import exception

from model.base import ModelItemBase, ModelManagerBase

from model.users import User

class RepositoryRight:

  def __init__(self, user, mode):

    assert(not user or type(user) is User)

    assert(type(mode) is str)

    self.all_users = not user

    self.user = user

    self.mode = mode

class Repository(ModelItemBase):

  def __init__(self, repositories, row, user = None):

    super().__init__(repositories, row)

    self.id = int(row['id'])

    self.user_id = int(row['user_id'])

    self.name = str(row['name'])

    self.type = str(row['type'])

    self.title = str(row['title'])

    self.description = str(row['description'])

    assert(not user or (type(user) is User and user.id == self.user_id))

    self.user = user

    self.repotype = self.manager.repotypes[self.type]

    self.user_rights = None

  def get_user(self):

    if self.user == None:

      self.user = self.model.users.get_by_id(self.user_id)

    assert(self.user)

    assert(self.user.id == self.user_id)

    return self.user

  def get_user_rights(self):

    if self.user_rights is None:

      self.user_rights = list()

      rights = self.rights.get_list(target_type = self.table(), target_id = self.id)

      if self.can_update():

        self.user_rights = rights

      else:

        for i in rights:

          if i.user_id == 0 or i.user_id == self.rights.user_id:

            self.user_rights.append(i)

    assert(not self.user_rights is None)

    return self.user_rights

  def reset_cache(self):

    self.manager.reset_cache(self.id, self.user_id, self.name)

  def gen_subpath(self):

    return self.manager.gen_subpath(self.get_user().login, self.name)

  def gen_internalurl(self):

    return self.repotype.gen_internalurl( self.gen_subpath() )

  def can_write(self):

    return self.can_update() or self.rights.isallowed(self.table(), self.id, self.manager.REPOWRITE)

  def can_update(self):

    return self.user_id == self.rights.user_id or self.rights.issuperuser()

  def update(self, title, description):

    if self.can_update():

      self.connection.execute(

        'UPDATE %T SET `title`=%s, `description`=%s WHERE `id`=%d',

        self.table(), title, description, self.id )

      self.reset_cache()

    else:

      raise exception.ModelDeny()

  def can_delete(self):

    return self.user_id == self.rights.user_id or self.rights.issuperuser()

  def delete(self):

    if self.can_delete():

      self.rights.delete_list(target_type = self.table(), target_id = self.id)

      self.connection.execute(

        'DELETE FROM %T WHERE `id`=%d',

        self.table(), self.id )

      self.reset_cache()

      self.connection.call_on_commit(self.repotype.delete, self.gen_subpath())

    else:

      raise exception.ModelDeny()

  def set_user_right(self, user_id, mode, allowed, all_users = False):

    assert(all_users == (user_id == 0))

    assert(type(user_id) is int)

    if self.can_update():

      if not mode in (self.manager.READ, self.manager.REPOWRITE):

        raise exception.ModelWrongData(self.t('Wrong mode'))

      if not user_id and mode == self.manager.REPOWRITE:

        raise exception.ModelWrongData(self.t('Cannot grant write access for all users'))

      self.rights.set(user_id, self.table(), self.id, mode, allowed)

    else:

      raise exception.ModelDeny()

class Repositories(ModelManagerBase):

  READ = 'read'

  REPOWRITE = 'repowrite'

  def __init__(self, model):

    super().__init__(model)

    self.repotypes = self.server.repotypes

  def table(self):

    return 'repositories'

  def itemtype(self):

    return Repository

  def reset_cache(self, id, user_id, name):

    super().reset_cache(id)

    self.connection.cache.reset(self.table(), {'user_id': user_id, 'name': name})

  def verify_name(self, name):

    return self.model.verify_identifier(name)

  def gen_subpath(self, login, name):

    assert( self.model.verify_path_entry(login) )

    assert( self.model.verify_path_entry(name) )

    return login + '/' + name

  def can_read(self, user, id):

    assert(type(user) is User)

    assert(type(id) is int)

    return user.id == self.rights.user_id \

        or self.rights.issuperuser() \

        or self.rights.isallowed(self.table(), id, self.READ)

  def can_create(self, user):

    assert(type(user) is User)

    return user.id == self.rights.user_id or self.rights.issuperuser()

  def create(self, user, name, repotype, title, description):

    if not self.can_create(user):

      raise exception.ModelDeny()

    if not self.verify_name(name):

      raise exception.ModelWrongData(self.t('Repository name is incorrect'))

    if not type(repotype) is str or not repotype in self.repotypes:

      raise exception.ModelWrongData(self.t('Repository type is incorrect'))

    if self.get_by_name(user, name):

      raise exception.ModelWrongData(self.t('Repository already exists'))

    self.connection.execute(

      'INSERT INTO %T SET `user_id`=%d, `name`=%s, `type`=%s, `title`=%s, `description`=%s',

      self.table(), user.id, name, repotype, title, description )

    id = self.connection.insert_id()

    self.reset_cache(id, user.id, name)

    subpath = self.gen_subpath(user.login, name)

    repotype_instance = self.repotypes[repotype]

    self.connection.call_on_rollback(repotype_instance.delete, subpath)

    repotype_instance.create(subpath)

    return self.get_by_id(id, user)

  def get_by_id(self, id, user = None):

    assert(type(id) is int)

    row = self.connection.cache.row(self.table(), id)

    if not row:

      return None

    if not user:

      user = self.model.users.get_by_id(row['user_id'])

      if not user:

        return None

    if not self.can_read(user, row['id']):

      return None

    return Repository(self, row, user)

  def get_by_name(self, user, name):

    assert(type(user) is User)

    assert(type(name) is str)

    rows = self.connection.cache.select(self.table(), {'user_id': user.id, 'name': name})

    if not rows or len(rows) > 1:

      return None

    row = rows[0]

    if not self.can_read(user, row['id']):

      return None

    return Repository(self, row, user)

  def get_list(self, user):

    assert(type(user) is User)

    result = list()

    rows = self.connection.query_dict('SELECT * FROM %T WHERE `user_id`=%d ORDER BY `name`', self.table(), user.id)

    for row in rows:

      if self.can_read(user, row['id']):

        result.append(Repository(self, row, user))

    return result