import logo from './logo.svg';
import './App.scss';
import thunk from 'redux-thunk';
import {createStore, combineReducers, applyMiddleware} from 'redux';
import {Provider, connect} from 'react-redux';
import {useEffect, useState} from 'react';
import {Router, Route, Link, Redirect, match} from 'react-router-dom';
import {createBrowserHistory} from 'history';


const actionPending = name => ({type: 'PROMISE', status: 'PENDING', name});
const actionResolved = (name, payload) => ({type: 'PROMISE', status: 'RESOLVED', name, payload});
const actionRejected = (name, error) => ({type: 'PROMISE', status: 'REJECTED', name, error});

const actionPromise = (name, promise) =>
    async dispatch => {
        dispatch(actionPending(name)); // 1. {delay1000: {status: 'PENDING'}}
        try {
            let payload = await promise;
            dispatch(actionResolved(name, payload));
            return payload;
        } catch (error) {
            dispatch(actionRejected(name, error));
        }
    };

const getGQL = url =>
    (query, variables = {}) =>
        fetch(url, {
            //метод
            method: 'POST',
            headers: {
                //заголовок content-type
                'Content-Type': 'application/json',
                ...(localStorage.authToken ? {'Authorization': 'Bearer ' + localStorage.authToken} :
                    {})
            },
            //body с ключами query и variables
            body: JSON.stringify({query, variables})
        })
            .then(res => res.json())
            .then(data => {
                if (data.errors && !data.data)
                    throw new Error(JSON.stringify(data.errors));
                return data.data[Object.keys(data.data)[0]];
            });

const backendURL = 'http://shop-roles.asmer.fs.a-level.com.ua';
const gql = getGQL(backendURL + '/graphql');

function jwtDecode(token) {
    try {
        let decoded = token.split('.');
        decoded = decoded[1];
        decoded = atob(decoded);
        decoded = JSON.parse(decoded);
        return decoded;

    } catch (e) {
        return;
    }
}


//скопировать
//3 редьюсера
//экшоны к ним
//
const actionRootCats = () =>
    actionPromise('rootCats', gql(`query {
        CategoryFind(query: "[{\\"parent\\":null}]"){
            _id name
        }
    }`));


const actionCartAdd = (good, count = 1) => ({type: 'CART_ADD', good, count});
const actionCartRemove = (good, count = 1) => ({type: 'CART_REMOVE', good, count});
const actionCartChange = (good, count = 1) => ({type: 'CART_CHANGE', good, count});
const actionCartClear = (good, count = 1) => ({type: 'CART_CLEAR', good, count});

function cartReducer(state = {}, {type, good = {}, count = 1}) {
    const {_id} = good;
    const types = {
        CART_ADD() {
            return {
                ...state,
                [_id]: {good, count: count + (state[_id]?.count || 0)}
            };
        },
        CART_REMOVE() {
            let newState = {...state};
            delete newState[_id];
            return {
                ...newState
            };
        },
        CART_CHANGE() {
            return {
                ...state,
                [_id]: {good, count}
            };
        },
        CART_CLEAR() {
            return {};
        },
    };

    if (type in types)
        return types[type]();


    return state;
}

function authReducer(state, {type, token}) {
    if (!state) {
        if (localStorage.authToken) {
            type = 'AUTH_LOGIN';
            token = localStorage.authToken;
        } else {
            return {};
        }
    }
    if (type === 'AUTH_LOGIN') {
        let auth = jwtDecode(token);
        if (auth) {
            localStorage.authToken = token;
            return {token, payload: auth};
        }
    }
    if (type === 'AUTH_LOGOUT') {
        localStorage.authToken = '';
        return {};
    }

    return state;
}

function promiseReducer(state = {}, {type, name, status, payload, error}) {
    if (type === 'PROMISE') {
        return {
            ...state,
            [name]: {status, payload, error}
        };
    }
    return state;
}

// Actions =============================
// Логин и логаут
const actionAuthLogin = (token) => ({type: 'AUTH_LOGIN', token});
const actionAuthLogout = () => ({type: 'AUTH_LOGOUT'});

const actionLogin = (login = 'tst', password = '123') =>
    actionPromise('login', gql(`query ($login:String, $password:String){ login(login:$login, password:$password)}`, {
        'login': login,
        'password': password
    }));

const actionFullLogin = (login = 'tst', password = '123') =>
    async dispatch => {
        let token = await dispatch(actionLogin(login, password));
        console.log(token);
        if (token) {
            dispatch(actionAuthLogin(token));
        }
    };

