using NUnit.Framework;

namespace TDD.UnitTestingIntro {

    [TestFixture]
    public class PhoneUtilsTest {

        private PhoneUtils pu;
        private string expected;

        [SetUp]
        protected void SetUp() {
            pu = new PhoneUtils();
            expected = "96085551212";   // canonical format phone number
        }

        [Test, Category("Good Inputs")]
        public void ValidatePhoneNum_IdentityTest() {
            string input = "96085551212";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo(expected), "Identity test failed");
        }

        [Test, Category("Good Inputs")]
        public void ValidatePhoneNum_ValidNumberWithHyphens() {
            string input = "9-608-555-1212";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo(expected), "Number with hyphens failed");
        }

        [Test, Category("Good Inputs")]
        public void ValidatePhoneNum_ValidNumberWithCommaSpace() {
            string input = "9, 608-555-1212";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo(expected), "Number with comma, space & hyphens failed");
        }

        [Test, Category("Good Inputs")]
        public void ValidatePhoneNum_ValidNumberWithParens() {
            string input = "9 (608) 555-1212";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo(expected), "Number with spaces, parens & hyphens failed");
        }

        [Test, Category("Bad Inputs")]
        public void ValidatePhoneNum_Null_ReturnsInvalid() {
            string input = null;
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo("invalid"), "Null number should be invalid");
        }

        [Test, Category("Bad Inputs")]
        public void ValidatePhoneNum_NoLeading9_ReturnsInvalid() {
            string input = "8-608-555-1212";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo("invalid"), "Number not starting '9' should be invalid");
        }

        [Test, Category("Bad Inputs")]
        public void ValidatePhoneNum_TooFewDigits_ReturnsInvalid() {
            string input = "9-608-555-121";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo("invalid"), "Number with 10 digits should be invalid");
        }

        // [Ignore]
        [Test, Category("Bad Inputs")]
        public void ValidatePhoneNum_TooFewDigitsVariant_ReturnsInvalid() {
            string input = "9-60-555-1212";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo("invalid"), "Number with 10 digits should be invalid");
        }

        [Test, Category("Bad Inputs")]
        public void ValidatePhoneNum_TooManyDigits_ReturnsInvalid() {
            string input = "9 608 5555 1212";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo("invalid"), "Number with 12 digits should be invalid");
        }

        [Test, Category("Bad Inputs")]
        public void ValidatePhoneNum_WithOhNotZero_ReturnsInvalid() {
            string input = "9 6O8 5555 121";
            string computed = pu.ValidatePhoneNum(input);
            Assert.That(computed, Is.EqualTo("invalid"), "Number with alphabetics should be invalid");
        }
    }
}