package org.jcnc.snow.vm.factories;

import org.jcnc.snow.vm.commands.type.control.byte8.*;
import org.jcnc.snow.vm.commands.type.control.double64.*;
import org.jcnc.snow.vm.commands.type.control.float32.*;
import org.jcnc.snow.vm.commands.type.control.int32.*;
import org.jcnc.snow.vm.commands.type.control.long64.*;
import org.jcnc.snow.vm.commands.type.control.short16.*;
import org.jcnc.snow.vm.commands.type.control.byte8.BAndCommand;
import org.jcnc.snow.vm.commands.type.control.byte8.BOrCommand;
import org.jcnc.snow.vm.commands.type.control.byte8.BXorCommand;
import org.jcnc.snow.vm.commands.type.control.int32.IAndCommand;
import org.jcnc.snow.vm.commands.type.control.int32.IOrCommand;
import org.jcnc.snow.vm.commands.type.control.int32.IXorCommand;
import org.jcnc.snow.vm.commands.type.control.long64.LAndCommand;
import org.jcnc.snow.vm.commands.type.control.long64.LOrCommand;
import org.jcnc.snow.vm.commands.type.control.long64.LXorCommand;
import org.jcnc.snow.vm.commands.type.control.short16.SAndCommand;
import org.jcnc.snow.vm.commands.type.control.short16.SOrCommand;
import org.jcnc.snow.vm.commands.type.control.short16.SXorCommand;
import org.jcnc.snow.vm.commands.flow.control.JumpCommand;
import org.jcnc.snow.vm.commands.flow.control.CallCommand;
import org.jcnc.snow.vm.commands.flow.control.RetCommand;
import org.jcnc.snow.vm.commands.register.control.MovCommand;
import org.jcnc.snow.vm.commands.type.control.byte8.BLoadCommand;
import org.jcnc.snow.vm.commands.type.control.byte8.BStoreCommand;
import org.jcnc.snow.vm.commands.type.control.double64.DLoadCommand;
import org.jcnc.snow.vm.commands.type.control.double64.DStoreCommand;
import org.jcnc.snow.vm.commands.type.control.float32.FLoadCommand;
import org.jcnc.snow.vm.commands.type.control.float32.FStoreCommand;
import org.jcnc.snow.vm.commands.type.control.int32.ILoadCommand;
import org.jcnc.snow.vm.commands.type.control.int32.IStoreCommand;
import org.jcnc.snow.vm.commands.type.control.long64.LLoadCommand;
import org.jcnc.snow.vm.commands.type.control.long64.LStoreCommand;
import org.jcnc.snow.vm.commands.type.control.short16.SLoadCommand;
import org.jcnc.snow.vm.commands.type.control.short16.SStoreCommand;
import org.jcnc.snow.vm.commands.stack.control.DupCommand;
import org.jcnc.snow.vm.commands.stack.control.PopCommand;
import org.jcnc.snow.vm.commands.stack.control.SwapCommand;
import org.jcnc.snow.vm.commands.type.control.byte8.BPushCommand;
import org.jcnc.snow.vm.commands.type.control.double64.DPushCommand;
import org.jcnc.snow.vm.commands.type.control.float32.FPushCommand;
import org.jcnc.snow.vm.commands.type.control.int32.IPushCommand;
import org.jcnc.snow.vm.commands.type.control.long64.LPushCommand;
import org.jcnc.snow.vm.commands.type.control.short16.SPushCommand;
import org.jcnc.snow.vm.commands.type.conversion.*;
import org.jcnc.snow.vm.commands.system.control.HaltCommand;
import org.jcnc.snow.vm.engine.VMOpCode;
import org.jcnc.snow.vm.interfaces.Command;

import java.util.Optional;

/**
 * The CommandFactory class is responsible
 * for getting the corresponding instruction instance based on the operation code.
 * <p>This class uses an array for fast, constant-time access to corresponding command instances.</p>
 */
public class CommandFactory {
    /** Complete command table. 0x0000 – 0x04FF (inclusive). */
    private static final Command[] COMMANDS = new Command[0x0500];

    static {

        // region Type Control (0x0000-0x00BF)
        // region Byte8	 (0x0000-0x001F)
        COMMANDS[VMOpCode.B_ADD]   = new BAddCommand();
        COMMANDS[VMOpCode.B_SUB]   = new BSubCommand();
        COMMANDS[VMOpCode.B_MUL]   = new BMulCommand();
        COMMANDS[VMOpCode.B_DIV]   = new BDivCommand();
        COMMANDS[VMOpCode.B_MOD]   = new BModCommand();
        COMMANDS[VMOpCode.B_NEG]   = new BNegCommand();
        COMMANDS[VMOpCode.B_INC]   = new BIncCommand();

