# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

from __future__ import print_function
import os

import llnl.util.tty as tty
import llnl.util.tty.color as color

import spack.repo


description = "list downloadable resources (tarballs, repos, patches, etc.)"
section = "basic"
level = "long"


def setup_parser(subparser):
    sp = subparser.add_subparsers(
        metavar='SUBCOMMAND', dest='resource_command')

    list_parser = sp.add_parser('list', help=resource_list.__doc__)
    list_parser.add_argument('--only-hashes', action='store_true',
                             help='only print sha256 hashes of resources')

    show_parser = sp.add_parser('show', help=resource_show.__doc__)
    show_parser.add_argument('hash', action='store')


def _show_patch(sha256):
    """Show a record from the patch index."""
    patches = spack.repo.path.patch_index.index
    data = patches.get(sha256)

    if not data:
        candidates = [k for k in patches if k.startswith(sha256)]
        if not candidates:
            tty.die('no such resource: %s' % sha256)
        elif len(candidates) > 1:
            tty.die('%s: ambiguous hash prefix. Options are:',
                    *candidates)

        sha256 = candidates[0]
        data = patches.get(sha256)

    color.cprint('@c{%s}' % sha256)
    for package, rec in data.items():
        owner = rec['owner']

        if 'relative_path' in rec:
            pkg_dir = spack.repo.get(owner).package_dir
            path = os.path.join(pkg_dir, rec['relative_path'])
            print("    path:       %s" % path)
        else:
            print("    url:        %s" % rec['url'])

        print("    applies to: %s" % package)
        if owner != package:
            print("    patched by: %s" % owner)


def resource_list(args):
    """list all resources known to spack (currently just patches)"""
    patches = spack.repo.path.patch_index.index
    for sha256 in patches:
        if args.only_hashes:
            print(sha256)
        else:
            _show_patch(sha256)


def resource_show(args):
    """show a resource, identified by its checksum"""
    _show_patch(args.hash)


def resource(parser, args):
    action = {
        'list': resource_list,
        'show': resource_show
    }
    action[args.resource_command](args)
