const backendURL = "http://shop-roles.node.ed.asmer.org.ua/graphql";
const backendURLNotGraphQL = "http://shop-roles.node.ed.asmer.org.ua";

function createStore(reducer) {
    let state = reducer(undefined, {}); //стартовая инициализация состояния, запуск редьюсера со state === undefined
    let cbs = []; //массив подписчиков

    const getState = () => state; //функция, возвращающая переменную из замыкания
    const subscribe = (cb) => (
        cbs.push(cb), //запоминаем подписчиков в массиве
        () => (cbs = cbs.filter((c) => c !== cb))
    ); //возвращаем функцию unsubscribe, которая удаляет подписчика из списка

    const dispatch = (action) => {
        if (typeof action === "function") {
            //если action - не объект, а функция
            return action(dispatch, getState); //запускаем эту функцию и даем ей dispatch и getState для работы
        }
        const newState = reducer(state, action); //пробуем запустить редьюсер
        if (newState !== state) {
            //проверяем, смог ли редьюсер обработать action
            state = newState; //если смог, то обновляем state
            for (let cb of cbs) cb(); //и запускаем подписчиков
        }
    };

    return {
        getState, //добавление функции getState в результирующий объект
        dispatch,
        subscribe, //добавление subscribe в объект
    };
}

function jwtDecode(token) {
    try {
        return JSON.parse(atob(token.split(".")[1]));
    } catch (e) {}
}

function authReducer(state = {}, { type, token }) {
    //{
    //  token, payload
    //}

    if (type === "AUTH_LOGIN") {
        //пытаемся токен раскодировать
        const payload = jwtDecode(token);
        if (payload) {
            return {
                token,
                payload, //payload - раскодированный токен;
            };
        }
    }
    if (type === "AUTH_LOGOUT") {
        return {};
    }
    return state;
}

const actionAuthLogin = (token) => (dispatch, getState) => {
    const oldState = getState();
    dispatch({ type: "AUTH_LOGIN", token });
    const newState = getState();
    if (oldState !== newState) localStorage.authToken = token;
};

const actionAuthLogout = () => (dispatch) => {
    dispatch({ type: "AUTH_LOGOUT" });
    localStorage.removeItem("authToken");
};

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

const actionPending = (name) => ({
    type: "PROMISE",
    status: "PENDING",
    name,
});
const actionFulfilled = (name, payload) => ({
    type: "PROMISE",
    status: "FULFILLED",
    name,
    payload,
});
const actionRejected = (name, error) => ({
    type: "PROMISE",
    status: "REJECTED",
    name,
    error,
});

const actionPromise = (name, promise) => async (dispatch) => {
    try {
        dispatch(actionPending(name));
        let payload = await promise;
        dispatch(actionFulfilled(name, payload));
        return payload;
    } catch (e) {
        dispatch(actionRejected(name, e));
    }
};

function cartReducer(state = {}, { type, count = 1, good }) {
    // type CART_ADD CART_REMOVE CART_CLEAR CART_DEC
    // {
    //  id1: {count: 1, good: {name, price, images, id}}
    // }
    if (type === "CART_ADD") {
        return {
            ...state,
            [good._id]: { count: count + (state[good._id]?.count || 0), good },
        };
    }
    if (type === "CART_CLEAR") {
        return {};
    }
    if (type === "CART_REMOVE") {
        //let newState = {...state}
        let { [good._id]: poh, ...newState } = state; //o4en strashnoe koldunstvo
        //delete newState[good._id]
        return newState;
    }

    return state;
}

const actionCartAdd = (good, count = 1) => ({ type: "CART_ADD", good, count });
const actionCartChange = (good, count = 1) => ({
    type: "CART_CHANGE",
    good,
    count,
}); ///oninput меняяем полностью
const actionCartDelete = (good) => ({ type: "CART_DELETE", good });
const actionCartClear = () => ({ type: "CART_CLEAR" });

