from nanoid import generate


class DBModel:
  def __init__(self, connection, cursor):
    self.connection = connection
    self.cursor = cursor

  def login(self, email):
    self.cursor.execute("SELECT * FROM accounts WHERE email = %s", (email, ))
    if len(self.cursor.fetchall()) == 0:
      self.cursor.execute("INSERT INTO accounts (email) VALUES (%s)", (email, ))

    self.cursor.execute("SELECT token FROM login_tokens WHERE email = %s", (email, ))
    if len(self.cursor.fetchall()) > 2:
      return None

    token = generate()
    self.cursor.execute("INSERT INTO login_tokens (email, token) VALUES (%s, %s)", (email, token))
    self.connection.commit()

    return token
    
  def consume_token(self, token):
    self.cursor.execute("SELECT email FROM login_tokens WHERE token = %s", (token, ))
    rows = self.cursor.fetchall()
    if len(rows) > 0:
      email = rows[0][0]
      self.cursor.execute("DELETE FROM login_tokens WHERE email = %s", (email, ))
      self.connection.commit()
      return email
    return None

  def all_vm_ids(self,):
    self.cursor.execute("SELECT id FROM vms")
    return map(lambda x: x[0], self.cursor.fetchall()) 

  def operating_systems_dict(self,):
    self.cursor.execute("SELECT id, template_image_file_name, description FROM os_images")

    operatingSystems = dict()
    for row in self.cursor.fetchall():
      operatingSystems[row[0]] = dict(template_image_file_name=row[1], description=row[2])

    return operatingSystems

  def vm_sizes_dict(self,):
    self.cursor.execute("SELECT id, dollars_per_month, vcpus, memory_mb, bandwidth_gb_per_month FROM vm_sizes")

    vmSizes = dict()
    for row in self.cursor.fetchall():
      vmSizes[row[0]] = dict(dollars_per_month=row[1], vcpus=row[2], memory_mb=row[3], bandwidth_gb_per_month=row[4])

    return vmSizes

  def list_ssh_public_keys_for_account(self, email):
    self.cursor.execute("SELECT name, content FROM ssh_public_keys WHERE email = %s", (email, ))
    return map(
      lambda x: dict(name=x[0], content=x[1]), 
      self.cursor.fetchall()
    )

  def list_vms_for_account(self, email):
    self.cursor.execute(""" 
      SELECT vms.id, vms.last_seen_ipv4, vms.last_seen_ipv6, vms.size, os_images.description, vms.created, vms.deleted
      FROM vms JOIN os_images on os_images.id = vms.os
      WHERE vms.email = %s""", 
      (email, )
    )
    return map(
      lambda x: dict(id=x[0], ipv4=x[1], ipv6=x[2], size=x[3], os=x[4], created=x[5], deleted=x[6]), 
      self.cursor.fetchall()
    )

  def create_vm(self, email, id, size, os):
    self.cursor.execute(""" 
      INSERT INTO vms (email, id, size, os)
      VALUES  (%s, %s, %s, %s)
      """, 
      (email, id, size, os)
    )
    self.connection.commit()