#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Parameter SpinBox, a custom Qt4 widget
# Copyright (C) 2011-2013 Filipe Coelho <falktx@falktx.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
#
# This program 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 General Public License for more details.
#
# For a full copy of the GNU General Public License see the COPYING file

# ------------------------------------------------------------------------------------------------------------
# Imports (Global)

from PyQt4.QtCore import pyqtSlot, Qt, QTimer, SIGNAL, SLOT
from PyQt4.QtGui import QAbstractSpinBox, QComboBox, QCursor, QDialog, QInputDialog, QMenu, QPainter, QProgressBar, QValidator
from PyQt4.QtGui import QStyleFactory
from math import isnan

# ------------------------------------------------------------------------------------------------------------
# Imports (Custom)

import ui_inputdialog_value

def fix_value(value, minimum, maximum):
    if isnan(value):
        print("Parameter is NaN! - %f" % value)
        return minimum
    elif value < minimum:
        print("Parameter too low! - %f/%f" % (value, minimum))
        return minimum
    elif value > maximum:
        print("Parameter too high! - %f/%f" % (value, maximum))
        return maximum
    else:
        return value

#QPlastiqueStyle = QStyleFactory.create("Plastique")

# ------------------------------------------------------------------------------------------------------------
# Custom InputDialog with Scale Points support

class CustomInputDialog(QDialog, ui_inputdialog_value.Ui_Dialog):
    def __init__(self, parent, label, current, minimum, maximum, step, scalePoints):
        QDialog.__init__(self, parent)
        self.setupUi(self)

        self.label.setText(label)
        self.doubleSpinBox.setMinimum(minimum)
        self.doubleSpinBox.setMaximum(maximum)
        self.doubleSpinBox.setValue(current)
        self.doubleSpinBox.setSingleStep(step)

        self.ret_value = current

        if not scalePoints:
            self.groupBox.setVisible(False)
            self.resize(200, 0)
        else:
            text = "<table>"
            for scalePoint in scalePoints:
                text += "<tr><td align='right'>%f</td><td align='left'> - %s</td></tr>" % (scalePoint['value'], scalePoint['label'])
            text += "</table>"
            self.textBrowser.setText(text)
            self.resize(200, 300)

        self.connect(self, SIGNAL("accepted()"), self.setReturnValue)

    def setReturnValue(self):
        self.ret_value = self.doubleSpinBox.value()

    def done(self, r):
        QDialog.done(self, r)
        self.close()

# ------------------------------------------------------------------------------------------------------------
# Progress-Bar used for ParamSpinBox

class ParamProgressBar(QProgressBar):
    def __init__(self, parent):
        QProgressBar.__init__(self, parent)

        self.m_leftClickDown = False

        self.m_minimum = 0.0
        self.m_maximum = 1.0
        self.m_rvalue  = 0.0

        self.m_label = ""
        self.m_preLabel = " "
        self.m_textCall = None

        self.setMinimum(0)
        self.setMaximum(1000)
        self.setValue(0)
        self.setFormat("(none)")

    def set_minimum(self, value):
        self.m_minimum = value

    def set_maximum(self, value):
        self.m_maximum = value

    def set_value(self, value):
        self.m_rvalue = value
        vper = (value - self.m_minimum) / (self.m_maximum - self.m_minimum)
        self.setValue(vper * 1000)

    def set_label(self, label):
        self.m_label = label.strip()

        if self.m_label == "(coef)":
            self.m_label = ""
            self.m_preLabel = "*"

        self.update()

    def set_text_call(self, textCall):
        self.m_textCall = textCall

    def handleMouseEventPos(self, pos):
        xper = float(pos.x()) / self.width()
        value = xper * (self.m_maximum - self.m_minimum) + self.m_minimum

        if value < self.m_minimum:
            value = self.m_minimum
        elif value > self.m_maximum:
            value = self.m_maximum

        self.emit(SIGNAL("valueChangedFromBar(double)"), value)

