// authentication.ts
// Copyright (C) 2020  Dwayne Harris

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

import { Action } from 'redux'

import { apiFetch } from '../api'
import { setEntities } from '../actions/entities'
import { startRequest, finishRequest } from '../actions/requests'
import { normalize } from '../utils/normalization'

import {
    LOCAL_STORAGE_ACCESS_TOKEN_KEY,
    LOCAL_STORAGE_REFRESH_TOKEN_KEY,
    LOCAL_STORAGE_ACCESS_TOKEN_EXPIRES_AT_KEY,
} from '../constants'

import { AppThunkAction, Entity, RequestKey, EntityType, Settings } from '../types'

export interface SetCheckedAction extends Action {
    type: 'AUTHENTICATION_SET_CHECKED'
}

export interface SetAuthenticatedAction extends Action {
    type: 'AUTHENTICATION_SET_AUTHENTICATED'
    payload: boolean
}

export interface SetUserAction extends Action {
    type: 'AUTHENTICATION_SET_USER'
    payload: string
}

export interface UnauthenticateAction extends Action {
    type: 'AUTHENTICATION_UNAUTHENTICATE'
}

export type AuthenticationActions = SetCheckedAction | SetAuthenticatedAction | SetUserAction | UnauthenticateAction

export const setChecked = (): SetCheckedAction => ({
    type: 'AUTHENTICATION_SET_CHECKED',
})

export const setAuthenticated = (authenticated: boolean): SetAuthenticatedAction => ({
    type: 'AUTHENTICATION_SET_AUTHENTICATED',
    payload: authenticated,
})

export const setUser = (userId: string): SetUserAction => ({
    type: 'AUTHENTICATION_SET_USER',
    payload: userId,
})

export const unauthenticate = (): UnauthenticateAction => ({
    type: 'AUTHENTICATION_UNAUTHENTICATE',
})

export const fetchSelf = (): AppThunkAction => async dispatch => {
    dispatch(startRequest(RequestKey.FetchSelf))

    try {
        const self = await apiFetch<Entity>({
            path: '/v1/self',
        })

        const result = normalize([self], EntityType.User)

        dispatch(setEntities(result.entities))
        dispatch(setUser(self.id))
        dispatch(setAuthenticated(true))

        dispatch(finishRequest(RequestKey.FetchSelf, true))
    } catch (err) {
        dispatch(setAuthenticated(false))
        dispatch(finishRequest(RequestKey.FetchSelf, false))
        throw err
    }
}

interface AuthenticateResponse {
    id: string
    access: string
    refresh: string
    expires: number
}

export const authenticate = (name: string, password: string): AppThunkAction<string> => async dispatch => {
    dispatch(startRequest(RequestKey.Authenticate))

    try {
        const response = await apiFetch<AuthenticateResponse>({
            path: '/v1/authenticate',
            method: 'post',
            body: {
                id: name,
                password,
            },
        })

        localStorage.setItem(LOCAL_STORAGE_ACCESS_TOKEN_KEY, response.access)
        localStorage.setItem(LOCAL_STORAGE_REFRESH_TOKEN_KEY, response.refresh)
        if (response.expires) localStorage.setItem(LOCAL_STORAGE_ACCESS_TOKEN_EXPIRES_AT_KEY, response.expires.toString())

        dispatch(finishRequest(RequestKey.Authenticate, true))
        await dispatch(fetchSelf())
        
        return response.id
    } catch (err) {
        dispatch(finishRequest(RequestKey.Authenticate, false))
        throw err
    }
}

interface UpdateSelfOptions {
    name: string
    about: string
    requiresApproval: boolean
    privacy: string
    imageUrl: string
    coverImageUrl: string
    theme: string
    settings: Settings
}

export const updateSelf = (options: UpdateSelfOptions): AppThunkAction => async dispatch => {
    const { name, about, requiresApproval, privacy, imageUrl, coverImageUrl, theme, settings } = options
    dispatch(startRequest(RequestKey.UpdateSelf))

    try {
        const self = await apiFetch<Entity>({
            path: '/v1/self',
            method: 'put',
            body: {
                name,
                about,
                requiresApproval,
                privacy,
                imageUrl,
                coverImageUrl,
                theme,
                settings,
            },
        })

        const result = normalize([self], EntityType.User)

        dispatch(setEntities(result.entities))
        dispatch(setUser(self.id))
        dispatch(setAuthenticated(true))

        dispatch(finishRequest(RequestKey.UpdateSelf, true))
    } catch (err) {
        dispatch(finishRequest(RequestKey.UpdateSelf, false))
        throw err
    }
}