import React, {useState} from 'react';
import {Header} from "./components/Header";
import {LoginForm} from "./components/LoginForm";
import {Main} from "./components/Main";
import {Input} from "./components/Input";
import CategoryMenu from "./components/CategoryMenu";
import Category from "./components/Category";
import Footer from "./components/Footer";

import thunk from "redux-thunk";
import { createStore, combineReducers, applyMiddleware } from "redux";
import { Provider, connect } from "react-redux";
import {mapStateToPropsFactory} from "react-redux/es/connect/mapStateToProps";
import Spoiler from "./components/Spoiler";
import RangeInput from "./components/RangeInput";
import PasswordConfirm from "./components/PasswordConfirm";

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

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

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



function cartReducer (state={}, {type, good={}, count=1}) {

    if (Object.keys(state).length === 0 && localStorage.cart) {
        let currCart = JSON.parse(localStorage.cart)
        if (currCart && Object.keys(currCart).length !== 0) {
            state = currCart
        }
    }

    const {_id} = good

    const types = {
        CART_ADD() {
            count = +count
            if (!count) {
                return state
            }
            let newState = {
                ...state,
                [_id]: {good, count: (count + (state[_id]?.count || 0)) < 1 ? 1 : count + (state[_id]?.count || 0)}
            }
            localStorage.cart = JSON.stringify(newState)
            return newState
        },
        CART_CHANGE() {
            count = +count
            if (!count) {
                return state
            }
            let newState = {
                ...state,
                [_id]: {good, count: count < 0 ? 0 : count}
            }
            localStorage.cart = JSON.stringify(newState)
            return newState
        },
        CART_REMOVE() {
            let { [_id]: removed, ...newState }  = state
            localStorage.cart = JSON.stringify(newState)
            return newState
        },
        CART_CLEAR() {
            localStorage.cart = JSON.stringify({})
            return {}
        },
    }
    if (type in types) {
        return types[type]()
    }
    return state
}

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


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

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))
        try {
            let data = await promise
            dispatch(actionResolved(name, data))
            return data
        }
        catch(error){
            dispatch(actionRejected(name, error))
        }
    }
)

const getGQL = url => (
    async (query, variables={}) => {
        let obj = await fetch(url, {
            method: 'POST',
            headers: {
                "Content-Type": "application/json",
                ...(localStorage.authToken ? {Authorization: "Bearer " + localStorage.authToken} : {})
            },
            body: JSON.stringify({ query, variables })
        })
        let a = await obj.json()
        if (!a.data && a.errors) {
            throw new Error(JSON.stringify(a.errors))
        } else {
            return a.data[Object.keys(a.data)[0]]
        }
    }
)

const backURL = 'http://shop-roles.node.ed.asmer.org.ua/'
const gql = getGQL(backURL + 'graphql');



const actionOrder = () => (
    async (dispatch, getState) => {
        let {cart} = getState()

        const orderGoods = Object.entries(cart)
            .map(([_id, {good, count}]) => ({good: {_id}, count}))

        let result = await dispatch(actionPromise('order', gql(`
                  mutation newOrder($order:OrderInput){
                    OrderUpsert(order:$order)
                      { _id total}
                  }
          `, {order: {orderGoods}})))
        if (result?._id) {
            dispatch(actionCartClear())
        }
    })



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

const actionFullLogin = (log, pass) => async (dispatch) => {
    let token = await dispatch(
        actionPromise(
            "login",
            gql(
                `query login($login: String, $password: String) {
            login(login: $login, password: $password)
            }`,
                { login: log, password: pass }
            )
        )
    );
    if (token) {
        dispatch(actionAuthLogin(token));
    }
};


const actionRegister = (login, password) => (
    actionPromise('register', gql(`mutation reg($user:UserInput) {
        UserUpsert(user:$user) {
        _id 
        }
    }
    `, {user: {login, password}})
    )
)

const actionFullRegister = (login, password) => (
    async (dispatch) => {
        let registerId = await dispatch(actionRegister(login, password))

        if (registerId) {
            dispatch(actionFullLogin(login, password))
        }
    }
)



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

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

const actionGoodsByUser = (_id) => (
    actionPromise('goodByUser', gql(`query oUser($query: String) {
        OrderFind(query:$query){
        _id orderGoods{
                price count total good{
                    _id name categories{
                    name
                    }
                    images {
                        url
                    }
                }
            } 
            owner {
            _id login
            }
        }
    }`,
        {query: JSON.stringify([{___owner: _id}])}))
)
const combinedReducer = combineReducers({promise: promiseReducer, auth: authReducer, cart: cartReducer})
const store = createStore(combinedReducer)

const CLoginForm = connect(null, {onLogin: actionLogin})(LoginForm)

function App() {
  return (
   <Provider store={store}>
       <div className="App">
           {/*<Header/>*/}
           {/*<Input />*/}
           <CLoginForm/>

           <Spoiler header={<h1>Заголовок!!!</h1>} open={false}>
               Контент 1
               <p>
                   лорем ипсум траливали и тп.
               </p>
           </Spoiler>
           <Spoiler header={<h1>Заголовок 2 !!!</h1>} open={false}>
               <h2>Контент 2</h2>
               <p>
                   лорем ипсум траливали и тп.
               </p>
           </Spoiler>
           <PasswordConfirm min={5}/>
           <RangeInput max={3} min={1} />
           <div className="main">
               <CategoryMenu />
               <Category />
           </div>
           <Footer />
       </div>
   </Provider>
  );
}

export default App;