using System;
using System.Collections.Generic;
using System.IO;

namespace Server.Multis
{
  public class ComponentVerification
  {
    private int[] m_ItemTable;
    private int[] m_MultiTable;

    public ComponentVerification()
    {
      m_ItemTable = CreateTable(TileData.MaxItemValue);
      m_MultiTable = CreateTable(0x4000);

      LoadItems("Data/Components/walls.txt", "South1", "South2", "South3", "Corner", "East1", "East2", "East3", "Post",
        "WindowS", "AltWindowS", "WindowE", "AltWindowE", "SecondAltWindowS", "SecondAltWindowE");
      LoadItems("Data/Components/teleprts.txt", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "F10", "F11",
        "F12", "F13", "F14", "F15", "F16");
      LoadItems("Data/Components/stairs.txt", "Block", "North", "East", "South", "West", "Squared1", "Squared2",
        "Rounded1", "Rounded2");
      LoadItems("Data/Components/roof.txt", "North", "East", "South", "West", "NSCrosspiece", "EWCrosspiece", "NDent",
        "EDent", "SDent", "WDent", "NTPiece", "ETPiece", "STPiece", "WTPiece", "XPiece", "Extra Piece");
      LoadItems("Data/Components/floors.txt", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "F10", "F11",
        "F12", "F13", "F14", "F15", "F16");
      LoadItems("Data/Components/misc.txt", "Piece1", "Piece2", "Piece3", "Piece4", "Piece5", "Piece6", "Piece7",
        "Piece8");
      LoadItems("Data/Components/doors.txt", "Piece1", "Piece2", "Piece3", "Piece4", "Piece5", "Piece6", "Piece7",
        "Piece8");

      LoadMultis("Data/Components/stairs.txt", "MultiNorth", "MultiEast", "MultiSouth", "MultiWest");
    }

    public bool IsItemValid(int itemID) => itemID > 0 && itemID < m_ItemTable.Length && CheckValidity(m_ItemTable[itemID]);

    public bool IsMultiValid(int multiID) => multiID > 0 && multiID < m_MultiTable.Length && CheckValidity(m_MultiTable[multiID]);

    public bool CheckValidity(int val) => val != -1 && (val == 0 || ((int)ExpansionInfo.CoreExpansion.CustomHousingFlag & val) != 0);

    private int[] CreateTable(int length)
    {
      int[] table = new int[length];

      for (int i = 0; i < table.Length; ++i)
        table[i] = -1;

      return table;
    }

    private void LoadItems(string path, params string[] itemColumns)
    {
      LoadSpreadsheet(m_ItemTable, path, itemColumns);
    }

    private void LoadMultis(string path, params string[] multiColumns)
    {
      LoadSpreadsheet(m_MultiTable, path, multiColumns);
    }

    private void LoadSpreadsheet(int[] table, string path, params string[] tileColumns)
    {
      Spreadsheet ss = new Spreadsheet(path);

      int[] tileCIDs = new int[tileColumns.Length];

      for (int i = 0; i < tileColumns.Length; ++i)
        tileCIDs[i] = ss.GetColumnID(tileColumns[i]);

      int featureCID = ss.GetColumnID("FeatureMask");

      for (int i = 0; i < ss.Records.Length; ++i)
      {
        DataRecord record = ss.Records[i];

        int fid = record.GetInt32(featureCID);

        for (int j = 0; j < tileCIDs.Length; ++j)
        {
          int itemID = record.GetInt32(tileCIDs[j]);

          if (itemID <= 0 || itemID >= table.Length)
            continue;

          table[itemID] = fid;
        }
      }
    }
  }

  public class Spreadsheet
  {
    private ColumnInfo[] m_Columns;

    public Spreadsheet(string path)
    {
      using StreamReader ip = new StreamReader(path);
      string[] types = ReadLine(ip);
      string[] names = ReadLine(ip);

      m_Columns = new ColumnInfo[types.Length];

      for (int i = 0; i < m_Columns.Length; ++i)
        m_Columns[i] = new ColumnInfo(i, types[i], names[i]);

      List<DataRecord> records = new List<DataRecord>();

      string[] values;

      while ((values = ReadLine(ip)) != null)
      {
        object[] data = new object[m_Columns.Length];

        for (int i = 0; i < m_Columns.Length; ++i)
        {
          ColumnInfo ci = m_Columns[i];

          switch (ci.m_Type)
          {
            case "int":
            {
              data[i] = Utility.ToInt32(values[ci.m_DataIndex]);
              break;
            }
            case "string":
            {
              data[i] = values[ci.m_DataIndex];
              break;
            }
          }
        }

        records.Add(new DataRecord(this, data));
      }

      Records = records.ToArray();
    }

    public DataRecord[] Records{ get; }

    public int GetColumnID(string name)
    {
      for (int i = 0; i < m_Columns.Length; ++i)
        if (m_Columns[i].m_Name == name)
          return i;

      return -1;
    }

    private string[] ReadLine(StreamReader ip)
    {
      string line;

      while ((line = ip.ReadLine()) != null)
        if (line.Length > 0)
          return line.Split('\t');

      return null;
    }

    private class ColumnInfo
    {
      public int m_DataIndex;
      public string m_Name;

      public string m_Type;

      public ColumnInfo(int dataIndex, string type, string name)
      {
        m_DataIndex = dataIndex;

        m_Type = type;
        m_Name = name;
      }
    }
  }

  public class DataRecord
  {
    public DataRecord(Spreadsheet ss, object[] data)
    {
      Spreadsheet = ss;
      Data = data;
    }

    public Spreadsheet Spreadsheet{ get; }

    public object[] Data{ get; }

    public object this[string name] => this[Spreadsheet.GetColumnID(name)];

    public object this[int id] => id < 0 ? null : Data[id];

    public int GetInt32(string name) => GetInt32(this[name]);

    public int GetInt32(int id) => GetInt32(this[id]);

    public int GetInt32(object obj) => Convert.ToInt32(obj);

    public string GetString(string name) => this[name] as string;
  }
}