import SwiftUI

struct RegisterSheet: View {
    @EnvironmentObject var appState: AppState
    @Environment(\.dismiss) private var dismiss

    @State private var name = ""
    @State private var email = ""
    @State private var password = ""
    @State private var zipCode = ""
    @State private var isLoading = false
    @State private var error: String?

    var body: some View {
        NavigationStack {
            ScrollView {
                VStack(spacing: 24) {
                    // Logo
                    Image(systemName: "leaf.circle.fill")
                        .font(.system(size: 60))
                        .foregroundColor(.green)
                        .padding(.top, 40)

                    Text("Create Account")
                        .font(.title.bold())

                    Text("Sign up to save favorites, track your scan history, and get personalized recommendations.")
                        .font(.subheadline)
                        .foregroundColor(.secondary)
                        .multilineTextAlignment(.center)
                        .padding(.horizontal)

                    // Form
                    VStack(spacing: 16) {
                        TextField("Name", text: $name)
                            .textContentType(.name)
                            .textFieldStyle(.roundedBorder)

                        TextField("Email", text: $email)
                            .keyboardType(.emailAddress)
                            .textContentType(.emailAddress)
                            .autocapitalization(.none)
                            .textFieldStyle(.roundedBorder)

                        SecureField("Password", text: $password)
                            .textContentType(.newPassword)
                            .textFieldStyle(.roundedBorder)

                        TextField("ZIP Code", text: $zipCode)
                            .keyboardType(.numberPad)
                            .textContentType(.postalCode)
                            .textFieldStyle(.roundedBorder)

                        Text("We use your ZIP code to find stores near you.")
                            .font(.caption)
                            .foregroundColor(.secondary)
                    }
                    .padding(.horizontal, 24)

                    if let error = error {
                        Text(error)
                            .font(.caption)
                            .foregroundColor(.red)
                    }

                    // Register Button
                    Button {
                        register()
                    } label: {
                        if isLoading {
                            ProgressView()
                                .tint(.black)
                        } else {
                            Text("Create Account")
                                .font(.headline)
                        }
                    }
                    .foregroundColor(.black)
                    .frame(maxWidth: .infinity)
                    .padding()
                    .background(isValid ? Color.green : Color.gray)
                    .cornerRadius(12)
                    .disabled(!isValid || isLoading)
                    .padding(.horizontal, 24)

                    // Login Link
                    HStack {
                        Text("Already have an account?")
                            .foregroundColor(.secondary)
                        Button("Log In") {
                            dismiss()
                            appState.showLoginSheet = true
                        }
                        .foregroundColor(.green)
                    }
                    .font(.subheadline)

                    Spacer(minLength: 40)
                }
            }
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .navigationBarLeading) {
                    Button("Cancel") {
                        dismiss()
                    }
                }
            }
        }
    }

    private var isValid: Bool {
        !name.isEmpty && !email.isEmpty && email.contains("@") && password.count >= 6 && zipCode.count >= 5
    }

    private func register() {
        isLoading = true
        error = nil

        Task {
            do {
                let (profile, token) = try await APIService.shared.register(
                    email: email,
                    password: password,
                    name: name,
                    zipCode: zipCode
                )
                await appState.setAuth(userId: profile.id, token: token, profile: profile)
                await MainActor.run {
                    dismiss()
                }
            } catch {
                await MainActor.run {
                    self.error = error.localizedDescription
                    isLoading = false
                }
            }
        }
    }
}