import pyopencl as cl
import numpy as np
import os

# -------------------------------
# HDGL Platform & Context
# -------------------------------
platforms = cl.get_platforms()
device = platforms[0].get_devices()[0]
ctx = cl.Context([device])
queue = cl.CommandQueue(ctx)

# -------------------------------
# HDGL Dynamic Channels
# -------------------------------
CHANNELS = 128
PAGE_SIZE = 4096
NUM_PAGES = 128*1024  # 512MB
hdgl_mem = cl.Buffer(ctx, cl.mem_flags.READ_WRITE, size=NUM_PAGES*PAGE_SIZE)
channel_mem = cl.Buffer(ctx, cl.mem_flags.READ_WRITE, size=CHANNELS*8)

# Initialize channels (Ω tension)
channels_np = np.array([1.0/(1.618**(i+1))**7 for i in range(CHANNELS)], dtype=np.float64)
cl.enqueue_copy(queue, channel_mem, channels_np)

# -------------------------------
# Page Table (dynamic mapping)
# -------------------------------
page_table = np.full(NUM_PAGES, -1, dtype=np.int32)  # -1 = unmapped

# -------------------------------
# Kernel: Page-Fault-Driven Mapping
# -------------------------------
kernel_source = """
__kernel void hdgl_page_fault(
    __global uchar* ram,
    __global int* page_table,
    __global double* channels,
    const int num_channels,
    const int page_size
){
    int page_id = get_global_id(0);
    
    if(page_table[page_id] == -1){
        // Assign free channel (round-robin)
        int ch = page_id % num_channels;
        page_table[page_id] = ch;

        // Initialize page with harmonic tension
        for(int i=0;i<page_size;i++){
            ram[page_id*page_size + i] = (uchar)((channels[ch]*255.0) + i%256);
        }

        // Harmonic fusion
        for(int i=0;i<num_channels;i++){
            channels[i] *= 0.999 + 0.001*(i==ch);
        }
    }
}
"""
program = cl.Program(ctx, kernel_source).build()

# -------------------------------
# Simulate OS Page Access
# -------------------------------
page_table_buf = cl.Buffer(ctx, cl.mem_flags.READ_WRITE | cl.mem_flags.COPY_HOST_PTR, hostbuf=page_table)

# Launch kernel for all pages
program.hdgl_page_fault(queue, (NUM_PAGES,), None, hdgl_mem, page_table_buf, channel_mem, np.int32(CHANNELS), np.int32(PAGE_SIZE))

# Retrieve updated page table
cl.enqueue_copy(queue, page_table, page_table_buf)
print("Mapped Pages:", np.count_nonzero(page_table >= 0))
