"""Dump paths to library dataset files (e.g. for backups). Caveats:

    - Does not perform any permissions checks on library *contents* (but you can restrict to "public" libraries).
    - Only the latest version of undeleted library datasets are dumped.

To use with rsync:
$ python dump_library_paths.py [options] -o libfiles.txt --relative /srv/galaxy/datasets
$ rsync -arvPR --files-from=libfiles.txt /srv/galaxy/datasets backup@backuphost:/backup/galaxy/datasets

Or all in one:
$ python dump_library_paths.py [options] --relative /srv/galaxy/datasets | rsync -arvPR \
    --files-from=- /srv/galaxy/datasets backuphost:/backup/galaxy/datasets
"""

import logging
import os
import sys

from sqlalchemy import (
    false,
    not_,
)

sys.path.insert(1, os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir, "lib")))

import galaxy.config
import galaxy.model.mapping
from galaxy.objectstore import build_object_store_from_config
from galaxy.util.script import main_factory

DESCRIPTION = "Locate all datasets in libraries."
ARGUMENTS = (
    (
        ("-v", "--verbose"),
        dict(
            action="store_true",
            default=False,
            help="Verbose logging output",
        ),
    ),
    (
        ("-o", "--output"),
        dict(
            default="stdout",
            help="Write output to file",
        ),
    ),
    (
        ("-p", "--public"),
        dict(action="store_true", default=False, help='Only dump files in "public" libraries'),
    ),
    (
        ("--relative",),
        dict(
            default=None,
            help="Write paths relative to the given directory",
        ),
    ),
    (
        ("--exists",),
        dict(
            action="store_true",
            default=False,
            help="Check for dataset existence, warn if it does not exist",
        ),
    ),
)

logging.basicConfig(stream=sys.stderr)
log = logging.getLogger(__name__)


def _config_logging(args):
    if args.verbose:
        log.setLevel(logging.DEBUG)


def _get_libraries(args, model):
    log.debug("Setting up query")
    library_access_action = model.security_agent.permitted_actions.LIBRARY_ACCESS.action
    query = model.context.query(model.Library)
    query = query.filter(model.Library.table.c.deleted == false())
    if args.public:
        restricted_library_ids = {
            lp.library_id
            for lp in (
                model.context.query(model.LibraryPermissions)
                .filter(model.LibraryPermissions.table.c.action == library_access_action)
                .distinct()
            )
        }
        if restricted_library_ids:
            query = query.filter(not_(model.Library.table.c.id.in_(restricted_library_ids)))
    query = query.order_by(model.Library.table.c.name)
    return query


def _walk_library(folder):
    datasets = set()
    for f in folder.folders:
        datasets.update(_walk_library(f))
    for ld in folder.active_datasets:
        datasets.add(ld.library_dataset_dataset_association.dataset)
    return datasets


def _walk_libraries(args, model):
    for library in _get_libraries(args, model):
        for dataset in _walk_library(library.root_folder):
            yield (library, dataset)


def _open_output(args):
    if args.output == "stdout":
        return sys.stdout
    else:
        return open(args.output, "w")


def _path(path, args):
    if args.relative is not None:
        return os.path.relpath(path, args.relative)
    else:
        return path


def _get_library_dataset_paths(args, kwargs):
    _config_logging(args)
    config = galaxy.config.Configuration(**kwargs)
    object_store = build_object_store_from_config(config)
    model = galaxy.model.mapping.init("/tmp/", kwargs.get("database_connection"), object_store=object_store)
    output = _open_output(args)
    last_library = None
    log.debug("Beginning library walk")
    for library, dataset in _walk_libraries(args, model):
        if library != last_library:
            log.info("Library: %s", library.name)
        filename = object_store.get_filename(dataset)
        files_dir = dataset.get_extra_files_path()
        if (args.exists and object_store.exists(dataset)) or not args.exists:
            output.write(f"{_path(filename, args)}\n")
        elif args.exists:
            log.warning("Missing %s", filename)
        if files_dir and os.path.exists(files_dir):
            output.write(f"{_path(files_dir, args)}\n")
        last_library = library
    output.close()


ACTIONS = {
    "get_library_dataset_paths": _get_library_dataset_paths,
}


if __name__ == "__main__":
    main = main_factory(
        description=DESCRIPTION, actions=ACTIONS, arguments=ARGUMENTS, default_action="get_library_dataset_paths"
    )
    main()