import json
import logging

from datetime import timedelta

from cachetools import lru_cache
from flask import (abort, redirect, request, url_for, make_response, Response, render_template,
                   Blueprint, jsonify, send_file)
from flask_login import current_user

import features

from app import (app, billing as stripe, build_logs, avatar, signer, log_archive, config_provider,
                 get_app_url, instance_keys)
from auth import scopes
from auth.auth_context import get_authenticated_user
from auth.permissions import (AdministerOrganizationPermission, ReadRepositoryPermission,
                              SuperUserPermission, AdministerRepositoryPermission,
                              ModifyRepositoryPermission, OrganizationMemberPermission)
from auth.process import require_session_login, process_oauth, has_basic_auth, process_auth_or_cookie
from buildtrigger.basehandler import BuildTriggerHandler
from buildtrigger.bitbuckethandler import BitbucketBuildTrigger
from buildtrigger.customhandler import CustomBuildTrigger
from buildtrigger.triggerutil import TriggerProviderException
from data import model
from data.database import db
from endpoints.api.discovery import swagger_route_data
from endpoints.common import (common_login, render_page_template, route_show_if, param_required,
                              parse_repository_name)
from endpoints.csrf import csrf_protect, generate_csrf_token, verify_csrf
from endpoints.decorators import anon_protect, anon_allowed
from health.healthcheck import get_healthchecker
from util.cache import no_cache
from util.headers import parse_basic_auth
from util.invoice import renderInvoiceToPdf
from util.systemlogs import build_logs_archive
from util.useremails import send_email_changed


@lru_cache(maxsize=1)
def _get_route_data():
  return swagger_route_data(include_internal=True, compact=True)


def render_page_template_with_routedata(name, *args, **kwargs):
  return render_page_template(name, _get_route_data(), *args, **kwargs)

# Capture the unverified SSL errors.
logger = logging.getLogger(__name__)
logging.captureWarnings(True)

web = Blueprint('web', __name__)

STATUS_TAGS = app.config['STATUS_TAGS']


@web.route('/', methods=['GET'], defaults={'path': ''})
@no_cache
def index(path, **kwargs):
  return render_page_template_with_routedata('index.html', **kwargs)


@web.route('/500', methods=['GET'])
def internal_error_display():
  return render_page_template_with_routedata('500.html')

@web.errorhandler(404)
@web.route('/404', methods=['GET'])
def not_found_error_display(e = None):
  resp = index('', error_code=404)
  resp.status_code = 404
  return resp

@web.route('/organization/<path:path>', methods=['GET'])
@no_cache
def org_view(path):
  return index('')


@web.route('/user/<path:path>', methods=['GET'])
@no_cache
def user_view(path):
  return index('')


@route_show_if(features.ACI_CONVERSION)
@web.route('/aci-signing-key')
@no_cache
@anon_protect
def aci_signing_key():
  if not signer.name:
    abort(404)

  return send_file(signer.open_public_key_file())

@web.route('/plans/')
@no_cache
@route_show_if(features.BILLING)
def plans():
  return index('')


@web.route('/guide/')
@no_cache
def guide():
  return index('')


@web.route('/tour/')
@web.route('/tour/<path:path>')
@no_cache
def tour(path = ''):
  return index('')


@web.route('/tutorial/')
@no_cache
def tutorial():
  return index('')


@web.route('/organizations/')
@web.route('/organizations/new/')
@no_cache
def organizations():
  return index('')


@web.route('/user/')
@no_cache
def user():
  return index('')


@web.route('/superuser/')
@no_cache
@route_show_if(features.SUPER_USERS)
def superuser():
  return index('')


@web.route('/setup/')
@no_cache
@route_show_if(features.SUPER_USERS)
def setup():
  return index('')


@web.route('/signin/')
@no_cache
def signin(redirect=None):
  return index('')


@web.route('/contact/')
@no_cache
def contact():
  return index('')


@web.route('/about/')
@no_cache
def about():
  return index('')


@web.route('/new/')
@no_cache
def new():
  return index('')


@web.route('/confirminvite')
@no_cache
def confirm_invite():
  code = request.values['code']
  return index('', code=code)


@web.route('/repository/', defaults={'path': ''})
@web.route('/repository/<path:path>', methods=['GET'])
@no_cache
def repository(path):
  return index('')

@web.route('/starred/')
@no_cache
def starred():
  return index('')


