using System;
using System.Collections.Generic;

namespace Adaptation.FileHandlers.QS408M;

public class TXT
{

    public Header Header { get; set; }
    public Body Body { get; set; }
    public Footer Footer { get; set; }

    private int _I;
    private readonly string _Data;

    public TXT(string receivedData)
    {
        _I = 0;
        Site site;
        _Data = receivedData;
        List<Site> sites = new();
        string title = GetBefore("Recipe:");
        string recipe = GetToken();
        string dateTime = GetToEOL();
        if (dateTime.EndsWith("."))
            dateTime = dateTime.Remove(dateTime.Length - 1, 1);
        ScanPast("operator:");
        string @operator = GetBefore("batch:");
        string batch = GetToEOL();
        ScanPast("cassette:");
        if (!receivedData.Contains("cassette:"))
            title = string.Empty;
        string cassette = GetBefore("wafer:");
        if (string.IsNullOrEmpty(batch))
        {
            _I = 0;
            _Data = receivedData;
            ScanPast("wafer:");
        }
        string wafer = GetToEOL();
        _ = GetToEOL();
        _ = GetToEOL();
        if (string.IsNullOrEmpty(wafer))
            throw new Exception("Wafer field is missing.");
        string token = GetToken();
        while (true)
        {
            if (string.IsNullOrEmpty(token) || !char.IsDigit(token[0]))
                break;
            site = new()
            {
                Position = token,
                Thickness = GetToken(),
            };
            sites.Add(site);
            token = GetToken();
        }
        ScanPast("mean thickness =");
        string meanThickness = GetBefore(", std. dev =");
        string stdDev = GetToken();
        string passFail = GetToEOL();
        _ = GetToEOL();
        _ = GetToEOL();
        string line = GetToEOL();
        ScanPast("thickness");
        string radialVariationThickness = GetToEOL();
        _ = GetToEOL();
        ScanPast("Slot:");
        string slot = GetBefore(";");
        Header = new()
        {
            Title = title,
            Recipe = recipe,
            DateTime = dateTime,
            Operator = @operator,
            Batch = batch,
            Cassette = cassette,
            Wafer = wafer,
        };
        Body = new()
        {
            Sites = sites,
            WaferMeanThickness = meanThickness,
            StdDev = stdDev,
            PassFail = passFail,
        };
        Footer = new()
        {
            Line = line,
            RadialVariationThickness = radialVariationThickness,
            Slot = slot,
        };
    }

    private string GetBefore(string text)
    {
        string str;
        string str1;
        int num = _Data.IndexOf(text, _I);
        if (num <= -1)
        {
            str = _Data.Substring(_I);
            _I = _Data.Length;
            str1 = str.Trim();
        }
        else
        {
            str = _Data.Substring(_I, num - _I);
            _I = num + text.Length;
            str1 = str.Trim();
        }
        return str1;
    }

    private string GetToEOL()
    {
        string result;
        if (_Data.IndexOf("\n", _I) > -1)
            result = GetBefore("\n");
        else
            result = GetBefore(Environment.NewLine);
        return result;
    }

    private string GetToken()
    {
        while (true)
        {
            if (_I >= _Data.Length || !IsNullOrWhiteSpace(_Data.Substring(_I, 1)))
            {
                break;
            }
            _I++;
        }
        int num = _I;
        while (true)
        {
            if (num >= _Data.Length || IsNullOrWhiteSpace(_Data.Substring(num, 1)))
            {
                break;
            }
            num++;
        }
        string str = _Data.Substring(_I, num - _I);
        _I = num;
        return str.Trim();
    }

    private static bool IsNullOrWhiteSpace(string text)
    {
        bool flag;
        int num = 0;
        while (true)
        {
            if (num >= text.Length)
            {
                flag = true;
                break;
            }
            else if (char.IsWhiteSpace(text[num]))
            {
                num++;
            }
            else
            {
                flag = false;
                break;
            }
        }
        return flag;
    }

    private void ScanPast(string text)
    {
        int num = _Data.IndexOf(text, _I);
        if (num <= -1)
        {
            _I = _Data.Length;
        }
        else
        {
            _I = num + text.Length;
        }
    }

}

// Bio-Rad QS400MEPI        Recipe: EP_8IN9PT       Thu Apr 30 11:29:10 1970
// operator: J                     batch:     BIORAD#2            
// cassette:                       wafer:     52-589368-4445      
// --------------------------------------------------------------------------------
//    position thickness   position thickness   position thickness
//           1    45.735          2    46.536          3    46.742
//           4    46.015          5    46.648          6    45.366
//           7    46.263          8    46.512          9    46.373
//    wafer mean thickness =   46.2433, std. dev =    0.4564 PASS
// ================================================================================

// Radial variation (computation B) PASS:

//      thickness      -2.7474