// server.js
const path = require('path');
const Fastify = require('fastify');
const formBody = require('@fastify/formbody');
const fastifyStatic = require('@fastify/static');
const fastifyView = require('@fastify/view');
const ejs = require('ejs');
const promClient = require('prom-client');
const fastifyCookie = require('@fastify/cookie');
const fastifySession = require('@fastify/session');

// --- App Instance ---
const app = Fastify({ logger: true });

// --- Plugins ---
app.register(formBody);
app.register(fastifyCookie);
app.register(fastifySession, {
    secret: 'this_very_long_random_secret_32_chars_minimum!',
    cookie: { secure: false },
    saveUninitialized: false,
});
app.register(fastifyStatic, {
    root: path.join(__dirname, 'public'),
    prefix: '/static/',
});
app.register(fastifyView, {
    engine: { ejs },
    root: path.join(__dirname, 'views'),
    layout: 'layout.ejs',
});

// --- Prometheus Metrics ---
const register = new promClient.Registry();
promClient.collectDefaultMetrics({ register });

const counterCreated = new promClient.Counter({
    name: 'todo_created_total',
    help: 'Nombre total de todos créés',
});
const counterDeleted = new promClient.Counter({
    name: 'todo_deleted_total',
    help: 'Nombre total de todos supprimés',
});
const gaugeCount = new promClient.Gauge({
    name: 'todo_count',
    help: 'Nombre courant de todos',
});
register.registerMetric(counterCreated);
register.registerMetric(counterDeleted);
register.registerMetric(gaugeCount);

const fastifySwagger = require('@fastify/swagger');
const fastifySwaggerUI = require('@fastify/swagger-ui');

// --- Swagger ---
app.register(fastifySwagger, {
    openapi: {
        info: {
            title: 'Todo API',
            version: '1.0.0',
            description: 'CRUD de Todo en Fastify (Node.js) + SQLite',
        },
        servers: [{ url: 'http://localhost:3000' }],
    },
});
app.register(fastifySwaggerUI, {
    routePrefix: '/api/docs',
    uiConfig: {
        docExpansion: 'full',
        deepLinking: false
    }
});

// --- Routes ---
app.register(require('./routes/api'), {
    promRegister: register,
    counterCreated,
    counterDeleted,
    gaugeCount,
});
app.register(require('./routes/ui'), {
    counterCreated,
    counterDeleted,
    gaugeCount,
});
app.register(require('./routes/other'), {
    promRegister: register,
});

// --- Start Server ---
async function start() {
    try {
        await app.ready();
        app.swagger();
        await app.listen({ port: 3000, host: 'localhost' });
        app.log.info('Server listening on http://localhost:3000');
    } catch (err) {
        app.log.error(err);
        process.exit(1);
    }
}
start();