#!/usr/bin/env -S cargo run --
//! Simple Rust-native MCP Server for Provisioning
//! 
//! A minimal working implementation that shows Rust feasibility

use anyhow::Result;
use clap::Parser;
use std::path::PathBuf;
use tracing::{info, error, debug};
use serde_json::json;

mod config;
mod provisioning;  
mod tools;
mod errors;

use config::Config;
use provisioning::ProvisioningEngine;
use tools::ProvisioningTools;

#[derive(Parser, Debug)]
#[command(name = "provisioning-mcp-server")]
#[command(about = "Rust-native MCP server for Cloud Native Provisioning")]
#[command(version)]
struct Args {
    /// Configuration file path
    #[arg(short, long, env = "PROVISIONING_MCP_CONFIG")]
    config: Option<PathBuf>,
    
    /// Provisioning system path
    #[arg(short, long, env = "PROVISIONING_PATH")]
    provisioning_path: Option<PathBuf>,
    
    /// Debug mode
    #[arg(short, long, env = "PROVISIONING_DEBUG")]
    debug: bool,
}

#[tokio::main]
async fn main() -> Result<()> {
    let args = Args::parse();
    
    // Initialize tracing
    tracing_subscriber::fmt()
        .with_max_level(if args.debug { 
            tracing::Level::DEBUG 
        } else { 
            tracing::Level::INFO 
        })
        .init();

    info!("🦀 Starting Rust-native MCP Server for Provisioning");

    // Load configuration
    let config = Config::load(
        args.config,
        args.provisioning_path,
        args.debug,
    )?;

    info!("Configuration loaded successfully");
    info!("Provisioning path: {}", config.provisioning_path.display());
    info!("AI enabled: {}", config.is_ai_available());

    // Initialize components
    let engine = ProvisioningEngine::new(&config)?;
    let tools = ProvisioningTools::new(&config);

    info!("🚀 MCP Server components initialized");

    // Run basic tests to verify functionality
    test_components(&engine, &tools).await?;

    // Run performance tests
    info!("⚡ Running performance benchmarks...");
    let performance_results = provisioning_mcp_server::performance_test::run_performance_tests();
    println!("\n{}", performance_results);

    info!("✅ Rust MCP Server validation complete");
    Ok(())
}

async fn test_components(engine: &ProvisioningEngine, tools: &ProvisioningTools) -> Result<()> {
    info!("🧪 Testing server components...");

    // Test configuration parsing
    let test_description = "Create 2 servers with 4 CPU cores for kubernetes cluster on AWS";
    match tools.parse_server_description(test_description) {
        Ok(server_json) => {
            info!("✅ Server parsing test passed");
            info!("   Parsed: {} x {} servers for {}",
                  server_json.get("count").and_then(|v| v.as_u64()).unwrap_or(1),
                  server_json.get("instance_type").and_then(|v| v.as_str()).unwrap_or("unknown"),
                  server_json.get("purpose").and_then(|v| v.as_str()).unwrap_or("general"));
        }
        Err(e) => {
            error!("❌ Server parsing test failed: {}", e);
        }
    }

    // Test AI status
    let ai_status = tools.get_ai_status()?;
    info!("🤖 AI Status:\n{}", ai_status);

    // Test basic infrastructure status
    match engine.get_status(None, false) {
        Ok(status) => {
            info!("✅ Infrastructure status test passed");
            debug!("Status: {}", status);
        }
        Err(e) => {
            info!("ℹ️ Infrastructure status (expected if no infrastructure exists): {}", e);
        }
    }

    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn test_server_creation() {
        let config = Config::default();
        let engine = ProvisioningEngine::new(&config).expect("Failed to create engine");
        let tools = ProvisioningTools::new(&config);
        
        // Test parsing
        let result = tools.parse_server_description("Create 1 server for web hosting");
        assert!(result.is_ok());
        
        let server_config = result.unwrap();
        assert_eq!(server_config.count, 1);
    }

    #[test]
    fn test_config_loading() {
        let config = Config::default();
        assert!(!config.debug);
        assert!(config.provisioning_path.exists() || !config.provisioning_path.to_string_lossy().contains("/usr/local/provisioning"));
    }
}