import ManaCore
import SwiftData
import SwiftUI

struct PendingShareRoute: Hashable {
    let share: PendingShare
}

/// User wählt Ziel-Deck, optional Back-Text. Submit → CardCreate
/// via API, anschließend wird die PendingShare aus dem Store entfernt.
struct PendingShareConsumeView: View {
    let share: PendingShare
    let onDone: () -> Void

    @Environment(AuthClient.self) private var auth
    @Environment(\.dismiss) private var dismiss
    @Query(sort: \CachedDeck.updatedAt, order: .reverse) private var decks: [CachedDeck]

    @State private var selectedDeckId: String?
    @State private var front: String
    @State private var back: String = ""
    @State private var isSubmitting = false
    @State private var errorMessage: String?

    init(share: PendingShare, onDone: @escaping () -> Void) {
        self.share = share
        self.onDone = onDone
        _front = State(initialValue: share.text)
    }

    var body: some View {
        Form {
            Section("Ziel-Deck") {
                if decks.isEmpty {
                    Text("Erst ein Deck erstellen.")
                        .foregroundStyle(CardsTheme.mutedForeground)
                } else {
                    Picker("Deck", selection: $selectedDeckId) {
                        Text("Wählen …").tag(String?.none)
                        ForEach(decks) { deck in
                            Text(deck.name).tag(String?.some(deck.id))
                        }
                    }
                }
            }
            Section("Vorderseite") {
                TextField("Front", text: $front, axis: .vertical)
                    .lineLimit(2 ... 6)
            }
            Section("Rückseite") {
                TextField("Back (optional, default: Quell-URL)", text: $back, axis: .vertical)
                    .lineLimit(2 ... 4)
            }
            if let sourceURL = share.sourceURL {
                Section("Quelle") {
                    Text(sourceURL)
                        .font(.caption)
                        .foregroundStyle(CardsTheme.mutedForeground)
                }
            }
            if let errorMessage {
                Section {
                    Text(errorMessage)
                        .font(.footnote)
                        .foregroundStyle(CardsTheme.error)
                }
            }
        }
        .navigationTitle("Geteilten Inhalt speichern")
        #if os(iOS)
            .navigationBarTitleDisplayMode(.inline)
        #endif
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Verwerfen", role: .destructive) {
                        PendingShareStore.remove(id: share.id)
                        onDone()
                        dismiss()
                    }
                }
                ToolbarItem(placement: .confirmationAction) {
                    Button("Speichern") { Task { await submit() } }
                        .disabled(selectedDeckId == nil || front.trimmed.isEmpty || isSubmitting)
                }
            }
    }

    private func submit() async {
        guard let deckId = selectedDeckId else { return }
        isSubmitting = true
        errorMessage = nil
        defer { isSubmitting = false }

        let backText = back.trimmed.isEmpty ? (share.sourceURL ?? "—") : back.trimmed
        let api = CardsAPI(auth: auth)
        let body = CardCreateBody(
            deckId: deckId,
            type: .basic,
            fields: CardFieldsBuilder.basic(front: front.trimmed, back: backText),
            mediaRefs: nil
        )
        do {
            _ = try await api.createCard(body)
            onDone()
            dismiss()
        } catch {
            errorMessage = (error as? LocalizedError)?.errorDescription ?? String(describing: error)
        }
    }
}

private extension String {
    var trimmed: String {
        trimmingCharacters(in: .whitespacesAndNewlines)
    }
}