#!/usr/bin/env python
from __future__ import absolute_import

import argparse
import os
import subprocess
import sys
import json

# check for the venv
from lib import sanity_check
sanity_check.check_venv(__file__)

sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.settings'
from django.conf import settings

os.chdir(settings.DEPLOY_ROOT)
STATIC_PATH = 'static/'


def run():
    # type: () -> None
    """Builds for production, writing the output to disk"""
    subprocess.check_call(['node', 'node_modules/.bin/webpack'] +
                          ['--config', 'tools/webpack.production.config.js', '-p'])

def run_watch(port):
    # type: (str) -> None
    """watches and rebuilds on changes, serving files from memory via webpack-dev-server"""
    subprocess.Popen(['node', 'node_modules/.bin/webpack-dev-server'] +
                     ['--config', 'tools/webpack.dev.config.js', '--watch-poll', '--port', port])

def run_test():
    # type: () -> None
    """Generates a stub asset stat file for django so backend test can render a page"""
    entries = {}
    with open('tools/webpack.assets.json') as json_data:
        for entry in json.load(json_data).keys():
            entries[entry] = [{
                "name": "%s.js" % (entry,),
                "publicPath": "http://localhost:3000/webpack-stub/%s-stubentry.js" % (entry,),
                "path": "/stubfolder/%s-stubfile.js" % (entry,)
            }]
    stat_data = {
        "status": "done",
        "chunks": entries
    }
    directory = os.path.join(STATIC_PATH, 'webpack-bundles')
    if not os.path.exists(directory):
        os.makedirs(directory)
    with open(os.path.join(directory, 'webpack-stats-test.json'), 'w') as outfile:
        json.dump(stat_data, outfile)


parser = argparse.ArgumentParser()
parser.add_argument('--test',
                    action='store_true', dest='test', default=False,
                    help='generate a stub webpack-stats.json file (for backend testing)')
parser.add_argument('--watch',
                    action='store_true', dest='watch', default=False,
                    help='watch for changes to source files (for development)')
parser.add_argument('--port',
                    action='store', dest='port',
                    default='9994', help='set the port for the webpack server to run on')

args = parser.parse_args()
if args.test:
    run_test()
elif args.watch:
    run_watch(args.port)
else:
    run()