# coding: utf-8
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#
# Copyright (c) 2016 European Synchrotron Radiation Facility
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# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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from __future__ import absolute_import

__authors__ = ["V. Valls"]
__license__ = "MIT"
__date__ = "23/01/2018"

from pyFAI.gui import qt
import pyFAI.detectors
from .model.DetectorModel import DetectorModel


class DetectorSelector(qt.QComboBox):

    def __init__(self, parent=None):
        super(DetectorSelector, self).__init__(parent)

        # feed the widget with default detectors
        items = pyFAI.detectors.ALL_DETECTORS.items()
        items = sorted(items)
        for detectorName, detector in items:
            if detector is pyFAI.detectors.Detector:
                continue
            self.addItem(detectorName, detector)

        self.__model = None
        self.setModel(DetectorModel())
        self.currentIndexChanged[int].connect(self.__currentIndexChanged)

    def __currentIndexChanged(self, index):
        model = self.model()
        if model is None:
            return
        detectorClass = self.itemData(index)
        old = self.blockSignals(True)
        model.setDetector(detectorClass())
        self.blockSignals(old)

    def setModel(self, model):
        if self.__model is not None:
            self.__model.changed.disconnect(self.__modelChanged)
        self.__model = model
        if self.__model is not None:
            self.__model.changed.connect(self.__modelChanged)
        self.__modelChanged()

    def findDetectorClass(self, detectorClass):
        """Returns the first index containing the requested detector.
        Else return -1"""
        for index in range(self.count()):
            item = self.itemData(index)
            if item is detectorClass:
                return index
        return -1

    def __modelChanged(self):
        value = self.__model.detector()
        if value is None:
            self.setCurrentIndex(-1)
        else:
            detectorClass = value.__class__
            index = self.currentIndex()
            item = self.itemData(index)
            if item != detectorClass:
                # findData is not working
                index = self.findDetectorClass(detectorClass)
                self.setCurrentIndex(index)

    def model(self):
        return self.__model
