import '../../favorites/models/favorite_asset_model.dart';
import '../models/fundamental_data_model.dart';

class TickerResolver {
  /// Resolves the optimal ticker according to user prioritization:
  /// 1. Candidate / active user-selected symbol (if valid and not equal to ISIN)
  /// 2. Favorite selected ticker (if asset is in favorites and has a valid ticker)
  /// 3. Primary Ticker (from Fundamentals header)
  /// 4. First available ticker from AvailableTickers list
  /// 5. ISIN fallback
  static String? resolve({
    required String isin,
    String? candidateSymbol,
    List<FavoriteAssetModel>? favoriteDetails,
    FundamentalDataModel? fundamentals,
  }) {
    final cleanIsin = isin.trim().toUpperCase();

    // 1. Check Candidate / User-selected symbol
    if (candidateSymbol != null && candidateSymbol.trim().isNotEmpty) {
      final cClean = candidateSymbol.trim();
      if (cClean.toUpperCase() != cleanIsin) {
        return cClean;
      }
    }

    // 2. Check Favorite selected ticker
    if (favoriteDetails != null && favoriteDetails.isNotEmpty) {
      for (final f in favoriteDetails) {
        final fIsin = f.isin.trim().toUpperCase();
        final fSym = f.symbol.trim().toUpperCase();
        if (fIsin == cleanIsin || fSym == cleanIsin) {
          if (f.symbol.trim().isNotEmpty && f.symbol.trim().toUpperCase() != cleanIsin) {
            return f.symbol.trim();
          }
        }
      }
    }

    // 3. Check Fundamentals Primary Ticker
    if (fundamentals != null) {
      final primary = fundamentals.primaryTicker.trim();
      if (primary.isNotEmpty && primary.toUpperCase() != cleanIsin) {
        return primary;
      }

      final fTicker = fundamentals.ticker.trim();
      if (fTicker.isNotEmpty && fTicker.toUpperCase() != cleanIsin) {
        return fTicker;
      }

      // 4. First available ticker in availableTickers
      for (final t in fundamentals.availableTickers) {
        final tTick = t.ticker.trim();
        if (tTick.isNotEmpty && tTick.toUpperCase() != cleanIsin) {
          return tTick;
        }
      }
    }

    // 5. Fallback: ISIN
    return isin.trim().isNotEmpty ? isin.trim() : null;
  }
}