        COMMANDS[VMOpCode.B_AND]   = new BAndCommand();
        COMMANDS[VMOpCode.B_OR]    = new BOrCommand();
        COMMANDS[VMOpCode.B_XOR]   = new BXorCommand();

        COMMANDS[VMOpCode.B_PUSH]  = new BPushCommand();
        COMMANDS[VMOpCode.B_LOAD]  = new BLoadCommand();
        COMMANDS[VMOpCode.B_STORE] = new BStoreCommand();

        COMMANDS[VMOpCode.B_CE]    = new BCECommand();
        COMMANDS[VMOpCode.B_CNE]   = new BCNECommand();
        COMMANDS[VMOpCode.B_CG]    = new BCGCommand();
        COMMANDS[VMOpCode.B_CGE]   = new BCGECommand();
        COMMANDS[VMOpCode.B_CL]    = new BCLCommand();
        COMMANDS[VMOpCode.B_CLE]   = new BCLECommand();

        // endregion

        // region Short16 (0x0020-0x003F)
        COMMANDS[VMOpCode.S_ADD]   = new SAddCommand();
        COMMANDS[VMOpCode.S_SUB]   = new SSubCommand();
        COMMANDS[VMOpCode.S_MUL]   = new SMulCommand();
        COMMANDS[VMOpCode.S_DIV]   = new SDivCommand();
        COMMANDS[VMOpCode.S_MOD]   = new SModCommand();
        COMMANDS[VMOpCode.S_NEG]   = new SNegCommand();
        COMMANDS[VMOpCode.S_INC]   = new SIncCommand();

        COMMANDS[VMOpCode.S_AND]   = new SAndCommand();
        COMMANDS[VMOpCode.S_OR]    = new SOrCommand();
        COMMANDS[VMOpCode.S_XOR]   = new SXorCommand();

        COMMANDS[VMOpCode.S_PUSH]  = new SPushCommand();
        COMMANDS[VMOpCode.S_LOAD]  = new SLoadCommand();
        COMMANDS[VMOpCode.S_STORE] = new SStoreCommand();

        COMMANDS[VMOpCode.S_CE]    = new SCECommand();
        COMMANDS[VMOpCode.S_CNE]   = new SCNECommand();
        COMMANDS[VMOpCode.S_CG]    = new SCGCommand();
        COMMANDS[VMOpCode.S_CGE]   = new SCGECommand();
        COMMANDS[VMOpCode.S_CL]    = new SCLCommand();
        COMMANDS[VMOpCode.S_CLE]   = new SCLECommand();
        // endregion

        // region Int32 (0x0040-0x005F)
        COMMANDS[VMOpCode.I_ADD]   = new IAddCommand();
        COMMANDS[VMOpCode.I_SUB]   = new ISubCommand();
        COMMANDS[VMOpCode.I_MUL]   = new IMulCommand();
        COMMANDS[VMOpCode.I_DIV]   = new IDivCommand();
        COMMANDS[VMOpCode.I_MOD]   = new IModCommand();
        COMMANDS[VMOpCode.I_NEG]   = new INegCommand();
        COMMANDS[VMOpCode.I_INC]   = new IIncCommand();

        COMMANDS[VMOpCode.I_AND]   = new IAndCommand();
        COMMANDS[VMOpCode.I_OR]    = new IOrCommand();
        COMMANDS[VMOpCode.I_XOR]   = new IXorCommand();

        COMMANDS[VMOpCode.I_PUSH]  = new IPushCommand();
        COMMANDS[VMOpCode.I_LOAD]  = new ILoadCommand();
        COMMANDS[VMOpCode.I_STORE] = new IStoreCommand();

        COMMANDS[VMOpCode.I_CE]    = new ICECommand();
        COMMANDS[VMOpCode.I_CNE]   = new ICNECommand();
        COMMANDS[VMOpCode.I_CG]    = new ICGCommand();
        COMMANDS[VMOpCode.I_CGE]   = new ICGECommand();
        COMMANDS[VMOpCode.I_CL]    = new ICLCommand();
        COMMANDS[VMOpCode.I_CLE]   = new ICLECommand();
        // endregion

