import logging
import stripe
import re

from flask import request, make_response, jsonify, abort
from flask.ext.login import login_required, current_user, logout_user
from flask.ext.principal import identity_changed, AnonymousIdentity
from functools import wraps
from collections import defaultdict

import storage

from data import model
from app import app
from util.email import send_confirmation_email, send_recovery_email
from util.names import parse_repository_name
from util.gravatar import compute_hash
from auth.permissions import (ReadRepositoryPermission,
                              ModifyRepositoryPermission,
                              AdministerRepositoryPermission)
from endpoints import registry
from endpoints.web import common_login
from util.cache import cache_control


store = storage.load()
logger = logging.getLogger(__name__)


def api_login_required(f):
  @wraps(f)
  def decorated_view(*args, **kwargs):
    if not current_user.is_authenticated():
      abort(401)
    return f(*args, **kwargs)
  return decorated_view


@app.errorhandler(model.DataModelException)
def handle_dme(ex):
  return make_response(ex.message, 400)


@app.route('/api/')
def welcome():
  return make_response('welcome', 200)


@app.route('/api/user/', methods=['GET'])
def get_logged_in_user():
  if current_user.is_anonymous():
    return jsonify({'anonymous': True})

  user = current_user.db_user()
  return jsonify({
    'verified': user.verified,
    'anonymous': False,
    'username': user.username,
    'email': user.email,
    'gravatar': compute_hash(user.email),
    'askForPassword': user.password_hash is None,
  })

@app.route('/api/user/', methods=['PUT'])
@api_login_required
def change_user_details():
  user = current_user.db_user()

  user_data = request.get_json();

  try:
    if user_data['password']:
      logger.debug('Changing password for user: %s', user.username)
      model.change_password(user, user_data['password'])
  except model.InvalidPasswordException, ex:
    error_resp = jsonify({
      'message': ex.message,
    })
    error_resp.status_code = 400
    return error_resp

  return jsonify({
    'verified': user.verified,
    'anonymous': False,
    'username': user.username,
    'email': user.email,
    'gravatar': compute_hash(user.email),
    'askForPassword': user.password_hash is None,
  })

@app.route('/api/user/', methods=['POST'])
def create_user_api():
  user_data = request.get_json()
  existing_user = model.get_user(user_data['username'])
  if existing_user:
    error_resp = jsonify({
      'message': 'The username already exists'
    })
    error_resp.status_code = 400
    return error_resp

  try:
    new_user = model.create_user(user_data['username'], user_data['password'],
                                 user_data['email'])
    code = model.create_confirm_email_code(new_user)
    send_confirmation_email(new_user.username, new_user.email, code.code)
    return make_response('Created', 201)
  except model.DataModelException as ex:
    error_resp = jsonify({
      'message': ex.message,
    })
    error_resp.status_code = 400
    return error_resp


@app.route('/api/signin', methods=['POST'])
def signin_api():
  signin_data = request.get_json()

  username = signin_data['username']
  password = signin_data['password']

  #TODO Allow email login
  needs_email_verification = False
  invalid_credentials = False

  verified = model.verify_user(username, password)
  if verified:
    if common_login(verified):
      return make_response('Success', 200)
    else:
      needs_email_verification = True

  else:
    invalid_credentials = True

  response = jsonify({
    'needsEmailVerification': needs_email_verification,
    'invalidCredentials': invalid_credentials,
  })
  response.status_code = 403
  return response


@app.route("/api/signout", methods=['POST'])
@api_login_required
def logout():
  logout_user()

  identity_changed.send(app, identity=AnonymousIdentity())

  return make_response('Success', 200)


@app.route("/api/recovery", methods=['POST'])
def send_recovery():
  email = request.get_json()['email']
  code = model.create_reset_password_email_code(email)
  send_recovery_email(email, code.code)
  return make_response('Created', 201)


@app.route('/api/users/<prefix>', methods=['GET'])
@api_login_required
def get_matching_users(prefix):
  users = model.get_matching_users(prefix)

  return jsonify({
    'users': [user.username for user in users]
  })