function localStoreReducer(reducer, localStorageKey) {
    function localStoredReducer(state, action) {
        // Если state === undefined, то достать старый state из local storage
        if (state === undefined) {
            try {
                return JSON.parse(localStorage[localStorageKey]);
            } catch (e) {}
        }
        const newState = reducer(state, action);
        // Сохранить newState в local storage
        localStorage[localStorageKey] = JSON.stringify(newState);
        return newState;
    }
    return localStoredReducer;
}

const delay = (ms) => new Promise((ok) => setTimeout(() => ok(ms), ms));

function combineReducers(reducers) {
    //пачку редьюсеров как объект {auth: authReducer, promise: promiseReducer}
    function combinedReducer(combinedState = {}, action) {
        //combinedState - типа {auth: {...}, promise: {....}}
        const newCombinedState = {};
        for (const [reducerName, reducer] of Object.entries(reducers)) {
            const newSubState = reducer(combinedState[reducerName], action);
            if (newSubState !== combinedState[reducerName]) {
                newCombinedState[reducerName] = newSubState;
            }
        }
        if (Object.keys(newCombinedState).length === 0) {
            return combinedState;
        }
        return { ...combinedState, ...newCombinedState };
    }

    return combinedReducer; //нам возвращают один редьюсер, который имеет стейт вида {auth: {...стейт authReducer-а}, promise: {...стейт promiseReducer-а}}
}

const store = createStore(
    combineReducers({
        auth: authReducer,
        promise: promiseReducer,
        cart: localStoreReducer(cartReducer, "cart"),
    })
); //не забудьте combineReducers если он у вас уже есть
if (localStorage.authToken) {
    store.dispatch(actionAuthLogin(localStorage.authToken));
}
//const store = createStore(combineReducers({promise: promiseReducer, auth: authReducer, cart: cartReducer}))
store.subscribe(() => console.log(store.getState()));

//store.dispatch(actionPromise('delay1000', delay(1000)))
//store.dispatch(actionPromise('delay3000', delay(3000)))

//store.dispatch(actionPending('delay1000'))

//delay(1000).then(result => store.dispatch(actionFulfilled('delay1000', result)),
//error => store.dispatch(actionRejected('delay1000', error)))

//store.dispatch(actionPending('delay3000'))

//delay(3000).then(result => store.dispatch(actionFulfilled('delay3000', result)),
//error => store.dispatch(actionRejected('delay3000', error)))

const gql = (url, query, variables) =>
    fetch(url, {
        method: "POST",
        headers: {
            "Content-Type": "application/json",
            Accept: "application/json",
        },
        body: JSON.stringify({ query, variables }),
    }).then((res) => res.json());

// const getGQL = url =>
// (query, variables) => fetch(url, {
//     method: 'POST',
//     headers: {
//         "Content-Type": "application/json",
//         // 'Accept' : 'application/json',
//         ...(localStorage.authToken ? {"Authorization": "Bearer " + localStorage.authToken} : {})
//     },
//     body: JSON.stringify({query, variables})
// }).then(res => res.json())
//     .then(data => {
//         if (data.data){
//             return Object.values(data.data)[0]
//         }
//         else throw new Error(JSON.stringify(data.errors))
//     })

const actionRootCats = () =>
    actionPromise(
        "rootCats",
        gql(
            backendURL,
            `query {
CategoryFind(query: "[{\\"parent\\":null}]"){
_id name
}
}`
        )
    );

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

const actionLogin = (login, password) =>
    actionPromise(
        "actionLogin",
        gql(
            backendURL,
            `query log($login:String, $password:String){
                                  login(login:$login, password:$password)
                                }`,
            { login, password }
        )
    );

const actionGoodById = (_id) =>
    actionPromise(
        "GoodFineOne",
        gql(
            backendURL,
            `query goodByid($goodId: String) {
        GoodFindOne(query: $goodId) {
            _id
          name
          price
          description
          images {
            url
          }
        }
      }`,
            { goodId: JSON.stringify([{ _id }]) }
        )
    );

store.dispatch(actionRootCats());
// store.dispatch(actionLogin("illiaKozyr", "qwerty123456"));

const actionFullLogin = (login, password) => async (dispatch) => {
    let result = await dispatch(actionLogin(login, password));
    if (result.data.login) {
        dispatch(actionAuthLogin(result.data.login));
    }
};

