import sys
import cv2
import numpy as np
import multiprocessing
from PyQt5 import QtWidgets, QtGui, QtCore
from PyQt5.QtCore import QTimer
from Detection_window import Ui_MainWindow
from camera.camera_process import CameraProcess

class DetectionApp(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self):
        super(DetectionApp, self).__init__()
        self.setupUi(self)

        # ✅ 先初始化 image_queue，再啟動相機擷取
        self.image_queue = multiprocessing.Queue(maxsize=1)
        self.camera_process = None  # 相機進程尚未啟動

        self.bt_KeepShot.clicked.connect(self.KeepShot)
        self.bt_StopKeepShot.clicked.connect(self.StopKeepShot)

        # ✅ 設定 QTimer，每 100ms 更新影像
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.update_view_origin)
        self.timer.start(100)  # 每 100ms 更新一次影像

    def KeepShot(self):
        """ 啟動相機擷取 """
        if self.camera_process is None or not self.camera_process.is_alive():
            self.StopKeepShot()  # 確保先停止舊的 Process，避免衝突

            # ✅ 重新建立 Queue，避免殘留影像影響新擷取
            self.image_queue = multiprocessing.Queue(maxsize=1)

            # ✅ 確保 `CameraProcess` 是新的
            self.camera_process = CameraProcess(self.image_queue)
            self.camera_process.start()
        else:
            print("相機已經在擷取")

    def StopKeepShot(self):
        """ 停止相機擷取 """
        if self.camera_process and self.camera_process.is_alive():
            self.camera_process.stop()  # 停止擷取
            self.camera_process.join()  # 等待進程完全結束
            self.camera_process = None
            print("已停止影像擷取")

        # ✅ 清空 Queue，確保新擷取不會讀取到舊影像
        while not self.image_queue.empty():
            try:
                self.image_queue.get_nowait()
            except:
                break

    def update_view_origin(self):
        """ 從 Queue 獲取影像並顯示在 QLabel (view_origin) 上 """
        if not self.image_queue.empty():
            image = self.image_queue.get()  # 取得最新影像
            self.display_image(image)

    def display_image(self, image):
        """ 顯示影像到 QLabel (view_origin) """
        image_bgr = cv2.cvtColor(image, cv2.COLOR_BayerBG2BGR) if len(image.shape) == 2 else image
        height, width, channel = image_bgr.shape
        bytes_per_line = 3 * width
        qimage = QtGui.QImage(image_bgr.data, width, height, bytes_per_line, QtGui.QImage.Format_BGR888)
        pixmap = QtGui.QPixmap.fromImage(qimage).scaled(self.view_origin.size(), QtCore.Qt.KeepAspectRatio)
        self.view_origin.setPixmap(pixmap)

    def closeEvent(self, event):
        """ 確保程式關閉時正確停止相機擷取進程 """
        self.StopKeepShot()  # 確保關閉程式時停止相機擷取
        event.accept()  # ✅ 允許視窗關閉


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    window = DetectionApp()
    window.show()
    sys.exit(app.exec_())