from PyQt5 import QtGui, QtCore, QtWidgets, QtWidgets
from copy import copy
import re
import logging

log = logging.getLogger('base')

EDIT_SIZE_HINT = 70

class RadioSet(QtWidgets.QWidget):
    activated_custom = QtCore.pyqtSignal()

    def __init__(self, choices, orientation='horizontal', parent=None, stretch=None):
        """
        The choices are specified as a list of dictionaries containing:

        * 'label': Shown in the UI
        * 'value': The value returned is selected

        :param choices: List of choices. See description.
        :param orientation: 'horizontal' (default) of 'vertical'.
        :param parent: Qt parent widget.
        :type choices: list
        """
        super(RadioSet, self).__init__(parent)
        self.choices = copy(choices)
        if orientation == 'horizontal':
            layout = QtWidgets.QHBoxLayout()
        else:
            layout = QtWidgets.QVBoxLayout()

        group = QtWidgets.QButtonGroup(self)

        for choice in self.choices:
            choice['radio'] = QtWidgets.QRadioButton(choice['label'])
            group.addButton(choice['radio'])
            layout.addWidget(choice['radio'], stretch=0)
            choice['radio'].toggled.connect(self.on_toggle)

        layout.setContentsMargins(0, 0, 0, 0)

        if stretch is False:
            pass
        else:
            layout.addStretch()

        self.setLayout(layout)

        self.group_toggle_fn = lambda: None

    def on_toggle(self):
        # log.debug("Radio toggled")
        radio = self.sender()
        if radio.isChecked():
            self.group_toggle_fn()
            self.activated_custom.emit()
        return

    def get_value(self):
        for choice in self.choices:
            if choice['radio'].isChecked():
                return choice['value']
        log.error("No button was toggled in RadioSet.")
        return None

    def set_value(self, val):
        for choice in self.choices:
            if choice['value'] == val:
                choice['radio'].setChecked(True)
                return
        log.error("Value given is not part of this RadioSet: %s" % str(val))


# class RadioGroupChoice(QtWidgets.QWidget):
#     def __init__(self, label_1, label_2, to_check, hide_list, show_list, parent=None):
#         """
#         The choices are specified as a list of dictionaries containing:
#
#         * 'label': Shown in the UI
#         * 'value': The value returned is selected
#
#         :param choices: List of choices. See description.
#         :param orientation: 'horizontal' (default) of 'vertical'.
#         :param parent: Qt parent widget.
#         :type choices: list
#         """
#         super().__init__(parent)
#
#         group = QtGui.QButtonGroup(self)
#
#         self.lbl1 = label_1
#         self.lbl2 = label_2
#         self.hide_list = hide_list
#         self.show_list = show_list
#
#         self.btn1 = QtGui.QRadioButton(str(label_1))
#         self.btn2 = QtGui.QRadioButton(str(label_2))
#         group.addButton(self.btn1)
#         group.addButton(self.btn2)
#
#         if to_check == 1:
#             self.btn1.setChecked(True)
#         else:
#             self.btn2.setChecked(True)
#
#         self.btn1.toggled.connect(lambda: self.btn_state(self.btn1))
#         self.btn2.toggled.connect(lambda: self.btn_state(self.btn2))
#
#     def btn_state(self, btn):
#         if btn.text() == self.lbl1:
#             if btn.isChecked() is True:
#                 self.show_widgets(self.show_list)
#                 self.hide_widgets(self.hide_list)
#             else:
#                 self.show_widgets(self.hide_list)
#                 self.hide_widgets(self.show_list)
#
#     def hide_widgets(self, lst):
#         for wgt in lst:
#             wgt.hide()
#
#     def show_widgets(self, lst):
#         for wgt in lst:
#             wgt.show()


class LengthEntry(QtWidgets.QLineEdit):
    def __init__(self, output_units='IN', parent=None):
        super(LengthEntry, self).__init__(parent)

        self.output_units = output_units
        self.format_re = re.compile(r"^([^\s]+)(?:\s([a-zA-Z]+))?$")

