#region License
// Copyright (c) .NET Foundation and contributors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// The latest version of this file can be found at https://github.com/FluentValidation/FluentValidation
#endregion

namespace FluentValidation.Validators;

using System;
using System.Collections.Generic;

/// <summary>
/// Base class for range validation.
/// </summary>
public abstract class RangeValidator<T, TProperty> : PropertyValidator<T, TProperty>, IBetweenValidator {

	readonly IComparer<TProperty> _explicitComparer;

	public RangeValidator(TProperty from, TProperty to, IComparer<TProperty> comparer) {
		To = to;
		From = from;

		_explicitComparer = comparer;

		// IComparer<T> only guarantees the sign, not the magnitude.
		if (comparer.Compare(to, from) < 0) {
			throw new ArgumentOutOfRangeException(nameof(to), "To should be larger than from.");
		}
	}

	public TProperty From { get; }
	public TProperty To { get; }

	object IBetweenValidator.From => From;
	object IBetweenValidator.To => To;

	protected abstract bool HasError(TProperty value);

	public override bool IsValid(ValidationContext<T> context, TProperty value) {
		// If the value is null then we abort and assume success.
		// This should not be a failure condition - only a NotNull/NotEmpty should cause a null to fail.
		if (value == null) return true;

		if (HasError(value)) {

			context.MessageFormatter
				.AppendArgument("From", From)
				.AppendArgument("To", To);

			return false;
		}
		return true;
	}

	protected int Compare(TProperty a, TProperty b) {
		return _explicitComparer.Compare(a, b);
	}

	protected override string GetDefaultMessageTemplate(string errorCode) {
		return Localized(errorCode, Name);
	}
}

public static class RangeValidatorFactory {
	public static ExclusiveBetweenValidator<T, TProperty> CreateExclusiveBetween<T,TProperty>(TProperty from, TProperty to)
		where TProperty : IComparable<TProperty>, IComparable =>
		new ExclusiveBetweenValidator<T, TProperty>(from, to, ComparableComparer<TProperty>.Instance);

	public static InclusiveBetweenValidator<T, TProperty> CreateInclusiveBetween<T,TProperty>(TProperty from, TProperty to)
		where TProperty : IComparable<TProperty>, IComparable {
		return new InclusiveBetweenValidator<T, TProperty>(from, to, ComparableComparer<TProperty>.Instance);
	}
}