import csv
import json
import os
import threading
import time
import uuid

import pytest

RESULTS_DIR = os.environ.get("RESULTS_DIR", "/results")


def _base_ai_body(video_path: str) -> dict:
    return {
        "probability_threshold": 0.25,
        "frame_period_recognition": 4,
        "frame_recognition_seconds": 2,
        "tracking_distance_confidence": 0.0,
        "tracking_probability_increase": 0.0,
        "tracking_intersection_threshold": 0.6,
        "altitude": 400.0,
        "focal_length": 24.0,
        "sensor_width": 23.5,
        "paths": [video_path],
    }


def _save_events_csv(video_path: str, events: list[dict]):
    stem = os.path.splitext(os.path.basename(video_path))[0]
    path = os.path.join(RESULTS_DIR, f"{stem}_detections.csv")
    rows = []
    for ev in events:
        base = {
            "mediaId": ev.get("mediaId", ""),
            "mediaStatus": ev.get("mediaStatus", ""),
            "mediaPercent": ev.get("mediaPercent", ""),
        }
        anns = ev.get("annotations") or []
        if anns:
            for det in anns:
                rows.append({**base, **det})
        else:
            rows.append(base)
    if not rows:
        return
    fieldnames = list(rows[0].keys())
    for r in rows[1:]:
        for k in r:
            if k not in fieldnames:
                fieldnames.append(k)
    with open(path, "w", newline="") as f:
        writer = csv.DictWriter(f, fieldnames=fieldnames, extrasaction="ignore")
        writer.writeheader()
        writer.writerows(rows)


def _run_async_video_sse(
    http_client,
    jwt_token,
    sse_client_factory,
    media_id: str,
    body: dict,
    *,
    timed: bool = False,
    wait_s: float = 900.0,
):
    video_path = (body.get("paths") or [""])[0]
    collected: list = []
    raw_events: list[dict] = []
    thread_exc: list[BaseException] = []
    done = threading.Event()

    def _listen():
        try:
            with sse_client_factory() as sse:
                time.sleep(0.3)
                for event in sse.events():
                    if not event.data or not str(event.data).strip():
                        continue
                    data = json.loads(event.data)
                    if data.get("mediaId") != media_id:
                        continue
                    raw_events.append(data)
                    if timed:
                        collected.append((time.monotonic(), data))
                    else:
                        collected.append(data)
                    if (
                        data.get("mediaStatus") == "AIProcessed"
                        and data.get("mediaPercent") == 100
                    ):
                        break
        except BaseException as e:
            thread_exc.append(e)
        finally:
            if video_path and raw_events:
                try:
                    _save_events_csv(video_path, raw_events)
                except Exception:
                    pass
            done.set()

    th = threading.Thread(target=_listen, daemon=True)
    th.start()
    time.sleep(0.5)
    r = http_client.post(
        f"/detect/{media_id}",
        json=body,
        headers={"Authorization": f"Bearer {jwt_token}"},
    )
    assert r.status_code == 200
    assert r.json() == {"status": "started", "mediaId": media_id}
    assert done.wait(timeout=wait_s)
    th.join(timeout=5)
    assert not thread_exc, thread_exc
    return collected


def _assert_detection_dto(d: dict) -> None:
    assert isinstance(d["centerX"], (int, float))
    assert isinstance(d["centerY"], (int, float))
    assert isinstance(d["width"], (int, float))
    assert isinstance(d["height"], (int, float))
    assert 0.0 <= float(d["centerX"]) <= 1.0
    assert 0.0 <= float(d["centerY"]) <= 1.0
    assert 0.0 <= float(d["width"]) <= 1.0
    assert 0.0 <= float(d["height"]) <= 1.0
    assert isinstance(d["classNum"], int)
    assert isinstance(d["label"], str)
    assert isinstance(d["confidence"], (int, float))
    assert 0.0 <= float(d["confidence"]) <= 1.0


@pytest.mark.slow
@pytest.mark.timeout(900)
def test_ft_p_10_frame_sampling_ac1(
    warm_engine,
    http_client,
    jwt_token,
    video_short_path,
    sse_client_factory,
):
    media_id = f"video-{uuid.uuid4().hex}"
    body = _base_ai_body(video_short_path)
    body["frame_period_recognition"] = 4
    collected = _run_async_video_sse(
        http_client,
        jwt_token,
        sse_client_factory,
        media_id,
        body,
    )
    processing = [e for e in collected if e.get("mediaStatus") == "AIProcessing"]
    assert len(processing) >= 2
    final = collected[-1]
    assert final.get("mediaStatus") == "AIProcessed"
    assert final.get("mediaPercent") == 100


@pytest.mark.slow
@pytest.mark.timeout(900)
def test_ft_p_11_annotation_interval_ac2(
    warm_engine,
    http_client,
    jwt_token,
    video_short_path,
    sse_client_factory,
):
    media_id = f"video-{uuid.uuid4().hex}"
    body = _base_ai_body(video_short_path)
    body["frame_recognition_seconds"] = 2
    collected = _run_async_video_sse(
        http_client,
        jwt_token,
        sse_client_factory,
        media_id,
        body,
        timed=True,
    )
    processing = [
        (t, d) for t, d in collected if d.get("mediaStatus") == "AIProcessing"
    ]
    assert len(processing) >= 2
    gaps = [
        processing[i][0] - processing[i - 1][0]
        for i in range(1, len(processing))
    ]
    assert all(g >= 0.0 for g in gaps)
    final = collected[-1][1]
    assert final.get("mediaStatus") == "AIProcessed"
    assert final.get("mediaPercent") == 100


@pytest.mark.slow
@pytest.mark.timeout(900)
def test_ft_p_12_movement_tracking_ac3(
    warm_engine,
    http_client,
    jwt_token,
    video_short_path,
    sse_client_factory,
):
    media_id = f"video-{uuid.uuid4().hex}"
    body = _base_ai_body(video_short_path)
    body["tracking_distance_confidence"] = 0.1
    body["tracking_probability_increase"] = 0.1
    collected = _run_async_video_sse(
        http_client,
        jwt_token,
        sse_client_factory,
        media_id,
        body,
    )
    for e in collected:
        anns = e.get("annotations")
        if not anns:
            continue
        assert isinstance(anns, list)
        for d in anns:
            _assert_detection_dto(d)
    final = collected[-1]
    assert final.get("mediaStatus") == "AIProcessed"
    assert final.get("mediaPercent") == 100