using Microsoft.Extensions.Logging;
using System.Collections.ObjectModel;
using System.Globalization;
using System.IO.Compression;

namespace File_Folder_Helper.Day;

internal static class Helper20231122
{

    private record Record(string File, string FileName, string Equipment, string TimeStamp);

    private static ReadOnlyCollection<Record> GetRecords(string sourceDirectory, string timestampFormat)
    {
        List<Record> results = [];
        Record record;
        string fileName;
        string equipment;
        string timestamp;
        string[] segments;
        string[] files = Directory.GetFiles(sourceDirectory, "*.pdsf", SearchOption.TopDirectoryOnly).ToArray();
        foreach (string file in files)
        {
            fileName = Path.GetFileName(file);
            segments = fileName.Split('_');
            if (segments.Length != 2)
                continue;
            equipment = segments[0];
            timestamp = segments[1].Split('.')[0];
            if (timestamp.Length != timestampFormat.Length)
                continue;
            record = new(file, fileName, equipment, timestamp);
            results.Add(record);
        }
        return new(results.OrderBy(l => l.TimeStamp).ToArray());
    }

    private static void WriteFile(string sourceDirectory, string[] columns, string equipment, List<List<string>> data, List<string> timestamps, string timestamp, DateTime dateTime)
    {
        List<string> lines = [];
        string checkFile = Path.Combine(sourceDirectory, $"{equipment}-{timestamp}.tvs");
        if (File.Exists(checkFile))
            throw new NotSupportedException();
        lines.Add($"timestamp\t{string.Join('\t', timestamps)}");
        for (int i = 0; i < columns.Length; i++)
            lines.Add($"{columns[i]}\t{string.Join('\t', data[i])}");
        File.WriteAllLines(checkFile, lines);
        File.SetLastWriteTime(checkFile, dateTime);
    }

    private static void ZipAndDeleteFiles(string sourceDirectory, string equipment, string timestamp, List<string> files, DateTime dateTime)
    {
        string checkFile = Path.Combine(sourceDirectory, $"{equipment}-{timestamp}.zip");
        if (File.Exists(checkFile))
            throw new NotSupportedException();
        using ZipArchive zip = ZipFile.Open(checkFile, ZipArchiveMode.Create);
        foreach (string file in files)
        {
            _ = zip.CreateEntryFromFile(file, Path.GetFileName(file));
            File.Delete(file);
        }
        File.SetLastWriteTime(checkFile, dateTime);
    }

    private static void MoveFilesBack(string sourceDirectory, string parsedDirectory, List<string> parsedFiles)
    {
        foreach (string parsedFile in parsedFiles)
            File.Move(parsedFile, Path.Combine(sourceDirectory, Path.GetFileName(parsedFile)));
        if (parsedFiles.Count > 0)
            Directory.Delete(parsedDirectory);
    }

    private static ReadOnlyDictionary<string, ReadOnlyCollection<Record>> GetEquipmentToRecords(string sourceDirectory, string timestampFormat)
    {
        Dictionary<string, ReadOnlyCollection<Record>> results = [];
        List<Record>? collection;
        Dictionary<string, List<Record>> keyValuePairs = [];
        ReadOnlyCollection<Record> records = GetRecords(sourceDirectory, timestampFormat);
        foreach (Record record in records)
        {
            if (!keyValuePairs.TryGetValue(record.Equipment, out collection))
            {
                keyValuePairs.Add(record.Equipment, []);
                if (!keyValuePairs.TryGetValue(record.Equipment, out collection))
                    throw new NotSupportedException();
            }
            collection.Add(record);
        }
        foreach (KeyValuePair<string, List<Record>> keyValuePair in keyValuePairs)
            results.Add(keyValuePair.Key, new(keyValuePair.Value));
        return new(results);
    }

