using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace sharpcomparer.controls
{
    public partial class ComparisonPanel : UserControl
    {
        private int leftScroll;
        private int rightScroll;
        private bool isSynced;

        public ComparisonPanel()
        {
            InitializeComponent();

            splitContainer.SplitterDistance = (splitContainer.Width - splitContainer.SplitterWidth) / 2;

            isSynced = true;

            this.Dock = DockStyle.Fill;
        }

        public DataGridView LeftGrid
        {
            get
            {
                return leftDataGridView;
            }
        }

        public DataGridView RightGrid
        {
            get
            {
                return rightDataGridView;
            }
        }

        private void leftDataGridView_Scroll(object sender, ScrollEventArgs e)
        {
            if (isSynced == false) { return; }

            if (sender == leftDataGridView && e.ScrollOrientation == ScrollOrientation.VerticalScroll)
            {
                leftScroll = leftDataGridView.FirstDisplayedScrollingRowIndex;
                rightDataGridView_Scroll(
                    leftDataGridView,
                    new ScrollEventArgs(ScrollEventType.ThumbPosition, e.NewValue, ScrollOrientation.VerticalScroll)
                );
            }

            if (sender == rightDataGridView && e.ScrollOrientation == ScrollOrientation.VerticalScroll)
            {
                leftDataGridView.FirstDisplayedScrollingRowIndex = rightScroll;
            }
        }

        private void rightDataGridView_Scroll(object sender, ScrollEventArgs e)
        {
            if (isSynced == false) { return; }

            if (sender == rightDataGridView && e.ScrollOrientation == ScrollOrientation.VerticalScroll)
            {
                rightScroll = rightDataGridView.FirstDisplayedScrollingRowIndex;
                leftDataGridView_Scroll(
                    rightDataGridView,
                    new ScrollEventArgs(ScrollEventType.ThumbPosition, e.NewValue, ScrollOrientation.VerticalScroll)
                );
            }

            if (sender == leftDataGridView && e.ScrollOrientation == ScrollOrientation.VerticalScroll)
            {
                rightDataGridView.FirstDisplayedScrollingRowIndex = leftScroll;
            }
        }

        private void leftDataGridView_DataSourceChanged(object sender, EventArgs e)
        {
            foreach (DataGridViewRow row in leftDataGridView.Rows)
            {
                string status = row.Cells["Status"].Value != DBNull.Value ? (string)row.Cells["Status"].Value : string.Empty;

                if (status == "RightOnly")
                {
                    row.DefaultCellStyle.BackColor = Color.Silver;
                }
                else if (status == "Different")
                {
                    row.DefaultCellStyle.BackColor = Color.Gold;
                }
            }
            if (leftDataGridView.Columns.Contains("Status"))
            {
                leftDataGridView.Columns.Remove("Status");
            }

            leftDataGridView.ClearSelection();
        }

        private void rightDataGridView_DataSourceChanged(object sender, EventArgs e)
        {
            foreach (DataGridViewRow row in rightDataGridView.Rows)
            {
                string status = row.Cells["Status"].Value != DBNull.Value ? (string)row.Cells["Status"].Value : string.Empty;

                if (status == "LeftOnly")
                {
                    row.DefaultCellStyle.BackColor = Color.Silver;
                }
                else if (status == "Different")
                {
                    row.DefaultCellStyle.BackColor = Color.Gold;
                }
            }
            if (rightDataGridView.Columns.Contains("Status"))
            {
                rightDataGridView.Columns.Remove("Status");
            }

            rightDataGridView.ClearSelection();
        }
    }
}