#!/usr/bin/env python3
"""
ASR Baseline Test Script
Test ASR processor on ../test_video files and collect performance metrics.
"""

import os
import sys
import time
import json
import subprocess
import tempfile
import traceback
from pathlib import Path
from typing import Dict, List, Optional, Tuple
import psutil
import signal

# Add scripts directory to path for imports
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

# Try to import the ASR processor module
try:
    from scripts.asr_processor import run_asr

    DIRECT_CALL = True
except ImportError as e:
    print(f"Warning: Could not import asr_processor directly: {e}")
    print("Will use subprocess call instead.")
    DIRECT_CALL = False


def get_video_files(video_dir: str) -> List[Path]:
    """Get list of video files from directory."""
    video_exts = {".mp4", ".avi", ".mov", ".mkv", ".flv", ".webm", ".m4v", ".wmv"}
    video_dir_path = Path(video_dir)
    if not video_dir_path.exists():
        raise FileNotFoundError(f"Video directory not found: {video_dir}")

    videos = []
    for ext in video_exts:
        videos.extend(video_dir_path.glob(f"*{ext}"))

    return sorted(videos, key=lambda p: p.stat().st_size)  # Sort by size (small first)


def monitor_process(pid: int, interval: float = 1.0) -> Dict:
    """Monitor process resource usage."""
    try:
        proc = psutil.Process(pid)
        cpu_percent = proc.cpu_percent(interval=interval)
        memory_info = proc.memory_info()
        return {
            "cpu_percent": cpu_percent,
            "rss_mb": memory_info.rss / 1024 / 1024,
            "vms_mb": memory_info.vms / 1024 / 1024,
        }
    except (psutil.NoSuchProcess, psutil.AccessDenied):
        return {}


def run_asr_subprocess(
    video_path: Path, output_path: Path, uuid: str = ""
) -> Tuple[bool, Dict]:
    """Run ASR processor via subprocess and collect metrics."""
    script_path = Path(__file__).parent / "scripts" / "asr_processor.py"
    cmd = [sys.executable, str(script_path), str(video_path), str(output_path)]
    if uuid:
        cmd.extend(["--uuid", uuid])

    start_time = time.time()
    metrics = {
        "success": False,
        "duration": 0,
        "error": None,
        "peak_rss_mb": 0,
        "avg_cpu_percent": 0,
        "exit_code": None,
        "stderr": "",
    }

    try:
        # Start process
        proc = subprocess.Popen(
            cmd,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True,
            preexec_fn=os.setsid,  # Create process group for better termination
        )

        # Monitor resources
        cpu_readings = []
        memory_readings = []
        monitor_start = time.time()

        while True:
            # Check if process is still running
            if proc.poll() is not None:
                break

            # Monitor resources every 2 seconds
            if time.time() - monitor_start >= 2.0:
                try:
                    ps_proc = psutil.Process(proc.pid)
                    cpu_readings.append(ps_proc.cpu_percent())
                    memory_readings.append(ps_proc.memory_info().rss / 1024 / 1024)
                except (psutil.NoSuchProcess, psutil.AccessDenied):
                    pass
                monitor_start = time.time()

            time.sleep(0.5)

        # Wait for process to complete
        stdout, stderr = proc.communicate(timeout=300)  # 5 minute timeout
        metrics["duration"] = time.time() - start_time
        metrics["exit_code"] = proc.returncode
        metrics["stderr"] = stderr.strip()

        if proc.returncode == 0:
            metrics["success"] = True
        else:
            metrics["error"] = f"Process exited with code {proc.returncode}"

        # Calculate resource metrics
        if cpu_readings:
            metrics["avg_cpu_percent"] = sum(cpu_readings) / len(cpu_readings)
        if memory_readings:
            metrics["peak_rss_mb"] = max(memory_readings)

    except subprocess.TimeoutExpired:
        metrics["error"] = "Process timed out after 5 minutes"
        metrics["duration"] = time.time() - start_time
        # Try to kill the process group
        try:
            os.killpg(os.getpgid(proc.pid), signal.SIGKILL)
        except:
            pass
    except Exception as e:
        metrics["error"] = str(e)
        metrics["duration"] = time.time() - start_time

    return metrics["success"], metrics


def run_asr_direct(
    video_path: Path, output_path: Path, uuid: str = ""
) -> Tuple[bool, Dict]:
    """Run ASR processor by directly calling the function."""
    import scripts.asr_processor as asr_module

    start_time = time.time()
    metrics = {
        "success": False,
        "duration": 0,
        "error": None,
        "peak_rss_mb": 0,
        "avg_cpu_percent": 0,
    }

    try:
        # Monitor in background thread
        import threading
        import queue

        cpu_readings = []
        memory_readings = []
        stop_monitor = threading.Event()

        def monitor_thread():
            while not stop_monitor.is_set():
                try:
                    # Monitor current process
                    proc = psutil.Process()
                    cpu_readings.append(proc.cpu_percent(interval=0.5))
                    memory_readings.append(proc.memory_info().rss / 1024 / 1024)
                except:
                    pass

        monitor = threading.Thread(target=monitor_thread, daemon=True)
        monitor.start()

