import 'package:fintracker_api/fintracker_api.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../core/api/api_client.dart';
import '../../core/cache/cached.dart';
import 'benchmarks_card.dart' show benchmarkRowsProvider;

/// The reporting unit every portfolio screen is scoped to: `all`, `account:<id>` or
/// `portfolio:<id>`. Held in one place so switching it on Позиции also switches Аллокация
/// and the instrument card — three screens showing different scopes would be a trap.
final scopeProvider = StateProvider<String>((ref) => 'all');

/// A small cross-screen selector (Портфель, Доходы, Налоги, the goal dialog), not a screen's
/// own primary read — left un-cached per `docs/ai/offline-cache.md`. The underlying `GET`
/// still gets served from the shared cache transparently on a network failure; this provider
/// just does not surface `fetchedAt` for a banner.
final scopesProvider = FutureProvider.autoDispose<List<ScopeOut>>((ref) async {
  final r = await ref.watch(apiProvider).getAnalyticsApi().analyticsScopes();
  return r.data ?? const [];
});

/// See `docs/ai/offline-cache.md`.
final portfolioSummaryProvider = FutureProvider.autoDispose<Cached<SummaryOut>>((ref) async {
  final scope = ref.watch(scopeProvider);
  final r = await ref.watch(apiProvider).getAnalyticsApi().analyticsSummary(scope: scope);
  return r.cached;
});

final holdingsProvider = FutureProvider.autoDispose<Cached<List<HoldingOut>>>((ref) async {
  final scope = ref.watch(scopeProvider);
  final r = await ref.watch(apiProvider).getAnalyticsApi().analyticsHoldings(scope: scope);
  return Cached(r.data ?? const [], fetchedAt: r.extra['fetchedAt'] as DateTime?);
});

final portfolioReturnsProvider = FutureProvider.autoDispose<Cached<List<ReturnsOut>>>((ref) async {
  final scope = ref.watch(scopeProvider);
  final r = await ref.watch(apiProvider).getAnalyticsApi().analyticsReturns(scope: scope);
  return Cached(r.data ?? const [], fetchedAt: r.extra['fetchedAt'] as DateTime?);
});

final allocationProvider = FutureProvider.autoDispose<Cached<List<AllocationBucket>>>((ref) async {
  final scope = ref.watch(scopeProvider);
  final r = await ref.watch(apiProvider).getAnalyticsApi().analyticsAllocation(scope: scope);
  return Cached(r.data ?? const [], fetchedAt: r.extra['fetchedAt'] as DateTime?);
});

/// Daily portfolio value for the last year, for the chart on Позиции.
final valueSeriesProvider = FutureProvider.autoDispose<Cached<List<ValueDay>>>((ref) async {
  final scope = ref.watch(scopeProvider);
  final now = DateTime.now();
  final r = await ref.watch(apiProvider).getAnalyticsApi().analyticsValueSeries(
        scope: scope,
        from: now.subtract(const Duration(days: 365)),
        to: now,
      );
  return Cached(r.data ?? const [], fetchedAt: r.extra['fetchedAt'] as DateTime?);
});

final instrumentProvider =
    FutureProvider.autoDispose.family<Cached<InstrumentDetail>, int>((ref, instrumentId) async {
  final scope = ref.watch(scopeProvider);
  final r = await ref
      .watch(apiProvider)
      .getInstrumentsApi()
      .instrumentsGet(instrumentId: instrumentId, scope: scope);
  return r.cached;
});

/// Every portfolio provider, refreshed together after a metrics rebuild or a pull-to-refresh.
void invalidatePortfolioProviders(WidgetRef ref) {
  ref.invalidate(portfolioSummaryProvider);
  ref.invalidate(holdingsProvider);
  ref.invalidate(portfolioReturnsProvider);
  ref.invalidate(allocationProvider);
  ref.invalidate(valueSeriesProvider);
  ref.invalidate(instrumentProvider);
  // the benchmark block lives on Позиции and is scoped the same way
  ref.invalidate(benchmarkRowsProvider);
}