#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2017 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
Moves a list of remote media from one media store to another.

The input should be a list of media files to be moved, one per line. Each line
should be formatted::

    <origin server>|<file id>

This can be extracted from postgres with::

    psql --tuples-only -A -c "select media_origin, filesystem_id from
        matrix.remote_media_cache where ..."

To use, pipe the above into::

    PYTHON_PATH=. ./scripts/move_remote_media_to_new_store.py <source repo> <dest repo>
"""

from __future__ import print_function

import argparse
import logging

import sys

import os

import shutil

from synapse.rest.media.v1.filepath import MediaFilePaths

logger = logging.getLogger()


def main(src_repo, dest_repo):
    src_paths = MediaFilePaths(src_repo)
    dest_paths = MediaFilePaths(dest_repo)
    for line in sys.stdin:
        line = line.strip()
        parts = line.split('|')
        if len(parts) != 2:
            print("Unable to parse input line %s" % line, file=sys.stderr)
            exit(1)

        move_media(parts[0], parts[1], src_paths, dest_paths)


def move_media(origin_server, file_id, src_paths, dest_paths):
    """Move the given file, and any thumbnails, to the dest repo

    Args:
        origin_server (str):
        file_id (str):
        src_paths (MediaFilePaths):
        dest_paths (MediaFilePaths):
    """
    logger.info("%s/%s", origin_server, file_id)

    # check that the original exists
    original_file = src_paths.remote_media_filepath(origin_server, file_id)
    if not os.path.exists(original_file):
        logger.warn(
            "Original for %s/%s (%s) does not exist",
            origin_server, file_id, original_file,
        )
    else:
        mkdir_and_move(
            original_file,
            dest_paths.remote_media_filepath(origin_server, file_id),
        )

    # now look for thumbnails
    original_thumb_dir = src_paths.remote_media_thumbnail_dir(
        origin_server, file_id,
    )
    if not os.path.exists(original_thumb_dir):
        return

    mkdir_and_move(
        original_thumb_dir,
        dest_paths.remote_media_thumbnail_dir(origin_server, file_id)
    )


def mkdir_and_move(original_file, dest_file):
    dirname = os.path.dirname(dest_file)
    if not os.path.exists(dirname):
        logger.debug("mkdir %s", dirname)
        os.makedirs(dirname)
    logger.debug("mv %s %s", original_file, dest_file)
    shutil.move(original_file, dest_file)


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description=__doc__,
        formatter_class = argparse.RawDescriptionHelpFormatter,
    )
    parser.add_argument(
        "-v", action='store_true', help='enable debug logging')
    parser.add_argument(
        "src_repo",
        help="Path to source content repo",
    )
    parser.add_argument(
        "dest_repo",
        help="Path to source content repo",
    )
    args = parser.parse_args()

    logging_config = {
        "level": logging.DEBUG if args.v else logging.INFO,
        "format": "%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(message)s"
    }
    logging.basicConfig(**logging_config)

    main(args.src_repo, args.dest_repo)