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.Page;

namespace FastReport.Forms
{
    internal partial class GroupExpertForm : BaseDialogForm
    {
        private Designer designer;
        private Report report;
        private ReportPage page;

        private void FillGroups(GroupHeaderBand group)
        {
            if (group == null)
                return;
            lbGroups.Items.Add(group);
            FillGroups(group.NestedGroup);
        }

        private void UpdateButtonsState()
        {
            int itemIndex = lbGroups.SelectedIndex;
            btnEdit.Enabled = itemIndex != -1;
            btnDelete.Enabled = itemIndex != -1;
            btnUp.Enabled = itemIndex > 0;
            btnDown.Enabled = itemIndex >= 0 && itemIndex < lbGroups.Items.Count - 1;
        }

        private void lbGroups_DrawItem(object sender, DrawItemEventArgs e)
        {
            e.DrawBackground();
            if (e.Index >= 0)
            {
                GroupHeaderBand c = lbGroups.Items[e.Index] as GroupHeaderBand;
                this.DrawImageAndText(e, GetImage(RegisteredObjects.FindObject(c).ImageIndex), c.GetInfoText());
            }       
            
            /*e.Graphics.FillRectangle((e.State & DrawItemState.Selected) != 0 ? SystemBrushes.Highlight : SystemBrushes.Window,
              new Rectangle(e.Bounds.X + 22, e.Bounds.Y, e.Bounds.Width - 22, e.Bounds.Height));

            if (e.Index < 0)
                return;
            GroupHeaderBand c = lbGroups.Items[e.Index] as GroupHeaderBand;
            Image img = RegisteredObjects.FindObject(c).Image;
            e.Graphics.DrawImage(img, e.Bounds.X + 2, e.Bounds.Y);
            TextRenderer.DrawText(e.Graphics, c.GetInfoText(), e.Font,
              new Point(e.Bounds.X + 24, e.Bounds.Y + (e.Bounds.Height - lbGroups.ItemHeight) / 2), e.ForeColor);*/
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            if (String.IsNullOrEmpty(cbxDataColumn.Text))
                return;

            GroupHeaderBand group = new GroupHeaderBand();
            group.Condition = cbxDataColumn.Text;
            group.SetReport(report);

            lbGroups.Items.Add(group);
            lbGroups.SelectedItem = group;
        }

        private void lbGroups_SelectedIndexChanged(object sender, EventArgs e)
        {
            UpdateButtonsState();
        }

        private void btnEdit_Click(object sender, EventArgs e)
        {
            GroupHeaderBand group = lbGroups.SelectedItem as GroupHeaderBand;
            group.InvokeEditor();
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            int index = lbGroups.SelectedIndex;
            lbGroups.Items.RemoveAt(index);
            if (index >= lbGroups.Items.Count)
                index--;
            if (index < 0)
                index = 0;
            if (index < lbGroups.Items.Count)
                lbGroups.SelectedIndex = index;
        }

        private void btnUp_Click(object sender, EventArgs e)
        {
            object item = lbGroups.SelectedItem;
            int index = lbGroups.SelectedIndex;
            lbGroups.Items.Remove(item);
            lbGroups.Items.Insert(index - 1, item);
            lbGroups.SelectedItem = item;
        }

        private void btnDown_Click(object sender, EventArgs e)
        {
            object item = lbGroups.SelectedItem;
            int index = lbGroups.SelectedIndex;
            lbGroups.Items.Remove(item);
            lbGroups.Items.Insert(index + 1, item);
            lbGroups.SelectedItem = item;
        }

        private void GroupExpertForm_Shown(object sender, EventArgs e)
        {
            lblHint.Width = gbGroupCondition.Width - lblHint.Left * 2;
            lbGroups.Height = gbGroups.Height - lbGroups.Top - 12;
        }

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

        private void Init()
        {
            cbxDataColumn.Report = report;

            // fill existing groups
            foreach (BandBase band in page.Bands)
            {
                if (band is GroupHeaderBand)
                {
                    FillGroups(band as GroupHeaderBand);
                    break;
                }
            }