const actionFullRegister = (login, password) => async (dispatch) => {
    let user = await dispatch(
        actionPromise(
            "register",
            gql(
                backendURL,
                `mutation register($login: String, $password: String) {
                UserUpsert(user: {login: $login, password: $password}) {
                   _id
                   login
                 }
               }`,
                { login: login, password: password }
            )
        )
    );
    if (user) {
        dispatch(actionFullLogin(login, password));
    }
};

const actionOrders = () =>
    actionPromise(
        "orders",
        gql(
            backendURL,
            `query findOrder($q: String) {
    OrderFind(query: $q) {
      _id
      total
      createdAt
      orderGoods {
        count
        good {
          name
          price
        }
      }
    }
  }`,
            { q: JSON.stringify([{}]) }
        )
    );

store.subscribe(() => {
    const rootCats =
        store.getState().promise.rootCats?.payload?.data.CategoryFind;
    if (rootCats) {
        aside.innerHTML = "";
        for (let { _id, name } of rootCats) {
            const a = document.createElement("a");
            a.href = `#/category/${_id}`;
            a.innerHTML = name;
            aside.append(a);
        }
    }
});

store.subscribe(() => {
    const catById =
        store.getState().promise.catById?.payload?.data.CategoryFindOne;
    const [, route] = location.hash.split("/");

    if (catById && route === "category") {
        const { name, goods, _id } = catById;
        categoryName.innerHTML = `<h1>${name}</h1>`;

        var element = document.getElementById("productBlock");
        while (element.firstChild) {
            element.removeChild(element.firstChild);
        }

        for (let { _id, name, price, images } of goods) {
            const description = document.createElement("div");
            const textBlock = document.createElement("div");
            const imgProduct = document.createElement("img");
            const a = document.createElement("p");
            const productPrice = document.createElement("p");
            const b = document.getElementById(productBlock);
            const linkCard = document.createElement("a");

            productBlock.append(linkCard);
            linkCard.href = `#/good/${_id}`;

            linkCard.append(description);
            description.setAttribute("class", "card");

            description.append(imgProduct);

            imgProduct.src = `http://shop-roles.node.ed.asmer.org.ua/${images[0].url}`;

            description.append(textBlock);

            // a.href = `#/good/${_id}`;
            a.innerHTML = name;
            textBlock.append(a);

            productPrice.innerHTML = "price: " + price;
            textBlock.append(productPrice);

            const addToCartButton = document.createElement("p");
            addToCartButton.innerText = "click to buy";
            addToCartButton.className = "addToCartButton";
            textBlock.append(addToCartButton);

            // var elem = document.getElementById("productBlock");
            // elem.parentNode.removeChild(elem);
        }
    }
});

const bPoputDeleteBlock = document.createElement("div");
const bPoput = document.createElement("div");
bPoput.className = "b-popup";
bPoput.id = "b-popup";
const bPoputContainer = document.createElement("div");
bPoputContainer.className = "b-popup-content";
bPoputContainer.id = "b-popup-content";
const buttonGoodDeleteBlock = document.createElement('div')
buttonGoodDeleteBlock.id = "buttonGoodDeleteBlock"

const buttonCloseCart = document.createElement("button");
buttonCloseCart.innerText = `×`;
buttonCloseCart.id = "buttonCloseCartId";
const buttonGoodDelete = document.createElement("button");
buttonGoodDelete.innerText = "delete";
buttonGoodDelete.id = "buttonDelete";

shoppingCart.onclick = () => {
    header.append(bPoput);
    bPoput.append(bPoputContainer);
};

bPoputContainer.append(buttonGoodDeleteBlock);
buttonGoodDeleteBlock.append(buttonGoodDelete)
bPoputContainer.append(buttonCloseCart);


const divToCardBlock = document.createElement("div");

store.subscribe(() => {
    toCartById = store.getState().cart;
    for (let value of Object.values(toCartById)) {
        
        const { count, good } = value;
        console.log(count, "its cartbyid")

