import 'dart:convert';

import 'package:halkyon_content/rich_text.dart';
import 'package:test/test.dart';

void main() {
  /// The editor's JSON for a page with one paragraph per text.
  Map<String, Object?> paragraphs(List<String> texts) => {
    'document': {
      'type': 'page',
      'children': [
        for (final text in texts)
          {
            'type': 'paragraph',
            'data': {
              'delta': [
                {'insert': text},
              ],
            },
          },
      ],
    },
  };

  group('RichContent', () {
    test('without a first heading that repeats a title, whatever its case '
        'and spaces; anything else stays', () {
      RichContent page(List<Map<String, Object?>> children) => RichContent({
        'document': {'type': 'page', 'children': children},
      });
      Map<String, Object?> heading(String text) => {
        'type': 'heading',
        'data': {
          'level': 1,
          'delta': [
            {'insert': text},
          ],
        },
      };
      final text = {
        'type': 'paragraph',
        'data': {
          'delta': [
            {'insert': 'In Japanese…'},
          ],
        },
      };

      expect(
        page([heading('What is  Kanji?'), text])
            .withoutHeading('what is kanji?'),
        page([text]),
      );
      final other = page([heading('Kanji'), text]);
      expect(other.withoutHeading('What is Kanji?'), other);
      final later = page([text, heading('What is Kanji?')]);
      expect(later.withoutHeading('What is Kanji?'), later);
      expect(other.withoutHeading(''), other);
    });

    test('equals content with the same JSON, whatever the key order', () {
      final a = RichContent({
        'document': {'type': 'page', 'children': <Object?>[]},
      });
      final b = RichContent({
        'document': {'children': <Object?>[], 'type': 'page'},
      });

      expect(a, b);
      expect(a.hashCode, b.hashCode);
    });

    test('differs when the text differs', () {
      expect(
        RichContent(paragraphs(['猫'])),
        isNot(RichContent(paragraphs(['犬']))),
      );
    });

    test('differs when the format version differs', () {
      expect(
        RichContent(paragraphs(['猫'])),
        isNot(RichContent(paragraphs(['猫']), formatVersion: 0)),
      );
    });

    test('is not affected by later changes to the JSON it was made from', () {
      final json = paragraphs(['猫']);
      final content = RichContent(json);

      final document = json['document']! as Map<String, Object?>;
      (document['children']! as List<Object?>).clear();

      expect(content, RichContent(paragraphs(['猫'])));
    });

    test('cannot be changed through its JSON', () {
      final content = RichContent(paragraphs(['猫']));
      final document = content.editorJson['document']! as Map<String, Object?>;
      final children = document['children']! as List<Object?>;

      expect(() => document['type'] = 'heading', throwsUnsupportedError);
      expect(children.clear, throwsUnsupportedError);
    });

    test('survives a JSON round trip, Japanese text and marks included', () {
      final content = RichContent({
        'document': {
          'type': 'page',
          'children': [
            {
              'type': 'heading',
              'data': {
                'level': 2,
                'delta': [
                  {'insert': '日本語'},
                ],
              },
            },
            {
              'type': 'paragraph',
              'data': {
                'delta': [
                  {
                    'insert': '猫',
                    'attributes': {'bold': true},
                  },
                  {'insert': 'は動物です。'},
                ],
              },
            },
          ],
        },
      });

      final stored = jsonEncode(content.toJson());
      final read = RichContent.fromJson(
        jsonDecode(stored) as Map<String, Object?>,
      );

      expect(read, content);
    });

    test('rejects content in a newer format than this app knows', () {
      expect(
        () => RichContent.fromJson({
          'formatVersion': RichContent.currentFormatVersion + 1,
          'editor': RichContent.empty().editorJson,
        }),
        throwsFormatException,
      );
    });

    test('rejects JSON that is not rich content', () {
      expect(
        () => RichContent.fromJson({'formatVersion': 1, 'editor': 'text'}),
        throwsFormatException,
      );
      expect(
        () => RichContent.fromJson({'editor': RichContent.empty().editorJson}),
        throwsFormatException,
      );
    });
  });

  test("RichContent.imageIds lists the person's images it shows, in order "
      'and once each; no sound, nor an image from elsewhere', () {
    Map<String, Object?> block(String type, String url) => {
      'type': type,
      'data': {'url': url},
    };
    final content = RichContent({
      'document': {
        'type': 'page',
        'children': [
          block('image', 'asset:b'),
          block('audio', 'asset:sound'),
          block('image', 'https://example.org/cat.png'),
          block('image', 'asset:a'),
          block('image', 'asset:b'),
        ],
      },
    });

