"""Executor: Search API, download trace video, extract key frames"""
import json, subprocess, os, cv2, sys
from PIL import Image

API = "http://localhost:3003"
KEY = "muser_68600856036340bcafc01930eb4bd839_1774418104_97221b69"

FRAME_OUTPUT = "/tmp/qa"
os.makedirs(FRAME_OUTPUT, exist_ok=True)
sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
sys.path.insert(0, os.path.dirname(__file__))


def find_trace_by_identity(actor_name, file_uuid):
    """Find a trace_id for a TMDB actor from the DB."""
    import psycopg2
    conn = psycopg2.connect("postgresql://accusys@localhost:5432/momentry")
    cur = conn.cursor()
    cur.execute("""
        SELECT fd.trace_id, COUNT(*) as faces
        FROM dev.face_detections fd
        JOIN dev.identities i ON i.id = fd.identity_id
        WHERE i.name = %s AND fd.file_uuid = %s AND fd.trace_id IS NOT NULL
        GROUP BY fd.trace_id
        ORDER BY faces DESC LIMIT 1
    """, (actor_name, file_uuid))
    row = cur.fetchone()
    cur.close()
    conn.close()
    return row[0] if row else None


def find_trace_in_frame_range(start_frame, end_frame, file_uuid):
    """Find a trace that appears in the given frame range."""
    import psycopg2
    conn = psycopg2.connect("postgresql://accusys@localhost:5432/momentry")
    cur = conn.cursor()
    cur.execute("""
        SELECT trace_id, COUNT(*) as faces
        FROM dev.face_detections
        WHERE file_uuid = %s AND trace_id IS NOT NULL
          AND frame_number BETWEEN %s AND %s
        GROUP BY trace_id
        ORDER BY faces DESC LIMIT 1
    """, (file_uuid, start_frame, end_frame))
    row = cur.fetchone()
    cur.close()
    conn.close()
    return row[0] if row else None


def find_trace_by_object(object_name, file_uuid):
    """Find a trace in a frame range where YOLO detects the object."""
    import json, os
    yolo_path = os.path.join("/Users/accusys/momentry/output_dev", f"{file_uuid}.yolo.json")
    if not os.path.exists(yolo_path):
        return find_trace_in_frame_range(0, 1000000, file_uuid)
    
    with open(yolo_path) as f:
        yolo = json.load(f)
    
    # Find first frame with the object
    for fnum_str, frm in yolo.get("frames", {}).items():
        for det in frm.get("detections", []):
            cls = det.get("class_name", "").lower()
            if object_name.lower() in cls.lower():
                target_frame = int(fnum_str)
                return find_trace_in_frame_range(
                    max(0, target_frame - 50),
                    target_frame + 50,
                    file_uuid
                )
    return None


def download_trace_video(file_uuid, trace_id, output_path):
    """Download trace video in normal mode (no overlay)."""
    cmd = [
        "curl", "-sk", "-H", "X-API-Key: " + KEY,
        "-o", output_path,
        f"{API}/api/v1/file/{file_uuid}/trace/{trace_id}/video?mode=normal&padding=1"
    ]
    result = subprocess.run(cmd, capture_output=True, timeout=60)
    return os.path.exists(output_path)


def extract_frames(video_path, n_frames=1):
    """Extract N evenly-spaced frames from video."""
    cap = cv2.VideoCapture(video_path)
    total = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
    if total == 0:
        cap.release()
        return []
    
    positions = [int(total * 0.5)]  # just middle frame
    if n_frames > 1:
        positions = [int(total * p) for p in [0.2, 0.5, 0.8]]
    
    positions = [max(0, min(p, total - 1)) for p in positions]
    
    frames = []
    for pos in positions:
        cap.set(cv2.CAP_PROP_POS_FRAMES, pos)
        ret, frame = cap.read()
        if ret:
            frames.append(Image.fromarray(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)))
    cap.release()
    return frames


def execute(query, file_uuid):
    """Full execute: type-specific search → download → extract frames."""
    qid = query["id"]
    qtype = query["type"]
    print(f"  [{qid}] ({qtype}) {query['prompt'][:55]}...", end="", flush=True)
    
    # Type-specific search
    trace_id = None
    if qtype == "identity":
        actor = query.get("expected_identity")
        if actor:
            trace_id = find_trace_by_identity(actor, file_uuid)
    elif qtype == "scene":
        start = query.get("cut_start", 0)
        end = query.get("cut_end", 1000000)
        trace_id = find_trace_in_frame_range(start, end, file_uuid)
    elif qtype == "object":
        obj = query.get("expected_object", "")
        trace_id = find_trace_by_object(obj, file_uuid)
    
    if trace_id is None:
        print(" ❌ no trace found")
        return {"query": query, "status": "no_trace", "frames": []}
    
    print(f" trace={trace_id}", end="", flush=True)
    
    # Download video
    vid_path = f"{FRAME_OUTPUT}/{qid}_video.mp4"
    if download_trace_video(file_uuid, trace_id, vid_path):
        size = os.path.getsize(vid_path)
        print(f" ({size//1024}KB)", end="", flush=True)
    else:
        print(" ❌ video dl failed")
        return {"query": query, "status": "no_video", "frames": []}
    
    # Extract frames
    frames = extract_frames(vid_path)
    print(f" {len(frames)} frames")
    
    return {
        "query": query,
        "status": "ok",
        "trace_id": trace_id,
        "video_path": vid_path,
        "frames": frames
    }