"""Atividade — octaedro como malha triangular indexada.

Aula 07 — Leitura de Objetos e Superfícies Ocultas.

Execute com:

    python octaedro_base.py
"""

from __future__ import annotations

import math
import sys

from PySide6.QtCore import Qt
from PySide6.QtGui import QSurfaceFormat
from PySide6.QtOpenGLWidgets import QOpenGLWidget
from PySide6.QtWidgets import QApplication
from OpenGL.GL import *
from OpenGL.GLU import gluLookAt, gluPerspective

VERTICES = [(0, 1.4, 0), (0, -1.4, 0), (-1, 0, 0), (0, 0, -1), (1, 0, 0), (0, 0, 1)]

# TODO 1: oito triplas de índices, anti-horárias vistas de fora.
FACES = []


CORES = [(0.95, 0.45, 0.25), (0.25, 0.70, 0.95), (0.55, 0.80, 0.30),
         (0.80, 0.40, 0.85), (0.95, 0.75, 0.25), (0.25, 0.75, 0.65),
         (0.65, 0.55, 0.90), (0.85, 0.60, 0.35)]

def normal_face(face):
    # TODO 2: produto vetorial normalizado (b-a) x (c-a).
    return (0.0, 0.0, 0.0)



class Octaedro(QOpenGLWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.angulo = 25.0
        self.setWindowTitle("Octaedro | setas: rotação | Esc: sair")
        self.setFocusPolicy(Qt.FocusPolicy.StrongFocus)

    def initializeGL(self):
        glClearColor(0.08, 0.09, 0.12, 1.0)
        # TODO 3: habilite GL_DEPTH_TEST e GL_CULL_FACE.
        glCullFace(GL_BACK)
        glFrontFace(GL_CCW)

    def resizeGL(self, w, h):
        dpr = self.devicePixelRatioF()
        w, h = max(1, round(w * dpr)), max(1, round(h * dpr))
        glViewport(0, 0, w, h)
        glMatrixMode(GL_PROJECTION); glLoadIdentity()
        gluPerspective(50.0, w / float(h), 0.1, 100.0)
        glMatrixMode(GL_MODELVIEW)

    def paintGL(self):
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
        glLoadIdentity(); gluLookAt(0, 1.8, 5, 0, 0, 0, 0, 1, 0)
        glRotatef(self.angulo, 0, 1, 0)
        # TODO 4: substitua os pontos pelo desenho de FACES em GL_TRIANGLES,
        # usando CORES[numero] para cada face. Não ative iluminação.
        glPointSize(8.0)
        glColor3f(1.0, 0.8, 0.2)
        glBegin(GL_POINTS)
        for vertice in VERTICES:
            glVertex3f(*vertice)
        glEnd()

    def keyPressEvent(self, event):
        if event.key() == Qt.Key.Key_Escape: self.close(); return
        if event.key() == Qt.Key.Key_Left: self.angulo -= 5
        elif event.key() == Qt.Key.Key_Right: self.angulo += 5
        else: return
        self.update()


def main():
    fmt = QSurfaceFormat(); fmt.setVersion(2, 1)
    fmt.setProfile(QSurfaceFormat.OpenGLContextProfile.NoProfile); fmt.setDepthBufferSize(24)
    QSurfaceFormat.setDefaultFormat(fmt)
    app = QApplication(sys.argv); janela = Octaedro(); janela.resize(800, 600); janela.show()
    return app.exec()


if __name__ == "__main__": raise SystemExit(main())