import bpy
import json
import mathutils
import os
import bmesh
import sys

# 获取命令行参数
def get_json_path():
    """从命令行参数获取JSON文件路径"""
    if len(sys.argv) > 5:  # Blender传递的参数格式: blender --background --python script.py -- json_path
        # 查找 -- 分隔符后的参数
        for i, arg in enumerate(sys.argv):
            if arg == "--" and i + 1 < len(sys.argv):
                return sys.argv[i + 1]
    
    # 如果没有找到参数，使用默认路径
    return "./e8caffb4622e03b1495bbc1ed13fce13.json"

# 清空场景
bpy.ops.wm.read_factory_settings(use_empty=True)

# 设置渲染引擎为Cycles（更好的材质渲染）
bpy.context.scene.render.engine = 'CYCLES'

# 加载 JSON 文件
json_path = get_json_path()
print(f"尝试加载JSON文件：{json_path}")

try:
    with open(json_path, 'r', encoding='utf-8') as f:
        data = json.load(f)
    print(f"✅ 成功加载JSON文件：{json_path}")
    print(f"包含 {len(data['children'])} 个对象")
except FileNotFoundError:
    print(f"❌ 错误：找不到JSON文件 {json_path}")
    sys.exit(1)
except json.JSONDecodeError as e:
    print(f"❌ 错误：JSON文件格式错误 {e}")
    sys.exit(1)
except Exception as e:
    print(f"❌ 错误：加载JSON文件时出错 {e}")
    sys.exit(1)

# 创建金属材质
def create_metal_material():
    mat = bpy.data.materials.new(name="metal")
    mat.use_nodes = True
    bsdf = mat.node_tree.nodes["Principled BSDF"]
    bsdf.inputs["Metallic"].default_value = 1.0
    bsdf.inputs["Roughness"].default_value = 0.2
    bsdf.inputs["Base Color"].default_value = (0.8, 0.8, 0.9, 1.0)  # 淡蓝色金属
    return mat

# 创建透明材质（用于 nothing）
def create_nothing_material():
    mat = bpy.data.materials.new(name="nothing")
    mat.use_nodes = True
    bsdf = mat.node_tree.nodes["Principled BSDF"]
    bsdf.inputs["Alpha"].default_value = 0.1
    bsdf.inputs["Base Color"].default_value = (1.0, 1.0, 1.0, 0.1)
    mat.blend_method = 'BLEND'
    mat.show_transparent_back = False
    return mat

# 创建发光材质（用于特殊对象）
def create_emissive_material():
    mat = bpy.data.materials.new(name="emissive")
    mat.use_nodes = True
    bsdf = mat.node_tree.nodes["Principled BSDF"]
    
    # 在Blender 4.0+中，发光属性可能位置不同
    try:
        if "Emission" in bsdf.inputs:
            bsdf.inputs["Emission"].default_value = (1.0, 0.8, 0.2, 1.0)
        elif "Emission Color" in bsdf.inputs:
            bsdf.inputs["Emission Color"].default_value = (1.0, 0.8, 0.2, 1.0)
        
        if "Emission Strength" in bsdf.inputs:
            bsdf.inputs["Emission Strength"].default_value = 2.0
        else:
            # 备用方案：使用较亮的基础颜色
            bsdf.inputs["Base Color"].default_value = (1.0, 0.8, 0.2, 1.0)
    except Exception as e:
        print(f"设置发光材质时出错: {e}")
        # 备用方案：创建简单的明亮材质
        bsdf.inputs["Base Color"].default_value = (1.0, 0.8, 0.2, 1.0)
        bsdf.inputs["Roughness"].default_value = 0.1
    
    return mat

# 创建材质
metal_mat = create_metal_material()
nothing_mat = create_nothing_material()
emissive_mat = create_emissive_material()

# 创建更精确的抛物面
def create_parabolic_surface(face_f, size=2.0, resolution=32):
    bm = bmesh.new()
    
    # 创建抛物面网格
    for i in range(resolution):
        for j in range(resolution):
            u = (i / (resolution - 1) - 0.5) * size
            v = (j / (resolution - 1) - 0.5) * size
            
