Feat earthquake report

lib/app/router/app_router.dart

@@ -2,6 +2,7 @@ import 'package:dpip/app/shell/main_shell.dart';
 import 'package:dpip/core/settings/onboarding_store.dart';
 import 'package:dpip/features/data/presentation/pages/data_page.dart';
 import 'package:dpip/features/earthquake/presentation/pages/earthquake_page.dart';
+import 'package:dpip/features/earthquake/presentation/pages/report_detail_page.dart';
 import 'package:dpip/features/earthquake/presentation/pages/report_list_page.dart';
 import 'package:dpip/features/events/presentation/pages/events_page.dart';
 import 'package:dpip/features/home/presentation/pages/home_page.dart';
@@ -71,6 +72,15 @@ final GoRouter appRouter = GoRouter(
                   path: AppRoutes.earthquakePath,
                   name: AppRoutes.earthquake,
                   builder: (_, _) => const ReportListPage(),
+                  routes: [
+                    GoRoute(
+                      path: AppRoutes.earthquakeReportPath,
+                      name: AppRoutes.earthquakeReport,
+                      builder: (_, state) => ReportDetailPage(
+                        reportId: state.pathParameters['id']!,
+                      ),
+                    ),
+                  ],
                 ),
                 GoRoute(
                   path: AppRoutes.eewPath,

lib/features/earthquake/data/report_repository_impl.dart

@@ -4,6 +4,7 @@ library;
 import 'package:dpip/core/error/result.dart';
 import 'package:dpip/core/network/api_exception.dart';
 import 'package:dpip/features/earthquake/data/earthquake_api.dart';
+import 'package:dpip/features/earthquake/domain/earthquake_report.dart';
 import 'package:dpip/features/earthquake/domain/partial_earthquake_report.dart';
 import 'package:dpip/features/earthquake/domain/report_list_query.dart';
 import 'package:dpip/features/earthquake/domain/report_repository.dart';
@@ -40,6 +41,12 @@ class ReportRepositoryImpl implements ReportRepository {
     return parseReportList(raw);
   });
 
+  @override
+  Future<Result<EarthquakeReport>> get(String id) => guardResult(() async {
+    final raw = await _api.getReport(id);
+    return EarthquakeReport.fromJson((raw as Map).cast<String, dynamic>());
+  });
+
   /// Skips malformed rows so one bad record cannot blank the catalogue.
   static List<PartialEarthquakeReport> parseReportList(List<dynamic> raw) {
     return [

lib/features/earthquake/domain/earthquake_report.dart

@@ -0,0 +1,127 @@
+/// Full earthquake report — `GET /api/v2/eq/report/{id}`, the per-area/town
+/// intensity breakdown behind a catalogue row ([PartialEarthquakeReport]).
+library;
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'earthquake_report.freezed.dart';
+part 'earthquake_report.g.dart';
+
+/// The full earthquake report — epicentre, magnitude, and the per-area/town
+/// felt-intensity breakdown. Fetched by id from [ReportRepository.get] when a
+/// catalogue row is opened.
+@freezed
+abstract class EarthquakeReport with _$EarthquakeReport {
+  const EarthquakeReport._();
+
+  const factory EarthquakeReport({
+    required String id,
+    @JsonKey(name: 'lon') required double longitude,
+    @JsonKey(name: 'lat') required double latitude,
+    @JsonKey(name: 'loc') required String location,
+    required double depth,
+    @JsonKey(name: 'mag') required double magnitude,
+    required Map<String, AreaIntensity> list,
+
+    /// Origin time as Unix **milliseconds**.
+    required int time,
+    required int trem,
+  }) = _EarthquakeReport;
+
+  factory EarthquakeReport.fromJson(Map<String, dynamic> json) =>
+      _$EarthquakeReportFromJson(json);
+
+  /// Leading CWA serial segment (e.g. `115032` or `115000`).
+  String get serial => id.split('-').first;
+
+  /// `…000` serials are 小區域有感 — no numbered CWA report.
+  bool get isLocalFelt => serial.endsWith('000');
+
+  /// Numbered CWA report id, or null when [isLocalFelt].
+  String? get number => isLocalFelt ? null : serial;
+
+  bool get hasNumber => number != null;
+
+  /// Origin time in UTC.
+  DateTime get originTimeUtc =>
+      DateTime.fromMillisecondsSinceEpoch(time, isUtc: true);
+
+  /// Short place string — prefer the parenthetical CWA locality when present.
+  String get shortLocation {
+    final open = location.indexOf('(');
+    final close = location.indexOf(')');
+    if (open >= 0 && close > open) {
+      var inner = location.substring(open + 1, close);
+      if (inner.startsWith('位於')) inner = inner.substring(2);
+      return inner.trim();
+    }
+    final fang = location.indexOf('方');
+    if (fang >= 0) return location.substring(0, fang + 1).trim();
+    return location.trim();
+  }
+
+  /// Highest observed intensity across every area/town in [list].
+  int get maxIntensity {
+    var max = 0;
+    for (final area in list.values) {
+      for (final town in area.town.values) {
+        if (town.intensity > max) max = town.intensity;
+      }
+    }
+    return max;
+  }
+
+  /// The official CWA report page for this event.
+  Uri get reportUrl {
+    final segments = id.split('-')..removeAt(0);
+    final magCode = (magnitude * 10).floor();
+    final numberSuffix = hasNumber ? number!.substring(3) : '';
+    return Uri.parse(
+      'https://scweb.cwa.gov.tw/zh-tw/earthquake/details/'
+      '${segments.join()}$magCode$numberSuffix',
+    );
+  }
+
+  /// CWA's rendered report image (地震報告圖). The filename is derived from the
+  /// Taipei-local origin time, magnitude, and (when numbered) the report's
+  /// serial suffix — CWA doesn't expose this as a field, only as a static path.
+  Uri get reportImageUrl {
+    final t = originTimeUtc.add(const Duration(hours: 8)); // Asia/Taipei
+    final y = t.year.toString();
+    final mo = t.month.toString().padLeft(2, '0');
+    final d = t.day.toString().padLeft(2, '0');
+    final h = t.hour.toString().padLeft(2, '0');
+    final mi = t.minute.toString().padLeft(2, '0');
+    final s = t.second.toString().padLeft(2, '0');
+    final magCode = (magnitude * 10).floor();
+    final numberSuffix = hasNumber ? number!.substring(3) : '';
+    final name = '$y$mo$d$h$mi$s$magCode${numberSuffix}_H.png';
+    final yearMonth = name.substring(0, 6);
+    return Uri.parse('https://scweb.cwa.gov.tw/webdata/OLDEQ/$yearMonth/$name');
+  }
+}
+
+/// One area's (縣市) maximum observed intensity and its station/town breakdown.
+@freezed
+abstract class AreaIntensity with _$AreaIntensity {
+  const factory AreaIntensity({
+    @JsonKey(name: 'int') required int intensity,
+    required Map<String, StationIntensity> town,
+  }) = _AreaIntensity;
+
+  factory AreaIntensity.fromJson(Map<String, dynamic> json) =>
+      _$AreaIntensityFromJson(json);
+}
+
+/// One station/town's observed intensity and coordinates.
+@freezed
+abstract class StationIntensity with _$StationIntensity {
+  const factory StationIntensity({
+    @JsonKey(name: 'lon') required double longitude,
+    @JsonKey(name: 'lat') required double latitude,
+    @JsonKey(name: 'int') required int intensity,
+  }) = _StationIntensity;
+
+  factory StationIntensity.fromJson(Map<String, dynamic> json) =>
+      _$StationIntensityFromJson(json);
+}