import logging

from flask import (abort, redirect, request, url_for, make_response, Response,
                   Blueprint, send_from_directory, jsonify)

from avatar_generator import Avatar
from flask.ext.login import current_user
from urlparse import urlparse
from health.healthcheck import HealthCheck

from data import model
from data.model.oauth import DatabaseAuthorizationProvider
from app import app, billing as stripe, build_logs, avatar
from auth.auth import require_session_login, process_oauth
from auth.permissions import AdministerOrganizationPermission, ReadRepositoryPermission
from util.invoice import renderInvoiceToPdf
from util.seo import render_snapshot
from util.cache import no_cache
from endpoints.common import common_login, render_page_template, route_show_if, param_required
from endpoints.csrf import csrf_protect, generate_csrf_token
from endpoints.registry import set_cache_headers
from util.names import parse_repository_name, parse_repository_name_and_tag
from util.useremails import send_email_changed
from auth import scopes

import features

logger = logging.getLogger(__name__)

web = Blueprint('web', __name__)

STATUS_TAGS = app.config['STATUS_TAGS']


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


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


@web.route('/snapshot', methods=['GET'])
@web.route('/snapshot/', methods=['GET'])
@web.route('/snapshot/<path:path>', methods=['GET'])
def snapshot(path = ''):
  parsed = urlparse(request.url)
  final_url = '%s://%s/%s' % (parsed.scheme, 'localhost', path)
  result = render_snapshot(final_url)
  if result:
    return result

  abort(404)


@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('/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('/security/')
@no_cache
def security():
  return index('')


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


@web.route('/health', methods=['GET'])
@no_cache
def health():
  client = app.config['HTTPCLIENT']

  db_healthy = model.check_health()
  buildlogs_healthy = build_logs.check_health()

  hostname_parts = app.config['SERVER_HOSTNAME'].split(':')
  port = ''
  if len(hostname_parts) == 2:
    port = ':' + hostname_parts[1]

  registry_url = '%s://localhost%s/v1/_internal_ping' % (app.config['PREFERRED_URL_SCHEME'], port)
  registry_healthy = client.get(registry_url, verify=False).status_code == 200

  check = HealthCheck.get_check(app.config['HEALTH_CHECKER'][0], app.config['HEALTH_CHECKER'][1])
  (data, is_healthy) = check.conduct_healthcheck(db_healthy, buildlogs_healthy, registry_healthy)

  response = jsonify(dict(data=data, is_healthy=is_healthy))
  response.status_code = 200 if is_healthy else 503
  return response


@web.route('/status', methods=['GET'])
@no_cache
def status():
  db_healthy = model.check_health()
  buildlogs_healthy = build_logs.check_health()

  response = jsonify({
    'db_healthy': db_healthy,
    'buildlogs_healthy': buildlogs_healthy,
    'is_testing': app.config['TESTING'],
  })
  response.status_code = 200 if db_healthy and buildlogs_healthy else 503

  return response


@app.route("/avatar/<avatar_hash>")
@set_cache_headers
def render_avatar(avatar_hash, headers):
  try:
    size = int(request.args.get('size', 16))
  except ValueError:
    size = 16

  generated = Avatar.generate(size, avatar_hash, "PNG")
  resp = make_response(generated, 200, {'Content-Type': 'image/png'})
  resp.headers.extend(headers)
  return resp


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


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


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


@web.route('/robots.txt', methods=['GET'])
@no_cache
def robots():
  return send_from_directory('static', 'robots.txt')


@web.route('/<path:repository>')
@no_cache
@process_oauth
@parse_repository_name_and_tag
def redirect_to_repository(namespace, reponame, tag):
  permission = ReadRepositoryPermission(namespace, reponame)
  is_public = model.repository_is_public(namespace, reponame)

  if permission.can() or is_public:
    repository_name = '/'.join([namespace, reponame])
    return redirect(url_for('web.repository', path=repository_name, tag=tag))

  abort(404)


@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.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.confirm_email_authorization_for_repo(code)
  except model.DataModelException as ex:
    return render_page_template('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('message.html', message=message)


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

  try:
    user, new_email, old_email = model.confirm_user_email(code)
  except model.DataModelException as ex:
    return render_page_template('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'])
def confirm_recovery():
  code = request.values['code']
  user = model.validate_reset_code(code)

  if user:
    common_login(user)
    return redirect(url_for('web.user'))
  else:
    abort(403)


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

  # Lookup the tags for the repository.
  tags = model.list_repository_tags(namespace, repository)
  is_empty = len(list(tags)) == 0
  build = model.get_recent_repository_build(namespace, repository)

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

  response = make_response(STATUS_TAGS[status_name])
  response.content_type = 'image/svg+xml'
  return response


class FlaskAuthorizationProvider(DatabaseAuthorizationProvider):
  def get_authorized_user(self):
    return current_user.db_user()

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


@web.route('/oauth/authorizeapp', methods=['POST'])
@csrf_protect
def authorize_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_token_response('token', client_id, redirect_uri, scope=scope)


@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 redirect_uri != 'display' and 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)
    oauth_app_view = {
      'name': oauth_app.name,
      'description': oauth_app.description,
      'url': oauth_app.application_uri,
      'avatar': avatar.compute_hash(oauth_app.avatar_email, name=oauth_app.name),
      'organization': {
        'name': oauth_app.organization.username,
        'avatar': avatar.compute_hash(oauth_app.organization.email,
                                      name=oauth_app.organization.username)
      }
    }

    # Show the authorization page.
    has_dangerous_scopes = any([check_scope['dangerous'] for check_scope in scope_info])
    return render_page_template('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')
@param_required('client_id')
@param_required('client_secret')
@param_required('redirect_uri')
@param_required('code')
@param_required('scope')
def exchange_code_for_token():
  grant_type = request.form.get('grant_type', None)
  client_id = request.form.get('client_id', None)
  client_secret = request.form.get('client_secret', None)
  redirect_uri = request.form.get('redirect_uri', None)
  code = request.form.get('code', None)
  scope = request.form.get('scope', None)

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