#!/usr/bin/env python3
"""Benchmark ASR with realistic chunk sizes."""

import sys
import os
import subprocess
import json
import tempfile
import time
import shutil
import statistics

VIDEO_SOURCE = "../test_video/BigBuckBunny_320x180.mp4"  # 10 minutes, 62MB
if not os.path.exists(VIDEO_SOURCE):
    print(f"Video not found: {VIDEO_SOURCE}")
    sys.exit(1)


def run_asr_mode(mode_name, max_direct_duration, chunk_duration, description):
    """Run ASR processor with given parameters, return timing."""
    clip_path = os.path.join(temp_dir, f"clip_{mode_name}.mp4")
    output_path = os.path.join(temp_dir, f"output_{mode_name}.json")

    # Copy source video to clip path
    shutil.copy2(VIDEO_SOURCE, clip_path)

    env = os.environ.copy()
    env["MOMENTRY_ASR_MAX_DIRECT_DURATION"] = str(max_direct_duration)
    env["MOMENTRY_ASR_CHUNK_DURATION"] = str(chunk_duration)
    env["MOMENTRY_ASR_MODEL_SIZE"] = "tiny"
    env["MOMENTRY_ASR_COMPUTE_TYPE"] = "int8"

    cmd = [
        "/opt/homebrew/bin/python3.11",
        "scripts/asr_processor.py",
        clip_path,
        output_path,
        "--uuid",
        f"bench_{mode_name}",
    ]

    start_time = time.time()
    proc = subprocess.run(cmd, capture_output=True, env=env, text=True)
    elapsed = time.time() - start_time
    returncode = proc.returncode

    # Read output
    segments = []
    language = ""
    if os.path.exists(output_path):
        with open(output_path, "r") as f:
            data = json.load(f)
            segments = data.get("segments", [])
            language = data.get("language", "")

    # Clean up
    try:
        os.unlink(clip_path)
        os.unlink(output_path)
    except:
        pass

    return {
        "mode": mode_name,
        "description": description,
        "elapsed": elapsed,
        "returncode": returncode,
        "segments": len(segments),
        "language": language,
        "stderr": proc.stderr[:200] if proc.stderr else "",
    }


# Create temporary directory
temp_dir = tempfile.mkdtemp(prefix="asr_bench_real_")
print(f"Benchmark directory: {temp_dir}")

try:
    # Test 1: Direct transcription (video is 10 min, max_direct=30 min)
    print("\n1. Direct transcription (max_direct=1800s, chunk=600s):")
    direct = run_asr_mode(
        "direct",
        max_direct_duration=1800,
        chunk_duration=600,
        description="Direct (video < 30min threshold)",
    )
    print(f"   Time: {direct['elapsed']:.1f}s, Segments: {direct['segments']}")

    # Test 2: Chunked with 1 chunk (force chunked but chunk size = video duration)
    print("\n2. Chunked with 1 chunk (max_direct=300s, chunk=600s):")
    chunked1 = run_asr_mode(
        "chunked1",
        max_direct_duration=300,
        chunk_duration=600,
        description="Chunked with 1 chunk (10 min)",
    )
    print(f"   Time: {chunked1['elapsed']:.1f}s, Segments: {chunked1['segments']}")

    # Test 3: Chunked with 2 chunks (5 min each)
    print("\n3. Chunked with 2 chunks (max_direct=300s, chunk=300s):")
    chunked2 = run_asr_mode(
        "chunked2",
        max_direct_duration=300,
        chunk_duration=300,
        description="Chunked with 2 chunks (5 min each)",
    )
    print(f"   Time: {chunked2['elapsed']:.1f}s, Segments: {chunked2['segments']}")

    # Test 4: Chunked with 5 chunks (2 min each) - worst case
    print("\n4. Chunked with 5 chunks (max_direct=300s, chunk=120s):")
    chunked5 = run_asr_mode(
        "chunked5",
        max_direct_duration=300,
        chunk_duration=120,
        description="Chunked with 5 chunks (2 min each)",
    )
    print(f"   Time: {chunked5['elapsed']:.1f}s, Segments: {chunked5['segments']}")

    # Calculate overheads
    print("\n" + "=" * 60)
    print("OVERHEAD ANALYSIS (compared to direct transcription)")
    print("=" * 60)

    for test in [chunked1, chunked2, chunked5]:
        if direct["elapsed"] > 0:
            overhead = (test["elapsed"] - direct["elapsed"]) / direct["elapsed"] * 100
            status = "✅ ≤5%" if overhead <= 5 else "❌ >5%"
            print(f"\n{test['description']}:")
            print(f"  Time: {test['elapsed']:.1f}s (direct: {direct['elapsed']:.1f}s)")
            print(f"  Overhead: {overhead:.2f}% {status}")
            print(f"  Segments: {test['segments']} (direct: {direct['segments']})")
            if test["segments"] != direct["segments"]:
                print(f"  ⚠️ Segment count mismatch!")

    # Summary
    print("\n" + "=" * 60)
    print("SUMMARY")
    print("=" * 60)
    print(f"Video: {os.path.basename(VIDEO_SOURCE)} (~10 minutes)")
    print(f"\nKey finding: Overhead depends heavily on chunk count.")
    print(f"With realistic chunk sizes (10 min), overhead should be minimal.")

except Exception as e:
    print(f"Benchmark failed: {e}")
    import traceback

    traceback.print_exc()
finally:
    # Clean up directory
    shutil.rmtree(temp_dir, ignore_errors=True)
    print(f"\nCleaned up {temp_dir}")