import SwiftUI
import Kingfisher

struct BusinessListView: View {
    @Binding var hasAutoSelected: Bool
    var onBusinessSelected: (Business) -> Void
    var onLogout: () -> Void

    @State private var businesses: [Business] = []
    @State private var isLoading = false
    @State private var errorMessage: String?

    var body: some View {
        NavigationStack {
            VStack {
                if isLoading {
                    Spacer()
                    ProgressView("Loading businesses...")
                    Spacer()
                } else if let error = errorMessage {
                    Spacer()
                    Text(error)
                        .foregroundColor(.errorRed)
                        .multilineTextAlignment(.center)
                        .padding()
                    addBusinessButton
                    Spacer()
                } else if businesses.isEmpty {
                    Spacer()
                    Text("No businesses found")
                        .foregroundColor(.secondary)
                    addBusinessButton
                    Spacer()
                } else {
                    List(businesses) { business in
                        Button {
                            onBusinessSelected(business)
                        } label: {
                            businessRow(business)
                        }
                        .buttonStyle(.plain)
                    }
                    .listStyle(.plain)

                    addBusinessButton
                }
            }
            .navigationTitle("Select Business")
            .toolbar {
                ToolbarItem(placement: .topBarTrailing) {
                    Button("Log Out") {
                        logout()
                    }
                }
            }
        }
        .onAppear {
            loadBusinesses()
        }
    }

    private func businessRow(_ business: Business) -> some View {
        HStack(spacing: 12) {
            if let ext = business.headerImageExtension, !ext.isEmpty {
                let baseDomain = Api.IS_DEV ? "https://dev.payfrit.com" : "https://biz.payfrit.com"
                let imageUrl = URL(string: "\(baseDomain)/uploads/businesses/\(business.businessId)/header.\(ext)")
                KFImage(imageUrl)
                    .resizable()
                    .placeholder {
                        Image(systemName: "building.2")
                            .font(.title2)
                            .foregroundColor(.secondary)
                    }
                    .scaledToFill()
                    .frame(width: 48, height: 48)
                    .clipShape(Circle())
            } else {
                Image(systemName: "building.2")
                    .font(.title2)
                    .foregroundColor(.secondary)
                    .frame(width: 48, height: 48)
            }

            VStack(alignment: .leading, spacing: 2) {
                Text(business.name)
                    .font(.body.weight(.medium))
                    .foregroundColor(.primary)
                Text("Tap to configure beacons")
                    .font(.caption)
                    .foregroundColor(.secondary)
            }

            Spacer()

            Image(systemName: "chevron.right")
                .foregroundColor(.secondary)
                .font(.caption)
        }
        .padding(.vertical, 4)
    }

    private var addBusinessButton: some View {
        Button {
            let baseDomain = Api.IS_DEV ? "https://dev.payfrit.com" : "https://biz.payfrit.com"
            if let url = URL(string: "\(baseDomain)/portal/index.html") {
                UIApplication.shared.open(url)
            }
        } label: {
            Text("Add Business via Portal")
                .font(.callout)
                .foregroundColor(.payfritGreen)
        }
        .padding()
    }

    private func loadBusinesses() {
        isLoading = true
        errorMessage = nil

        Task {
            do {
                let result = try await Api.shared.listBusinesses()
                businesses = result
                isLoading = false

                if businesses.count == 1 && !hasAutoSelected {
                    hasAutoSelected = true
                    onBusinessSelected(businesses[0])
                }
            } catch {
                isLoading = false
                errorMessage = error.localizedDescription
            }
        }
    }

    private func logout() {
        UserDefaults.standard.removeObject(forKey: "token")
        UserDefaults.standard.removeObject(forKey: "userId")
        UserDefaults.standard.removeObject(forKey: "firstName")
        Api.shared.setAuthToken(nil)
        onLogout()
    }
}