import axios from 'axios'
import jwtDefaultConfig from './jwtDefaultConfig'

export default class JwtService {
    // ** jwtConfig <= Will be used by this service
    jwtConfig = {...jwtDefaultConfig}

    // ** For Refreshing Token
    isAlreadyFetchingAccessToken = false

    // ** For Refreshing Token
    subscribers = []

    constructor(jwtOverrideConfig) {
        this.jwtConfig = {...this.jwtConfig, ...jwtOverrideConfig}

        // ** Request Interceptor
        axios.interceptors.request.use(
            config => {
                // ** Get token from localStorage
                const accessToken = this.getToken()

                // ** If token is present add it to request's Authorization Header
                if (accessToken) {
                    // ** eslint-disable-next-line no-param-reassign
                    config.headers.Authorization = `${this.jwtConfig.tokenType} ${accessToken}`
                }

                config.headers['X-Authorization'] = process.env.REACT_APP_API_KEY

                return config
            },
            error => Promise.reject(error)
        )

        // ** Add request/response interceptor
        axios.interceptors.response.use(
            response => response,
            error => {
                // ** const { config, response: { status } } = error
                const {config, response} = error
                const originalRequest = config
                const reqUrl = config?.url || ''

                // ** if (status === 401) {
                if (response && response.status === 401) {
                    const isPublicAuthRequest =
                        reqUrl.includes('/login') ||
                        reqUrl.includes('/ldap-login') ||
                        reqUrl.includes('/refresh-token')
                    if (isPublicAuthRequest) {
                        return Promise.reject(error)
                    }

                    if (!this.isAlreadyFetchingAccessToken) {
                        this.isAlreadyFetchingAccessToken = true
                        this.refreshToken()
                            .then(r => {
                                this.isAlreadyFetchingAccessToken = false

                                // ** Update accessToken in localStorage
                                this.setToken(r.data.accessToken)
                                this.setRefreshToken(r.data.refreshToken)

                                this.onAccessTokenFetched(r.data.accessToken)
                            })
                            .catch(refreshError => {
                                this.isAlreadyFetchingAccessToken = false
                                this.onAccessTokenFetchFailed(refreshError)
                            })
                    }
                    const retryOriginalRequest = new Promise((resolve, reject) => {
                        this.addSubscriber(
                            accessToken => {
                                // ** Make sure to assign accessToken according to your response.
                                // ** Check: https://pixinvent.ticksy.com/ticket/2413870
                                // ** Change Authorization header
                                originalRequest.headers.Authorization = `${this.jwtConfig.tokenType} ${accessToken}`
                                resolve(axios(originalRequest))
                            },
                            reject
                        )
                    })
                    return retryOriginalRequest
                }
                return Promise.reject(error)
            }
        )
    }

    onAccessTokenFetched(accessToken) {
        this.subscribers.forEach(({ onSuccess }) => onSuccess(accessToken))
        this.subscribers = []
    }

    onAccessTokenFetchFailed(refreshError) {
        this.subscribers.forEach(({ onFailure }) => onFailure(refreshError))
        this.subscribers = []
    }

    addSubscriber(onSuccess, onFailure) {
        this.subscribers.push({ onSuccess, onFailure })
    }

    getToken() {
        return localStorage.getItem(this.jwtConfig.storageTokenKeyName)
    }

    getRefreshToken() {
        return localStorage.getItem(this.jwtConfig.storageRefreshTokenKeyName)
    }

    setToken(value) {
        localStorage.setItem(this.jwtConfig.storageTokenKeyName, value)
    }

    setRefreshToken(value) {
        localStorage.setItem(this.jwtConfig.storageRefreshTokenKeyName, value)
    }

    login(...args) {
        return axios.post(this.jwtConfig.loginEndpoint, ...args)
    }

    register(...args) {
        return axios.post(this.jwtConfig.registerEndpoint, ...args)
    }

    refreshToken() {
        return axios.post(this.jwtConfig.refreshEndpoint, {
            refreshToken: this.getRefreshToken()
        })
    }
}