namespace FileExposer.Models;

using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Text.Json;
using System.Threading.Tasks;
using Microsoft.Extensions.FileSystemGlobbing;

public class SyncV1Repository(AppSettings appSettings) : ISyncV1Repository
{

    private readonly string _RepositoryName = nameof(SyncV1Repository)[..^10];
    private readonly AppSettings _AppSettings = appSettings;

    void ISyncV1Repository.Delete(string path, long size, long ticks)
    {
        FileInfo fileInfo = Verify(path, size, ticks);
        if (fileInfo.FullName != path)
            throw new Exception("Path must match!");
        File.Delete(path);
    }

    Get ISyncV1Repository.Get(string path, long? size, long? ticks)
    {
        Get result;
        if (string.IsNullOrEmpty(path))
            throw new Exception("Path mush be set!");
        if (size is not null && ticks is not null)
        {
            FileInfo fileInfo = Verify(path, size.Value, ticks.Value);
            result = new(JSON: null, Bytes: File.ReadAllBytes(fileInfo.FullName));
        }
        else
        {
            if (File.Exists(path))
                throw new Exception("Must pass size and ticks when passing a file!");
            string directory = Path.GetFullPath(path);
            string excludePatternsFile = Path.Combine(directory, _AppSettings.SyncConfiguration.ExcludePatternsFile);
            string includePatternsFile = Path.Combine(directory, _AppSettings.SyncConfiguration.IncludePatternsFile);
            Matcher matcher = GetMatcher(excludePatternsFile, includePatternsFile);
            ReadOnlyCollection<Record> records = Record.GetRecords(matcher, directory);
            RelativePath relativePath = new(LeftDirectory: path, Records: [.. records], RightDirectory: null);
            result = new(JSON: JsonSerializer.Serialize(relativePath, RelativePathSourceGenerationContext.Default.RelativePath), Bytes: null);
        }
        return result;
    }

    private static Matcher GetMatcher(string excludePatternsFile, string includePatternsFile)
    {
        Matcher result = new();
        result.AddIncludePatterns(!File.Exists(includePatternsFile) ? ["*"] : File.ReadAllLines(includePatternsFile));
        result.AddExcludePatterns(!File.Exists(excludePatternsFile) ? ["System Volume Information"] : File.ReadAllLines(excludePatternsFile));
        return result;
    }

    private FileInfo Verify(string path, long size, long ticks)
    {
        FileInfo fileInfo = new(path);
        if (fileInfo.Length != size)
            throw new Exception("Size must match!");
        TimeSpan timeSpan = new(fileInfo.LastWriteTime.ToUniversalTime().Ticks - ticks);
        if (Math.Abs(timeSpan.TotalSeconds) > _AppSettings.SyncConfiguration.SecondThreshold)
            throw new Exception("Ticks must be within the threshold!");
        return fileInfo;
    }

    string ISyncV1Repository.Post(Stream stream)
    {
        string result;
        RelativePath? relativePath = RelativePath.Get(stream) ??
            throw new MissingFieldException();
        string directory = Path.GetFullPath(relativePath.LeftDirectory);
        string excludePatternsFile = Path.Combine(directory, _AppSettings.SyncConfiguration.ExcludePatternsFile);
        string includePatternsFile = Path.Combine(directory, _AppSettings.SyncConfiguration.IncludePatternsFile);
        Matcher matcher = GetMatcher(excludePatternsFile, includePatternsFile);
        ReadOnlyCollection<Record> records = Record.GetRecords(matcher, directory);
        if (records.Count == 0)
            throw new Exception("No source records");
        Review review = Review.Get(relativePath, records);
        result = JsonSerializer.Serialize(review, ReviewSourceGenerationContext.Default.Review);
        return result;
    }

    void ISyncV1Repository.Patch(string path, string data, Stream stream)
    {
        string st = "d:/Tmp/phares/VisualStudioCode/z-include-patterns - Copy C.nsv";
        FileStream fileStream = new(st, FileMode.Truncate);
        Task task = stream.CopyToAsync(fileStream);
        task.Wait();
        fileStream.Dispose();
    }

    void ISyncV1Repository.Put(string path, string data, Stream stream)
    {
        string st = "d:/Tmp/phares/VisualStudioCode/z-include-patterns - Copy C.nsv";
        FileStream fileStream = new(st, FileMode.CreateNew);
        Task task = stream.CopyToAsync(fileStream);
        task.Wait();
        fileStream.Dispose();
    }

}