import ManaCore
import SwiftUI

/// Liste der vom User blockierten Marketplace-Authors. Entblock-Action
/// per Swipe — analog zur iOS-Mail-Inbox.
///
/// App-Store-Guideline 5.1.1(v) verlangt: Block-Mechanismus für UGC
/// muss verwaltbar sein. Diese View ist der Verwaltungs-Endpunkt.
struct BlockedAuthorsView: View {
    @Environment(AuthClient.self) private var auth

    @State private var blocks: [BlockEntry] = []
    @State private var isLoading = false
    @State private var errorMessage: String?

    var body: some View {
        ZStack {
            CardsTheme.background.ignoresSafeArea()
            content
        }
        .navigationTitle("Blockierte Authors")
        #if os(iOS)
            .navigationBarTitleDisplayMode(.inline)
        #endif
            .task { await load() }
            .refreshable { await load() }
    }

    @ViewBuilder
    private var content: some View {
        if isLoading, blocks.isEmpty {
            ProgressView().tint(CardsTheme.primary)
        } else if blocks.isEmpty {
            ContentUnavailableView(
                "Keine blockierten Authors",
                systemImage: "hand.raised.slash",
                description: Text("Blockiere Authors über das Menü oben rechts auf Marketplace-Decks.")
            )
            .foregroundStyle(CardsTheme.mutedForeground)
        } else {
            List {
                ForEach(blocks) { block in
                    VStack(alignment: .leading, spacing: 2) {
                        Text(block.displayName)
                            .font(.subheadline.weight(.semibold))
                        Text("@\(block.authorSlug)")
                            .font(.caption)
                            .foregroundStyle(CardsTheme.mutedForeground)
                    }
                    .swipeActions {
                        Button("Entblocken") {
                            Task { await unblock(block) }
                        }
                        .tint(CardsTheme.primary)
                    }
                }
            }
            .listStyle(.plain)
            .scrollContentBackground(.hidden)
            if let errorMessage {
                Text(errorMessage)
                    .font(.caption)
                    .foregroundStyle(CardsTheme.error)
                    .padding(.horizontal, 16)
            }
        }
    }

    private func load() async {
        isLoading = true
        defer { isLoading = false }
        let api = CardsAPI(auth: auth)
        do {
            blocks = try await api.myBlocks()
        } catch {
            errorMessage = (error as? LocalizedError)?.errorDescription ?? String(describing: error)
        }
    }

    private func unblock(_ block: BlockEntry) async {
        let api = CardsAPI(auth: auth)
        do {
            try await api.unblockAuthor(slug: block.authorSlug)
            blocks.removeAll { $0.id == block.id }
        } catch {
            errorMessage = (error as? LocalizedError)?.errorDescription ?? String(describing: error)
        }
    }
}