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

from flask import Flask, make_response, request

SECRET_KEY = "DebugTalk"

app = Flask(__name__)

""" storage all users' data
data structure:
    users_dict = {
        'uid1': {
            'name': 'name1',
            'password': 'pwd1'
        },
        'uid2': {
            'name': 'name2',
            'password': 'pwd2'
        }
    }
"""
users_dict = {}

""" storage all token data
data structure:
    token_dict = {
        'device_sn1': 'token1',
        'device_sn2': 'token1'
    }
"""
token_dict = {}


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, {})
    if user:
        result = {"success": True, "data": user}
        status_code = 200
    else:
        result = {"success": False, "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 = True
        status_code = 200
        users_dict[uid] = user
    else:
        success = False
        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 = True
        status_code = 200
    else:
        success = False
        status_code = 404

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