import hashlib
import hmac
import json
import random
import string
from functools import wraps

from flask import Flask, make_response, request
from faker import Faker

SECRET_KEY = "mikezhou"

app = Flask(__name__)

users_dict = {}
token_dict = {}
fake = Faker(locale='zh_CN')

def gen_random_string(str_len):
    """ generate random string with specified length
    """
    return ''.join(
        random.choice(string.ascii_letters + string.digits) for _ in range(str_len))

def get_sign(*args):
    content = ''.join(args).encode('ascii')
    sign_key = SECRET_KEY.encode('ascii')
    sign = hmac.new(sign_key, content, hashlib.sha1).hexdigest()
    return sign

def gen_md5(*args):
    return hashlib.md5("".join(args).encode('utf-8')).hexdigest()


def validate_request(func):

    @wraps(func)
    def wrapper(*args, **kwargs):
        device_sn = request.headers.get('device_sn', "")
        token = request.headers.get('token', "")

        if not device_sn or not token:
            result = {
                'success': False,
                'msg': "device_sn or token is null."
            }
            response = make_response(json.dumps(result), 401)
            response.headers["Content-Type"] = "application/json"
            return response

        if token_dict.get(device_sn) != token:
            result = {
                'success': False,
                'msg': "Authorization failed!"
            }
            response = make_response(json.dumps(result), 403)
            response.headers["Content-Type"] = "application/json"
            return response

        return func(*args, **kwargs)

    return wrapper


@app.route('/')
def index():
    return "Hello World!"

@app.route('/api/get-token', methods=['POST'])
def get_token():
    device_sn = request.headers.get('device_sn', "")
    os_platform = request.headers.get('os_platform', "")
    app_version = request.headers.get('app_version', "")
    data = request.get_json()
    sign = data.get('sign', "")

    expected_sign = get_sign(device_sn, os_platform, app_version)

    if expected_sign != sign:
        result = {
            'success': False,
            'msg': "Authorization failed!"
        }
        response = make_response(json.dumps(result), 403)
    else:
        token = gen_random_string(16)
        token_dict[device_sn] = token

        result = {
            'success': True,
            'token': token
        }
        response = make_response(json.dumps(result))

    response.headers["Content-Type"] = "application/json"
    return response

@app.route('/api/users')
@validate_request
def get_users():
    users_list = [user for uid, user in users_dict.items()]
    users = {
        'success': True,
        'count': len(users_list),
        'items': users_list
    }
    response = make_response(json.dumps(users))
    response.headers["Content-Type"] = "application/json"
    return response

@app.route('/api/reset-all')
@validate_request
def clear_users():
    users_dict.clear()
    result = {
        'success': True
    }
    response = make_response(json.dumps(result))
    response.headers["Content-Type"] = "application/json"
    return response

@app.route('/api/users/<int:uid>', methods=['POST'])
@validate_request
def create_user(uid):
    user = request.get_json()
    if uid not in users_dict:
        result = {
            'success': True,
            'msg': "user created successfully."
        }
        status_code = 201
        users_dict[uid] = user
    else:
        result = {
            'success': False,
            'msg': "user already existed."
        }
        status_code = 500

    response = make_response(json.dumps(result), status_code)
    response.headers["Content-Type"] = "application/json"
    return response

@app.route('/api/users/<int:uid>')
@validate_request
def get_user(uid):
    user = users_dict.get(uid, {})
    info={
            'address': fake.address(),
            'name': fake.name(),
            'ssn': fake.ssn(),
            'company': fake.company(),
            'phone': fake.phone_number(),
            'imageurl': fake.image_url(),
            'url': fake.url(),
    }
    if user:
        result = {
            'success': 'get user success',
            'data': user,
            'info':info,
        }
        status_code = 200
    else:
        result = {
            'success': 'get user failed',
            'data': user
        }
        status_code = 404

    response = make_response(json.dumps(result), status_code)
    response.headers["Content-Type"] = "application/json"
    return response

@app.route('/api/users/<int:uid>', methods=['PUT'])
@validate_request
def update_user(uid):
    user = users_dict.get(uid, {})
    if user:
        user = request.get_json()
        success = 'update success'
        status_code = 200
        users_dict[uid] = user
    else:
        success = 'update failed'
        status_code = 404

    result = {
        'success': success,
        'data': user
    }
    response = make_response(json.dumps(result), status_code)
    response.headers["Content-Type"] = "application/json"
    return response

@app.route('/api/users/<int:uid>', methods=['DELETE'])
@validate_request
def delete_user(uid):
    user = users_dict.pop(uid, {})
    if user:
        success = 'delete success'
        status_code = 200
    else:
        success = 'delete failed'
        status_code = 404

    result = {
        'success': success,
        'data': user
    }
    response = make_response(json.dumps(result), status_code)
    response.headers["Content-Type"] = "application/json"
    return response

if __name__ == '__main__':
    app.run()