/** @module users/state */
import { call, put, takeEvery } from 'redux-saga/effects'
import jwt from 'jwt-simple'

/**
* state.js
*
* Collection of everything which has to do with state changes.
**/

/** actionTypes define what actions are handeled by the reducer. */
export const actions = {
    loginRequest: (data) => {
        return {
            type: 'USER/LOGIN_REQUEST',
            data
        }
    },
    loginSuccess: (token, tokenData) => {
        return {
            type: 'USER/LOGIN_SUCCESS',
            token,
            tokenData
        }
    },
    loginFailure: () => {
        return {
            type: 'USER/LOGIN_FAILURE'
        }
    },
    getUserList: () => {
        return {
            type: 'USER/GET_USER_LIST'
        }
    },
    userListSuccess: (users) => {
        return {
            type: 'USER/GET_USER_LIST_SUCCESS',
            users
        }
    },
    userListFailure: () => {
        return {
            type: 'USER/GET_USER_LIST_FAILURE'
        }
    },
    addUserRequest: (data) => {
        return {
            type: 'USER/ADD_REQUEST',
            data
        }
    },
    addUserSuccess: (data) => {
        return {
            type: 'USER/ADD_SUCCESS',
            data
        }
    },
    addUserFailure: () => {
        return {
            type: 'USER/ADD_FAILURE'
        }
    }
}
console.log('State actions', actions)

/** state definition */
export const state = {
    loginRequested: false,
    userListRequested: false,
    userListInitialized: false,
    users: [],
    token: null,
    tokenData: null
}
console.log('State state', state)

/** reducer is called by the redux dispatcher and handles all component actions */
export function reducer (state = [], action) {
    switch (action.type) {
        case 'USER/LOGIN_REQUEST':
            return { ...state, loginRequested: true }
        case 'USER/LOGIN_SUCCESS':
            return { ...state, loginRequested: false, token: action.token, tokenData: action.tokenData }
        case 'USER/LOGIN_FAILURE':
            return { ...state, loginRequested: false }
        case 'USER/GET_USER_LIST':
            return { ...state, userListRequested: true, userListInitialized: true }
        case 'USER/GET_USER_LIST_SUCCESS':
            return { ...state, userListRequested: false, users: action.users }
        case 'USER/GET_USER_LIST_FAILURE':
            return { ...state, userListRequested: false }
        default:
            return state
    }
}

function * login (action) {
    try {
        console.log('User login requested', action.data)
        const response = yield call(fetch, 'http://localhost:3002/authenticate/login', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(action.data)
        })
        const responseJson = yield response.json()
        if (response.status != 200) {
            console.log(responseJson.msg)
            throw new Error(responseJson.msg)
        }
        const { token } = responseJson
        const tokenData = jwt.decode(token, null, true)
        localStorage.setItem('accessToken', token)
        localStorage.setItem('accessTokenData', JSON.stringify(tokenData))
        console.log('User login success!', token, tokenData)
        yield put(actions.loginSuccess(token, tokenData))
    } catch (error) {
        console.log('User login failure!', error)
        yield put(actions.loginFailure(error))
    }
}

function * getUserList (action) {
    try {
        const token = localStorage.getItem('accessToken')
        console.log('User list requested', action, token)
        const response = yield call(fetch, 'http://localhost:3002/api/users', {
            method: 'GET',
            headers: new Headers({
                'Content-Type': 'application/json',
                'x-access-token': token
            })
        })
        console.log('Received response')
        const responseJson = yield response.json()
        if (response.status != 200) {
            console.log('User list received error', responseJson.msg)
            throw new Error(responseJson.msg)
        }
        console.log('Get user list success!', responseJson.users)
        yield put(actions.userListSuccess(responseJson.users))
    } catch (error) {
        console.log('Get user list failure!', error)
        yield put(actions.userListFailure(error.toString()))
    }
}

/** sagas are asynchronous workers (JS generators) to handle the state. */
export function * saga () {
    console.log('User saga started.')
    yield takeEvery('USER/LOGIN_REQUEST', login)
    yield takeEvery('USER/GET_USER_LIST', getUserList)
}