#***************************************************************************
#*                                                                         *
#*   Copyright (c) 2011, 2016                                              *
#*   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
import FreeCAD as App
import FreeCADGui as Gui
from FreeCAD import Base, Vector
import Part
import Units
from PySide import QtGui, QtCore
import PlotAux
import Instance
from shipUtils import Paths
import shipUtils.Units as USys
import shipUtils.Locale as Locale
import Tools


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

    def accept(self):
        if not self.ship:
            return False
        if self.running:
            return
        self.save()

        mw = self.getMainWindow()
        form = mw.findChild(QtGui.QWidget, "TaskPanel")
        form.trim = self.widget(QtGui.QLineEdit, "Trim")
        form.minDraft = self.widget(QtGui.QLineEdit, "MinDraft")
        form.maxDraft = self.widget(QtGui.QLineEdit, "MaxDraft")
        form.nDraft = self.widget(QtGui.QSpinBox, "NDraft")

        trim = Units.parseQuantity(Locale.fromString(form.trim.text()))
        min_draft = Units.parseQuantity(Locale.fromString(form.minDraft.text()))
        max_draft = Units.parseQuantity(Locale.fromString(form.maxDraft.text()))
        n_draft = form.nDraft.value()

        draft = min_draft
        drafts = [draft]
        dDraft = (max_draft - min_draft) / (n_draft - 1)
        for i in range(1, n_draft):
            draft = draft + dDraft
            drafts.append(draft)

        # Get external faces
        self.loop = QtCore.QEventLoop()
        self.timer = QtCore.QTimer()
        self.timer.setSingleShot(True)
        QtCore.QObject.connect(self.timer,
                               QtCore.SIGNAL("timeout()"),
                               self.loop,
                               QtCore.SLOT("quit()"))
        self.running = True
        faces = self.externalFaces(self.ship.Shape)
        if not self.running:
            return False
        if len(faces) == 0:
            msg = QtGui.QApplication.translate(
                "ship_console",
                "Failure detecting external faces from the ship object",
                None)
            App.Console.PrintError(msg + '\n')
            return False
        faces = Part.makeShell(faces)

        # Get the hydrostatics
        msg = QtGui.QApplication.translate(
            "ship_console",
            "Computing hydrostatics",
            None)
        App.Console.PrintMessage(msg + '...\n')
        points = []
        for i in range(len(drafts)):
            App.Console.PrintMessage("\t{} / {}\n".format(i + 1, len(drafts)))
            draft = drafts[i]
            point = Tools.Point(self.ship,
                                faces,
                                draft,
                                trim)
            points.append(point)
            self.timer.start(0.0)
            self.loop.exec_()
            if(not self.running):
                break
        PlotAux.Plot(self.ship, trim, points)
        return True

    def reject(self):
        if not self.ship:
            return False
        if self.running:
            self.running = False
            return
        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 = self.widget(QtGui.QLineEdit, "Trim")
        form.minDraft = self.widget(QtGui.QLineEdit, "MinDraft")
        form.maxDraft = self.widget(QtGui.QLineEdit, "MaxDraft")
        form.nDraft = self.widget(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):
        toplevel = QtGui.qApp.topLevelWidgets()
        for i in toplevel:
            if i.metaObject().className() == "Gui::MainWindow":
                return i
        raise RuntimeError("No main window found")

    def widget(self, class_id, name):
        """Return the selected widget.

        Keyword arguments:
        class_id -- Class identifier
        name -- Name of the widget
        """
        mw = self.getMainWindow()
        form = mw.findChild(QtGui.QWidget, "TaskPanel")
        return form.findChild(class_id, name)

    def initValues(self):
        """ Set initial values for fields
        """
        mw = self.getMainWindow()
        form = mw.findChild(QtGui.QWidget, "TaskPanel")
        form.trim = self.widget(QtGui.QLineEdit, "Trim")
        form.minDraft = self.widget(QtGui.QLineEdit, "MinDraft")
        form.maxDraft = self.widget(QtGui.QLineEdit, "MaxDraft")
        form.nDraft = self.widget(QtGui.QSpinBox, "NDraft")

