#############################################################################
##
## Copyright (C) 2022 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of The Qt Company Ltd nor the names of its
##     contributors may be used to endorse or promote products derived
##     from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################

import numpy as np
import math
from pathlib import Path

from PySide6.QtCore import (QAbstractTableModel, QByteArray, QModelIndex,
                            QObject, Qt, Slot)
from PySide6.QtDataVisualization import (Q3DTheme, QAbstract3DGraph,
                                         QHeightMapSurfaceDataProxy,
                                         QSurface3DSeries,
                                         QItemModelSurfaceDataProxy,
                                         QValue3DAxis)
from PySide6.QtGui import QImage, QLinearGradient
from PySide6.QtWidgets import QSlider

SAMPLE_COUNT_X = 50
SAMPLE_COUNT_Z = 50
HEIGHT_MAP_GRID_STEP_X = 6
HEIGHT_MAP_GRID_STEP_Z = 6
SAMPLE_MIN = -8.0
SAMPLE_MAX = 8.0


X_ROLE = Qt.UserRole + 1
Y_ROLE = Qt.UserRole + 2
Z_ROLE = Qt.UserRole + 3


class SqrtSinModel(QAbstractTableModel):
    def __init__(self, parent=None):
        super().__init__(parent)

        self._x = np.zeros(SAMPLE_COUNT_X)
        self._z = np.zeros(SAMPLE_COUNT_Z)
        self._data = np.zeros((SAMPLE_COUNT_Z, SAMPLE_COUNT_X))

        step_x = (SAMPLE_MAX - SAMPLE_MIN) / float(SAMPLE_COUNT_X - 1)
        step_z = (SAMPLE_MAX - SAMPLE_MIN) / float(SAMPLE_COUNT_Z - 1)

        for i in range(SAMPLE_COUNT_Z):
            # Keep values within range bounds, since just adding step can cause
            # minor drift due to the rounding errors.
            z = min(SAMPLE_MAX, (i * step_z + SAMPLE_MIN))
            self._z[i] = z
            for j in range(SAMPLE_COUNT_X):
                x = min(SAMPLE_MAX, (j * step_x + SAMPLE_MIN))
                self._x[j] = x
                R = math.sqrt(z * z + x * x) + 0.01
                y = (math.sin(R) / R + 0.24) * 1.61
                self._data[i, j] = y

    def roleNames(self):
        result = super().roleNames()
        result[X_ROLE] = QByteArray(b"x")
        result[Y_ROLE] = QByteArray(b"y")
        result[Z_ROLE] = QByteArray(b"z")
        return result

    def rowCount(self, index=QModelIndex()):
        return self._z.size

    def columnCount(self, index=QModelIndex()):
        return self._x.size

    def data(self, index, role=Qt.DisplayRole):
        row = index.row()
        col = index.column()
        if role == X_ROLE:
            return float(self._x[col])
        if role == Y_ROLE:
            return float(self._data[row][col])
        if role == Z_ROLE:
            return float(self._z[row])
        return 0.0


class SurfaceGraph(QObject):
    def __init__(self, surface, parent=None):
        super().__init__(parent)

        self.m_graph = surface
        self.m_graph.setAxisX(QValue3DAxis())
        self.m_graph.setAxisY(QValue3DAxis())
        self.m_graph.setAxisZ(QValue3DAxis())

        self.m_sqrtSinModel = SqrtSinModel(self)
        self.m_sqrtSinProxy = QItemModelSurfaceDataProxy(self.m_sqrtSinModel, self)
        self.m_sqrtSinProxy.setUseModelCategories(True)
        self.m_sqrtSinProxy.setXPosRole("x")
        self.m_sqrtSinProxy.setYPosRole("y")
        self.m_sqrtSinProxy.setZPosRole("z")

        self.m_sqrtSinSeries = QSurface3DSeries(self.m_sqrtSinProxy)

        image_file = Path(__file__).parent.parent / "surface" / "mountain.png"
        height_map_image = QImage(image_file)
        self.m_heightMapProxy = QHeightMapSurfaceDataProxy(height_map_image)
        self.m_heightMapSeries = QSurface3DSeries(self.m_heightMapProxy)
        self.m_heightMapSeries.setItemLabelFormat("(@xLabel, @zLabel): @yLabel")
        self.m_heightMapProxy.setValueRanges(34.0, 40.0, 18.0, 24.0)

        self.m_heightMapWidth = height_map_image.width()
        self.m_heightMapHeight = height_map_image.height()

        self.m_axisMinSliderX = QSlider()
        self.m_axisMaxSliderX = QSlider()
        self.m_axisMinSliderZ = QSlider()
        self.m_axisMaxSliderZ = QSlider()
        self.m_rangeMinX = 0.0
        self.m_rangeMinZ = 0.0
        self.m_stepX = 0.0
        self.m_stepZ = 0.0

