#!/usr/bin/python

"""

Automatic dependency generator for Node.js libraries.

Parsed from package.json.  See `man npm-json` for details.

"""

# Copyright 2012, 2013 T.C. Hollingsworth <tchollingsworth@gmail.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.

from __future__ import unicode_literals

import json

import os

import re

import subprocess

import sys

RE_VERSION = re.compile(r'\s*v?([<>=~^]{0,2})\s*([0-9][0-9\.\-]*)\s*')

def main():

    #npm2rpm uses functions here to write BuildRequires so don't print anything

    #until the very end

    deps = []

    #it's highly unlikely that we'll ever get more than one file but we handle

    #this like all RPM automatic dependency generation scripts anyway

    paths = [path.rstrip() for path in sys.stdin.readlines()]

    for path in paths:

        if not path.endswith('package.json'):

            continue

        # we only want the package.json in the toplevel module directory

        pathparts = path.split(os.sep)

        if not pathparts[-5:-2] == ['usr', 'lib', 'node_modules']:

            continue

        fh = open(path)

        metadata = json.load(fh)

        fh.close()

        #write out the node.js interpreter dependency

        req = 'rh-nodejs4-nodejs(engine)'

        if 'engines' in metadata and isinstance(metadata['engines'], dict) \

                                            and 'node' in metadata['engines']:

            deps += process_dep(req, metadata['engines']['node'])

        else:

            deps.append(req)

        if 'dependencies' in metadata:

            if isinstance(metadata['dependencies'], dict):

                for name, version in metadata['dependencies'].iteritems():

                    req = 'rh-nodejs4-npm(' + name + ')'

                    deps += process_dep(req, version)

            elif isinstance(metadata['dependencies'], list):

                for name in metadata['dependencies']:

                    req = 'rh-nodejs4-npm(' + name + ')'

                    deps.append(req)

            elif isinstance(metadata['dependencies'], basestring):

                req = 'rh-nodejs4-npm(' + metadata['dependencies'] + ')'

                deps.append(req)

            else:

                raise TypeError('invalid package.json: dependencies not a valid type')

    print '\n'.join(deps)

    # invoke the regular RPM requires generator                

    p = subprocess.Popen(['/usr/lib/rpm/find-requires'], stdout=subprocess.PIPE, stdin=subprocess.PIPE)

    print p.communicate(input='\n'.join(paths))[0]

def process_dep(req, version):

    """Converts an individual npm dependency into RPM dependencies"""

    deps = []

    #there's no way RPM can do anything like an OR dependency

    if '||' in version:

        sys.stderr.write("WARNING: The {0} dependency contains an ".format(req) +

            "OR (||) dependency: '{0}.\nPlease manually include ".format(version) +

            "a versioned dependency in your spec file if necessary")

        deps.append(req)

    elif ' - ' in version:

        gt, lt = version.split(' - ')

        deps.append(req + ' >= ' + gt)

        deps.append(req + ' <= ' + lt)

    else:

        m = re.match(RE_VERSION, version)

        if m:

            deps += convert_dep(req, m.group(1), m.group(2))

            #There could be up to two versions here (e.g.">1.0 <3.1")

            if len(version) > m.end():

                m = re.match(RE_VERSION, version[m.end():])

                if m:

                    deps += convert_dep(req, m.group(1), m.group(2))

        else:

            deps.append(req)

    return deps

def convert_dep(req, operator, version):

    """Converts one of the two possibly listed versions into an RPM dependency"""

    deps = []

    #any version will do

    if not version or version == '*':

        deps.append(req)

    #any prefix but ~ makes things dead simple

    elif operator in ['>', '<', '<=', '>=', '=']:

        deps.append(' '.join([req, operator, version]))

    #oh boy, here we go...

    else:

        #split the dotted portions into a list (handling trailing dots properly)

        parts = [part if part else 'x' for part in version.split('.')]

        parts = [int(part) if part != 'x' and not '-' in part

                                                    else part for part in parts]

        # 1 or 1.x or 1.x.x or ~1 or ^1

        if len(parts) == 1 or parts[1] == 'x':

            if parts[0] != 0:

                deps.append('{0} >= {1}'.format(req, parts[0]))

            deps.append('{0} < {1}'.format(req, parts[0]+1))

        # 1.2.3 or 1.2.3-4 or 1.2.x or ~1.2.3 or ^1.2.3 or 1.2

        elif len(parts) == 3 or operator != '~':

            # 1.2.x or 1.2

            if len(parts) == 2 or parts[2] == 'x':

                deps.append('{0} >= {1}.{2}'.format(req, parts[0], parts[1]))

                deps.append('{0} < {1}.{2}'.format(req, parts[0], parts[1]+1))

            # ~1.2.3 or ^0.1.2 (zero is special with the caret operator)

            elif operator == '~' or (operator == '^' and parts[0] == 0 and parts[1] > 0):

                deps.append('{0} >= {1}'.format(req, version))

                deps.append('{0} < {1}.{2}'.format(req, parts[0], parts[1]+1))

            #^1.2.3

            elif operator == '^' and parts[0:1] != [0,0]:

                deps.append('{0} >= {1}'.format(req, version))

                deps.append('{0} < {1}'.format(req, parts[0]+1))

            # 1.2.3 or 1.2.3-4 or ^0.0.3

            else:

                deps.append('{0} = {1}'.format(req, version))

        # ~1.2

        elif operator == '~':

            deps.append('{0} >= {1}'.format(req, version))

            deps.append('{0} < {1}'.format(req, parts[0]+1))

        #^1.2

        elif operator == '^':

            deps.append('{0} >= {1}'.format(req, version))

            deps.append('{0} < {1}'.format(req, parts[0]+1))

    return deps

if __name__ == '__main__':

    main()