// errors.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 { History } from 'history'

import { setFieldNotification } from '../actions/forms'
import { showNotification } from '../actions/notifications'
import { AppThunkDispatch, FormNotification, NotificationType } from '../types'

export function handleApiError(err: HttpError, dispatch: AppThunkDispatch, history?: History) {
    console.error('Error:', err)

    if (err instanceof ServerError) {
        dispatch(showNotification(NotificationType.Error, 'Server Error'))
        return
    }

    if (err instanceof BadRequestError) {
        dispatch(showNotification(NotificationType.Error, `Error: ${err.message}`))
        
        for (const error of err.errors) {
            const { field, type, message } = error
            if (field) dispatch(setFieldNotification(field, type, message))
        }

        return
    }

    if (err instanceof UnauthorizedError) {
        dispatch(showNotification(NotificationType.Error, 'You need to be logged in.'))
        if (history) history.push('/login')
        return
    }

    if (err instanceof NotFoundError) {
        dispatch(showNotification(NotificationType.Error, 'Not found.'))
        return
    }

    dispatch(showNotification(NotificationType.Error, `Error: ${err.message}`))
}

export class HttpError extends Error {
    statusCode: number
    errors: FormNotification[]

    constructor(message = 'Unknown Error') {
        super(message)

        this.name = 'HttpError'
        this.statusCode = 500
        this.errors = []
    }
}

export class ServerError extends HttpError {
    constructor() {
        super('Server Error')

        this.name = 'ServerError'
        this.statusCode = 500
    }
}

export class BadRequestError extends HttpError {
    constructor(message = 'Bad Request', errors: FormNotification[] = []) {
        super(message)

        this.name = 'BadRequestError'
        this.statusCode = 400
        this.errors = errors
    }
}

export class UnauthorizedError extends HttpError {
    constructor(message = 'Unauthorized') {
        super(message)

        this.name = 'UnauthorizedError'
        this.statusCode = 401
    }
}

export class ForbiddenError extends HttpError {
    constructor(message = 'Forbidden') {
        super(message)

        this.name = 'ForbiddenError'
        this.statusCode = 403
    }
}

export class NotFoundError extends HttpError {
    constructor(message = 'Not Found') {
        super(message)

        this.name = 'NotFoundError'
        this.statusCode = 404
    }
}