        selObjs = Gui.Selection.getSelection()
        if not selObjs:
            msg = QtGui.QApplication.translate(
                "ship_console",
                "A ship instance must be selected before using this tool (no"
                " objects selected)",
                None)
            App.Console.PrintError(msg + '\n')
            return True
        for i in range(len(selObjs)):
            obj = selObjs[i]
            props = obj.PropertiesList
            try:
                props.index("IsShip")
            except ValueError:
                continue
            if obj.IsShip:
                if self.ship:
                    msg = QtGui.QApplication.translate(
                        "ship_console",
                        "More than one ship have been selected (the extra"
                        " ships will be ignored)",
                        None)
                    App.Console.PrintWarning(msg + '\n')
                    break
                self.ship = obj

        if not self.ship:
            msg = QtGui.QApplication.translate(
                "ship_console",
                "A ship instance must be selected before using this tool (no"
                " valid ship found at the selected objects)",
                None)
            App.Console.PrintError(msg + '\n')
            return True

        props = self.ship.PropertiesList

        length_format = USys.getLengthFormat()
        angle_format = USys.getAngleFormat()

        try:
            props.index("HydrostaticsTrim")
            form.trim.setText(Locale.toString(angle_format.format(
                self.ship.HydrostaticsTrim.getValueAs(
                    USys.getLengthUnits()).Value)))
        except ValueError:
            form.trim.setText(Locale.toString(angle_format.format(0.0)))

        try:
            props.index("HydrostaticsMinDraft")
            form.minDraft.setText(Locale.toString(length_format.format(
                self.ship.HydrostaticsMinDraft.getValueAs(
                    USys.getLengthUnits()).Value)))
        except ValueError:
            form.minDraft.setText(Locale.toString(length_format.format(
                0.9 * self.ship.Draft.getValueAs(USys.getLengthUnits()).Value)))
        try:
            props.index("HydrostaticsMaxDraft")
            form.maxDraft.setText(Locale.toString(length_format.format(
                self.ship.HydrostaticsMaxDraft.getValueAs(
                    USys.getLengthUnits()).Value)))
        except ValueError:
            form.maxDraft.setText(Locale.toString(length_format.format(
                1.1 * self.ship.Draft.getValueAs(USys.getLengthUnits()).Value)))

        try:
            props.index("HydrostaticsNDraft")
            form.nDraft.setValue(self.ship.HydrostaticsNDraft)
        except ValueError:
            pass

        return False

    def retranslateUi(self):
        """ Set user interface locale strings.
        """
        mw = self.getMainWindow()
        form = mw.findChild(QtGui.QWidget, "TaskPanel")
        form.setWindowTitle(QtGui.QApplication.translate(
            "ship_hydrostatic",
            "Plot hydrostatics",
            None))
        self.widget(QtGui.QLabel, "TrimLabel").setText(
            QtGui.QApplication.translate(
                "ship_hydrostatic",
                "Trim",
                None))
        self.widget(QtGui.QLabel, "MinDraftLabel").setText(
            QtGui.QApplication.translate(
                "ship_hydrostatic",
                "Minimum draft",
                None))
        self.widget(QtGui.QLabel, "MaxDraftLabel").setText(
            QtGui.QApplication.translate(
                "ship_hydrostatic",
                "Maximum draft",
                None))
        self.widget(QtGui.QLabel, "NDraftLabel").setText(
            QtGui.QApplication.translate(
                "ship_hydrostatic",
                "Number of points",
                None))

    def clampLength(self, widget, val_min, val_max, val):
        if val >= val_min and val <= val_max:
            return val
        input_format = USys.getLengthFormat()
        val = min(val_max, max(val_min, val))
        qty = Units.Quantity('{} m'.format(val))
        widget.setText(Locale.toString(input_format.format(
            qty.getValueAs(USys.getLengthUnits()).Value)))
        return val

    def clampAngle(self, widget, val_min, val_max, val):
        if val >= val_min and val <= val_max:
            return val
        input_format = USys.getAngleFormat()
        val = min(val_max, max(val_min, val))
        qty = Units.Quantity('{} deg'.format(val))
        widget.setText(Locale.toString(input_format.format(
            qty.getValueAs(USys.getLengthUnits()).Value)))
        return val

    def onData(self, value):
        """ Method called when input data is changed.
         @param value Changed value.
        """
        if not self.ship:
            return
        mw = self.getMainWindow()
        form = mw.findChild(QtGui.QWidget, "TaskPanel")
        form.trim = self.widget(QtGui.QLineEdit, "Trim")
        form.minDraft = self.widget(QtGui.QLineEdit, "MinDraft")
        form.maxDraft = self.widget(QtGui.QLineEdit, "MaxDraft")