@app.route('/api/repository/', methods=['POST'])
@api_login_required
def create_repo_api():
  pass


@app.route('/api/find/repository', methods=['GET'])
def match_repos_api():
  prefix = request.args.get('query', '')

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

  username = None
  if current_user.is_authenticated():
    username = current_user.db_user().username

  matching = model.get_matching_repositories(prefix, username)
  response = {
    'repositories': [repo_view(repo) for repo in matching]
  }

  return jsonify(response)


@app.route('/api/repository/', methods=['GET'])
def list_repos_api():
  def repo_view(repo_obj):
    is_public = model.repository_is_public(repo_obj.namespace, repo_obj.name)

    return {
      'namespace': repo_obj.namespace,
      'name': repo_obj.name,
      'description': repo_obj.description,
      'is_public': is_public
    }

  limit = request.args.get('limit', None)
  include_public = request.args.get('public', 'true')
  include_private = request.args.get('private', 'true')
  sort = request.args.get('sort', 'false')

  try:
    limit = int(limit) if limit else None
  except:
    limit = None

  include_public = include_public == 'true'
  include_private = include_private == 'true'
  sort = sort == 'true'

  username = None
  if current_user.is_authenticated() and include_private:
    username = current_user.db_user().username

  repo_query = model.get_visible_repositories(username, limit=limit,
                                              include_public=include_public,
                                              sort=sort)
  repos = [repo_view(repo) for repo in repo_query]
  response = {
    'repositories': repos
  }

  return jsonify(response)


@app.route('/api/repository/<path:repository>', methods=['PUT'])
@api_login_required
@parse_repository_name
def update_repo_api(namespace, repository):
  permission = ModifyRepositoryPermission(namespace, repository)
  if permission.can():
    repo = model.get_repository(namespace, repository)
    if repo:
      values = request.get_json()
      repo.description = values['description']
      repo.save()
      return jsonify({
          'success': True
      })

  abort(404)


@app.route('/api/repository/<path:repository>/changevisibility',
           methods=['POST'])
@api_login_required
@parse_repository_name
def change_repo_visibility_api(namespace, repository):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    repo = model.get_repository(namespace, repository)
    if repo:
      values = request.get_json()
      model.set_repository_visibility(repo, values['visibility'])
      return jsonify({
          'success': True
      })

  abort(404)


@app.route('/api/repository/<path:repository>', methods=['DELETE'])
@api_login_required
@parse_repository_name
def delete_repository(namespace, repository):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    model.purge_repository(namespace, repository)
    registry.delete_repository_storage(namespace, repository)
    return make_response('Deleted', 204)

  abort(404)


def image_view(image):
  return {
    'id': image.docker_image_id,
    'created': image.created,
    'comment': image.comment,
    'ancestors': image.ancestors,
    'dbid': image.id,
  }


@app.route('/api/repository/<path:repository>', methods=['GET'])
@parse_repository_name
def get_repo_api(namespace, repository):
  logger.debug('Get repo: %s/%s' % (namespace, repository))

  def tag_view(tag):
    image = model.get_tag_image(namespace, repository, tag.name)
    if not image:
      return {}

    return {
      'name': tag.name,
      'image': image_view(image),
    }

  permission = ReadRepositoryPermission(namespace, repository)
  is_public = model.repository_is_public(namespace, repository)
  if permission.can() or is_public:
    repo = model.get_repository(namespace, repository)
    if repo:
      tags = model.list_repository_tags(namespace, repository)
      tag_dict = {tag.name: tag_view(tag) for tag in tags}
      can_write = ModifyRepositoryPermission(namespace, repository).can()
      can_admin = AdministerRepositoryPermission(namespace, repository).can()
      return jsonify({
        'namespace': namespace,
        'name': repository,
        'description': repo.description,
        'tags': tag_dict,
        'can_write': can_write,
        'can_admin': can_admin,
        'is_public': is_public
      })

