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(state) //и запускаем подписчиков
        }
    }
    
    return {
        getState, //добавление функции getState в результирующий объект
        dispatch,
        subscribe //добавление subscribe в объект
    }
}





//JWT
const jwt = (token) =>{
    try {
    let payload = JSON.parse(atob(token.split(".")[1]))
    return payload
    }
    catch(error){
        return undefined
    }
}

const reducers = {
    promise: promiseReducer, //допилить много имен для многих промисов
    auth: localStoredReducer(authReducer,"auth"),    //часть предыдущего ДЗ
    cart: localStoredReducer(cartReducer,"cart"),  //часть предыдущего ДЗ
}

//promiseReducer
const totalReducer = combineReducers(reducers) 
function promiseReducer(state={}, {type,name, status, payload, error}){
    if (type === 'PROMISE'){
        //имена добавить
        return {
            ...state,
           [name] : {status, payload, error}
        }
    }
    return state
}

//CombineReducer
function combineReducers(reducers){
    function totalReducer(state={}, action){
        const newTotalState = {}
        for (const [reducerName, reducer] of Object.entries(reducers)){
            const newSubState = reducer(state[reducerName], action)
            if (newSubState !== state[reducerName]){
                newTotalState[reducerName] = newSubState
            }
        }
        if (Object.keys(newTotalState).length){
            return {...state, ...newTotalState}
        }
        return state
    }

    return totalReducer
}

function getGql (endpoint){
  


    return async function gql(query, variables={}) {
        let headers = {
            'Content-Type': 'application/json;charset=utf-8',
            'Accept': 'application/json',
           
        }
        if ("authToken" in localStorage) {
            headers.Authorization = "Bearer " + localStorage.authToken
        }
        let result = await fetch(endpoint, {
            
            method: 'POST',
            headers,
            body: JSON.stringify({
                query,
                variables
            })
        }).then(res => res.json())
        if (("errors" in result) && !("data" in result)) {
            throw new Error(JSON.stringify(result.errors))
        }
        result = Object.values(result.data)[0]


        return result

    }
}



gql = getGql('http://shop-roles.node.ed.asmer.org.ua/graphql/')

//authReducer
function authReducer (state={},{type,token}){
    if(type === "AUTH_LOGIN"){
        try{
            window.localStorage.setItem("authToken",token)
            return {
                token: token,
                payload : jwt(token)
            }
        }
        catch(e){
            console.log(e)
        }
    }

    if(type === "AUTH_LOGOUT"){
        window.localStorage.removeItem("authToken")
        return {}
    }
    return state
}


//cartReducer
function cartReducer (state={},{type,good,count=1}){
    if(type === 'CART_ADD'){
        return{
            ...state,
            [good._id]: {
                good,
                count : +count
            }
        }
    }

    if(type === "CART_SUB"){
        if(state[good._id].count-count <= 0){
            delete state[good._id]
        }
         else {
            return {
            ...state,
            [good._id] : {
                good,
                count: state[good._id].count - count,
                }
            }
        }
    }

    if(type === "CART_DEL"){
        delete state[good._id]
        return {
            ...state
        }
    }

    if(type==="CART_SET"){
        if(state[good._id].count <= 0){
            delete state[good.id]
        }
        else {
            return {
                ...state,
                [good._id] : {
                    good,
                    count
                }
            }
        }
    }

    if(type === "CART_CLEAR"){
        return {}
        
    }
    return state
}


//имена добавить
const actionPromise = (name,promise) =>
    async dispatch => { 
        dispatch(actionPending(name)) //сигнализируем redux, что промис начался
        try{
            const payload = await promise //ожидаем промиса
            dispatch(actionFulfilled(name,payload)) //сигнализируем redux, что промис успешно выполнен
            return payload //в месте запуска store.dispatch с этим thunk можно так же получить результат промиса
        }
        catch (error){
            dispatch(actionRejected(name,error)) //в случае ошибки - сигнализируем redux, что промис несложился
        }
    }


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

//ActionLogin
const actionAuthLogin  = token => ({type: 'AUTH_LOGIN', token})
const actionAuthLogout = ()    => ({type: 'AUTH_LOGOUT'})