@web.route('/security/')
@no_cache
def security():
  return index('')


@web.route('/enterprise/')
@no_cache
@route_show_if(features.BILLING)
def enterprise():
  return index('')


@web.route('/__exp/<expname>')
@no_cache
def exp(expname):
  return index('')


@web.route('/v1')
@web.route('/v1/')
@no_cache
def v1():
  return index('')


@web.route('/tos', methods=['GET'])
@no_cache
def tos():
  return index('')


@web.route('/privacy', methods=['GET'])
@no_cache
def privacy():
  return index('')


# TODO(jschorr): Remove this mirrored endpoint once we migrate ELB.
@web.route('/health', methods=['GET'])
@web.route('/health/instance', methods=['GET'])
@no_cache
def instance_health():
  checker = get_healthchecker(app, config_provider, instance_keys)
  (data, status_code) = checker.check_instance()
  response = jsonify(dict(data=data, status_code=status_code))
  response.status_code = status_code
  return response


# TODO(jschorr): Remove this mirrored endpoint once we migrate pingdom.
@web.route('/status', methods=['GET'])
@web.route('/health/endtoend', methods=['GET'])
@no_cache
def endtoend_health():
  checker = get_healthchecker(app, config_provider, instance_keys)
  (data, status_code) = checker.check_endtoend()
  response = jsonify(dict(data=data, status_code=status_code))
  response.status_code = status_code
  return response


@web.route('/health/dbrevision', methods=['GET'])
@route_show_if(features.BILLING) # Since this is only used in production.
@no_cache
def dbrevision_health():
  # Find the revision from the database.
  result = db.execute_sql('select * from alembic_version limit 1').fetchone()
  db_revision = result[0]

  # Find the local revision from the file system.
  with open('ALEMBIC_HEAD', 'r') as f:
    local_revision = f.readline().split(' ')[0]

  data = {
    'db_revision': db_revision,
    'local_revision': local_revision,
  }

  status_code = 200 if db_revision == local_revision else 400

  response = jsonify(dict(data=data, status_code=status_code))
  response.status_code = status_code
  return response


@web.route('/disclaimer', methods=['GET'])
@no_cache
def disclaimer():
  return render_page_template_with_routedata('disclaimer.html')


@web.route('/robots.txt', methods=['GET'])
def robots():
  robots_txt = make_response(render_template('robots.txt', baseurl=get_app_url()))
  robots_txt.headers['Content-Type'] = 'text/plain'
  return robots_txt


@web.route('/sitemap.xml', methods=['GET'])
def sitemap():
  popular_repo_tuples = model.repository.list_popular_public_repos(50, timedelta(weeks=1))
  xml = make_response(render_template('sitemap.xml', public_repos=popular_repo_tuples,
                                      baseurl=get_app_url()))
  xml.headers['Content-Type'] = 'application/xml'
  return xml


@web.route('/buildlogs/<build_uuid>', methods=['GET'])
@route_show_if(features.BUILD_SUPPORT)
@require_session_login
def buildlogs(build_uuid):
  found_build = model.build.get_repository_build(build_uuid)
  if not found_build:
    abort(403)

  repo = found_build.repository
  if not ModifyRepositoryPermission(repo.namespace_user.username, repo.name).can():
    abort(403)

  # If the logs have been archived, just return a URL of the completed archive
  if found_build.logs_archived:
    return redirect(log_archive.get_file_url(found_build.uuid))

  _, logs = build_logs.get_log_entries(found_build.uuid, 0)
  response = jsonify({
    'logs': [log for log in logs]
  })

  response.headers["Content-Disposition"] = "attachment;filename=" + found_build.uuid + ".json"
  return response


@web.route('/receipt', methods=['GET'])
@route_show_if(features.BILLING)
@require_session_login
def receipt():
  if not current_user.is_authenticated:
    abort(401)
    return

  invoice_id = request.args.get('id')
  if invoice_id:
    invoice = stripe.Invoice.retrieve(invoice_id)
    if invoice:
      user_or_org = model.user.get_user_or_org_by_customer_id(invoice.customer)

      if user_or_org:
        if user_or_org.organization:
          admin_org = AdministerOrganizationPermission(user_or_org.username)
          if not admin_org.can():
            abort(404)
            return
        else:
          if not user_or_org.username == current_user.db_user().username:
            abort(404)
            return

      file_data = renderInvoiceToPdf(invoice, user_or_org)
      return Response(file_data,
                      mimetype="application/pdf",
                      headers={"Content-Disposition": "attachment;filename=receipt.pdf"})
  abort(404)


