# written 2007 by Markus Ullmann <jokey@gentoo.org>
# License: GPL-2

"""class for backend communication"""

from pkgcore.config import load_config
from pkgcore.ebuild.atom import atom
from pkgcore.ebuild.repository import UnconfiguredTree, SlavedTree
from pkgcore.restrictions.packages import OrRestriction
from pkgcore.util.repo_utils import get_raw_repos, get_virtual_repos
from snakeoil.lists import unstable_unique
from snakeoil.bash import iter_read_bash
from snakeoil.osutils import pjoin
import os
import errno
import hashlib

def file_sha1(path):
    sha1 = 'NULL'
    if os.path.exists(path):
        f = open(path, 'r')
        sha1 = hashlib.sha1(f.read()).hexdigest()
    return sha1

def file_mtime(path):
    mtime = -1
    if os.path.exists(path):
        mtime = int(os.stat(path).st_mtime)
    return mtime

class domain_repo_interface:
    """abstraction for pkgcore communication stuff"""

    def __init__(self):
        # Do not load yet
        self.config = None
        self.config = load_config()
        self.current_domain = None
        self.current_repo = None

    def load_config(self):
        self.config = load_config()

    def get_domainlist(self):
        domainlist = []
        for domain in self.config.domain.iterkeys():
            domainlist.append(domain)
        return domainlist

    def get_domain_by_name(self, domaintext):
        return self.config.domain[domaintext]

    def set_domain_by_name(self, domaintext):
        self.current_domain_text = domaintext
        self.current_domain = self.get_domain_by_name(domaintext)
        self.fill_repolist()

    def get_repolist(self, domain=None):
        if domain is None:
            domain = self.current_domain
        repolist = []
        for repo in get_virtual_repos(get_raw_repos(domain.repos), False):
            if not isinstance(repo, UnconfiguredTree) and not isinstance(
                repo, SlavedTree):
                continue
            repolist.append(repo)
        return repolist

    def get_repolist_ids(self,domain=None):
        idlist = []
        if domain is None:
            domain = self.current_domain
        for repo in self.get_repolist(domain):
            idlist.append(repo.repo_id)
        return idlist

    def fill_repolist(self):
        self.repolist = self.get_repolist()

    @property
    def repo_id_list(self):
        for repo in self.repolist:
            yield repo.repo_id

    def set_work_repo_by_id(self, repo_id):
        for repo in get_virtual_repos(get_raw_repos(
            self.current_domain.repos), False):
            if repo.repo_id == repo_id:
                self.current_repo = repo
                break
        self.fetch_packagemask_content()

    def set_work_repo_by_location(self, repo_location):
        for repo in get_virtual_repos(get_raw_repos(
            self.current_domain.repos), False):
            if repo.location == repo_location:
                self.current_repo = repo
                break
        self.fetch_packagemask_content()

    def fetch_packagemask_content(self):
        self.pmaskatoms = {}
        try:
            d = {}
            for line in iter_read_bash(pjoin(
                self.current_repo.location, "profiles/package.mask")):
                newatom = atom(line.strip())
                d.setdefault(newatom.key, []).append(newatom)
        except IOError, oe:
            if oe.errno != errno.ENOENT:
                raise
        self.pmaskatoms = dict((k, OrRestriction(*unstable_unique(v)))
            for k,v in d.iteritems())

    @property
    def work_repo_location(self):
        return self.current_repo.location

    @property
    def all_packages_list(self):
        return self.current_repo.versions
    
    @property
    def pmask_packages_list(self):
        for i in self.pmaskatoms.keys():
            yield i.split('/',2)

    def get_changelog_meta(self, (category, package)):
        """Return the changelog mtime and SHA1"""
        filename = pjoin(self.current_repo.location, 
                    category, package, "ChangeLog")
        mtime = file_mtime(filename)
        sha1 = file_sha1(filename)
        return (mtime, sha1)
    
    def get_manifest_meta(self, (category, package)):
        """Return the Manifest mtime and SHA1"""
        filename = pjoin(self.current_repo.location, 
                    category, package, "Manifest")
        mtime = file_mtime(filename)
        sha1 = file_sha1(filename)
        return (mtime, sha1)

    def get_changelog(self, (category, package)):
        """Return the changelog contents"""
        filename = pjoin(self.current_repo.location, 
                    category, package, "ChangeLog")
        try:
            changelogfile = open(filename)
        except IOError, oe:
            if oe.errno not in (errno.ENOENT, ):
                raise
            return "No ChangeLog file there"

        text = ""
        for line in changelogfile:
            text += unicode(line, 'utf-8')
        changelogfile.close()
        return text

    def get_app_metadata(self,(category, package)):
        package_atom = atom("%s/%s" % (category, package))
        pkg = max(self.current_repo.itermatch(package_atom, sorter=sorted))

        description = unicode(getattr(pkg, 'description', None))
        homepage = getattr(pkg, 'homepage', None)
        license = getattr(pkg, 'license', None)

        return (description, homepage, license)

    def get_package_keywords_dict(self, (category, package)):
        package_atom = atom("%s/%s" % (category, package))
        package_dict = {}
        for pkg in self.current_repo.itermatch(package_atom, sorter=sorted):
            keyword_dict = {}
            if pkg.key in self.pmaskatoms and self.pmaskatoms[pkg.key].match(pkg):
                pkgmask_prefix = "M"
            else:
                pkgmask_prefix = ""

            for keyword in pkg.keywords:
                if keyword.startswith('-'):
                    keyword_dict[keyword[1:]] = pkgmask_prefix + '-'
                elif keyword.startswith('~'):
                    keyword_dict[keyword[1:]] = pkgmask_prefix + '~'
                else:
                    keyword_dict[keyword] = pkgmask_prefix + '+'

            efilename = package + "-" + pkg.fullver + ".ebuild"
            epath = pjoin(self.work_repo_location, category, package, efilename)
            mtime = file_mtime(epath)
            sha1 = file_sha1(epath)
            yield (pkg.versioned_atom.fullver, keyword_dict, mtime, sha1)

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