using System;
using System.Windows.Forms;
using Nullstack.ClearCanvasEx.DevTools.Logging;

namespace Nullstack.ClearCanvasEx.DevTools.View.WinForms
{
    public partial class LogViewerComponentPanel : UserControl
    {
        private readonly LogViewerComponent _component;

        public LogViewerComponentPanel(LogViewerComponent component)
        {
            InitializeComponent();

            _component = component;
            if (_component != null)
            {
                _component.BufferReset += ComponentBufferReset;
                _component.BufferAppended += ComponentBufferAppended;
            }
        }

        private bool Search(string subject, int start, bool reverse, bool caseSensitive)
        {
            if (string.IsNullOrEmpty(subject))
                return false;

            var rangeStart = !reverse ? start : 0;
            var rangeEnd = !reverse ? _logPane.TextLength : start;
            var options = RichTextBoxFinds.None;

            if (rangeStart > _logPane.TextLength || rangeEnd > _logPane.TextLength)
                return false;

            if (caseSensitive)
                options |= RichTextBoxFinds.MatchCase;
            if (reverse)
                options |= RichTextBoxFinds.Reverse;

            return _logPane.Find(subject, rangeStart, rangeEnd, options) >= 0;
        }

        private void ScrollToEnd()
        {
            _logPane.Select(_logPane.TextLength, 0);
            _logPane.ScrollToCaret();
        }

        private void ComponentBufferAppended(object sender, ClearCanvas.Common.Utilities.ItemEventArgs<string> e)
        {
            var s = e.Item;
            _logPane.AppendText(s);
            ScrollToEnd();
        }

        private void ComponentBufferReset(object sender, EventArgs e)
        {
            var s = _component.ReadBuffer();
            _logPane.Text = s;
            ScrollToEnd();
        }

        private void TxtSearchFieldTextChanged(object sender, EventArgs e)
        {
            Search(_txtSearchField.Text, 0, false, _chkSearchCaseSensitive.Checked);
        }

        private void BtnSearchNextClick(object sender, EventArgs e)
        {
            Search(_txtSearchField.Text, _logPane.SelectionStart + 1, false, _chkSearchCaseSensitive.Checked);
        }

        private void BtnSearchPreviousClick(object sender, EventArgs e)
        {
            Search(_txtSearchField.Text, _logPane.SelectionStart, true, _chkSearchCaseSensitive.Checked);
        }

        private void LogPaneKeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyData == Keys.F3 && !string.IsNullOrEmpty(_txtSearchField.Text))
            {
                e.Handled = true;
                e.SuppressKeyPress = true;
                Search(_txtSearchField.Text, _logPane.SelectionStart + 1, false, _chkSearchCaseSensitive.Checked);
            }
            else if (e.KeyData == Keys.F3 || (e.KeyData == (Keys) (Keys.Control | Keys.F)))
            {
                e.Handled = true;
                e.SuppressKeyPress = true;
                _lyoSearchPane.Visible = true;
                _txtSearchField.Focus();
            }
        }

        private void BtnCloseSearchPaneClick(object sender, EventArgs e)
        {
            _lyoSearchPane.Visible = false;
        }
    }
}