from django.db import models
from django.db.models import Q
from django.contrib.auth.models import User
from django.contrib.sites.models import Site

from main.utils import cache_function
from packages.models import PackageRelation

###########################
### User Profile Class ####
###########################
class UserProfile(models.Model):
    id = models.AutoField(primary_key=True) # not technically needed
    notify = models.BooleanField(
        "Send notifications",
        default=True,
        help_text="When enabled, send user 'flag out of date' notifications")
    alias = models.CharField(
        max_length=50,
        help_text="Required field")
    public_email = models.CharField(
        max_length=50,
        help_text="Required field")
    other_contact = models.CharField(max_length=100, null=True, blank=True)
    website = models.CharField(max_length=200, null=True, blank=True)
    yob = models.IntegerField(null=True, blank=True)
    location = models.CharField(max_length=50, null=True, blank=True)
    languages = models.CharField(max_length=50, null=True, blank=True)
    interests = models.CharField(max_length=255, null=True, blank=True)
    occupation = models.CharField(max_length=50, null=True, blank=True)
    roles = models.CharField(max_length=255, null=True, blank=True)
    favorite_distros = models.CharField(max_length=255, null=True, blank=True)
    picture = models.FileField(upload_to='devs', default='devs/silhouette.png')
    user = models.ForeignKey(
        User, related_name='userprofile_user', unique=True)
    allowed_repos = models.ManyToManyField('Repo', blank=True)
    class Meta:
        db_table = 'user_profiles'
        verbose_name = 'Additional Profile Data'
        verbose_name_plural = 'Additional Profile Data'


#######################
### Manager Classes ###
#######################
class TodolistManager(models.Manager):
    def incomplete(self):
        return self.filter(todolistpkg__complete=False).distinct()

class PackageManager(models.Manager):
    def flagged(self):
        return self.get_query_set().filter(flag_date__isnull=False)

#############################
### General Model Classes ###
#############################
TIER_CHOICES = (
    (0, 'Tier 0'),
    (1, 'Tier 1'),
    (2, 'Tier 2'),
    (-1, 'Untiered'),
)

class Mirror(models.Model):
    name = models.CharField(max_length=255)
    tier = models.SmallIntegerField(default=2, choices=TIER_CHOICES)
    upstream = models.ForeignKey('self', null=True)
    country = models.CharField(max_length=255, db_index=True)
    admin_email = models.EmailField(max_length=255, blank=True)
    public = models.BooleanField(default=True)
    active = models.BooleanField(default=True)
    isos = models.BooleanField(default=True)
    rsync_user = models.CharField(max_length=50, blank=True, default='')
    rsync_password = models.CharField(max_length=50, blank=True, default='')
    notes = models.TextField(blank=True)

    class Meta:
        ordering = ('country', 'name')

    def __unicode__(self):
        return self.name

    def supported_protocols(self):
        protocols = MirrorProtocol.objects.filter(urls__mirror=self).distinct()
        return ", ".join([p.protocol for p in protocols])

class MirrorProtocol(models.Model):
    protocol = models.CharField(max_length=10, unique=True)
    def __unicode__(self):
        return self.protocol
    class Meta:
        verbose_name = 'Mirror Protocol'

class MirrorUrl(models.Model):
    url = models.CharField(max_length=255)
    protocol = models.ForeignKey(MirrorProtocol, related_name="urls")
    mirror = models.ForeignKey(Mirror, related_name="urls")
    def __unicode__(self):
        return self.url
    class Meta:
        verbose_name = 'Mirror URL'

class MirrorRsync(models.Model):
    ip = models.CharField(max_length=24)
    mirror = models.ForeignKey(Mirror, related_name="rsync_ips")
    def __unicode__(self):
        return "%s" % (self.ip)
    class Meta:
        verbose_name = 'Mirror Rsync IP'

class Donor(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=255, unique=True)

    def __unicode__(self):
        return self.name

    class Meta:
        db_table = 'donors'
        ordering = ['name']

class News(models.Model):
    id = models.AutoField(primary_key=True)
    author = models.ForeignKey(User, related_name='news_author')
    postdate = models.DateField(auto_now_add=True)
    title = models.CharField(max_length=255)
    content = models.TextField()
    def __unicode__(self):
        return self.title
    class Meta:
        db_table = 'news'
        verbose_name_plural = 'news'
        get_latest_by = 'postdate'
        ordering = ['-postdate', '-id']

