#!/usr/bin/env fuchsia-vendored-python
# Copyright 2017 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import argparse
import json
import os
import sys

try:
    # Python 3
    from urllib.parse import urlparse
except ImportError:
    from urlparse import urlparse

from sdk_common import Atom


class MappingAction(argparse.Action):
    """Parses file mappings flags."""

    def __init__(self, option_strings, dest, nargs=None, **kwargs):
        if nargs is not None:
            raise ValueError("nargs is not allowed")
        super(MappingAction, self).__init__(
            option_strings, dest, nargs=2, **kwargs
        )

    def __call__(self, parser, namespace, values, option_string=None):
        mappings = getattr(namespace, "mappings", None)
        if mappings is None:
            mappings = {}
            setattr(namespace, "mappings", mappings)
        mappings[values[0]] = values[1]


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--manifest", help="Path to the SDK's manifest file", required=True
    )
    parser.add_argument(
        "--mapping",
        help="Extra files to add to the archive",
        action=MappingAction,
    )
    parser.add_argument(
        "--output", help="Path to the output file manifest", required=True
    )
    args = parser.parse_args()

    with open(args.manifest, "r") as manifest_file:
        manifest = json.load(manifest_file)

    all_files = {}

    def add(dest_path, src_path):
        dest = os.path.normpath(dest_path)
        src = os.path.normpath(src_path)
        if dest in all_files:
            # `sdk://packages/blobs/` and `sdk://packages/subpackage_manifests/`
            # directories may contain duplicate files, named as the hash of their
            # content. File content will match, and no concern on collision.
            _ignored_prefixes = (
                "packages/blobs/",
                "packages/subpackage_manifests/",
            )
            if dest.startswith(_ignored_prefixes):
                pass
            else:
                print("Error: multiple entries for %s" % dest)
                print("  - %s" % all_files[dest])
                print("  - %s" % src)
                return 1
        all_files[dest] = src

    for atom in [Atom(a) for a in manifest["atoms"]]:
        for file in atom.files:
            add(file.destination, file.source)

    for dest, source in args.mappings.items():
        add(dest, source)

    with open(args.output, "w") as output_file:
        for dest, src in sorted(all_files.items()):
            dest = os.path.relpath(dest)
            src = os.path.relpath(src)
            output_file.write("%s=%s\n" % (dest, src))


if __name__ == "__main__":
    sys.exit(main())