@web.route('/authrepoemail', methods=['GET'])
@route_show_if(features.MAILING)
def confirm_repo_email():
  code = request.values['code']
  record = None

  try:
    record = model.repository.confirm_email_authorization_for_repo(code)
  except model.DataModelException as ex:
    return render_page_template_with_routedata('confirmerror.html', error_message=ex.message)

  message = """
  Your E-mail address has been authorized to receive notifications for repository
  <a href="%s://%s/repository/%s/%s">%s/%s</a>.
  """ % (app.config['PREFERRED_URL_SCHEME'], app.config['SERVER_HOSTNAME'],
         record.repository.namespace_user.username, record.repository.name,
         record.repository.namespace_user.username, record.repository.name)

  return render_page_template_with_routedata('message.html', message=message)


@web.route('/confirm', methods=['GET'])
@route_show_if(features.MAILING)
@anon_allowed
def confirm_email():
  code = request.values['code']
  user = None
  new_email = None

  try:
    user, new_email, old_email = model.user.confirm_user_email(code)
  except model.DataModelException as ex:
    return render_page_template_with_routedata('confirmerror.html', error_message=ex.message)

  if new_email:
    send_email_changed(user.username, old_email, new_email)

  common_login(user)

  return redirect(url_for('web.user', tab='email') if new_email else url_for('web.index'))


@web.route('/recovery', methods=['GET'])
@route_show_if(features.MAILING)
@anon_allowed
def confirm_recovery():
  code = request.values['code']
  user = model.user.validate_reset_code(code)

  if user is not None:
    common_login(user)
    return redirect(url_for('web.user'))
  else:
    message = 'Invalid recovery code: This code is invalid or may have already been used.'
    return render_page_template_with_routedata('message.html', message=message)


@web.route('/repository/<repopath:repository>/status', methods=['GET'])
@parse_repository_name()
@anon_protect
def build_status_badge(namespace_name, repo_name):
  token = request.args.get('token', None)
  is_public = model.repository.repository_is_public(namespace_name, repo_name)
  if not is_public:
    repo = model.repository.get_repository(namespace_name, repo_name)
    if not repo or token != repo.badge_token:
      abort(404)

  # Lookup the tags for the repository.
  tags = model.tag.list_repository_tags(namespace_name, repo_name)
  is_empty = len(list(tags)) == 0
  recent_build = model.build.get_recent_repository_build(namespace_name, repo_name)

  if not is_empty and (not recent_build or recent_build.phase == 'complete'):
    status_name = 'ready'
  elif recent_build and recent_build.phase == 'error':
    status_name = 'failed'
  elif recent_build and recent_build.phase != 'complete':
    status_name = 'building'
  else:
    status_name = 'none'

  if request.headers.get('If-None-Match') == status_name:
    return Response(status=304)

  response = make_response(STATUS_TAGS[status_name])
  response.content_type = 'image/svg+xml'
  response.headers['Cache-Control'] = 'no-cache'
  response.headers['ETag'] = status_name
  return response


class FlaskAuthorizationProvider(model.oauth.DatabaseAuthorizationProvider):
  def get_authorized_user(self):
    return get_authenticated_user()

  def _make_response(self, body='', headers=None, status_code=200):
    return make_response(body, status_code, headers)


@web.route('/oauth/authorizeapp', methods=['POST'])
@process_auth_or_cookie
def authorize_application():
  # Check for an authenticated user.
  if not get_authenticated_user():
    abort(401)
    return

  # If direct OAuth is not enabled or the user is not directly authed, verify CSRF.
  client_id = request.form.get('client_id', None)
  whitelist = app.config.get('DIRECT_OAUTH_CLIENTID_WHITELIST', [])
  if client_id not in whitelist or not has_basic_auth(get_authenticated_user().username):
    verify_csrf()

  provider = FlaskAuthorizationProvider()
  redirect_uri = request.form.get('redirect_uri', None)
  scope = request.form.get('scope', None)

  # Add the access token.
  return provider.get_token_response('token', client_id, redirect_uri, scope=scope)


@web.route(app.config['LOCAL_OAUTH_HANDLER'], methods=['GET'])
def oauth_local_handler():
  if not current_user.is_authenticated:
    abort(401)
    return

  if not request.args.get('scope'):
    return render_page_template_with_routedata("message.html", message="Authorization canceled")
  else:
    return render_page_template_with_routedata("generatedtoken.html")


