#!/usr/bin/python

"""Symlink a node module's dependencies into the node_modules directory so users
can `npm link` RPM-installed modules into their personal projects."""

# 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.

import json
import os
import sys

def symlink(source, dest):
    try:
        os.symlink(source, dest)
    except OSError:
        if os.path.islink(dest) and os.path.realpath(dest) == os.path.normpath(source):
            sys.stderr.write("""
WARNING: the symlink for dependency "{0}" already exists

This could mean that the dependency exists in both devDependencies and 
dependencies, which may cause trouble for people using this module with npm.

Please report this to upstream. For more information, see:
    <https://github.com/tchollingsworth/nodejs-packaging/pull/1>
""".format(dest))
            
        else:
            sys.stderr.write("""
ERROR: the path for dependency "{0}" already exists

This could mean that bundled modules are being installed.  Bundled libraries are
forbidden in Fedora. For more information, see:
    <https://fedoraproject.org/wiki/Packaging:No_Bundled_Libraries>
    
It is generally reccomended to remove the entire "node_modules" directory in
%prep when it exists. For more information, see:
    <https://fedoraproject.org/wiki/Packaging:Node.js#Removing_bundled_modules>
    
If you have obtained permission from the Fedora Packaging Committee to bundle
libraries, please use `%nodejs_fixdep -r` in %prep to remove the dependency on
the bundled module. This will prevent an unnecessary dependency on the system
version of the module and eliminate this error.
""".format(dest))
            sys.exit(1)
        

def symlink_deps(deps, check):
    if isinstance(deps, dict):
        for dep, ver in deps.iteritems():
            if dep in mvpkgs and ver != '' and ver != '*':
                depver = ver.lstrip('~').split('.')[0]
                target = os.path.join(sitelib, '{0}@{1}'.format(dep, depver))
            else:
                target = os.path.join(sitelib, dep)
                
            if not check or os.path.exists(target):
                symlink(target, dep)
                
    elif isinstance(deps, list):
        for dep in deps:
            target = os.path.join(sitelib, dep)
            if not check or os.path.exists(target):
                symlink(target, dep)
    
    elif isinstance(deps, basestring):
        target = os.path.join(sitelib, deps)
        if not check or os.path.exists(target):
            symlink(target, deps)
            
    else:
        raise TypeError("Invalid package.json: dependencies weren't a recognized type")


#the %nodejs_symlink_deps macro passes %nodejs_sitelib as the first argument
sitelib = sys.argv[1]

#read in the list of mutiple-versioned packages
mvpkgs = open('/opt/rh/nodejs010/root/usr/share/node/multiver_modules').read().split('\n')

if '--check' in sys.argv:
    check = True
    modules = [os.getcwd()]
else:
    check = False
    br_sitelib = os.path.join(os.environ['RPM_BUILD_ROOT'], sitelib.lstrip('/'))
    modules = [os.path.join(br_sitelib, module) for module in os.listdir(br_sitelib)]

for path in modules:
    os.chdir(path)
    md = json.load(open('package.json'))
    
    if 'dependencies' in md or (check and 'devDependencies' in md):
        try:
            os.mkdir('node_modules')
        except OSError:
            sys.stderr.write('WARNING: node_modules already exists. Make sure you have ' +
                                'no bundled dependencies.\n')

        os.chdir('node_modules')

        if 'dependencies' in md:
            symlink_deps(md['dependencies'], check)

        if check and '--no-devdeps' not in sys.argv and 'devDependencies' in md:
            symlink_deps(md['devDependencies'], check)