/// 112 年工科賽第 4 題
/// 多台無人機操控系統
/// 漆家豪 於海青資訊科 2024/2/8
using System;
using System.IO;
using System.Text;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace DroneControl
{
    public struct Coordinate
    {
        public static readonly Coordinate MAX = new Coordinate(50, 50);//最大範圍坐標
        public static readonly string NESW = "NESW";
        public static readonly Coordinate[] dDirection = new Coordinate[4]//坐標偏移量
        {
            new Coordinate(0 , 1), //北方向
            new Coordinate(1 , 0), //東方向
            new Coordinate(0 ,-1), //南方向
            new Coordinate(-1, 0)  //西方向
        };
        public int x, y , direction;
        public Coordinate() { x = y = direction = 0; }
        public Coordinate(int _x, int _y) { x = _x; y = _y; }
        public Coordinate(int _x, int _y , int d) { x = _x; y = _y; direction = d; }
    }

    class Drone
    {
        public const int CommandLength = 100;//最長指令數
        public Coordinate coordinate;

        public Drone()
        {
            coordinate = new Coordinate(0, 0 , 0);
        }
        public Drone(int x, int y, int direction)
        {
            coordinate = new Coordinate(x , y , direction);
        }

        /// <summary>
        /// 讀取檔案資訊，並執行資訊內容，將結果送到 outputF
        /// </summary>
        /// <param name="filename">檔案名稱。(可省略後面附屬名 .TXT)</param>
        /// <param name="numDrones">無人機數量</param>
        /// <param name="space">飛行空間資訊</param>
        public void inputFile(string filename, ref StringBuilder outputF)
        {
            try
            {
                int[] spaceBoundary;//解讀坐標範圍
                Drone drone;//無人機物件
                string[] initialPosition;//讀取兩列無人機指令
                string commands;//無人機指令碼
                filename += (filename.ToUpper().IndexOf(".TXT") >= 0 ? "" : ".TXT");
                string[] inputF = File.ReadAllLines("../../../" + filename);
                int numDrones = int.Parse(inputF[0]);//解讀第 1 列無人機數量
                spaceBoundary = Array.ConvertAll(inputF[1].Split(' '), int.Parse);//解讀第 2 列坐標範圍
                if ((spaceBoundary[0] > Coordinate.MAX.x) || (spaceBoundary[1] > Coordinate.MAX.y))
                {
                    Console.WriteLine($"區域空間超出範圍 ({Coordinate.MAX.x},{Coordinate.MAX.y})\n請更新檔案內容。");
                    Environment.Exit(0);
                }
                Coordinate space = new Coordinate(spaceBoundary[0], spaceBoundary[1]);//建立空間範圍
                int currentLine = 2;
                for (int i = 0; i < numDrones; i++)
                {
                    initialPosition = inputF[currentLine].Split(' ');
                    drone = new Drone(int.Parse(initialPosition[0]), int.Parse(initialPosition[1]), Coordinate.NESW.IndexOf(initialPosition[2][0]));
                    if ((drone.coordinate.x > Coordinate.MAX.x) || (drone.coordinate.y > Coordinate.MAX.y))
                    {
                        Console.WriteLine($"第 {currentLine} 列，無人機坐標超出範圍 ({Coordinate.MAX.x},{Coordinate.MAX.y})\n請更新檔案內容。");
                        Environment.Exit(0);
                    }
                    commands = inputF[currentLine + 1];
                    if(commands.Length > Drone.CommandLength)
                    {
                        Console.WriteLine($"第 {currentLine + 1} 列，無人機指令超過長度 {Drone.CommandLength}\n請更新檔案內容。");
                        Environment.Exit(0);
                    }
                    drone.ExecuteCommands(commands , space , ref outputF);
                    currentLine += 2;
                }
                Console.WriteLine(outputF.ToString());
                File.WriteAllText("../../../out" + filename , outputF.ToString());
            }
            catch (Exception ex)
            {
                Console.WriteLine("An error occurred: " + ex.Message);
            }
        }

        /// <summary>
        /// 傳回數字對應文字方向
        /// </summary>
        /// <param name="direction"></param>
        /// <returns>0:北，1:東，2:南，3:西</returns>
        public string getDirection(int direction)
        {
            return (Coordinate.NESW.Substring(direction, 1));
        }
        /// <summary>
        /// 傳回是否超出範圍
        /// </summary>
        /// <param name="space">範圍空間</param>
        /// <returns>超出範圍為真</returns>
        public bool outOfRange(Coordinate space)
        {
            return ((coordinate.x < 0) || (coordinate.x >= space.x) || (coordinate.y < 0) || (coordinate.y >= space.y));
        }
        /// <summary>
        /// 執行命令字串
        /// </summary>
        /// <param name="commands">命令字串</param>
        /// <param name="space">飛行允許空間</param>
        /// <param name="outputF">飛行狀態紀錄</param>
        public void ExecuteCommands(string commands , Coordinate space , ref StringBuilder outputF)
        {
            foreach (char command in commands)
            {
                switch (command)
                {
                    case 'L':
                        coordinate.direction = (coordinate.direction + 3) % 4;//逆時針轉 -1
                        break;
                    case 'R':
                        coordinate.direction = (coordinate.direction + 1) % 4;//順時針轉 +1
                        break;
                    case 'F':
                        coordinate.x += Coordinate.dDirection[coordinate.direction].x;
                        coordinate.y += Coordinate.dDirection[coordinate.direction].y;
                        if (outOfRange(space))
                        {
                            outputF.AppendLine($"{coordinate.x} {coordinate.y} {getDirection(coordinate.direction)} Destroyed");
                            return;
                        }
                        break;
                }
            }
            outputF.AppendLine($"{coordinate.x} {coordinate.y} {getDirection(coordinate.direction)}");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Drone drone = new Drone();
            StringBuilder outputF = new StringBuilder(); 
            drone.inputFile("inp2",ref outputF); ;
        }
    }
}