//ActionCart
const actionCartAdd = (good, count=1) => ({type: 'CART_ADD', count, good})
const actionCartSub = (good, count=1) => ({type: 'CART_SUB', count, good})
const actionCartDel = (good) => ({type: 'CART_DEL', good})
const actionCartSet = (good, count=1) => ({type: 'CART_SET', count, good})
const actionCartClear = () => ({type: 'CART_CLEAR'})


//LocalStoredReducer
function localStoredReducer(originalReducer, localStorageKey){
    function wrapper(state, action){
        if(!state){
            try{
               return JSON.parse(localStorage[localStorageKey])
            }
            catch {}
        }
            let resp = originalReducer(state,action)
            localStorage[localStorageKey] = JSON.stringify(resp)
            return resp
        
    }
    
    return wrapper
}

const store = createStore(totalReducer)

store.subscribe(() => console.log(store.getState())) 
//const store = createStore(localStoredReducer(cartReducer, 'cart'))
//store = createStore(totalReducer) //не забудьте combineReducers если он у вас уже есть
//store.subscribe(() => console.log(store.getState()))

let queryFindRoots = `query findRoots($q:String)  {
    CategoryFind(query: $q){
        _id name parent{
            _id name
        }
        }
    }`
let variablesFindRoots = {
q:JSON.stringify([{parent:null}])
}

//gql(queryFindRoots , variablesFindRoots ).then(console.log)

const actionFindRoots = () => actionPromise("findRoots",gql(queryFindRoots, variablesFindRoots))

store.dispatch(actionFindRoots())

let queryCatFindOne = `query categoryFindOne ($q : String) {
    CategoryFindOne(query: $q){
      _id name parent{
            _id name
      } 
        goods{
        _id name  description price 
        images{
          url
        }
      }
      subCategories{
        _id name
      }
    }
  }
  `


const actionCatFindOne = (_id) => actionPromise("CatFindOne",gql(queryCatFindOne,{
    q:JSON.stringify([{ _id }])
} ))

let queryGoodFindOne = `query goodfindOne ($q : String) {
    GoodFindOne(query: $q){
      _id name price description
        images{
          url
        }
    }
  }`


const actionGoodFindOne = (_id) => actionPromise("GoodFindOne",gql(queryGoodFindOne, {
    q:JSON.stringify([{ _id }])
}))

//Запрос на регістрацію
let mutationRegistr = `mutation registration($login:String, $password: String) {
    UserUpsert(user : {login:$login, password: $password}){
      _id createdAt login
    }
  }`

const actionRegistr = (login,password) => actionPromise("Registr",gql( mutationRegistr, {"login" : login , "password" : password}))

//Зaпрос на користувача
let queryLogin = `query login($login:String,$password:String){
    login(login:$login,password:$password)
  }`

const actionLogin = (login,password) => actionPromise("Login",gql(queryLogin, {login,password}))

//Історія замовлень
let queryHistoryOrder = `query historyOrder($order : String){
    OrderFind(query: $order){
      _id createdAt total owner {
        _id
        createdAt
        login
        nick
      } orderGoods{
        _id count good {
          _id
          createdAt
          name
          description
          price
        } total
      }
       
    }
  }
`
const HistoryOrder = () => actionPromise("HistoryOrder",gql(queryHistoryOrder, {
    order:JSON.stringify([{}])
}
))


//Заказ
const newOrder = (orderGoods) =>
  actionPromise("NewOrder",gql(
      `mutation NewOrder($order: OrderInput) {
        OrderUpsert(order: $order) {
          _id
          orderGoods {
            _id
            price
            count
            total
            good {
              name
              _id
              price
              images {
                url
              }
            }
          }
        }
      }`,
      { order: { orderGoods } }
    )
  )



// Лічильник в корзині
store.subscribe (()=>{
    let counter = 0
    for(let {count} of Object.values(store.getState().cart)){
        counter += count
    }
    cartIcon.innerHTML = counter;
})

//Анон чи Логін
store.subscribe(()=>{
    loginName.innerHTML = store.getState().auth.payload?.sub?.login || "anon"
})
//Якщо вже отримав токен в минулий раз
store.subscribe(()=>{
    let result = store.getState().auth?.token

    if(typeof(result)==="string"){
        afterLoginization()
    }
})


