#!/usr/bin/env python
#-*- coding: utf-8 -*-

# Copyright 2015-2016 Mir Calculate. http://www.calculate-linux.org
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
import argparse
import sys
import re
import os
from os import path
from itertools import chain

from calculate.lib.datavars import DataVars
from calculate.lib.cl_template import templateFunction
from calculate.lib.utils.files import readFile, listDirectory, readLinesFile
from calculate.core.result_viewer import ResultViewer
get_pkgname_by_filename = templateFunction.get_pkgname_by_filename
re_pkgname = templateFunction.reData

class ArgumentParserCheck(argparse.ArgumentParser):
    def __init__(self):
        super(ArgumentParserCheck, self).__init__(
            description="Check templates (check pkg and merge function)")

class PackageDb(object):
    def __init__(self, reps, installed_db):
        self.installed_db = installed_db
        self.reps = reps
        self.packages = {}
        self.renames = None

    def __contains__(self, key):
        if self.renames is None:
            self.load_renames()
        category, op, name = key.partition('/')
        if category not in self.packages:
            self.packages[category] = set()
            self.load_pkg_db(category)
            self.load_repos(category)
        return name in self.packages[category] or key in self.renames

    def get_newname(self, key):
        return self.renames.get(key,'')

    def load_pkg_db(self, category):
        packages = self.packages[category]
        for pkgname in listDirectory(path.join(self.installed_db,category)):
            pkg = re_pkgname.search(pkgname).group(1)
            packages.add(pkg)
        self.packages[category] = packages

    def load_repos(self, category):
        packages = self.packages[category]
        for rep_dn in self.reps:
            for pkgname in listDirectory(path.join(rep_dn,category)):
                if "." not in pkgname:
                    packages.add(pkgname)
        self.packages[category] = packages

    def load_renames(self):
        self.renames = {}
        for rep_dn in self.reps:
            for fn in listDirectory(path.join(rep_dn,"profiles/updates"),
                                    fullPath=True):
                for line in (x for x in readLinesFile(fn) if x.startswith("move ")):
                    words = [x for x in line.split() if x]
                    if len(words) == 3:
                        self.renames[words[1]] = words[2]

class ScanTemplates(object):
    reMerge = re.compile("(merge|pkg)\(([-\w/]*)(?::[^)]+?)?(?:\[[^\]]\])?\)[-!=<>]")

    CLT_SUFFIX = ".clt"

    def __init__(self, dv=None):
        if dv is None:
            dv = DataVars()
            dv.importData()
            dv.flIniFile()
        self.dv = dv
        dbpkg = '/var/db/pkg'
        reps = self.dv.Get('cl_repository_location')
        self.db = PackageDb(reps, dbpkg)

        self.rv = ResultViewer()

    def scan(self,dn):
        """
        Сканировать директорию с шаблонами
        """
        patch_dirs = []
        for root, dirs, files in os.walk(dn):
            for fn in (path.join(root,x) for x in files):
                data = readFile(fn, binary=True)
                try:
                    data_decoded = data.decode("UTF-8")
                except UnicodeDecodeError as e:
                    continue
                for fname, pkg in self.reMerge.findall(data_decoded):
                    pkg = pkg or get_pkgname_by_filename(fn)
                    if pkg not in self.db:
                        self._check_pkg(pkg, fname, fn)
                        
    def _check_pkg(self, pkg, fname, fn):
        if pkg not in self.db:
            self.rv.printERROR(
                "Package '{pkgname}' specified in "
                "the {funcname}() into "
                "'{tempname}' template is not found".format(pkgname=pkg,
                    funcname=fname, tempname=fn))
        elif self.db.get_newname(pkg):
            self.rv.printERROR(
                "Package '{pkgname}' specified in "
                "the {funcname}() into "
                "'{tempname}' template is renamed to {newname}".format(
                    pkgname=pkg, funcname=fname, tempname=fn,
                    newname=self.get_newname(pkg)))

    def scan_clt(self, dn):
        """
        Сканировать clt шаблоны
        """
        for root, dirs, files in os.walk(dn):
            for fn in (path.join(root,x) for x in files 
                       if x.endswith(self.CLT_SUFFIX)):
                data = readFile(fn, binary=True)
                try:
                    data_decoded = data.decode("UTF-8")
                except UnicodeDecodeError as e:
                    continue
                for fname, pkg in self.reMerge.findall(data_decoded):
                    pkg = pkg or get_pkgname_by_filename(fn)
                    self._check_pkg(pkg, fname, fn)

    def scan_all(self):
        template_path = self.dv.Get('main.cl_template_path')
        for dn in template_path:
            self.scan(dn)
        self.scan_clt('/etc')

if __name__=='__main__':
    apv = ArgumentParserCheck()
    args = apv.parse_args()
    ScanTemplates().scan_all()