mod api;
mod agent;
mod db;
mod kb;
mod llm;
mod exec;
pub mod state;
mod template;
mod timer;
mod tools;
mod ws;

use std::sync::Arc;
use axum::Router;
use sqlx::sqlite::SqlitePool;
use tower_http::cors::CorsLayer;
use tower_http::services::{ServeDir, ServeFile};

pub struct AppState {
    pub db: db::Database,
    pub config: Config,
    pub agent_mgr: Arc<agent::AgentManager>,
    pub kb: Option<Arc<kb::KbManager>>,
    pub obj_root: String,
}

#[derive(Debug, Clone, serde::Deserialize)]
pub struct Config {
    pub llm: LlmConfig,
    pub server: ServerConfig,
    pub database: DatabaseConfig,
    #[serde(default)]
    pub template_repo: Option<TemplateRepoConfig>,
}

#[derive(Debug, Clone, serde::Deserialize)]
pub struct TemplateRepoConfig {
    pub gitea_url: String,
    pub owner: String,
    pub repo: String,
    #[serde(default = "default_repo_path")]
    pub local_path: String,
}

fn default_repo_path() -> String {
    if std::path::Path::new("/app/oseng-templates").is_dir() {
        "/app/oseng-templates".to_string()
    } else {
        "oseng-templates".to_string()
    }
}

#[derive(Debug, Clone, serde::Deserialize)]
pub struct LlmConfig {
    pub base_url: String,
    pub api_key: String,
    pub model: String,
}

#[derive(Debug, Clone, serde::Deserialize)]
pub struct ServerConfig {
    pub host: String,
    pub port: u16,
}

#[derive(Debug, Clone, serde::Deserialize)]
pub struct DatabaseConfig {
    pub path: String,
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    tracing_subscriber::fmt()
        .with_env_filter("tori=debug,tower_http=debug")
        .init();

    let config_str = std::fs::read_to_string("config.yaml")
        .expect("Failed to read config.yaml");
    let config: Config = serde_yaml::from_str(&config_str)
        .expect("Failed to parse config.yaml");

    let database = db::Database::new(&config.database.path).await?;
    database.migrate().await?;

    // Initialize KB manager
    let kb_arc = match kb::KbManager::new(database.pool.clone()) {
        Ok(kb) => {
            tracing::info!("KB manager initialized");
            Some(Arc::new(kb))
        }
        Err(e) => {
            tracing::warn!("KB manager init failed (will retry on use): {}", e);
            None
        }
    };

    // Ensure template repo is cloned before serving
    if let Some(ref repo_cfg) = config.template_repo {
        template::ensure_repo_ready(repo_cfg).await;
    }

    let agent_mgr = agent::AgentManager::new(
        database.pool.clone(),
        config.llm.clone(),
        config.template_repo.clone(),
        kb_arc.clone(),
    );

    timer::start_timer_runner(database.pool.clone(), agent_mgr.clone());

    // Resume incomplete workflows after restart
    resume_workflows(database.pool.clone(), agent_mgr.clone()).await;

    let obj_root = std::env::var("OBJ_ROOT").unwrap_or_else(|_| "/data/obj".to_string());

    let state = Arc::new(AppState {
        db: database,
        config: config.clone(),
        agent_mgr: agent_mgr.clone(),
        kb: kb_arc,
        obj_root: obj_root.clone(),
    });

    let app = Router::new()
        .nest("/tori/api", api::router(state))
        .nest("/api/obj", api::obj::router(obj_root.clone()))
        .route("/api/obj/", axum::routing::get({
            let r = obj_root;
            move || api::obj::root_listing(r)
        }))
        .nest("/ws/tori", ws::router(agent_mgr))
        .nest_service("/tori", ServeDir::new("web/dist").fallback(ServeFile::new("web/dist/index.html")))
        .route("/", axum::routing::get(|| async {
            axum::response::Redirect::permanent("/tori/")
        }))
        .layer(CorsLayer::permissive());

    let addr = format!("{}:{}", &config.server.host, config.server.port);
    tracing::info!("Tori server listening on {}", addr);
    let listener = tokio::net::TcpListener::bind(&addr).await?;
    axum::serve(listener, app).await?;

    Ok(())
}

async fn resume_workflows(pool: SqlitePool, agent_mgr: Arc<agent::AgentManager>) {
    let rows: Vec<(String, String, String)> = match sqlx::query_as(
        "SELECT w.id, w.project_id, w.requirement FROM workflows w \
         JOIN projects p ON w.project_id = p.id \
         WHERE w.status IN ('pending', 'planning', 'executing') \
         AND p.deleted = 0 \
         ORDER BY w.created_at ASC"
    )
    .fetch_all(&pool)
    .await
    {
        Ok(r) => r,
        Err(e) => {
            tracing::error!("Failed to query incomplete workflows: {}", e);
            return;
        }
    };

    if rows.is_empty() {
        tracing::info!("No incomplete workflows to resume");
        return;
    }

    tracing::info!("Resuming {} incomplete workflow(s)", rows.len());
    for (workflow_id, project_id, requirement) in rows {
        tracing::info!("Resuming workflow {} (project {})", workflow_id, project_id);
        agent_mgr.send_event(&project_id, agent::AgentEvent::NewRequirement {
            workflow_id,
            requirement,
            template_id: None,
        }).await;
    }
}