mod app;
mod auth;
mod error;
mod rate_limit;
mod request_context;
mod routes;
mod service;
mod state;
mod storage;

use std::{env, net::SocketAddr, path::PathBuf};

use crank_registry::{PostgresPoolConfig, PostgresRegistry};
use sqlx::postgres::PgConnectOptions;
use tokio::net::TcpListener;
use tracing::info;

use crate::{
    app::build_app,
    auth::{AuthSettings, BootstrapAdminConfig},
    service::AdminService,
    state::AppState,
};
use crank_runtime::{
    RequestRateLimitConfig, RequestRateLimiter, RuntimeExecutor, RuntimeLimits, SecretCrypto,
};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    tracing_subscriber::fmt()
        .with_env_filter(
            env::var("CRANK_LOG_LEVEL").unwrap_or_else(|_| "admin_api=info,tower_http=info".into()),
        )
        .init();

    let storage_root = PathBuf::from(
        env::var("CRANK_STORAGE_ROOT").unwrap_or_else(|_| "/var/lib/crank/storage".into()),
    );
    let bind_addr = env::var("CRANK_ADMIN_BIND").unwrap_or_else(|_| "0.0.0.0:3001".into());
    let base_url = env::var("CRANK_BASE_URL").unwrap_or_else(|_| "http://localhost:3000".into());
    let socket_addr: SocketAddr = bind_addr.parse()?;
    let pool_config = PostgresPoolConfig::from_env()?;
    let registry = PostgresRegistry::connect_with_options_and_pool_config(
        database_options_from_env()?,
        pool_config,
    )
    .await?;
    let auth_settings = AuthSettings {
        session_secret: env::var("CRANK_SESSION_SECRET")?,
        password_pepper: env::var("CRANK_PASSWORD_PEPPER")?,
        session_ttl_hours: env::var("CRANK_SESSION_TTL_HOURS")
            .ok()
            .and_then(|value| value.parse::<i64>().ok())
            .unwrap_or(24),
        cookie_secure: base_url.starts_with("https://"),
        bootstrap_admin: BootstrapAdminConfig {
            email: env::var("CRANK_BOOTSTRAP_ADMIN_EMAIL")?,
            password: env::var("CRANK_BOOTSTRAP_ADMIN_PASSWORD")?,
            display_name: env::var("CRANK_BOOTSTRAP_ADMIN_DISPLAY_NAME")
                .unwrap_or_else(|_| "Crank Owner".into()),
        },
    };
    let runtime_limits = RuntimeLimits::from_env()?;
    let api_rate_limit = admin_api_rate_limit_config_from_env()?;
    let secret_crypto = SecretCrypto::new(&env::var("CRANK_MASTER_KEY")?)?;
    let runtime = RuntimeExecutor::with_limits(runtime_limits);
    let service = AdminService::new_with_runtime(
        registry,
        storage_root,
        auth_settings,
        secret_crypto,
        runtime,
    );
    service.bootstrap_admin_user().await?;
    if env_flag("CRANK_DEMO_SEED") {
        service.seed_demo_assets().await?;
    }
    let state = AppState {
        service,
        api_rate_limiter: RequestRateLimiter::new(api_rate_limit),
    };
    let app = build_app(state);
    let listener = TcpListener::bind(socket_addr).await?;

    info!(
        runtime_max_concurrent_unary = runtime_limits.max_concurrent_unary,
        runtime_max_concurrent_window = runtime_limits.max_concurrent_window,
        runtime_max_concurrent_sessions = runtime_limits.max_concurrent_sessions,
        runtime_max_concurrent_jobs = runtime_limits.max_concurrent_jobs,
        admin_rate_limit_rps = api_rate_limit.requests_per_second,
        admin_rate_limit_burst = api_rate_limit.burst,
        max_connections = pool_config.max_connections,
        min_connections = pool_config.min_connections,
        acquire_timeout_ms = pool_config.acquire_timeout_ms,
        idle_timeout_ms = pool_config.idle_timeout_ms,
        max_lifetime_ms = pool_config.max_lifetime_ms,
        "postgres pool configured"
    );
    info!("admin-api listening on {}", socket_addr);

    axum::serve(listener, app).await?;

    Ok(())
}

fn env_flag(name: &str) -> bool {
    matches!(
        env::var(name)
            .ok()
            .as_deref()
            .map(str::to_ascii_lowercase)
            .as_deref(),
        Some("1" | "true" | "yes" | "on")
    )
}

fn admin_api_rate_limit_config_from_env()
-> Result<RequestRateLimitConfig, Box<dyn std::error::Error>> {
    let requests_per_second = env::var("CRANK_ADMIN_RATE_LIMIT_RPS")
        .ok()
        .and_then(|value| value.parse::<u32>().ok())
        .unwrap_or(30);
    let burst = env::var("CRANK_ADMIN_RATE_LIMIT_BURST")
        .ok()
        .and_then(|value| value.parse::<u32>().ok())
        .unwrap_or(60);

    Ok(RequestRateLimitConfig::new(requests_per_second, burst)?)
}

fn database_options_from_env() -> Result<PgConnectOptions, Box<dyn std::error::Error>> {
    if let Ok(database_url) = env::var("CRANK_DATABASE_URL") {
        return Ok(database_url.parse::<PgConnectOptions>()?);
    }

    let host = env::var("POSTGRES_HOST").unwrap_or_else(|_| "postgres".into());
    let port = env::var("POSTGRES_PORT")
        .ok()
        .and_then(|value| value.parse::<u16>().ok())
        .unwrap_or(5432);
    let database = env::var("POSTGRES_DB").unwrap_or_else(|_| "crank".into());
    let username = env::var("POSTGRES_USER").unwrap_or_else(|_| "crank".into());
    let password = env::var("POSTGRES_PASSWORD").unwrap_or_else(|_| "crank".into());

    Ok(PgConnectOptions::new()
        .host(&host)
        .port(port)
        .database(&database)
        .username(&username)
        .password(&password))
}
