""" Create, list and manage build triggers. """

import json
import logging

from flask import request, url_for
from urllib import quote
from urlparse import urlunparse

from app import app
from buildtrigger.basehandler import BuildTriggerHandler
from buildtrigger.triggerutil import (TriggerDeactivationException,
                                      TriggerActivationException, EmptyRepositoryException,
                                      RepositoryReadException, TriggerStartException)
from endpoints.api import (RepositoryParamResource, nickname, resource, require_repo_admin,
                           log_action, request_error, query_param, parse_args, internal_only,
                           validate_json_request, api, Unauthorized, NotFound, InvalidRequest,
                           path_param)
from endpoints.api.build import build_status_view, trigger_view, RepositoryBuildStatus
from endpoints.building import start_build
from data import model
from auth.permissions import (UserAdminPermission, AdministerOrganizationPermission,
                              ReadRepositoryPermission)
from util.names import parse_robot_username
from util.dockerfileparse import parse_dockerfile


logger = logging.getLogger(__name__)


def _prepare_webhook_url(scheme, username, password, hostname, path):
  auth_hostname = '%s:%s@%s' % (quote(username), quote(password), hostname)
  return urlunparse((scheme, auth_hostname, path, '', '', ''))


@resource('/v1/repository/<apirepopath:repository>/trigger/')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
class BuildTriggerList(RepositoryParamResource):
  """ Resource for listing repository build triggers. """

  @require_repo_admin
  @nickname('listBuildTriggers')
  def get(self, namespace, repository):
    """ List the triggers for the specified repository. """
    triggers = model.build.list_build_triggers(namespace, repository)
    return {
      'triggers': [trigger_view(trigger, can_admin=True) for trigger in triggers]
    }


@resource('/v1/repository/<apirepopath:repository>/trigger/<trigger_uuid>')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('trigger_uuid', 'The UUID of the build trigger')
class BuildTrigger(RepositoryParamResource):
  """ Resource for managing specific build triggers. """

  @require_repo_admin
  @nickname('getBuildTrigger')
  def get(self, namespace, repository, trigger_uuid):
    """ Get information for the specified build trigger. """
    try:
      trigger = model.build.get_build_trigger(trigger_uuid)
    except model.InvalidBuildTriggerException:
      raise NotFound()

    return trigger_view(trigger, can_admin=True)

  @require_repo_admin
  @nickname('deleteBuildTrigger')
  def delete(self, namespace, repository, trigger_uuid):
    """ Delete the specified build trigger. """
    try:
      trigger = model.build.get_build_trigger(trigger_uuid)
    except model.InvalidBuildTriggerException:
      raise NotFound()

    handler = BuildTriggerHandler.get_handler(trigger)
    if handler.is_active():
      try:
        handler.deactivate()
      except TriggerDeactivationException as ex:
        # We are just going to eat this error
        logger.warning('Trigger deactivation problem: %s', ex)

      log_action('delete_repo_trigger', namespace,
                 {'repo': repository, 'trigger_id': trigger_uuid,
                  'service': trigger.service.name},
                 repo=model.repository.get_repository(namespace, repository))

    trigger.delete_instance(recursive=True)

    if trigger.write_token is not None:
      trigger.write_token.delete_instance()

    return 'No Content', 204


@resource('/v1/repository/<apirepopath:repository>/trigger/<trigger_uuid>/subdir')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('trigger_uuid', 'The UUID of the build trigger')
@internal_only
class BuildTriggerSubdirs(RepositoryParamResource):
  """ Custom verb for fetching the subdirs which are buildable for a trigger. """
  schemas = {
    'BuildTriggerSubdirRequest': {
      'type': 'object',
      'description': 'Arbitrary json.',
    },
  }

  @require_repo_admin
  @nickname('listBuildTriggerSubdirs')
  @validate_json_request('BuildTriggerSubdirRequest')
  def post(self, namespace, repository, trigger_uuid):
    """ List the subdirectories available for the specified build trigger and source. """
    try:
      trigger = model.build.get_build_trigger(trigger_uuid)
    except model.InvalidBuildTriggerException:
      raise NotFound()

    user_permission = UserAdminPermission(trigger.connected_user.username)
    if user_permission.can():
      new_config_dict = request.get_json()
      handler = BuildTriggerHandler.get_handler(trigger, new_config_dict)

      try:
        subdirs = handler.list_build_subdirs()
        return {
          'subdir': subdirs,
          'status': 'success'
        }
      except EmptyRepositoryException as exc:
        return {
          'status': 'success',
          'subdir': []
        }
      except RepositoryReadException as exc:
        return {
          'status': 'error',
          'message': exc.message
        }
    else:
      raise Unauthorized()


