#!/usr/bin/env python

# Orthanc - A Lightweight, RESTful DICOM Store
# Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
# Department, University Hospital of Liege, Belgium
# Copyright (C) 2017-2021 Osimis S.A., Belgium
#
# This program is free software: you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.


import base64
import httplib2
import json
import os
import os.path
import sys

if len(sys.argv) != 4 and len(sys.argv) != 6:
    print("""
Sample script to recursively import in Orthanc all the DICOM files
that are stored in some path. Please make sure that Orthanc is running
before starting this script. The files are uploaded through the REST
API.

Usage: %s [hostname] [HTTP port] [path]
Usage: %s [hostname] [HTTP port] [path] [username] [password]
For instance: %s 127.0.0.1 8042 .
""" % (sys.argv[0], sys.argv[0], sys.argv[0]))
    exit(-1)

URL = 'http://%s:%d/instances' % (sys.argv[1], int(sys.argv[2]))

dicom_count = 0
json_count = 0
total_file_count = 0


def IsJson(content):
    try:
        if (sys.version_info >= (3, 0)):
            json.loads(content.decode())
            return True
        else:
            json.loads(content)
            return True
    except:
        return False


# This function will upload a single file to Orthanc through the REST API
def UploadFile(path):
    global dicom_count
    global json_count
    global total_file_count

    f = open(path, 'rb')
    content = f.read()
    f.close()
    total_file_count += 1

    sys.stdout.write('Importing %s' % path)

    if IsJson(content):
        sys.stdout.write(' => ignored JSON file\n')
        json_count += 1
        return

    try:
        h = httplib2.Http()

        headers = { 'content-type' : 'application/dicom' }

        if len(sys.argv) == 6:
            username = sys.argv[4]
            password = sys.argv[5]

            # h.add_credentials(username, password)

            # This is a custom reimplementation of the
            # "Http.add_credentials()" method for Basic HTTP Access
            # Authentication (for some weird reason, this method does
            # not always work)
            # http://en.wikipedia.org/wiki/Basic_access_authentication
            creds_str = username + ':' + password
            creds_str_bytes = creds_str.encode('ascii')
            creds_str_bytes_b64 = b'Basic ' + base64.b64encode(creds_str_bytes)
            headers['authorization'] = creds_str_bytes_b64.decode('ascii')

        resp, content = h.request(URL, 'POST', 
                                  body = content,
                                  headers = headers)

        if resp.status == 200:
            sys.stdout.write(' => success\n')
            dicom_count += 1
        else:
            sys.stdout.write(' => failure (Is it a DICOM file? Is there a password?)\n')

    except:
        type, value, traceback = sys.exc_info()
        sys.stderr.write(str(value))
        sys.stdout.write(' => unable to connect (Is Orthanc running? Is there a password?)\n')


if os.path.isfile(sys.argv[3]):
    # Upload a single file
    UploadFile(sys.argv[3])
else:
    # Recursively upload a directory
    for root, dirs, files in os.walk(sys.argv[3]):
        for f in files:
            UploadFile(os.path.join(root, f))


if dicom_count + json_count == total_file_count:
    print('\nSUCCESS: %d DICOM file(s) have been successfully imported' % dicom_count)
else:
    print('\nWARNING: Only %d out of %d file(s) have been successfully imported as DICOM instance(s)' % (dicom_count, total_file_count - json_count))

if json_count != 0:
    print('NB: %d JSON file(s) have been ignored' % json_count)

print('')