#!/usr/bin/env python

# Generate a node-webkit package.json file for a website.
#
# https://github.com/rogerwang/node-webkit/wiki/Manifest-format

import os
import re
import shutil
import time
import json

def is_html(filename):
    return filename.lower().endswith(".html")

def attr(name):
    return "data-" + name + """=["']?((?:.(?!["']?\s+(?:\S+)=|[>"']))+.)["']?"""

def main(appdir, version=None):
    if not os.path.isdir(appdir):
        raise StandardError("input (%r) is not a directory" % appdir)
    indexes = []
    icons = []
    for root, dirnames, filenames in os.walk(appdir):
        root = os.path.relpath(root, appdir)
        for filename in filenames:
            if filename.lower() == "index.html":
                indexes.append(os.path.join(root, filename))
            if ("icon" in filename.lower()
                and filename.lower().endswith((".ico", ".png"))):
                icons.append(os.path.join(root, filename))

    indexes.sort(key=lambda fn: (fn.count("/"), fn))
    icons.sort(key=lambda fn: (fn.count("/"), fn))
    name = os.path.basename(appdir).split(".")[0]
    package = {
        "main": indexes[0],
        "name": name,
        "version": version or "0.0.0",
        "chromium-args": "--enable-webgl --ignore-gpu-blacklist",
        "window": {
            "show": False,
            "toolbar": False,
            "title": name,
            "min_width": 300,
            "min_height": 200,
        }
    }

    if icons:
        package["window"]["icon"] = icons[0]

    with open(os.path.join(appdir, indexes[0]), "r") as fobj:
        header = fobj.read(4096)
        try:
            title = re.search("<title>([^<]+)<", header).groups()[0]
        except AttributeError:
            print >>sys.stderr, "No <title> found in %r." % fobj.name
        else:
            package["window"]["title"] = title
        try:
            version = re.search(attr("version"), header).groups()[0]
        except AttributeError:
            print >>sys.stderr, "No version found in %r." % fobj.name
        else:
            package["version"] = version
        try:
            appid = re.search(attr("appid"), header).groups()[0]
        except AttributeError:
            print >>sys.stderr, "No appid found in %r." % fobj.name
        else:
            package["name"] = appid

    if "+" not in package["version"]:
        package["version"] += "+"
    package["version"] += time.strftime("%Y%m%d%H%M%S")

    with open(os.path.join(appdir, "package.json"), "w") as fobj:
        json.dump(package, fobj)

if __name__ == "__main__":
    import sys
    main(*sys.argv[1:])