app.py

#!/usr/bin/env python
# coding: utf-8


import os
import shutil
import tempfile
import zipfile

import requests
import streamlit as st
import xml.etree.ElementTree as ET


def elevation_change(bcf_list, z_error_correction_in_metres: float):

    update_data_list = []

    for individual_file in file_list:
        
        if 'viewpoint' in individual_file:
            
            bcf_guid = individual_file.split('/', 1)[0]
            parsed_markup_file = file_open.open(bcf_guid + '/markup.bcf')
            xml_tree_markup = ET.parse(parsed_markup_file)
            xml_root_markup = xml_tree_markup.getroot()

            for topic_data in xml_root_markup.iter('Topic'):
                
                component_guids = []
                component_batids = []
                parsed_viewpoint_file = file_open.open(individual_file)
                xml_tree_viewpoint = ET.parse(parsed_viewpoint_file)
                xml_root_viewpoint = xml_tree_viewpoint.getroot()
                    
                updateZValue(xml_root_viewpoint, 'CameraViewPoint', z_error_correction_in_metres)

                for bitmap_data in xml_root_viewpoint.iter('Bitmap'):
            
                    updateZValue(bitmap_data, 'Location', z_error_correction_in_metres)
                        
                for clipping_plane_data in xml_root_viewpoint.iter('ClippingPlane'):
            
                    updateZValue(clipping_plane_data, 'Location', z_error_correction_in_metres)

                for line_data in xml_root_viewpoint.iter('Line'):
            
                    updateZValue(line_data, 'StartPoint', z_error_correction_in_metres)
                    updateZValue(line_data, 'EndPoint', z_error_correction_in_metres)

            individual_xml_update = {
                            'individual_file':individual_file,
                            'xml_string_update': ET.tostring(xml_root_viewpoint)
                    }
            
            update_data_list.append(individual_xml_update)

    return update_data_list


def updateZip(zipname, filename, data):
    # generate a temp file
    tmpfd, tmpname = tempfile.mkstemp(dir=os.path.dirname(zipname))
    os.close(tmpfd)

    # create a temp copy of the archive without filename            
    with zipfile.ZipFile(zipname, 'r') as zin:
        with zipfile.ZipFile(tmpname, 'w') as zout:
            zout.comment = zin.comment # preserve the comment
            for item in zin.infolist():
                if item.filename != filename:
                    zout.writestr(item, zin.read(item.filename))

    # replace with the temp archive
    os.remove(zipname)
    os.rename(tmpname, zipname)

    # now add filename with its new data
    with zipfile.ZipFile(zipname, mode='a', compression=zipfile.ZIP_DEFLATED) as zf:
        zf.writestr(filename, data)


def updateZipForMultipleFiles(file_names_and_data, zipname='temp.zip'):
    # generate a temp file
    
    # test_dataset.save_to_disk("test.hf")
    tmpfd, tmpname = tempfile.mkstemp(dir=os.path.dirname(zipname))
    os.close(tmpfd)

    # create a temp copy of the archive without filename            
    with zipfile.ZipFile(zipname, 'r') as zin:
        with zipfile.ZipFile(tmpname, 'w') as zout:
            zout.comment = zin.comment # preserve the comment
            for item in zin.infolist():
                if not 'viewpoint' in item.filename:
                    zout.writestr(item, zin.read(item.filename))

    # replace with the temp archive
    os.remove(zipname)
    os.rename(tmpname, zipname)

    # now add filename with its new data
    for individual_update in file_names_and_data:
        with zipfile.ZipFile(zipname, mode='a', compression=zipfile.ZIP_DEFLATED) as zf:
            zf.writestr(individual_update['individual_file'], individual_update['xml_string_update'])

    return True
            

def updateZValue(xml_data, xml_element_to_iterate, z_error_correction_in_metres):
    
    for location_data in xml_data.iter(xml_element_to_iterate):

        existing_z = float(location_data.find('Z').text)
        new_z = existing_z + z_error_correction_in_metres
        location_data.find('Z').text = str(new_z)


st.markdown(
    '''
        # Adjust the height of all issues in a BCF file

        Provide any bcf file. 

        Select the height adjustment in metres.

    '''
)


bcf_file_button = st.text_input(
    "Dropbox link to BCF file",
    key="bcf_file_button"
)

# In[ ]:

if bcf_file_button:

    bcf_file_path = st.session_state.bcf_file_button
    path_original = 'original.zip'
    path_updated = 'temp.zip'

    if '=0' in bcf_file_path:

        bcf_file_path = bcf_file_path.replace('=0', '=1')

    if '.bcf' in bcf_file_path:

        updated = False
        partial_filename = bcf_file_path.rsplit('/')[-1]
        filename = partial_filename.split('.bcf')[0]
        bcf_file_path = bcf_file_path.replace('.bcf', '.zip')

        r = requests.get(bcf_file_path, stream=True)
        if r.status_code == 200:
            with open(path_original, 'wb') as f:
                for chunk in r:
                    f.write(chunk)
        shutil.copy2(path_original, path_updated)
        file_open = zipfile.ZipFile(path_original)
        file_list = file_open.namelist()

        height_change_button = st.number_input(
            "Height of the sheet to be returned",
            format="%.3f",
            value=0.000,
            min_value=-1000.0,
            max_value=1000.0,
            step=0.001,
            key="height_change_button"
        )

        if height_change_button:

            height_change = st.session_state.height_change_button

            update_bcf_info = elevation_change(
                file_list,
                height_change,
            )

            updated = updateZipForMultipleFiles(
                update_bcf_info,
            )

            if updated:

                with open(path_updated, "rb") as fp:
                    btn = st.download_button(
                    label="Download BCF file",
                    data=fp,
                    file_name=f"{filename}_height_{height_change}.bcf",
                    mime="application/zip"
                )

    else:

        st.write('Please provide a valid BCF file')