@resource('/v1/repository/<apirepopath:repository>/trigger/<trigger_uuid>/activate')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('trigger_uuid', 'The UUID of the build trigger')
class BuildTriggerActivate(RepositoryParamResource):
  """ Custom verb for activating a build trigger once all required information has been collected.
  """
  schemas = {
    'BuildTriggerActivateRequest': {
      'type': 'object',
      'required': [
        'config'
      ],
      'properties': {
        'config': {
          'type': 'object',
          'description': 'Arbitrary json.',
        },
        'pull_robot': {
          'type': 'string',
          'description': 'The name of the robot that will be used to pull images.'
        }
      }
    },
  }

  @require_repo_admin
  @nickname('activateBuildTrigger')
  @validate_json_request('BuildTriggerActivateRequest')
  def post(self, namespace, repository, trigger_uuid):
    """ Activate the specified build trigger. """
    try:
      trigger = model.build.get_build_trigger(trigger_uuid)
    except model.InvalidBuildTriggerException:
      raise NotFound()

    handler = BuildTriggerHandler.get_handler(trigger)
    if handler.is_active():
      raise InvalidRequest('Trigger config is not sufficient for activation.')

    user_permission = UserAdminPermission(trigger.connected_user.username)
    if user_permission.can():
      # Update the pull robot (if any).
      pull_robot_name = request.get_json().get('pull_robot', None)
      if pull_robot_name:
        try:
          pull_robot = model.user.lookup_robot(pull_robot_name)
        except model.InvalidRobotException:
          raise NotFound()

        # Make sure the user has administer permissions for the robot's namespace.
        (robot_namespace, shortname) = parse_robot_username(pull_robot_name)
        if not AdministerOrganizationPermission(robot_namespace).can():
          raise Unauthorized()

        # Make sure the namespace matches that of the trigger.
        if robot_namespace != namespace:
          raise Unauthorized()

        # Set the pull robot.
        trigger.pull_robot = pull_robot

      # Update the config.
      new_config_dict = request.get_json()['config']

      write_token_name = 'Build Trigger: %s' % trigger.service.name
      write_token = model.token.create_delegate_token(namespace, repository, write_token_name,
                                                      'write')

      try:
        path = url_for('webhooks.build_trigger_webhook', trigger_uuid=trigger.uuid)
        authed_url = _prepare_webhook_url(app.config['PREFERRED_URL_SCHEME'],
                                          '$token', write_token.code,
                                          app.config['SERVER_HOSTNAME'], path)

        handler = BuildTriggerHandler.get_handler(trigger, new_config_dict)
        final_config, private_config = handler.activate(authed_url)

        if 'private_key' in private_config:
          trigger.private_key = private_config['private_key']

      except TriggerActivationException as exc:
        write_token.delete_instance()
        raise request_error(message=exc.message)

      # Save the updated config.
      trigger.config = json.dumps(final_config)
      trigger.write_token = write_token
      trigger.save()

      # Log the trigger setup.
      repo = model.repository.get_repository(namespace, repository)
      log_action('setup_repo_trigger', namespace,
               {'repo': repository, 'namespace': namespace,
                'trigger_id': trigger.uuid, 'service': trigger.service.name,
                'pull_robot': trigger.pull_robot.username if trigger.pull_robot else None,
                'config': final_config}, repo=repo)

      return trigger_view(trigger, can_admin=True)
    else:
      raise Unauthorized()


@resource('/v1/repository/<apirepopath:repository>/trigger/<trigger_uuid>/analyze')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('trigger_uuid', 'The UUID of the build trigger')
@internal_only
class BuildTriggerAnalyze(RepositoryParamResource):
  """ Custom verb for analyzing the config for a build trigger and suggesting various changes
      (such as a robot account to use for pulling)
  """
  schemas = {
    'BuildTriggerAnalyzeRequest': {
      'type': 'object',
      'required': [
        'config'
      ],
      'properties': {
        'config': {
          'type': 'object',
          'description': 'Arbitrary json.',
        }
      }
    },
  }

