madhyamas-api 0.1.5

//! Phase 4 API handlers - Enterprise features, performance monitoring, and onboarding

use axum::{
    extract::{Path, Query, State},
    http::StatusCode,
    Json,
};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::Arc;

use crate::AppState;
use madhyamas_core::enterprise::{
    ApiKey, AuditEvent, JwtClaims, Permission, User, UserRole, UserStatus,
};

// ============== Stub Types ==============

/// Metrics snapshot (stub)
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Metrics {
    pub requests_total: u64,
    pub requests_success: u64,
    pub requests_failed: u64,
    pub avg_latency_ms: f64,
    pub requests_per_second: f64,
}

impl Default for Metrics {
    fn default() -> Self {
        Self {
            requests_total: 0,
            requests_success: 0,
            requests_failed: 0,
            avg_latency_ms: 0.0,
            requests_per_second: 0.0,
        }
    }
}

/// Metrics collector (stub)
#[derive(Debug, Default)]
pub struct MetricsCollector;

impl MetricsCollector {
    pub fn new() -> Self {
        Self
    }

    pub fn snapshot(&self) -> Metrics {
        Metrics::default()
    }
}

/// Health check status (stub)
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HealthCheck {
    pub healthy: bool,
    pub version: String,
    pub uptime_secs: u64,
    pub memory_usage_mb: u64,
    pub active_connections: u64,
    pub details: HashMap<String, String>,
}

impl Default for HealthCheck {
    fn default() -> Self {
        Self {
            healthy: true,
            version: env!("CARGO_PKG_VERSION").to_string(),
            uptime_secs: 0,
            memory_usage_mb: 0,
            active_connections: 0,
            details: HashMap::new(),
        }
    }
}

/// Role info (stub)
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Role {
    pub name: String,
    pub description: String,
    pub permissions: Vec<String>,
}

// ============================================================================
// Performance & Metrics Handlers
// ============================================================================

/// Get current metrics
pub async fn get_metrics(State(_state): State<Arc<AppState>>) -> Json<Metrics> {
    let collector = MetricsCollector::new();
    Json(collector.snapshot())
}

/// Get health check
pub async fn get_health_check(State(_state): State<Arc<AppState>>) -> Json<HealthCheck> {
    Json(HealthCheck {
        healthy: true,
        version: env!("CARGO_PKG_VERSION").to_string(),
        uptime_secs: 0,
        memory_usage_mb: 0,
        active_connections: 0,
        details: Default::default(),
    })
}

/// Performance stats response
#[derive(Debug, Serialize)]
pub struct PerformanceStatsResponse {
    pub metrics: Metrics,
    pub memory: MemoryInfoResponse,
    pub pool: PoolStatsResponse,
}

#[derive(Debug, Serialize)]
pub struct MemoryInfoResponse {
    pub used_bytes: u64,
    pub total_bytes: u64,
    pub usage_percent: f64,
}

#[derive(Debug, Serialize)]
pub struct PoolStatsResponse {
    pub total_connections: u64,
    pub idle_connections: u64,
    pub active_connections: u64,
    pub pending_requests: u64,
}

/// Get performance stats
pub async fn get_performance_stats(
    State(_state): State<Arc<AppState>>,
) -> Json<PerformanceStatsResponse> {
    Json(PerformanceStatsResponse {
        metrics: MetricsCollector::new().snapshot(),
        memory: MemoryInfoResponse {
            used_bytes: 0,
            total_bytes: 0,
            usage_percent: 0.0,
        },
        pool: PoolStatsResponse {
            total_connections: 0,
            idle_connections: 0,
            active_connections: 0,
            pending_requests: 0,
        },
    })
}

// ============================================================================
// Authentication Handlers
// ============================================================================

#[derive(Debug, Deserialize)]
pub struct LoginRequest {
    pub username: String,
    pub password: String,
}

#[derive(Debug, Serialize)]
pub struct LoginResponse {
    pub token: String,
    pub user: UserInfo,
    pub expires_at: i64,
}

#[derive(Debug, Serialize)]
pub struct UserInfo {
    pub id: String,
    pub username: String,
    pub email: String,
    pub role: String,
}

/// Login handler
pub async fn login(
    State(_state): State<Arc<AppState>>,
    Json(_req): Json<LoginRequest>,
) -> Result<Json<LoginResponse>, StatusCode> {
    // In a real implementation, validate credentials and generate JWT
    Err(StatusCode::NOT_IMPLEMENTED)
}

