//
//  StockSettingsStore.swift
//  iris
//

import Foundation
import Combine

@MainActor
final class StockSettingsStore: ObservableObject {
    nonisolated static let userDefaultsKey = "iris.stock.symbols"

    @Published private(set) var symbols: [String] = []

    private let maxSymbols = 5

    init() {
        loadSymbols()
    }

    private func loadSymbols() {
        symbols = UserDefaults.standard.stringArray(forKey: Self.userDefaultsKey) ?? []
    }

    func saveSymbols(_ newSymbols: [String]) {
        let cleaned = newSymbols
            .map { $0.uppercased().trimmingCharacters(in: .whitespacesAndNewlines) }
            .filter { !$0.isEmpty }
            .prefix(maxSymbols)
        symbols = Array(cleaned)
        UserDefaults.standard.set(symbols, forKey: Self.userDefaultsKey)
    }

    @discardableResult
    func addSymbol(_ symbol: String) -> Bool {
        guard symbols.count < maxSymbols else { return false }
        let cleaned = symbol.uppercased().trimmingCharacters(in: .whitespacesAndNewlines)
        guard !cleaned.isEmpty, !symbols.contains(cleaned) else { return false }
        symbols.append(cleaned)
        UserDefaults.standard.set(symbols, forKey: Self.userDefaultsKey)
        return true
    }

    func removeSymbol(_ symbol: String) {
        symbols.removeAll { $0 == symbol.uppercased() }
        UserDefaults.standard.set(symbols, forKey: Self.userDefaultsKey)
    }
}