/*
 * DynamORM - Dynamic Object-Relational Mapping library.
 * Copyright (c) 2012-2026, Grzegorz Russek (grzegorz.russek@gmail.com)
 * All rights reserved.
 */

using System;
using System.Collections.Generic;
using System.Data;

namespace DynamORM.Tests.Helpers
{
    internal sealed class FakeMultiResultDataReader : IDataReader
    {
        private sealed class ResultSet
        {
            public string[] Names;
            public Type[] Types;
            public object[][] Rows;
        }

        private readonly List<ResultSet> _sets = new List<ResultSet>();
        private int _setIndex;
        private int _rowIndex = -1;

        public FakeMultiResultDataReader(params Tuple<string[], Type[], object[][]>[] sets)
        {
            foreach (var set in sets)
                _sets.Add(new ResultSet
                {
                    Names = set.Item1,
                    Types = set.Item2,
                    Rows = set.Item3
                });
        }

        private ResultSet Current { get { return _sets[_setIndex]; } }

        public object this[string name] { get { return GetValue(GetOrdinal(name)); } }
        public object this[int i] { get { return GetValue(i); } }
        public int Depth { get { return 0; } }
        public bool IsClosed { get; private set; }
        public int RecordsAffected { get { return 0; } }
        public int FieldCount { get { return Current.Names.Length; } }

        public void Close() { IsClosed = true; }
        public void Dispose() { Close(); }
        public bool GetBoolean(int i) { return (bool)GetValue(i); }
        public byte GetByte(int i) { return (byte)GetValue(i); }
        public long GetBytes(int i, long fieldOffset, byte[] buffer, int bufferoffset, int length) { throw new NotSupportedException(); }
        public char GetChar(int i) { return (char)GetValue(i); }
        public long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, int length) { throw new NotSupportedException(); }
        public IDataReader GetData(int i) { throw new NotSupportedException(); }
        public string GetDataTypeName(int i) { return GetFieldType(i).Name; }
        public DateTime GetDateTime(int i) { return (DateTime)GetValue(i); }
        public decimal GetDecimal(int i) { return (decimal)GetValue(i); }
        public double GetDouble(int i) { return (double)GetValue(i); }
        public Type GetFieldType(int i) { return Current.Types[i]; }
        public float GetFloat(int i) { return (float)GetValue(i); }
        public Guid GetGuid(int i) { return (Guid)GetValue(i); }
        public short GetInt16(int i) { return Convert.ToInt16(GetValue(i)); }
        public int GetInt32(int i) { return Convert.ToInt32(GetValue(i)); }
        public long GetInt64(int i) { return Convert.ToInt64(GetValue(i)); }
        public string GetName(int i) { return Current.Names[i]; }
        public int GetOrdinal(string name)
        {
            for (int i = 0; i < Current.Names.Length; i++)
                if (string.Equals(Current.Names[i], name, StringComparison.OrdinalIgnoreCase))
                    return i;
            return -1;
        }
        public DataTable GetSchemaTable()
        {
            DataTable schema = new DataTable();
            schema.Columns.Add("ColumnName", typeof(string));
            schema.Columns.Add("ColumnOrdinal", typeof(int));
            schema.Columns.Add("ColumnSize", typeof(int));
            schema.Columns.Add("NumericPrecision", typeof(short));
            schema.Columns.Add("NumericScale", typeof(short));
            schema.Columns.Add("DataType", typeof(Type));
            schema.Columns.Add("ProviderType", typeof(int));
            schema.Columns.Add("NativeType", typeof(int));
            schema.Columns.Add("AllowDBNull", typeof(bool));
            schema.Columns.Add("IsUnique", typeof(bool));
            schema.Columns.Add("IsKey", typeof(bool));
            schema.Columns.Add("IsAutoIncrement", typeof(bool));

            for (int i = 0; i < Current.Names.Length; i++)
            {
                DataRow row = schema.NewRow();
                row[0] = Current.Names[i];
                row[1] = i;
                row[2] = 0;
                row[3] = 0;
                row[4] = 0;
                row[5] = Current.Types[i];
                row[6] = 0;
                row[7] = 0;
                row[8] = true;
                row[9] = false;
                row[10] = false;
                row[11] = false;
                schema.Rows.Add(row);
            }

            return schema;
        }
        public string GetString(int i) { return (string)GetValue(i); }
        public object GetValue(int i) { return Current.Rows[_rowIndex][i]; }
        public int GetValues(object[] values)
        {
            int count = Math.Min(values.Length, FieldCount);
            for (int i = 0; i < count; i++)
                values[i] = GetValue(i);
            return count;
        }
        public bool IsDBNull(int i) { return GetValue(i) == null || GetValue(i) == DBNull.Value; }
        public bool NextResult()
        {
            if (_setIndex + 1 >= _sets.Count)
                return false;

            _setIndex++;
            _rowIndex = -1;
            return true;
        }
        public bool Read()
        {
            if (_rowIndex + 1 >= Current.Rows.Length)
                return false;
            _rowIndex++;
            return true;
        }
    }
}