import re
import sys
import textwrap

import numpy
import pandas as pd

def concat(xss):
    all = []

    for xs in xss:
        all.extend(xs)

    return all

class Template(object):
    def __init__(self, name, values):
        self.name = name
        self.values = values

    def __str__(self):
        return '{{%s\n%s\n}}' % (
            self.name,
            '\n'.join(['|' + '%s=%s' % (n, v) for (n, v) in self.values]))

def parse_tags(s):
    return s.replace('\n', '').split(', ')

def extract_languages(tags):
    langs = []

    for tag in tags:
        (a, b) = tag.split('::')

        if a == 'implemented-in':
            langs.append(b)
        elif a == 'devel' and b.startswith('lang:'):
            langs.append(b.split(':')[1])

    return list(set(langs))

def munge_description(s):
    paras = s.split('\n .\n')
    return '\n\n'.join(
        textwrap.fill(para.lstrip().replace('\n', ''), 65) for para in paras)

def export(pkgs, descs, cps, cpf, name):
    pkg_cps = cps[cps['Upstream-Name'] == name]
    srcpkg_names = list(pkg_cps['_srcpkg'])
    print srcpkg_names
    binpkgs = pd.concat([
        pkgs[pkgs['Source'] == srcpkg]
        for srcpkg in srcpkg_names])
    binpkg_names = sorted(binpkgs['Package'], key=len)
    print binpkg_names
    print list(binpkgs['Package'])
    homepages = list(binpkgs['Homepage'])
    # XXX: maybe choose the one that appears the most?
    homepage = homepages[0] if homepages else ''
    tags = set(concat(
        [parse_tags(t) for t in binpkgs['Tag'] if not pd.isnull(t)]))
    print tags
    langs = [s.title() for s in extract_languages(tags)]
    print langs

    if name in binpkg_names:
        descpkg = name
    else:
        # Heuristic: choose the package with the shortest name.
        # We could try to do something smarter, like look for the common
        # prefix of the descriptions of all the binary packages.
        descpkg = binpkgs[0]

    desc = list(descs[descs['Package'] == descpkg]['Description-en'])[0]
    (short_desc, full_desc) = desc.split('\n', 1)
    full_desc = munge_description(full_desc)

    print Template('Entry', [
        ('Name', name.capitalize()),
        ('Short description', short_desc),
        ('Full description', full_desc),
        ('Homepage URL', homepage),
        ('User level', ''),
        # XXX get this information from apt-file
        ('Component programs', ''),
        ('VCS checkout command', ''),
        ('Computer languages', ', '.join(langs)),
        ('Status', ''),
        ('Is GNU', 'No')])

    print Template('Project license', [
        ('License', ''),
        ('License note', '')])

    print Template('Person', [
        ('Real name', ''),
        ('Role', ''),
        ('Email', ''),
        ('Resource URL', '')])

    print Template('Resource', [
        ('Resource kind', ''),
        ('Resource URL', '')])

    #print Template('Software category', [
    #    ('Resource kind', ''),
    #    ('Resource URL', '')])

def main():
    pkg_store = pd.HDFStore('pkg.h5')
    pkgs = pkg_store['packages']
    descs = pkg_store['descriptions']
    pkg_store.close()

    cp_store = pd.HDFStore('cp.h5')
    cpf = cp_store['cp_files']
    cps = cp_store['cp_summary']
    cp_store.close()

    args = sys.argv[1:]

    if len(args) == 0:
        srcps = sorted(set(pkgs['Source']))

        for pkgname in srcps[:100]:
            export(pkgs, descs, cps, cpf, pkgname)
    elif len(args) == 1:
        export(pkgs, descs, cps, cpf, args[0])
    else:
        raise RuntimeError()

if __name__ == '__main__':
    main()