            # 抛物面方程: z = (u^2 + v^2) / (4*f)
            if face_f > 0 and face_f < 1e9:  # 避免除零和无限大
                z = (u*u + v*v) / (4 * face_f)
            else:
                z = 0
            
            bm.verts.new((u, v, z))
    
    bm.verts.ensure_lookup_table()
    
    # 创建面
    for i in range(resolution - 1):
        for j in range(resolution - 1):
            v1 = i * resolution + j
            v2 = i * resolution + j + 1
            v3 = (i + 1) * resolution + j + 1
            v4 = (i + 1) * resolution + j
            
            bm.faces.new([bm.verts[v1], bm.verts[v2], bm.verts[v3], bm.verts[v4]])
    
    # 创建网格对象
    mesh = bpy.data.meshes.new("parabolic_surface")
    bm.to_mesh(mesh)
    bm.free()
    
    obj = bpy.data.objects.new("parabolic_surface", mesh)
    bpy.context.collection.objects.link(obj)
    
    return obj

# 创建双曲面
def create_hyperbolic_surface(face_f, face_g, size=2.0, resolution=32):
    bm = bmesh.new()
    
    # 创建双曲面网格
    for i in range(resolution):
        for j in range(resolution):
            u = (i / (resolution - 1) - 0.5) * size
            v = (j / (resolution - 1) - 0.5) * size
            
            # 双曲面方程: z^2/f^2 - (u^2 + v^2)/g^2 = 1
            if abs(face_g) > 0.1 and abs(face_f) > 0.1:
                try:
                    z_squared = face_f * face_f * (1 + (u*u + v*v) / (face_g * face_g))
                    if z_squared >= 0:
                        z = (face_f if face_f > 0 else -face_f) * (z_squared ** 0.5)
                    else:
                        z = 0
                except:
                    z = 0
            else:
                z = 0
            
            bm.verts.new((u, v, z))
    
    bm.verts.ensure_lookup_table()
    
    # 创建面
    for i in range(resolution - 1):
        for j in range(resolution - 1):
            v1 = i * resolution + j
            v2 = i * resolution + j + 1
            v3 = (i + 1) * resolution + j + 1
            v4 = (i + 1) * resolution + j
            
            bm.faces.new([bm.verts[v1], bm.verts[v2], bm.verts[v3], bm.verts[v4]])
    
    mesh = bpy.data.meshes.new("hyperbolic_surface")
    bm.to_mesh(mesh)
    bm.free()
    
    obj = bpy.data.objects.new("hyperbolic_surface", mesh)
    bpy.context.collection.objects.link(obj)
    
    return obj

# 根据面类型创建物体
def create_geometry(obj_data):
    face_geom = obj_data.get("face_geometry", "plane")
    face_type = obj_data.get("face_type", "")
    name = obj_data.get("name", "noname")
    pos = obj_data["p"]
    quat = obj_data["q"]
    material_name = obj_data.get("draw_material", "metal")
    face_f = obj_data.get("face_f", 1.0)
    face_g = obj_data.get("face_g", 1.0)

    print(f"创建对象: {name} ({face_geom})")
    
    mesh = None
    
    try:
        if face_geom == "plane":
            bpy.ops.mesh.primitive_plane_add(size=2)
            mesh = bpy.context.active_object
        elif face_geom == "parabola":
            if face_f < 1e9 and face_f > 0.1:  # 使用精确抛物面
                mesh = create_parabolic_surface(face_f)
            else:  # 使用简化圆锥
                bpy.ops.mesh.primitive_cone_add(vertices=32, radius1=1.5, radius2=0.1, depth=2.0)
                mesh = bpy.context.active_object
        elif face_geom == "hyperbola":
            if abs(face_f) > 0.1 and abs(face_g) > 0.1:  # 使用精确双曲面
                mesh = create_hyperbolic_surface(face_f, face_g)
            else:  # 使用简化环面
                bpy.ops.mesh.primitive_torus_add(major_radius=1.0, minor_radius=0.3)
                mesh = bpy.context.active_object
        else:
            # 默认立方体
            bpy.ops.mesh.primitive_cube_add(size=1.0)
            mesh = bpy.context.active_object
    except Exception as e:
        print(f"创建几何体时出错: {e}")
        # 备用：创建简单立方体
        bpy.ops.mesh.primitive_cube_add(size=0.5)
        mesh = bpy.context.active_object

