// Copyright (C) Stichting Deltares 2016. All rights reserved.
//
// This file is part of Ringtoets.
//
// Ringtoets is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using Core.Common.Base;
using Core.Common.Controls.DataGrid;
using Core.Common.Controls.Views;
using Ringtoets.Common.Data.FailureMechanism;
using CoreCommonResources = Core.Common.Base.Properties.Resources;
using CoreCommonControlsResources = Core.Common.Controls.Properties.Resources;

namespace Ringtoets.Common.Forms.Views
{
    /// <summary>
    /// The view for the <see cref="FailureMechanismSectionResult"/>.
    /// </summary>
    public abstract partial class FailureMechanismResultView<T> : UserControl, IView where T : FailureMechanismSectionResult
    {
        private const int assessmentLayerOneColumnIndex = 1;
        private readonly IList<Observer> failureMechanismSectionResultObservers;
        private readonly Observer failureMechanismObserver;

        private IEnumerable<T> failureMechanismSectionResult;
        private IFailureMechanism failureMechanism;

        /// <summary>
        /// Creates a display object for <paramref name="sectionResult"/> which is added to the
        /// <see cref="DataGridView"/> on the <see cref="FailureMechanismResultView{T}"/>.
        /// </summary>
        /// <param name="sectionResult">The <typeparamref name="T"/> for which to create a
        /// display object.</param>
        /// <returns>A display object which can be added as a row to the <see cref="DataGridView"/>.</returns>
        protected abstract object CreateFailureMechanismSectionResultRow(T sectionResult);

        /// <summary>
        /// Creates a new instance of <see cref="FailureMechanismResultView{T}"/>.
        /// </summary>
        protected FailureMechanismResultView()
        {
            InitializeComponent();

            failureMechanismObserver = new Observer(UpdataDataGridViewDataSource);
            failureMechanismSectionResultObservers = new List<Observer>();
        }

        /// <summary>
        /// Sets the failure mechanism.
        /// </summary>
        public virtual IFailureMechanism FailureMechanism
        {
            set
            {
                failureMechanism = value;
                failureMechanismObserver.Observable = failureMechanism;
            }
        }

        public object Data
        {
            get
            {
                return failureMechanismSectionResult;
            }
            set
            {
                FailureMechanismSectionResult = value as IEnumerable<T>;

                if (failureMechanismSectionResult != null)
                {
                    UpdataDataGridViewDataSource();
                }
                else
                {
                    DataGridViewControl.SetDataSource(null);
                }
            }
        }

        protected DataGridViewControl DataGridViewControl { get; private set; }

        protected override void Dispose(bool disposing)
        {
            FailureMechanism = null;
            FailureMechanismSectionResult = null;
            if (failureMechanismObserver != null)
            {
                failureMechanismObserver.Dispose();
            }

            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        /// <summary>
        /// Finds out whether the assessment section which is represented by the row at index 
        /// <paramref name="rowIndex"/> has passed the level 1 assessment.
        /// </summary>
        /// <param name="rowIndex">The index of the row which has a section attached.</param>
        /// <returns><c>false</c> if assessment level 1 has passed, <c>true</c> otherwise.</returns>
        protected bool HasPassedLevelOne(int rowIndex)
        {
            return (bool) DataGridViewControl.GetCell(rowIndex, assessmentLayerOneColumnIndex).Value;
        }

        /// <summary>
        /// Updates the data source of the data grid view with the current known failure mechanism section results.
        /// </summary>
        protected void UpdataDataGridViewDataSource()
        {
            UpdateFailureMechanismSectionResultsObservers();
            DataGridViewControl.EndEdit();
            DataGridViewControl.SetDataSource(failureMechanismSectionResult.Select(CreateFailureMechanismSectionResultRow).ToList());
        }

        /// <summary>
        /// Gets data that is visualized on the row a the given <paramref name="rowIndex"/>.
        /// </summary>
        /// <param name="rowIndex">The position of the row in the data source.</param>
        /// <returns>The data bound to the row at index <paramref name="rowIndex"/>.</returns>
        protected object GetDataAtRow(int rowIndex)
        {
            return DataGridViewControl.GetRowFromIndex(rowIndex).DataBoundItem;
        }

        private IEnumerable<T> FailureMechanismSectionResult
        {
            set
            {
                failureMechanismSectionResult = value;

                UpdateFailureMechanismSectionResultsObservers();
            }
        }

        private void UpdateFailureMechanismSectionResultsObservers()
        {
            ClearSectionResultObservers();
            if (failureMechanismSectionResult != null)
            {
                AddSectionResultObservers();
            }
        }

        private void AddSectionResultObservers()
        {
            foreach (var sectionResult in failureMechanismSectionResult)
            {
                failureMechanismSectionResultObservers.Add(new Observer(DataGridViewControl.RefreshDataGridView)
                {
                    Observable = sectionResult
                });
            }
        }

        private void ClearSectionResultObservers()
        {
            foreach (var observer in failureMechanismSectionResultObservers)
            {
                observer.Dispose();
            }
            failureMechanismSectionResultObservers.Clear();
        }
    }
}