// Copyright (c) The Perspex Project. All rights reserved.
// Licensed under the MIT license. See licence.md file in the project root for full license information.

using System;
using Perspex.Data;

namespace Perspex
{
    /// <summary>
    /// Interface for getting/setting <see cref="PerspexProperty"/> values on an object.
    /// </summary>
    public interface IPerspexObject
    {
        /// <summary>
        /// Raised when a <see cref="PerspexProperty"/> value changes on this object.
        /// </summary>
        event EventHandler<PerspexPropertyChangedEventArgs> PropertyChanged;

        /// <summary>
        /// Gets a <see cref="PerspexProperty"/> value.
        /// </summary>
        /// <param name="property">The property.</param>
        /// <returns>The value.</returns>
        object GetValue(PerspexProperty property);

        /// <summary>
        /// Gets a <see cref="PerspexProperty"/> value.
        /// </summary>
        /// <typeparam name="T">The type of the property.</typeparam>
        /// <param name="property">The property.</param>
        /// <returns>The value.</returns>
        T GetValue<T>(PerspexProperty<T> property);

        /// <summary>
        /// Checks whether a <see cref="PerspexProperty"/> is set on this object.
        /// </summary>
        /// <param name="property">The property.</param>
        /// <returns>True if the property is set, otherwise false.</returns>
        bool IsSet(PerspexProperty property);

        /// <summary>
        /// Sets a <see cref="PerspexProperty"/> value.
        /// </summary>
        /// <param name="property">The property.</param>
        /// <param name="value">The value.</param>
        /// <param name="priority">The priority of the value.</param>
        void SetValue(
            PerspexProperty property, 
            object value, 
            BindingPriority priority = BindingPriority.LocalValue);

        /// <summary>
        /// Sets a <see cref="PerspexProperty"/> value.
        /// </summary>
        /// <typeparam name="T">The type of the property.</typeparam>
        /// <param name="property">The property.</param>
        /// <param name="value">The value.</param>
        /// <param name="priority">The priority of the value.</param>
        void SetValue<T>(
            PerspexProperty<T> property,
            T value,
            BindingPriority priority = BindingPriority.LocalValue);

        /// <summary>
        /// Binds a <see cref="PerspexProperty"/> to an observable.
        /// </summary>
        /// <param name="property">The property.</param>
        /// <param name="source">The observable.</param>
        /// <param name="priority">The priority of the binding.</param>
        /// <param name="validation">The validation methods of the binding.</param>
        /// <returns>
        /// A disposable which can be used to terminate the binding.
        /// </returns>
        IDisposable Bind(
            PerspexProperty property,
            IObservable<object> source,
            BindingPriority priority = BindingPriority.LocalValue,
            ValidationMethods validation = ValidationMethods.None);

        /// <summary>
        /// Binds a <see cref="PerspexProperty"/> to an observable.
        /// </summary>
        /// <typeparam name="T">The type of the property.</typeparam>
        /// <param name="property">The property.</param>
        /// <param name="source">The observable.</param>
        /// <param name="priority">The priority of the binding.</param>
        /// <param name="validation">The validation methods of the binding.</param>
        /// <returns>
        /// A disposable which can be used to terminate the binding.
        /// </returns>
        IDisposable Bind<T>(
            PerspexProperty<T> property,
            IObservable<T> source,
            BindingPriority priority = BindingPriority.LocalValue,
            ValidationMethods validation = ValidationMethods.None);
    }
}