import SwiftUI

struct BeaconEditSheet: View {
    var onSaved: () -> Void

    @State private var name = ""
    @State private var uuid = ""
    @State private var isSaving = false
    @State private var error: String?
    @EnvironmentObject var appState: AppState
    @Environment(\.dismiss) private var dismiss

    var body: some View {
        NavigationStack {
            Form {
                Section("New Beacon") {
                    TextField("Name (e.g. Table 1 Beacon)", text: $name)
                    TextField("UUID (32 hex characters)", text: $uuid)
                        .textInputAutocapitalization(.characters)
                        .autocorrectionDisabled()
                        .font(.system(.body, design: .monospaced))
                }

                Section {
                    Text("The UUID should be a 32-character hexadecimal string that uniquely identifies this beacon. Example: 626C7565636861726D31000000000001")
                        .font(.caption)
                        .foregroundColor(.secondary)
                }

                if let error = error {
                    Section {
                        HStack {
                            Image(systemName: "exclamationmark.circle.fill")
                                .foregroundColor(.red)
                            Text(error)
                                .foregroundColor(.red)
                        }
                    }
                }
            }
            .navigationTitle("Add Beacon")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Cancel") { dismiss() }
                }
                ToolbarItem(placement: .confirmationAction) {
                    Button("Save") { save() }
                        .disabled(isSaving || name.isEmpty || uuid.isEmpty)
                }
            }
        }
    }

    private func save() {
        let trimmedName = name.trimmingCharacters(in: .whitespaces)
        let trimmedUUID = uuid.trimmingCharacters(in: .whitespaces)

        guard !trimmedName.isEmpty else {
            error = "Name is required"
            return
        }
        guard !trimmedUUID.isEmpty else {
            error = "UUID is required"
            return
        }

        isSaving = true
        error = nil
        Task {
            do {
                _ = try await APIService.shared.createBeacon(name: trimmedName, uuid: trimmedUUID)
                onSaved()
                dismiss()
            } catch let apiError as APIError where apiError == .unauthorized {
                await appState.handleUnauthorized()
            } catch {
                self.error = error.localizedDescription
            }
            isSaving = false
        }
    }
}