        # Unit conversion table OUTPUT-INPUT
        self.scales = {
            'IN': {'IN': 1.0,
                   'MM': 1/25.4},
            'MM': {'IN': 25.4,
                   'MM': 1.0}
        }
        self.readyToEdit = True

    def mousePressEvent(self, e, Parent=None):
        super(LengthEntry, self).mousePressEvent(e)  # required to deselect on 2e click
        if self.readyToEdit:
            self.selectAll()
            self.readyToEdit = False

    def focusOutEvent(self, e):
        super(LengthEntry, self).focusOutEvent(e)  # required to remove cursor on focusOut
        self.deselect()
        self.readyToEdit = True

    def returnPressed(self, *args, **kwargs):
        val = self.get_value()
        if val is not None:
            self.set_text(str(val))
        else:
            log.warning("Could not interpret entry: %s" % self.get_text())

    def get_value(self):
        raw = str(self.text()).strip(' ')
        # match = self.format_re.search(raw)

        try:
            units = raw[-2:]
            units = self.scales[self.output_units][units.upper()]
            value = raw[:-2]
            return float(eval(value))*units
        except IndexError:
            value = raw
            return float(eval(value))
        except KeyError:
            value = raw
            return float(eval(value))
        except:
            log.warning("Could not parse value in entry: %s" % str(raw))
            return None

    def set_value(self, val):
        self.setText(str('%.4f' % val))

    def sizeHint(self):
        default_hint_size = super(LengthEntry, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())


class FloatEntry(QtWidgets.QLineEdit):
    def __init__(self, parent=None):
        super(FloatEntry, self).__init__(parent)
        self.readyToEdit = True

    def mousePressEvent(self, e, Parent=None):
        super(FloatEntry, self).mousePressEvent(e)  # required to deselect on 2e click
        if self.readyToEdit:
            self.selectAll()
            self.readyToEdit = False

    def focusOutEvent(self, e):
        super(FloatEntry, self).focusOutEvent(e)  # required to remove cursor on focusOut
        self.deselect()
        self.readyToEdit = True

    def returnPressed(self, *args, **kwargs):
        val = self.get_value()
        if val is not None:
            self.set_text(str(val))
        else:
            log.warning("Could not interpret entry: %s" % self.text())

    def get_value(self):
        raw = str(self.text()).strip(' ')
        evaled = 0.0

        try:
            evaled = eval(raw)
        except:
            if evaled is not None:
                log.error("Could not evaluate: %s" % str(raw))
            return None

        return float(evaled)

    def set_value(self, val):
        if val is not None:
            self.setText("%.6f" % val)
        else:
            self.setText("")


    def sizeHint(self):
        default_hint_size = super(FloatEntry, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())


class FloatEntry2(QtWidgets.QLineEdit):
    def __init__(self, parent=None):
        super(FloatEntry2, self).__init__(parent)
        self.readyToEdit = True

    def mousePressEvent(self, e, Parent=None):
        super(FloatEntry2, self).mousePressEvent(e)  # required to deselect on 2e click
        if self.readyToEdit:
            self.selectAll()
            self.readyToEdit = False

    def focusOutEvent(self, e):
        super(FloatEntry2, self).focusOutEvent(e)  # required to remove cursor on focusOut
        self.deselect()
        self.readyToEdit = True

    def get_value(self):
        raw = str(self.text()).strip(' ')
        evaled = 0.0
        try:
            evaled = eval(raw)
        except:
            if evaled is not None:
                log.error("Could not evaluate: %s" % str(raw))
            return None

        return float(evaled)

    def set_value(self, val):
        self.setText("%.6f" % val)

    def sizeHint(self):
        default_hint_size = super(FloatEntry2, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())


class IntEntry(QtWidgets.QLineEdit):

    def __init__(self, parent=None, allow_empty=False, empty_val=None):
        super(IntEntry, self).__init__(parent)
        self.allow_empty = allow_empty
        self.empty_val = empty_val
        self.readyToEdit = True

