMany(pattern => Directory.EnumerateFiles(directory, pattern, SearchOption.TopDirectoryOnly))
            .Select(path => new FileInfo(path))
            .OrderByDescending(file => file.LastWriteTime)
            .Select(file => new ReportFileDescriptor(
                file.FullName,
                file.Name,
                file.LastWriteTime,
                file.Extension.Equals(".pdf", StringComparison.OrdinalIgnoreCase)
                    ? ReportFileKind.Pdf
                    : ReportFileKind.Word))
            .ToArray();
    }

    public static IReadOnlyList<ReportFileDescriptor> EnumeratePdfFiles(string? directory)
    {
        return EnumerateReportFiles(directory, ReportOutputFormat.Pdf);
    }

    public static string BuildInfoPath(string outputPath) =>
        Path.Combine(
            Path.GetDirectoryName(outputPath) ?? "",
            Path.GetFileNameWithoutExtension(outputPath) + ".reportinfo.json");

    public static void SaveInfo(ReportInfo info, string infoPath)
    {
        Directory.CreateDirectory(Path.GetDirectoryName(infoPath)!);
        File.WriteAllText(infoPath, JsonSerializer.Serialize(info, JsonOptions));
    }

    public static ReportInfo? LoadInfoForReport(string reportPath)
    {
        string infoPath = BuildInfoPath(reportPath);
        if (!File.Exists(infoPath)) return null;
        return JsonSerializer.Deserialize<ReportInfo>(File.ReadAllText(infoPath), JsonOptions);
    }

    private static string MakeSafeFileName(string value)
    {
        var invalid = Path.GetInvalidFileNameChars();
        var chars = value
            .Select(c => invalid.Contains(c) ? '_' : c)
            .ToArray();
        return new string(chars).Trim(' ', '.');
    }

    private static string NormalizeExtension(string extension)
    {
        if (string.IsNullOrWhiteSpace(extension)) return ".pdf";
        extension = extension.Trim();
        return extension.StartsWith('.') ? extension : "." + extension;
    }
}

public enum ReportFileKind
{
    Pdf,
    Word
}

public sealed record ReportFileDescriptor(
    string FullPath,
    string DisplayName,
    DateTime LastWriteTime,
    ReportFileKind Kind = ReportFileKind.Pdf)
{
    public bool IsPdf => Kind == ReportFileKind.Pdf;
    public bool IsWord => Kind == ReportFileKind.Word;
}

public sealed class ReportInfo
{
    public string ProjectName { get; set; } = "";
    public string ProductName { get; set; } = "";
    public string Model { get; set; } = "";
    public string SerialNumber { get; set; } = "";
    public DateTime GeneratedAt { get; set; }
    public string Format { get; set; } = "";
    public string? PdfPath { get; set; }
    public string? WordPath { get; set; }
    public string OverallStatus { get; set; } = "";
    public ReportSectionInfo Sections { get; set; } = new();
}

public sealed class ReportSectionInfo
{
    public bool Cover { get; set; }
    public bool Basic { get; set; }
    public bool Curve { get; set; }
    public bool Power { get; set; }
    public bool Protect { get; set; }
}