const config = require("../config.js")
    ,Slack = require("../src/slack.js").Slack
    ,slackManager = require("../src/slackManager.js").SlackManager
    ,accountManager = require("../src/accounts.js").accountManager
    ,templates = require('./_templates.js');

function checkTokens(service, req, cb) {
    switch (service) {
        case "slack":
            if (req.urlObj.queryTokens.code) {
                Slack.getUserMail(req.urlObj.queryTokens.code, config.login.slack.redirect_uri, (email) => {
                    cb(email);
                });
            } else {
                cb(null);
            }
        break;

        default:
            cb(null);
        break;
    }
}

function makeLoginPage() {
    var slackUri = "https://slack.com/oauth/authorize"
        +"?client_id=" +config.login.slack.clientId
        +"&scope=" +slackManager.getAuthScope().join(',')
        +"&redirect_uri=" +config.login.slack.redirect_uri;

    return templates.header("Mimou - login", ["login.css"])
        +`<div class="services"><h1>Login</h1>`
        +`<a href="${slackUri}"><img src="https://platform.slack-edge.com/img/sign_in_with_slack.png" srcset="https://platform.slack-edge.com/img/sign_in_with_slack.png 1x, https://platform.slack-edge.com/img/sign_in_with_slack@2x.png 2x" /></a>`
        +`</div>`
        +templates.footer();
}

module.exports.match = function(url) {
    if (url.urlParts.length === 1) {
        return true;
    } else if (url.urlParts.length === 2 && Object.keys(config.login).indexOf(url.urlParts[1]) >= 0) {
        return true;
    }
    return false;
};

module.exports.exec = function(req, res) {
    if (!req.urlObj.urlParts[1]) {
        res.end(makeLoginPage());
    } else {
        checkTokens(req.urlObj.urlParts[1], req, (email) => {
            if (email) {
                req.account = accountManager.fromSlackEmail(email)
                req.session = sessionManager.lazyForRequest(req);
                req.session.setSlackToken(req.reqT, token);
                res.writeHeader("302", {
                    Location: config.rootUrl
                ,"Set-Cookie": "sessID="+req.session.sessId
                });
                sessionManager.saveSession(req.session);
                res.end();
            } else {
                res.end(makeLoginPage());
            }
        });
    }
};

module.exports.needLogin = false;