// Регистрация
const actionRegister = (login = 'tst', password = '123') =>
    actionPromise('login', gql(`mutation reg($login:String, $password:String) {
        UserUpsert(user:{login:$login, password:$password, nick:$login}){
          _id login
        }
      }`, {'login': login, 'password': password}));

const actionFullRegister = (login = 'tst', password = '123') =>
    async dispatch => {
        console.log(login, password);
        await dispatch(actionRegister(login, password));
        await dispatch(actionFullLogin(login, password));
    };

// Корневые категории

// Товары категории
const actionCatById = (_id) =>
    actionPromise('catById', gql(`query ($q: String){
        CategoryFindOne(query: $q){
            _id name goods {
                _id name price images {
                    url
                }
            } 
            subCategories {
                _id name
            }
        }
    }`, {q: JSON.stringify([{_id}])}));

const actionGoodById = (_id) =>
    actionPromise('goodById', gql(`query ($good:String) {
        GoodFindOne(query:$good) {
          _id name price images {
              url
          }
        }
      }`, {good: JSON.stringify([{_id}])}));


const store = createStore(combineReducers(
        {
            promise: promiseReducer,
            auth: authReducer,
            cart: cartReducer
        }),
    applyMiddleware(thunk));

store.subscribe(() => console.log(store.getState()));

store.dispatch(actionRootCats());

const Logo = () =>
    <Link to="/">
        <img src={logo} className="Logo" alt="logo"/>
    </Link>;

const Header = () =>
    <header className="header">
        <Logo/>
        <Login/>
        <CKoshik/>
    </header>;

const CategoryListItem = ({_id, name}) =>
    <li>
        <Link to={`/category/${_id}`}>{name}</Link>
    </li>;

const CategoryList = ({cats}) => {
    return (
        <ul>
            {cats.map((item) => <CategoryListItem key={item._id} {...item}/>)}
        </ul>
    );
};

const CCategoryList = connect(state => ({cats: state.promise.rootCats?.payload || []}))(CategoryList);

const PageGood = ({good: {name, price, images}, match: {params: {_id}}, getData}) => {
    const isFirstImgExists = images && images[0] && images[0].url;

    useEffect(() => {
        getData(_id);
    }, []);

    return (
        <div>
            <h2>{name}</h2>
            {isFirstImgExists && <img src={`${backendURL}/${images[0].url}`} alt={name}/>}
            <strong>{price} грн</strong>
        </div>
    );
};

const CPageGood = connect(state => ({
    good: state.promise.goodById?.payload ?? [],
}), {getData: actionGoodById})(PageGood);

const Aside = () =>
    <aside className="aside">
        <CCategoryList/>
    </aside>;

const GoodCard = ({good: {_id, name, price, images}, onAdd}) =>
    <li className="GoodCard">
        <h2>{name}</h2>
        {images && images[0] && images[0].url && <img src={`${backendURL}/${images[0].url}`}/>}
        <strong>{price} грн</strong>
        <button onClick={() => onAdd({_id, name, price, images})}>+</button>
        <Link to={`/good/${_id}`}>
            Подробнее
        </Link>
    </li>;


const Login = () =>
    <Link to="/login">
        <h2 className="login">Личный кабинет</h2>
    </Link>;

const CGoodCard = connect(null, {
    onAdd: actionCartAdd
})(GoodCard);

const Koshik = ({cart}) => {
    let goodsInCart = cart;
    let allGoodsInCart = 0;
    for (let key in goodsInCart) {
        allGoodsInCart += goodsInCart[key].count;
    }
    return (
        <h2 className="koshikCounter">
            <Link to="/cart">В корзине:{allGoodsInCart}
            </Link>
        </h2>

    );
};

const CKoshik = connect(({cart}) => ({cart}))(Koshik);


const Category = ({cat: {name, goods = []} = {}}) => {
    return (
        <div className="Category">
            <h1>{name}</h1>
            <ul className="ul">
                {(goods || []).map(good => <CGoodCard key={good._id} good={good}/>)}
            </ul>
        </div>
    );

};


const CCategory = connect(state => ({cat: state.promise.catById?.payload || {}}))(Category);

const Cart = ({cart, onCartChange, onCartRemove}) => {
    const error = typeof cart === 'undefined';
    return (
        <div className="Cart">
            <h1>Корзина</h1>
            <div className="containerForCart">
                <div className="wrapperForName">
                    {error === false &&
                    (cart.map((good) => {
                            return (
                                <div className="name" key={good.good.name}>{good.good.name}</div>
                            );
                        })
                    )
                    }
                </div>