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.handleMouseEventPos(event.pos())
            self.m_leftClickDown = True
        else:
            self.m_leftClickDown = False
        QProgressBar.mousePressEvent(self, event)

    def mouseMoveEvent(self, event):
        if self.m_leftClickDown:
            self.handleMouseEventPos(event.pos())
        QProgressBar.mouseMoveEvent(self, event)

    def mouseReleaseEvent(self, event):
        self.m_leftClickDown = False
        QProgressBar.mouseReleaseEvent(self, event)

    def paintEvent(self, event):
        if self.m_textCall:
            self.setFormat("%s %s %s" % (self.m_preLabel, self.m_textCall(), self.m_label))
        else:
            self.setFormat("%s %f %s" % (self.m_preLabel, self.m_rvalue, self.m_label))

        QProgressBar.paintEvent(self, event)

# ------------------------------------------------------------------------------------------------------------
# Special SpinBox used for parameters

class ParamSpinBox(QAbstractSpinBox):
    def __init__(self, parent):
        QAbstractSpinBox.__init__(self, parent)

        self._minimum = 0.0
        self._maximum = 1.0
        self._default = 0.0
        self._value = None
        self._step = 0.0
        self._step_small = 0.0
        self._step_large = 0.0

        self._read_only = False
        self._scalepoints = None
        self._have_scalepoints = False

        self.bar = ParamProgressBar(self)
        self.bar.setContextMenuPolicy(Qt.NoContextMenu)
        self.bar.show()

        self.lineEdit().setVisible(False)

        self.connect(self.bar, SIGNAL("valueChangedFromBar(double)"), self.handleValueChangedFromBar)
        self.connect(self, SIGNAL("customContextMenuRequested(QPoint)"), self.showCustomMenu)

        QTimer.singleShot(0, self, SLOT("slot_updateBarGeometry()"))

    #def force_plastique_style(self):
        #self.setStyle(QPlastiqueStyle)

    def set_minimum(self, value):
        self._minimum = value
        self.bar.set_minimum(value)

    def set_maximum(self, value):
        self._maximum = value
        self.bar.set_maximum(value)

    def set_default(self, value):
        value = fix_value(value, self._minimum, self._maximum)
        self._default = value

    def set_value(self, value, send=True):
        value = fix_value(value, self._minimum, self._maximum)
        if self._value != value:
            self._value = value
            self.bar.set_value(value)

            if self._have_scalepoints:
                self.set_scalepoint_value(value)

            if send:
                self.emit(SIGNAL("valueChanged(double)"), value)

            self.update()

            return True

        else:
            return False

    def set_step(self, value):
        if value == 0.0:
            self._step = 0.001
        else:
            self._step = value

        if self._step_small > value:
            self._step_small = value
        if self._step_large < value:
            self._step_large = value

    def set_step_small(self, value):
        if value == 0.0:
            self._step_small = 0.0001
        elif value > self._step:
            self._step_small = self._step
        else:
            self._step_small = value

    def set_step_large(self, value):
        if value == 0.0:
            self._step_large = 0.1
        elif value < self._step:
            self._step_large = self._step
        else:
            self._step_large = value

    def set_label(self, label):
        self.bar.set_label(label)

    def set_text_call(self, textCall):
        self.bar.set_text_call(textCall)

    def set_read_only(self, yesno):
        self.setButtonSymbols(QAbstractSpinBox.UpDownArrows if yesno else QAbstractSpinBox.NoButtons)
        self._read_only = yesno
        self.setReadOnly(yesno)

    def set_scalepoints(self, scalepoints, use_scalepoints):
        if len(scalepoints) > 0:
            self._scalepoints = scalepoints
            self._have_scalepoints = use_scalepoints

            if use_scalepoints:
                # Hide ProgressBar and create a ComboBox
                self.bar.close()
                self.box = QComboBox(self)
                self.box.setContextMenuPolicy(Qt.NoContextMenu)
                self.box.show()
                self.slot_updateBarGeometry()

                for scalepoint in scalepoints:
                    self.box.addItem("%f - %s" % (scalepoint['value'], scalepoint['label']))