        divToCardBlock.id = "divToCartBlock";
        const divToCart = document.createElement("div");
        const goodByIdImage = document.createElement("img");
        const goodByIdName = document.createElement("h2");
        const goodByIdCount = document.createElement("h2");
        const buttonPlus = document.createElement("button");
        const buttonMinus = document.createElement("button");
        buttonPlus.innerHTML = "+";
        buttonMinus.innerHTML = "-";
        buttonPlus.id = "buttonPlus";
        buttonMinus.id = "buttonMinus";

        divToCart.id = "divToCart";
        bPoputContainer.append(divToCardBlock);
        divToCardBlock.append(divToCart);
        divToCart.append(goodByIdImage);
        divToCart.append(goodByIdName);
        divToCart.append(goodByIdCount);
        divToCart.append(buttonPlus);
        divToCart.append(buttonMinus);

        goodByIdImage.src = `${backendURLNotGraphQL}/${value.good.images[0].url}`;
        goodByIdName.innerText = good.name;
        goodByIdCount.innerText = count;
    }

    buttonCloseCart.onclick = () => {
        var parent = document.getElementById("header");
        var child = document.getElementById("b-popup");
        parent.removeChild(child);
    };

    const payload = store.getState().auth.token;
    if (payload) {
        shoppingCart.style.display = "block";
    } else {
        shoppingCart.style.display = "none";
    }

    // bPoputContainer.append(buttonGoodDelete);
});

buttonGoodDelete.onclick = () => {
    store.dispatch(actionCartClear());
    let a = document.getElementById('divToCartBlock')
    a.innerHTML = "";
    let b = document.getElementById('shoppingCart')
    b.innerHTML = "Cart"
};

const buyButtom = document.createElement("button");
const productImg = document.createElement("img");
const productName = document.createElement("h1");
const productPrice = document.createElement("h2");
const textBlock = document.createElement("div");
const flexBlock = document.createElement("div");
const productDescription = document.createElement("p");

let number = 0;
store.subscribe(() => {
    const goodById =
        store.getState().promise.GoodFineOne?.payload?.data.GoodFindOne;
    const [, route, _id] = location.hash.split("/");

    if (goodById && route === "good") {
        var element = document.getElementById("productBlock");
        while (element.firstChild) {
            element.removeChild(element.firstChild);
        }
        const { name, price, description, images } = goodById;
       

        flexBlock.id = "flexBlock";

        productBlock.append(flexBlock);

        flexBlock.append(productImg);
        productImg.style.width = "500px";
        productImg.style.height = "500px";
        productImg.src = `http://shop-roles.node.ed.asmer.org.ua/${images[0].url}`;

        textBlock.id = "textBlock";
        flexBlock.append(textBlock);

        productName.innerHTML = name;
        textBlock.append(productName);

        productPrice.innerHTML = "price: " + price;
        textBlock.append(productPrice);

        productDescription.innerHTML = description;
        textBlock.append(productDescription);

        buyButtom.id = "buyButtom";
        buyButtom.innerHTML = "Buy";
        textBlock.append(buyButtom);
        buyButtom.onclick = () => {
            store.dispatch(actionCartAdd(goodById));
            let a = document.getElementById('shoppingCart')
            number += 1
            a.innerHTML = "Cart: " + number;
        };
    }
});

store.subscribe(() => {
    const catById =
        store.getState().promise.catById?.payload?.data.CategoryFindOne;
    const [, route, _id] = location.hash.split("/");

    if (catById && route === "good") {
        const { name, price, description, images } = catById;
        categoryName.innerHTML = `<h1>${name}</h1>`;

