/*
 * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import 'dart:typed_data';

import 'package:meta/meta.dart';
import 'package:pdf/pdf.dart';

import 'widget.dart';

enum Type1Fonts {
  courier,
  courierBold,
  courierBoldOblique,
  courierOblique,
  helvetica,
  helveticaBold,
  helveticaBoldOblique,
  helveticaOblique,
  times,
  timesBold,
  timesBoldItalic,
  timesItalic,
  symbol,
  zapfDingbats
}

/// Lazy font declaration, registers the font in the document only if needed.
/// Tries to register a font only once
class Font {
  Font() : font = null;

  Font.type1(Type1Fonts this.font);

  factory Font.courier() => Font.type1(Type1Fonts.courier);
  factory Font.courierBold() => Font.type1(Type1Fonts.courierBold);
  factory Font.courierBoldOblique() =>
      Font.type1(Type1Fonts.courierBoldOblique);
  factory Font.courierOblique() => Font.type1(Type1Fonts.courierOblique);
  factory Font.helvetica() => Font.type1(Type1Fonts.helvetica);
  factory Font.helveticaBold() => Font.type1(Type1Fonts.helveticaBold);
  factory Font.helveticaBoldOblique() =>
      Font.type1(Type1Fonts.helveticaBoldOblique);
  factory Font.helveticaOblique() => Font.type1(Type1Fonts.helveticaOblique);
  factory Font.times() => Font.type1(Type1Fonts.times);
  factory Font.timesBold() => Font.type1(Type1Fonts.timesBold);
  factory Font.timesBoldItalic() => Font.type1(Type1Fonts.timesBoldItalic);
  factory Font.timesItalic() => Font.type1(Type1Fonts.timesItalic);
  factory Font.symbol() => Font.type1(Type1Fonts.symbol);
  factory Font.zapfDingbats() => Font.type1(Type1Fonts.zapfDingbats);
  factory Font.ttf(ByteData data) => TtfFont(data);

  final Type1Fonts? font;

  static const Map<Type1Fonts, String> _type1Map = <Type1Fonts, String>{
    Type1Fonts.courier: 'Courier',
    Type1Fonts.courierBold: 'Courier-Bold',
    Type1Fonts.courierBoldOblique: 'Courier-BoldOblique',
    Type1Fonts.courierOblique: 'Courier-Oblique',
    Type1Fonts.helvetica: 'Helvetica',
    Type1Fonts.helveticaBold: 'Helvetica-Bold',
    Type1Fonts.helveticaBoldOblique: 'Helvetica-BoldOblique',
    Type1Fonts.helveticaOblique: 'Helvetica-Oblique',
    Type1Fonts.times: 'Times-Roman',
    Type1Fonts.timesBold: 'Times-Bold',
    Type1Fonts.timesBoldItalic: 'Times-BoldItalic',
    Type1Fonts.timesItalic: 'Times-Italic',
    Type1Fonts.symbol: 'Symbol',
    Type1Fonts.zapfDingbats: 'ZapfDingbats'
  };

  String? get fontName => _type1Map[font];

  @protected
  PdfFont buildFont(PdfDocument pdfDocument) {
    return pdfDocument.fonts.firstWhere(
      (PdfFont font) => font.subtype == '/Type1' && font.fontName == fontName,
      orElse: () {
        switch (font) {
          case Type1Fonts.courier:
            return PdfFont.courier(pdfDocument);
          case Type1Fonts.courierBold:
            return PdfFont.courierBold(pdfDocument);
          case Type1Fonts.courierBoldOblique:
            return PdfFont.courierBoldOblique(pdfDocument);
          case Type1Fonts.courierOblique:
            return PdfFont.courierOblique(pdfDocument);
          case Type1Fonts.helvetica:
            return PdfFont.helvetica(pdfDocument);
          case Type1Fonts.helveticaBold:
            return PdfFont.helveticaBold(pdfDocument);
          case Type1Fonts.helveticaBoldOblique:
            return PdfFont.helveticaBoldOblique(pdfDocument);
          case Type1Fonts.helveticaOblique:
            return PdfFont.helveticaOblique(pdfDocument);
          case Type1Fonts.times:
            return PdfFont.times(pdfDocument);
          case Type1Fonts.timesBold:
            return PdfFont.timesBold(pdfDocument);
          case Type1Fonts.timesBoldItalic:
            return PdfFont.timesBoldItalic(pdfDocument);
          case Type1Fonts.timesItalic:
            return PdfFont.timesItalic(pdfDocument);
          case Type1Fonts.symbol:
            return PdfFont.symbol(pdfDocument);
          case Type1Fonts.zapfDingbats:
            return PdfFont.zapfDingbats(pdfDocument);
          case null:
            return PdfFont.helvetica(pdfDocument);
        }
      },
    );
  }

  PdfFont? _pdfFont;

  PdfFont? getFont(Context context) {
    if (_pdfFont == null || _pdfFont!.pdfDocument != context.document) {
      final pdfDocument = context.document;
      _pdfFont = buildFont(pdfDocument);
    }

    return _pdfFont;
  }

  @override
  String toString() => '<Type1 Font "$fontName">';
}

class TtfFont extends Font {
  TtfFont(this.data, {this.protect = false});

  final ByteData data;

  final bool protect;

  @override
  PdfFont buildFont(PdfDocument pdfDocument) {
    return PdfTtfFont(pdfDocument, data, protect: protect);
  }

  @override
  String? get fontName {
    if (_pdfFont != null) {
      return _pdfFont!.fontName;
    }

    final font = TtfParser(data);
    return font.fontName;
  }

  @override
  String toString() {
    final font = TtfParser(data);
    return '<TrueType Font "${font.fontName}">';
  }
}