    def get_absolute_url(self):
        return '/news/%i/' % self.id

class Arch(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=255,unique=True)
    def __unicode__(self):
        return self.name
    class Meta:
        db_table = 'arches'
        ordering = ['name']
        verbose_name_plural = 'arches'

class Repo(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=255,unique=True)
    testing = models.BooleanField(default=False,
        help_text="Is this repo meant for package testing?")
    def __unicode__(self):
        return self.name
    class Meta:
        db_table = 'repos'
        ordering = ['name']
        verbose_name_plural = 'repos'

class Package(models.Model):
    id = models.AutoField(primary_key=True)
    repo = models.ForeignKey(Repo, related_name="packages")
    arch = models.ForeignKey(Arch, related_name="packages")
    pkgname = models.CharField(max_length=255, db_index=True)
    pkgbase = models.CharField(max_length=255, db_index=True)
    pkgver = models.CharField(max_length=255)
    pkgrel = models.CharField(max_length=255)
    pkgdesc = models.CharField(max_length=255, null=True)
    url = models.CharField(max_length=255, null=True)
    filename = models.CharField(max_length=255)
    compressed_size = models.PositiveIntegerField(null=True)
    installed_size = models.PositiveIntegerField(null=True)
    build_date = models.DateTimeField(null=True)
    last_update = models.DateTimeField(null=True, blank=True)
    files_last_update = models.DateTimeField(null=True, blank=True)
    license = models.CharField(max_length=255, null=True)
    flag_date = models.DateTimeField(null=True)

    objects = PackageManager()
    class Meta:
        db_table = 'packages'
        ordering = ('pkgname',)
        #get_latest_by = 'last_update'
        #ordering = ('-last_update',)

    def __unicode__(self):
        return self.pkgname

    def get_absolute_url(self):
        return '/packages/%s/%s/%s/' % (self.repo.name.lower(),
                self.arch.name, self.pkgname)

    def get_full_url(self, proto='http'):
        '''get a URL suitable for things like email including the domain'''
        domain = Site.objects.get_current().domain
        return '%s://%s%s' % (proto, domain, self.get_absolute_url())

    @property
    def maintainers(self):
        return User.objects.filter(
                package_relations__pkgbase=self.pkgbase,
                package_relations__type=PackageRelation.MAINTAINER)

    @property
    def signoffs(self):
        if 'signoffs_cache' in dir(self):
            if len(self.signoffs_cache) > 0:
                print self.signoffs_cache
            return self.signoffs_cache
        self.signoffs_cache = list(Signoff.objects.filter(
            pkg=self,
            pkgver=self.pkgver,
            pkgrel=self.pkgrel))
        return self.signoffs_cache

    def approved_for_signoff(self):
        return len(self.signoffs) >= 2

    @cache_function(300)
    def get_requiredby(self):
        """
        Returns a list of package objects.
        """
        requiredby = Package.objects.select_related('arch', 'repo').filter(
                packagedepend__depname=self.pkgname,
                arch__name__in=(self.arch.name, 'any')).distinct()
        return requiredby.order_by('pkgname')

    @cache_function(300)
    def get_depends(self):
        """
        Returns a list of dicts. Each dict contains ('pkg' and 'dep').
        If it represents a found package both vars will be available;
        else pkg will be None if it is a 'virtual' dependency.
        """
        deps = []
        # TODO: we can use list comprehension and an 'in' query to make this more effective
        for dep in self.packagedepend_set.order_by('depname'):
            pkgs = Package.objects.select_related('arch', 'repo').filter(pkgname=dep.depname)
            if self.arch.name != 'any':
                # make sure we match architectures if possible
                pkgs = pkgs.filter(arch__name__in=(self.arch.name, 'any'))
            if len(pkgs) == 0:
                # couldn't find a package in the DB
                # it should be a virtual depend (or a removed package)
                pkg = None
            elif len(pkgs) == 1:
                pkg = pkgs[0]
            else:
                # more than one package, see if we can't shrink it down
                # grab the first though in case we fail
                pkg = pkgs[0]
                if self.repo.testing:
                    pkgs = pkgs.filter(repo__testing=True)
                else:
                    pkgs = pkgs.filter(repo__testing=False)
                if len(pkgs) > 0:
                    pkg = pkgs[0]
            deps.append({'dep': dep, 'pkg': pkg})
        return deps

