module.exports = async function (app, opts) {
    const db = require('../db');
    const counterCreated = opts.counterCreated;
    const counterDeleted = opts.counterDeleted;
    const gaugeCount = opts.gaugeCount;

    function refreshGauge() {
        try {
            const count = db.all().length;
            gaugeCount.set(count);
        } catch { }
    }

    app.get('/ui', async (req, reply) => {
        if (!req.session.user) {
            return reply.view('login_required.ejs', { user: req.session.user });
        }
        const todos = db.getTodosByUser(req.session.user.id);
        return reply.view('index.ejs', { todos, user: req.session.user });
    });

    app.post('/ui/todos', async (req, reply) => {
        const title = (req.body?.title || '').trim();
        if (title) {
            db.createTodo(req.session.user.id, title);
            counterCreated.inc();
            refreshGauge();
        }
        reply.redirect('/ui');
    });

    app.post('/ui/todos/:id/toggle', async (req, reply) => {
        const id = Number(req.params.id);
        const todo = db.getTodo(id);
        if (todo) {
            db.updateTodo(id, { completed: todo.completed ? 0 : 1 });
            refreshGauge();
        }
        reply.redirect('/ui');
    });

    app.post('/ui/todos/:id/delete', async (req, reply) => {
        const id = Number(req.params.id);
        if (db.getTodo(id)) {
            db.removeTodo(id);
            counterDeleted.inc();
            refreshGauge();
        }
        reply.redirect('/ui');
    });
};