    # 设置对象属性
    mesh.name = name
    mesh.location = pos
    mesh.rotation_mode = 'QUATERNION'
    mesh.rotation_quaternion = mathutils.Quaternion(quat)

    # 设置材质
    if material_name == "metal":
        mesh.data.materials.append(metal_mat)
    elif material_name == "nothing":
        mesh.data.materials.append(nothing_mat)
    else:
        mesh.data.materials.append(emissive_mat)

    return mesh

# 创建集合来组织对象
collection = bpy.data.collections.new("OpticalSystem")
bpy.context.scene.collection.children.link(collection)

# 遍历并创建所有子对象
created_objects = []
for i, child in enumerate(data["children"]):
    try:
        obj = create_geometry(child)
        created_objects.append(obj)
        
        # 将对象移动到专用集合
        bpy.context.collection.objects.unlink(obj)
        collection.objects.link(obj)
        
    except Exception as e:
        print(f"创建对象 {i} 时出错: {e}")

print(f"成功创建了 {len(created_objects)} 个对象")

# 添加相机和灯光
def setup_scene():
    # 添加相机
    bpy.ops.object.camera_add(location=(15, -15, 10))
    camera = bpy.context.active_object
    camera.rotation_euler = (1.1, 0, 0.785)
    bpy.context.scene.camera = camera
    
    # 添加主灯光
    bpy.ops.object.light_add(type='SUN', location=(5, 5, 10))
    sun = bpy.context.active_object
    sun.data.energy = 3.0
    
    # 添加环境光
    bpy.ops.object.light_add(type='AREA', location=(-5, -5, 8))
    area = bpy.context.active_object
    area.data.energy = 50.0
    area.data.size = 10.0

setup_scene()

# 设置渲染参数
scene = bpy.context.scene
scene.render.resolution_x = 1920
scene.render.resolution_y = 1080
scene.render.image_settings.file_format = 'PNG'

# 导出函数
def export_model():
    print(f"准备导出 {len(created_objects)} 个对象...")
    
    if not created_objects:
        print("警告：没有创建任何对象，跳过导出")
        return
    
    # 选择所有创建的对象
    bpy.ops.object.select_all(action='DESELECT')
    for obj in created_objects:
        if obj and obj.name in bpy.data.objects:
            obj.select_set(True)
            print(f"已选择对象: {obj.name}")
    
    try:
        # 导出为OBJ格式
        obj_path = os.path.abspath("./optical_system.obj")
        bpy.ops.export_scene.obj(filepath=obj_path, use_selection=True, use_materials=True)
        print(f"模型已导出为: {obj_path}")
    except Exception as e:
        print(f"OBJ导出失败: {e}")
    
    try:
        # 导出为GLB格式（适合web展示）
        glb_path = os.path.abspath("./optical_system.glb")
        bpy.ops.export_scene.gltf(filepath=glb_path, use_selection=True, export_materials='EXPORT')
        print(f"模型已导出为: {glb_path}")
    except Exception as e:
        print(f"GLB导出失败: {e}")
    
    try:
        # 保存Blender文件
        blend_path = os.path.abspath("./optical_system.blend")
        bpy.ops.wm.save_as_mainfile(filepath=blend_path)
        print(f"Blender文件已保存为: {blend_path}")
    except Exception as e:
        print(f"Blender文件保存失败: {e}")

# 渲染图像
def render_image():
    try:
        render_path = os.path.abspath("./optical_system_render.png")
        scene.render.filepath = render_path
        print(f"开始渲染到: {render_path}")
        bpy.ops.render.render(write_still=True)
        print(f"渲染图像已保存为: {render_path}")
    except Exception as e:
        print(f"渲染失败: {e}")
        import traceback
        traceback.print_exc()

# 执行导出和渲染
try:
    print("开始导出模型...")
    export_model()
    print("开始渲染图像...")
    render_image()
    print("脚本执行完成！")
    print("生成的文件:")
    print("- optical_system.obj (3D模型)")
    print("- optical_system.glb (Web友好格式)")
    print("- optical_system.blend (Blender工程文件)")
    print("- optical_system_render.png (渲染图像)")
except Exception as e:
    print(f"执行导出/渲染时出错: {e}")
    import traceback
    traceback.print_exc()