"use strict";

const app = require('express')();
const line_login = require("line-login");
const session = require("express-session");
const session_options = {
    secret: process.env.LINE_LOGIN_CHANNEL_SECRET,
    resave: false,
    saveUninitialized: false
}
app.use(session(session_options));

const login = new line_login({
    channel_id: process.env.LINE_LOGIN_CHANNEL_ID,
    channel_secret: process.env.LINE_LOGIN_CHANNEL_SECRET,
    callback_url: process.env.LINE_LOGIN_CALLBACK_URL,
    scope: "openid profile",
    prompt: "consent",
    bot_prompt: "normal"
});

app.listen(process.env.PORT || 5000, () => {
    console.log(`server is listening to ${process.env.PORT || 5000}...`);
});

// Specify the path you want to start authorization.
app.use("/", login.auth());

// Specify the path you want to wait for the callback from LINE authorization endpoint.
app.use("/callback", login.callback(
    (req, res, next, token_response) => {
        // Success callback
        res.json(token_response);
    },
    (req, res, next, error) => {
        // Failure callback
        res.status(400).json(error);
    }
));