#!/usr/bin/python

# -*- coding: utf-8 -*-

# Copyright 2012 T.C. Hollingsworth <tchollingsworth@gmail.com>

# Copyright 2017 Tomas Tomecek <ttomecek@redhat.com>

# Copyright 2019 Jan Staněk <jstanek@redhat.com>

#

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to

# deal in the Software without restriction, including without limitation the

# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

# sell copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

#

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

#

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

# IN THE SOFTWARE.

"""Automatic provides generator for Node.js libraries.

Metadata taken from package.json.  See `man npm-json` for details.

"""

from __future__ import print_function, with_statement

import json

import os

import sys

from itertools import chain, groupby

DEPENDENCY_TEMPLATE = "rh-nodejs10-npm(%(name)s) = %(version)s"

BUNDLED_TEMPLATE = "bundled(nodejs-%(name)s) = %(version)s"

NODE_MODULES = {"node_modules", "node_modules.bundled"}

class PrivatePackage(RuntimeError):

    """Private package metadata that should not be listed."""

#: Something is wrong with the ``package.json`` file

_INVALID_METADATA_FILE = (IOError, PrivatePackage, KeyError)

def format_metadata(metadata, bundled=False):

    """Format ``package.json``-like metadata into RPM dependency.

    Arguments:

        metadata (dict): Package metadata, presumably read from ``package.json``.

        bundled (bool): Should the bundled dependency format be used?

    Returns:

        str: RPM dependency (i.e. ``npm(example) = 1.0.0``)

    Raises:

        KeyError: Expected key (i.e. ``name``, ``version``) missing in metadata.

        PrivatePackage: The metadata indicate private (unlisted) package.

    """

    # Skip private packages

    if metadata.get("private", False):

        raise PrivatePackage(metadata)

    template = BUNDLED_TEMPLATE if bundled else DEPENDENCY_TEMPLATE

    return template % metadata

def generate_dependencies(module_path, module_dir_set=NODE_MODULES):

    """Generate RPM dependency for a module and all it's dependencies.

    Arguments:

        module_path (str): Path to a module directory or it's ``package.json``

        module_dir_set (set): Base names of directories to look into

            for bundled dependencies.

    Yields:

        str: RPM dependency for the module and each of it's (public) bundled dependencies.

    Raises:

        ValueError: module_path is not valid module or ``package.json`` file

    """

    # Determine paths to root module directory and package.json

    if os.path.isdir(module_path):

        root_dir = module_path

    elif os.path.basename(module_path) == "package.json":

        root_dir = os.path.dirname(module_path)

    else:  # Invalid metadata path

        raise ValueError("Invalid module path '%s'" % module_path)

    for dir_path, subdir_list, __ in os.walk(root_dir):

        # Currently in node_modules (or similar), continue to subdirs

        if os.path.basename(dir_path) in module_dir_set:

            continue

        # Read and format metadata

        metadata_path = os.path.join(dir_path, "package.json")

        bundled = dir_path != root_dir

        try:

            with open(metadata_path, mode="r") as metadata_file:

                metadata = json.load(metadata_file)

            yield format_metadata(metadata, bundled=bundled)

        except _INVALID_METADATA_FILE:

            pass  # Ignore

        # Only visit subdirectories in module_dir_set

        subdir_list[:] = list(module_dir_set & set(subdir_list))

if __name__ == "__main__":

    module_paths = (path.strip() for path in sys.stdin)

    provides = chain.from_iterable(generate_dependencies(m) for m in module_paths)

    # sort|uniq

    for provide, __ in groupby(sorted(provides)):

        print(provide)