mod access;
mod access_service;
mod auth;
mod observability;
mod tools;
mod v1;

use axum::{Router, extract::DefaultBodyLimit, routing::get};
use proto::lakehouse::catalog_service_server::CatalogServiceServer;
use shared::config::Config;
use tower_http::cors::{Any, CorsLayer};
use tower_http::trace::TraceLayer;

#[tokio::main]
async fn main() {
    // Load config
    let config = Config::load_or_default();

    // Initialize tracing + observability
    observability::init_tracing(
        &config.observability.service_name,
        &config.observability.exporter,
    );

    tracing::info!("config loaded: gateway={}:{}, storage={}",
        config.gateway.host, config.gateway.port, config.storage.root);

    // Secrets provider
    let secrets = std::sync::Arc::new(shared::secrets::FileSecretsProvider::from_env());
    if let Err(e) = secrets.load().await {
        tracing::warn!("secrets load: {e} — bucket credentials may be missing");
    }

    // Federation: bucket registry (primary + any [[storage.buckets]] entries + rescue)
    let bucket_registry = std::sync::Arc::new(
        storaged::registry::BucketRegistry::from_config(&config.storage, secrets.clone())
            .await
            .expect("bucket registry init failed")
    );
    let buckets = bucket_registry.list().await;
    tracing::info!(
        "bucket registry: {} buckets [{}], rescue={:?}",
        buckets.len(),
        buckets.iter().map(|b| format!("{}:{}", b.name, b.backend)).collect::<Vec<_>>().join(", "),
        bucket_registry.rescue_name(),
    );

    // Back-compat: existing components that expect a single Arc<ObjectStore>
    // get the primary bucket's store. As we migrate call sites to be bucket-
    // aware, they'll call bucket_registry.get(name) directly.
    let store = bucket_registry.default_store();

    // Catalog
    let registry = catalogd::registry::Registry::new(store.clone());
    if let Err(e) = registry.rebuild().await {
        tracing::warn!("catalog rebuild failed (empty store?): {e}");
    }

    // Query engine with 16GB memory cache
    let cache = queryd::cache::MemCache::new(16 * 1024 * 1024 * 1024);
    let engine = queryd::context::QueryEngine::new(registry.clone(), bucket_registry.clone(), cache);

    // Event journal — append-only mutation log (flush every 100 events)
    let journal = journald::journal::Journal::new(store.clone(), 100);

    // Access control
    let access = access::AccessControl::new(config.auth.enabled);
    access.register_defaults().await;

    // Workspace manager for agent-specific overlays
    let workspace_mgr = queryd::workspace::WorkspaceManager::new(store.clone());
    if let Err(e) = workspace_mgr.rebuild().await {
        tracing::warn!("workspace rebuild: {e}");
    }

    // AI sidecar client
    let ai_client = aibridge::client::AiClient::new(&config.sidecar.url);

    // Vector service components — built before the router because both the
    // /vectors service AND ingestd need the agent handle to enqueue triggers.
    let index_reg = vectord::index_registry::IndexRegistry::new(store.clone());
    let _ = index_reg.rebuild().await;
    let hnsw = vectord::hnsw::HnswStore::new();
    let emb_cache = vectord::embedding_cache::EmbeddingCache::new(store.clone());
    // Phase B (federation layer 2): trial journals + promotion files now
    // live in each index's recorded bucket (IndexMeta.bucket), not always
    // primary. Journal / registry resolve per-call via the bucket registry.
    let tj = vectord::trial::TrialJournal::new(bucket_registry.clone(), index_reg.clone());
    let pr = vectord::promotion::PromotionRegistry::new(bucket_registry.clone(), index_reg.clone());
    let hs = vectord::harness::HarnessStore::new(bucket_registry.clone(), index_reg.clone());
    // Phase 19: playbook memory. Load cached state; empty-on-miss is fine,
    // operators call POST /vectors/playbook_memory/rebuild to populate.
    let pbm = vectord::playbook_memory::PlaybookMemory::new(store.clone());
    let _ = pbm.load_from_storage().await;

    // Phase 16.2: spawn the autotune agent. When config.agent.enabled=false
    // this returns a handle that drops triggers silently — no surprise load.
    let agent_cfg = vectord::agent::AgentConfig {
        enabled: config.agent.enabled,
        cycle_interval_secs: config.agent.cycle_interval_secs,
        cooldown_between_trials_secs: config.agent.cooldown_between_trials_secs,
        min_recall: config.agent.min_recall,
        max_trials_per_hour: config.agent.max_trials_per_hour,
    };
    let agent_handle = vectord::agent::spawn(
        agent_cfg,
        vectord::agent::AgentDeps {
            store: store.clone(),
            ai_client: ai_client.clone(),
            catalog: registry.clone(),
            index_registry: index_reg.clone(),
            hnsw_store: hnsw.clone(),
            embedding_cache: emb_cache.clone(),
            trial_journal: tj.clone(),
            promotion_registry: pr.clone(),
            harness_store: hs.clone(),
        },
    );

    // HTTP router
    let mut app = Router::new()
        .route("/health", get(health))
        .nest("/storage", storaged::service::router(store.clone())
            .merge(storaged::federation_service::router(bucket_registry.clone())))
        .nest("/catalog", catalogd::service::router(registry.clone()))
        .nest("/query", queryd::service::router(engine.clone()))
        .nest("/ai", aibridge::service::router(ai_client.clone()))
        ;

