using Mirle.Component.MPLC.DataBlocks.DeviceRange.Interfaces;
using System;
using System.Diagnostics;
using System.Globalization;

namespace Mirle.Component.MPLC.DataBlocks.DeviceRange
{
    /// <summary>
    /// B 設備範圍
    /// </summary>
    public class BDeviceRange : ITypeDeviceRange
    {
        /// <summary>
        /// 建構式
        /// </summary>
        /// <param name="startAddress">起始位置</param>
        /// <param name="endAddress">結束位置</param>
        /// <exception cref="ArgumentException"></exception>
        public BDeviceRange(string startAddress, string endAddress)
        {
            StartAddress = startAddress;
            EndAddress = endAddress;
            if (!startAddress.StartsWith(_type) || !endAddress.StartsWith(_type))
                throw new ArgumentException("Wrong Type!!");

            try
            {
                _startOffset = int.Parse(startAddress[1..], NumberStyles.HexNumber);    //Hexadecimal
                _endOffset = int.Parse(endAddress[1..], NumberStyles.HexNumber);        //Hexadecimal
            }
            catch (Exception ex)
            {
                Debug.WriteLine($"{ex}");
                throw new ArgumentException("Wrong Address!!");
            }

            if (_startOffset > _endOffset)
                throw new ArgumentException("Wrong Address Range!!");
            int length = _endOffset - _startOffset + 1;
            WordLength = length % 16 == 0 ? length / 16 : length / 16 + 1;
        }
        /// <summary>
        /// 設備類別
        /// </summary>
        private const string _type = nameof(DeviceType.B);
        /// <summary>
        /// 起始偏移量
        /// </summary>
        private readonly int _startOffset;
        /// <summary>
        /// 結束偏移量
        /// </summary>
        private readonly int _endOffset;
        /// <summary>
        /// 起始位置
        /// </summary>
        public string StartAddress { get; }
        /// <summary>
        /// 結束位置
        /// </summary>
        public string EndAddress { get; }
        /// <summary>
        /// 字元長度
        /// </summary>
        public int WordLength { get; }
        /// <summary>
        /// 位元組陣列長度
        /// </summary>
        /// <value>WordLength * 2</value>
        public int ByteArrayLength => WordLength * 2;
        /// <summary>
        /// 是否為同樣設備範圍
        /// </summary>
        /// <param name="address">起始位置</param>
        /// <returns>True/False</returns>
        public bool IsSameRange(string address)
        {
            return TryGetIndex(address, out _);
        }
        /// <summary>
        /// 是否為同樣設備類別
        /// </summary>
        /// <param name="address">位置</param>
        /// <returns>True/False</returns>
        private static bool IsSameType(string address)
        {
            return address.ToUpper().StartsWith(_type);
        }
        /// <summary>
        /// 取得索引
        /// </summary>
        /// <param name="address">位置</param>
        /// <param name="index">索引</param>
        /// <returns>True/False</returns>
        public bool TryGetIndex(string address, out int index)
        {
            if (!IsSameType(address))
            {
                index = -1;
                return false;
            }

            address = address[1..];
            address = address.Split('.')[0];
            index = int.Parse(address, NumberStyles.HexNumber);
            if (index >= _startOffset && index <= _endOffset)
                return true;

            index = -1;
            return false;
        }
        /// <summary>
        /// 取得偏移量
        /// </summary>
        /// <param name="address">位置</param>
        /// <param name="offset">偏移量</param>
        /// <returns>True/False</returns>
        public bool TryGetOffset(string address, out int offset)
        {
            if (TryGetIndex(address, out int index))
            {
                offset = index - _startOffset;
                return true;
            }
            offset = -1;
            return false;
        }
        /// <summary>
        /// 取得位元組陣列偏移量
        /// </summary>
        /// <param name="address">位置</param>
        /// <param name="offset">偏移量</param>
        /// <returns>True/False</returns>
        public bool TryGetByteArrayOffset(string address, out int offset)
        {
            if (TryGetIndex(address, out int index))
            {
                offset = (index - _startOffset) / 16 * 2;
                return true;
            }
            offset = -1;
            return false;
        }
        /// <summary>
        /// 取得位元組陣列位元索引
        /// </summary>
        /// <param name="address">位置</param>
        /// <param name="index">索引</param>
        /// <returns>True/False</returns>
        public bool TryGetByteArrayBitIndex(string address, out int index)
        {
            if (TryGetIndex(address, out int bitIndex))
            {
                index = (bitIndex - _startOffset) % 16;
                return true;
            }
            index = -1;
            return false;
        }
    }
}