from endpoints.api import (ApiResource, parse_args, query_param, truthy_bool, nickname, resource,
                           require_scope, path_param)
from data import model
from auth.permissions import (OrganizationMemberPermission, ViewTeamPermission,
                              ReadRepositoryPermission, UserAdminPermission,
                              AdministerOrganizationPermission, ReadRepositoryPermission)
from auth.auth_context import get_authenticated_user
from auth import scopes
from app import avatar, get_app_url
from operator import itemgetter
from stringscore import liquidmetal
from util.names import parse_robot_username

import math

@resource('/v1/entities/<prefix>')
class EntitySearch(ApiResource):
  """ Resource for searching entities. """
  @path_param('prefix', 'The prefix of the entities being looked up')
  @parse_args
  @query_param('namespace', 'Namespace to use when querying for org entities.', type=str,
               default='')
  @query_param('includeTeams', 'Whether to include team names.', type=truthy_bool, default=False)
  @query_param('includeOrgs', 'Whether to include orgs names.', type=truthy_bool, default=False)
  @nickname('getMatchingEntities')
  def get(self, args, prefix):
    """ Get a list of entities that match the specified prefix. """
    teams = []
    org_data = []

    namespace_name = args['namespace']
    robot_namespace = None
    organization = None

    try:
      organization = model.get_organization(namespace_name)

      # namespace name was an org
      permission = OrganizationMemberPermission(namespace_name)
      if permission.can():
        robot_namespace = namespace_name

        if args['includeTeams']:
          teams = model.get_matching_teams(prefix, organization)

        if args['includeOrgs'] and AdministerOrganizationPermission(namespace_name) \
           and namespace_name.startswith(prefix):
          org_data = [{
            'name': namespace_name,
            'kind': 'org',
            'is_org_member': True,
            'avatar': avatar.get_data_for_org(organization),
          }]

    except model.InvalidOrganizationException:
      # namespace name was a user
      user = get_authenticated_user()
      if user and user.username == namespace_name:
        # Check if there is admin user permissions (login only)
        admin_permission = UserAdminPermission(user.username)
        if admin_permission.can():
          robot_namespace = namespace_name

    users = model.get_matching_users(prefix, robot_namespace, organization)

    def entity_team_view(team):
      result = {
        'name': team.name,
        'kind': 'team',
        'is_org_member': True,
        'avatar': avatar.get_data_for_team(team)
      }
      return result

    def user_view(user):
      user_json = {
        'name': user.username,
        'kind': 'user',
        'is_robot': user.robot,
        'avatar': avatar.get_data_for_user(user)
      }

      if organization is not None:
        user_json['is_org_member'] = user.robot or user.is_org_member

      return user_json

    team_data = [entity_team_view(team) for team in teams]
    user_data = [user_view(user) for user in users]

    return {
      'results': team_data + user_data + org_data
    }


  def team_view(orgname, team):
    view_permission = ViewTeamPermission(orgname, team.name)
    role = model.get_team_org_role(team).name
    return {
      'id': team.id,
      'name': team.name,
      'description': team.description,
      'can_view': view_permission.can(),
      'role': role
    }


@resource('/v1/find/repository')
class FindRepositories(ApiResource):
  """ Resource for finding repositories. """
  @parse_args
  @query_param('query', 'The prefix to use when querying for repositories.', type=str, default='')
  @require_scope(scopes.READ_REPO)
  @nickname('findRepos')
  def get(self, args):
    """ Get a list of repositories that match the specified prefix query. """
    prefix = args['query']

    def repo_view(repo):
      return {
        'namespace': repo.namespace_user.username,
        'name': repo.name,
        'description': repo.description
      }

    username = None
    user = get_authenticated_user()
    if user is not None:
      username = user.username

    matching = model.get_matching_repositories(prefix, username)
    return {
      'repositories': [repo_view(repo) for repo in matching
                       if (repo.visibility.name == 'public' or
                           ReadRepositoryPermission(repo.namespace_user.username, repo.name).can())]
    }



def search_entity_view(username, entity, get_short_name=None):
  kind = 'user'
  avatar_data = avatar.get_data_for_user(entity)
  href = '/user/' + entity.username

