import SwiftUI

struct AccountScreen: View {
    @EnvironmentObject var appState: AppState
    @State private var showLogoutConfirm = false
    @State private var showDeleteConfirm = false
    @State private var isExporting = false

    var body: some View {
        NavigationStack {
            Group {
                if !appState.isAuthenticated {
                    // Not logged in
                    VStack(spacing: 20) {
                        Spacer()
                        Image(systemName: "person.crop.circle")
                            .font(.system(size: 80))
                            .foregroundColor(.gray)

                        Text("Your Account")
                            .font(.title2.bold())

                        Text("Log in to access your profile, export your data, and manage your account.")
                            .font(.subheadline)
                            .foregroundColor(.secondary)
                            .multilineTextAlignment(.center)
                            .padding(.horizontal, 40)

                        Button {
                            appState.showLoginSheet = true
                        } label: {
                            Text("Log In")
                                .font(.headline)
                                .foregroundColor(.black)
                                .frame(maxWidth: .infinity)
                                .padding()
                                .background(Color.green)
                                .cornerRadius(12)
                        }
                        .padding(.horizontal, 40)

                        Button {
                            appState.showRegisterSheet = true
                        } label: {
                            Text("Create Account")
                                .font(.headline)
                                .foregroundColor(.green)
                        }

                        Spacer()
                    }
                } else {
                    List {
                        // Profile Section
                        Section {
                            if let profile = appState.userProfile {
                                HStack(spacing: 16) {
                                    ZStack {
                                        Circle()
                                            .fill(Color.green.opacity(0.2))
                                            .frame(width: 60, height: 60)
                                        Text(profile.name.prefix(1).uppercased())
                                            .font(.title.bold())
                                            .foregroundColor(.green)
                                    }

                                    VStack(alignment: .leading, spacing: 4) {
                                        Text(profile.name)
                                            .font(.headline)
                                        Text(profile.email)
                                            .font(.subheadline)
                                            .foregroundColor(.secondary)
                                    }
                                }
                                .padding(.vertical, 8)
                            }
                        }

                        // Premium Section
                        Section {
                            if appState.isPremium {
                                HStack {
                                    Image(systemName: "star.fill")
                                        .foregroundColor(.yellow)
                                    Text("Premium Member")
                                        .font(.headline)
                                    Spacer()
                                    Text("Active")
                                        .foregroundColor(.green)
                                }
                            } else {
                                HStack {
                                    Image(systemName: "star")
                                        .foregroundColor(.yellow)
                                    VStack(alignment: .leading) {
                                        Text("Go Premium")
                                            .font(.headline)
                                        Text("Remove sponsored content")
                                            .font(.caption)
                                            .foregroundColor(.secondary)
                                    }
                                    Spacer()
                                    Image(systemName: "chevron.right")
                                        .foregroundColor(.secondary)
                                }
                            }
                        }

                        // Data Section
                        Section("Your Data") {
                            Button {
                                exportData()
                            } label: {
                                HStack {
                                    Image(systemName: "square.and.arrow.up")
                                    Text("Export Data")
                                    Spacer()
                                    if isExporting {
                                        ProgressView()
                                    }
                                }
                            }
                            .disabled(isExporting)
                        }

                        // Account Actions
                        Section {
                            Button {
                                showLogoutConfirm = true
                            } label: {
                                HStack {
                                    Image(systemName: "rectangle.portrait.and.arrow.right")
                                    Text("Log Out")
                                }
                            }

                            Button(role: .destructive) {
                                showDeleteConfirm = true
                            } label: {
                                HStack {
                                    Image(systemName: "trash")
                                    Text("Delete Account")
                                }
                            }
                        }

                        // App Info
                        Section("About") {
                            HStack {
                                Text("Version")
                                Spacer()
                                Text("1.0.0")
                                    .foregroundColor(.secondary)
                            }

                            Link(destination: URL(string: "https://food.payfrit.com/privacy")!) {
                                HStack {
                                    Text("Privacy Policy")
                                    Spacer()
                                    Image(systemName: "arrow.up.right")
                                        .font(.caption)
                                        .foregroundColor(.secondary)
                                }
                            }

                            Link(destination: URL(string: "https://food.payfrit.com/terms")!) {
                                HStack {
                                    Text("Terms of Service")
                                    Spacer()
                                    Image(systemName: "arrow.up.right")
                                        .font(.caption)
                                        .foregroundColor(.secondary)
                                }
                            }
                        }
                    }
                }
            }
            .navigationTitle("Account")
            .alert("Log Out", isPresented: $showLogoutConfirm) {
                Button("Cancel", role: .cancel) {}
                Button("Log Out", role: .destructive) {
                    logout()
                }
            } message: {
                Text("Are you sure you want to log out?")
            }
            .alert("Delete Account", isPresented: $showDeleteConfirm) {
                Button("Cancel", role: .cancel) {}
                Button("Delete", role: .destructive) {
                    deleteAccount()
                }
            } message: {
                Text("This action cannot be undone. All your data will be permanently deleted.")
            }
        }
    }

    private func logout() {
        Task {
            try? await APIService.shared.logout()
            await appState.clearAuth()
        }
    }

    private func deleteAccount() {
        Task {
            do {
                try await APIService.shared.deleteAccount()
                await appState.clearAuth()
            } catch {
                appState.showError(error.localizedDescription)
            }
        }
    }

    private func exportData() {
        isExporting = true
        Task {
            do {
                let url = try await APIService.shared.exportData()
                await MainActor.run {
                    isExporting = false
                    UIApplication.shared.open(url)
                }
            } catch {
                await MainActor.run {
                    isExporting = false
                    appState.showError(error.localizedDescription)
                }
            }
        }
    }
}