    def mousePressEvent(self, e, Parent=None):
        super(IntEntry, self).mousePressEvent(e)  # required to deselect on 2e click
        if self.readyToEdit:
            self.selectAll()
            self.readyToEdit = False

    def focusOutEvent(self, e):
        super(IntEntry, self).focusOutEvent(e)  # required to remove cursor on focusOut
        self.deselect()
        self.readyToEdit = True

    def get_value(self):

        if self.allow_empty:
            if str(self.text()) == "":
                return self.empty_val
        # make the text() first a float and then int because if text is a float type,
        # the int() can't convert directly a "text float" into a int type.
        ret_val = float(self.text())
        ret_val = int(ret_val)
        return ret_val

    def set_value(self, val):

        if val == self.empty_val and self.allow_empty:
            self.setText("")
            return

        self.setText(str(val))

    def sizeHint(self):
        default_hint_size = super(IntEntry, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())


class FCEntry(QtWidgets.QLineEdit):
    def __init__(self, parent=None):
        super(FCEntry, self).__init__(parent)
        self.readyToEdit = True

    def mousePressEvent(self, e, Parent=None):
        super(FCEntry, self).mousePressEvent(e)  # required to deselect on 2e click
        if self.readyToEdit:
            self.selectAll()
            self.readyToEdit = False

    def focusOutEvent(self, e):
        super(FCEntry, self).focusOutEvent(e)  # required to remove cursor on focusOut
        self.deselect()
        self.readyToEdit = True

    def get_value(self):
        return str(self.text())

    def set_value(self, val):
        self.setText(str(val))

    def sizeHint(self):
        default_hint_size = super(FCEntry, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())


class FCEntry2(FCEntry):
    def __init__(self, parent=None):
        super(FCEntry2, self).__init__(parent)
        self.readyToEdit = True

    def set_value(self, val):
        self.setText('%.5f' % float(val))


class EvalEntry(QtWidgets.QLineEdit):
    def __init__(self, parent=None):
        super(EvalEntry, self).__init__(parent)
        self.readyToEdit = True

    def mousePressEvent(self, e, Parent=None):
        super(EvalEntry, self).mousePressEvent(e)  # required to deselect on 2e click
        if self.readyToEdit:
            self.selectAll()
            self.readyToEdit = False

    def focusOutEvent(self, e):
        super(EvalEntry, self).focusOutEvent(e)  # required to remove cursor on focusOut
        self.deselect()
        self.readyToEdit = True

    def returnPressed(self, *args, **kwargs):
        val = self.get_value()
        if val is not None:
            self.setText(str(val))
        else:
            log.warning("Could not interpret entry: %s" % self.get_text())

    def get_value(self):
        raw = str(self.text()).strip(' ')
        evaled = 0.0
        try:
            evaled = eval(raw)
        except:
            if evaled is not None:
                log.error("Could not evaluate: %s" % str(raw))
            return None
        return evaled

    def set_value(self, val):
        self.setText(str(val))

    def sizeHint(self):
        default_hint_size = super(EvalEntry, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())


class EvalEntry2(QtWidgets.QLineEdit):
    def __init__(self, parent=None):
        super(EvalEntry2, self).__init__(parent)
        self.readyToEdit = True

    def mousePressEvent(self, e, Parent=None):
        super(EvalEntry2, self).mousePressEvent(e)  # required to deselect on 2e click
        if self.readyToEdit:
            self.selectAll()
            self.readyToEdit = False

    def focusOutEvent(self, e):
        super(EvalEntry2, self).focusOutEvent(e)  # required to remove cursor on focusOut
        self.deselect()
        self.readyToEdit = True

    def get_value(self):
        raw = str(self.text()).strip(' ')
        evaled = 0.0
        try:
            evaled = eval(raw)
        except:
            if evaled is not None:
                log.error("Could not evaluate: %s" % str(raw))
            return None
        return evaled

    def set_value(self, val):
        self.setText(str(val))

    def sizeHint(self):
        default_hint_size = super(EvalEntry2, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())


class FCCheckBox(QtWidgets.QCheckBox):
    def __init__(self, label='', parent=None):
        super(FCCheckBox, self).__init__(str(label), parent)

