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

import Foundation
import CryptoKit

/// **MeteClientUser** resembles a user retrieved from Space Market API, Version 1. Pure Swift, no platform-specific frameworks used.
struct MeteClientUser: Decodable, Identifiable, Hashable {
    let id: UUID = UUID() // Careful: meterios-internal ID, not Mete/Backend user accoint ID!
    let meteID: Int
    let displayName: String
    let displayImageURL: URL?
    let 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 = URL(string: String(
            format: "https://secure.gravatar.com/avatar/%@?s=300",
            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))
    }
    
    // Init function, as straight-forward as it gets
    init(meteID: Int, displayName: String, displayImageURL: URL?, balance: Float) {
        self.meteID = meteID
        self.displayName = displayName
        self.displayImageURL = displayImageURL
        self.balance = balance
    }
}