using System.Collections.ObjectModel;
using System.Globalization;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Text.RegularExpressions;

using Microsoft.Extensions.Logging;

namespace File_Folder_Helper.ADO2025.PI6;

internal static partial class Helper20250521 {

    [GeneratedRegex(@"[~\-,.0-9]")]
    private static partial Regex Number();

    [GeneratedRegex(@"[^\u0020-\u007E]")]
    private static partial Regex ASCII();

    private record Record(string Directory, string FileNameWithoutExtension);

    private record LineCheck(string[] Segments, DateTime TransactionDate, DateTime EffectiveDate) {

        internal static LineCheck Get(int dateLineSegmentCount, string datePattern, string line) {
            LineCheck result;
            string[] segments = line.Split(' ');
            if (segments.Length >= dateLineSegmentCount
                && segments[0].Length == datePattern.Length
                && segments[1].Length == datePattern.Length
                && DateTime.TryParseExact(segments[0], datePattern, CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime transactionDate)
                && DateTime.TryParseExact(segments[1], datePattern, CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime effectiveDate)) {
                result = new(Segments: segments, TransactionDate: transactionDate, EffectiveDate: effectiveDate);
            } else {
                result = new(Segments: segments, TransactionDate: DateTime.MinValue, EffectiveDate: DateTime.MinValue);
            }
            return result;
        }
    }

    private record RecordB(int I,
                           DateTime TransactionDate,
                           DateTime EffectiveDate,
                           string Description,
                           decimal WithdrawalOrDeposit,
                           decimal Balance);

    [JsonSourceGenerationOptions(WriteIndented = true)]
    [JsonSerializable(typeof(RecordB[]))]
    private partial class Helper20250521RecordB : JsonSerializerContext {
    }

    internal static void MatchDirectory(ILogger<Worker> logger, List<string> args) {
        Record record;
        string datePattern = args[5];
        string searchPattern = args[2];
        string searchPatternB = args[3];
        string columns = args[6].Replace('~', ',');
        int dateLineSegmentCount = int.Parse(args[4]);
        string sourceDirectory = Path.GetFullPath(args[0].Split('~')[0]);
        ReadOnlyDictionary<string, string> keyValuePairs = GetKeyValuePairs(searchPattern, sourceDirectory);
        MoveMatchDirectory(searchPatternB, keyValuePairs, sourceDirectory);
        ReadOnlyCollection<RecordB> records = GetRecords(searchPatternB, sourceDirectory, dateLineSegmentCount, datePattern, columns);
        WriteRecords(sourceDirectory, records);
    }

    private static ReadOnlyDictionary<string, string> GetKeyValuePairs(string searchPattern, string sourceDirectory) {
        Dictionary<string, string> results = [];
        string[] files = Directory.GetFiles(sourceDirectory, searchPattern, SearchOption.AllDirectories);
        foreach (string file in files) {
            results.Add(Path.GetFileNameWithoutExtension(file), Path.GetDirectoryName(file));
        }
        return results.AsReadOnly();
    }

    private static void MoveMatchDirectory(string searchPatternB, ReadOnlyDictionary<string, string> keyValuePairs, string sourceDirectory) {
        string checkFile;
        string fileNameWithoutExtension;
        string[] files = Directory.GetFiles(sourceDirectory, searchPatternB, SearchOption.AllDirectories);
        foreach (string file in files) {
            fileNameWithoutExtension = Path.GetFileNameWithoutExtension(file);
            if (!keyValuePairs.TryGetValue(fileNameWithoutExtension, out string? match))
                continue;
            checkFile = Path.Combine(match, Path.GetFileName(file));
            if (File.Exists(checkFile))
                continue;
            File.Move(file, checkFile);
        }
    }

    private static ReadOnlyCollection<RecordB> GetRecords(string searchPatternB, string sourceDirectory, int dateLineSegmentCount, string datePattern, string columns) {
        List<RecordB> results = [];
        string line;
        string[] lines;
        RecordB? record;
        LineCheck lineCheck;
        string[] files = Directory.GetFiles(sourceDirectory, searchPatternB, SearchOption.AllDirectories);
        foreach (string file in files) {
            lines = File.ReadAllLines(file);
            for (int i = 0; i < lines.Length; i++) {
                line = lines[i];
                if (string.IsNullOrEmpty(line)) {
                    continue;
                }
                lineCheck = LineCheck.Get(dateLineSegmentCount, datePattern, line);
                if (lineCheck.EffectiveDate == DateTime.MinValue || lineCheck.TransactionDate == DateTime.MinValue) {
                    continue;
                } else {
                    record = GetRecord(dateLineSegmentCount, datePattern, lines, i, lineCheck.Segments, lineCheck.TransactionDate, lineCheck.EffectiveDate);
                    if (record is not null) {
                        i = record.I;
                        results.Add(record);
                    }
                }
            }
        }
        return results.AsReadOnly();
    }

    private static RecordB? GetRecord(int dateLineSegmentCount, string datePattern, string[] lines, int i, string[] segments, DateTime transactionDate, DateTime effectiveDate) {
        RecordB? result = null;
        string line;
        RecordB record;
        LineCheck lineCheck;
        List<string> collection = [];
        for (int j = i + 1; j < lines.Length; j++) {
            line = lines[j];
            if (string.IsNullOrEmpty(line)) {
                continue;
            }
            lineCheck = LineCheck.Get(dateLineSegmentCount, datePattern, line);
            if (lineCheck.EffectiveDate == DateTime.MinValue || lineCheck.TransactionDate == DateTime.MinValue) {
                collection.Add(line);
            } else {
                if (lineCheck.Segments.Length > dateLineSegmentCount) {
                    collection.Insert(0, string.Join(' ', lineCheck.Segments.Skip(2)));
                }
                result = GetRecord(transactionDate, effectiveDate, collection.AsReadOnly(), j - 1);
                break;
            }
        }
        if (result is null && collection.Count > 0) {
            result = GetRecord(transactionDate, effectiveDate, collection.AsReadOnly(), lines.Length - 1);
        }
        return result;
    }

    private static RecordB GetRecord(DateTime transactionDate, DateTime effectiveDate, ReadOnlyCollection<string> collection, int i) {
        RecordB? result;
        List<string> verified = [];
        foreach (string check in collection) {
            if (Number().Replace(check, string.Empty).Length != 0) {
                verified.Clear();
            } else {
                verified.Add(check);
            }
            if (verified.Count == 2) {
                break;
            }
        }
        if (verified.Count != 2) {
            result = null;
        } else {
            decimal balance = decimal.Parse(verified[^1]);
            decimal withdrawalOrDeposit = decimal.Parse(verified[^2]);
            string description = ASCII().Replace(string.Join(' ', collection.SkipLast(2)), string.Empty);
            result = new(I: i,
                         TransactionDate: transactionDate,
                         EffectiveDate: effectiveDate,
                         Description: description,
                         WithdrawalOrDeposit: withdrawalOrDeposit,
                         Balance: balance);
        }
        return result;
    }

    private static void WriteRecords(string sourceDirectory, ReadOnlyCollection<RecordB> records) {
        string json = JsonSerializer.Serialize(records.ToArray(), Helper20250521RecordB.Default.RecordBArray);
        string sourceDirectoryVsCode = Path.Combine(sourceDirectory, ".vscode");
        if (!Directory.Exists(sourceDirectoryVsCode))
            _ = Directory.CreateDirectory(sourceDirectoryVsCode);
        File.WriteAllText(Path.Combine(sourceDirectoryVsCode, $"{DateTime.Now.Ticks}.json"), json);
    }

}