using System;
using System.IO;
using PdfSharp.Drawing;
using PdfSharp.Fonts;

namespace spplus;

/// <summary>
/// Custom font resolver for PdfSharp that loads fonts from the res/fonts directory.
/// </summary>
public class CustomFontResolver : IFontResolver
{
    private static string? _fontPath;

    public CustomFontResolver()
    {
        // Try to locate the fonts directory
        var basePath = AppDomain.CurrentDomain.BaseDirectory;
        var possiblePaths = new[]
        {
            Path.Combine(basePath, "res", "fonts"),
            Path.Combine(basePath, "fonts"),
            Path.Combine(Directory.GetCurrentDirectory(), "res", "fonts"),
            Path.Combine(Directory.GetCurrentDirectory(), "fonts"),
        };

        foreach (var path in possiblePaths)
        {
            if (Directory.Exists(path))
            {
                _fontPath = path;
                break;
            }
        }

        if (_fontPath == null)
        {
            throw new DirectoryNotFoundException(
                $"Font directory not found. Searched: {string.Join(", ", possiblePaths)}");
        }
    }

    public FontResolverInfo ResolveTypeface(string familyName, bool isBold, bool isItalic)
    {
        // Map family name to font file
        var fileName = familyName switch
        {
            "Cantarell" => isBold 
                ? isItalic ? "Cantarell-BoldItalic.ttf" : "Cantarell-Bold.ttf"
                : isItalic ? "Cantarell-Italic.ttf" : "Cantarell-Regular.ttf",
            _ => isBold
                ? isItalic ? "Cantarell-BoldItalic.ttf" : "Cantarell-Bold.ttf"
                : isItalic ? "Cantarell-Italic.ttf" : "Cantarell-Regular.ttf"
        };

        var fontPath = Path.Combine(_fontPath, fileName);
        
        if (!File.Exists(fontPath))
        {
            throw new FileNotFoundException($"Font file not found: {fontPath}");
        }

        // Return a FontResolverInfo with the font path
        return new FontResolverInfo(fontPath);
    }

    public byte[]? GetFont(string faceName)
    {
        // faceName is the path returned by ResolveTypeface
        if (File.Exists(faceName))
        {
            return File.ReadAllBytes(faceName);
        }

        return null;
    }
}