using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using SDL2;

namespace Core
{
    public class Operations
    {
        public Dictionary<string, int> Variables = new Dictionary<string, int>();
        public static int WindowSize;
        public int Accumulator = 0;
        public int StackX = 0;
        public int StackY = 0;
        public int[] Memory = new int[256];
        public string Filename;
        public int pointer = 0;

        // Declare them here without `new int[WindowSize]`
        public int[,] PixBufferR;
        public int[,] PixBufferG;
        public int[,] PixBufferB;
        public int[] ColorBuffer = new int[3];

        public int f_IsEqu;
        public int f_IsZer;

        public Operations(int pixBufSize)
        {
            WindowSize = pixBufSize;
        }


        private int ResolveValue(string shite)
        {
            if (shite.Any(char.IsLetter))
            {
                switch (shite)
                {
                    case "ACC":
                        return Accumulator;
                    case "RAX":
                        return StackX;
                    case "RAY":
                        return StackY;
                    case "f_IsEqual":
                        return f_IsEqu;
                    case "f_IsZero":
                        return f_IsZer;
                }
                Variables.TryGetValue(shite, out int a);
                return a;
            }
            else
            {
                int.TryParse(shite, out int a);
                return a;
            }
        }

        private int booltoint(bool val)
        {
            return (val == true) ? 1 : 0;
        }


        public void ExecuteCommand(ComponentType type, string[] args)
        {
            switch (type)
            {
                default: return;
                // Variables
                case ComponentType.NVAR:
                    string name = args[1];
                    int value = ResolveValue(args[2]);
                    Variables.Add(name, value);
                    return;
                case ComponentType.RVAR:
                    string rname = args[1];
                    Variables.Remove(rname);
                    return;
                case ComponentType.SVAR:
                    string sname = args[1];
                    int svalue = ResolveValue(args[2]);
                    Variables[sname] = svalue;
                    return;


                // Memory/stack shite
                case ComponentType.LDA:
                    Accumulator = Memory[ResolveValue(args[1])];
                    return;
                case ComponentType.STA:
                    Memory[ResolveValue(args[1])] = Accumulator;
                    return;
                case ComponentType.LDX:
                    StackX = Accumulator;
                    return;
                case ComponentType.LDY:
                    StackY = Accumulator;
                    return;
                case ComponentType.STX:
                    Accumulator = StackX;
                    return;
                case ComponentType.STY:
                    Accumulator = StackY;
                    return;
                case ComponentType.SEA:
                    Accumulator = ResolveValue(args[1]);
                    return;


                // flow control
                case ComponentType.JMP:
                    pointer = ResolveValue(args[1]) - 1;
                    return;
                case ComponentType.JNZE:
                    if (f_IsZer != 1)
                    {
                        pointer = ResolveValue(args[1]) - 1;
                    }
                    return;
                case ComponentType.JIE:
                    if (f_IsEqu== 1)
                    {
                        pointer = ResolveValue(args[1]) - 1;
                    }
                    return;
                case ComponentType.GIE:
                    f_IsEqu = booltoint(StackX == StackY);
                    return;

                // math
                case ComponentType.ADD:
                    Accumulator = StackX + StackY;
                    return;
                case ComponentType.SUB:
                    Accumulator = StackX - StackY;
                    return;
                case ComponentType.MUL:
                    Accumulator = StackX * StackY;
                    return;
                case ComponentType.DIV:
                    Accumulator = StackX / StackY;
                    return;

                // drawing
                case ComponentType.CPXBF:
                    ExecuteCommand(ComponentType.SVAR, new[] { args[1], WindowSize.ToString() });
                    PixBufferR = new int[WindowSize, WindowSize];
                    PixBufferG = new int[WindowSize, WindowSize];
                    PixBufferB = new int[WindowSize, WindowSize];
                    return;
                case ComponentType.DCLR:
                    ColorBuffer = new int[] { args[1] };



                // Debug commands
                case ComponentType.PRA:
                    Console.WriteLine(Accumulator);
                    return;
                case ComponentType.PRX:
                    Console.WriteLine(StackX);
                    return;
                case ComponentType.PRY:
                    Console.WriteLine(StackY);
                    return;
                case ComponentType.PRM:
                    int.TryParse(args[1], out int valB);
                    Console.WriteLine(Memory[valB]);
                    return;
                case ComponentType.HLT:
                    while (true) { }
            }
        }
        public void EquParserLoop(string equ)
        {
            string[] lines = equ.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None);

            // Pass 1: Collect labels with correct line tracking
            for (int i = 0; i < lines.Length; i++)
            {
                string trimmedLine = lines[i].Trim();
                if (trimmedLine.StartsWith("@"))
                {
                    string labelName = trimmedLine.Substring(1);
                    Variables[labelName] = i; // Point to the line index
                }
            }

            // Pass 2: Execution loop
            while (pointer < lines.Length)
            {
                string[] tokens = lines[pointer].Split(new char[] { ' ', ',' }, StringSplitOptions.RemoveEmptyEntries);

                if (tokens.Length == 0 || tokens[0].StartsWith("@"))
                {
                    pointer++;
                    continue;
                }

                string command = tokens[0];

                switch (command)
                {
                    case "::":
                        break;
                    // Variables
                    case "NVAR": ExecuteCommand(ComponentType.NVAR, tokens); break;
                    case "RVAR": ExecuteCommand(ComponentType.RVAR, tokens); break;
                    case "SVAR": ExecuteCommand(ComponentType.SVAR, tokens); break;

                    // Memory
                    case "LDA": ExecuteCommand(ComponentType.LDA, tokens); break;
                    case "STA": ExecuteCommand(ComponentType.STA, tokens); break;
                    case "LDX": ExecuteCommand(ComponentType.LDX, tokens); break;
                    case "LDY": ExecuteCommand(ComponentType.LDY, tokens); break;
                    case "STX": ExecuteCommand(ComponentType.STX, tokens); break;
                    case "STY": ExecuteCommand(ComponentType.STY, tokens); break;
                    case "SEA": ExecuteCommand(ComponentType.SEA, tokens); break;

                    // Flow control
                    case "JMP": ExecuteCommand(ComponentType.JMP, tokens); break;
                    case "JNZE": ExecuteCommand(ComponentType.JNZE, tokens); break;
                    case "JIE": ExecuteCommand(ComponentType.JIE, tokens); break;
                    case "GIE": ExecuteCommand(ComponentType.GIE, tokens); break;

                    // Math (Added missing operations)
                    case "ADD": ExecuteCommand(ComponentType.ADD, tokens); break;
                    case "SUB": ExecuteCommand(ComponentType.SUB, tokens); break;
                    case "MUL": ExecuteCommand(ComponentType.MUL, tokens); break;
                    case "DIV": ExecuteCommand(ComponentType.DIV, tokens); break;

                    // drawing
                    case "CPXBF": break; // create pixel buffer
                    case "PBSET": break; // set a pixel in the buffer
                    case "PBCLEAR": break; // clear buffer
                    case "DCLR": break; // set draw color

                    // Debug
                    case "PRA": ExecuteCommand(ComponentType.PRA, tokens); break;
                    case "PRX": ExecuteCommand(ComponentType.PRX, tokens); break;
                    case "PRY": ExecuteCommand(ComponentType.PRY, tokens); break;
                    case "PRM": ExecuteCommand(ComponentType.PRM, tokens); break;
                    case "HLT": ExecuteCommand(ComponentType.HLT, tokens); break;
                }
                pointer++;
            }
        }
    }
}