using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Printing;
using Common;
using Config.Entities;

namespace SharedDatabase.Output.Printers
{
    public class PrintersCommon : PrintDocument
    {
        static Font lastFont = null;
        static float lastSpacing = 0;

        /// <summary>
        /// Measure the size of a paragraph of text, lines are separated by '~'.
        /// </summary>
        /// <param name="e">PrintPageEventArgs</param>
        /// <param name="text">Text, lines are separated by '~'</param>
        /// <param name="font">Font</param>
        /// <returns>Size of the paragraph of text</returns>
        public static SizeF Measure(System.Drawing.Printing.PrintPageEventArgs e, string text, Font font)
        {
            if (font != lastFont)
            {
                lastFont = font;
                lastSpacing = e.Graphics.MeasureString("Abcgq", font).Height;
            }

            string[] lines = text.Split(new char[] { '~' });
            float width = 0;
            foreach (var line in lines)
            {
                float lineWid = e.Graphics.MeasureString(line, font).Width;
                if (lineWid > width) width = lineWid;
            }

            return new SizeF(width, 0.8f * lines.Length * lastSpacing + 0.2f);
        }

        /// <summary>
        /// Print a paragraph of text, lines are separated by '~'.
        /// </summary>
        /// <param name="e">PrintPageEventArgs</param>
        /// <param name="text">Text, lines are separated by '~'</param>
        /// <param name="font">Font</param>
        /// <param name="x">Position x</param>
        /// <param name="y">Position y</param>
        /// <param name="width">Width (required when alignment=Alignment.Center or alignment=Aligmenr.Right</param>
        /// <param name="height">Height, 0 = no vertical centering</param>
        /// <param name="horizAlignment">Horizontal alignment</param>
        /// <param name="vertAlignment">Vertical alignment</param>
        public static void PrintAt(System.Drawing.Printing.PrintPageEventArgs e, string text, Font font,
                                   float x, float y, float width, float height,
                                   Alignment horizAlignment, VertAlignment vertAlignment)
        {
            SizeF size = PrintersCommon.Measure(e, text, font);

            string[] lines = text.Split(new char[] { '~' });

            if (height <= size.Height) vertAlignment = VertAlignment.Top;
            float y0;
            switch (vertAlignment)
            {
                default:
                case VertAlignment.Top:     y0 = y; break;
                case VertAlignment.Middle:  y0 = y + (height - size.Height) / 2; break;
                case VertAlignment.Bottom:  y0 = y + (height - size.Height); break;
            }
                     
            foreach (var line in lines)
            {
                float x0;
                switch (horizAlignment)
                {
                    default:
                    case Alignment.Left:    x0 = x; break;
                    case Alignment.Center:  x0 = x + (width - e.Graphics.MeasureString(line, font).Width) / 2; break;
                    case Alignment.Right:   x0 = x + width - e.Graphics.MeasureString(line, font).Width; break;
                }
                e.Graphics.DrawString(line, font, Brushes.Black, new PointF(x0, y0));
                y0 += 0.8f * lastSpacing;
            }
        }
    }
}