import asyncio
import os
import sys
import logging

import numpy as np
from quamash import QEventLoop, QtWidgets, QtCore
import pyqtgraph as pg
from sipyco.pipe_ipc import AsyncioChildComm
from sipyco import pyon
 

class SpectrogramItem(pg.ImageItem):
    def __init__(self, freq_sample, freq_base, block_size):
        pg.ImageItem.__init__(self)

        depth = 100
        self.img_array = np.zeros((depth, block_size))

        self.setImage(self.img_array, autoLevels=True)
 
        pos = np.array([0., 1., 0.5, 0.25, 0.75])
        color = np.array([[0,255,255,255], [255,255,0,255], [0,0,0,255], (0, 0, 255, 255), (255, 0, 0, 255)], dtype=np.ubyte)
        cmap = pg.ColorMap(pos, color)
        lut = cmap.getLookupTable(0.0, 1.0, 256)
        self.setLookupTable(lut)

        self.setRect(QtCore.QRectF(0.0, (freq_base-freq_sample/2)/1e6, float(depth), freq_sample/1e6))

    def add_block(self, block):
        self.img_array = np.roll(self.img_array, -1, 0)
        self.img_array[-1:] = np.fft.fftshift(block) 
        self.setImage(self.img_array, autoLevels=True)


class MainWindow(pg.GraphicsWindow):
    def __init__(self, freq_sample, freq_base, block_size):
        pg.GraphicsWindow.__init__(self)
        self.setWindowTitle("NOPTICA Wavemeter")

        self.freq_sample = freq_sample
        self.freq_base = freq_base

        self.text = pg.LabelItem()
        self.addItem(self.text)

        p1 = self.addPlot(row=1, col=0)
        self.beat_spectrum = SpectrogramItem(freq_sample, freq_base, block_size)
        p1.addItem(self.beat_spectrum)

    def update_params(self, peak_freq):
        if peak_freq is None:
            self.text.setText("REF: NO BEAT")
        else:
            self.text.setText("REF: {:.3f}MHz".format((self.freq_base + self.freq_sample*peak_freq)/1e6))


class IPCClient(AsyncioChildComm):
    def set_close_cb(self, close_cb):
        self.close_cb = close_cb

    async def read_pyon(self):
        line = await self.readline()
        return pyon.decode(line.decode())

    async def listen(self, main_window):
        while True:
            obj = await self.read_pyon()
            try:
                action = obj["action"]
                if action == "update_beat_spectrum":
                    main_window.beat_spectrum.add_block(obj["block"])
                    main_window.update_params(obj["peak_freq"])
                if action == "terminate":
                    self.close_cb()
                    return
            except:
                logging.error("error processing parent message",
                              exc_info=True)
                self.close_cb()


def main():
    freq_sample = float(sys.argv[1])
    freq_base = float(sys.argv[2])
    block_size = int(sys.argv[3])

    app = QtWidgets.QApplication([])
    loop = QEventLoop(app)
    asyncio.set_event_loop(loop)

    try:
        ipc = IPCClient(os.getenv("NOPTICA2_IPC"))
        loop.run_until_complete(ipc.connect())
        try:
            main_window = MainWindow(freq_sample, freq_base, block_size)
            main_window.show()
            ipc.set_close_cb(main_window.close)
            asyncio.ensure_future(ipc.listen(main_window))
            loop.run_forever()
        finally:
            ipc.close()
    finally:
        loop.close()


if __name__ == "__main__":
    main()