    def get_value(self):
        return self.isChecked()

    def set_value(self, val):
        self.setChecked(val)

    def toggle(self):
        self.set_value(not self.get_value())


class FCTextArea(QtWidgets.QPlainTextEdit):
    def __init__(self, parent=None):
        super(FCTextArea, self).__init__(parent)

    def set_value(self, val):
        self.setPlainText(val)

    def get_value(self):
        return str(self.toPlainText())

    def sizeHint(self):
        default_hint_size = super(FCTextArea, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())


class FCTextAreaRich(QtWidgets.QTextEdit):
    def __init__(self, parent=None):
        super(FCTextAreaRich, self).__init__(parent)

    def set_value(self, val):
        self.setText(val)

    def get_value(self):
        return str(self.toPlainText())

    def sizeHint(self):
        default_hint_size = super(FCTextAreaRich, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())

class FCComboBox(QtWidgets.QComboBox):
    def __init__(self, parent=None):
        super(FCComboBox, self).__init__(parent)
        self.setFocusPolicy(QtCore.Qt.StrongFocus)

    def wheelEvent(self, *args, **kwargs):
        pass

    def get_value(self):
        return str(self.currentText())

    def set_value(self, val):
        self.setCurrentIndex(self.findText(str(val)))


class FCInputDialog(QtWidgets.QInputDialog):
    def __init__(self, parent=None, ok=False, val=None, title=None, text=None, min=None, max=None, decimals=None):
        super(FCInputDialog, self).__init__(parent)
        self.allow_empty = ok
        self.empty_val = val
        if title is None:
            self.title = 'title'
        else:
            self.title = title
        if text is None:
            self.text = 'text'
        else:
            self.text = text
        if min is None:
            self.min = 0
        else:
            self.min = min
        if max is None:
            self.max = 0
        else:
            self.max = max
        if decimals is None:
            self.decimals = 6
        else:
            self.decimals = decimals


    def get_value(self):
        self.val,self.ok = self.getDouble(self, self.title, self.text, min=self.min,
                                                      max=self.max, decimals=self.decimals)
        return [self.val, self.ok]

    # "Transform", "Enter the Angle value:"
    def set_value(self, val):
        pass


class FCButton(QtWidgets.QPushButton):
    def __init__(self, parent=None):
        super(FCButton, self).__init__(parent)

    def get_value(self):
        return self.isChecked()

    def set_value(self, val):
        self.setText(str(val))


class FCTab(QtWidgets.QTabWidget):
    def __init__(self, parent=None):
        super(FCTab, self).__init__(parent)
        self.setTabsClosable(True)
        self.tabCloseRequested.connect(self.closeTab)

    def deleteTab(self, currentIndex):
        widget = self.widget(currentIndex)
        if widget is not None:
            widget.deleteLater()
        self.removeTab(currentIndex)

    def closeTab(self, currentIndex):
        self.removeTab(currentIndex)

    def protectTab(self, currentIndex):
        self.tabBar().setTabButton(currentIndex, QtWidgets.QTabBar.RightSide, None)


class VerticalScrollArea(QtWidgets.QScrollArea):
    """
    This widget extends QtGui.QScrollArea to make a vertical-only
    scroll area that also expands horizontally to accomodate
    its contents.
    """
    def __init__(self, parent=None):
        QtWidgets.QScrollArea.__init__(self, parent=parent)
        self.setWidgetResizable(True)
        self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAsNeeded)

    def eventFilter(self, source, event):
        """
        The event filter gets automatically installed when setWidget()
        is called.

