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

namespace File_Folder_Helper.Day;

internal static class Helper20231130
{

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

    private static ReadOnlyDictionary<string, string> GetSystemStates()
    {
        Dictionary<string, string> results = [];
        results.Add("1", "cold-idle");
        results.Add("2", "running");
        results.Add("3", "run-wafer");
        results.Add("4", "warm-idle");
        results.Add("5", "pause");
        results.Add("6", "suspend");
        results.Add("7", "startup");
        results.Add("8", "shutdown");
        results.Add("9", "abort");
        results.Add("10", "safety-1");
        results.Add("11", "safety-2");
        results.Add("12", "safety-3");
        return new(results);
    }

    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());
    }

    internal static void RenameReactorProcessDataStandardFormatFiles(ILogger<Worker> logger, List<string> args)
    {
        string line;
        string[] lines;
        string[] values;
        string[] columns;
        DateTime dateTime;
        int? keyColumnIndex;
        string? systemState;
        string checkFileName;
        string keyColumnValue;
        string? lastColumn = null;
        List<string> allLines = [];
        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);
        ReadOnlyDictionary<string, string> systemStates = GetSystemStates();
        ReadOnlyCollection<Record> records = GetRecords(sourceDirectory, timestampFormat);
        foreach (Record record in records)
        {
            lines = File.ReadAllLines(record.File);
            if (lines.Length < 8)
                continue;
            if (lines[6].Length < 1 || lines[6][0] != '"' || !lines[6].StartsWith("\"Time\""))
                continue;
            if (lastColumn is not null && lines[6] != lastColumn)
                break;
            keyColumnIndex = null;
            lastColumn = lines[6];
            if (allLines.Count == 0)
                allLines.Add($"\"Timestamp\"\t{lastColumn}");
            columns = lines[6].Split('\t');
            if (columns.Length < 3)
                continue;
            values = lines[7].Split('\t');
            if (values.Length != columns.Length)
                continue;
            for (int i = 0; i < columns.Length; i++)
            {
                if (columns[i] != keyColumn)
                    continue;
                keyColumnIndex = i;
                break;
            }
            if (keyColumnIndex is null)
            {
                File.Move(record.File, Path.Combine(sourceDirectory, missingKeyDirectory, record.FileName));
                continue;
            }
            for (int i = 7; i < lines.Length; i++)
            {
                line = lines[i];
                if (line.Length < 1 || line[0] == 'N' && line.StartsWith("NUM_DATA_ROWS\t"))
                    break;
                allLines.Add($"'{record.TimeStamp}\t{line}");
            }
            keyColumnValue = values[keyColumnIndex.Value];
            logger.LogInformation("{timestamp} triggered", record.TimeStamp);
            if (!systemStates.TryGetValue(keyColumnValue, out systemState))
                continue;
            checkFileName = Path.Combine(Path.GetDirectoryName(record.File) ?? throw new Exception(), $"{record.Equipment}-{record.TimeStamp}-{systemState}.pdsf");
            File.Move(record.File, checkFileName);
            if (DateTime.TryParseExact(record.TimeStamp, timestampFormat, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime))
                File.SetLastWriteTime(checkFileName, dateTime);
        }
        File.WriteAllLines(Path.Combine(sourceDirectory, $"{DateTime.Now.Ticks}.tsv"), allLines);
    }

}