  @require_repo_admin
  @nickname('analyzeBuildTrigger')
  @validate_json_request('BuildTriggerAnalyzeRequest')
  def post(self, namespace, repository, trigger_uuid):
    """ Analyze the specified build trigger configuration. """
    try:
      trigger = model.build.get_build_trigger(trigger_uuid)
    except model.InvalidBuildTriggerException:
      raise NotFound()

    new_config_dict = request.get_json()['config']
    handler = BuildTriggerHandler.get_handler(trigger, new_config_dict)

    try:
      # Load the contents of the Dockerfile.
      contents = handler.load_dockerfile_contents()
      if not contents:
        return {
          'status': 'error',
          'message': 'Could not read the Dockerfile for the trigger'
        }

      # Parse the contents of the Dockerfile.
      parsed = parse_dockerfile(contents)
      if not parsed:
        return {
          'status': 'error',
          'message': 'Could not parse the Dockerfile specified'
        }

      # Determine the base image (i.e. the FROM) for the Dockerfile.
      base_image = parsed.get_base_image()
      if not base_image:
        return {
          'status': 'warning',
          'message': 'No FROM line found in the Dockerfile'
        }

      # Check to see if the base image lives in Quay.
      quay_registry_prefix = '%s/' % (app.config['SERVER_HOSTNAME'])

      if not base_image.startswith(quay_registry_prefix):
        return {
          'status': 'publicbase'
        }

      # Lookup the repository in Quay.
      result = base_image[len(quay_registry_prefix):].split('/', 2)
      if len(result) != 2:
        return {
          'status': 'warning',
          'message': '"%s" is not a valid Quay repository path' % (base_image)
        }

      (base_namespace, base_repository) = result
      found_repository = model.repository.get_repository(base_namespace, base_repository)
      if not found_repository:
        return {
          'status': 'error',
          'message': 'Repository "%s" referenced by the Dockerfile was not found' % (base_image)
        }

      # If the repository is private and the user cannot see that repo, then
      # mark it as not found.
      can_read = ReadRepositoryPermission(base_namespace, base_repository)
      if found_repository.visibility.name != 'public' and not can_read:
        return {
          'status': 'error',
          'message': 'Repository "%s" referenced by the Dockerfile was not found' % (base_image)
        }

      # Check to see if the repository is public. If not, we suggest the
      # usage of a robot account to conduct the pull.
      read_robots = []

      if AdministerOrganizationPermission(base_namespace).can():
        def robot_view(robot):
          return {
            'name': robot.username,
            'kind': 'user',
            'is_robot': True
          }

        def is_valid_robot(user):
          # Make sure the user is a robot.
          if not user.robot:
            return False

          # Make sure the current user can see/administer the robot.
          (robot_namespace, shortname) = parse_robot_username(user.username)
          return AdministerOrganizationPermission(robot_namespace).can()

        repo_users = list(model.user.get_all_repo_users_transitive(base_namespace, base_repository))
        read_robots = [robot_view(user) for user in repo_users if is_valid_robot(user)]

      return {
        'namespace': base_namespace,
        'name': base_repository,
        'is_public': found_repository.visibility.name == 'public',
        'robots': read_robots,
        'status': 'analyzed'
      }

    except RepositoryReadException as rre:
      return {
        'status': 'error',
        'message': rre.message
      }
    except NotImplementedError:
      return {
        'status': 'notimplemented',
      }

    raise NotFound()


@resource('/v1/repository/<apirepopath:repository>/trigger/<trigger_uuid>/start')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('trigger_uuid', 'The UUID of the build trigger')
class ActivateBuildTrigger(RepositoryParamResource):
  """ Custom verb to manually activate a build trigger. """
  schemas = {
    'RunParameters': {
      'type': 'object',
      'description': 'Optional run parameters for activating the build trigger',
      'properties': {
        'branch_name': {
          'type': 'string',
          'description': '(SCM only) If specified, the name of the branch to build.'
        },
        'commit_sha': {
          'type': 'string',
          'description': '(Custom Only) If specified, the ref/SHA1 used to checkout a git repository.'
        },
        'refs': {
          'type': 'object',
          'description': '(SCM Only) If specified, the ref to build.'
        }
      },
      'additionalProperties': False
    }
  }