//URL for img 
const url = 'http://shop-roles.node.ed.asmer.org.ua/'

store.subscribe(()=>{
    let {status,payload,error} = store.getState().promise?.findRoots
    
    if(status === "PENDING"){
        aside.innerHTML = ""
    }
    if(status === "FULFILLED"){   
        aside.innerHTML = ""
        for(let {_id,name} of payload){
            let div = document.createElement('div')
            div.innerHTML = `<a href='#/category/${_id}'>${name}</a>`
            div.classList.add('asideLink')
            document.getElementById('aside').append(div)
        }
    }
})

//Категорії

store.subscribe(()=>{
    let {status,payload,error} = store.getState().promise?.CatFindOne || {}
    const [,route, _id] = location.hash.split('/')

    if(route !== "category"){
        return
    }

    
    if(status === "PENDING"){
        mainCard.innerHTML = `<img src = 'https://i.pinimg.com/originals/71/3a/32/713a3272124cc57ba9e9fb7f59e9ab3b.gif'>`
    }
    if(status === "FULFILLED"){
        const {name,subCategories,goods} = payload
        mainCard.innerHTML = ""
        if(payload && route === "category"){ 
            mainCard.innerHTML += `<h1>${name} </h1>`

            if(payload.subCategories !== null){
                for(let {_id,name} of subCategories){
                mainCard.innerHTML += `<a href="#/category/${_id}>${name}</a>`
                console.log(name)
                }
            }
           
            for(const {_id,name,images} of goods){
                for (let img of images){
                    mainCard.innerHTML += `<img src ="${url + img.url}" style="width:10%;"> ` 
                   }
               mainCard.innerHTML += `<a href='#/good/${_id}'>${name}</a></br>`
               
            }
        }
    }
})



//Товар
store.subscribe(()=>{
    let {status,payload,error} = store.getState().promise?.GoodFindOne || {}
    const [,route, _id] = location.hash.split('/')
    if(route !== "good"){
        return
    }

    if(status === "PENDING"){
        mainCard.innerHTML = `<img src = 'https://i.pinimg.com/originals/71/3a/32/713a3272124cc57ba9e9fb7f59e9ab3b.gif'>`
    }
    if(status === "FULFILLED"){
        mainCard.innerHTML = ""
        if(payload && route === "good"){
            let {_id,name,description,images,price} = payload
            

            mainCard.innerHTML = ""
            let divMain = document.createElement('div')
            divMain.id = "divMain"
            

            divMain.innerHTML += `<h1>${name} </h1>`
            divMain.innerHTML += `<h3>${description}</h3>`

            for(let img of images){
                divMain.innerHTML +=`<img src ="${url + img.url}"> ` 
            }
            divMain.innerHTML += `<h3>${price} $</h3>`
            divMain.innerHTML +=`<button id="buy">Buy</button>`

            mainCard.append(divMain)  
          
            buy.addEventListener("click",function(){
                store.dispatch(actionCartAdd({_id, name, price: price,img:images}))
             })
        }
    }
})


//store = createStore(cartReducer);



//store.dispatch(actionCartAdd({ _id: 'пиво', price: 50 }))
//store.dispatch(actionCartAdd({ _id: 'чипсы', price: 75 }));
//store.dispatch(actionCartAdd({ _id: 'пиво', price: 50 }, 5));
//store.dispatch(actionCartSet({ _id: 'чипсы', price: 75 }, 2));
//store.dispatch(actionCartSub({ _id: 'пиво', price: 50 }, 4));




//Авторизація
document.getElementById("Autorization").onclick = () => location.href = `#/login`;
const actionFullLogin = (login, password) =>
    async (dispatch) => {
        const token = await dispatch(actionLogin(login, password))
        console.log(token)

        if(typeof(token) === "string"){
            dispatch(actionAuthLogin(token))
            mainCard.innerHTML = `Hello,${login}.`
            afterLoginization()
        }
        else {
            mainCard.innerHTML = `<h1>Bad attempt</h1>
            <button id="reloadAuth">Try again</button>`
            document.getElementById("reloadAuth").onclick = function(){
                location.reload()
            }
        }
        //проверьте что token - строка и отдайте его в actionAuthLogin
    }

