#!/usr/bin/env python

# ###########################################################################
#
# This file is part of Taurus
#
# http://taurus-scada.org
#
# Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
#
# Taurus is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Taurus is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Taurus.  If not, see <http://www.gnu.org/licenses/>.
#
# ###########################################################################

"""
RawDataChooser.py:  widget for importing RawData (from file or from a function)
"""


import numpy

from taurus.external.qt import Qt
from taurus.core.util.safeeval import SafeEvaluator
from taurus.qt.qtgui.util.ui import UILoadable


@UILoadable
class QRawDataWidget(Qt.QWidget):

    ReadFromFiles = Qt.pyqtSignal(int, int)
    AddCurve = Qt.pyqtSignal(dict)

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

        # connecttions
        self.openFilesBT.clicked.connect(self.onOpenFilesButtonClicked)
        self.addCurveBT.clicked.connect(self.onAddCurveButtonClicked)

        # set validators in LE's
        self.xFromLE.setValidator(Qt.QDoubleValidator(self))
        self.xToLE.setValidator(Qt.QDoubleValidator(self))
        self.xStepLE.setValidator(Qt.QDoubleValidator(self))

    def onOpenFilesButtonClicked(self):
        """Emit a ReadFromFiles signal with the selected xcol and skiprows as
        parameters"""
        xcol = self.xcolSB.value()
        if xcol == self.xcolSB.minimum():
            xcol = None
        skiprows = self.headerSB.value()
        self.ReadFromFiles.emit(xcol, skiprows)

    def onAddCurveButtonClicked(self):
        """Emit a AddCurve signal with a rawdata dictionary as a parameter.
        The rawdata dictionary is prepared from the from the GUI's selection.
        """
        rawdata = {}
        if self.xRangeRB.isChecked():
            rawdata["x"] = numpy.arange(
                float(self.xFromLE.text()),
                float(self.xToLE.text()),
                float(self.xStepLE.text()),
            )
        else:
            sev = SafeEvaluator()
            try:
                rawdata["x"] = sev.eval(str(self.xValuesLE.text()))
            except Exception:
                Qt.QMessageBox.warning(
                    self,
                    "Invalid x values",
                    "Cannot interpret the x values."
                    + "\n Use Python expressions like"
                    + '"[1, 3 , 67]" or "arange(100)")',
                )
                return
        rawdata["f(x)"] = str(self.f_xLE.text())
        self.AddCurve.emit(rawdata)


if __name__ == "__main__":
    import sys
    from taurus.qt.qtgui.application import TaurusApplication

    app = TaurusApplication(sys.argv, cmd_line_parser=None)
    form = QRawDataWidget()
    form.show()
    sys.exit(app.exec_())