/// Logout handler
pub async fn logout(State(_state): State<Arc<AppState>>) -> StatusCode {
    StatusCode::OK
}

/// Get current user
pub async fn get_current_user(
    State(_state): State<Arc<AppState>>,
) -> Result<Json<UserInfo>, StatusCode> {
    Err(StatusCode::NOT_IMPLEMENTED)
}

/// Validate JWT token
pub async fn validate_token(
    State(_state): State<Arc<AppState>>,
    Json(_token): Json<String>,
) -> Result<Json<JwtClaims>, StatusCode> {
    Err(StatusCode::NOT_IMPLEMENTED)
}

// ============================================================================
// API Key Handlers
// ============================================================================

/// Get all API keys for current user
pub async fn get_api_keys(State(_state): State<Arc<AppState>>) -> Json<Vec<ApiKey>> {
    Json(Vec::new())
}

#[derive(Debug, Deserialize)]
pub struct CreateApiKeyRequest {
    pub name: String,
    pub expires_in_days: Option<i64>,
}

/// Create new API key
pub async fn create_api_key(
    State(_state): State<Arc<AppState>>,
    Json(_req): Json<CreateApiKeyRequest>,
) -> Result<Json<ApiKey>, StatusCode> {
    Err(StatusCode::NOT_IMPLEMENTED)
}

/// Revoke API key
pub async fn revoke_api_key(
    State(_state): State<Arc<AppState>>,
    Path(_key_id): Path<String>,
) -> StatusCode {
    StatusCode::OK
}

// ============================================================================
// User Management Handlers
// ============================================================================

/// Get all users
pub async fn get_users(State(_state): State<Arc<AppState>>) -> Json<Vec<User>> {
    Json(Vec::new())
}

/// Get user by ID
pub async fn get_user(
    State(_state): State<Arc<AppState>>,
    Path(_user_id): Path<String>,
) -> Result<Json<User>, StatusCode> {
    Err(StatusCode::NOT_FOUND)
}

#[derive(Debug, Deserialize)]
pub struct CreateUserRequest {
    pub username: String,
    pub email: String,
    pub password: String,
    pub role: UserRole,
}

/// Create user
pub async fn create_user(
    State(_state): State<Arc<AppState>>,
    Json(_req): Json<CreateUserRequest>,
) -> Result<Json<User>, StatusCode> {
    Err(StatusCode::NOT_IMPLEMENTED)
}

#[derive(Debug, Deserialize)]
pub struct UpdateUserRequest {
    pub email: Option<String>,
    pub role: Option<UserRole>,
    pub status: Option<UserStatus>,
}

/// Update user
pub async fn update_user(
    State(_state): State<Arc<AppState>>,
    Path(_user_id): Path<String>,
    Json(_req): Json<UpdateUserRequest>,
) -> Result<Json<User>, StatusCode> {
    Err(StatusCode::NOT_IMPLEMENTED)
}

/// Delete user
pub async fn delete_user(
    State(_state): State<Arc<AppState>>,
    Path(_user_id): Path<String>,
) -> StatusCode {
    StatusCode::OK
}

// ============================================================================
// RBAC Handlers
// ============================================================================

/// Get all roles
pub async fn get_roles(State(_state): State<Arc<AppState>>) -> Json<Vec<Role>> {
    Json(Vec::new())
}

/// Get all permissions
pub async fn get_permissions(State(_state): State<Arc<AppState>>) -> Json<Vec<Permission>> {
    Json(Vec::new())
}

#[derive(Debug, Deserialize)]
pub struct CheckPermissionRequest {
    pub user_id: String,
    pub permission: String,
    pub resource: Option<String>,
}

/// Check if user has permission
pub async fn check_permission(
    State(_state): State<Arc<AppState>>,
    Json(_req): Json<CheckPermissionRequest>,
) -> Json<bool> {
    Json(false)
}

// ============================================================================
// Audit Log Handlers
// ============================================================================

#[derive(Debug, Deserialize)]
pub struct AuditQuery {
    pub event_types: Option<String>,
    pub user_id: Option<String>,
    pub resource: Option<String>,
    pub success: Option<bool>,
    pub start_time: Option<i64>,
    pub end_time: Option<i64>,
    pub search: Option<String>,
    pub limit: Option<usize>,
    pub offset: Option<usize>,
}