    private static void ParseProcessDataStandardFormatRecords(ILogger<Worker> logger, string sourceDirectory, string timestampFormat, string keyColumn, string missingKeyDirectory, string parsedDirectory, ReadOnlyCollection<Record> records)
    {
        string[] lines;
        string[] values;
        string[] columns;
        DateTime dateTime;
        string parsedFile;
        int? keyColumnIndex;
        string keyColumnValue;
        string? lastColumn = null;
        List<List<string>> data = [];
        List<string> timestamps = [];
        List<string> parsedFiles = [];
        int? lastKeyColumnIndex = null;
        string? lastKeyColumnValue = null;
        foreach (Record record in records)
        {
            lines = File.ReadAllLines(record.File);
            if (lines.Length != 15)
                continue;
            if (lines[6].Length < 1 || lines[6][0] != '"' || !lines[6].StartsWith("\"Time\""))
                continue;
            if (lines[8].Length < 1 || lines[8][0] != 'N' || lines[8] != "NUM_DATA_ROWS\t000000001")
                continue;
            keyColumnIndex = null;
            columns = lines[6].Split('\t');
            if (columns.Length < 3)
                continue;
            values = lines[7].Split('\t');
            if (values.Length != columns.Length)
                continue;
            for (int i = 0; i < columns.Length; i++)
            {
                if (columns[i] != keyColumn)
                    continue;
                keyColumnIndex = i;
                break;
            }
            if (keyColumnIndex is null)
            {
                File.Move(record.File, Path.Combine(sourceDirectory, missingKeyDirectory, record.FileName));
                continue;
            }
            keyColumnValue = values[keyColumnIndex.Value];
            parsedFile = Path.Combine(parsedDirectory, record.FileName);
            if ((lastColumn is not null && lines[6] != lastColumn) || (lastKeyColumnIndex is not null && keyColumnIndex.Value != lastKeyColumnIndex.Value) || (lastKeyColumnValue is not null && lastKeyColumnValue != keyColumnValue) || timestamps.Count > 12345)
            {
                if (!DateTime.TryParseExact(record.TimeStamp, timestampFormat, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime))
                    throw new NotSupportedException();
                WriteFile(sourceDirectory, columns, record.Equipment, data, timestamps, record.TimeStamp, dateTime);
                ZipAndDeleteFiles(sourceDirectory, record.Equipment, record.TimeStamp, parsedFiles, dateTime);
                Directory.Delete(parsedDirectory);
                logger.LogInformation("{timestamp} triggered", record.TimeStamp);
                parsedFiles.Clear();
                break;
            }
            parsedFiles.Add(parsedFile);
            File.Move(record.File, parsedFile);
            timestamps.Add($"'{record.TimeStamp}");
            for (int i = 0; i < columns.Length; i++)
                data.Add([]);
            for (int i = 0; i < columns.Length; i++)
                data[i].Add(values[i]);
            lastColumn = lines[6];
            lastKeyColumnIndex = keyColumnIndex;
            lastKeyColumnValue = keyColumnValue;
        }
        MoveFilesBack(sourceDirectory, parsedDirectory, parsedFiles);
    }

    private static void ParseProcessDataStandardFormatFiles(ILogger<Worker> logger, string sourceDirectory, string timestampFormat, string keyColumn, string missingKeyDirectory)
    {
        string parsedDirectory;
        ReadOnlyDictionary<string, ReadOnlyCollection<Record>> equipmentToRecords = GetEquipmentToRecords(sourceDirectory, timestampFormat);
        foreach (KeyValuePair<string, ReadOnlyCollection<Record>> keyValuePair in equipmentToRecords)
        {
            parsedDirectory = Path.Combine(sourceDirectory, DateTime.Now.Ticks.ToString());
            if (!Directory.Exists(parsedDirectory))
                _ = Directory.CreateDirectory(parsedDirectory);
            ParseProcessDataStandardFormatRecords(logger, sourceDirectory, timestampFormat, keyColumn, missingKeyDirectory, parsedDirectory, keyValuePair.Value);
            Thread.Sleep(100);
        }
    }

    internal static void ProcessDataStandardFormat(ILogger<Worker> logger, List<string> args)
    {
        string keyColumn = args[3];
        string sourceDirectory = args[0];
        string timestampFormat = args[2];
        if (!Directory.Exists(sourceDirectory))
            throw new Exception(sourceDirectory);
        string missingKeyDirectory = Path.Combine(sourceDirectory, "Missing-Key");
        if (!Directory.Exists(missingKeyDirectory))
            _ = Directory.CreateDirectory(missingKeyDirectory);
        while (true)
        {
            ParseProcessDataStandardFormatFiles(logger, sourceDirectory, timestampFormat, keyColumn, missingKeyDirectory);
            Thread.Sleep(5000);
        }
    }

}