using FastReport.Design;
using FastReport.Dialog;
using FastReport.Utils;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;

namespace FastReport.Forms
{
    /// <summary>
    /// Represents a form for opening and adding pages of another report to the main report.
    /// </summary>
    public partial class OpenPageForm : BaseDialogForm
    {
        /// <summary>
        /// Designer of the main report.
        /// </summary>
        public Designer Designer { get; }

        private List<PageBase> pages = new List<PageBase>();
        private List<int> selectedIndices = new List<int>();

        /// <summary>
        /// Creates a new instance of the form to open the pages of another report
        /// </summary>
        /// <param name="designer">Designer of the main report.</param>
        /// <param name="report">The report from which pages will be added to the main report</param>
        public OpenPageForm(Designer designer, Report report)
        {
            InitializeComponent();
            Localize();
            UIUtils.CheckRTL(this);
            UpdateDpiDependencies();

            Designer = designer;

            foreach (PageBase page in report.Pages)
            {
                pages.Add(page);
            }
        }
        /// <inheritdoc/>
        public override void Localize()
        {
            base.Localize();
            Text = Res.Get("Forms,OpenPage");
        }

        private void btnOk_Click(object sender, EventArgs e)
        {
            if (lbPages.SelectedItems.Count < 1)
                return;

            List<string> richNames = new List<string>();
            foreach (Base item in Designer.Report.AllObjects)
            {
                if (item is RichObject)
                    richNames.Add(item.Name);
            }

            foreach (string page in lbPages.SelectedItems)
            {
                Designer.Report.Pages.Add(pages.Find(x => x.Name == page));
            }

            // select the newly added pages from the list of pages of the main report for renaming (if necessary)
            var addedPages = Designer.Report.Pages.Cast<PageBase>().Skip(Designer.Report.Pages.Count - lbPages.SelectedItems.Count);

            foreach (var page in addedPages)
            {
                if (Designer.Report.Pages.Cast<PageBase>().Where(c => c.Name == page.Name).Count() > 1)
                    page.CreateUniqueName();

                foreach (Base item in page.AllObjects)
                {
                    if (item is RichObject)
                    {
                        item.Report.Designer = Designer;
                        string newName;
                        int i = 1;
                        do
                        {
                            newName = item.BaseName + i.ToString();
                            i++;
                        }
                        while (richNames.Contains(newName));
                        item.Name = newName;
                    }

                    if (Designer.Report.AllObjects.Cast<Base>().Where(c => c.Name == item.Name).Count() > 1)
                        item.CreateUniqueName();
                }
            }

            Designer.SetModified(this, "AddPage");
            Close();
        }

        private void OpenPageForm_Load(object sender, EventArgs e)
        {
            foreach (var item in pages)
            {
                lbPages.Items.Add(item.Name);
            }

            if (lbPages.Items.Count > 0)
                lbPages.SelectedItem = lbPages.Items[0];
        }

        private string GetLastSelectedPageName()
        {
            foreach (int index in lbPages.SelectedIndices)
                if (!selectedIndices.Contains(index))
                    selectedIndices.Add(index);

            foreach (int index in new List<int>(selectedIndices))
                if (!lbPages.SelectedIndices.Contains(index) && selectedIndices.Count > 1)
                    selectedIndices.Remove(index);

            return lbPages.Items[selectedIndices.Last()].ToString();
        }

        private void lbPages_SelectedIndexChanged(object sender, EventArgs e)
        {
            float width, height, resolution = 1;
            Bitmap bitmap = null;

            //string lastPageName = GetLastSelectedPageName();
            string lastPageName = lbPages.SelectedItems.Cast<string>().Last().ToString();

            if (pages.Find(x => x.Name == lastPageName) is ReportPage reportPage)
            {
                // the original height and width of the report page
                float originalPaperHeight = reportPage.PaperHeight;
                float originalPaperWidth = reportPage.PaperWidth;
                // sum the height of all brands - this value will become the height of the page
                float heightBands = 0;

                foreach (var item in reportPage.AllObjects)
                {
                    if (item is BandBase bandItem)
                        heightBands += bandItem.Height;
                }

                reportPage.PaperHeight = heightBands / Units.Millimeters + (reportPage.TopMargin + reportPage.BottomMargin);

                height = reportPage.PaperHeight * Units.Millimeters;
                width = reportPage.PaperWidth * Units.Millimeters;

                if (reportPage.UnlimitedWidth)
                {
                    // if the report objects go beyond the bounds of the page width specified in the properties,
                    // the page width is set to the value of the right edge of the rightmost object
                    foreach (var item in reportPage.AllObjects)
                    {
                        if (item is BandBase bandItem)
                        {
                            foreach (var itemBandItem in bandItem.AllObjects)
                            {
                                if (itemBandItem is ComponentBase reportObject)
                                    if (reportObject.Right > reportPage.PaperWidth * Units.Millimeters)
                                        reportPage.PaperWidth = reportObject.Right / Units.Millimeters;
                            }
                        }
                    }

                    reportPage.PaperWidth += (reportPage.LeftMargin + reportPage.RightMargin);

                    width = reportPage.PaperWidth * Units.Millimeters;

                    //if the page has the UnlimitedWidth = true,
                    //the UnlimitedWidthValue is set to the page width value,
                    //otherwise an exception is raised
                    reportPage.UnlimitedWidthValue = width;
                }

                bitmap = new Bitmap((int)(width * resolution), (int)(height * resolution));

                List<RichObject> richObjectsWithConvertRichText = new List<RichObject>();
                foreach (Base obj in reportPage.AllObjects)
                {
                    if (obj is RichObject)
                    {
                        RichObject rich = obj as RichObject;
                        if (rich.ConvertRichText)
                        {
                            rich.ConvertRichText = false;
                            richObjectsWithConvertRichText.Add(rich);
                        }
                    }
                }

                using (var cache = new GraphicCache())
                {
                    using (var g = Graphics.FromImage(bitmap))
                    {
                        reportPage.Draw(new FRPaintEventArgs(g, resolution, resolution, cache));
                    }
                }

                //returning the original page height and width of the report
                reportPage.PaperHeight = originalPaperHeight;
                reportPage.PaperWidth = originalPaperWidth;

                foreach (RichObject rich in richObjectsWithConvertRichText)
                {
                    rich.ConvertRichText = true;
                }
            }

            if (pages.Find(x => x.Name == lastPageName) is DialogPage dialogPage)
            {
                height = dialogPage.Form.Height;
                width = dialogPage.Form.Width;

                bitmap = DrawUtils.DrawToBitmap(dialogPage.Form, true);

                using (var cache = new GraphicCache())
                {
                    using (var g = Graphics.FromImage(bitmap))
                    {
                        foreach (DialogControl page in dialogPage.Controls)
                        {
                            page.Draw(new FRPaintEventArgs(g, resolution, resolution, cache));
                        }
                    }
                }

                dialogPage.Form.DrawToBitmap(bitmap, new Rectangle(0, 0, (int)width, (int)height));
            }

            picPreview.Image = bitmap;
        }
    }
}