//! Admin Integration Example
//!
//! Demonstrates configuration-driven admin functionality integration.
//! Shows how admin features are generated from TOML configuration rather than hardcoded.

use rustelo_client::{hydrate_with_config, ClientConfig, AdminConfig};

/// Configuration-Driven Admin Integration
///
/// This example shows how admin functionality is generated from TOML configuration
/// rather than manually creating admin routes and components.
fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("🎯 RUSTELO CLIENT ADMIN INTEGRATION EXAMPLE");
    println!("===========================================");
    println!();

    println!("This example demonstrates how admin functionality is generated");
    println!("from TOML configuration rather than manual component creation.");
    println!();

    demonstrate_toml_admin_config();
    println!();

    demonstrate_generated_admin_functionality();
    println!();

    demonstrate_admin_extensions();

    Ok(())
}

/// Step 1: TOML Configuration → Admin Features
///
/// Shows how admin functionality is defined in configuration files
fn demonstrate_toml_admin_config() {
    println!("📋 STEP 1: TOML CONFIGURATION → ADMIN FEATURES");
    println!("==============================================");
    println!();

    println!("📝 File: site/config/admin.toml");
    let admin_config = r#"
[admin]
enabled = true
base_path = "/admin"
require_auth = true
require_role = "admin"

[admin.features]
user_management = true
content_management = true
system_monitoring = true
analytics_dashboard = true
configuration_editor = false

[admin.routes]
dashboard = { path = "/admin/dashboard", component = "AdminDashboard" }
users = { path = "/admin/users", component = "UserManagement" }
content = { path = "/admin/content", component = "ContentManagement" }
monitoring = { path = "/admin/monitoring", component = "SystemMonitoring" }
analytics = { path = "/admin/analytics", component = "AnalyticsDashboard" }

[admin.permissions]
user_management = ["admin", "user_manager"]
content_management = ["admin", "content_editor"]
system_monitoring = ["admin", "system_operator"]
analytics_dashboard = ["admin", "analyst"]

[admin.theme]
layout = "admin_sidebar"
color_scheme = "dark"
navigation_style = "collapsible"
"#;

    println!("{}", admin_config);
    println!();

    println!("⚙️  Generated Admin Features:");
    println!("   • AdminProvider (auth + role checking)");
    println!("   • AdminRouter (5 configured routes)");
    println!("   • AdminLayout (dark theme, collapsible nav)");
    println!("   • Permission guards (role-based access)");
    println!("   • Admin components (generated from routes)");
}

/// Step 2: Generated Admin Functionality
///
/// Shows what gets generated automatically from the admin TOML configuration
fn demonstrate_generated_admin_functionality() {
    println!("🏗️ STEP 2: GENERATED ADMIN FUNCTIONALITY");
    println!("=======================================");
    println!();

    println!("📦 Generated Admin Code (from admin.toml):");

    let generated_example = r#"
// Generated from your admin.toml configuration
#[wasm_bindgen]
pub fn hydrate_admin_app() {
    let admin_config = AdminConfig::from_toml();

    // Only generate admin features if enabled in config
    if admin_config.enabled {
        let client_config = ClientConfig::builder()
            .with_admin_features(admin_config)
            .build();

        rustelo_client::hydrate_with_config(client_config);
    } else {
        // No admin features - regular hydration only
        rustelo_client::hydrate();
    }
}

// Generated admin provider from configuration
#[component]
pub fn GeneratedAdminProvider(children: Children) -> impl IntoView {
    let auth = use_auth_state();

    // Permission checking based on admin.toml config
    let has_admin_access = create_memo(move |_| {
        let user = auth.current_user();
        user.map(|u| admin_config.check_permission(&u.role))
            .unwrap_or(false)
    });

    view! {
        <AdminContextProvider has_access=has_admin_access>
            {children()}
        </AdminContextProvider>
    }
}

