import Foundation

/// Card-DTO. Wire-Format aus `cards/apps/api/src/lib/dto.ts:toCardDto`
/// und `cards/packages/cards-domain/src/schemas/card.ts`.
struct Card: Codable, Identifiable, Hashable, Sendable {
    let id: String
    let deckId: String
    let userId: String
    let type: CardType
    let fields: [String: String]
    let mediaRefs: [String]
    let contentHash: String?
    let createdAt: Date
    let updatedAt: Date

    enum CodingKeys: String, CodingKey {
        case id
        case deckId = "deck_id"
        case userId = "user_id"
        case type
        case fields
        case mediaRefs = "media_refs"
        case contentHash = "content_hash"
        case createdAt = "created_at"
        case updatedAt = "updated_at"
    }
}

/// Card-Type-Enum. Vollständig aus `CardTypeSchema`. In β-2 rendern
/// wir nur `basic`, `basic-reverse`, `cloze`. Die anderen Types
/// kommen in β-3 und β-4 dazu, sind aber jetzt schon decodierbar.
enum CardType: String, Codable, Sendable, CaseIterable {
    case basic
    case basicReverse = "basic-reverse"
    case cloze
    case imageOcclusion = "image-occlusion"
    case audioFront = "audio-front"
    case typing
    case multipleChoice = "multiple-choice"
}

/// Vereinfachtes Card-Sub-Objekt aus `/reviews/due?deck_id=X`-Response.
/// Server liefert nur 4 Felder (id, deckId, type, fields) als Drizzle-
/// Joined-Subset — Achtung: `deckId` hier in **camelCase**, nicht
/// snake_case wie sonst.
struct ReviewCard: Codable, Hashable, Sendable {
    let id: String
    let deckId: String
    let type: CardType
    let fields: [String: String]
}