    @Slot(bool)
    def enable_sqrt_sin_model(self, enable):
        if enable:
            self.m_sqrtSinSeries.setDrawMode(QSurface3DSeries.DrawSurfaceAndWireframe)
            self.m_sqrtSinSeries.setFlatShadingEnabled(True)

            self.m_graph.axisX().setLabelFormat("%.2f")
            self.m_graph.axisZ().setLabelFormat("%.2f")
            self.m_graph.axisX().setRange(SAMPLE_MIN, SAMPLE_MAX)
            self.m_graph.axisY().setRange(0.0, 2.0)
            self.m_graph.axisZ().setRange(SAMPLE_MIN, SAMPLE_MAX)
            self.m_graph.axisX().setLabelAutoRotation(30)
            self.m_graph.axisY().setLabelAutoRotation(90)
            self.m_graph.axisZ().setLabelAutoRotation(30)

            self.m_graph.removeSeries(self.m_heightMapSeries)
            self.m_graph.addSeries(self.m_sqrtSinSeries)

            # Reset range sliders for Sqrt&Sin
            self.m_rangeMinX = SAMPLE_MIN
            self.m_rangeMinZ = SAMPLE_MIN
            self.m_stepX = (SAMPLE_MAX - SAMPLE_MIN) / float(SAMPLE_COUNT_X - 1)
            self.m_stepZ = (SAMPLE_MAX - SAMPLE_MIN) / float(SAMPLE_COUNT_Z - 1)
            self.m_axisMinSliderX.setMaximum(SAMPLE_COUNT_X - 2)
            self.m_axisMinSliderX.setValue(0)
            self.m_axisMaxSliderX.setMaximum(SAMPLE_COUNT_X - 1)
            self.m_axisMaxSliderX.setValue(SAMPLE_COUNT_X - 1)
            self.m_axisMinSliderZ.setMaximum(SAMPLE_COUNT_Z - 2)
            self.m_axisMinSliderZ.setValue(0)
            self.m_axisMaxSliderZ.setMaximum(SAMPLE_COUNT_Z - 1)
            self.m_axisMaxSliderZ.setValue(SAMPLE_COUNT_Z - 1)

    @Slot(bool)
    def enable_height_map_model(self, enable):
        if enable:
            self.m_heightMapSeries.setDrawMode(QSurface3DSeries.DrawSurface)
            self.m_heightMapSeries.setFlatShadingEnabled(False)

            self.m_graph.axisX().setLabelFormat("%.1f N")
            self.m_graph.axisZ().setLabelFormat("%.1f E")
            self.m_graph.axisX().setRange(34.0, 40.0)
            self.m_graph.axisY().setAutoAdjustRange(True)
            self.m_graph.axisZ().setRange(18.0, 24.0)

            self.m_graph.axisX().setTitle("Latitude")
            self.m_graph.axisY().setTitle("Height")
            self.m_graph.axisZ().setTitle("Longitude")

            self.m_graph.removeSeries(self.m_sqrtSinSeries)
            self.m_graph.addSeries(self.m_heightMapSeries)

            # Reset range sliders for height map
            map_grid_count_x = self.m_heightMapWidth / HEIGHT_MAP_GRID_STEP_X
            map_grid_count_z = self.m_heightMapHeight / HEIGHT_MAP_GRID_STEP_Z
            self.m_rangeMinX = 34.0
            self.m_rangeMinZ = 18.0
            self.m_stepX = 6.0 / float(map_grid_count_x - 1)
            self.m_stepZ = 6.0 / float(map_grid_count_z - 1)
            self.m_axisMinSliderX.setMaximum(map_grid_count_x - 2)
            self.m_axisMinSliderX.setValue(0)
            self.m_axisMaxSliderX.setMaximum(map_grid_count_x - 1)
            self.m_axisMaxSliderX.setValue(map_grid_count_x - 1)
            self.m_axisMinSliderZ.setMaximum(map_grid_count_z - 2)
            self.m_axisMinSliderZ.setValue(0)
            self.m_axisMaxSliderZ.setMaximum(map_grid_count_z - 1)
            self.m_axisMaxSliderZ.setValue(map_grid_count_z - 1)