  if entity.organization:
    kind = 'organization'
    avatar_data = avatar.get_data_for_org(entity)
    href = '/organization/' + entity.username
  elif entity.robot:
    parts = parse_robot_username(entity.username)
    if parts[0] == username:
      href = '/user/' + username + '?tab=robots&showRobot=' + entity.username
    else:
      href = '/organization/' + parts[0] + '?tab=robots&showRobot=' + entity.username

    kind = 'robot'
    avatar_data = None

  data = {
    'kind': kind,
    'avatar': avatar_data,
    'name': entity.username,
    'score': 1,
    'href': href
  }

  if get_short_name:
    data['short_name'] = get_short_name(entity.username)

  return data


def conduct_team_search(username, query, encountered_teams, results):
  """ Finds the matching teams where the user is a member. """
  matching_teams = model.get_matching_user_teams(query, get_authenticated_user(), limit=5)
  for team in matching_teams:
    if team.id in encountered_teams:
      continue

    encountered_teams.add(team.id)

    results.append({
      'kind': 'team',
      'name': team.name,
      'organization': search_entity_view(username, team.organization),
      'avatar': avatar.get_data_for_team(team),
      'score': 2,
      'href': '/organization/' + team.organization.username + '/teams/' + team.name
    })


def conduct_admined_team_search(username, query, encountered_teams, results):
  """ Finds matching teams in orgs admined by the user. """
  matching_teams = model.get_matching_admined_teams(query, get_authenticated_user(), limit=5)
  for team in matching_teams:
    if team.id in encountered_teams:
      continue

    encountered_teams.add(team.id)

    results.append({
      'kind': 'team',
      'name': team.name,
      'organization': search_entity_view(username, team.organization),
      'avatar': avatar.get_data_for_team(team),
      'score': 2,
      'href': '/organization/' + team.organization.username + '/teams/' + team.name
    })


def conduct_repo_search(username, query, results):
  """ Finds matching repositories. """
  def can_read(repository):
    if repository.is_public:
      return True

    return ReadRepositoryPermission(repository.namespace_user.username, repository.name).can()

  only_public = username is None
  matching_repos = model.get_sorted_matching_repositories(query, only_public, can_read, limit=5)

  for repo in matching_repos:
    repo_score = math.log(repo.count or 1, 10) or 1

    # If the repository is under the user's namespace, give it 20% more weight.
    namespace = repo.namespace_user.username
    if OrganizationMemberPermission(namespace).can() or namespace == username:
      repo_score = repo_score * 1.2

    results.append({
      'kind': 'repository',
      'namespace': search_entity_view(username, repo.namespace_user),
      'name': repo.name,
      'description': repo.description,
      'is_public': repo.is_public,
      'score': repo_score,
      'href': '/repository/' + repo.namespace_user.username + '/' + repo.name
    })


def conduct_namespace_search(username, query, results):
  """ Finds matching users and organizations. """
  matching_entities = model.get_matching_user_namespaces(query, username, limit=5)
  for entity in matching_entities:
    results.append(search_entity_view(username, entity))


def conduct_robot_search(username, query, results):
  """ Finds matching robot accounts. """
  def get_short_name(name):
    return parse_robot_username(name)[1]

  matching_robots = model.get_matching_robots(query, username, limit=5)
  for robot in matching_robots:
    results.append(search_entity_view(username, robot, get_short_name))


@resource('/v1/find/all')
class ConductSearch(ApiResource):
  """ Resource for finding users, repositories, teams, etc. """
  @parse_args
  @query_param('query', 'The search query.', type=str, default='')
  @require_scope(scopes.READ_REPO)
  @nickname('conductSearch')
  def get(self, args):
    """ Get a list of entities and resources that match the specified query. """
    query = args['query']
    if not query:
      return {'results': []}

    username = None
    results = []

    if get_authenticated_user():
      username = get_authenticated_user().username

      # Search for teams.
      encountered_teams = set()
      conduct_team_search(username, query, encountered_teams, results)
      conduct_admined_team_search(username, query, encountered_teams, results)

      # Search for robot accounts.
      conduct_robot_search(username, query, results)

    # Search for repos.
    conduct_repo_search(username, query, results)

    # Search for users and orgs.
    conduct_namespace_search(username, query, results)

    # Modify the results' scores via how close the query term is to each result's name.
    for result in results:
      name = result.get('short_name', result['name'])
      lm_score = liquidmetal.score(name, query) or 0.5
      result['score'] = result['score'] * lm_score

    return {'results': sorted(results, key=itemgetter('score'), reverse=True)}