// Copyright (c) The Geekeey Authors
// SPDX-License-Identifier: EUPL-1.2

using System.Text.RegularExpressions;

namespace Geekeey.Request.Validation.Tests;

internal sealed class RuleBuilderExtensionsTests
{
	[Test]
	public async Task I_can_validate_not_null_for_reference_types()
	{
		var validator = new PropertyValidator<ReferenceValueModel, object?>(model =>
			model.Value, rule => rule.NotNull());

		var invalid = validator.Validate(new ReferenceValueModel());
		var valid = validator.Validate(new ReferenceValueModel { Value = new object() });

		await AssertSingleProblem(invalid, nameof(ReferenceValueModel.Value), "Value is required.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_not_null_for_nullable_value_types()
	{
		var validator = new PropertyValidator<NullableIntValueModel, int?>(model =>
			model.Value, rule => rule.NotNull());

		var invalid = validator.Validate(new NullableIntValueModel());
		var valid = validator.Validate(new NullableIntValueModel { Value = 1 });

		await AssertSingleProblem(invalid, nameof(NullableIntValueModel.Value), "Value is required.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_not_empty_for_strings()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model =>
			model.Value, rule => rule.NotEmpty());

		var invalid = validator.Validate(new StringValueModel { Value = " " });
		var valid = validator.Validate(new StringValueModel { Value = "abc" });

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value is required.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_not_empty_for_collections()
	{
		var validator = new PropertyValidator<CollectionValueModel, IEnumerable<string>?>(model =>
			model.Value, rule => rule.NotEmpty());

		var invalid = validator.Validate(new CollectionValueModel { Value = [] });
		var valid = validator.Validate(new CollectionValueModel { Value = ["item"] });

		await AssertSingleProblem(invalid, nameof(CollectionValueModel.Value), "Value is required.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_min_length()
	{
		var validator =
			new PropertyValidator<StringValueModel, string?>(model =>
				model.Value, rule => rule.MinLength(3));

		var invalid = validator.Validate(new StringValueModel { Value = "ab" });
		var valid = validator.Validate(new StringValueModel { Value = "abc" });
		var ignoredNull = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value must be at least 3 characters long.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(ignoredNull.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_max_length()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.MaxLength(5));

		var invalid = validator.Validate(new StringValueModel { Value = "abcdef" });
		var valid = validator.Validate(new StringValueModel { Value = "abcde" });
		var ignoredNull = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value must be at most 5 characters long.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(ignoredNull.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_length()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.Length(2, 4));

		var invalid = validator.Validate(new StringValueModel { Value = "a" });
		var valid = validator.Validate(new StringValueModel { Value = "ab" });
		var ignoredNull = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value),
			"Value must be between 2 and 4 characters long.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(ignoredNull.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_greater_than()
	{
		var validator = new PropertyValidator<IntValueModel, int>(model
			=> model.Value, rule => rule.GreaterThan(18));

		var invalid = validator.Validate(new IntValueModel { Value = 18 });
		var valid = validator.Validate(new IntValueModel { Value = 19 });

		await AssertSingleProblem(invalid, nameof(IntValueModel.Value), "Value must be greater than 18.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_greater_than_or_equal_to()
	{
		var validator = new PropertyValidator<IntValueModel, int>(model
			=> model.Value, rule => rule.GreaterThanOrEqualTo(1));

		var invalid = validator.Validate(new IntValueModel { Value = 0 });
		var valid = validator.Validate(new IntValueModel { Value = 1 });

		await AssertSingleProblem(invalid, nameof(IntValueModel.Value), "Value must be greater than or equal to 1.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_less_than()
	{
		var validator = new PropertyValidator<IntValueModel, int>(model
			=> model.Value, rule => rule.LessThan(10));

		var invalid = validator.Validate(new IntValueModel { Value = 10 });
		var valid = validator.Validate(new IntValueModel { Value = 9 });

		await AssertSingleProblem(invalid, nameof(IntValueModel.Value), "Value must be less than 10.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_less_than_or_equal_to()
	{
		var validator = new PropertyValidator<IntValueModel, int>(model
			=> model.Value, rule => rule.LessThanOrEqualTo(5));

		var invalid = validator.Validate(new IntValueModel { Value = 6 });
		var valid = validator.Validate(new IntValueModel { Value = 5 });

		await AssertSingleProblem(invalid, nameof(IntValueModel.Value), "Value must be less than or equal to 5.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_between()
	{
		var validator = new PropertyValidator<IntValueModel, int>(model
			=> model.Value, rule => rule.Between(0, 100));

		var invalid = validator.Validate(new IntValueModel { Value = 101 });
		var valid = validator.Validate(new IntValueModel { Value = 100 });

		await AssertSingleProblem(invalid, nameof(IntValueModel.Value), "Value must be between 0 and 100.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_equal()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.Equal("ACTIVE"));

		var invalid = validator.Validate(new StringValueModel { Value = "INACTIVE" });
		var valid = validator.Validate(new StringValueModel { Value = "ACTIVE" });

