import os, sys, time, bpy, bmesh, shutil
import platform
if platform.system() == 'Windows':
    sys.path.append('e:\\libs\\')
else:
    sys.path.append('/data/deploy/make3d/make2/libs/')
    
import config, libs, libs_db

def bmesh_copy_from_object(obj, transform=True, triangulate=True, apply_modifiers=False):
    """Returns a transformed, triangulated copy of the mesh"""
    assert obj.type == 'MESH'
    if apply_modifiers and obj.modifiers:
        import bpy
        depsgraph = bpy.context.evaluated_depsgraph_get()
        obj_eval = obj.evaluated_get(depsgraph)
        me = obj_eval.to_mesh()
        bm = bmesh.new()
        bm.from_mesh(me)
        obj_eval.to_mesh_clear()
    else:
        me = obj.data
        if obj.mode == 'EDIT':
            bm_orig = bmesh.from_edit_mesh(me)
            bm = bm_orig.copy()
        else:
            bm = bmesh.new()
            bm.from_mesh(me)
    if transform:
        matrix = obj.matrix_world.copy()
        if not matrix.is_identity:
            bm.transform(matrix)
            matrix.translation.zero()
            if not matrix.is_identity:
                bm.normal_update()
    if triangulate:
        bmesh.ops.triangulate(bm, faces=bm.faces)
    return bm

def reload_obj(pid, action):
    obj_filename = os.path.join(config.workdir, action, pid, f'{pid}.obj')
    bpy.ops.wm.read_homefile()
    bpy.ops.object.delete(use_global=False, confirm=False)
    bpy.ops.import_scene.obj(filepath=obj_filename)
    bpy.context.scene.unit_settings.scale_length = 0.001
    bpy.context.scene.unit_settings.length_unit = 'CENTIMETERS'
    bpy.context.scene.unit_settings.mass_unit = 'GRAMS'

    obj = bpy.context.selected_objects[0]
    bpy.context.view_layer.objects.active = obj
    obj.select_set(True)

    return obj

def cal_weight(obj, size):
        # 统一缩放到9cm标准尺寸
    scale = size / obj.dimensions.z
    obj.scale = (scale, scale, scale)
    bpy.ops.object.transform_apply(scale=True)

    # bpy.ops.wm.save_as_mainfile(filepath=os.path.join(config.workdir, action, pid, f'{pid}-{size/10}cm.blend'))
    model_info = {}
    bm = bmesh_copy_from_object(obj)
    model_info['volume'] = round(bm.calc_volume() / 1000)
    model_info['weight'] = round(model_info['volume'] * 1.226)
    print(f'{size/10}cm：体积 {model_info["volume"]}cm³, 克重 {model_info["weight"]}g')

def main(action, pid, sizes):
    libs.down_obj_from_oss(config.workdir, pid, action)
    obj = reload_obj(pid, action)
    
    bpy.ops.object.transform_apply(location=True, rotation=True, scale=True)
    print(f'模型{pid}的体积与克重估算信息:')
    for size in sizes:
        size = float(size)
        cal_weight(obj, size)
    
if __name__ == '__main__':
    sizes = (90, 120, 150, 180)

    if len(sys.argv) == 3:
        action = sys.argv[1]
        pids = sys.argv[2].split(',')
        for pid in pids:
            main(action, pid, sizes)
    elif len(sys.argv) == 4:
        action = sys.argv[1]
        pids = sys.argv[2].split(',')
        sizes = sys.argv[3].split(',')
        for pid in pids:
            main(action, pid, sizes)
        print('Usage: python cal_weight.py print <pids> 自定义尺寸/默认四个尺寸就不填')