const assert = require('node:assert/strict');
const http = require('node:http');
const test = require('node:test');
const jwt = require('jsonwebtoken');

const app = require('../app');
const db = require('../src/config/db');

const JWT_SECRET = process.env.JWT_SECRET || 'test-jwt-secret';
process.env.JWT_SECRET = JWT_SECRET;

let originalQuery;

const createToken = (payload = {}) =>
    jwt.sign(
        {
            id: 1,
            dni: '58045340X',
            id_proveedor: 675,
            ...payload
        },
        JWT_SECRET,
        { expiresIn: '1h' }
    );

const withServer = async (callback) =>
    new Promise((resolve, reject) => {
        const server = app.listen(0, '127.0.0.1');

        server.on('error', reject);
        server.on('listening', async () => {
            try {
                const result = await callback(server);
                server.close((closeError) => {
                    if (closeError) {
                        reject(closeError);
                        return;
                    }
                    resolve(result);
                });
            } catch (error) {
                server.close(() => reject(error));
            }
        });
    });

const requestJson = async ({ port, path, authorization }) =>
    new Promise((resolve, reject) => {
        const req = http.request(
            {
                hostname: '127.0.0.1',
                port,
                method: 'GET',
                path,
                headers: authorization ? { authorization } : {}
            },
            (res) => {
                let rawBody = '';

                res.on('data', (chunk) => {
                    rawBody += chunk;
                });

                res.on('end', () => {
                    const body = rawBody ? JSON.parse(rawBody) : null;
                    resolve({ statusCode: res.statusCode, body });
                });
            }
        );

        req.on('error', reject);
        req.end();
    });

test.before(() => {
    originalQuery = db.query;
});

test.after(() => {
    db.query = originalQuery;
});

test('GET /api/trips está registrado en /api', () => {
    const apiRouterLayers = app._router.stack.filter(
        (layer) =>
            layer.name === 'router' &&
            layer.regexp &&
            layer.regexp.toString().includes('^\\/api\\/?(?=\\/|$)')
    );

    assert.ok(apiRouterLayers.length > 0, 'Router /api is not mounted');

    const tripsRouteLayer = apiRouterLayers
        .flatMap((routerLayer) => routerLayer.handle.stack)
        .find(
            (layer) =>
                layer.route &&
                layer.route.path === '/trips' &&
                layer.route.methods.get
        );

    assert.ok(tripsRouteLayer, 'GET /api/trips route is not defined');
});

test('GET /api/trips devuelve viajes del transportista autenticado con aliases legacy e incluye asignados', async () => {
    const mockedTrips = [
        {
            id_viaje: 84919,
            cod_viaje: 'VIA-2026-0001',
            id_estado: 7,
            nombrea: 'Barcelona, ES',
            nombreb: 'Lyon, FR',
            fecha_salida: '2026-01-22 06:00:00',
            fecha_llegada: '2026-01-22 18:11:00'
        },
        {
            id_viaje: 84918,
            cod_viaje: 'VIA-2026-0000',
            id_estado: 1,
            nombrea: 'Madrid, ES',
            nombreb: 'Bilbao, ES',
            fecha_salida: '2026-01-21',
            fecha_llegada: '2026-01-21'
        }
    ];
    let callCount = 0;

    db.query = async (sql, params) => {
        callCount += 1;
        assert.match(sql, /FROM c_viajes_proveedor p/);
        assert.match(sql, /INNER JOIN c_viajes v/);
        assert.match(sql, /INNER JOIN m_proveedores_trasportistas t/);
        assert.match(sql, /id_estado IN \(\?, \?, \?, \?\)/);

        if (callCount === 1) {
            assert.match(sql, /COUNT\(\*\) AS total/);
            assert.deepEqual(params, ['58045340X', 7, 8, 9, 1]);
            return [[{ total: 2 }]];
        }

        assert.match(sql, /AS id_viaje/);
        assert.match(sql, /AS id_estado/);
        assert.match(sql, /AS nombrea/);
        assert.match(sql, /AS nombreb/);
        assert.match(sql, /AS fecha_salida/);
        assert.match(sql, /AS fecha_llegada/);
        assert.match(sql, /LIMIT \? OFFSET \?/);
        assert.deepEqual(params, ['58045340X', 7, 8, 9, 1, 25, 0]);
        return [mockedTrips];
    };

    const response = await withServer(async (server) =>
        requestJson({
            port: server.address().port,
            path: '/api/trips',
            authorization: `Bearer ${createToken()}`
        })
    );

    assert.equal(response.statusCode, 200);
    assert.deepEqual(response.body, {
        trips: mockedTrips,
        page: 1,
        limit: 25,
        total: 2,
        has_more: false
    });
    assert.equal(response.body.trips[0].id_estado, 7);
    assert.equal(response.body.trips[1].id_estado, 1);
});

test('GET /api/trips devuelve lista vacia cuando no hay viajes', async () => {
    let callCount = 0;

    db.query = async () => {
        callCount += 1;
        return callCount === 1 ? [[{ total: 0 }]] : [[]];
    };

    const response = await withServer(async (server) =>
        requestJson({
            port: server.address().port,
            path: '/api/trips',
            authorization: `Bearer ${createToken()}`
        })
    );