// Generated admin routing from admin.routes configuration
fn generate_admin_routes() -> Vec<AdminRoute> {
    vec![
        AdminRoute::new("/admin/dashboard", AdminDashboard, vec!["admin"]),
        AdminRoute::new("/admin/users", UserManagement, vec!["admin", "user_manager"]),
        AdminRoute::new("/admin/content", ContentManagement, vec!["admin", "content_editor"]),
        AdminRoute::new("/admin/monitoring", SystemMonitoring, vec!["admin", "system_operator"]),
        AdminRoute::new("/admin/analytics", AnalyticsDashboard, vec!["admin", "analyst"]),
    ]
}
"#;

    println!("{}", generated_example);
    println!();

    println!("🎯 Client Hydration with Admin Features:");
    let client_usage = r#"
#[wasm_bindgen]
pub fn hydrate() {
    // Admin functionality generated from TOML configuration
    let config = ClientConfig::from_generated_admin_config();

    // Hydrate with admin features if user has permissions
    rustelo_client::hydrate_with_config(config);
}

// Usage in your application components
#[component]
pub fn App() -> impl IntoView {
    view! {
        // Generated admin provider handles all permission logic
        <GeneratedAdminProvider>
            // Regular app content
            <MainContent />

            // Admin features automatically available if configured
            <AdminNavigation />  // Only shows if user has admin role
            <AdminDashboard />   // Only accessible with proper permissions
        </GeneratedAdminProvider>
    }
}
"#;

    println!("{}", client_usage);
}

/// Step 3: Admin Extensions (10% Custom Code)
///
/// Shows how to extend generated admin functionality with custom features
fn demonstrate_admin_extensions() {
    println!("🔧 STEP 3: ADMIN EXTENSIONS (10% CUSTOM)");
    println!("========================================");
    println!();

    println!("For complex admin requirements beyond TOML configuration:");
    println!();

    let extension_example = r#"
// Custom admin extension for complex business logic
use rustelo_client::{AdminExtension, CustomAdminFeatures};

#[wasm_bindgen]
pub fn hydrate_with_custom_admin() {
    // Foundation provides 90% from admin.toml
    let base_config = ClientConfig::from_admin_toml();

    // Add 10% custom admin functionality
    let extended_config = base_config
        .extend_with_custom_admin_features(CustomAdminFeatures {
            advanced_user_analytics: AdvancedUserAnalytics::new(),
            real_time_monitoring: RealTimeSystemMonitoring::new(),
            custom_reporting: CustomReportingDashboard::new(),
            audit_trail_visualization: AuditTrailVisualizer::new(),
        })
        .with_custom_admin_layout(CustomAdminLayout::new())
        .with_advanced_permissions(CustomPermissionEngine::new());

    rustelo_client::hydrate_with_config(extended_config);
}

// Custom admin component that extends generated functionality
#[component]
pub fn AdvancedAdminDashboard() -> impl IntoView {
    // Use generated base admin component (90%)
    let base_dashboard = rustelo_client::get_generated_admin_component("AdminDashboard");

    // Add custom real-time features (10%)
    let (realtime_metrics, set_realtime_metrics) = create_signal(Vec::new());
    let (system_alerts, set_system_alerts) = create_signal(Vec::new());

    // Custom WebSocket connection for real-time admin data
    create_effect(move |_| {
        spawn_local(async move {
            if let Ok(admin_stream) = connect_to_admin_monitoring().await {
                while let Some(update) = admin_stream.next().await {
                    match update {
                        AdminUpdate::SystemMetrics(metrics) => {
                            set_realtime_metrics.set(metrics);
                        }
                        AdminUpdate::SecurityAlert(alert) => {
                            set_system_alerts.update(|alerts| alerts.push(alert));
                        }
                        AdminUpdate::UserActivity(activity) => {
                            update_user_activity_dashboard(activity);
                        }
                    }
                }
            }
        });
    });

    // Custom admin audit trail
    create_effect(move |_| {
        spawn_local(async move {
            // Track admin actions for compliance
            if let Ok(actions) = fetch_admin_audit_trail().await {
                update_audit_visualization(actions);
            }
        });
    });

    view! {
        <div class="advanced-admin-dashboard">
            // Base admin functionality (90% from configuration)
            {base_dashboard}