        :param source:
        :param event:
        :return:
        """
        if event.type() == QtCore.QEvent.Resize and source == self.widget():
            # log.debug("VerticalScrollArea: Widget resized:")
            # log.debug(" minimumSizeHint().width() = %d" % self.widget().minimumSizeHint().width())
            # log.debug(" verticalScrollBar().width() = %d" % self.verticalScrollBar().width())

            self.setMinimumWidth(self.widget().sizeHint().width() +
                                 self.verticalScrollBar().sizeHint().width())

            # if self.verticalScrollBar().isVisible():
            #     log.debug(" Scroll bar visible")
            #     self.setMinimumWidth(self.widget().minimumSizeHint().width() +
            #                          self.verticalScrollBar().width())
            # else:
            #     log.debug(" Scroll bar hidden")
            #     self.setMinimumWidth(self.widget().minimumSizeHint().width())
        return QtWidgets.QWidget.eventFilter(self, source, event)


class OptionalInputSection:

    def __init__(self, cb, optinputs, logic=True):
        """
        Associates the a checkbox with a set of inputs.

        :param cb: Checkbox that enables the optional inputs.
        :param optinputs: List of widgets that are optional.
        :param logic: When True the logic is normal, when False the logic is in reverse
        It means that for logic=True, when the checkbox is checked the widgets are Enabled, and
        for logic=False, when the checkbox is checked the widgets are Disabled
        :return:
        """
        assert isinstance(cb, FCCheckBox), \
            "Expected an FCCheckBox, got %s" % type(cb)

        self.cb = cb
        self.optinputs = optinputs
        self.logic = logic

        self.on_cb_change()
        self.cb.stateChanged.connect(self.on_cb_change)

    def on_cb_change(self):

        if self.cb.checkState():
            for widget in self.optinputs:
                if self.logic is True:
                    widget.setEnabled(True)
                else:
                    widget.setEnabled(False)
        else:
            for widget in self.optinputs:
                if self.logic is True:
                    widget.setEnabled(False)
                else:
                    widget.setEnabled(True)


class FCTable(QtWidgets.QTableWidget):
    def __init__(self, parent=None):
        super(FCTable, self).__init__(parent)

    def sizeHint(self):
        default_hint_size = super(FCTable, self).sizeHint()
        return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())

    def getHeight(self):
        height = self.horizontalHeader().height()
        for i in range(self.rowCount()):
            height += self.rowHeight(i)
        return height

    def getWidth(self):
        width = self.verticalHeader().width()
        for i in range(self.columnCount()):
            width += self.columnWidth(i)
        return width

    # color is in format QtGui.Qcolor(r, g, b, alfa) with or without alfa
    def setColortoRow(self, rowIndex, color):
        for j in range(self.columnCount()):
            self.item(rowIndex, j).setBackground(color)

    # if user is clicking an blank area inside the QTableWidget it will deselect currently selected rows
    def mousePressEvent(self, event):
        if self.itemAt(event.pos()) is None:
            self.clearSelection()
        else:
            QtWidgets.QTableWidget.mousePressEvent(self, event)

    def setupContextMenu(self):
        self.setContextMenuPolicy(QtCore.Qt.ActionsContextMenu)

    def addContextMenu(self, entry, call_function, icon=None):
        action_name = str(entry)
        action = QtWidgets.QAction(self)
        action.setText(action_name)
        if icon:
            assert isinstance(icon, QtGui.QIcon), \
                "Expected the argument to be QtGui.QIcon. Instead it is %s" % type(icon)
            action.setIcon(icon)
        self.addAction(action)
        action.triggered.connect(call_function)

class FCSpinner(QtWidgets.QSpinBox):
    def __init__(self, parent=None):
        super(FCSpinner, self).__init__(parent)

    def get_value(self):
        return str(self.value())

    def set_value(self, val):
        try:
            k = int(val)
        except Exception as e:
            raise e
        self.setValue(k)

    # def sizeHint(self):
    #     default_hint_size = super(FCSpinner, self).sizeHint()
    #     return QtCore.QSize(EDIT_SIZE_HINT, default_hint_size.height())

class Dialog_box(QtWidgets.QWidget):
    def __init__(self, title=None, label=None):
        """

        :param title: string with the window title
        :param label: string with the message inside the dialog box
        """
        super(Dialog_box, self).__init__()
        self.location = (0, 0)
        self.ok = False

        dialog_box = QtWidgets.QInputDialog()
        dialog_box.setFixedWidth(270)

        self.location, self.ok = dialog_box.getText(self, title, label)