    expect(content.imageIds, ['b', 'a']);
  });

  group('RichContent.plainText', () {
    test('is the text without formatting, one line per block', () {
      expect(
        RichContent(paragraphs(['ひらがな', 'かたかな'])).plainText,
        'ひらがな\nかたかな',
      );
    });

    test('joins the pieces of a formatted block', () {
      final content = RichContent({
        'document': {
          'type': 'page',
          'children': [
            {
              'type': 'paragraph',
              'data': {
                'delta': [
                  {'insert': 'big '},
                  {
                    'insert': 'cat',
                    'attributes': {'bold': true},
                  },
                ],
              },
            },
          ],
        },
      });

      expect(content.plainText, 'big cat');
    });

    test('is empty for empty content', () {
      expect(RichContent.empty().plainText, isEmpty);
    });
  });

  group('files', () {
    RichContent blocks(List<Map<String, Object?>> children) => RichContent({
      'document': {'type': 'page', 'children': children},
    });

    test('names the asset rows its images and sounds show', () {
      final content = blocks([
        {
          'type': 'image',
          'data': {'url': assetUrl('cat')},
        },
        {
          'type': 'audio',
          'data': {'url': assetUrl('neko')},
        },
        {
          'type': 'image',
          'data': {'url': 'https://example.com/dog.png'},
        },
      ]);

      expect(content.assetIds, {'cat', 'neko'});
      expect(content.hasImages, isTrue);
      expect(content.hasSounds, isTrue);
    });

    test('content of only an image or a sound is not blank', () {
      expect(
        blocks([
          {
            'type': 'image',
            'data': {'url': assetUrl('cat')},
          },
        ]).isBlank,
        isFalse,
      );
      expect(
        blocks([
          {
            'type': 'audio',
            'data': {'url': assetUrl('neko')},
          },
        ]).isBlank,
        isFalse,
      );
      expect(RichContent.plain('  ').isBlank, isTrue);
      expect(RichContent.empty().isBlank, isTrue);
    });

    test("a block's text counts as text: a formula, a callout's title, a "
        "video's caption, a study button's label, a spoiler's hidden text", () {
      final content = blocks([
        {
          'type': mathBlockType,
          'data': {mathFormulaKey: 'E = mc^2'},
        },
        {
          'type': calloutBlockType,
          'data': {calloutTitleKey: 'Mind the particle'},
          'children': [
            {
              'type': 'paragraph',
              'data': {
                'delta': [
                  {'insert': 'は, not わ'},
                ],
              },
            },
          ],
        },
        {
          'type': youtubeBlockType,
          'data': {youtubeVideoKey: 'dQw4w9WgXcQ', youtubeCaptionKey: 'Listen'},
        },
        {
          'type': studyButtonBlockType,
          'data': {
            studyButtonStudysetKey: 'japanese',
            studyButtonLabelKey: 'Go',
          },
        },
        {
          'type': spoilerBlockType,
          'data': {
            'delta': [
              {'insert': 'ねこ'},
            ],
          },
        },
      ]);

      expect(
        content.plainText,
        'E = mc^2\nMind the particle\nは, not わ\nListen\nGo\nねこ',
      );
    });

    test('a video or a study button is something without any text; an '
        'empty formula or callout is nothing', () {
      expect(
        blocks([
          {
            'type': youtubeBlockType,
            'data': {youtubeVideoKey: 'dQw4w9WgXcQ'},
          },
        ]).isBlank,
        isFalse,
      );
      expect(
        blocks([
          {
            'type': studyButtonBlockType,
            'data': {studyButtonStudysetKey: 'japanese'},
          },
        ]).isBlank,
        isFalse,
      );
      expect(
        blocks([
          {
            'type': mathBlockType,
            'data': {mathFormulaKey: ' '},
          },
          {'type': calloutBlockType, 'data': <String, Object?>{}},
        ]).isBlank,
        isTrue,
      );
    });

    test('reads only asset URLs as files of the person', () {
      expect(assetIdOf(assetUrl('cat')), 'cat');
      expect(assetIdOf('asset:'), isNull);
      expect(assetIdOf('https://example.com/cat.png'), isNull);
      expect(assetIdOf(42), isNull);
    });
  });
}