//! Example: MCP Server using pmcp SDK
//!
//! This example demonstrates how to run the pmat MCP server using the pmcp Rust SDK.
//! The pmcp SDK provides a more idiomatic Rust interface for implementing MCP servers
//! with proper type safety and async support.
//!
//! Note: This example requires the pmcp crate and full MCP integration.
//! Currently serves as a reference implementation.
//!
//! # Usage
//!
//! ```bash
//! cargo run --example mcp_server_pmcp
//! ```
//!
//! Then connect with an MCP client:
//! ```bash
//! # Using npx
//! npx @modelcontextprotocol/inspector tcp://127.0.0.1:3000
//!
//! # Or use any MCP-compatible client
//! ```

use anyhow::Result;
use std::collections::HashMap;
use tracing::{info, Level};
use tracing_subscriber::FmtSubscriber;

#[tokio::main]
async fn main() -> Result<()> {
    // Initialize logging
    let subscriber = FmtSubscriber::builder()
        .with_max_level(Level::INFO)
        .finish();
    tracing::subscriber::set_global_default(subscriber)?;

    info!("MCP Server with pmcp SDK - Reference Implementation");
    info!("This example demonstrates the intended pmcp integration architecture");

    // For now, show the conceptual server setup
    let tools = create_tool_registry();
    info!("Would register {} MCP tools", tools.len());

    // Simulate server binding
    info!("Would bind to tcp://127.0.0.1:3000");
    info!("Would accept MCP client connections");
    info!("Connect with: npx @modelcontextprotocol/inspector tcp://127.0.0.1:3000");

    // Show tool list
    println!("\nAvailable MCP Tools:");
    for (name, description) in &tools {
        println!("  • {} - {}", name, description);
    }

    println!("\nNote: Full pmcp integration pending. This demonstrates the intended architecture.");
    println!("See docs/features/mcp-protocol.md for current MCP server usage:");
    println!("  pmat --mode mcp");

    Ok(())
}

/// Creates a registry of all pmat MCP tools
fn create_tool_registry() -> HashMap<String, String> {
    let mut tools = HashMap::new();

    // Analysis tools
    tools.insert(
        "analyze_complexity".to_string(),
        "Analyze code complexity metrics".to_string(),
    );
    tools.insert(
        "analyze_satd".to_string(),
        "Detect self-admitted technical debt".to_string(),
    );
    tools.insert(
        "analyze_dead_code".to_string(),
        "Find potentially dead code".to_string(),
    );
    tools.insert(
        "analyze_lint_hotspot".to_string(),
        "Find files with most lint violations".to_string(),
    );
    tools.insert(
        "analyze_duplicates".to_string(),
        "Detect duplicate code blocks".to_string(),
    );

    // Quality gate tools
    tools.insert(
        "quality_gate".to_string(),
        "Run comprehensive quality checks".to_string(),
    );
    tools.insert(
        "quality_gate_file".to_string(),
        "Run quality checks on specific file".to_string(),
    );

    // Refactoring tools
    tools.insert(
        "refactor_start".to_string(),
        "Start an automated refactoring session".to_string(),
    );
    tools.insert(
        "refactor_next_iteration".to_string(),
        "Continue refactoring iteration".to_string(),
    );
    tools.insert(
        "refactor_get_state".to_string(),
        "Get current refactoring state".to_string(),
    );
    tools.insert(
        "refactor_stop".to_string(),
        "Stop refactoring session".to_string(),
    );

    // Context analysis
    tools.insert(
        "deep_context".to_string(),
        "Perform deep context analysis".to_string(),
    );
    tools.insert(
        "generate_context".to_string(),
        "Generate project context".to_string(),
    );

    // Visualization
    tools.insert(
        "generate_dag".to_string(),
        "Generate dependency graph visualization".to_string(),
    );

    tools
}
