import pyopencl as cl
import numpy as np
import struct

# ----------------------------
# 1️⃣ Initialize HDGL Lattice
# ----------------------------
ctx = cl.create_some_context()
queue = cl.CommandQueue(ctx)

LATTICE_SIZE = 16 * 1024 * 1024  # 16 MB virtual RAM
lattice_mem = np.zeros(LATTICE_SIZE, dtype=np.uint8)
lattice_buf = cl.Buffer(ctx, cl.mem_flags.READ_WRITE | cl.mem_flags.COPY_HOST_PTR, hostbuf=lattice_mem)

print("[HDGL] Lattice initialized with 16 MB RAM.")

# ----------------------------
# 2️⃣ Load Debian kernel
# ----------------------------
kernel_path = "bzImage"  # Precompiled Debian kernel
with open(kernel_path, "rb") as f:
    kernel_bytes = np.frombuffer(f.read(), dtype=np.uint8)

KERNEL_OFFSET = 0x100000  # 1 MB offset
cl.enqueue_copy(queue, lattice_buf, kernel_bytes, device_offset=KERNEL_OFFSET)
print(f"[HDGL] Debian kernel ({len(kernel_bytes)} bytes) loaded at 0x{KERNEL_OFFSET:X}.")

# ----------------------------
# 3️⃣ Virtual CPU State
# ----------------------------
NUM_REGS = 16
cpu_regs = np.zeros(NUM_REGS, dtype=np.uint64)  # R0-R15
cpu_ip = np.uint64(KERNEL_OFFSET)               # instruction pointer

# Simple flags
ZF = False  # Zero flag
CF = False  # Carry flag

print("[HDGL] Virtual CPU initialized.")

# ----------------------------
# 4️⃣ Trap Handlers
# ----------------------------
def trap_memory(addr, size, write=False, value=None):
    if addr + size > LATTICE_SIZE:
        raise MemoryError(f"Access out of lattice bounds: 0x{addr:X}")
    if write:
        lattice_mem[addr:addr+size] = value
    else:
        return lattice_mem[addr:addr+size]

def trap_io(port, value=None, write=False):
    if write:
        print(f"[IO] Write to port 0x{port:X}: {value}")
    else:
        return 0  # Dummy read

# ----------------------------
# 5️⃣ Minimal x86 Interpreter
# ----------------------------
# Only supports NOP, MOV reg, imm32, ADD reg, reg, JMP rel8 for now
OPCODES = {
    0x90: "NOP",
    0xB8: "MOV_EAX_IMM32",
    0x01: "ADD_EAX_EBX",
    0xEB: "JMP_REL8",
}

TICKS = 500_000

for tick in range(TICKS):
    instr_byte = trap_memory(cpu_ip, 1)[0]

    if instr_byte == 0x90:  # NOP
        cpu_ip += 1
    elif instr_byte == 0xB8:  # MOV EAX, imm32
        imm_bytes = trap_memory(cpu_ip+1, 4)
        imm_val = struct.unpack("<I", imm_bytes)[0]
        cpu_regs[0] = imm_val  # R0 = EAX
        cpu_ip += 5
    elif instr_byte == 0x01:  # ADD EAX, EBX
        cpu_regs[0] += cpu_regs[1]
        cpu_ip += 1
    elif instr_byte == 0xEB:  # JMP rel8
        rel = struct.unpack("b", trap_memory(cpu_ip+1, 1))[0]
        cpu_ip = cpu_ip + 2 + rel
    else:
        cpu_ip += 1  # Unknown instruction: skip

    # Periodic status
    if tick % 50_000 == 0:
        print(f"[Tick {tick}] IP: 0x{cpu_ip:X}, R0: {cpu_regs[0]}")

print("[HDGL] Minimal Debian bootstrap interpreter complete.")