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value must be equal to ACTIVE.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_not_equal()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.NotEqual("BANNED"));

		var invalid = validator.Validate(new StringValueModel { Value = "BANNED" });
		var valid = validator.Validate(new StringValueModel { Value = "ALLOWED" });

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value must not be equal to BANNED.");
		await Assert.That(valid.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_equal_with_null_reference_values()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.Equal("ACTIVE"));

		var invalid = validator.Validate(new StringValueModel { Value = "INACTIVE" });
		var valid = validator.Validate(new StringValueModel { Value = "ACTIVE" });
		var nullValue = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value must be equal to ACTIVE.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(nullValue.IsValid).IsFalse();
	}

	[Test]
	public async Task I_can_validate_not_equal_with_null_reference_values()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.NotEqual("BANNED"));

		var invalid = validator.Validate(new StringValueModel { Value = "BANNED" });
		var valid = validator.Validate(new StringValueModel { Value = "ALLOWED" });
		var nullValue = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value must not be equal to BANNED.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(nullValue.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_skip_null_values_for_reference_greater_than()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.GreaterThan("B"));

		var invalid = validator.Validate(new StringValueModel { Value = "A" });
		var valid = validator.Validate(new StringValueModel { Value = "C" });
		var ignoredNull = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value must be greater than B.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(ignoredNull.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_skip_null_values_for_reference_between()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.Between("A", "C"));

		var invalid = validator.Validate(new StringValueModel { Value = "D" });
		var valid = validator.Validate(new StringValueModel { Value = "C" });
		var ignoredNull = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value must be between A and C.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(ignoredNull.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_matches_with_a_pattern()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.Matches("^[A-Z]+$"));

		var invalid = validator.Validate(new StringValueModel { Value = "Abc" });
		var valid = validator.Validate(new StringValueModel { Value = "ABC" });
		var ignoredNull = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value is not in the correct format.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(ignoredNull.IsValid).IsTrue();
	}

	[Test]
	public async Task I_can_validate_matches_with_a_regex()
	{
		var validator = new PropertyValidator<StringValueModel, string?>(model
			=> model.Value, rule => rule.Matches(new Regex(@"^\d{4}$", RegexOptions.CultureInvariant)));

		var invalid = validator.Validate(new StringValueModel { Value = "12AB" });
		var valid = validator.Validate(new StringValueModel { Value = "1234" });
		var ignoredNull = validator.Validate(new StringValueModel());

		await AssertSingleProblem(invalid, nameof(StringValueModel.Value), "Value is not in the correct format.");
		await Assert.That(valid.IsValid).IsTrue();
		await Assert.That(ignoredNull.IsValid).IsTrue();
	}

	[Test]
	public async Task I_see_it_throw_for_invalid_length_configuration()
	{
		await Assert.That(() => new PropertyValidator<StringValueModel, string?>(model
				=> model.Value, rule => rule.Length(5, 4)))
			.Throws<ArgumentOutOfRangeException>();
	}

	[Test]
	public async Task I_see_it_throw_for_negative_min_length_configuration()
	{
		await Assert.That(() => new PropertyValidator<StringValueModel, string?>(model
				=> model.Value, rule => rule.MinLength(-1)))
			.Throws<ArgumentOutOfRangeException>();
	}

	[Test]
	public async Task I_see_it_throw_for_invalid_between_configuration()
	{
		await Assert.That(() => new PropertyValidator<IntValueModel, int>(model
				=> model.Value, rule => rule.Between(10, 0)))
			.Throws<ArgumentOutOfRangeException>();
	}

	private static async Task AssertSingleProblem(Validation validation, string propertyPath, string message)
	{
		await Assert.That(validation.Problems).Count().IsEqualTo(1);

		var problem = validation.Problems.Single();

		using (Assert.Multiple())
		{
			await Assert.That(problem.PropertyPath).IsEqualTo(propertyPath);
			await Assert.That(problem.Message).IsEqualTo(message);
		}
	}
}