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, user_id):
    if user_id:
      if self.user_id == self.rights.user_id:
        return True
      if self.rights.get_superuser(user_id):
        return True
      if self.rights.get(user_id, self.table(), self.id, self.manager.REPOWRITE):
        return True
    return False
  
  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