import 'dart:async';
import 'package:flutter/foundation.dart';
import '../services/nymea_service.dart';

enum SchedulerStrategy { rulesBased, manual, aiPro }

extension SchedulerStrategyExt on SchedulerStrategy {
  String get label => switch (this) {
        SchedulerStrategy.rulesBased => 'Basée sur les règles',
        SchedulerStrategy.manual     => 'Manuelle',
        SchedulerStrategy.aiPro      => 'AI (Pro)',
      };
  bool get isPro => this == SchedulerStrategy.aiPro;
}

class SchedulerConfig {
  final double priceThreshold;    // €/kWh
  final double minSurplus;        // W
  final int    planningHorizon;   // heures
  final int    recalcInterval;    // minutes
  final double selfSufficiencyGoal; // %

  const SchedulerConfig({
    this.priceThreshold     = 0.08,
    this.minSurplus         = 200,
    this.planningHorizon    = 24,
    this.recalcInterval     = 15,
    this.selfSufficiencyGoal = 70,
  });

  SchedulerConfig copyWith({
    double? priceThreshold,
    double? minSurplus,
    int?    planningHorizon,
    int?    recalcInterval,
    double? selfSufficiencyGoal,
  }) => SchedulerConfig(
        priceThreshold:      priceThreshold      ?? this.priceThreshold,
        minSurplus:          minSurplus          ?? this.minSurplus,
        planningHorizon:     planningHorizon     ?? this.planningHorizon,
        recalcInterval:      recalcInterval      ?? this.recalcInterval,
        selfSufficiencyGoal: selfSufficiencyGoal ?? this.selfSufficiencyGoal,
      );
}

enum SchedulerStatus { ok, degraded, error }

class SchedulerState {
  final SchedulerStatus status;
  final String          reason;
  final DateTime?       lastPlanning;
  final DateTime?       nextPlanning;

  const SchedulerState({
    this.status      = SchedulerStatus.ok,
    this.reason      = '',
    this.lastPlanning,
    this.nextPlanning,
  });
}

/// Gère la stratégie, la configuration et l'état du scheduler EMS.
class SchedulerProvider extends ChangeNotifier {
  SchedulerStrategy _strategy = SchedulerStrategy.rulesBased;
  SchedulerConfig   _config   = const SchedulerConfig();
  SchedulerState    _state    = const SchedulerState();
  bool              _loading  = false;

  SchedulerStrategy get strategy => _strategy;
  SchedulerConfig   get config   => _config;
  SchedulerState    get state    => _state;
  bool              get loading  => _loading;

  // ── Chargement depuis nymea (stub — à brancher sur RPC réel) ────────────────
  Future<void> load(NymeaService service) async {
    _loading = true;
    notifyListeners();

    await Future.delayed(const Duration(milliseconds: 300));
    _state = SchedulerState(
      status:       SchedulerStatus.ok,
      reason:       'TariffManager: aWATTar AT actif',
      lastPlanning: DateTime.now().subtract(const Duration(minutes: 8)),
      nextPlanning: DateTime.now().add(const Duration(minutes: 7)),
    );
    _loading = false;
    notifyListeners();
  }

  // ── Mutations ────────────────────────────────────────────────────────────────
  void setStrategy(SchedulerStrategy s) {
    _strategy = s;
    notifyListeners();
    // TODO: _sendRequest('Energy.SetSchedulerStrategy', ...)
  }

  void updateConfig(SchedulerConfig c) {
    _config = c;
    notifyListeners();
    // TODO: _sendRequest('Energy.SetSchedulerConfig', ...)
  }

  Future<void> forceRecalc(NymeaService service) async {
    _loading = true;
    notifyListeners();
    await Future.delayed(const Duration(seconds: 1));
    _state = _state;  // Mettre à jour depuis la réponse RPC
    _loading = false;
    notifyListeners();
  }
}