import { beforeEach, describe, expect, it, afterEach } from 'bun:test';
import Database from 'bun:sqlite';
import { initializeDatabase } from '../../../src/db';
import { MaintenanceService } from '../../../src/services/maintenance';
import { toIsoSqlUTC } from '../../../src/utils/datetime';
import { Metrics } from '../../../src/services/metrics';

function makeMem(): any {
  const db = new Database(':memory:');
  initializeDatabase(db);
  return db;
}

describe('MaintenanceService', () => {
  let memdb: any;

  beforeEach(() => {
    memdb = makeMem();
  });

  it('cleanupInactiveMembersOnce elimina miembros inactivos más antiguos que el umbral', async () => {
    // Grupo y usuarios
    memdb.exec(`INSERT OR IGNORE INTO groups (id, community_id, name, active) VALUES ('g1@g.us','comm','G',1);`);
    memdb.exec(`INSERT OR IGNORE INTO users (id) VALUES ('111');`);
    memdb.exec(`INSERT OR IGNORE INTO users (id) VALUES ('222');`);

    // last_seen_at muy antiguo → debe borrarse
    memdb.exec(`
      INSERT INTO group_members (group_id, user_id, is_admin, is_active, first_seen_at, last_seen_at)
      VALUES ('g1@g.us','111',0,0,'2020-01-01 00:00:00','2020-01-01 00:00:00');
    `);
    // last_seen_at reciente → no debe borrarse
    const recent = toIsoSqlUTC(new Date(Date.now() - 12 * 60 * 60 * 1000));
    memdb.exec(`
      INSERT INTO group_members (group_id, user_id, is_admin, is_active, first_seen_at, last_seen_at)
      VALUES ('g1@g.us','222',0,0,'${recent}','${recent}');
    `);

    const deleted = await MaintenanceService.cleanupInactiveMembersOnce(memdb, 1);
    expect(deleted).toBe(1);

    const rows = memdb.prepare(`SELECT user_id FROM group_members ORDER BY user_id`).all() as any[];
    const remaining = rows.map(r => r.user_id);
    expect(remaining).toEqual(['222']);
  });

  it('cleanupInactiveMembersOnce no hace nada si retención <= 0', async () => {
    const deleted = await MaintenanceService.cleanupInactiveMembersOnce(memdb, 0);
    expect(deleted).toBe(0);
  });

  it('reconcileAliasUsersOnce fusiona alias a usuario real en tablas principales', async () => {
    // Sembrar usuarios
    memdb.exec(`INSERT OR IGNORE INTO users (id) VALUES ('alias-1');`);
    memdb.exec(`INSERT OR IGNORE INTO users (id) VALUES ('real-1');`);

    // Tarea creada por alias y asignaciones usando alias
    const res = memdb.prepare(`
      INSERT INTO tasks (description, due_date, group_id, created_by, completed, completed_at)
      VALUES ('T1', NULL, NULL, 'alias-1', 0, NULL)
    `).run() as any;
    const taskId = Number(res.lastInsertRowid);
    memdb.exec(`
      INSERT OR IGNORE INTO task_assignments (task_id, user_id, assigned_by)
      VALUES (${taskId}, 'alias-1', 'alias-1');
    `);

    // Tabla de alias
    memdb.exec(`
      INSERT OR IGNORE INTO user_aliases (alias, user_id, source)
      VALUES ('alias-1', 'real-1', 'test');
    `);

    const merged = await MaintenanceService.reconcileAliasUsersOnce(memdb);
    expect(merged).toBeGreaterThanOrEqual(1);

    const tRow = memdb.prepare(`SELECT created_by FROM tasks WHERE id = ?`).get(taskId) as any;
    expect(String(tRow.created_by)).toBe('real-1');

    const aRows = memdb.prepare(`SELECT user_id, assigned_by FROM task_assignments WHERE task_id = ?`).all(taskId) as any[];
    expect(aRows.length).toBe(1);
    expect(String(aRows[0].user_id)).toBe('real-1');
    expect(String(aRows[0].assigned_by)).toBe('real-1');
  });

  it('reconcileAliasUsersOnce retorna 0 si no existe la tabla user_aliases', async () => {
    try {
      memdb.exec(`DROP TABLE IF EXISTS user_aliases;`);
    } catch {}
    const merged = await MaintenanceService.reconcileAliasUsersOnce(memdb);
    expect(merged).toBe(0);
  });
});

describe('MaintenanceService - Evolution health check', () => {
  let originalFetch: any;
  const ENV_KEYS = ['METRICS_ENABLED', 'EVOLUTION_API_URL', 'EVOLUTION_API_INSTANCE', 'EVOLUTION_API_KEY', 'HEALTH_CHECK_RESTART_COOLDOWN_MS', 'HEALTH_CHECK_INTERVAL_MS'];
  const savedEnv: Record<string, string | undefined> = {};

  beforeEach(() => {
    // Guardar y configurar entorno mínimo para habilitar métricas y health-check
    for (const k of ENV_KEYS) savedEnv[k] = process.env[k];
    process.env.METRICS_ENABLED = 'true';
    process.env.EVOLUTION_API_URL = 'http://evo';
    process.env.EVOLUTION_API_INSTANCE = 'inst';
    process.env.EVOLUTION_API_KEY = 'key';
    process.env.HEALTH_CHECK_RESTART_COOLDOWN_MS = '0'; // facilitar intentos de reinicio en tests