        // region Long64 (0x0060-0x007F)
        COMMANDS[VMOpCode.L_ADD]   = new LAddCommand();
        COMMANDS[VMOpCode.L_SUB]   = new LSubCommand();
        COMMANDS[VMOpCode.L_MUL]   = new LMulCommand();
        COMMANDS[VMOpCode.L_DIV]   = new LDivCommand();
        COMMANDS[VMOpCode.L_MOD]   = new LModCommand();
        COMMANDS[VMOpCode.L_NEG]   = new LNegCommand();
        COMMANDS[VMOpCode.L_INC]   = new LIncCommand();

        COMMANDS[VMOpCode.L_AND]   = new LAndCommand();
        COMMANDS[VMOpCode.L_OR]    = new LOrCommand();
        COMMANDS[VMOpCode.L_XOR]   = new LXorCommand();

        COMMANDS[VMOpCode.L_PUSH]  = new LPushCommand();
        COMMANDS[VMOpCode.L_LOAD]  = new LLoadCommand();
        COMMANDS[VMOpCode.L_STORE] = new LStoreCommand();

        COMMANDS[VMOpCode.L_CE]    = new LCECommand();
        COMMANDS[VMOpCode.L_CNE]   = new LCNECommand();
        COMMANDS[VMOpCode.L_CG]    = new LCGCommand();
        COMMANDS[VMOpCode.L_CGE]   = new LCGECommand();
        COMMANDS[VMOpCode.L_CL]    = new LCLCommand();
        COMMANDS[VMOpCode.L_CLE]   = new LCLECommand();
        // endregion

        // region Float32 (0x0080-0x009F)
        COMMANDS[VMOpCode.F_ADD]   = new FAddCommand();
        COMMANDS[VMOpCode.F_SUB]   = new FSubCommand();
        COMMANDS[VMOpCode.F_MUL]   = new FMulCommand();
        COMMANDS[VMOpCode.F_DIV]   = new FDivCommand();
        COMMANDS[VMOpCode.F_MOD]   = new FModCommand();
        COMMANDS[VMOpCode.F_NEG]   = new FNegCommand();
        COMMANDS[VMOpCode.F_INC]   = new FIncCommand();

        COMMANDS[VMOpCode.F_PUSH]  = new FPushCommand();
        COMMANDS[VMOpCode.F_LOAD]  = new FLoadCommand();
        COMMANDS[VMOpCode.F_STORE] = new FStoreCommand();

        COMMANDS[VMOpCode.F_CE]    = new FCECommand();
        COMMANDS[VMOpCode.F_CNE]   = new FCNECommand();
        COMMANDS[VMOpCode.F_CG]    = new FCGCommand();
        COMMANDS[VMOpCode.F_CGE]   = new FCGECommand();
        COMMANDS[VMOpCode.F_CL]    = new FCLCommand();
        COMMANDS[VMOpCode.F_CLE]   = new FCLECommand();
        // endregion

        // region Double64 (0x00A0-0x00BF)
        COMMANDS[VMOpCode.D_ADD]   = new DAddCommand();
        COMMANDS[VMOpCode.D_SUB]   = new DSubCommand();
        COMMANDS[VMOpCode.D_MUL]   = new DMulCommand();
        COMMANDS[VMOpCode.D_DIV]   = new DDivCommand();
        COMMANDS[VMOpCode.D_MOD]   = new DModCommand();
        COMMANDS[VMOpCode.D_NEG]   = new DNegCommand();
        COMMANDS[VMOpCode.D_INC]   = new DIncCommand();

        COMMANDS[VMOpCode.D_PUSH]  = new DPushCommand();
        COMMANDS[VMOpCode.D_LOAD]  = new DLoadCommand();
        COMMANDS[VMOpCode.D_STORE] = new DStoreCommand();

        COMMANDS[VMOpCode.D_CE]    = new DCECommand();
        COMMANDS[VMOpCode.D_CNE]   = new DCNECommand();
        COMMANDS[VMOpCode.D_CG]    = new DCGCommand();
        COMMANDS[VMOpCode.D_CGE]   = new DCGECommand();
        COMMANDS[VMOpCode.D_CL]    = new DCLCommand();
        COMMANDS[VMOpCode.D_CLE]   = new DCLECommand();
        // endregion
        // endregion