//Регістрація
document.getElementById("Registration").onclick = () => location.href = `#/register`
const actionFullRegistr = (login, password) =>
    async (dispatch) => {
       let userRegistr =  await dispatch(actionRegistr(login,password)) 
       if(userRegistr){
            dispatch(actionFullLogin(login,password))
        }
        else {
            mainCard.innerHTML = `<h1>Bad attempt</h1>
            <button id="reloadReg">Try again</button>`
            document.getElementById("reloadReg").onclick = function(){
                location.reload()
            }
        }
        
        
      
    }

   
//При логінізації


function afterLoginization (){

    document.getElementById("Registration").hidden = true
    document.getElementById("Autorization").hidden = true
    document.getElementById("logOut").hidden = false
    document.getElementById("history").hidden = false

    logOut.onclick = ()=>{
        store.dispatch(actionAuthLogout())
        location.reload()
    }

    mainCard.innerHTML = `<h3>I hope you are doing great.Let's buy smth!!!</h3>`

}



//Історія
document.getElementById("history").onclick = ()=> {location.href = `#/history`}

store.subscribe(()=>{
   
    const [,route, _id] = location.hash.split('/')
    if(route !== "history"){
        return
    }
    let {status,payload,error} = store.getState().promise?.HistoryOrder || {}

    if(status === "PENDING"){
        mainCard.innerHTML = `<img src = 'https://i.pinimg.com/originals/71/3a/32/713a3272124cc57ba9e9fb7f59e9ab3b.gif'>`
    }
    if(status === "FULFILLED"){
        mainCard.innerHTML = ""
        if(payload && route === "history"){
            let i=1
            let j = 0
            // let arr = []
            // let [createdAt,total ] = payload
            //console.log(createdAt,total)
            for( let {_id,createdAt,total,orderGoods} of payload){
                let data = new Date(+createdAt).toString()
                let time = data.split(" ").slice(1,5).join(" ")
                
            //     arr.push(+createdAt)
            //     arr.sort((a,b)=>{
            //         return b - a
            //    })
               
                

               
                
                mainCard.innerHTML += `<div class = "history" style = "border: 1px solid purple">
                <h3>Order №${i} at ${time}</h3>
                <h3>Total: ${total}$</h3>
                </div>`

                i++
                
            }
            
            //console.log(arr)
        }
    }
})

//Створення заказу
const actionNewOrder = () =>
async (dispatch,getState) => {
    let {cart} = getState()
    const orderGoods = Object.entries(cart).map(([_id,{count}])=>({
        good : { _id},
        count,
    })) 
    console.log(orderGoods)

    let result = await dispatch(newOrder(orderGoods))
    if(result?._id){
        dispatch(actionCartClear())
    }
}

//Корзина

store.subscribe(()=>{
    document.getElementById("cartIcon").onclick = function inforOfCart(){
        location.href = `#/cart`

        mainCard.innerHTML = ``

        let storeCartInfo = store.getState().cart
        

        let h1 = document.createElement('h1')
        h1.innerText = 'Cart'
      
        let sum = 0

        for(let i=0;i<Object.keys(storeCartInfo).length;i++){
            let div = document.createElement('div')
            div.id = `${i}`
            div.className = "Cart"
            div.style = "border: 1px solid purple;"
            mainCard.append(div)

            let userOrder = document.getElementById(i)
            let nameOrder = Object.keys(storeCartInfo)[i]
            let name = storeCartInfo[nameOrder].good.name

            userOrder.innerHTML +=`<h3>${name}</h3>`
            for(const img of storeCartInfo[nameOrder].good.img){
                userOrder.innerHTML +=`<img src="${url + img.url}" alt="imageGood">`
            }
            userOrder.innerHTML +=`<h3>Cost: ${storeCartInfo[nameOrder].good.price}$</h3>`

            let buttonMinus = document.createElement("button")
            buttonMinus.innerText = "-" 
            userOrder.append(buttonMinus)

            let input = document.createElement('input')
            input.type = "number"
            input.value = store.getState().cart[nameOrder].count
            userOrder.append(input)

            let buttonPlus = document.createElement("button")
            buttonPlus.innerText = "+"

            userOrder.append(buttonPlus)

