//
//  Asset.swift
//  OS Vault
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//

import Foundation

/// Anything the wallet can send on an EVM chain: the chain's native coin
/// (ETH, POL, BNB, AVAX, xDAI… — also the gas currency) or a registered
/// ERC-20 stablecoin. Native symbol/name depend on the chain, so they are
/// resolved against a Network.
public enum Asset: Identifiable, Hashable, Sendable {
    case native
    case token(Token)

    public var id: String {
        switch self {
        case .native: return "native"
        case .token(let token): return "token-\(token.symbol)"
        }
    }

    public func symbol(on network: Network) -> String {
        switch self {
        case .native: return network.config.nativeSymbol
        case .token(let token): return token.symbol
        }
    }

    public func name(on network: Network) -> String {
        switch self {
        case .native: return network.config.nativeName
        case .token(let token): return token.name
        }
    }

    /// All supported natives are 18 decimals (ETH, POL, BNB, AVAX, xDAI).
    public var decimals: Int {
        switch self {
        case .native: return 18
        case .token(let token): return token.decimals
        }
    }

    public static func available(on network: Network) -> [Asset] {
        Token.available(on: network).map(Asset.token) + [.native]
    }
}