from django.db import models
from django.conf import settings
from lang.models import Language
from glob import glob
import os
import os.path
import logging
import git
from translate.storage import factory

from trans.managers import TranslationManager, UnitManager
from util import is_plural, split_plural, join_plural

logger = logging.getLogger('weblate')

class Project(models.Model):
    name = models.CharField(max_length = 100)
    slug = models.SlugField(db_index = True)
    web = models.URLField()
    mail = models.EmailField()
    instructions = models.URLField()

    class Meta:
        ordering = ['name']

    @models.permalink
    def get_absolute_url(self):
        return ('trans.views.show_project', (), {'project': self.slug})

    def get_path(self):
        return os.path.join(settings.GIT_ROOT, self.slug)

    def __unicode__(self):
        return self.name

    def save(self, *args, **kwargs):
        # Create filesystem directory for storing data
        p = self.get_path()
        if not os.path.exists(p):
            os.makedirs(p)

        super(Project, self).save(*args, **kwargs)

class SubProject(models.Model):
    name = models.CharField(max_length = 100)
    slug = models.SlugField(db_index = True)
    project = models.ForeignKey(Project)
    repo = models.CharField(max_length = 200)
    branch = models.CharField(max_length = 50)
    filemask = models.CharField(max_length = 200)
    style_choices = (('po', 'GNU Gettext'), ('ts', 'Qt TS'))
    style = models.CharField(max_length = 10, choices = style_choices)

    class Meta:
        ordering = ['name']

    @models.permalink
    def get_absolute_url(self):
         return ('trans.views.show_subproject', (), {'project': self.project.slug, 'subproject': self.slug})

    def __unicode__(self):
        return '%s/%s' % (self.project.__unicode__(), self.name)

    def get_path(self):
        return os.path.join(self.project.get_path(), self.slug)

    def get_repo(self):
        '''
        Gets Git repository object.
        '''
        p = self.get_path()
        try:
            return git.Repo(p)
        except:
            return git.Repo.init(p)

    def configure_repo(self):
        '''
        Ensures repository is correctly configured and points to current remote.
        '''
        # Create/Open repo
        repo = self.get_repo()
        # Get/Create origin remote
        try:
            origin = repo.remotes.origin
        except:
            repo.git.remote('add', 'origin', self.repo)
            origin = repo.remotes.origin
        # Check remote source
        if origin.url != self.repo:
            repo.git.remote('set-url', 'origin', self.repo)
        # Update
        logging.info('updating repo %s', self.__unicode__())
        repo.git.remote('update', 'origin')

    def configure_branch(self):
        '''
        Ensures local tracking branch exists and is checkouted.
        '''
        repo = self.get_repo()
        try:
            head = repo.heads[self.branch]
        except:
            repo.git.branch('--track', self.branch, 'origin/%s' % self.branch)
            head = repo.heads[self.branch]
        repo.git.checkout(self.branch)

    def update_branch(self):
        '''
        Updates current branch to match remote (if possible).
        '''
        repo = self.get_repo()
        repo.remotes.origin.pull()
        try:
            repo.git.merge('origin/%s' % self.branch)
        except:
            repo.git.merge('--abort')
            logging.warning('failed merge on repo %s', self.__unicode__())

    def get_translation_blobs(self):
        '''
        Scans directory for translation blobs and returns them as list.
        '''
        repo = self.get_repo()
        tree = repo.tree()

        # Glob files
        files = glob(os.path.join(self.get_path(), self.filemask))
        prefix = os.path.join(self.get_path(), '')
        files = [f.replace(prefix, '') for f in files]

        # Get blobs for files
        return [(self.get_lang_code(f), f, tree[f]) for f in files]

    def create_translations(self):
        '''
        Loads translations from git.
        '''
        blobs = self.get_translation_blobs()
        for code, path, blob in blobs:
            logger.info('processing %s', path)
            Translation.objects.update_from_blob(self, code, path, blob)

    def get_lang_code(self, path):
        '''
        Parses language code from path.
        '''
        parts = self.filemask.split('*')
        return path[len(parts[0]):-len(parts[1])]

    def save(self, *args, **kwargs):
        self.configure_repo()
        self.configure_branch()
        self.update_branch()
        self.create_translations()

        super(SubProject, self).save(*args, **kwargs)

class Translation(models.Model):
    subproject = models.ForeignKey(SubProject)
    language = models.ForeignKey(Language)
    translated = models.FloatField(default = 0)
    fuzzy = models.FloatField(default = 0)
    revision = models.CharField(max_length = 40, default = '', blank = True)
    filename = models.CharField(max_length = 200)

    objects = TranslationManager()

    class Meta:
        ordering = ['language__name']

    @models.permalink
    def get_absolute_url(self):
         return ('trans.views.show_translation', (), {'project': self.subproject.slug, 'subproject': self.subproject.slug, 'lang': self.language.code})

    def __unicode__(self):
        return '%s %s' % (self.language.name, self.subproject.__unicode__())

    def update_from_blob(self, blob):
        '''
        Updates translation data from blob.
        '''
        # Check if we're not already up to date
        if self.revision == blob.hexsha:
            return

        oldunits = set(self.unit_set.all().values_list('id', flat = True))

        # Load po file
        store = factory.getobject(os.path.join(self.subproject.get_path(), self.filename))
        for unit in store.units:
            newunit = Unit.objects.update_from_unit(self, unit)
            try:
                oldunits.remove(newunit.id)
            except:
                pass

        # Delete not used units
        Unit.objects.filter(translation = self, id__in = oldunits).delete()

        # Update revision
        self.revision = blob.hexsha
        self.save()


class Unit(models.Model):
    translation = models.ForeignKey(Translation)
    location = models.TextField(default = '', blank = True)
    context = models.TextField(default = '', blank = True)
    flags = models.TextField(default = '', blank = True)
    source = models.TextField()
    target = models.TextField(default = '', blank = True)
    fuzzy = models.BooleanField(default = False)

    objects = UnitManager()

    def update_from_unit(self, unit, force):
        location = ', '.join(unit.getlocations())
        flags = '' # FIXME
        target = join_plural(unit.target.strings)
        fuzzy = unit.isfuzzy()
        if not force and location == self.location and flags == self.flags and target == self.target and fuzzy == self.fuzzy:
            return
        self.location = location
        self.flags = flags
        self.target = target
        self.fuzzy = fuzzy
        self.save(force_insert = force)

    def is_plural(self):
        return is_plural(self.source)

    def get_source_plurals(self):
        return split_plural(self.source)

    def get_target_plurals(self):
        ret = split_plural(self.target)
        plurals = self.translation.language.nplurals
        if len(ret) == plurals:
            return ret

        while len(ret) < plurals:
            ret.append('')

        while len(ret) > plurals:
            del(ret[-1])

        return ret