import SwiftUI

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

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

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

                Text("Welcome Back")
                    .font(.title.bold())

                Text("Log in to save favorites and view your scan history.")
                    .font(.subheadline)
                    .foregroundColor(.secondary)
                    .multilineTextAlignment(.center)
                    .padding(.horizontal)

                // Form
                VStack(spacing: 16) {
                    TextField("Email", text: $email)
                        .keyboardType(.emailAddress)
                        .textContentType(.emailAddress)
                        .autocapitalization(.none)
                        .textFieldStyle(.roundedBorder)

                    SecureField("Password", text: $password)
                        .textContentType(.password)
                        .textFieldStyle(.roundedBorder)
                }
                .padding(.horizontal, 24)

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

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

                // Register Link
                HStack {
                    Text("Don't have an account?")
                        .foregroundColor(.secondary)
                    Button("Sign Up") {
                        dismiss()
                        appState.showRegisterSheet = true
                    }
                    .foregroundColor(.green)
                }
                .font(.subheadline)

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

    private var isValid: Bool {
        !email.isEmpty && email.contains("@") && !password.isEmpty
    }

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

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