        # Get the values (or fix them in bad setting case)
        try:
            trim = Units.Quantity(Locale.fromString(
                form.trim.text())).getValueAs('deg').Value
        except:
            trim = 0.0
            input_format = USys.getAngleFormat()
            qty = Units.Quantity('{} deg'.format(trim))
            form.trim.setText(Locale.toString(input_format.format(
                qty.getValueAs(USys.getLengthUnits()).Value)))
        try:
            min_draft = Units.Quantity(Locale.fromString(
                form.minDraft.text())).getValueAs('m').Value
        except:
            min_draft = 0.9 * self.ship.Draft.getValueAs('m').Value
            input_format = USys.getLengthFormat()
            qty = Units.Quantity('{} m'.format(min_draft))
            form.minDraft.setText(Locale.toString(input_format.format(
                qty.getValueAs(USys.getLengthUnits()).Value)))
        try:
            max_draft = Units.Quantity(Locale.fromString(
                form.minDraft.text())).getValueAs('m').Value
        except:
            max_draft = 0.9 * self.ship.Draft.getValueAs('m').Value
            input_format = USys.getLengthFormat()
            qty = Units.Quantity('{} m'.format(max_draft))
            form.maxDraft.setText(Locale.toString(input_format.format(
                qty.getValueAs(USys.getLengthUnits()).Value)))

        # Clamp the values to the bounds
        bbox = self.ship.Shape.BoundBox
        draft_min = bbox.ZMin / Units.Metre.Value
        draft_max = bbox.ZMax / Units.Metre.Value
        min_draft = self.clampLength(form.minDraft,
                                     draft_min,
                                     draft_max,
                                     min_draft)
        max_draft = self.clampLength(form.maxDraft,
                                     draft_min,
                                     draft_max,
                                     max_draft)
        trim_min = -180.0
        trim_max = 180.0
        trim = self.clampAngle(form.trim, trim_min, trim_max, trim)

        # Clamp draft values to assert that the minimum value is lower than
        # the maximum one
        min_draft = self.clampLength(form.minDraft,
                                     draft_min,
                                     max_draft,
                                     min_draft)
        max_draft = self.clampLength(form.maxDraft,
                                     min_draft,
                                     draft_max,
                                     max_draft)


    def save(self):
        """ Saves data into ship instance.
        """
        mw = self.getMainWindow()
        form = mw.findChild(QtGui.QWidget, "TaskPanel")
        form.trim = self.widget(QtGui.QLineEdit, "Trim")
        form.minDraft = self.widget(QtGui.QLineEdit, "MinDraft")
        form.maxDraft = self.widget(QtGui.QLineEdit, "MaxDraft")
        form.nDraft = self.widget(QtGui.QSpinBox, "NDraft")

        trim = Units.Quantity(Locale.fromString(
            form.trim.text())).getValueAs('deg').Value
        min_draft = Units.Quantity(Locale.fromString(
            form.minDraft.text())).getValueAs('m').Value
        max_draft = Units.Quantity(Locale.fromString(
            form.maxDraft.text())).getValueAs('m').Value
        n_draft = form.nDraft.value()

        props = self.ship.PropertiesList
        try:
            props.index("HydrostaticsTrim")
        except ValueError:
            tooltip = str(QtGui.QApplication.translate(
                "ship_hydrostatic",
                "Hydrostatics tool trim selected",
                None))
            self.ship.addProperty("App::PropertyAngle",
                                  "HydrostaticsTrim",
                                  "Ship",
                                  tooltip)
        self.ship.HydrostaticsTrim = '{} deg'.format(trim)