    // Resetear métricas y estado interno
    Metrics.reset();
    (MaintenanceService as any)._lastEvolutionState = null;
    (MaintenanceService as any)._lastStateChangeTs = 0;
    (MaintenanceService as any)._lastRestartAttempt = 0;

    // Guardar fetch original
    originalFetch = globalThis.fetch;
  });

  afterEach(() => {
    // Restaurar entorno
    for (const k of ENV_KEYS) {
      if (savedEnv[k] == null) delete (process.env as any)[k];
      else process.env[k] = savedEnv[k];
    }
    // Restaurar fetch
    globalThis.fetch = originalFetch;
    // Reset de métricas tras cada caso
    Metrics.reset();
  });

  it('registra y actualiza métricas en transición de estado (open → closed)', async () => {
    let currentState = 'open';
    let restartStatus = 200;

    globalThis.fetch = async (url: any, init?: any) => {
      const u = String(url);
      if (u.includes('/instance/connectionState/')) {
        return new Response(JSON.stringify({ instance: { state: currentState } }), { status: 200 });
      }
      if (u.includes('/instance/restart/')) {
        return new Response('', { status: restartStatus });
      }
      return new Response('', { status: 404 });
    };

    // Primer muestreo: open
    await (MaintenanceService as any).performEvolutionHealthCheck();
    // Segundo muestreo: closed (debe disparar transición)
    currentState = 'closed';
    await (MaintenanceService as any).performEvolutionHealthCheck();

    const stats = JSON.parse(Metrics.render('json'));
    const lg = stats.labeledGauges || {};
    const lc = stats.labeledCounters || {};

    expect(lg.evolution_instance_state['instance="inst",state="closed"']).toBe(1);
    expect(lg.evolution_instance_state['instance="inst",state="open"']).toBe(0);
    expect(typeof lg.evolution_instance_last_state_change_ts['instance="inst"']).toBe('number');
    expect(lc.evolution_instance_state_changes_total['instance="inst"']).toBe(1);
  });

  it('no incrementa cambios si el estado se repite (open → open)', async () => {
    let currentState = 'open';

    globalThis.fetch = async (url: any, init?: any) => {
      const u = String(url);
      if (u.includes('/instance/connectionState/')) {
        return new Response(JSON.stringify({ instance: { state: currentState } }), { status: 200 });
      }
      if (u.includes('/instance/restart/')) {
        return new Response('', { status: 200 });
      }
      return new Response('', { status: 404 });
    };

    await (MaintenanceService as any).performEvolutionHealthCheck();
    await (MaintenanceService as any).performEvolutionHealthCheck();

    const stats = JSON.parse(Metrics.render('json'));
    const lg = stats.labeledGauges || {};
    const lc = stats.labeledCounters || {};
    expect(lg.evolution_instance_state['instance="inst",state="open"']).toBe(1);
    const changes = lc.evolution_instance_state_changes_total;
    expect(!changes || Object.values(changes).reduce((a: number, b: any) => a + Number(b || 0), 0) === 0).toBe(true);
  });

  it('registra error y marca estado "unreachable" ante HTTP no OK', async () => {
    globalThis.fetch = async (url: any, init?: any) => {
      const u = String(url);
      if (u.includes('/instance/connectionState/')) {
        return new Response('err', { status: 500 });
      }
      return new Response('', { status: 404 });
    };

    await (MaintenanceService as any).performEvolutionHealthCheck();

    const stats = JSON.parse(Metrics.render('json'));
    const lg = stats.labeledGauges || {};
    const lc = stats.labeledCounters || {};
    expect(lg.evolution_instance_state['instance="inst",state="unreachable"']).toBe(1);
    expect(lc.evolution_health_check_errors_total['instance="inst"']).toBe(1);
  });

  it('incrementa attempts y success al reiniciar cuando el estado no es open', async () => {
    let currentState = 'closed';
    let restartStatus = 200;

    globalThis.fetch = async (url: any, init?: any) => {
      const u = String(url);
      if (u.includes('/instance/connectionState/')) {
        return new Response(JSON.stringify({ instance: { state: currentState } }), { status: 200 });
      }
      if (u.includes('/instance/restart/')) {
        return new Response('', { status: restartStatus });
      }
      return new Response('', { status: 404 });
    };

    await (MaintenanceService as any).performEvolutionHealthCheck();

    const stats = JSON.parse(Metrics.render('json'));
    const lc = stats.labeledCounters || {};
    expect(lc.evolution_instance_restart_attempts_total['instance="inst"']).toBe(1);
    expect(lc.evolution_instance_restart_success_total['instance="inst"']).toBe(1);
  });

  it('no incrementa success si el reinicio falla', async () => {
    let currentState = 'closed';
    let restartStatus = 500;

    globalThis.fetch = async (url: any, init?: any) => {
      const u = String(url);
      if (u.includes('/instance/connectionState/')) {
        return new Response(JSON.stringify({ instance: { state: currentState } }), { status: 200 });
      }
      if (u.includes('/instance/restart/')) {
        return new Response('', { status: restartStatus });
      }
      return new Response('', { status: 404 });
    };

    await (MaintenanceService as any).performEvolutionHealthCheck();

    const stats = JSON.parse(Metrics.render('json'));
    const lc = stats.labeledCounters || {};
    expect(lc.evolution_instance_restart_attempts_total['instance="inst"']).toBe(1);
    expect(!lc.evolution_instance_restart_success_total || lc.evolution_instance_restart_success_total['instance="inst"'] == null).toBe(true);
  });
});