    abort(404)  # Not fount
  abort(403)  # Permission denied


def role_view(repo_perm_obj):
  return {
    'role': repo_perm_obj.role.name
  }


@app.route('/api/repository/<path:repository>/image/', methods=['GET'])
@parse_repository_name
def list_repository_images(namespace, repository):
  permission = ReadRepositoryPermission(namespace, repository)
  if permission.can() or model.repository_is_public(namespace, repository):
    all_images = model.get_repository_images(namespace, repository)
    all_tags = model.list_repository_tags(namespace, repository)

    tags_by_image_id = defaultdict(list)
    for tag in all_tags:
      tags_by_image_id[tag.image.docker_image_id].append(tag.name)


    def add_tags(image_json):
      image_json['tags'] = tags_by_image_id[image_json['id']]
      return image_json


    return jsonify({
      'images': [add_tags(image_view(image)) for image in all_images]
    })

  abort(403)


@app.route('/api/repository/<path:repository>/image/<image_id>',
           methods=['GET'])
@parse_repository_name
def get_image(namespace, repository, image_id):
  permission = ReadRepositoryPermission(namespace, repository)
  if permission.can() or model.repository_is_public(namespace, repository):
    image = model.get_repo_image(namespace, repository, image_id)
    if not image:
      abort(404)

    return jsonify(image_view(image))
  abort(403)


@app.route('/api/repository/<path:repository>/image/<image_id>/changes',
           methods=['GET'])
@cache_control(max_age=60*60)  # Cache for one hour
@parse_repository_name
def get_image_changes(namespace, repository, image_id):
  permission = ReadRepositoryPermission(namespace, repository)
  if permission.can() or model.repository_is_public(namespace, repository):
    diffs_path = store.image_file_diffs_path(namespace, repository, image_id)

    try:
      response_json = store.get_content(diffs_path)
      return make_response(response_json)
    except IOError:
      abort(404)

  abort(403)


@app.route('/api/repository/<path:repository>/tag/<tag>/images',
           methods=['GET'])
@parse_repository_name
def list_tag_images(namespace, repository, tag):
  permission = ReadRepositoryPermission(namespace, repository)
  if permission.can() or model.repository_is_public(namespace, repository):
    tag_image = model.get_tag_image(namespace, repository, tag)
    parent_images = model.get_parent_images(tag_image)

    parents = list(parent_images)
    parents.reverse()
    all_images = [tag_image] + parents

    return jsonify({
      'images': [image_view(image) for image in all_images]
    })

  abort(403)  # Permission denied


@app.route('/api/repository/<path:repository>/permissions/', methods=['GET'])
@api_login_required
@parse_repository_name
def list_repo_permissions(namespace, repository):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    repo_perms = model.get_all_repo_users(namespace, repository)

    return jsonify({
      'permissions': {repo_perm.user.username: role_view(repo_perm)
                      for repo_perm in repo_perms}
    })

  abort(403)  # Permission denied


@app.route('/api/repository/<path:repository>/permissions/<username>',
           methods=['GET'])
@api_login_required
@parse_repository_name
def get_permissions(namespace, repository, username):
  logger.debug('Get repo: %s/%s permissions for user %s' %
               (namespace, repository, username))
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    perm = model.get_user_reponame_permission(username, namespace, repository)
    return jsonify(role_view(perm))

  abort(403)  # Permission denied


@app.route('/api/repository/<path:repository>/permissions/<username>',
           methods=['PUT', 'POST'])
@api_login_required
@parse_repository_name
def change_permissions(namespace, repository, username):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    new_permission = request.get_json()

    logger.debug('Setting permission to: %s for user %s' %
                 (new_permission['role'], username))

    try:
      perm = model.set_user_repo_permission(username, namespace, repository,
                                            new_permission['role'])
    except model.DataModelException:
      logger.warning('User tried to remove themselves as admin.')
      abort(409)

    resp = jsonify(role_view(perm))
    if request.method == 'POST':
      resp.status_code = 201
    return resp

  abort(403)  # Permission denied


@app.route('/api/repository/<path:repository>/permissions/<username>',
           methods=['DELETE'])
@api_login_required
@parse_repository_name
def delete_permissions(namespace, repository, username):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    try:
      model.delete_user_permission(username, namespace, repository)
    except model.DataModelException:
      logger.warning('User tried to remove themselves as admin.')
      abort(409)

    return make_response('Deleted', 204)

  abort(403)  # Permission denied


def token_view(token_obj):
  return {
    'friendlyName': token_obj.friendly_name,
    'code': token_obj.code,
    'role': token_obj.role.name,
  }