    @Slot(int)
    def adjust_xmin(self, minimum):
        min_x = self.m_stepX * float(minimum) + self.m_rangeMinX

        maximum = self.m_axisMaxSliderX.value()
        if minimum >= maximum:
            maximum = minimum + 1
            self.m_axisMaxSliderX.setValue(maximum)
        max_x = self.m_stepX * maximum + self.m_rangeMinX

        self.set_axis_xrange(min_x, max_x)

    @Slot(int)
    def adjust_xmax(self, maximum):
        max_x = self.m_stepX * float(maximum) + self.m_rangeMinX

        minimum = self.m_axisMinSliderX.value()
        if maximum <= minimum:
            minimum = maximum - 1
            self.m_axisMinSliderX.setValue(minimum)
        min_x = self.m_stepX * minimum + self.m_rangeMinX

        self.set_axis_xrange(min_x, max_x)

    @Slot(int)
    def adjust_zmin(self, minimum):
        min_z = self.m_stepZ * float(minimum) + self.m_rangeMinZ

        maximum = self.m_axisMaxSliderZ.value()
        if minimum >= maximum:
            maximum = minimum + 1
            self.m_axisMaxSliderZ.setValue(maximum)
        max_z = self.m_stepZ * maximum + self.m_rangeMinZ

        self.set_axis_zrange(min_z, max_z)

    @Slot(int)
    def adjust_zmax(self, maximum):
        max_x = self.m_stepZ * float(maximum) + self.m_rangeMinZ

        minimum = self.m_axisMinSliderZ.value()
        if maximum <= minimum:
            minimum = maximum - 1
            self.m_axisMinSliderZ.setValue(minimum)
        min_x = self.m_stepZ * minimum + self.m_rangeMinZ

        self.set_axis_zrange(min_x, max_x)

    def set_axis_xrange(self, minimum, maximum):
        self.m_graph.axisX().setRange(minimum, maximum)

    def set_axis_zrange(self, minimum, maximum):
        self.m_graph.axisZ().setRange(minimum, maximum)

    @Slot(int)
    def change_theme(self, theme):
        self.m_graph.activeTheme().setType(Q3DTheme.Theme(theme))

    @Slot()
    def set_black_to_yellow_gradient(self):
        gr = QLinearGradient()
        gr.setColorAt(0.0, Qt.black)
        gr.setColorAt(0.33, Qt.blue)
        gr.setColorAt(0.67, Qt.red)
        gr.setColorAt(1.0, Qt.yellow)

        series = self.m_graph.seriesList()[0]
        series.setBaseGradient(gr)
        series.setColorStyle(Q3DTheme.ColorStyleRangeGradient)

    @Slot()
    def set_green_to_red_gradient(self):
        gr = QLinearGradient()
        gr.setColorAt(0.0, Qt.darkGreen)
        gr.setColorAt(0.5, Qt.yellow)
        gr.setColorAt(0.8, Qt.red)
        gr.setColorAt(1.0, Qt.darkRed)

        series = self.m_graph.seriesList()[0]
        series.setBaseGradient(gr)
        series.setColorStyle(Q3DTheme.ColorStyleRangeGradient)

    @Slot()
    def toggle_mode_none(self):
        self.m_graph.setSelectionMode(QAbstract3DGraph.SelectionNone)

    @Slot()
    def toggle_mode_item(self):
        self.m_graph.setSelectionMode(QAbstract3DGraph.SelectionItem)

    @Slot()
    def toggle_mode_slice_row(self):
        self.m_graph.setSelectionMode(
            QAbstract3DGraph.SelectionItemAndRow | QAbstract3DGraph.SelectionSlice
        )

    @Slot()
    def toggle_mode_slice_column(self):
        self.m_graph.setSelectionMode(
            QAbstract3DGraph.SelectionItemAndColumn | QAbstract3DGraph.SelectionSlice
        )

    def set_axis_min_slider_x(self, slider):
        self.m_axisMinSliderX = slider

    def set_axis_max_slider_x(self, slider):
        self.m_axisMaxSliderX = slider

    def set_axis_min_slider_z(self, slider):
        self.m_axisMinSliderZ = slider

    def set_axis_max_slider_z(self, slider):
        self.m_axisMaxSliderZ = slider
