import sys
import os
import time
import logging
from unittest.mock import MagicMock, patch

import pytest

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

import cv2
import numpy as np
from core.stream_manager import encode_mjpeg_frame, StreamManager, CameraStream, generate_mjpeg_stream


def test_encode_mjpeg_frame():
    frame = np.zeros((100, 100, 3), dtype=np.uint8)
    data = encode_mjpeg_frame(frame)
    assert data[:2] == b"\xff\xd8"


def test_stream_manager_register_and_get():
    manager = StreamManager()
    fake_frame = np.zeros((100, 100, 3), dtype=np.uint8)
    try:
        with patch("core.stream_manager.cv2.VideoCapture") as mock_vc:
            mock_cap = MagicMock()
            mock_cap.isOpened.return_value = True
            mock_cap.read.return_value = (True, fake_frame)
            mock_cap.set.return_value = True
            mock_vc.return_value = mock_cap
            stream = manager.register("test", "rtsp://dummy", reconnect_delay=0.01)
            assert stream is not None
            assert manager.get("test") is stream
    finally:
        manager.stop_all()


def test_generate_mjpeg_stream_includes_content_length():
    frame = np.zeros((100, 100, 3), dtype=np.uint8)

    def get_frame():
        return frame

    chunks = []
    for chunk in generate_mjpeg_stream(get_frame, fps=30):
        chunks.append(chunk)
        if len(chunks) >= 3:
            break

    for chunk in chunks:
        assert b"Content-Length:" in chunk
        assert b"Content-Type: image/jpeg" in chunk


def test_stream_manager_stop_all_does_not_crash():
    manager = StreamManager()
    fake_frame = np.zeros((100, 100, 3), dtype=np.uint8)
    try:
        with patch("core.stream_manager.cv2.VideoCapture") as mock_vc:
            mock_cap = MagicMock()
            mock_cap.isOpened.return_value = True
            mock_cap.read.return_value = (True, fake_frame)
            mock_cap.set.return_value = True
            mock_vc.return_value = mock_cap
            manager.register("a", "rtsp://dummy_a", reconnect_delay=0.01)
            manager.register("b", "rtsp://dummy_b", reconnect_delay=0.01)
            # Should stop all streams cleanly even when none have connected.
            manager.stop_all()
    finally:
        manager.stop_all()
    assert manager.get("a") is None
    assert manager.get("b") is None


def test_camera_stream_last_error_initially_none():
    stream = CameraStream("test", "rtsp://dummy")
    assert stream.last_error is None


def test_camera_stream_sets_timeout_properties_when_available():
    if not hasattr(cv2, "CAP_PROP_OPEN_TIMEOUT_MSEC") or not hasattr(cv2, "CAP_PROP_READ_TIMEOUT_MSEC"):
        pytest.skip("OpenCV timeout properties not available on this build")

    fake_frame = np.zeros((100, 100, 3), dtype=np.uint8)
    mock_cap = MagicMock()
    mock_cap.isOpened.return_value = True
    mock_cap.read.side_effect = [(True, fake_frame), (True, fake_frame), (False, None)]
    mock_cap.set.return_value = True

    stream = CameraStream("test", "rtsp://dummy", reconnect_delay=0.01)
    try:
        with patch("core.stream_manager.cv2.VideoCapture", return_value=mock_cap):
            stream.start()
            # Give the worker time to create a capture and set properties.
            time.sleep(0.1)
    finally:
        stream.stop()

    mock_cap.set.assert_any_call(cv2.CAP_PROP_OPEN_TIMEOUT_MSEC, 10000)
    mock_cap.set.assert_any_call(cv2.CAP_PROP_READ_TIMEOUT_MSEC, 10000)


def test_camera_stream_logs_timeout_set_failure(caplog):
    if not hasattr(cv2, "CAP_PROP_OPEN_TIMEOUT_MSEC") or not hasattr(cv2, "CAP_PROP_READ_TIMEOUT_MSEC"):
        pytest.skip("OpenCV timeout properties not available on this build")

    fake_frame = np.zeros((100, 100, 3), dtype=np.uint8)
    mock_cap = MagicMock()
    mock_cap.isOpened.return_value = True
    mock_cap.read.side_effect = [(True, fake_frame), (False, None)]
    mock_cap.set.return_value = False

    stream = CameraStream("test", "rtsp://dummy", reconnect_delay=0.01)
    with caplog.at_level(logging.WARNING, logger="core.stream_manager"):
        try:
            with patch("core.stream_manager.cv2.VideoCapture", return_value=mock_cap):
                stream.start()
                time.sleep(0.1)
        finally:
            stream.stop()

    assert any("CAP_PROP_OPEN_TIMEOUT_MSEC" in rec.message for rec in caplog.records)
    assert any("CAP_PROP_READ_TIMEOUT_MSEC" in rec.message for rec in caplog.records)