            // Custom extensions (10% when configuration isn't sufficient)
            <RealTimeSystemMonitoring metrics=realtime_metrics />
            <SecurityAlertsPanel alerts=system_alerts />
            <AdvancedUserAnalytics />
            <AuditTrailVisualizer />
            <CustomReportingTools />
        </div>
    }
}

// Custom admin permission system for complex requirements
#[component]
pub fn CustomAdminGuard(
    required_permissions: Vec<String>,
    children: Children
) -> impl IntoView {
    let auth = use_auth_state();
    let admin_context = use_admin_context();

    // Complex permission logic that can't be expressed in TOML
    let has_permission = create_memo(move |_| {
        let user = auth.current_user()?;
        let admin_data = admin_context.get_admin_data()?;

        // Custom business logic for permissions
        check_complex_admin_permissions(&user, &admin_data, &required_permissions)
    });

    view! {
        {move || {
            if has_permission.get() {
                children().into_any()
            } else {
                view! {
                    <div class="access-denied">
                        <h3>"Access Denied"</h3>
                        <p>"Insufficient permissions for this admin feature."</p>
                    </div>
                }.into_any()
            }
        }}
    }
}

// Build-time extension for generating custom admin code
#[cfg(feature = "build-extensions")]
pub struct CustomAdminExtension;

impl AdminBuildExtension for CustomAdminExtension {
    fn name(&self) -> &str {
        "custom-admin-features"
    }

    fn generate_admin_code(&self, admin_config: &AdminConfig) -> Result<String, String> {
        let custom_code = format!(r#"
            // Generated custom admin integration
            #[wasm_bindgen]
            pub fn initialize_custom_admin_features() {{
                setup_admin_websocket_connection("{}");
                register_admin_keyboard_shortcuts();
                initialize_admin_audit_logging();
                setup_admin_theme_customization();
            }}

            #[wasm_bindgen]
            pub fn get_admin_feature_config() -> JsValue {{
                let config = CustomAdminConfig {{
                    realtime_monitoring: {},
                    advanced_analytics: {},
                    audit_trail: {},
                    custom_reporting: {},
                }};

                serde_wasm_bindgen::to_value(&config).unwrap()
            }}
        "#,
            admin_config.websocket_endpoint.unwrap_or("ws://localhost:8080/admin".to_string()),
            admin_config.features.contains("realtime_monitoring"),
            admin_config.features.contains("advanced_analytics"),
            admin_config.features.contains("audit_trail"),
            admin_config.features.contains("custom_reporting")
        );

        Ok(custom_code)
    }
}
"#;

    println!("{}", extension_example);

    println!();
    println!("💡 Key Admin Integration Principles:");
    println!("   • Admin features defined in admin.toml configuration (90%)");
    println!("   • Automatic generation of admin routes, components, and permissions");
    println!("   • Role-based access control from configuration");
    println!("   • Admin theme and layout from configuration");
    println!("   • Custom extensions for complex admin requirements (10%)");
    println!("   • Build-time generation of admin-specific code");
    println!();

    println!("⚖️ When to Use Admin Extensions:");
    println!("   ✅ Real-time monitoring and alerts");
    println!("   ✅ Advanced analytics and reporting");
    println!("   ✅ Custom audit trail visualization");
    println!("   ✅ Complex permission systems");
    println!("   ✅ Third-party admin tool integration");
    println!();

    println!("❌ When NOT to Use Extensions:");
    println!("   ❌ Basic CRUD operations (use configuration)");
    println!("   ❌ Standard admin navigation (use admin.toml)");
    println!("   ❌ Simple role-based permissions (use configuration)");
    println!("   ❌ Basic admin theming (use admin.theme in TOML)");
}

// Supporting types and mock implementations for the example

#[derive(Clone, Debug)]
struct AdminConfig {
    enabled: bool,
    base_path: String,
    require_auth: bool,
    require_role: String,
    features: std::collections::HashSet<String>,
    websocket_endpoint: Option<String>,
}

impl AdminConfig {
    fn from_toml() -> Self {
        Self {
            enabled: true,
            base_path: "/admin".to_string(),
            require_auth: true,
            require_role: "admin".to_string(),
            features: ["user_management", "content_management", "system_monitoring", "analytics_dashboard"]
                .iter().map(|s| s.to_string()).collect(),
            websocket_endpoint: Some("ws://localhost:8080/admin".to_string()),
        }
    }

    fn check_permission(&self, role: &str) -> bool {
        role == "admin" || role == "system_operator"
    }
}

