#!/usr/bin/env python3

import argparse
import os
import sqlite3
##
from lxml import etree
##
import repo

# TODO: track which versions are built so we don't need to consistently rebuild ALL packages
# TODO: logging
# TODO: check result of build and *conditionally* cleanup if self.cleanup == True.
# TODO: print repo snippet

_dflts = {'cfgfile': '~/.config/arch_repo_builder/config.xml',
          'cache_db': '~/.cache/arch_repo_builder/packages.sqlite3'}


class Packager(object):
    def __init__(self, cfgfile = _dflts['cfgfile'], cache_db = _dflts['cache_db'], validate = True, *args, **kwargs):
        self.cfgfile = os.path.abspath(os.path.expanduser(cfgfile))
        self.cache_db = os.path.abspath(os.path.expanduser(cache_db))
        self.cfg = None
        self.xml = None
        self.schema = None
        self.ns = None
        self.repos = []
        self.db = None
        self.cur = None
        self.origdir = os.path.abspath(os.path.expanduser(os.getcwd()))
        self._initCfg(validate = validate)
        self._initDB()
        self._initRepos()

    def _initCfg(self, validate = True):
        with open(self.cfgfile, 'rb') as f:
            self.xml = etree.parse(f)
        self.xml.xinclude()
        self.cfg = self.xml.getroot()
        self.ns = self.cfg.nsmap.get(None, 'http://git.square-r00t.net/Arch_Repo_Builder/tree/')
        self.ns = '{{{0}}}'.format(self.ns)
        if validate:
            if not self.schema:
                from urllib.request import urlopen
                xsi = self.cfg.nsmap.get('xsi', 'http://www.w3.org/2001/XMLSchema-instance')
                schemaLocation = '{{{0}}}schemaLocation'.format(xsi)
                schemaURL = self.cfg.attrib.get(schemaLocation,
                                                ('http://git.square-r00t.net/Arch_Repo_Builder/plain/archrepo.xsd'))
                with urlopen(schemaURL) as url:
                    self.schema = url.read()
            self.schema = etree.XMLSchema(etree.XML(self.schema))
            self.schema.assertValid(self.xml)
        return()

    def _initDB(self):
        is_new = False
        if not os.path.isdir(os.path.dirname(self.cache_db)):
            os.makedirs(os.path.dirname(self.cache_db), exist_ok = True)
            is_new = True
        if not os.path.isfile(self.cache_db):
            is_new = True
        self.db = sqlite3.connect(self.cache_db)
        self.db.row_factory = sqlite3.Row
        self.cur = self.db.cursor()
        if is_new:
            self.cur.execute(('CREATE TABLE IF NOT EXISTS '
                              '"packages" ('
                              '"name" TEXT NOT NULL UNIQUE, '
                              '"version" TEXT NOT NULL, '
                              '"source" TEXT NOT NULL, '
                              '"repo" TEXT NOT NULL, '
                              '"sign" INTEGER NOT NULL, '
                              'PRIMARY KEY("name"))'))
            self.cur.execute(('CREATE TABLE IF NOT EXISTS '
                              '"repos" ('
                              '"name" TEXT NOT NULL UNIQUE, '
                              '"dest" TEXT NOT NULL, '
                              '"path" TEXT NOT NULL, '
                              '"sign" INTEGER NOT NULL, '
                              '"gpghome" TEXT, '
                              '"gpgkeyid" TEXT, '
                              'PRIMARY KEY("name"))'))
            self.db.commit()
        return()

    def _initRepos(self):
        for r in self.xml.findall('{0}repo'.format(self.ns)):
            self.repos.append(repo.Repo(r, ns = self.ns))
        return()

    def build(self):
        pass

        return()

    def _closeDB(self):
        if self.cur:
            self.cur.close()
        if self.db:
            self.db.close()
        return()


def parseArgs():
    args = argparse.ArgumentParser(description = 'Build Pacman packages and update a local repository')
    args.add_argument('-n', '--no-validate',
                      dest = 'validate',
                      action = 'store_false',
                      help = ('If specified, do NOT attempt to validate the config file (-c/--config)'))
    args.add_argument('-c', '--config',
                      dest = 'cfgfile',
                      default = _dflts['cfgfile'],
                      help = ('The path to the configuration file. Default: {0}').format(_dflts['cfgfile']))
    args.add_argument('-C', '--cache-db',
                      dest = 'cache_db',
                      default = _dflts['cache_db'],
                      help = ('The path to the cache DB file. Default: {0}').format(_dflts['cache_db']))
    return (args)


def main():
    args = parseArgs().parse_args()
    varargs = vars(args)
    pkgr = Packager(**varargs)
    # pkgr.buildPkgs(auronly = varargs['auronly'])
    # pkgr.createRepo()
    import pprint
    # print('PACKAGER:')
    # pprint.pprint(vars(pkgr))
    for r in pkgr.repos:
        # print('\nREPO: {0}'.format(r.name))
        # pprint.pprint(vars(r))
        # for m in r.mirrors:
        #     print('\nREPO/MIRROR: {0}/{1}'.format(r.name, type(m).__name__))
        #     pprint.pprint(vars(m))
        for p in r.packages:
            #p.extract(r.staging_dir)
            p.getPkgInfo()
            print('\nREPO/PACKAGE: {0}/{1} ({2})'.format(r.name, p.name, type(p).__name__))
            pprint.pprint(vars(p))
    return ()


if __name__ == '__main__':
    main()