# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
# Written 2009 by j@mailb.org
import os
import re
from glob import glob

import oxlib
import oxlib.normalize
from django.db import models
from django.conf import settings

def getAuthor(name, name_sort=''):
    try:
        a = Author.objects.get(name=name)
    except Author.DoesNotExist:
        a = Author(name=name, name_sort=name_sort)
        a.save()
    return a

class Author(models.Model):
    name = models.CharField(blank=True, max_length=255, unique=True)
    name_sort = models.CharField('Sort Name', blank=True, max_length=1000)

    class Meta:
        ordering = ('name_sort', )

    def __unicode__(self):
        return self.name

    def save(self, *args, **kwargs):
        if not self.name_sort:
            self.name_sort = oxlib.normalize.canonicalName(self.name)
        super(Author, self).save(*args, **kwargs)
        #update path in related texts
        for text in self.texts.all():
            text.save()

class AuthorField(models.ManyToManyField):
    def save_form_data(self, instance, data):
        super(AuthorField, self).save_form_data(instance, data)
        #save instance after adding authors, file gets updated here
        instance.save()

class Language(models.Model):
    name = models.CharField(blank=True, max_length=1000)
    class Meta:
        ordering = ('name', )
    def __unicode__(self):
        return self.name

class Text(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    title = models.CharField(blank=True, max_length=1000)
    version = models.CharField(blank=True, max_length=1000)

    file = models.FileField(upload_to='tmp', blank=True, max_length=2000)
    authors = AuthorField(Author, related_name='texts', blank=True)
    languages = models.ManyToManyField(Language, related_name='texts', blank=True)
    compilation = models.BooleanField(default=False)

    class Meta:
        ordering = ('file', 'title', 'version')

    def __unicode__(self):
        return self.title

    def getComputedPath(self):
        authors = [a.name_sort for a in self.authors.all()]
        author = "; ".join(authors)
        if not author:
            author = "Unknown Author"
        if self.compilation:
            author += " (Ed.)"
        elif author.endswith("."):
            author = author[:-1] + "_"
        title = self.title
        title = re.sub('[:/]', '_', title)
        if self.version:
            title += ".%s" % self.version
        extension = os.path.splitext(self.file.path)[1].lower()
        path = u"%s/%s/%s%s" % (author[0].upper(), author, title, extension)
        return os.path.join(settings.MEDIA_ROOT, path).encode('utf-8')

    def parsePath(self):
        if self.file:
            match = re.compile('./(.*)/(.*)').findall(self.file.name)
            title = os.path.splitext(match[0][1])[0]
            compilation = False
            #FIXME: parse version
            version = re.compile("\.(\w+)$").findall(title)
            if version:
                version = version[0]
                title = title[:-(len(version) + 1)]
            else:
                version = ''
            authors = match[0][0]
            if authors.endswith("_"):
                authors = authors[:-1] + "."
            if authors.endswith(' (Ed.)'):
                authors = authors[:-len(' (Ed.)')]
                compilation = True
            if authors !=  'Unknown Author':
                authors = [(oxlib.normalize.normalizeName(a), a) for a in authors.split("; ")]
            else:
                authors = []
            
            self.title = title
            self.version = version
            self.compilation = compilation
            self.save(rename=False)
            for a in authors:
                author = getAuthor(a[0], a[1])
                self.authors.add(author)
            self.save()

    def save(self, *args, **kwargs):
        rename = True
        if "rename" in kwargs:
            rename = kwargs['rename']
            del kwargs['rename']
        super(Text, self).save(*args, **kwargs)
        if rename and self.file:
            path = self.getComputedPath()
            if path != self.file.path:
                #FIXME: make sure path is not used by other test in system
                if not os.path.exists(os.path.dirname(path)):
                    os.makedirs(os.path.dirname(path))
                old_dir = os.path.dirname(self.file.path)
                #print 'old', self.file.path
                #print 'new', path
                os.rename(self.file.path, path)
                if not glob('%s/*' % old_dir):
                    os.rmdir(old_dir)
                self.file.name = path[len(settings.MEDIA_ROOT) + 1:]
                self.save(rename=False)