using RolemasterDb.ImportTool.Parsing;

namespace RolemasterDb.ImportTool;

public sealed class CriticalImportCommandRunner
{
    private readonly CriticalImportManifestLoader manifestLoader = new();
    private readonly ImportArtifactWriter artifactWriter = new();
    private readonly PdfXmlExtractor pdfXmlExtractor = new();
    private readonly CriticalSourceImageArtifactGenerator sourceImageArtifactGenerator;
    private readonly StandardCriticalTableParser standardParser = new();
    private readonly VariantColumnCriticalTableParser variantColumnParser = new();
    private readonly GroupedVariantCriticalTableParser groupedVariantParser = new();

    public CriticalImportCommandRunner()
    {
        sourceImageArtifactGenerator = new CriticalSourceImageArtifactGenerator(pdfXmlExtractor);
    }

    public async Task<int> RunAsync(ResetOptions options)
    {
        if (!string.Equals(options.Target, "criticals", StringComparison.OrdinalIgnoreCase))
        {
            Console.Error.WriteLine("Only 'criticals' is supported by phase 1.");
            return 1;
        }

        var loader = new CriticalImportLoader(ResolveDatabasePath(options.DatabasePath));
        var removedTableCount = await loader.ResetCriticalsAsync();
        Console.WriteLine($"Removed {removedTableCount} critical table records.");
        return 0;
    }

    public async Task<int> RunAsync(ExtractOptions options)
    {
        var entry = GetManifestEntry(options.Table);
        var artifactPaths = CreateArtifactPaths(entry.Slug);
        await pdfXmlExtractor.ExtractAsync(ResolveRepositoryPath(entry.PdfPath), artifactPaths.XmlPath);
        Console.WriteLine($"Extracted {entry.Slug} to {artifactPaths.XmlPath}");
        return 0;
    }

    public async Task<int> RunAsync(LoadOptions options)
    {
        var entry = GetManifestEntry(options.Table);
        var artifactPaths = CreateArtifactPaths(entry.Slug);

        if (!File.Exists(artifactPaths.XmlPath))
        {
            Console.Error.WriteLine($"Missing XML artifact: {artifactPaths.XmlPath}");
            return 1;
        }

        var xmlContent = await File.ReadAllTextAsync(artifactPaths.XmlPath);
        var parseResult = Parse(entry, xmlContent);
        await sourceImageArtifactGenerator.GenerateAsync(
            ResolveRepositoryPath(entry.PdfPath),
            artifactPaths,
            parseResult,
            CancellationToken.None);
        await artifactWriter.WriteAsync(artifactPaths, parseResult, CancellationToken.None);

        if (!parseResult.ValidationReport.IsValid)
        {
            throw new InvalidOperationException(
                $"Validation failed for '{entry.Slug}'. See {artifactPaths.ValidationReportPath} for details.");
        }

        foreach (var warning in parseResult.ValidationReport.Warnings)
        {
            Console.WriteLine($"Warning: {warning}");
        }

        var loader = new CriticalImportLoader(ResolveDatabasePath(options.DatabasePath));
        var result = await loader.LoadAsync(parseResult.Table);

        Console.WriteLine(
            $"Loaded {result.TableSlug}: {result.ColumnCount} columns, {result.RollBandCount} roll bands, {result.ResultCount} results.");

        return 0;
    }

    public async Task<int> RunAsync(ImportOptions options)
    {
        var extractExitCode = await RunAsync(new ExtractOptions
        {
            DatabasePath = options.DatabasePath,
            Table = options.Table
        });

        if (extractExitCode != 0)
        {
            return extractExitCode;
        }

        return await RunAsync(new LoadOptions
        {
            DatabasePath = options.DatabasePath,
            Table = options.Table
        });
    }

    private CriticalImportManifestEntry GetManifestEntry(string tableSlug)
    {
        var manifest = manifestLoader.Load(RepositoryPaths.Discover().ManifestPath);
        return manifest.Tables
            .Where(item => item.Enabled)
            .SingleOrDefault(item => string.Equals(item.Slug, tableSlug.Trim(), StringComparison.OrdinalIgnoreCase))
            ?? throw new InvalidOperationException($"No enabled manifest entry was found for '{tableSlug}'.");
    }

    private CriticalTableParseResult Parse(CriticalImportManifestEntry entry, string xmlContent)
    {
        if (string.Equals(entry.Family, "standard", StringComparison.OrdinalIgnoreCase))
        {
            return standardParser.Parse(entry, xmlContent);
        }

        if (string.Equals(entry.Family, "variant_column", StringComparison.OrdinalIgnoreCase))
        {
            return variantColumnParser.Parse(entry, xmlContent);
        }

        if (string.Equals(entry.Family, "grouped_variant", StringComparison.OrdinalIgnoreCase))
        {
            return groupedVariantParser.Parse(entry, xmlContent);
        }

        throw new InvalidOperationException($"Family '{entry.Family}' is not supported by the importer.");
    }

    private static ImportArtifactPaths CreateArtifactPaths(string slug) =>
        ImportArtifactPaths.Create(RepositoryPaths.Discover().ArtifactsRootPath, slug);

    private static string ResolveDatabasePath(string? databasePath) =>
        Path.GetFullPath(databasePath ?? RepositoryPaths.Discover().DefaultDatabasePath);

    private static string ResolveRepositoryPath(string path) =>
        Path.GetFullPath(Path.Combine(RepositoryPaths.Discover().RootPath, path));
}