use anyhow::Result;
use axum::{
    Router,
    routing::post,
};
use clap::Command;
use log::{debug, info};
use std::net::SocketAddr;
use std::path::PathBuf;
use std::sync::Arc;
use tokio::sync::Mutex;
use tower_http::cors::CorsLayer;
use tower::ServiceBuilder;
use tower_http::trace::TraceLayer;
use crate::config;
use crate::services::item_service::ItemService;

pub mod common;
mod api;
mod pages;
mod mcp;

pub use common::{AppState, logging_middleware, create_auth_middleware};

pub fn mode_server(
    cmd: &mut Command,
    settings: &config::Settings,
    conn: &mut rusqlite::Connection,
    data_path: PathBuf,
) -> Result<()> {
    // Get server address from args or config with default
    let server_address = if let Some(addr) = &settings.server_address() {
        addr.clone()
    } else if let Some(server_config) = &settings.server {
        server_config.address.clone().unwrap_or_else(|| "127.0.0.1".to_string())
    } else {
        "127.0.0.1".to_string()
    };
    
    // Get server port from args or config with default
    let server_port = if let Some(port) = settings.server_port() {
        port
    } else if let Some(server_config) = &settings.server {
        server_config.port.unwrap_or(21080)
    } else {
        21080
    };
    
    let server_config = common::ServerConfig {
        address: server_address,
        port: Some(server_port),
        password: settings.server_password(),
        password_hash: settings.server_password_hash(),
    };
    
    // Create ItemService once
    let item_service = ItemService::new(data_path.clone());
    
    // We need to move the connection into the async runtime
    let rt = tokio::runtime::Runtime::new()?;
    // Take ownership of the connection and move it into the async runtime
    let owned_conn = std::mem::replace(conn, rusqlite::Connection::open_in_memory()?);
    let cmd = cmd.clone();
    let settings = settings.clone();
    rt.block_on(run_server(server_config, owned_conn, data_path, item_service, cmd, settings))
}

async fn run_server(
    config: common::ServerConfig,
    conn: rusqlite::Connection,
    data_dir: PathBuf,
    item_service: ItemService,
    _cmd: Command,
    settings: config::Settings,
) -> Result<()> {
    // Construct address with port
    let bind_address = if let Some(port) = config.port {
        format!("{}:{}", config.address, port)
    } else {
        format!("{}:21080", config.address)
    };
    
    debug!("SERVER: Starting REST HTTP server on {}", bind_address);
    
    // Use the existing database connection
    let db_conn = Arc::new(Mutex::new(conn));
    
    let state = AppState {
        db: db_conn,
        data_dir: data_dir.clone(),
        item_service: Arc::new(item_service),
        cmd: Arc::new(Mutex::new(Command::new("keep"))),
        settings: Arc::new(settings.clone()),
    };
    
    // Create MCP router
    let mcp_router = Router::new()
        .route("/mcp", post(mcp::handle_mcp_request))
        .with_state(state.clone());
    
    // Create the app with documentation routes open and others protected
    let app = Router::new()
        // Add documentation routes without authentication
        .merge(api::add_docs_routes(Router::new()))
        // Add API, pages, and MCP routes with authentication
        .merge(
            Router::new()
                .merge(api::add_routes(Router::new()))
                .merge(pages::add_routes(Router::new()))
                .merge(mcp_router)
                .layer(axum::middleware::from_fn(create_auth_middleware(config.password.clone(), config.password_hash.clone())))
        )
        // Apply state to all routes
        .with_state(state)
        // Add other middleware layers to all routes
        .layer(axum::middleware::from_fn(logging_middleware))
        .layer(
            ServiceBuilder::new()
                .layer(TraceLayer::new_for_http())
                .layer(CorsLayer::permissive())
        );
    
    let addr: SocketAddr = bind_address.parse()?;
    
    info!("SERVER: HTTP server listening on {}", addr);
    
    let listener = tokio::net::TcpListener::bind(addr).await?;
    axum::serve(
        listener, 
        app.into_make_service_with_connect_info::<SocketAddr>()
    ).await?;
    
    Ok(())
}