@app.route('/api/repository/<path:repository>/tokens/', methods=['GET'])
@api_login_required
@parse_repository_name
def list_repo_tokens(namespace, repository):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    tokens = model.get_repository_delegate_tokens(namespace, repository)

    return jsonify({
      'tokens': {token.code: token_view(token) for token in tokens}
    })

  abort(403)  # Permission denied


@app.route('/api/repository/<path:repository>/tokens/<code>', methods=['GET'])
@api_login_required
@parse_repository_name
def get_tokens(namespace, repository, code):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    perm = model.get_repo_delegate_token(namespace, repository, code)
    return jsonify(token_view(perm))

  abort(403)  # Permission denied


@app.route('/api/repository/<path:repository>/tokens/', methods=['POST'])
@api_login_required
@parse_repository_name
def create_token(namespace, repository):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    token_params = request.get_json()

    token = model.create_delegate_token(namespace, repository,
                                        token_params['friendlyName'])

    resp = jsonify(token_view(token))
    resp.status_code = 201
    return resp

  abort(403)  # Permission denied


@app.route('/api/repository/<path:repository>/tokens/<code>', methods=['PUT'])
@api_login_required
@parse_repository_name
def change_token(namespace, repository, code):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    new_permission = request.get_json()

    logger.debug('Setting permission to: %s for code %s' %
                 (new_permission['role'], code))

    token = model.set_repo_delegate_token_role(namespace, repository, code,
                                               new_permission['role'])

    resp = jsonify(token_view(token))
    return resp

  abort(403)  # Permission denied


@app.route('/api/repository/<path:repository>/tokens/<code>',
           methods=['DELETE'])
@api_login_required
@parse_repository_name
def delete_token(namespace, repository, code):
  permission = AdministerRepositoryPermission(namespace, repository)
  if permission.can():
    model.delete_delegate_token(namespace, repository, code)
    return make_response('Deleted', 204)

  abort(403)  # Permission denied


def subscription_view(stripe_subscription, used_repos):
  return {
    'currentPeriodStart': stripe_subscription.current_period_start,
    'currentPeriodEnd': stripe_subscription.current_period_end,
    'plan': stripe_subscription.plan.id,
    'usedPrivateRepos': used_repos,
  }


@app.route('/api/user/plan', methods=['PUT'])
@api_login_required
def subscribe():
  # Amount in cents
  amount = 500

  request_data = request.get_json()
  plan = request_data['plan']

  user = current_user.db_user()
  private_repos = model.get_private_repo_count(user.username)

  if not user.stripe_id:
    # Create the customer and plan simultaneously
    card = request_data['token']
    cus = stripe.Customer.create(email=user.email, plan=plan, card=card)
    user.stripe_id = cus.id
    user.save()

    resp = jsonify(subscription_view(cus.subscription, private_repos))
    resp.status_code = 201
    return resp

  else:
    # Change the plan
    cus = stripe.Customer.retrieve(user.stripe_id)

    if plan == 'free':
      cus.cancel_subscription()
      cus.save()

      response_json = {
        'plan': 'free',
        'usedPrivateRepos': private_repos,
      }

    else:
      cus.plan = plan

      # User may have been a previous customer who is resubscribing
      if 'token' in request_data:
        cus.card = request_data['token']

      cus.save()

      response_json = subscription_view(cus.subscription, private_repos)

    return jsonify(response_json)


@app.route('/api/user/plan', methods=['GET'])
@api_login_required
def get_subscription():
  user = current_user.db_user()
  private_repos = model.get_private_repo_count(user.username)

  if user.stripe_id:
    cus = stripe.Customer.retrieve(user.stripe_id)

    if cus.subscription:
      return jsonify(subscription_view(cus.subscription, private_repos))

  return jsonify({
    'plan': 'free',
    'usedPrivateRepos': private_repos,
  })