@web.route('/oauth/denyapp', methods=['POST'])
@csrf_protect
def deny_application():
  if not current_user.is_authenticated:
    abort(401)
    return

  provider = FlaskAuthorizationProvider()
  client_id = request.form.get('client_id', None)
  redirect_uri = request.form.get('redirect_uri', None)
  scope = request.form.get('scope', None)

  # Add the access token.
  return provider.get_auth_denied_response('token', client_id, redirect_uri, scope=scope)


@web.route('/oauth/authorize', methods=['GET'])
@no_cache
@param_required('client_id')
@param_required('redirect_uri')
@param_required('scope')
def request_authorization_code():
  provider = FlaskAuthorizationProvider()
  response_type = request.args.get('response_type', 'code')
  client_id = request.args.get('client_id', None)
  redirect_uri = request.args.get('redirect_uri', None)
  scope = request.args.get('scope', None)

  if (not current_user.is_authenticated or
      not provider.validate_has_scopes(client_id, current_user.db_user().username, scope)):
    if not provider.validate_redirect_uri(client_id, redirect_uri):
      current_app = provider.get_application_for_client_id(client_id)
      if not current_app:
        abort(404)

      return provider._make_redirect_error_response(current_app.redirect_uri,
                                                    'redirect_uri_mismatch')

    # Load the scope information.
    scope_info = scopes.get_scope_information(scope)
    if not scope_info:
      abort(404)
      return

    # Load the application information.
    oauth_app = provider.get_application_for_client_id(client_id)
    app_email = oauth_app.avatar_email or oauth_app.organization.email

    oauth_app_view = {
      'name': oauth_app.name,
      'description': oauth_app.description,
      'url': oauth_app.application_uri,
      'avatar': json.dumps(avatar.get_data(oauth_app.name, app_email, 'app')),
      'organization': {
        'name': oauth_app.organization.username,
        'avatar': json.dumps(avatar.get_data_for_org(oauth_app.organization))
      }
    }

    # Show the authorization page.
    has_dangerous_scopes = any([check_scope['dangerous'] for check_scope in scope_info])
    return render_page_template_with_routedata('oauthorize.html', scopes=scope_info,
                                               has_dangerous_scopes=has_dangerous_scopes,
                                               application=oauth_app_view,
                                               enumerate=enumerate, client_id=client_id,
                                               redirect_uri=redirect_uri, scope=scope,
                                               csrf_token_val=generate_csrf_token())

  if response_type == 'token':
    return provider.get_token_response(response_type, client_id, redirect_uri, scope=scope)
  else:
    return provider.get_authorization_code(response_type, client_id, redirect_uri, scope=scope)

@web.route('/oauth/access_token', methods=['POST'])
@no_cache
@param_required('grant_type', allow_body=True)
@param_required('client_id', allow_body=True)
@param_required('redirect_uri', allow_body=True)
@param_required('code', allow_body=True)
@param_required('scope', allow_body=True)
def exchange_code_for_token():
  grant_type = request.values.get('grant_type', None)
  client_id = request.values.get('client_id', None)
  client_secret = request.values.get('client_id', None)
  redirect_uri = request.values.get('redirect_uri', None)
  code = request.values.get('code', None)
  scope = request.values.get('scope', None)

  # Sometimes OAuth2 clients place the client id/secret in the Auth header.
  basic_header = parse_basic_auth(request.headers.get('Authorization'))
  if basic_header is not None:
    client_id = basic_header[0] or client_id
    client_secret = basic_header[1] or client_secret

  provider = FlaskAuthorizationProvider()
  return provider.get_token(grant_type, client_id, client_secret, redirect_uri, code, scope=scope)


@web.route('/systemlogsarchive', methods=['GET'])
@process_oauth
@route_show_if(features.SUPER_USERS)
@no_cache
def download_logs_archive():
  # Note: We cannot use the decorator here because this is a GET method. That being said, this
  # information is sensitive enough that we want the extra protection.
  verify_csrf()

  if SuperUserPermission().can():
    archive_data = build_logs_archive(app)
    return Response(archive_data,
                    mimetype="application/octet-stream",
                    headers={"Content-Disposition": "attachment;filename=erlogs.tar.gz"})

  abort(403)


