using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using FastReport.Utils;
using FastReport.Design;
using FastReport.Design.PageDesigners.Code;
#if !MONO
using FastReport.Editor;
#endif

namespace FastReport.Forms
{
    internal partial class SearchReplaceForm : BaseDialogForm
    {
        private Designer designer;
        private bool replace;
        private bool firstSearch;
        private int index;

        private static string[] FLastSearch;
        private static string[] FLastReplace;
        private static bool FMatchCase;
        private static bool FMatchWholeWord;

        public bool Replace
        {
            get { return replace; }
            set
            {
                replace = value;

                pnReplace.Visible = value;
                pnReplaceButton.Visible = value;
                PerformLayout();
                ClientSize = new Size(gbOptions.Right + gbOptions.Left, (value ? pnReplaceButton.Bottom : pnFindButton.Bottom) + 4);
            }
        }

        private List<CharacterRange> FindText(string text, int startIndex)
        {
            string textToFind = cbxFind.Text;
            bool matchCase = cbMatchCase.Checked;
            bool wholeWord = cbMatchWholeWord.Checked;

            List<CharacterRange> ranges = new List<CharacterRange>();
            string nonWordChars = " `-=[];',./~!@#$%^&*()+{}:\"<>?\\|";

            while (startIndex < text.Length)
            {
                int i = text.IndexOf(textToFind, startIndex, matchCase ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase);
                if (i >= 0)
                {
                    bool skip = false;
                    if (wholeWord)
                    {
                        if (i > 0 && nonWordChars.IndexOf(text[i - 1]) != -1)
                            skip = true;
                        if (i < text.Length - 1 && nonWordChars.IndexOf(text[i + 1]) != -1)
                            skip = true;
                    }
                    if (!skip)
                        ranges.Add(new CharacterRange(i, textToFind.Length));
                    startIndex = i + textToFind.Length;
                }
                else
                    break;
            }

            return ranges;
        }

        private void FindNext(bool replace, bool replaceAll)
        {
            bool found = false;

            if (designer.ActiveReportTab.ActivePage == null)
            {
#if !MONO
                // search in the code tab
                SyntaxEdit Edit = (designer.ActiveReportTab.ActivePageDesigner as CodePageDesigner).Edit;
                if (firstSearch)
                    Edit.FirstSearch = true;

                SearchOptions options = SearchOptions.None;
                if (cbMatchCase.Checked)
                    options |= SearchOptions.CaseSensitive;
                if (cbMatchWholeWord.Checked)
                    options |= SearchOptions.WholeWordsOnly;

                if (Edit.Selection.SelectedText == cbxFind.Text && replace && !replaceAll)
                {
                    Edit.Selection.SelectedText = cbxReplace.Text;
                    found = true;
                }
                else
                {
                    while (true)
                    {
                        if (Edit.Find(cbxFind.Text, options))
                        {
                            found = true;

                            if (replace)
                                Edit.Selection.SelectedText = cbxReplace.Text;

                            if (!replaceAll)
                                break;
                        }
                        else
                            break;
                    }
                }
#endif
            }
            else
            {
                ObjectCollection allObjects = designer.ActiveReportTab.ActivePage.AllObjects;
                for (; index < allObjects.Count; index++)
                {
                    Base c = allObjects[index];
                    string text = "";
                    if (c is TextObject)
                        text = (c as TextObject).Text;
                    else if (c is RichObject)
                        text = (c as RichObject).Text;

                    List<CharacterRange> ranges = FindText(text, 0);
                    if (ranges.Count > 0)
                    {
                        found = true;

                        if (!replaceAll)
                        {
                            designer.SelectedObjects.Clear();
                            designer.SelectedObjects.Add(c);
                            designer.SelectionChanged(null);
                        }

                        if (replace)
                        {
                            int correction = 0;
                            foreach (CharacterRange range in ranges)
                            {
                                text = text.Remove(range.First + correction, range.Length);
                                text = text.Insert(range.First + correction, cbxReplace.Text);
                                correction += cbxReplace.Text.Length - range.Length;
                            }

                            if (c is TextObject)
                                (c as TextObject).Text = text;
                            else if (c is RichObject)
                                (c as RichObject).Text = text;
                        }

                        if (!replaceAll)
                        {
                            index++;
                            break;
                        }
                    }
                }
            }

            if (found && replace)
                designer.SetModified(null, "Change");

            if (firstSearch)
            {
                if (!found)
                    FRMessageBox.Information(Res.Get("Forms,SearchReplace,NotFound"));
                firstSearch = false;
            }
            else
            {
                if (!found)
                    FRMessageBox.Information(Res.Get("Forms,SearchReplace,NoMoreFound"));
            }
        }

        private void cbxFind_TextChanged(object sender, EventArgs e)
        {
            bool enabled = !String.IsNullOrEmpty(cbxFind.Text);
            btnFindNext.Enabled = enabled;
            btnReplace.Enabled = enabled;
            btnReplaceAll.Enabled = enabled;
        }

        private void btnFindNext_Click(object sender, EventArgs e)
        {
            FindNext(false, false);
        }

        private void btnReplace_Click(object sender, EventArgs e)
        {
            FindNext(true, false);
        }

        private void btnReplaceAll_Click(object sender, EventArgs e)
        {
            FindNext(true, true);
        }

        private void SearchReplaceForm_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyData == Keys.Escape)
                Close();
        }

        private void SearchReplaceForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            Done();
        }

        private void Init()
        {
            if (FLastSearch != null)
            {
                foreach (string s in FLastSearch)
                {
                    cbxFind.Items.Add(s);
                }
            }
            if (FLastReplace != null)
            {
                foreach (string s in FLastReplace)
                {
                    cbxReplace.Items.Add(s);
                }
            }
            cbMatchCase.Checked = FMatchCase;
            cbMatchWholeWord.Checked = FMatchWholeWord;

            firstSearch = true;
            index = 0;
            cbxFind_TextChanged(this, EventArgs.Empty);
            Config.RestoreFormState(this);
        }

        private void Done()
        {
            List<string> items = new List<string>();
            foreach (object item in cbxFind.Items)
            {
                items.Add(item.ToString());
            }
            if (items.IndexOf(cbxFind.Text) == -1)
                items.Add(cbxFind.Text);
            FLastSearch = items.ToArray();

            foreach (object item in cbxReplace.Items)
            {
                items.Add(item.ToString());
            }
            if (items.IndexOf(cbxReplace.Text) == -1)
                items.Add(cbxReplace.Text);
            FLastReplace = items.ToArray();

            FMatchCase = cbMatchCase.Checked;
            FMatchWholeWord = cbMatchWholeWord.Checked;
            Config.SaveFormState(this);
        }

        public override void Localize()
        {
            base.Localize();
            MyRes res = new MyRes("Forms,SearchReplace");
            Text = res.Get("");

            lblFind.Text = res.Get("Find");
            lblReplace.Text = res.Get("Replace");
            gbOptions.Text = res.Get("Options");
            cbMatchCase.Text = res.Get("MatchCase");
            cbMatchWholeWord.Text = res.Get("MatchWholeWord");
            btnFindNext.Text = res.Get("FindNext");
            btnReplace.Text = res.Get("ReplaceBtn");
            btnReplaceAll.Text = res.Get("ReplaceAll");
        }

        public SearchReplaceForm(Designer designer, bool isReplace)
        {
            this.designer = designer;
            InitializeComponent();
            Localize();
            replace = isReplace;
            Init();
            UIUtils.CheckRTL(this);
        }
    }
}