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

module.exports = async function (app, opts) {
    const db = require('../db');
    const promClient = require('prom-client');

    // --- Schémas pour Swagger ---
    const Todo = {
        type: 'object',
        properties: {
            id: { type: 'integer' },
            title: { type: 'string' },
            completed: { type: 'integer', enum: [0, 1] },
            created_at: { type: 'string' },
        },
    };
    const TodoCreate = {
        type: 'object',
        required: ['title'],
        properties: { title: { type: 'string' } },
    };
    const TodoUpdate = {
        type: 'object',
        properties: {
            title: { type: 'string' },
            completed: { type: 'integer', enum: [0, 1] },
        },
    };

    // --- Prometheus ---
    const register = opts.promRegister;
    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('/api/todos', {
        schema: {
            response: { 200: { type: 'array', items: Todo } },
            tags: ['todos'],
        },
    }, async () => db.allTodos());

    app.get('/api/todos/:id', {
        schema: {
            params: { type: 'object', properties: { id: { type: 'integer' } }, required: ['id'] },
            response: { 200: Todo, 404: { type: 'object', properties: { message: { type: 'string' } } } },
            tags: ['todos'],
        },
    }, async (req, reply) => {
        const todo = db.getTodo(req.params.id);
        if (!todo) return reply.code(404).send({ message: 'Not found' });
        return todo;
    });

    app.post('/api/todos', {
        schema: {
            body: TodoCreate,
            response: { 201: Todo },
            tags: ['todos'],
        },
    }, async (req, reply) => {
        const { title } = req.body;
        const users_id = req.session?.user?.id || 1;
        const result = db.createTodo(users_id, title);
        counterCreated.inc();
        refreshGauge();
        const created = db.getTodo(result.lastInsertRowid);
        reply.code(201);
        return created;
    });

    app.patch('/api/todos/:id', {
        schema: {
            params: { type: 'object', properties: { id: { type: 'integer' } }, required: ['id'] },
            body: TodoUpdate,
            response: { 200: Todo, 404: { type: 'object', properties: { message: { type: 'string' } } } },
            tags: ['todos'],
        },
    }, async (req, reply) => {
        const id = req.params.id;
        if (!db.getTodo(id)) return reply.code(404).send({ message: 'Not found' });
        db.updateTodo(id, req.body || {});
        const updated = db.getTodo(id);
        refreshGauge();
        return updated;
    });

    app.delete('/api/todos/:id', {
        schema: {
            params: { type: 'object', properties: { id: { type: 'integer' } }, required: ['id'] },
            response: { 204: { type: 'null' } },
            tags: ['todos'],
        },
    }, async (req, reply) => {
        const id = req.params.id;
        const existing = db.getTodo(id);
        if (existing) {
            db.removeTodo(id);
            counterDeleted.inc();
            refreshGauge();
        }
        reply.code(204).send();
    });

    // Route pour voir tous les users
    app.get('/api/users', {
        schema: {
            response: {
                200: {
                    type: 'array',
                    items: {
                        type: 'object',
                        properties: {
                            id: { type: 'integer' },
                            pseudo: { type: 'string' },
                            discord_id: { type: 'string' },
                            created_at: { type: 'string' }
                        }
                    }
                }
            },
            tags: ['users'],
        }
    }, async () => db.allUsers());

    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' }],
        },
    });
};