81 lines
2.1 KiB
Dart
81 lines
2.1 KiB
Dart
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import 'dart:convert';
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import 'dart:io';
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class HashEntry {
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const HashEntry({
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required this.cardId,
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required this.hash,
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this.filename,
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});
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final String cardId;
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final String hash;
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final String? filename;
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/// Flutter asset path for the gallery image.
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String? get assetPath =>
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filename == null ? null : 'test_assets/$filename';
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}
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class HashLibrary {
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const HashLibrary({
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required this.version,
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required this.algorithm,
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required this.hashBits,
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required this.items,
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});
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final String version;
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final String algorithm;
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final int hashBits;
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final List<HashEntry> items;
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static HashLibrary fromJson(Map<String, dynamic> json) {
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final rawItems = (json['items'] as List<dynamic>? ?? const []);
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return HashLibrary(
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version: json['version'] as String? ?? 'assets-v1',
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algorithm: json['algorithm'] as String? ?? 'rgb-phash-v1',
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hashBits: json['hash_bits'] as int? ?? 105,
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items: rawItems
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.map((e) {
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final m = e as Map<String, dynamic>;
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return HashEntry(
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cardId: m['card_id'] as String,
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hash: m['hash'] as String,
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filename: m['filename'] as String?,
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);
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})
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.toList(growable: false),
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);
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}
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Map<String, dynamic> toJson() => {
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'version': version,
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'algorithm': algorithm,
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'hash_bits': hashBits,
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'card_count': items.length,
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'items': items
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.map(
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(e) => {
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'card_id': e.cardId,
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'hash': e.hash,
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if (e.filename != null) 'filename': e.filename,
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},
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)
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.toList(growable: false),
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};
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/// Load from filesystem (CLI scripts / tests).
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static Future<HashLibrary> loadFile(String path) async {
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final text = await File(path).readAsString();
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return fromJson(jsonDecode(text) as Map<String, dynamic>);
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}
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Future<void> saveFile(String path) async {
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final file = File(path);
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await file.parent.create(recursive: true);
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const encoder = JsonEncoder.withIndent(' ');
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await file.writeAsString('${encoder.convert(toJson())}\n');
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}
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}
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