import logging
import time
import threading
import os
import random

logger = logging.getLogger("OmniClaw.SegfaultTracer")

# eBPF C program to trace signal 11 (SIGSEGV)
bpf_text = """
#include <uapi/linux/ptrace.h>
#include <linux/sched.h>
#include <linux/signal.h>

BPF_PERF_OUTPUT(segfaults);

struct data_t {
    u32 pid;
    u32 sig;
    char comm[TASK_COMM_LEN];
};

int trace_kfree_skb(struct pt_regs *ctx) {
    // This is a placeholder hook for actual segfault tracing
    // Normally we'd hook into get_signal or force_sig_info
    return 0;
}
"""

class SegfaultTracer:
    """
    Experimental "Immortal Kernel" Segfault Tracer.
    Listens for segmentation faults and triggers OmniClaw to analyze the core dump
    and propose a hot-patch (saved to disk, not auto-injected for safety).
    """
    def __init__(self):
        self.bpf = None
        self.running = False
        self.thread = None
        
        try:
            from bcc import BPF
            self.bpf = BPF(text=bpf_text)
            # Placeholder attachment
            logger.info("Segfault Tracer initialized in simulation/degraded mode.")
        except ImportError:
            logger.warning("BCC not installed or unsupported OS. SegfaultTracer running in simulation mode.")
        except Exception as e:
            logger.warning(f"Failed to initialize eBPF for segfault tracing: {e}")

    def start(self):
        self.running = True
        self.thread = threading.Thread(target=self._poll_loop, daemon=True)
        self.thread.start()

    def _poll_loop(self):
        while self.running:
            if self.bpf:
                try:
                    self.bpf.perf_buffer_poll()
                except Exception:
                    time.sleep(1)
            else:
                # Simulation mode: occasionally mock a segfault
                time.sleep(random.uniform(60.0, 180.0))
                mock_procs = ["nginx", "redis-server", "node", "php-fpm"]
                proc = random.choice(mock_procs)
                pid = random.randint(1000, 9999)
                logger.warning(f"[Immortal Kernel Simulation] Caught SIGSEGV in {proc} (PID {pid})")
                self.analyze_crash(pid, proc)
                
    def analyze_crash(self, pid: int, process_name: str) -> str:
        """
        Simulates the AI analyzing a crash dump.
        """
        logger.info(f"Analyzing crash for PID {pid} ({process_name})")
        
        # Hypothetical AI analysis output
        patch_code = f"""// Proposed Patch for {process_name}
void safe_function() {{
    if (ptr != NULL) {{
        // safe execution
    }}
}}
"""
        # In simulation, don't continually append PIDs to filenames to prevent disk filling
        filename = f"patch_{process_name}.c" if not self.bpf else f"patch_{process_name}_{pid}.c"
        patch_path = os.path.abspath(filename)
        
        with open(patch_path, "w") as f:
            f.write(patch_code)
            
        return f"Crash detected in {process_name}. Proposed patch saved to {patch_path}. Review before compiling/injecting."

    def stop(self):
        self.running = False
        if self.thread and self.thread.is_alive():
            self.thread.join(timeout=1)

# Singleton
segfault_tracer = SegfaultTracer()
