#!/usr/bin/env python3
# -*-coding:UTF-8 -*

'''
    Flask functions and routes for the rest api
'''

import os
import re
import sys
import uuid
import json
import redis
import datetime

import Import_helper
import Tags

from flask import Flask, render_template, jsonify, request, Blueprint, redirect, url_for, Response
from flask_login import login_required

from functools import wraps

# ============ VARIABLES ============
import Flask_config


app = Flask_config.app
cfg = Flask_config.cfg
baseUrl = Flask_config.baseUrl
r_cache = Flask_config.r_cache
r_serv_db = Flask_config.r_serv_db
r_serv_onion = Flask_config.r_serv_onion
r_serv_metadata = Flask_config.r_serv_metadata

restApi = Blueprint('restApi', __name__, template_folder='templates')

# ============ AUTH FUNCTIONS ============

def check_token_format(strg, search=re.compile(r'[^a-zA-Z0-9_-]').search):
    return not bool(search(strg))

def verify_token(token):
    if len(token) != 41:
        return False

    if not check_token_format(token):
        return False

    if r_serv_db.hexists('user:tokens', token):
        return True
    else:
        return False

def verify_user_role(role, token):
    user_id = r_serv_db.hget('user:tokens', token)
    if user_id:
        if is_in_role(user_id, role):
            return True
        else:
            return False
    else:
        return False

def is_in_role(user_id, role):
    if r_serv_db.sismember('user_role:{}'.format(role), user_id):
        return True
    else:
        return False

# ============ DECORATOR ============

def token_required(user_role):
    def actual_decorator(funct):
        @wraps(funct)
        def api_token(*args, **kwargs):
            data = authErrors(user_role)
            if data:
                return Response(json.dumps(data[0], indent=2, sort_keys=True), mimetype='application/json'), data[1]
            else:
                return funct(*args, **kwargs)
        return api_token
    return actual_decorator

def get_auth_from_header():
    token = request.headers.get('Authorization').replace(' ', '') # remove space
    return token

def authErrors(user_role):
    # Check auth
    if not request.headers.get('Authorization'):
        return ({'status': 'error', 'reason': 'Authentication needed'}, 401)
    token = get_auth_from_header()
    data = None
    # verify token format

    try:
        authenticated = False
        if verify_token(token):
            authenticated = True

            # check user role
            if not verify_user_role(user_role, token):
                data = ({'status': 'error', 'reason': 'Access Forbidden'}, 403)

        if not authenticated:
            data = ({'status': 'error', 'reason': 'Authentication failed'}, 401)
    except Exception as e:
        print(e)
        data = ({'status': 'error', 'reason': 'Malformed Authentication String'}, 400)
    if data:
        return data
    else:
        return None

# ============ API CORE =============



# ============ FUNCTIONS ============

def is_valid_uuid_v4(header_uuid):
    try:
        header_uuid=header_uuid.replace('-', '')
        uuid_test = uuid.UUID(hex=header_uuid, version=4)
        return uuid_test.hex == header_uuid
    except:
        return False

def one():
    return 1

# ============= ROUTES ==============

# @restApi.route("/api", methods=['GET'])
# @login_required
# def api():
#     return 'api doc'

@restApi.route("api/items", methods=['GET', 'POST'])
@token_required('admin')
def items():
    item = request.args.get('id')

    return Response(json.dumps({'test': 2}), mimetype='application/json')


# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# POST JSON FORMAT
#
# {
#   "type": "text",         (default value)
#   "tags": [],             (default value)
#   "default_tags": True,    (default value)
#   "galaxy" [],            (default value)
#   "text": "",             mandatory if type = text
# }
#
# response: {"uuid": "uuid"}
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
@restApi.route("api/import/item", methods=['POST'])
@token_required('admin')
def import_item():
    data = request.get_json()
    if not data:
        return Response(json.dumps({'status': 'error', 'reason': 'Malformed JSON'}, indent=2, sort_keys=True), mimetype='application/json'), 400

    # unpack json
    text_to_import = data.get('text', None)
    if not text_to_import:
        return Response(json.dumps({'status': 'error', 'reason': 'No text supplied'}, indent=2, sort_keys=True), mimetype='application/json'), 400

    tags = data.get('tags', [])
    if not type(tags) is list:
        tags = []
    galaxy = data.get('galaxy', [])
    if not type(galaxy) is list:
        galaxy = []

    if not Tags.is_valid_tags_taxonomies_galaxy(tags, galaxy):
        return Response(json.dumps({'status': 'error', 'reason': 'Tags or Galaxy not enabled'}, indent=2, sort_keys=True), mimetype='application/json'), 400

    default_tags = data.get('default_tags', True)
    if default_tags:
        tags.append('infoleak:submission="manual"')

    if sys.getsizeof(text_to_import) > 900000:
        return Response(json.dumps({'status': 'error', 'reason': 'Size exceeds default'}, indent=2, sort_keys=True), mimetype='application/json'), 400

    UUID = str(uuid.uuid4())
    Import_helper.create_import_queue(tags, galaxy, text_to_import, UUID)

    return Response(json.dumps({'uuid': UUID}, indent=2, sort_keys=True), mimetype='application/json')

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# GET
#
# {
#   "uuid": "uuid",      mandatory
# }
#
# response: {
#               "status": "in queue"/"in progress"/"imported",
#               "items": [all item id]
#           }
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
@restApi.route("api/import/item/<UUID>", methods=['GET'])
@token_required('admin')
def import_item_uuid(UUID):

    # Verify uuid
    if not is_valid_uuid_v4(UUID):
        return Response(json.dumps({'status': 'error', 'reason': 'Invalid uuid'}), mimetype='application/json'), 400

    data = Import_helper.check_import_status(UUID)
    if data:
        return Response(json.dumps(data[0]), mimetype='application/json'), data[1]

    return Response(json.dumps({'status': 'error', 'reason': 'Invalid response'}), mimetype='application/json'), 400

# ========= REGISTRATION =========
app.register_blueprint(restApi, url_prefix=baseUrl)