using Kit.Helpers.SqlHelperAbstract;
using Microsoft.Extensions.Logging;
using Server.WatchBody.Core.Dal.Ref.Repository;
using Server.WatchBody.Core.Dal.Src.Repository;
using Server.WatchBody.Core.Programs;

namespace Server.WatchBody.Import;

/// <summary>
/// Обход Import.Dir (spec 04 m06): подпапки = имена атлетов; .fit/.tcx/
/// .gpx → WorkoutImporter, program-import.json → ProgramPackageImporter;
/// обработанные → ArchiveDir, сбойные остаются (🛡4 — пакет
/// продолжается).
/// </summary>
public class ImportService(IConnectionString connectionString, ILogger<ImportService>? logger = null)
{
    private static readonly string[] ActivityExtensions = [".fit", ".tcx", ".gpx"];
    private const string PackageName = "program-import.json";

    /// <summary>(обработано, сбойных). Каталог импорта не существует → (0, 0).</summary>
    public (int Processed, int Failed) Run(string importDir, string archiveDir)
    {
        if (!Directory.Exists(importDir))
        {
            Log($"каталог импорта {importDir} не существует — новых файлов нет");
            return (0, 0);
        }
        Directory.CreateDirectory(archiveDir);

        // имена атлетов могут повторяться (общая тестовая БД) — первый
        var athletes = new AthleteRepository(connectionString).Select(null)
            .GroupBy(a => a.Name, StringComparer.Ordinal)
            .ToDictionary(g => g.Key, g => g.First().Id, StringComparer.Ordinal);
        var importer = new ImportContext(connectionString);

        var processed = 0;
        var failed = 0;
        foreach (var folder in Directory.GetDirectories(importDir))
        {
            var athleteName = Path.GetFileName(folder);
            if (!athletes.TryGetValue(athleteName, out var athleteId))
            {
                failed++;
                Log($"атлет '{athleteName}' не найден — файлы папки не обработаны");
                continue;
            }
            foreach (var file in Directory.GetFiles(folder))
            {
                var name = Path.GetFileName(file);
                try
                {
                    ProcessFile(importer, athleteId, file, athleteName);
                    var target = ArchivePath(archiveDir, athleteName, name);
                    Directory.CreateDirectory(Path.GetDirectoryName(target)!);
                    System.IO.File.Move(file, target);
                    processed++;
                    Log($"обработан: {athleteName}/{name}");
                }
                catch (Exception e)
                {
                    failed++;
                    Log($"СБОЙ {athleteName}/{name}: {e.Message}");
                    Console.Error.WriteLine($"import error: {athleteName}/{name}: {e}");
                }
            }
        }
        foreach (var file in Directory.GetFiles(importDir))
            Log($"пропущен (не в подпапке-атлете): {Path.GetFileName(file)}");
        return (processed, failed);
    }

    private static void ProcessFile(ImportContext ctx, int athleteId, string path, string athleteName)
    {
        var extension = Path.GetExtension(path).ToLowerInvariant();
        var name = Path.GetFileName(path);
        switch (extension)
        {
            case ".fit":
                ctx.Workouts.Import(athleteId, ctx.Fit.Parse(path));
                break;
            case ".tcx" or ".gpx":
                ctx.Workouts.Import(athleteId, ctx.Xml.Parse(path));
                break;
            case ".json" when name.Equals(PackageName, StringComparison.OrdinalIgnoreCase):
                ctx.Packages.Import(athleteId, System.IO.File.ReadAllText(path));
                break;
            default:
                throw new FitParseException($"неизвестный тип файла импорта: {name}");
        }
    }

    private static string ArchivePath(string archiveDir, string athleteName, string fileName)
    {
        var target = Path.Combine(archiveDir, athleteName, fileName);
        if (!System.IO.File.Exists(target)) return target;
        var suffix = $"-{DateTime.Now:HHmmss}";
        return Path.Combine(archiveDir, athleteName,
            Path.GetFileNameWithoutExtension(fileName) + suffix + Path.GetExtension(fileName));
    }

    private void Log(string message) => logger?.LogInformation("{Message}", message);

    /// <summary>Ленивые зависимости одного прогона (соединение общее).</summary>
    private sealed class ImportContext(IConnectionString cs)
    {
        public readonly FitParser Fit = new();
        public readonly TcxGpxParser Xml = new();
        public readonly WorkoutImporter Workouts = new(
            new WorkoutRepository(cs));
        public readonly ProgramPackageImporter Packages = new(
            new ProgramRepository(cs), new ExerciseRepository(cs),
            new ExerciseGroupRepository(cs),
            new ProgramStore(new ProgramRepository(cs), new ProgramVersionRepository(cs)));
    }
}