        # Run ASR
        asr_module.run_asr(str(video_path), str(output_path), uuid)

        # Stop monitoring
        stop_monitor.set()
        monitor.join(timeout=2.0)

        metrics["duration"] = time.time() - start_time
        metrics["success"] = True

        # Calculate resource metrics
        if cpu_readings:
            metrics["avg_cpu_percent"] = sum(cpu_readings) / len(cpu_readings)
        if memory_readings:
            metrics["peak_rss_mb"] = max(memory_readings)

    except Exception as e:
        metrics["error"] = str(e)
        metrics["duration"] = time.time() - start_time
        traceback.print_exc()

    return metrics["success"], metrics


def test_video(video_path: Path, test_dir: Path, index: int, total: int) -> Dict:
    """Test ASR on a single video file."""
    print(f"\n{'=' * 60}")
    print(f"Testing [{index}/{total}]: {video_path.name}")
    print(f"Size: {video_path.stat().st_size / 1024 / 1024:.1f} MB")
    print(f"Path: {video_path}")

    # Create output file path
    output_file = test_dir / f"{video_path.stem}.asr.json"

    # Run ASR
    start_time = time.time()

    if DIRECT_CALL:
        success, metrics = run_asr_direct(video_path, output_file, uuid="")
    else:
        success, metrics = run_asr_subprocess(video_path, output_file, uuid="")

    # Check if output was created
    output_exists = output_file.exists()
    if output_exists:
        try:
            with open(output_file, "r") as f:
                result = json.load(f)
            segments = len(result.get("segments", []))
            language = result.get("language", "unknown")
            metrics["segments"] = segments
            metrics["language"] = language
        except Exception as e:
            metrics["json_error"] = str(e)

    # Compile test result
    test_result = {
        "video": video_path.name,
        "video_size_mb": video_path.stat().st_size / 1024 / 1024,
        "success": success,
        "output_exists": output_exists,
        **metrics,
    }

    # Print summary
    if success:
        print(
            f"✓ SUCCESS: {metrics['duration']:.1f}s, {metrics.get('segments', 0)} segments"
        )
        if "peak_rss_mb" in metrics:
            print(
                f"  Peak RAM: {metrics['peak_rss_mb']:.1f} MB, Avg CPU: {metrics['avg_cpu_percent']:.1f}%"
            )
    else:
        print(f"✗ FAILED: {metrics.get('error', 'Unknown error')}")

    return test_result


def main():
    """Main test function."""
    video_dir = "../test_video"
    if not os.path.exists(video_dir):
        print(f"Error: Video directory '{video_dir}' not found.")
        sys.exit(1)

    # Create test directory for outputs
    test_dir = Path("test_output")
    test_dir.mkdir(exist_ok=True)

    # Get video files
    videos = get_video_files(video_dir)
    if not videos:
        print(f"No video files found in {video_dir}")
        return

    print(f"Found {len(videos)} video files in {video_dir}")
    print("Starting ASR baseline tests...")

    results = []
    for i, video in enumerate(videos, 1):
        try:
            result = test_video(video, test_dir, i, len(videos))
            results.append(result)

            # Save intermediate results
            with open(test_dir / "results.json", "w") as f:
                json.dump(results, f, indent=2)

        except KeyboardInterrupt:
            print("\n\nTest interrupted by user.")
            break
        except Exception as e:
            print(f"\nUnexpected error testing {video.name}: {e}")
            traceback.print_exc()

    # Generate summary report
    print(f"\n{'=' * 60}")
    print("TEST SUMMARY")
    print(f"{'=' * 60}")

    successful = [r for r in results if r["success"]]
    failed = [r for r in results if not r["success"]]

    print(f"Total videos: {len(results)}")
    print(f"Successful: {len(successful)}")
    print(f"Failed: {len(failed)}")

    if successful:
        avg_duration = sum(r["duration"] for r in successful) / len(successful)
        avg_segments = sum(r.get("segments", 0) for r in successful) / len(successful)
        print(f"\nAverage duration: {avg_duration:.1f}s")
        print(f"Average segments: {avg_segments:.1f}")

    if failed:
        print(f"\nFailed videos:")
        for r in failed:
            print(f"  - {r['video']}: {r.get('error', 'Unknown error')}")

    # Save detailed report
    report_path = test_dir / "detailed_report.json"
    with open(report_path, "w") as f:
        json.dump(results, f, indent=2)

    print(f"\nDetailed results saved to: {report_path}")
    print(f"Test outputs saved to: {test_dir}/")


if __name__ == "__main__":
    main()