            UpdateButtonsState();
        }

        private void Done()
        {
            if (DialogResult == DialogResult.OK)
            {
                float defaultHeight = Units.Millimeters * 10;
                if (ReportWorkspace.Grid.GridUnits == PageUnits.Inches ||
                  ReportWorkspace.Grid.GridUnits == PageUnits.HundrethsOfInch)
                    defaultHeight = Units.Inches * 0.4f;

                GroupHeaderBand initialGroup = null;
                DataBand data = null;
                int childIndex = -1;
                foreach (BandBase band in page.Bands)
                {
                    if (band is GroupHeaderBand)
                    {
                        childIndex = band.ZOrder;
                        initialGroup = band as GroupHeaderBand;
                        data = (band as GroupHeaderBand).GroupDataBand;
                        break;
                    }
                    else if (band is DataBand)
                    {
                        childIndex = band.ZOrder;
                        data = band as DataBand;
                        break;
                    }
                }

                // report has no groups nor databands, create a databand
                if (childIndex == -1)
                {
                    data = new DataBand();
                    data.Height = defaultHeight;
                    childIndex = 0;
                }

                // connect groups to each other
                data.Parent = null;
                Base parent = null;
                for (int i = 0; i < lbGroups.Items.Count; i++)
                {
                    GroupHeaderBand group = lbGroups.Items[i] as GroupHeaderBand;
                    group.Parent = parent;
                    group.Data = i < lbGroups.Items.Count - 1 ? null : data;
                    parent = group;
                }

                // insert a group to the report page
                if (lbGroups.Items.Count > 0)
                {
                    GroupHeaderBand firstGroup = lbGroups.Items[0] as GroupHeaderBand;
                    page.Bands.Insert(childIndex, firstGroup);

                    // create unique names
                    if (String.IsNullOrEmpty(firstGroup.GroupDataBand.Name))
                        firstGroup.GroupDataBand.CreateUniqueName();
                    for (int i = 0; i < lbGroups.Items.Count; i++)
                    {
                        GroupHeaderBand group = lbGroups.Items[i] as GroupHeaderBand;
                        if (String.IsNullOrEmpty(group.Name))
                        {
                            group.Height = defaultHeight;
                            group.CreateUniqueName();

                            // create text object with group name
                            TextObject text = new TextObject();
                            text.Parent = group;
                            text.CreateUniqueName();
                            text.Bounds = new RectangleF(new PointF(0, 0), text.GetPreferredSize());
                            text.Text = "[" + group.Condition + "]";

                            // create group footer
                            group.GroupFooter = new GroupFooterBand();
                            group.GroupFooter.Height = defaultHeight;
                            group.GroupFooter.CreateUniqueName();
                        }
                    }
                }
                else
                {
                    if (!String.IsNullOrEmpty(data.Name))
                        page.Bands.Insert(childIndex, data);
                }

                // delete initial group if it was deleted in the expert
                if (initialGroup != null && !lbGroups.Items.Contains(initialGroup))
                    initialGroup.Dispose();
            }
        }

        public override void Localize()
        {
            base.Localize();
            MyRes res = new MyRes("Forms,GroupExpert");
            Text = res.Get("");
            gbGroupCondition.Text = res.Get("Condition");
            lblHint.Text = res.Get("Hint");
            btnAdd.Text = res.Get("Add");
            gbGroups.Text = res.Get("Groups");
            btnEdit.Text = res.Get("Edit");
            btnDelete.Text = res.Get("Delete");
        }

        public override void UpdateDpiDependencies()
        {
            base.UpdateDpiDependencies();
            btnUp.Image = GetImage(208);
            btnDown.Image = GetImage(209);
            lbGroups.ItemHeight = this.LogicalToDevice(17);
        }

        public GroupExpertForm(Designer designer)
        {
            this.designer = designer;
            report = designer.ActiveReport;
            page = designer.ActiveReportTab.ActivePage as ReportPage;
            InitializeComponent();
            Init();
            Localize();
            UIUtils.CheckRTL(this);
            UpdateDpiDependencies();
        }
    }
}