/// Get audit events
pub async fn get_audit_events(
    State(_state): State<Arc<AppState>>,
    Query(_query): Query<AuditQuery>,
) -> Json<Vec<AuditEvent>> {
    Json(Vec::new())
}

/// Audit statistics
#[derive(Debug, Serialize)]
pub struct AuditStatsResponse {
    pub total_events: u64,
    pub events_today: u64,
    pub events_by_type: HashMap<String, u64>,
    pub top_users: Vec<String>,
    pub error_count: u64,
}

/// Get audit statistics
pub async fn get_audit_stats(State(_state): State<Arc<AppState>>) -> Json<AuditStatsResponse> {
    Json(AuditStatsResponse {
        total_events: 0,
        events_today: 0,
        events_by_type: Default::default(),
        top_users: Vec::new(),
        error_count: 0,
    })
}

/// Export audit events
pub async fn export_audit_events(
    State(_state): State<Arc<AppState>>,
    Query(_query): Query<AuditQuery>,
) -> Result<Json<Vec<AuditEvent>>, StatusCode> {
    Ok(Json(Vec::new()))
}

/// Clear audit events
pub async fn clear_audit_events(State(_state): State<Arc<AppState>>) -> StatusCode {
    StatusCode::OK
}

// ============================================================================
// Onboarding Handlers
// ============================================================================

#[derive(Debug, Serialize)]
pub struct OnboardingStatus {
    pub completed: bool,
    pub current_step: u32,
    pub total_steps: u32,
    pub steps: Vec<OnboardingStep>,
}

#[derive(Debug, Serialize)]
pub struct OnboardingStep {
    pub id: String,
    pub title: String,
    pub description: String,
    pub completed: bool,
    pub optional: bool,
}

/// Get onboarding status
pub async fn get_onboarding_status(State(_state): State<Arc<AppState>>) -> Json<OnboardingStatus> {
    Json(OnboardingStatus {
        completed: false,
        current_step: 1,
        total_steps: 5,
        steps: vec![
            OnboardingStep {
                id: "welcome".to_string(),
                title: "Welcome to Madhyamas".to_string(),
                description: "Get started with Madhyamas".to_string(),
                completed: false,
                optional: false,
            },
            OnboardingStep {
                id: "certificate".to_string(),
                title: "Install Certificate".to_string(),
                description: "Install the root CA certificate to intercept HTTPS traffic"
                    .to_string(),
                completed: false,
                optional: false,
            },
            OnboardingStep {
                id: "proxy".to_string(),
                title: "Configure Proxy".to_string(),
                description: "Set up your browser or app to use the proxy".to_string(),
                completed: false,
                optional: false,
            },
            OnboardingStep {
                id: "features".to_string(),
                title: "Explore Features".to_string(),
                description: "Learn about breakpoints, mocks, and more".to_string(),
                completed: false,
                optional: true,
            },
            OnboardingStep {
                id: "tips".to_string(),
                title: "Pro Tips".to_string(),
                description: "Tips and tricks for power users".to_string(),
                completed: false,
                optional: true,
            },
        ],
    })
}

#[derive(Debug, Deserialize)]
pub struct CompleteOnboardingStepRequest {
    pub step_id: String,
}

/// Complete onboarding step
pub async fn complete_onboarding_step(
    State(_state): State<Arc<AppState>>,
    Json(_req): Json<CompleteOnboardingStepRequest>,
) -> StatusCode {
    StatusCode::OK
}

/// Skip onboarding
pub async fn skip_onboarding(State(_state): State<Arc<AppState>>) -> StatusCode {
    StatusCode::OK
}

// ============================================================================
// Configuration Export/Import
// ============================================================================

/// Export all configuration
pub async fn export_config(State(_state): State<Arc<AppState>>) -> Json<serde_json::Value> {
    Json(serde_json::json!({
        "version": env!("CARGO_PKG_VERSION"),
        "exported_at": chrono::Utc::now().to_rfc3339(),
        "settings": {},
        "rules": {},
    }))
}

#[derive(Debug, Deserialize)]
pub struct ImportConfigRequest {
    pub config: serde_json::Value,
}

/// Import configuration
pub async fn import_config(
    State(_state): State<Arc<AppState>>,
    Json(_req): Json<ImportConfigRequest>,
) -> StatusCode {
    StatusCode::OK
}