                <div className="wrapperForCount">
                    {error === false &&
                    (cart.map((good) => {
                            return <input
                                className="count"
                                type="number"
                                defaultValue={good.count}
                                onChange={(e) => {
                                    onCartChange(good.good, +e.target.value);
                                }
                                }
                                key={good.good._id}
                            />;
                        })
                    )}
                </div>
                <div className="wrapperForName">
                    {error === false &&
                    (cart.map((good) => {
                            return (
                                <button key={good.good._id} onClick={() => onCartRemove(good.good, good.count)
                                }>
                                    Удалить {good.good.name}</button>);
                        })
                    )
                    }
                </div>
            </div>
        </div>
    );
};

const CCart = connect(
    state => ({cart: Object.values(state.cart) || []}),
    {
        onCartChange: actionCartChange,
        onCartRemove: actionCartRemove
    })(Cart);


const LoginForm = ({onCartLogin}) => {
    const [login, setLogin] = useState('');
    const [password, setPassword] = useState('');
    const isDisabled = login === '' || password === '';
    console.log(login, password, isDisabled);

    const onChange = (event) => {
        event.target.name === 'login' ? setLogin(event.target.value) : setPassword(event.target.value);
    };

    return (
        <div className="inputWrapper">
            <h2>Вход в личный кабинет</h2>
            <input
                className="inputLogin"
                name="login"
                style={{borderColor: isDisabled ? 'red' : ''}}
                placeholder="введите логин"
                type="text"
                onChange={onChange}
            />
            <input
                className="inputPsw"
                name="password"
                style={{borderColor: isDisabled ? 'red' : ''}}
                placeholder="введите пароль"
                type="password"
                onChange={onChange}
            />
            <button
                className="buttonLogin"
                disabled={isDisabled}
                onClick={
                    () => {
                        onCartLogin(login, password);
                    }}>Login
            </button>
            <h4>Вы еще не зарегистрированы?</h4>
            <Link to="/registration">Зарегистрироваться</Link>
        </div>
    );
};

const CLoginForm = connect(
    null,
    {
        onCartLogin: actionFullLogin
    })(LoginForm);

const RegisterForm = ({onCartRegister}) => {
    const [login, setLogin] = useState('');
    const [password, setPassword] = useState('');
    const isDisabled = login === '' || password === '';
    console.log(login, password, isDisabled);

    const onChange = (event) => {
        event.target.name === 'login' ? setLogin(event.target.value) : setPassword(event.target.value);
    };

    return (
        <div className="inputWrapper">
            <h2>Регистрация</h2>
            <input
                className="inputLogin"
                name="userName"
                style={{borderColor: isDisabled ? 'red' : ''}}
                placeholder="введите имя"
                type="text"
                onChange={onChange}
            />
            <input
                className="inputLogin"
                name="login"
                style={{borderColor: isDisabled ? 'red' : ''}}
                placeholder="*введите логин"
                type="text"
                onChange={onChange}
            />
            <input
                className="inputPsw"
                name="password"
                style={{borderColor: isDisabled ? 'red' : ''}}
                placeholder="*введите пароль"
                type="password"
                onChange={onChange}
            />
            <button
                className="buttonLogin"
                disabled={isDisabled}
                onClick={
                    () => {
                        onCartRegister(login, password);
                    }}>Login
            </button>
            <Link to="/login">Войти в личный кабинет</Link>
        </div>
    );
};

const CRegisterForm = connect(
    null,
    {
        onCartRegister: actionFullRegister
    })(RegisterForm);

const PageMain = () =>
    <h1>Главная страничка</h1>;

const PageCategory = ({match: {params: {_id}}, getData}) => {

    useEffect(() => {
        getData(_id);
    }, [_id]);

    return (
        <div>
            <CCategory/>
        </div>
    );
};

const CPageCategory = connect(null, {getData: actionCatById})(PageCategory);

const Main = () =>
    <main className="main">
        <Aside/>
        <Content>

            <Route path="/" component={PageMain} exact/>
            <Route path="/category/:_id" component={CPageCategory} exact/>
            <Route path="/cart" component={CCart} exact/>
            <Route path="/login" component={CLoginForm} exact/>
            <Route path="/registration" component={CRegisterForm} exact/>
            <Route path="/good/:_id" component={CPageGood} exact/>
            {/*<CCategory/>*/}
        </Content>
    </main>;

const Content = ({children}) =>
    <div className="Content">
        {children}
    </div>;

const Footer = () =>
    <footer className="Footer">
        <Logo/>
    </footer>;

const history = createBrowserHistory();

//import {Provider, connect} from 'react-redux';
function App() {
    return (
        <Router history={history}>
            <Provider store={store}>
                <div className="App">
                    <Header/>
                    <Main/>
                    <Footer/>
                </div>
            </Provider>
        </Router>
    );
}

export default App;