#***************************************************************************
#*                                                                         *
#*   Copyright (c) 2011, 2012                                              *  
#*   Jose Luis Cercos Pita <jlcercos@gmail.com>                            *  
#*                                                                         *
#*   This program is free software; you can redistribute it and/or modify  *
#*   it under the terms of the GNU Lesser General Public License (LGPL)    *
#*   as published by the Free Software Foundation; either version 2 of     *
#*   the License, or (at your option) any later version.                   *
#*   for detail see the LICENCE text file.                                 *
#*                                                                         *
#*   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 Library General Public License for more details.                  *
#*                                                                         *
#*   You should have received a copy of the GNU Library General Public     *
#*   License along with this program; if not, write to the Free Software   *
#*   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
#*   USA                                                                   *
#*                                                                         *
#***************************************************************************

import math
# FreeCAD modules
import FreeCAD as App
import FreeCADGui as Gui
# Qt library
from PyQt4 import QtGui,QtCore
# Module
import Plot
import Instance
from shipUtils import Paths, Translator
import Tools

class TaskPanel:
    def __init__(self):
        self.ui = Paths.modulePath() + "/shipHydrostatics/TaskPanel.ui"
        self.ship = None

    def accept(self):
        if not self.ship:
            return False
        self.save()
        draft  = self.form.minDraft.value()
        drafts = [draft]
        dDraft = (self.form.maxDraft.value() - self.form.minDraft.value())/self.form.nDraft.value()
        for i in range(1,self.form.nDraft.value()):
            draft = draft + dDraft
            drafts.append(draft)
        Plot.Plot(self.ship, self.form.trim.value(), drafts)
        return True

    def reject(self):
        return True

    def clicked(self, index):
        pass

    def open(self):
        pass

    def needsFullSpace(self):
        return True

    def isAllowedAlterSelection(self):
        return False

    def isAllowedAlterView(self):
        return True

    def isAllowedAlterDocument(self):
        return False

    def helpRequested(self):
        pass

    def setupUi(self):
        mw = self.getMainWindow()
        form = mw.findChild(QtGui.QWidget, "TaskPanel")
        form.trim = form.findChild(QtGui.QDoubleSpinBox, "Trim")
        form.minDraft = form.findChild(QtGui.QDoubleSpinBox, "MinDraft")
        form.maxDraft = form.findChild(QtGui.QDoubleSpinBox, "MaxDraft")
        form.nDraft = form.findChild(QtGui.QSpinBox, "NDraft")
        self.form = form
        # Initial values
        if self.initValues():
            return True
        self.retranslateUi()
        # Connect Signals and Slots
        QtCore.QObject.connect(form.trim, QtCore.SIGNAL("valueChanged(double)"), self.onData)
        QtCore.QObject.connect(form.minDraft, QtCore.SIGNAL("valueChanged(double)"), self.onData)
        QtCore.QObject.connect(form.maxDraft, QtCore.SIGNAL("valueChanged(double)"), self.onData)

    def getMainWindow(self):
        "returns the main window"
        # using QtGui.qApp.activeWindow() isn't very reliable because if another
        # widget than the mainwindow is active (e.g. a dialog) the wrong widget is
        # returned
        toplevel = QtGui.qApp.topLevelWidgets()
        for i in toplevel:
            if i.metaObject().className() == "Gui::MainWindow":
                return i
        raise Exception("No main window found")