#[derive(Clone, Debug)]
struct AdminRoute {
    path: String,
    component: String,
    required_roles: Vec<String>,
}

impl AdminRoute {
    fn new(path: &str, component: impl ToString, roles: Vec<&str>) -> Self {
        Self {
            path: path.to_string(),
            component: component.to_string(),
            required_roles: roles.iter().map(|s| s.to_string()).collect(),
        }
    }
}

// Mock component names for the example
struct AdminDashboard;
struct UserManagement;
struct ContentManagement;
struct SystemMonitoring;
struct AnalyticsDashboard;

impl ToString for AdminDashboard { fn to_string(&self) -> String { "AdminDashboard".to_string() }}
impl ToString for UserManagement { fn to_string(&self) -> String { "UserManagement".to_string() }}
impl ToString for ContentManagement { fn to_string(&self) -> String { "ContentManagement".to_string() }}
impl ToString for SystemMonitoring { fn to_string(&self) -> String { "SystemMonitoring".to_string() }}
impl ToString for AnalyticsDashboard { fn to_string(&self) -> String { "AnalyticsDashboard".to_string() }}

// Mock structures for custom extensions
struct CustomAdminFeatures {
    advanced_user_analytics: AdvancedUserAnalytics,
    real_time_monitoring: RealTimeSystemMonitoring,
    custom_reporting: CustomReportingDashboard,
    audit_trail_visualization: AuditTrailVisualizer,
}

struct AdvancedUserAnalytics;
struct RealTimeSystemMonitoring;
struct CustomReportingDashboard;
struct AuditTrailVisualizer;
struct CustomAdminLayout;
struct CustomPermissionEngine;

impl AdvancedUserAnalytics { fn new() -> Self { Self }}
impl RealTimeSystemMonitoring { fn new() -> Self { Self }}
impl CustomReportingDashboard { fn new() -> Self { Self }}
impl AuditTrailVisualizer { fn new() -> Self { Self }}
impl CustomAdminLayout { fn new() -> Self { Self }}
impl CustomPermissionEngine { fn new() -> Self { Self }}

// Mock types for admin updates
#[derive(Clone, Debug)]
enum AdminUpdate {
    SystemMetrics(Vec<SystemMetric>),
    SecurityAlert(SecurityAlert),
    UserActivity(UserActivity),
}

#[derive(Clone, Debug)]
struct SystemMetric {
    name: String,
    value: f64,
    timestamp: u64,
}

#[derive(Clone, Debug)]
struct SecurityAlert {
    severity: String,
    message: String,
    timestamp: u64,
}

#[derive(Clone, Debug)]
struct UserActivity {
    user_id: String,
    action: String,
    timestamp: u64,
}

#[derive(Clone, Debug)]
struct CustomAdminConfig {
    realtime_monitoring: bool,
    advanced_analytics: bool,
    audit_trail: bool,
    custom_reporting: bool,
}

// Mock function implementations
async fn connect_to_admin_monitoring() -> Result<AdminStream, String> { Ok(AdminStream) }
async fn fetch_admin_audit_trail() -> Result<Vec<AdminAction>, String> { Ok(vec![]) }
fn update_audit_visualization(_actions: Vec<AdminAction>) {}
fn update_user_activity_dashboard(_activity: UserActivity) {}
fn check_complex_admin_permissions(_user: &User, _admin_data: &AdminData, _permissions: &[String]) -> Option<bool> { Some(true) }

struct AdminStream;
impl AdminStream {
    async fn next(&mut self) -> Option<AdminUpdate> { None }
}

struct AdminAction;
struct User;
struct AdminData;

trait AdminBuildExtension {
    fn name(&self) -> &str;
    fn generate_admin_code(&self, admin_config: &AdminConfig) -> Result<String, String>;
}
