using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace FractalVisualizer.UI;

public sealed class HudBitmapFont
{
    private static readonly Dictionary<char, string[]> Glyphs = new()
    {
        ['A'] = ["01110", "10001", "10001", "11111", "10001", "10001", "10001"],
        ['B'] = ["11110", "10001", "10001", "11110", "10001", "10001", "11110"],
        ['C'] = ["01111", "10000", "10000", "10000", "10000", "10000", "01111"],
        ['D'] = ["11110", "10001", "10001", "10001", "10001", "10001", "11110"],
        ['E'] = ["11111", "10000", "10000", "11110", "10000", "10000", "11111"],
        ['F'] = ["11111", "10000", "10000", "11110", "10000", "10000", "10000"],
        ['G'] = ["01111", "10000", "10000", "10111", "10001", "10001", "01111"],
        ['H'] = ["10001", "10001", "10001", "11111", "10001", "10001", "10001"],
        ['I'] = ["01110", "00100", "00100", "00100", "00100", "00100", "01110"],
        ['J'] = ["00001", "00001", "00001", "00001", "10001", "10001", "01110"],
        ['K'] = ["10001", "10010", "10100", "11000", "10100", "10010", "10001"],
        ['L'] = ["10000", "10000", "10000", "10000", "10000", "10000", "11111"],
        ['M'] = ["10001", "11011", "10101", "10001", "10001", "10001", "10001"],
        ['N'] = ["10001", "11001", "10101", "10011", "10001", "10001", "10001"],
        ['O'] = ["01110", "10001", "10001", "10001", "10001", "10001", "01110"],
        ['P'] = ["11110", "10001", "10001", "11110", "10000", "10000", "10000"],
        ['Q'] = ["01110", "10001", "10001", "10001", "10101", "10010", "01101"],
        ['R'] = ["11110", "10001", "10001", "11110", "10100", "10010", "10001"],
        ['S'] = ["01111", "10000", "10000", "01110", "00001", "00001", "11110"],
        ['T'] = ["11111", "00100", "00100", "00100", "00100", "00100", "00100"],
        ['U'] = ["10001", "10001", "10001", "10001", "10001", "10001", "01110"],
        ['V'] = ["10001", "10001", "10001", "10001", "10001", "01010", "00100"],
        ['W'] = ["10001", "10001", "10001", "10001", "10101", "11011", "10001"],
        ['X'] = ["10001", "10001", "01010", "00100", "01010", "10001", "10001"],
        ['Y'] = ["10001", "10001", "01010", "00100", "00100", "00100", "00100"],
        ['Z'] = ["11111", "00001", "00010", "00100", "01000", "10000", "11111"],
        ['0'] = ["01110", "10001", "10011", "10101", "11001", "10001", "01110"],
        ['1'] = ["00100", "01100", "00100", "00100", "00100", "00100", "01110"],
        ['2'] = ["01110", "10001", "00001", "00010", "00100", "01000", "11111"],
        ['3'] = ["11110", "00001", "00001", "01110", "00001", "00001", "11110"],
        ['4'] = ["00010", "00110", "01010", "10010", "11111", "00010", "00010"],
        ['5'] = ["11111", "10000", "10000", "11110", "00001", "00001", "11110"],
        ['6'] = ["01110", "10000", "10000", "11110", "10001", "10001", "01110"],
        ['7'] = ["11111", "00001", "00010", "00100", "01000", "01000", "01000"],
        ['8'] = ["01110", "10001", "10001", "01110", "10001", "10001", "01110"],
        ['9'] = ["01110", "10001", "10001", "01111", "00001", "00001", "01110"],
        ['.'] = ["00000", "00000", "00000", "00000", "00000", "00110", "00110"],
        ['-'] = ["00000", "00000", "00000", "01110", "00000", "00000", "00000"],
        [':'] = ["00000", "00110", "00110", "00000", "00110", "00110", "00000"],
        [' '] = ["00000", "00000", "00000", "00000", "00000", "00000", "00000"]
    };

    public void DrawText(SpriteBatch spriteBatch, Texture2D pixel, string text, int x, int y, int scale, Color color)
    {
        int cursorX = x;
        for (int i = 0; i < text.Length; i++)
        {
            char c = char.ToUpperInvariant(text[i]);
            if (!Glyphs.TryGetValue(c, out string[]? glyph))
            {
                glyph = Glyphs[' '];
            }

            DrawGlyph(spriteBatch, pixel, glyph, cursorX, y, scale, color);
            cursorX += (6 * scale);
        }
    }

    private static void DrawGlyph(SpriteBatch spriteBatch, Texture2D pixel, string[] glyph, int x, int y, int scale, Color color)
    {
        for (int row = 0; row < glyph.Length; row++)
        {
            string line = glyph[row];
            for (int col = 0; col < line.Length; col++)
            {
                if (line[col] != '1')
                {
                    continue;
                }

                spriteBatch.Draw(pixel, new Rectangle(x + (col * scale), y + (row * scale), scale, scale), color);
            }
        }
    }
}