    def initValues(self):
        """ Set initial values for fields
        """
        # Get objects
        selObjs  = Gui.Selection.getSelection()
        if not selObjs:
            msg = Translator.translate("Ship instance must be selected (no object selected)\n")
            App.Console.PrintError(msg)
            return True
        for i in range(0,len(selObjs)):
            obj = selObjs[i]
            # Test if is a ship instance
            props = obj.PropertiesList
            try:
                props.index("IsShip")
            except ValueError:
                continue
            if obj.IsShip:
                # Test if another ship already selected
                if self.ship:
                    msg = Translator.translate("More than one ship selected (extra ship will be neglected)\n")
                    App.Console.PrintWarning(msg)
                    break
                self.ship = obj
        # Test if any valid ship was selected
        if not self.ship:
            msg = Translator.translate("Ship instance must be selected (no valid ship found at selected objects)\n")
            App.Console.PrintError(msg)
            return True
        # Get bounds
        bbox = self.ship.Shape.BoundBox
        # Set trim
        flag = True
        try:
            props.index("HydrostaticsTrim")
        except ValueError:
            flag = False
        if flag:
            self.form.trim.setValue(self.ship.HydrostaticsTrim)
        # Set drafts
        self.form.maxDraft.setValue(1.1*self.ship.Draft)
        self.form.minDraft.setValue(0.9*self.ship.Draft)
        # Try to use saved values
        props = self.ship.PropertiesList
        flag = True
        try:
            props.index("HydrostaticsMinDraft")
        except ValueError:
            flag = False
        if flag:
            self.form.minDraft.setValue(self.ship.HydrostaticsMinDraft)
        flag = True
        try:
            props.index("HydrostaticsMaxDraft")
        except ValueError:
            flag = False
        if flag:
            self.form.maxDraft.setValue(self.ship.HydrostaticsMaxDraft)
        self.form.maxDraft.setMaximum(bbox.ZMax)
        self.form.minDraft.setMinimum(bbox.ZMin)
        self.form.maxDraft.setMinimum(self.form.minDraft.value())
        self.form.minDraft.setMaximum(self.form.maxDraft.value())        
        flag = True
        try:
            props.index("HydrostaticsNDraft")
        except ValueError:
            flag = False
        if flag:
            self.form.nDraft.setValue(self.ship.HydrostaticsNDraft)
        # Update GUI
        msg = Translator.translate("Ready to work\n")
        App.Console.PrintMessage(msg)
        return False

    def retranslateUi(self):
        """ Set user interface locale strings. 
        """
        self.form.setWindowTitle(Translator.translate("Plot hydrostatics"))
        self.form.findChild(QtGui.QLabel, "TrimLabel").setText(Translator.translate("Trim"))
        self.form.findChild(QtGui.QLabel, "MinDraftLabel").setText(Translator.translate("Minimum draft"))
        self.form.findChild(QtGui.QLabel, "MaxDraftLabel").setText(Translator.translate("Maximum draft"))
        self.form.findChild(QtGui.QLabel, "NDraftLabel").setText(Translator.translate("Number of points"))

    def onData(self, value):
        """ Method called when input data is changed.
         @param value Changed value.
        """
        if not self.ship:
            return
        self.form.maxDraft.setMinimum(self.form.minDraft.value())
        self.form.minDraft.setMaximum(self.form.maxDraft.value())        

    def save(self):
        """ Saves data into ship instance.
        """
        props = self.ship.PropertiesList
        try:
            props.index("HydrostaticsTrim")
        except ValueError:
            self.ship.addProperty("App::PropertyFloat","HydrostaticsTrim","Ship", str(Translator.translate("Hydrostatics trim selected [m]")))
        self.ship.HydrostaticsTrim = self.form.trim.value()
        try:
            props.index("HydrostaticsMinDraft")
        except ValueError:
            self.ship.addProperty("App::PropertyFloat","HydrostaticsMinDraft","Ship", str(Translator.translate("Hydrostatics minimum draft selected [m]")))
        self.ship.HydrostaticsMinDraft = self.form.minDraft.value()
        try:
            props.index("HydrostaticsMaxDraft")
        except ValueError:
            self.ship.addProperty("App::PropertyFloat","HydrostaticsMaxDraft","Ship", str(Translator.translate("Hydrostatics maximum draft selected [m]")))
        self.ship.HydrostaticsMaxDraft = self.form.maxDraft.value()
        try:
            props.index("HydrostaticsNDraft")
        except ValueError:
            self.ship.addProperty("App::PropertyInteger","HydrostaticsNDraft","Ship", str(Translator.translate("Hydrostatics number of points selected [m]")))
        self.ship.HydrostaticsNDraft = self.form.nDraft.value()

def createTask():
    panel = TaskPanel()
    Gui.Control.showDialog(panel)
    if panel.setupUi():
        Gui.Control.closeDialog(panel)
        return None
    return panel