'use strict';

exports = module.exports = {
    loadClient,
    addClient,
    listClients,
    getClient,
    updateClient,
    delClient,

    destroyUserSession
};

const assert = require('assert'),
    BoxError = require('../boxerror.js'),
    hat = require('../hat.js'),
    oidc = require('../oidc.js'),
    HttpError = require('connect-lastmile').HttpError,
    HttpSuccess = require('connect-lastmile').HttpSuccess,
    safe = require('safetydance'),
    tokens = require('../tokens.js');

async function addClient(req, res, next) {
    assert.strictEqual(typeof req.body, 'object');

    if (typeof req.body.name !== 'string' || !req.body.name) return next(new HttpError(400, 'name must be non-empty string'));
    if (typeof req.body.loginRedirectUri !== 'string') return next(new HttpError(400, 'loginRedirectUri must be non-empty string'));
    if (req.body.tokenSignatureAlgorithm !== 'EdDSA' && req.body.tokenSignatureAlgorithm !== 'RS256') return next(new HttpError(400, 'tokenSignatureAlgorithm must be either EdDSA or RS256'));

    // clients with appId are internal only
    if (req.body.appId) return next(new HttpError(400, 'appId cannot be specified'));

    const clientId = 'cid-' + hat(128);
    const data = {
        secret: hat(256),
        name: req.body.name,
        appId: '', // always empty for custom clients
        tokenSignatureAlgorithm: req.body.tokenSignatureAlgorithm,
        loginRedirectUri: req.body.loginRedirectUri
    };

    const [error] = await safe(oidc.addClient(clientId, data));
    if (error) return next(BoxError.toHttpError(error));

    data.id = clientId;

    next(new HttpSuccess(201, data));
}

async function loadClient(req, res, next) {
    assert.strictEqual(typeof req.params.clientId, 'string');

    const [error, client] = await safe(oidc.getClient(req.params.clientId));
    if (error) return next(BoxError.toHttpError(error));
    if (!client) return next(new HttpError(404, 'OIDC client not found'));
    if (client.appId) return next(new HttpError(422, 'OIDC client of an internal app'));

    req.oidcClient = client;
    next();
}

async function getClient(req, res, next) {
    assert.strictEqual(typeof req.params.clientId, 'string');

    next(new HttpSuccess(200, req.oidcClient));
}

async function updateClient(req, res, next) {
    assert.strictEqual(typeof req.params.clientId, 'string');
    assert.strictEqual(typeof req.body, 'object');

    if (typeof req.body.name !== 'string' || !req.body.name) return next(new HttpError(400, 'name must be non-empty string'));
    if (typeof req.body.loginRedirectUri !== 'string' || !req.body.loginRedirectUri) return next(new HttpError(400, 'loginRedirectUri must be non-empty string'));
    if (req.body.tokenSignatureAlgorithm !== 'EdDSA' && req.body.tokenSignatureAlgorithm !== 'RS256') return next(new HttpError(400, 'tokenSignatureAlgorithm must be either EdDSA or RS256'));

    const data = {
        name: req.body.name,
        appId: '', // always empty for custom clients
        tokenSignatureAlgorithm: req.body.tokenSignatureAlgorithm,
        loginRedirectUri: req.body.loginRedirectUri
    };

    const [updateError] = await safe(oidc.updateClient(req.params.clientId, data));
    if (updateError) return next(BoxError.toHttpError(updateError));

    next(new HttpSuccess(201, {}));
}

async function listClients(req, res, next) {
    const [error, result] = await safe(oidc.listClients());
    if (error) return next(BoxError.toHttpError(error));

    next(new HttpSuccess(200, { clients: result.filter(client => !client.appId) }));
}

async function delClient(req, res, next) {
    assert.strictEqual(typeof req.params.clientId, 'string');

    const [delError] = await safe(oidc.delClient(req.params.clientId));
    if (delError) return next(BoxError.toHttpError(delError));

    next(new HttpSuccess(204));
}

async function destroyUserSession(req, res, next) {
    assert.strictEqual(typeof req.user, 'object');

    const [error] = await safe(oidc.revokeByUserId(req.user.id));
    if (error) return next(BoxError.toHttpError(error));

    await safe(tokens.del(req.token.id));

    next(new HttpSuccess(204));
}