using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Windows;
using System.Windows.Documents;
using GCHR.Model.Konto;

namespace GCHR.Control.Printing
{
    public class RandomTabularPaginator : DocumentPaginator
    {
        private int _rowsPerPage;
        private Size _pageSize;
        private readonly int _rows;
        private readonly List<HaendlerKonto> _konten;
        private readonly String _aktuellePeriode;
        private readonly String _altePeriode;

        public RandomTabularPaginator(String aktuellePeriode, String altePeriode, List<HaendlerKonto> konten, Size pageSize)
        {
            _aktuellePeriode = aktuellePeriode;
            _altePeriode = altePeriode;
            _konten = konten;
            _rows = konten.Count;
            PageSize = pageSize;
        }

        public override DocumentPage GetPage(int pageNumber)
        {
            var currentRow = _rowsPerPage * pageNumber;

            var page = new PageElement(currentRow, Math.Min(_rowsPerPage, _rows - currentRow), _konten, _aktuellePeriode, _altePeriode)
            {
                Width = PageSize.Width,
                Height = PageSize.Height,
            };

            page.Measure(PageSize);
            page.Arrange(new Rect(new Point(0, 0), PageSize));

            return new DocumentPage(page);
        }

        public override bool IsPageCountValid
        { get { return true; } }

        public override int PageCount
        { get { return (int)Math.Ceiling(_rows / (double)_rowsPerPage); } }

        public override sealed Size PageSize
        {
            get { return _pageSize; }
            set
            {
                _pageSize = value;

                _rowsPerPage = PageElement.RowsPerPage(PageSize.Height);

                //Can't print anything if you can't fit a row on a page
                Debug.Assert(_rowsPerPage > 0);
            }
        }

        public override IDocumentPaginatorSource Source
        { get { return null; } }
    }

}