//
//  User.swift
//  meterios
//
//  (c) 2025 Martin "maride" Dessauer
//

import SwiftUI
import CryptoKit

struct User: Decodable, Identifiable, Hashable {
    var id: UUID = UUID() // Careful: meterios-internal ID, not Mete/Backend user accoint ID!
    var meteID: Int
    var displayName: String
    var displayImageURL: String
    var balance: Float
    
    private enum KeyMap : String, CodingKey { case id, name, email, balance }

    // Init function to be used with JSONDecoder, converting from SpaceMarket API's strange types to proper types
    init(from decoder : Decoder) throws {
        let container = try decoder.container(keyedBy: KeyMap.self)
        self.meteID = try container.decode(Int.self, forKey: .id)
        self.displayName = try container.decode(String.self, forKey: .name)
        self.displayImageURL = String(
            format: "https://secure.gravatar.com/avatar/%@",
            Insecure.MD5.hash(
                // e-mails may be empty as they are not required during the registration process in Mete
                // however, Gravatar requires them for the profile picture functionality.
                // Default to the profile picture of md5("0"), which is simply the Gravatar logo on blue background
                data: (((try? container.decode(String.self, forKey: .email)) ?? "0").data(using: .utf8)!)
            ).compactMap {
                String(format: "%02x", $0)
            }.joined()
        )
        self.balance = Float(try container.decode(String.self, forKey: .balance)) ?? -9999.99
    }
    
    // Init function, as straight-forward as it gets
    init(meteID: Int, displayName: String, displayImageURL: String, balance: Float) {
        self.meteID = meteID
        self.displayName = displayName
        self.displayImageURL = displayImageURL
        self.balance = balance
    }
}