                if self._value != None:
                    self.set_scalepoint_value(self._value)

                self.connect(self.box, SIGNAL("currentIndexChanged(QString)"), self.handleValueChangedFromBox)

        else:
            self._scalepoints = None

    def set_scalepoint_value(self, value):
        value = self.get_nearest_scalepoint(value)
        for i in range(self.box.count()):
            if float(self.box.itemText(i).split(" - ", 1)[0] == value):
                self.box.setCurrentIndex(i)
                break

    def get_nearest_scalepoint(self, real_value):
        final_value = 0.0
        for i in range(len(self._scalepoints)):
            scale_value = self._scalepoints[i]['value']
            if i == 0:
                final_value = scale_value
            else:
                srange1 = abs(real_value - scale_value)
                srange2 = abs(real_value - final_value)

                if srange2 > srange1:
                    final_value = scale_value

        return final_value

    def handleValueChangedFromBar(self, value):
        if self._read_only:
            return

        step = int(0.5 + ((value - self._minimum) / self._step))
        real_value = self._minimum + (step * self._step)

        self.set_value(real_value)

    def handleValueChangedFromBox(self, box_text):
        if self._read_only:
            return

        value = float(box_text.split(" - ", 1)[0])
        last_scale_value = self._scalepoints[len(self._scalepoints) - 1]['value']

        if value == last_scale_value:
            value = self._maximum

        self.set_value(value)

    def showCustomMenu(self, pos):
        menu = QMenu(self)
        act_x_reset = menu.addAction(self.tr("Reset (%f)" % self._default))
        menu.addSeparator()
        act_x_copy = menu.addAction(self.tr("Copy (%f)" % self._value))
        if False and not self._read_only:
            act_x_paste = menu.addAction(self.tr("Paste (%s)" % "TODO"))
        else:
            act_x_paste = menu.addAction(self.tr("Paste"))
            act_x_paste.setEnabled(False)
        menu.addSeparator()
        act_x_set = menu.addAction(self.tr("Set value..."))

        if self._read_only:
            act_x_reset.setEnabled(False)
            act_x_paste.setEnabled(False)
            act_x_set.setEnabled(False)

        # TODO - NOT IMPLEMENTED YET
        act_x_copy.setEnabled(False)

        act_x_sel = menu.exec_(QCursor.pos())

        if act_x_sel == act_x_set:
            dialog = CustomInputDialog(self, self.parent().label.text(), self._value, self._minimum, self._maximum, self._step, self._scalepoints)
            if dialog.exec_():
                value = dialog.ret_value
                self.set_value(value)

        elif act_x_sel == act_x_copy:
            pass

        elif act_x_sel == act_x_paste:
            pass

        elif act_x_sel == act_x_reset:
            self.set_value(self._default)

    def stepBy(self, steps):
        if steps == 0 or self._value == None:
            return

        value = self._value + (steps * self._step)

        if value < self._minimum:
            value = self._minimum
        elif value > self._maximum:
            value = self._maximum

        self.set_value(value)

    def stepEnabled(self):
        if self._read_only or self._value == None:
            return QAbstractSpinBox.StepNone
        elif self._value <= self._minimum:
            return QAbstractSpinBox.StepUpEnabled
        elif self._value >= self._maximum:
            return QAbstractSpinBox.StepDownEnabled
        else:
            return QAbstractSpinBox.StepUpEnabled | QAbstractSpinBox.StepDownEnabled

    def updateAll(self):
        self.update()
        self.bar.update()
        if self._have_scalepoints:
            self.box.update()

    @pyqtSlot()
    def slot_updateBarGeometry(self):
        self.bar.setGeometry(self.lineEdit().geometry())
        if self._have_scalepoints:
            self.box.setGeometry(self.lineEdit().geometry())

    def resizeEvent(self, event):
        QTimer.singleShot(0, self, SLOT("slot_updateBarGeometry()"))
        QAbstractSpinBox.resizeEvent(self, event)