    assert.equal(response.statusCode, 200);
    assert.deepEqual(response.body, {
        trips: [],
        page: 1,
        limit: 25,
        total: 0,
        has_more: false
    });
});

test('GET /api/trips responde en menos de 1s para 25 viajes mockeados', async () => {
    const mockedTrips = Array.from({ length: 25 }, (_, index) => ({
        id_viaje: 100000 + index,
        cod_viaje: `VIA-2026-${String(index + 1).padStart(4, '0')}`,
        id_estado: index % 2 === 0 ? 7 : 4,
        nombrea: `ORIGEN ${index + 1}`,
        nombreb: `DESTINO ${index + 1}`,
        fecha_salida: '2026-01-22 06:00:00',
        fecha_llegada: '2026-01-22 18:11:00'
    }));

    let callCount = 0;

    db.query = async () => {
        callCount += 1;
        return callCount === 1 ? [[{ total: 500 }]] : [mockedTrips];
    };

    const startedAt = Date.now();
    const response = await withServer(async (server) =>
        requestJson({
            port: server.address().port,
            path: '/api/trips',
            authorization: `Bearer ${createToken()}`
        })
    );
    const elapsedMs = Date.now() - startedAt;

    assert.equal(response.statusCode, 200);
    assert.equal(response.body.trips.length, 25);
    assert.equal(response.body.total, 500);
    assert.equal(response.body.has_more, true);
    assert.ok(elapsedMs < 1000, `Expected < 1000ms, got ${elapsedMs}ms`);
});


test('GET /api/trips aplica paginacion y filtros en SQL', async () => {
    const mockedTrips = [
        {
            id_viaje: 84919,
            cod_viaje: 'VIA-2026-0001',
            id_estado: 7,
            nombrea: 'Barcelona, ES',
            nombreb: 'Lyon, FR',
            fecha_salida: '2026-06-30 06:00:00',
            fecha_llegada: '2026-06-30 18:11:00'
        }
    ];
    let callCount = 0;

    db.query = async (sql, params) => {
        callCount += 1;
        assert.match(sql, /v\.id_estado IN \(\?, \?, \?\)/);
        assert.match(sql, /COALESCE\(p\.fecha_salida, v\.fecha_salida\) >= \?/);
        assert.match(sql, /COALESCE\(p\.fecha_salida, v\.fecha_salida\) < \?/);

        if (callCount === 1) {
            assert.match(sql, /COUNT\(\*\) AS total/);
            assert.deepEqual(params, ['58045340X', 7, 8, 9, '2026-06-01', '2026-07-01']);
            return [[{ total: 26 }]];
        }

        assert.match(sql, /ORDER BY COALESCE\(p\.fecha_salida, v\.fecha_salida\) DESC, p\.id_viaje DESC/);
        assert.match(sql, /LIMIT \? OFFSET \?/);
        assert.deepEqual(params, ['58045340X', 7, 8, 9, '2026-06-01', '2026-07-01', 25, 25]);
        return [mockedTrips];
    };

    const response = await withServer(async (server) =>
        requestJson({
            port: server.address().port,
            path: '/api/trips?page=2&limit=25&status_ids=7,8,9&date_from=2026-06-01&date_to=2026-06-30',
            authorization: `Bearer ${createToken()}`
        })
    );

    assert.equal(response.statusCode, 200);
    assert.equal(response.body.page, 2);
    assert.equal(response.body.limit, 25);
    assert.equal(response.body.total, 26);
    assert.equal(response.body.has_more, false);
    assert.deepEqual(response.body.trips, mockedTrips);
});

test('GET /api/trips valida parametros invalidos', async () => {
    db.query = async () => {
        throw new Error('db.query should not be called with invalid params');
    };

    const invalidPaths = [
        '/api/trips?page=0',
        '/api/trips?limit=101',
        '/api/trips?status_ids=7,x',
        '/api/trips?date_from=2026-02-30',
        '/api/trips?date_from=2026-07-01&date_to=2026-06-30'
    ];

    for (const path of invalidPaths) {
        const response = await withServer(async (server) =>
            requestJson({
                port: server.address().port,
                path,
                authorization: `Bearer ${createToken()}`
            })
        );

        assert.equal(response.statusCode, 400, path);
        assert.equal(response.body.success, false);
    }
});

test('GET /api/trips devuelve 401 sin token', async () => {
    db.query = async () => {
        throw new Error('db.query should not be called without token');
    };

    const response = await withServer(async (server) =>
        requestJson({
            port: server.address().port,
            path: '/api/trips'
        })
    );

    assert.equal(response.statusCode, 401);
    assert.deepEqual(response.body, { error: 'Unauthorized' });
});

test('GET /api/trips devuelve 500 en error interno', async () => {
    db.query = async () => {
        throw new Error('forced db failure');
    };

    const response = await withServer(async (server) =>
        requestJson({
            port: server.address().port,
            path: '/api/trips',
            authorization: `Bearer ${createToken()}`
        })
    );

    assert.equal(response.statusCode, 500);
    assert.deepEqual(response.body, {
        success: false,
        error: 'Internal server error'
    });
});