        // region Type Conversion (0x00C0-0x00DF)
        COMMANDS[VMOpCode.B2S] = new B2SCommand();
        COMMANDS[VMOpCode.B2I] = new B2ICommand();
        COMMANDS[VMOpCode.B2L] = new B2LCommand();
        COMMANDS[VMOpCode.B2F] = new B2FCommand();
        COMMANDS[VMOpCode.B2D] = new B2DCommand();

        COMMANDS[VMOpCode.S2B] = new S2BCommand();
        COMMANDS[VMOpCode.S2I] = new S2ICommand();
        COMMANDS[VMOpCode.S2L] = new S2LCommand();
        COMMANDS[VMOpCode.S2F] = new S2FCommand();
        COMMANDS[VMOpCode.S2D] = new S2DCommand();

        COMMANDS[VMOpCode.I2B] = new I2BCommand();
        COMMANDS[VMOpCode.I2S] = new I2SCommand();
        COMMANDS[VMOpCode.I2L] = new I2LCommand();
        COMMANDS[VMOpCode.I2F] = new I2FCommand();
        COMMANDS[VMOpCode.I2D] = new I2DCommand();

        COMMANDS[VMOpCode.L2B] = new L2BCommand();
        COMMANDS[VMOpCode.L2S] = new L2SCommand();
        COMMANDS[VMOpCode.L2I] = new L2ICommand();
        COMMANDS[VMOpCode.L2F] = new L2FCommand();
        COMMANDS[VMOpCode.L2D] = new L2DCommand();

        COMMANDS[VMOpCode.F2B] = new F2BCommand();
        COMMANDS[VMOpCode.F2S] = new F2SCommand();
        COMMANDS[VMOpCode.F2I] = new F2ICommand();
        COMMANDS[VMOpCode.F2L] = new F2LCommand();
        COMMANDS[VMOpCode.F2D] = new F2DCommand();

        COMMANDS[VMOpCode.D2B] = new D2BCommand();
        COMMANDS[VMOpCode.D2S] = new D2SCommand();
        COMMANDS[VMOpCode.D2I] = new D2ICommand();
        COMMANDS[VMOpCode.D2L] = new D2LCommand();
        COMMANDS[VMOpCode.D2F] = new D2FCommand();
        // endregion

        // region Stack Control (0x0100-0x01FF)
        COMMANDS[VMOpCode.POP]  = new PopCommand();
        COMMANDS[VMOpCode.DUP]  = new DupCommand();
        COMMANDS[VMOpCode.SWAP] = new SwapCommand();
        // endregion

        // region Flow Control (0x0200-0x02FF)
        COMMANDS[VMOpCode.JUMP] = new JumpCommand();
        COMMANDS[VMOpCode.CALL] = new CallCommand();
        COMMANDS[VMOpCode.RET]  = new RetCommand();
        // endregion

        // region Register Control (0x0300-0x03FF)
        COMMANDS[VMOpCode.MOV]  = new MovCommand();
        // endregion

        // region  System Control (0x0400-0x04FF)
        COMMANDS[VMOpCode.HALT]        = new HaltCommand();
//        COMMANDS[VMOpCode.SYSCALL]     = new SyscallCommand();
//        COMMANDS[VMOpCode.DEBUG_TRAP]  = new DebugTrapCommand();
        // endregion

    }


    /**
     * Default constructor for creating an instance of CommandFactory.
     * This constructor is empty as no specific initialization is required.
     */
    public CommandFactory() {
        // Empty constructor
    }

    /**
     * Retrieves the corresponding command instance based on the operation code.
     * <p>This method looks up the given operation code and returns the corresponding command instance.</p>
     *
     * @param opCode The operation code (instruction code)
     * @return An Optional containing the command object. If a command exists for the operation code, it returns the command instance; otherwise, an empty Optional is returned.
     */
    public static Optional<Command> getInstruction(int opCode) {
        if (opCode >= 0 && opCode < COMMANDS.length) {
            Command command = COMMANDS[opCode];
            return Optional.ofNullable(command);  // Return the command if it's present, otherwise return empty Optional
        }
        // Return empty Optional if opCode is out of range
        return Optional.empty();
    }
}