            let buttonDel = document.createElement('button')
            buttonDel.innerText = "Delete"
            userOrder.append(buttonDel)


           buttonMinus.onclick = function(){
            input.value--
            store.dispatch(actionCartSub({
                _id:nameOrder,name:name,price:storeCartInfo[nameOrder].good.price,
                img:storeCartInfo[nameOrder].good.img}))
            inforOfCart() 
           }
           buttonPlus.onclick = function(){
            input.value++
            store.dispatch(actionCartAdd(
                {_id:nameOrder,name:name,price:storeCartInfo[nameOrder].good.price,
                    img:storeCartInfo[nameOrder].good.img},
                    input.value))
            inforOfCart()
           }

            input.oninput = function(){
                store.dispatch(actionCartSet({_id:nameOrder,name:name,price:storeCartInfo[nameOrder].good.price},+input.value))
                inforOfCart()
            }
           
            buttonDel.onclick = function(){
                store.dispatch(actionCartDel({_id:nameOrder}))
                inforOfCart()
            }


            sum += storeCartInfo[nameOrder].good.price * storeCartInfo[nameOrder].count



        }

        let divResult = document.createElement("div")
            divResult.className = "cartResult"
            
            divResult.innerHTML += `Sum: ${sum} $`
            mainCard.prepend(h1,divResult)

            let btnCreatOrd = document.createElement("button")
            btnCreatOrd.id = "btnCreateOrd"
            btnCreatOrd.innerText = "Create Order"
            divResult.append(btnCreatOrd)

            btnCreatOrd.onclick = function (){
                store.dispatch(actionNewOrder())
                store.dispatch(actionCartClear())
                inforOfCart()
            }

            if(Object.entries(storeCartInfo).length === 0){
                mainCard.innerHTML += `<img src = "https://static.thenounproject.com/png/576143-200.png">`
                mainCard.innerHTML +=`<h3>The cart is clear</h3>`
    
                document.getElementById("btnCreateOrd").disabled = true
            }
        
    }
})


//LoginForm 

   





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

  const routes = {
      category() {
          store.dispatch(actionCatFindOne(_id))
          
      },
      good(){
         // тут был store.dispatch goodById
         store.dispatch(actionGoodFindOne(_id))
          console.log('good', _id)
      },
      login(){
          mainCard.innerHTML = `<form>
          <div class="auto">
          <h1>Autorization</h1>
          <input id="inputLogin" type="text" placeholder="login">
          </br>
          <input id="inputPassword" type="password" placeholder="password">
          </br>
          <button id="loginButton">Log in</button>
          </div>
          </form>`
       

          
        // let aut = new formLogPas(mainCard,true) 
            document.getElementById("loginButton").onclick = function() {
                store.dispatch(actionFullLogin(inputLogin.value, inputPassword.value))
            }
          //нарисовать форму логина, которая по нажатию кнопки Login делает store.dispatch(actionFullLogin(login, password))
      },
      register(){
        mainCard.innerHTML = `<form>
        <div class="registration">
            <h1>Registration</h1>
            <input id="loginReg" type="text" placeholder="login">
            </br>
            <input id="passwordReg" type="password" placeholder="password">
            </br>
            <button id="regButton">Log in</button>
            </div>
            </form>`
          //let reg =  new formLogPas(mainCard,true)

            document.getElementById("regButton").onclick =() => {
                store.dispatch(actionFullRegistr(loginReg.value, passwordReg.value))
             }
             
          //нарисовать форму регистрации, которая по нажатию кнопки Login делает store.dispatch(actionFullRegister(login, password))
  
        
        },
        history(){
            store.dispatch(HistoryOrder())
        },
        cart(){},
    }    
            
    if (route in routes){
        routes[route]()
    }
}

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


window.onhashchange()

//const token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOnsiaWQiOiI2M2QyODUyNGRhODExZTMzNWJmY2ZlNTYiLCJsb2dpbiI6InZhczI0MyIsImFjbCI6WyI2M2QyODUyNGRhODExZTMzNWJmY2ZlNTYiLCJ1c2VyIl19LCJpYXQiOjE2NzQ3NDExNDF9.dVileTOVOJF1o6CUKgASIlTW7vdqDNLM3tycKXTIQHA"