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import numpy as np
from PyQt5.QtWidgets import QWidget, QHBoxLayout
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
from matplotlib.widgets import Cursor
from wavepy2.util.plot.plot_tools import WIDGET_FIXED_WIDTH
from wavepy2.util.log.logger import get_registered_logger_instance

class GraphicalSelectPointIdx(QWidget):
    def __init__(self, parent, image, selection_listener, args_for_listener, **kwargs):
        super(GraphicalSelectPointIdx, self).__init__(parent)

        logger = get_registered_logger_instance()

        layout = QHBoxLayout()

        figure_canvas = FigureCanvas(Figure(facecolor="white", figsize=(10, 8)))
        figure = figure_canvas.figure

        ax = figure.subplots()

        surface = ax.imshow(image, cmap='Spectral', **kwargs)
        ax.autoscale(False)

        ax1 = ax.plot(image.shape[1] // 2, image.shape[0] // 2, 'r+', ms=30, picker=10)

        ax.grid()
        ax.set_xlabel('Pixels')
        ax.set_ylabel('Pixels')
        ax.set_title('CHOOSE POINT, Click OK when Done\nRight Click: Select point\n',
                      fontsize=16, color='r', weight='bold')
        figure.colorbar(surface)

        def onclick(event):
            if event.button == 3: # right click
                xo, yo = event.xdata, event.ydata

                logger.print_message('Middle Click: Select point:\tx: {:.0f}, y: {:.0f}'.format(xo, yo))

                ax1[0].set_xdata(xo)
                ax1[0].set_ydata(yo)

                ax.set_title('CHOOSE POINT, Click OK when Done\nRight Click: Select point\n' +
                              'x: {:.0f}, y: {:.0f}'.format(xo, yo),
                              fontsize=16, color='r', weight='bold')

                if np.isnan(xo) or np.isnan(yo): selection_listener(None, None, args_for_listener)
                else: selection_listener(xo, yo, args_for_listener)

                figure.canvas.draw()

        Cursor(ax, useblit=True, color='red', linewidth=2)
        figure.canvas.mpl_connect('button_press_event', onclick)

        layout.addWidget(figure_canvas)

        self.setLayout(layout)
        self.setFixedWidth(WIDGET_FIXED_WIDTH)