        // var element = document.getElementById("productBlock");
        // while (element.firstChild) {
        //     element.removeChild(element.firstChild);
        // }
    }
});

const h2text = document.createElement("h2");
h2text.id = "h2text";
qwer.append(h2text);
const logoutButton = document.createElement("button");
logoutButton.id = "logoutButton";
qwer.append(logoutButton);

store.subscribe(() => {
    const payload = store.getState().auth.token;
    if (payload) {
        buyButtom.style.display = "block";
        logoutButton.style.display = "block";
        logoutButton.innerHTML = "Logout";
        login.style.display = "none";
        reg.style.display = "none";

        h2text.style.display = "block";

        h2text.innerText = jwtDecode(payload).sub.login;
    } else {
        buyButtom.style.display = "none";
        h2text.style.display = "none";
        logoutButton.style.display = "none";
    }
});

const buttonLogin = document.createElement("button");
buttonLogin.id = "loginInputt";
buttonLogin.innerText = "Login";

const buttonReg = document.createElement("button");
buttonReg.id = "regInput";
buttonReg.innerText = "Registration";

function bPopupCreate(text) {
    const bPopup = document.createElement("div");
    const bPopupContent = document.createElement("div");
    bPopup.id = "b-popup";
    bPopup.className = "b-popup";
    bPopupContent.className = "b-popup-content b-poput-container-flex";
    header.append(bPopup);
    bPopup.append(bPopupContent);
    const buttonCloseCart = document.createElement("button");
    buttonCloseCart.innerText = `×`;
    buttonCloseCart.id = "buttonCloseCartId";
    bPopupContent.append(buttonCloseCart);

    const loginText = document.createElement("h2");
    const passwordText = document.createElement("h2");
    loginText.innerText = "Enter Login:";
    bPopupContent.append(loginText);
    const loginInput = document.createElement("input");
    loginInput.type = "text";
    bPopupContent.append(loginInput);
    loginInput.id = "loginInput";
    loginInput.value = "illiaKozyr";
    passwordText.innerText = "Enter Password:";
    bPopupContent.append(passwordText);
    const loginInputPassword = document.createElement("input");
    loginInputPassword.type = "password";
    bPopupContent.append(loginInputPassword);
    loginInputPassword.id = "passwordInput";
    loginInputPassword.value = "qwerty123456";
    bPopupContent.append(text);

    buttonCloseCart.onclick = () => {
        var parent = document.getElementById("header");
        var child = document.getElementById("b-popup");
        parent.removeChild(child);
    };
}

window.onhashchange = () => {
    const [, route, _id] = location.hash.split("/");

    const routes = {
        category() {
            store.dispatch(actionCatById(_id));
        },
        good() {
            store.dispatch(actionGoodById(_id));
        },
        dashboard() {
            store.dispatch(actionOrders());
            console.log("заказостраница");
        },
    };

    if (route in routes) {
        routes[route]();
    }
};

login.onclick = () => {
    bPopupCreate(buttonLogin);
    buttonLogin.onclick = () => {
        store.dispatch(actionFullLogin(loginInput.value, passwordInput.value));
        logoutButton.style.display = "block";

        var parent = document.getElementById("header");
        var child = document.getElementById("b-popup");
        parent.removeChild(child);
    };
};

reg.onclick = () => {
    bPopupCreate(buttonReg);
    buttonReg.onclick = () => {
        store.dispatch(
            actionFullRegister(loginInput.value, passwordInput.value)
        );
        var parent = document.getElementById("header");
        var child = document.getElementById("b-popup");
        parent.removeChild(child);
    };
};

// store.subscribe(() => {
//     dashboardUl.innerHTML = ''
//     const {orders} = store.getState().promise;
//     const [,route, _id] = location.hash.split('/');
//     if(orders?.payload && route === 'dashboard'){
//         for(let {createdAt, total, orderGoods} of orders.payload){
//             let date = new Date(+createdAt);
//             let li = document.createElement("li");
//             for(let {count, good} of orderGoods){
//                 let div = document.createElement("div");
//                 div.innerHTML = `<strong>${good.name}</strong>
//                                 <span>${count} &#10006; ${good.price}</span>
//                                 `
//                 li.append(div);
//             }
//             li.innerHTML += `<div>${total}</div>
//             <div>${date.getDate()}.${date.getMonth() + 1}.${date.getFullYear()}</div>
//             <hr>`
//             dashboardUl.append(li)
//         }
//     }

// })

logoutButton.onclick = () => {
    store.dispatch(actionAuthLogout());
    login.style.display = "block";
    reg.style.display = "block";
};