using Microsoft.Extensions.Logging;

namespace File_Folder_Helper.ADO2025.PI5;

internal static partial class Helper20250306 {

    internal static void ProcessDataStandardFormatToJson(ILogger<Worker> logger, List<string> args) {
        string searchPattern = args[2];
        string sourceDirectory = Path.GetFullPath(args[0]);
        string[] files = Directory.GetFiles(sourceDirectory, searchPattern, SearchOption.AllDirectories);
        if (files.Length != 1)
            logger.LogWarning("<{files}>(s)", files.Length);
        else
            ProcessDataStandardFormatToJson(logger, files[0]);
    }

    private static void ProcessDataStandardFormatToJson(ILogger<Worker> logger, string file) {
        string[] lines = File.ReadAllLines(file);
        int? columnTitlesLine = GetProcessDataStandardFormatColumnTitlesLine(lines);
        if (columnTitlesLine is null)
            logger.LogWarning("<{columnTitlesLine}> is null", nameof(columnTitlesLine));
        else {
            string? text = ProcessDataStandardFormatToLastDataLine(lines, columnTitlesLine.Value);
            File.WriteAllText(".lbl", text);
            if (lines.Length < columnTitlesLine.Value + 1)
                logger.LogWarning("<{lines}>(s)", lines.Length);
            else {
                string json = ProcessDataStandardFormatToJson(columnTitlesLine.Value, [], lines);
                File.WriteAllText(".json", json);
            }
        }
    }

    private static int? GetProcessDataStandardFormatColumnTitlesLine(string[] lines) {
        int? result = null;
        for (int i = 0; i < lines.Length; i++) {
            if (lines[i].StartsWith("END_OFFSET") && i + 2 < lines.Length) {
                result = i + 1;
                break;
            }
        }
        return result;
    }

    private static string? ProcessDataStandardFormatToLastDataLine(string[] lines, int columnTitlesLine) {
        string? result = null;
        for (int i = columnTitlesLine + 1; i < lines.Length; i++) {
            if (lines[i].StartsWith("NUM_DATA_ROWS")) {
                result = lines[i - 1];
                break;
            }
        }
        return result;
    }

    private static string ProcessDataStandardFormatToJson(int columnTitlesLine, string[] columns, string[] lines) {
#pragma warning disable CA1845, IDE0057
        string result = "[\n";
        string line;
        string value;
        string[] segments;
        if (columns.Length == 0)
            columns = lines[columnTitlesLine].Trim().Split('\t');
        for (int i = columnTitlesLine + 1; i < lines.Length; i++) {
            line = "{";
            segments = lines[i].Trim().Split('\t');
            if (segments.Length != columns.Length)
                break;
            for (int c = 1; c < segments.Length; c++) {
                value = segments[c].Replace("\"", "\\\"").Replace("\\", "\\\\");
                line += '"' + columns[c].Trim('"') + '"' + ':' + '"' + value + '"' + ',';
            }
            line = line.Substring(0, line.Length - 1) + '}' + ',' + '\n';
            result += line;
        }
        result = result.Substring(0, result.Length - 1) + ']';
        return result;
#pragma warning restore CA1845, IDE0057
    }

}