import SwiftUI
import SwiftData

struct LeadDetailScreen: View {
    @State private var model: LeadDetailViewModel
    @State private var retryID = 0
    @Environment(\.dismiss) private var dismiss
    private let leadID: String
    private let salesCode: String
    private let repository: any LeadDetailRepository
    let onLogout: () -> Void

    init(leadID: String, salesCode: String, repository: any LeadDetailRepository,
         onLogout: @escaping () -> Void) {
        self.leadID = leadID
        self.salesCode = salesCode
        self.repository = repository
        _model = State(initialValue: LeadDetailViewModel(
            leadID: leadID, salesCode: salesCode, repository: repository
        ))
        self.onLogout = onLogout
    }

    var body: some View {
        @Bindable var model = model
        ZStack {
            if let error = model.error {
                ContentUnavailableView {
                    Label("Interessent konnte nicht geladen werden", systemImage: "exclamationmark.triangle")
                } description: {
                    Text(error.message)
                } actions: {
                    if error == .unauthorized {
                        Button("Erneut anmelden", action: onLogout)
                    } else if error.allowsRetry {
                        Button("Erneut versuchen") { retryID += 1 }
                    }
                    Button("Zur Übersicht") { dismiss() }
                }
            } else if let detail = model.detail {
                LeadDetailView(detail: detail, model: model, salesCode: salesCode,
                               repository: repository, onLogout: onLogout)
            } else {
                LeadDetailSkeletonView()
            }
        }
        .navigationTitle("")
        .navigationBarTitleDisplayMode(.inline)
        .tint(LeadDetailStyle.blue)
        .toolbar {
            ToolbarItem(placement: .principal) {
                HStack(spacing: 8) {
                    Image("LoginLogo")
                        .resizable()
                        .scaledToFit()
                        .frame(width: 30, height: 30)
                        .clipShape(.rect(cornerRadius: 8))
                        .accessibilityHidden(true)
                    Text("DrachenGas")
                        .font(.headline)
                        .foregroundStyle(LeadDetailStyle.blue)
                }
                .accessibilityElement(children: .combine)
            }
            if model.detail == nil && model.error == nil {
                ToolbarItem(placement: .topBarTrailing) {
                    ProgressView().accessibilityLabel("Interessent wird geladen")
                }
            }
        }
        .sheet(item: $model.selectedDocument) { document in
            LeadPDFPreview(document: document, leadID: leadID, salesCode: salesCode,
                          repository: repository, onLogout: onLogout,
                          signedURL: model.signedDocumentURLs[document.id])
        }
        .sheet(item: $model.signingRequest) { request in
            LeadSigningSheet(request: request, leadID: leadID, salesCode: salesCode,
                             repository: repository, onSigned: model.didSign)
        }
        .modelContainer(for: [Project.self, LeadARProjectLink.self])
        .task(id: retryID) { await model.load() }
    }
}

#Preview("Interessent", traits: .fixedLayout(width: 1194, height: 834)) {
    NavigationStack {
        LeadDetailScreen(leadID: "L-240318", salesCode: "MKR",
                         repository: DefaultLeadDetailRepository(
                            remoteService: StubLeadDetailRemoteService(delay: .zero)),
                         onLogout: {})
    }
}

#Preview("Ladezustand", traits: .fixedLayout(width: 1194, height: 834)) {
    NavigationStack {
        LeadDetailSkeletonView().navigationTitle("")
    }
}