"""repo mirror columns

Revision ID: 34c8ef052ec9
Revises: c059b952ed76
Create Date: 2019-10-07 13:11:20.424715

"""

# revision identifiers, used by Alembic.
revision = '34c8ef052ec9'
down_revision = 'cc6778199cdb'

from alembic import op
from alembic import op as original_op
from data.migrations.progress import ProgressWrapper
from datetime import datetime
import sqlalchemy as sa
from sqlalchemy.dialects import mysql
from peewee import ForeignKeyField, DateTimeField, BooleanField
from data.database import (BaseModel, RepoMirrorType, RepoMirrorStatus, RepoMirrorRule, uuid_generator,
                           QuayUserField, Repository, IntegerField, JSONField)
from data.fields import EnumField as ClientEnumField, CharField, EncryptedCharField

import logging

logger = logging.getLogger(__name__)

BATCH_SIZE = 10


# Original model
class RepoMirrorConfig(BaseModel):
  """
  Represents a repository to be mirrored and any additional configuration
  required to perform the mirroring.
  """
  repository = ForeignKeyField(Repository, index=True, unique=True, backref='mirror')
  creation_date = DateTimeField(default=datetime.utcnow)
  is_enabled = BooleanField(default=True)

  # Mirror Configuration
  mirror_type = ClientEnumField(RepoMirrorType, default=RepoMirrorType.PULL)
  internal_robot = QuayUserField(allows_robots=True, null=True, backref='mirrorpullrobot',
                                 robot_null_delete=True)
  external_reference = CharField()
  external_registry = CharField()
  external_namespace = CharField()
  external_repository = CharField()
  external_registry_username = EncryptedCharField(max_length=2048, null=True)
  external_registry_password = EncryptedCharField(max_length=2048, null=True)
  external_registry_config = JSONField(default={})

  # Worker Queuing
  sync_interval = IntegerField()  # seconds between syncs
  sync_start_date = DateTimeField(null=True)  # next start time
  sync_expiration_date = DateTimeField(null=True)  # max duration
  sync_retries_remaining = IntegerField(default=3)
  sync_status = ClientEnumField(RepoMirrorStatus, default=RepoMirrorStatus.NEVER_RUN)
  sync_transaction_id = CharField(default=uuid_generator, max_length=36)

  # Tag-Matching Rules
  root_rule = ForeignKeyField(RepoMirrorRule)


def _iterate(model_class, clause):
  while True:
    has_rows = False
    for row in list(model_class.select().where(clause).limit(BATCH_SIZE)):
      has_rows = True
      yield row

    if not has_rows:
      break


def upgrade(tables, tester, progress_reporter):
  op = ProgressWrapper(original_op, progress_reporter)

  logger.info('Migrating to external_reference from existing columns')

  op.add_column('repomirrorconfig', sa.Column('external_reference', sa.Text(), nullable=True))

  for repo_mirror in _iterate(RepoMirrorConfig, (RepoMirrorConfig.external_reference >> None)):
    repo = '%s/%s/%s' % (repo_mirror.external_registry, repo_mirror.external_namespace, repo_mirror.external_repository)
    logger.info('migrating %s' % repo)
    repo_mirror.external_reference = repo
    repo_mirror.save()

  op.drop_column('repomirrorconfig', 'external_registry')
  op.drop_column('repomirrorconfig', 'external_namespace')
  op.drop_column('repomirrorconfig', 'external_repository')

  op.alter_column('repomirrorconfig', 'external_reference', nullable=False, existing_type=sa.Text())


  tester.populate_column('repomirrorconfig', 'external_reference', tester.TestDataType.String)


def downgrade(tables, tester, progress_reporter):
  op = ProgressWrapper(original_op, progress_reporter)

  '''
  This will downgrade existing data but may not exactly match previous data structure. If the
  external_reference does not have three parts (registry, namespace, repository) then a failed
  value is inserted.
  '''

  op.add_column('repomirrorconfig', sa.Column('external_registry', sa.String(length=255), nullable=True))
  op.add_column('repomirrorconfig', sa.Column('external_namespace', sa.String(length=255), nullable=True))
  op.add_column('repomirrorconfig', sa.Column('external_repository', sa.String(length=255), nullable=True))

  logger.info('Restoring columns from external_reference')
  for repo_mirror in _iterate(RepoMirrorConfig, (RepoMirrorConfig.external_registry >> None)):
    logger.info('Restoring %s' % repo_mirror.external_reference)
    parts = repo_mirror.external_reference.split('/', 2)
    repo_mirror.external_registry = parts[0] if len(parts) >= 1 else 'DOWNGRADE-FAILED'
    repo_mirror.external_namespace = parts[1] if len(parts) >= 2 else 'DOWNGRADE-FAILED'
    repo_mirror.external_repository = parts[2] if len(parts) >= 3 else 'DOWNGRADE-FAILED'
    repo_mirror.save()

  op.drop_column('repomirrorconfig', 'external_reference')

  op.alter_column('repomirrorconfig', 'external_registry', nullable=False, existing_type=sa.String(length=255))
  op.alter_column('repomirrorconfig', 'external_namespace', nullable=False, existing_type=sa.String(length=255))
  op.alter_column('repomirrorconfig', 'external_repository', nullable=False, existing_type=sa.String(length=255))