@web.route('/bitbucket/setup/<repopath:repository>', methods=['GET'])
@require_session_login
@parse_repository_name()
@route_show_if(features.BITBUCKET_BUILD)
def attach_bitbucket_trigger(namespace_name, repo_name):
  permission = AdministerRepositoryPermission(namespace_name, repo_name)
  if permission.can():
    repo = model.repository.get_repository(namespace_name, repo_name)
    if not repo:
      msg = 'Invalid repository: %s/%s' % (namespace_name, repo_name)
      abort(404, message=msg)

    trigger = model.build.create_build_trigger(repo, BitbucketBuildTrigger.service_name(), None,
                                               current_user.db_user())

    try:
      oauth_info = BuildTriggerHandler.get_handler(trigger).get_oauth_url()
    except TriggerProviderException:
      trigger.delete_instance()
      logger.debug('Could not retrieve Bitbucket OAuth URL')
      abort(500)

    config = {
      'access_token': oauth_info['access_token']
    }

    access_token_secret = oauth_info['access_token_secret']
    model.build.update_build_trigger(trigger, config, auth_token=access_token_secret)

    return redirect(oauth_info['url'])

  abort(403)


@web.route('/customtrigger/setup/<repopath:repository>', methods=['GET'])
@require_session_login
@parse_repository_name()
def attach_custom_build_trigger(namespace_name, repo_name):
  permission = AdministerRepositoryPermission(namespace_name, repo_name)
  if permission.can():
    repo = model.repository.get_repository(namespace_name, repo_name)
    if not repo:
      msg = 'Invalid repository: %s/%s' % (namespace_name, repo_name)
      abort(404, message=msg)

    trigger = model.build.create_build_trigger(repo, CustomBuildTrigger.service_name(),
                                               None, current_user.db_user())

    repo_path = '%s/%s' % (namespace_name, repo_name)
    full_url = '%s%s%s' % (url_for('web.repository', path=repo_path), '?tab=builds&newtrigger=',
                           trigger.uuid)

    logger.debug('Redirecting to full url: %s', full_url)
    return redirect(full_url)

  abort(403)


@web.route('/<repopath:repository>')
@no_cache
@process_oauth
@parse_repository_name(include_tag=True)
@anon_protect
def redirect_to_repository(namespace_name, repo_name, tag_name):
  # Always return 200 for ac-discovery, to ensure that rkt and other ACI-compliant clients can
  # find the metadata they need. Permissions will be checked in the registry API.
  if request.args.get('ac-discovery', 0) == 1:
    return index('')

  # Redirect to the repository page if the user can see the repository.
  is_public = model.repository.repository_is_public(namespace_name, repo_name)
  permission = ReadRepositoryPermission(namespace_name, repo_name)
  repo_exists = bool(model.repository.get_repository(namespace_name, repo_name))

  if repo_exists and (permission.can() or is_public):
    repo_path = '/'.join([namespace_name, repo_name])
    return redirect(url_for('web.repository', path=repo_path, tab="tags", tag=tag_name))

  namespace_exists = bool(model.user.get_user_or_org(namespace_name))
  namespace_permission = OrganizationMemberPermission(namespace_name).can()
  if get_authenticated_user() and get_authenticated_user().username == namespace_name:
    namespace_permission = True

  # Otherwise, we display an error for the user. Which error we display depends on permissions:
  # > If the namespace doesn't exist, 404.
  # > If the user is a member of the namespace:
  #   - If the repository doesn't exist, 404
  #   - If the repository does exist (no access), 403
  # > If the user is not a member of the namespace: 403
  error_info = {
    'for_repo': True,
    'namespace_exists': namespace_exists,
    'namespace': namespace_name,
    'repo_name': repo_name,
  }

  if not namespace_exists or (namespace_permission and not repo_exists):
    resp = index('', error_code=404, error_info=json.dumps(error_info))
    resp.status_code = 404
    return resp
  else:
    resp = index('', error_code=403, error_info=json.dumps(error_info))
    resp.status_code = 403
    return resp


@web.route('/<namespace>')
@no_cache
@process_oauth
@anon_protect
def redirect_to_namespace(namespace):
  user_or_org = model.user.get_user_or_org(namespace)
  if not user_or_org:
    abort(404)

  if user_or_org.organization:
    return redirect(url_for('web.org_view', path=namespace))
  else:
    return redirect(url_for('web.user_view', path=namespace))