        try:
            props.index("HydrostaticsMinDraft")
        except ValueError:
            tooltip = str(QtGui.QApplication.translate(
                "ship_hydrostatic",
                "Hydrostatics tool minimum draft selected [m]",
                None))
            self.ship.addProperty("App::PropertyLength",
                                  "HydrostaticsMinDraft",
                                  "Ship",
                                  tooltip)
        self.ship.HydrostaticsMinDraft = '{} m'.format(min_draft)

        try:
            props.index("HydrostaticsMaxDraft")
        except ValueError:
            tooltip = str(QtGui.QApplication.translate(
                "ship_hydrostatic",
                "Hydrostatics tool maximum draft selected [m]",
                None))
            self.ship.addProperty("App::PropertyLength",
                                  "HydrostaticsMaxDraft",
                                  "Ship",
                                  tooltip)
        self.ship.HydrostaticsMaxDraft = '{} m'.format(max_draft)

        try:
            props.index("HydrostaticsNDraft")
        except ValueError:
            tooltip = str(QtGui.QApplication.translate(
                "ship_hydrostatic",
                "Hydrostatics tool number of points selected",
                None))
            self.ship.addProperty("App::PropertyInteger",
                                  "HydrostaticsNDraft",
                                  "Ship",
                                  tooltip)
        self.ship.HydrostaticsNDraft = form.nDraft.value()

    def lineFaceSection(self, line, surface):
        """ Returns the point of section of a line with a face
        @param line Line object, that can be a curve.
        @param surface Surface object (must be a Part::Shape)
        @return Section points array, [] if line don't cut surface
        """
        result = []
        vertexes = line.Vertexes
        nVertex = len(vertexes)

        section = line.cut(surface)

        points = section.Vertexes
        return points

    def externalFaces(self, shape):
        """ Returns detected external faces.
        @param shape Shape where external faces wanted.
        @return List of external faces detected.
        """
        result = []
        faces = shape.Faces
        bbox = shape.BoundBox
        L = bbox.XMax - bbox.XMin
        B = bbox.YMax - bbox.YMin
        T = bbox.ZMax - bbox.ZMin
        dist = math.sqrt(L*L + B*B + T*T)
        msg = QtGui.QApplication.translate(
            "ship_console",
            "Computing external faces",
            None)
        App.Console.PrintMessage(msg + '...\n')
        # Valid/unvalid faces detection loop
        for i in range(len(faces)):
            App.Console.PrintMessage("\t{} / {}\n".format(i + 1, len(faces)))
            f = faces[i]
            # Create a line normal to surface at middle point
            u = 0.0
            v = 0.0
            try:
                surf = f.Surface
                u = 0.5*(surf.getUKnots()[0]+surf.getUKnots()[-1])
                v = 0.5*(surf.getVKnots()[0]+surf.getVKnots()[-1])
            except:
                cog = f.CenterOfMass
                [u, v] = f.Surface.parameter(cog)
            p0 = f.valueAt(u, v)
            try:
                n = f.normalAt(u, v).normalize()
            except:
                continue
            p1 = p0 + n.multiply(1.5 * dist)
            line = Part.makeLine(p0, p1)
            # Look for faces in front of this
            nPoints = 0
            for j in range(len(faces)):
                f2 = faces[j]
                section = self.lineFaceSection(line, f2)
                if len(section) <= 2:
                    continue
                # Add points discarding start and end
                nPoints = nPoints + len(section) - 2
            # In order to avoid special directions we can modify line
            # normal a little bit.
            angle = 5
            line.rotate(p0, Vector(1, 0, 0), angle)
            line.rotate(p0, Vector(0, 1, 0), angle)
            line.rotate(p0, Vector(0, 0, 1), angle)
            nPoints2 = 0
            for j in range(len(faces)):
                if i == j:
                    continue
                f2 = faces[j]
                section = self.lineFaceSection(line, f2)
                if len(section) <= 2:
                    continue
                # Add points discarding start and end
                nPoints2 = nPoints + len(section) - 2
            # If the number of intersection points is pair, is a
            # external face. So if we found an odd points intersection,
            # face must be discarded.
            if (nPoints % 2) or (nPoints2 % 2):
                continue
            result.append(f)
            self.timer.start(0.0)
            self.loop.exec_()
            if(not self.running):
                break
        return result


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