  @require_repo_admin
  @nickname('manuallyStartBuildTrigger')
  @validate_json_request('RunParameters')
  def post(self, namespace, repository, trigger_uuid):
    """ Manually start a build from the specified trigger. """
    try:
      trigger = model.build.get_build_trigger(trigger_uuid)
    except model.InvalidBuildTriggerException:
      raise NotFound()

    handler = BuildTriggerHandler.get_handler(trigger)
    if not handler.is_active():
      raise InvalidRequest('Trigger is not active.')

    try:
      repo = model.repository.get_repository(namespace, repository)
      pull_robot_name = model.build.get_pull_robot_name(trigger)

      run_parameters = request.get_json()
      prepared = handler.manual_start(run_parameters=run_parameters)
      build_request = start_build(repo, prepared, pull_robot_name=pull_robot_name)
    except TriggerStartException as tse:
      raise InvalidRequest(tse.message)

    resp = build_status_view(build_request)
    repo_string = '%s/%s' % (namespace, repository)
    headers = {
      'Location': api.url_for(RepositoryBuildStatus, repository=repo_string,
                              build_uuid=build_request.uuid),
    }
    return resp, 201, headers


@resource('/v1/repository/<apirepopath:repository>/trigger/<trigger_uuid>/builds')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('trigger_uuid', 'The UUID of the build trigger')
class TriggerBuildList(RepositoryParamResource):
  """ Resource to represent builds that were activated from the specified trigger. """
  @require_repo_admin
  @parse_args()
  @query_param('limit', 'The maximum number of builds to return', type=int, default=5)
  @nickname('listTriggerRecentBuilds')
  def get(self, namespace, repository, trigger_uuid, parsed_args):
    """ List the builds started by the specified trigger. """
    limit = parsed_args['limit']
    builds = model.build.list_trigger_builds(namespace, repository, trigger_uuid, limit)
    return {
      'builds': [build_status_view(bld) for bld in builds]
    }


FIELD_VALUE_LIMIT = 30

@resource('/v1/repository/<apirepopath:repository>/trigger/<trigger_uuid>/fields/<field_name>')
@internal_only
class BuildTriggerFieldValues(RepositoryParamResource):
  """ Custom verb to fetch a values list for a particular field name. """
  @require_repo_admin
  @nickname('listTriggerFieldValues')
  def post(self, namespace, repository, trigger_uuid, field_name):
    """ List the field values for a custom run field. """
    try:
      trigger = model.build.get_build_trigger(trigger_uuid)
    except model.InvalidBuildTriggerException:
      raise NotFound()

    config = request.get_json() or None
    user_permission = UserAdminPermission(trigger.connected_user.username)
    if user_permission.can():
      handler = BuildTriggerHandler.get_handler(trigger, config)
      values = handler.list_field_values(field_name, limit=FIELD_VALUE_LIMIT)

      if values is None:
        raise NotFound()

      return {
        'values': values
      }
    else:
      raise Unauthorized()


@resource('/v1/repository/<apirepopath:repository>/trigger/<trigger_uuid>/sources')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('trigger_uuid', 'The UUID of the build trigger')
@internal_only
class BuildTriggerSources(RepositoryParamResource):
  """ Custom verb to fetch the list of build sources for the trigger config. """
  @require_repo_admin
  @nickname('listTriggerBuildSources')
  def get(self, namespace, repository, trigger_uuid):
    """ List the build sources for the trigger configuration thus far. """
    try:
      trigger = model.build.get_build_trigger(trigger_uuid)
    except model.InvalidBuildTriggerException:
      raise NotFound()

    user_permission = UserAdminPermission(trigger.connected_user.username)
    if user_permission.can():
      handler = BuildTriggerHandler.get_handler(trigger)

      try:
        return {
          'sources': handler.list_build_sources()
        }
      except RepositoryReadException as rre:
        raise InvalidRequest(rre.message)
    else:
      raise Unauthorized()