"""back fill build expand_config

Revision ID: a6c463dfb9fe
Revises: b4df55dea4b3
Create Date: 2017-03-17 10:00:19.739858

"""

# revision identifiers, used by Alembic.
import json
import os

from peewee import *
from data.database import BaseModel

revision = 'a6c463dfb9fe'
down_revision = 'b4df55dea4b3'

from alembic import op


class RepositoryBuildTrigger(BaseModel):
  config = TextField(default='{}')

def upgrade(tables, tester):
  repostioryBuildTriggers = RepositoryBuildTrigger.select()
  for repositoryBuildTrigger in repostioryBuildTriggers:
    config = json.loads(repositoryBuildTrigger.config)
    repositoryBuildTrigger.config = json.dumps(get_config_expand(config))
    repositoryBuildTrigger.save()


def downgrade(tables, tester):
  repostioryBuildTriggers = RepositoryBuildTrigger.select()
  for repositoryBuildTrigger in repostioryBuildTriggers:
    config = json.loads(repositoryBuildTrigger.config)
    repositoryBuildTrigger.config = json.dumps(get_config_expand(config))
    repositoryBuildTrigger.save()


def create_context(current_subdir):
  if current_subdir == "":
    current_subdir = os.path.sep + current_subdir

  if current_subdir[len(current_subdir) - 1] != os.path.sep:
    current_subdir += os.path.sep

  context, _ = os.path.split(current_subdir)
  return context


def create_dockerfile_path(current_subdir):
  if current_subdir == "":
    current_subdir = os.path.sep + current_subdir

  if current_subdir[len(current_subdir) - 1] != os.path.sep:
    current_subdir += os.path.sep

  return current_subdir + "Dockerfile"


def get_config_expand(config):
  """ A function to transform old records into new records """
  if not config:
    return config

  # skip records that have been updated
  if "context" in config or "dockerfile_path" in config:
    return config

  config_expand = {}
  if "subdir" in config:
    config_expand = dict(config)
    config_expand["context"] = create_context(config["subdir"])
    config_expand["dockerfile_path"] = create_dockerfile_path(config["subdir"])

  return config_expand


def get_config_contract(config):
  """ A function to delete context and dockerfile_path from config """
  if not config:
    return config

  if "context" in config:
    del config["context"]

  if "dockerfile_path" in config:
    del config["dockerfile_path"]

  return config