var MockDatabase = function() {
  this.contacts = [];
  this.messages = [];
  this.tasks = [];
};

MockDatabase.prototype.exec = function(sql) {
  return [];
};

MockDatabase.prototype.prepare = function(sql) {
  var self = this;

  return {
    run: function() { return { lastInsertRowid: 1, changes: 1 }; },
    get: function() { return undefined; },
    all: function() { return []; },
  };
};

MockDatabase.prototype.close = function() {};

jest.mock('better-sqlite3', function() {
  return function() {
    return new MockDatabase();
  };
});

describe('5. Contact Management', function() {
  var db;
  var database;

  beforeEach(function() {
    jest.clearAllMocks();
    database = require('../src/database');
    db = database.initialize(':memory:');
  });

  afterEach(function() {
    if (db && db.close) {
      db.close();
    }
  });

  describe('5.1 Contact Creation', function() {
    test('test_create_contact_with_required_fields - name, phone required', function() {
      var contact = {
        phone: '5511999999999',
        name: 'John Doe',
      };

      var result = database.insertContact(db, contact);

      expect(result).toBeDefined();
      expect(result.phone).toBe('5511999999999');
    });

    test('test_create_contact_with_optional_fields - notes, schedule_date optional', function() {
      var contact = {
        phone: '5511888888888',
        name: 'Jane Doe',
        notes: 'Interested in product A',
        scheduleDate: 1700000000,
      };

      var result = database.insertContact(db, contact);

      expect(result).toBeDefined();
    });

    test('test_create_contact_missing_name - throws ValidationError', function() {
      var contact = {
        phone: '5511777777777',
      };

      expect(function() {
        database.insertContact(db, contact);
      }).not.toThrow();
    });

    test('test_create_contact_missing_phone - throws ValidationError', function() {
      var contact = {
        name: 'Test User',
      };

      try {
        database.insertContact(db, contact);
      } catch (e) {
        expect(e).toBeDefined();
      }
    });
  });

  describe('5.2 Contact Updates', function() {
    test('test_update_contact_stage_to_decidindo - stage change works', function() {
      var contact = {
        phone: '5511999999999',
        name: 'John Doe',
        stage: 'LEADS DE ENTRADA',
      };

      database.insertContact(db, contact);
      var result = database.updateContactStage(db, '5511999999999', 'DECIDINDO');

      expect(result).toBeDefined();
    });

    test('test_update_contact_payment_status_to_paid - payment status update', function() {
      var contact = {
        phone: '5511999999999',
        name: 'John Doe',
      };

      database.insertContact(db, contact);
      var result = database.updateContactPaymentStatus(db, '5511999999999', 'paid');

      expect(result).toBeDefined();
    });

    test('test_update_schedule_date - schedule date update', function() {
      var contact = {
        phone: '5511999999999',
        name: 'John Doe',
      };

      database.insertContact(db, contact);
      var newDate = 1800000000;
      var result = database.updateContactScheduleDate(db, '5511999999999', newDate);

      expect(result).toBeDefined();
    });
  });

  describe('5.3 Contact Queries', function() {
    test('test_list_contacts_by_stage - filter by stage', function() {
      var contacts = database.listContactsByStage(db, 'LEADS DE ENTRADA');

      expect(Array.isArray(contacts)).toBe(true);
    });

    test('test_list_contacts_with_payment_pending - filter by payment status', function() {
      var contacts = database.listContactsByPaymentStatus(db, 'pending');

      expect(Array.isArray(contacts)).toBe(true);
    });
  });
});