from OCC.Core.BRepBndLib import brepbndlib
from OCC.Core.STEPControl import STEPControl_Reader
from OCC.Core.TopAbs import TopAbs_COMPOUND, TopAbs_SOLID, TopAbs_SHELL
from OCC.Core.TopExp import TopExp_Explorer
from OCC.Display.SimpleGui import init_display
from OCC.Core.Quantity import Quantity_Color, Quantity_NOC_RED
from OCC.Core.Quantity import Quantity_TOC_RGB  # 颜色类型枚举
from OCC.Core.TopAbs import (TopAbs_COMPOUND, TopAbs_SOLID,
                             TopAbs_SHELL, TopAbs_FACE,
                             TopAbs_WIRE, TopAbs_EDGE,
                             TopAbs_VERTEX)
from OCC.Core.Bnd import Bnd_Box
from OCC.Core.gp import gp_Pnt
import numpy as np
from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge
from tqdm import tqdm
class StepParser:
    def __init__(self, stepfile):
        self.stepfile = stepfile

    def analyze_shape(shape):
        """分析形状类型和子组件"""
        shape_type = shape.ShapeType()
        type_names = {
            TopAbs_COMPOUND: "Compound",
            TopAbs_SOLID: "Solid",
            TopAbs_SHELL: "Shell",
            TopAbs_FACE: "Face",
            TopAbs_WIRE: "Wire",
            TopAbs_EDGE: "Edge",
            TopAbs_VERTEX: "Vertex"
        }
        return type_names.get(shape_type, "Unknown")

    def _extract_subshapes(shape, output_list):
        """递归提取子形状"""
        shape_type = shape.ShapeType()

        #如果是复合体/壳体则展开，否则直接添加
        if shape_type in [TopAbs_COMPOUND, TopAbs_SHELL]:
            explorer = TopExp_Explorer(shape, TopAbs_SOLID)  # 也可扩展其他类型
            while explorer.More():
                sub_shape = explorer.Current()
                output_list.append(sub_shape)
                explorer.Next()
        else:
            output_list.append(shape)

    def parse_step_file(file_path, expand_compounds=True):
        """改进的STEP解析函数，支持展开复合体"""
        reader = STEPControl_Reader()
        reader.ReadFile(file_path)
        reader.TransferRoots()
        all_shapes = []
        for i in range(reader.NbShapes()):
            root_shape = reader.Shape(i + 1)
            if expand_compounds:
                # 递归展开复合体
                StepParser._extract_subshapes(root_shape, all_shapes)
            else:
                all_shapes.append(root_shape)

        return all_shapes

    def visualize_single_shape(shapes, index=0):
        """交互式单实体可视化"""
        # 参数校验
        if not 0 <= index < len(shapes):
            raise ValueError(f"索引 {index} 超出范围 (0-{len(shapes) - 1})")

        # 初始化显示
        display, start_display, _, _ = init_display()
        display.EraseAll()  # 清除之前的内容

        # 获取目标实体
        target_shape = shapes[index]

        # 显示基本信息
        shape_type = StepParser.analyze_shape(target_shape)
        print(f"正在显示实体 {index}:")
        print(f" - 类型: {shape_type}")
        # print(f" - 子组件数: {count_subshapes(target_shape)}")

        # 显示实体本身（红色高亮）
        display.DisplayShape(target_shape, color=Quantity_NOC_RED)

        # 显示包围盒（白色线框）
        bbox = Bnd_Box()
        brepbndlib.Add(target_shape, bbox)
        StepParser.display_bounding_box(display, bbox, color="white")

        # 自动适配视角
        display.FitAll()
        start_display()
    # 交互式查看函数
    def interactive_viewer(shapes):
        """交互式实体查看器"""
        while True:
            try:
                # 显示当前统计信息
                print(f"\n当前文件包含 {len(shapes)} 个实体")
                print("输入要查看的实体索引 (q退出): ", end="")

                # 获取用户输入
                user_input = input().strip()
                if user_input.lower() == 'q':
                    break

                index = int(user_input)
                StepParser.visualize_single_shape(shapes, index)

            except ValueError as e:
                print(f"错误输入: {e}")
            except KeyboardInterrupt:
                break



    def visualize_shapes(shapes):
        """可视化所有解析出的形状"""
        display, start_display, add_menu, add_function = init_display()

        # 颜色生成函数
        def random_color():
            return Quantity_Color(*np.random.rand(3), Quantity_TOC_RGB)

        # 递归显示复合体内容
        def display_compound(compound, color=None):
            explorer = TopExp_Explorer(compound, TopAbs_SOLID)
            while explorer.More():
                solid = explorer.Current()
                display.DisplayShape(solid, color=color or random_color())
                explorer.Next()

        for idx, shape in enumerate(shapes):
            shape_type = StepParser.analyze_shape(shape)
            print(f"Shape {idx}: {shape_type}")

            try:
                # 根据类型处理
                if shape_type == "Compound":
                    display_compound(shape)  # 显示复合体内的所有实体
                else:
                    display.DisplayShape(shape, color=random_color())
            except Exception as e:
                print(f"Error displaying shape {idx}: {str(e)}")

        display.FitAll()
        start_display()

    def display_bounding_box(display, bbox, color="white"):
        """将包围盒转换为线框显示"""
        min_corner = bbox.CornerMin()
        max_corner = bbox.CornerMax()

        # 创建包围盒8个顶点
        pnts = [
            gp_Pnt(min_corner.X(), min_corner.Y(), min_corner.Z()),
            gp_Pnt(max_corner.X(), min_corner.Y(), min_corner.Z()),
            gp_Pnt(max_corner.X(), max_corner.Y(), min_corner.Z()),
            gp_Pnt(min_corner.X(), max_corner.Y(), min_corner.Z()),
            gp_Pnt(min_corner.X(), min_corner.Y(), max_corner.Z()),
            gp_Pnt(max_corner.X(), min_corner.Y(), max_corner.Z()),
            gp_Pnt(max_corner.X(), max_corner.Y(), max_corner.Z()),
            gp_Pnt(min_corner.X(), max_corner.Y(), max_corner.Z())
        ]

        # 创建12条边
        edges = []
        indices = [(0, 1), (1, 2), (2, 3), (3, 0),
                   (4, 5), (5, 6), (6, 7), (7, 4),
                   (0, 4), (1, 5), (2, 6), (3, 7)]

        for i, j in indices:
            edge = BRepBuilderAPI_MakeEdge(pnts[i], pnts[j]).Edge()
            display.DisplayShape(edge, color=color)