package com.example

import org.junit.Assert.*
import org.junit.Test

/**
 * Example local unit test, which will execute on the development machine (host).
 *
 * See [testing documentation](http://d.android.com/tools/testing).
 */
class ExampleUnitTest {
  @Test
  fun addition_isCorrect() {
    assertEquals(4, 2 + 2)
  }

  @Test
  fun utrValidator_rejectsEmptyAndWrongLength() {
    assertTrue(com.example.util.UtrValidator.validate("") is com.example.util.UtrValidationResult.Error)
    assertTrue(com.example.util.UtrValidator.validate("12345") is com.example.util.UtrValidationResult.Error)
    assertTrue(com.example.util.UtrValidator.validate("1234567890123") is com.example.util.UtrValidationResult.Error)
    assertTrue(com.example.util.UtrValidator.validate("abcdefghijkl") is com.example.util.UtrValidationResult.Error)
  }

  @Test
  fun utrValidator_rejectsFakeAndDummyPatterns() {
    // All identical digits
    assertTrue(com.example.util.UtrValidator.validate("000000000000") is com.example.util.UtrValidationResult.Error)
    assertTrue(com.example.util.UtrValidator.validate("111111111111") is com.example.util.UtrValidationResult.Error)
    assertTrue(com.example.util.UtrValidator.validate("999999999999") is com.example.util.UtrValidationResult.Error)

    // Sequential fake
    assertTrue(com.example.util.UtrValidator.validate("123456789012") is com.example.util.UtrValidationResult.Error)
    assertTrue(com.example.util.UtrValidator.validate("987654321098") is com.example.util.UtrValidationResult.Error)

    // Low entropy
    assertTrue(com.example.util.UtrValidator.validate("121212121212") is com.example.util.UtrValidationResult.Error)

    // Invalid Julian Day
    assertTrue(com.example.util.UtrValidator.validate("699912345678") is com.example.util.UtrValidationResult.Error)
  }

  @Test
  fun utrValidator_acceptsValidUtr() {
    val validUtr = com.example.util.UtrValidator.generateRealTimeValidUtr()
    assertEquals(12, validUtr.length)
    val result = com.example.util.UtrValidator.validate(validUtr)
    assertTrue("Generated UTR $validUtr should be valid", result is com.example.util.UtrValidationResult.Success)
  }
}