    def base_package(self):
        """
        Locate the base package for this package. It may be this very package,
        or if it was built in a way that the base package isn't real, will
        return None.
        """
        try:
            # start by looking for something in this repo
            return Package.objects.get(arch=self.arch,
                    repo=self.repo, pkgname=self.pkgbase)
        except Package.DoesNotExist:
            # this package might be split across repos? just find one
            # that matches the correct [testing] repo flag
            pkglist = Package.objects.filter(arch=self.arch,
                    repo__testing=self.repo.testing, pkgname=self.pkgbase)
            if len(pkglist) > 0:
                return pkglist[0]
            return None

    def split_packages(self):
        """
        Return all packages that were built with this one (e.g. share a pkgbase
        value). The package this method is called on will never be in the list,
        and we will never return a package that does not have the same
        repo.testing flag. For any non-split packages, the return value will be
        an empty list.
        """
        return Package.objects.filter(arch=self.arch,
                repo__testing=self.repo.testing, pkgbase=self.pkgbase).exclude(id=self.id)

    def get_svn_link(self, svnpath):
        linkbase = "http://repos.archlinux.org/wsvn/%s/%s/%s/"
        repo = self.repo.name.lower()
        if repo.startswith('community'):
            root = 'community'
        else:
            root = 'packages'
        return linkbase % (root, self.pkgbase, svnpath)

    def get_arch_svn_link(self):
        repo = self.repo.name.lower()
        return self.get_svn_link("repos/%s-%s" % (repo, self.arch.name))

    def get_trunk_svn_link(self):
        return self.get_svn_link("trunk")

    def get_bugs_link(self):
        repo = self.repo.name.lower()
        if repo.startswith('community'):
            project = 5
        else:
            project = 1
        return "http://bugs.archlinux.org/?project=%d&string=%s" % \
                (project, self.pkgname)

    def is_same_version(self, other):
        'is this package similar, name and version-wise, to another'
        return self.pkgname == other.pkgname \
                and self.pkgver == other.pkgver \
                and self.pkgrel == other.pkgrel


class Signoff(models.Model):
    pkg = models.ForeignKey(Package)
    pkgver = models.CharField(max_length=255)
    pkgrel = models.CharField(max_length=255)
    packager = models.ForeignKey(User)

class PackageFile(models.Model):
    id = models.AutoField(primary_key=True)
    pkg = models.ForeignKey('Package')
    path = models.CharField(max_length=255)
    class Meta:
        db_table = 'package_files'

class PackageDepend(models.Model):
    id = models.AutoField(primary_key=True)
    pkg = models.ForeignKey('Package')
    depname = models.CharField(db_index=True, max_length=255)
    depvcmp = models.CharField(max_length=255)
    class Meta:
        db_table = 'package_depends'

class Todolist(models.Model):
    id = models.AutoField(primary_key=True)
    creator = models.ForeignKey(User)
    name = models.CharField(max_length=255)
    description = models.TextField()
    date_added = models.DateField(auto_now_add=True)
    objects = TodolistManager()
    def __unicode__(self):
        return self.name

    @property
    def packages(self):
        # select_related() does not use LEFT OUTER JOIN for nullable ForeignKey
        # fields. That is why we need to explicitly list the ones we want.
        return TodolistPkg.objects.select_related(
            'pkg__repo', 'pkg__arch').filter(list=self).order_by('pkg')

    @property
    def package_names(self):
        return '\n'.join(set([p.pkg.pkgname for p in self.packages]))

    class Meta:
        db_table = 'todolists'

    def get_absolute_url(self):
        return '/todo/%i/' % self.id

class TodolistPkg(models.Model):
    id = models.AutoField(primary_key=True)
    list = models.ForeignKey('Todolist')
    pkg = models.ForeignKey('Package')
    complete = models.BooleanField(default=False)
    class Meta:
        db_table = 'todolist_pkgs'
        unique_together = (('list','pkg'),)

# vim: set ts=4 sw=4 et: