from django.conf import settings
from django.contrib.auth.models import User
from django.db import models
from django.utils.translation import get_language
from django.utils.translation import ugettext_lazy as _

from shutil import copyfile
import os
import uuid

from fsutils import md5sum


class Profile(models.Model):
    """example Documentation:
    https://simpleisbetterthancomplex.com/tutorial/2016/07/22/how-to-extend-django-user-model.html#onetoone
    """
    class Meta:
        ordering = ['user__last_name', 'user__first_name']

    accountname = models.CharField(max_length=150, null=True, blank=True)

    user = models.OneToOneField(User, on_delete=models.CASCADE, related_name='profile')
    labs = models.ManyToManyField('Lab', related_name='members')

    def __str__(self):
        return '{0}, {1} <{2}>'.format(self.user.last_name, self.user.first_name, self.user.email)

    @property
    def fullname(self):
        return self.user.get_full_name()


class Institution(models.Model):
    class Meta:
        unique_together = (('abbr', 'name'))
        ordering = ['name']

    abbr = models.CharField(max_length=64, null=True, blank=True, unique=True, verbose_name=_('Abbreviation'))
    name = models.CharField(max_length=256, unique=True, verbose_name=_('Name'))

    def __str__(self):
        return self.name

    def get_identifier(self):
        if self.abbr:
            return self.abbr
        else:
            return self.name


class Lab(models.Model):
    class Meta:
        ordering = ['name']

    name = models.CharField(max_length=64, verbose_name=_('Name'))
    ldap = models.CharField(max_length=32, null=True, blank=True, verbose_name='LDAP')

    pi = models.OneToOneField(
        Profile,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        limit_choices_to={'user__groups__name': settings.AUTH_LDAP_PI_GROUP},
        related_name='pi_of')

    institution = models.ForeignKey(Institution, on_delete=models.PROTECT, related_name='labs')

    def __str__(self):
        return self.name


# Base File Objects ########
class FSFile(models.Model):
    """
    Base Model of a filesystem object
    Child classes must override path attribute to add missing values
    """

    # Allow passing an NFS path at init?
    # def __init__(self, src):
    #     self.upload_from_nfs(src)

    # def get_hash()

    path = models.FilePathField(path=settings.DATA_ROOT, max_length=256, allow_files=True, allow_folders=False)

    def upload_from_nfs(self, src):
        """
        Copy to db storage partition from a local network path
        Return new path after copy
        """
        # TODO: Code in this function will be moved to the Queuing system
        tmp_dst = settings.DATA_ROOT + "/" + str(uuid.uuid4())
        copyfile(src, tmp_dst)  # copy + hash at the same time?
        md5 = md5sum(tmp_dst).hexdigest()
        path = "{}/{}___{}".format(settings.DATA_ROOT, os.path.basename(src), md5)
        os.rename(tmp_dst, path)
        self.path = path
        self.save()


# NGS Domain Objects ########
class FastqFSFile(FSFile):
    sequencer_company = models.CharField(max_length=128, verbose_name=_('Sequencer Company'), blank=True, null=True)


class Dataset(models.Model):
    name = models.CharField(max_length=128, verbose_name=_('Name'))

    files = models.ManyToManyField(FSFile, related_name='datasets', verbose_name=_('Project Datasets'))


class Project(models.Model):

    name = models.CharField(max_length=128, verbose_name=_('Name'))

    source_lab = models.ForeignKey(Lab, on_delete=models.PROTECT, related_name='lab_projects')
    access_granted_to = models.ManyToManyField(Profile, related_name='projects', verbose_name=_('Grant Access to'))
    open_to_labs = models.ManyToManyField(Lab, related_name='projects', verbose_name=_('Open to these labs'))

    datasets = models.ManyToManyField(Dataset, related_name='projects', verbose_name=_('Project Datasets'), blank=True)




class Alert(models.Model):
    message_fr = models.TextField(null=True)
    message_en = models.TextField(null=True)
    start = models.DateTimeField()
    end = models.DateTimeField()

    @property
    def localized(self):
        if get_language() == 'en':
            return self.message_en
        else:
            return self.message_fr


class AppSettings(models.Model):
    home_institution = models.ForeignKey(Institution, null=True, blank=True, on_delete=models.SET_NULL)


# Base Object for all Processable types #######
# BETA
# class Node(models.Model):
#     projects = models.ManyToManyField(Project)
#     profiles = models.ManyToManyField(Profile)

#     @property
#     def processes(self):
#         return (self.input2process, self.output2process)

#     @property
#     def _get_node_type(self):
#         return self.__class__.__name__

#     def is_input(self):
#         return len(self.input2process) != 0

#     def is_output(self):
#         return len(self.output2process) != 0

#     def __repr__(self):
#         return '<%s(%s)>' % (self._get_node_type, self.id)


# Chemical Domain objects ########
# BETA
# class Substance(models.Model):

#     umid = models.CharField(max_length=16, null=False, unique=True)
#     smiles = models.CharField(max_length=512, null=False)

#     def __repr__(self):
#         return '<Substance : %s  %s>' % (self.umid, self.smiles)

#     @classmethod
#     def _search(cls, sql, session):
#         res = session.execute(sql)
#         rows = res.fetchall()
#         # fields = res.keys()
#         lres = []
#         for r in rows:
#             sub = session.query(Substance).filter(Substance.umid == r[1]).all()
#             lres.append(sub)

#         lres = sum(lres, [])
#         return lres

#     @classmethod
#     def exactSearch(cls, smiles, session):
#         # rdkit cartridge table is call mols ####
#         # not mapped through sql alchemy ####
#         sql = "select * from mols where m@='%s' ;" % smiles
#         return cls._search(sql, session)

#     @classmethod
#     def substrSearch(cls, smiles, session, dummyAtom=False):
#         # rdkit cartridge table is call mols ####
#         # not mapped through sql alchemy ####
#         # dummy : ####
#         sql = "select * from mols where m@>"
#         if dummyAtom:
#             sql += "mol_adjust_query_properties('%s');" % smiles
#         else:
#             sql += "'%s' ;" % smiles
#         return cls._search(sql, session)

#     @classmethod
#     def similaritySearch(cls, smiles, session):
#         # similarity search using fingerprint
#         sql = "select * from get_mfp2_neighbors('%s')" % smiles
#         rows = session.execute(sql).fetchall()
#         lres = cls._search(sql, session)
#         lres = dict([(r.umid, r) for r in lres])
#         res = []
#         for r in rows:
#             r = list(r)
#             r.append(lres[r[1]])
#             res.append(r)
#         return res


# class Compound(Node):

#     batch = models.CharField(max_length=8, null=False)
#     full_formula = models.CharField(max_length=256, null=False)
#     full_mass = models.DecimalField(max_digits=5, decimal_places=2, null=False)
#     parent_formula = models.CharField(max_length=128, null=False)
#     parent_mass = models.DecimalField(max_digits=5, decimal_places=2, null=False)

#     status = models.DecimalField(max_digits=2)
#     deleted_status = models.DecimalField(max_digits=2)

#     purpose = models.CharField(max_length=32)
#     library = models.CharField(max_length=32)
#     notebook = models.CharField(max_length=32)
#     originator = models.CharField(max_length=32)

#     supplier = models.CharField(max_length=128)
#     supplier_batch = models.CharField(max_length=64)
#     study = models.CharField(max_length=64)

#     name = models.CharField(max_length=128)
#     objtype = models.CharField(max_length=16)
#     purchase_no = models.CharField(max_length=64)
#     registered_by = models.CharField(max_length=16)
#     registered_on = models.CharField(max_length=16)

#     salt = models.CharField(max_length=16)  # example : HCL
#     salt_equivs = models.DecimalField(max_digits=5, decimal_places=2)  # 2.0
#     solvate = models.CharField(max_length=16)
#     solvate_equivs = models.DecimalField(max_digits=5, decimal_places=2)
#     solvent_name = models.CharField(max_length=16)

#     liquid_amount = models.CharField(max_length=64)
#     dry_amount = models.CharField(max_length=256)
#     appearance = models.CharField(max_length=256)
#     purity = models.CharField(max_length=256)
#     comment = models.CharField(max_length=256)

#     substance = models.ForeignKey('Substance', on_delete=models.CASCADE, related_name='compounds')

#     def __repr__(self):
#         return "<Compound : %s %s_%s>" % (self.full_formula, self.substance.umid, self.batch)

#     @property
#     def _type(self):
#         return self.__class__.__name__

#     @property
#     def _id(self):
#         return '%s_%s' % (self.substance.umid, self.batch)

#     @classmethod
#     def searchByUM_b(cls, umid, session):

#         umid, batch = umid.split('_')
#         c = session.query(Compound).filter(Compound.substance_id == Substance.id)
#         c = c.filter(Substance.umid == umid)
#         pre = c.all()
#         res = c.filter(Compound.batch == batch).all()
#         if len(res) == 0 and len(pre) > 0:
#             print('Found %s compounds with %s id but none matching batch %s : ' % (len(pre), umid, batch))
#             print(', '.join([e._id for e in pre]))
#         return res

#     @classmethod
#     def searchByUM(cls, umid, session):
#         res = session.query(Compound).filter(Compound.substance_id == Substance.id)
#         res = res.filter(Substance.umid == umid).all()
#         return res

#     def getResults(self):
#         res = []
#         for i in range(len(self.processes[0])):
#             p = self.processes[0][i].process

#             if len(p.inputs) == 1 and p.inputs[0] == self:
#                 res += p.outputs
#         return res