    // Phase E: scheduled ingest
    let sched_store = ingestd::schedule::ScheduleStore::new(store.clone());
    if let Ok(n) = sched_store.rebuild().await {
        if n > 0 { tracing::info!("rebuilt {n} persisted schedule(s)"); }
    }
    let scheduler = ingestd::schedule::Scheduler {
        store: sched_store.clone(),
        ingest: ingestd::schedule::SchedulerIngestDeps {
            store: store.clone(),
            registry: registry.clone(),
            buckets: bucket_registry.clone(),
            agent_handle: Some(agent_handle.clone()),
            index_registry: index_reg.clone(),
        },
        tick_secs: 10,
    };
    scheduler.spawn();

    app = app
        .nest("/ingest", ingestd::service::router(ingestd::service::IngestState {
            store: store.clone(),
            registry: registry.clone(),
            buckets: bucket_registry.clone(),
            agent_handle: agent_handle.clone(),
            index_registry: index_reg.clone(),
            schedules: sched_store,
        }))
        .nest("/vectors", vectord::service::router(vectord::service::VectorState {
            store: store.clone(),
            ai_client: ai_client.clone(),
            job_tracker: vectord::jobs::JobTracker::new(),
            index_registry: index_reg.clone(),
            hnsw_store: hnsw,
            embedding_cache: emb_cache,
            trial_journal: tj,
            harness_store: hs,
            catalog: registry.clone(),
            promotion_registry: pr,
            agent_handle,
            bucket_registry: bucket_registry.clone(),
            active_profile: std::sync::Arc::new(tokio::sync::RwLock::new(None)),
            lance: vectord::lance_backend::LanceRegistry::new(
                bucket_registry.clone(), index_reg.clone(),
            ),
            playbook_memory: pbm,
            embed_semaphore: std::sync::Arc::new(tokio::sync::Semaphore::new(1)),
        }))
        .nest("/workspaces", queryd::workspace_service::router(workspace_mgr))
        .nest("/journal", journald::service::router(journal))
        .nest("/access", access_service::router(access))
        .nest("/tools", tools::service::router({
            let tool_reg = tools::registry::ToolRegistry::new_with_defaults();
            tool_reg.register_defaults().await;
            tools::ToolState {
                registry: tool_reg,
                query_fn: tools::QueryExecutor::new(engine.clone()),
            }
        }))
        // Phase 38 — Universal API skeleton. Thin OpenAI-compatible
        // surface over the existing aibridge → Ollama path. Future
        // phases add provider adapters (39), routing engine (40),
        // session state (41), etc. All without changing this mount.
        .nest("/v1", v1::router(v1::V1State {
            ai_client: ai_client.clone(),
            usage: std::sync::Arc::new(tokio::sync::RwLock::new(v1::Usage::default())),
            // Phase 39 first slice — Ollama Cloud adapter. Key resolved
            // from OLLAMA_CLOUD_KEY env, then /root/llm_team_config.json,
            // then OLLAMA_CLOUD_API_KEY env. None = cloud routes 503.
            ollama_cloud_key: {
                let k = v1::ollama_cloud::resolve_cloud_key();
                if k.is_some() {
                    tracing::info!("v1: Ollama Cloud key loaded — /v1/chat provider=ollama_cloud enabled");
                } else {
                    tracing::warn!("v1: no Ollama Cloud key in env or /root/llm_team_config.json — cloud routes will 503");
                }
                k
            },
            // Phase 40 early deliverable — Langfuse trace emitter.
            // Defaults match mcp-server/tracing.ts conventions so
            // gateway traces land in the same staffing project.
            langfuse: {
                let c = v1::langfuse_trace::LangfuseClient::from_env_or_defaults();
                if c.is_some() {
                    tracing::info!("v1: Langfuse tracing enabled — /v1/chat calls will appear at localhost:3001");
                } else {
                    tracing::warn!("v1: Langfuse keys missing — /v1/chat calls will not be traced");
                }
                c
            },
        }));

    // Auth middleware (if enabled)
    if config.auth.enabled {
        if let Some(ref key) = config.auth.api_key {
            tracing::info!("API key auth enabled");
            let api_key = auth::ApiKey(key.clone());
            app = app.layer(axum::Extension(api_key));
            // Note: auth middleware applied per-route in production
            // For now, the ApiKey extension is available for handlers to check
        } else {
            tracing::warn!("auth enabled but no api_key set — all requests allowed");
        }
    }

    app = app
        .layer(DefaultBodyLimit::max(512 * 1024 * 1024)) // 512MB — supports 500K worker CSV
        .layer(CorsLayer::new()
            .allow_origin(Any)
            .allow_methods(Any)
            .allow_headers(Any))
        .layer(TraceLayer::new_for_http());

    // File watcher — auto-ingest from ./inbox
    let _watcher = ingestd::watcher::spawn_watcher(
        ingestd::watcher::WatchConfig::default(),
        store.clone(),
        registry.clone(),
    );

    // Start gRPC server on port+1
    let grpc_port = config.gateway.port + 1;
    let catalog_grpc = catalogd::grpc::CatalogGrpc::new(registry);
    let grpc_addr = format!("{}:{}", config.gateway.host, grpc_port).parse().unwrap();

    tokio::spawn(async move {
        tracing::info!("gRPC server listening on {grpc_addr}");
        tonic::transport::Server::builder()
            .add_service(CatalogServiceServer::new(catalog_grpc))
            .serve(grpc_addr)
            .await
            .expect("gRPC server failed");
    });

    // Start HTTP server
    let http_addr = format!("{}:{}", config.gateway.host, config.gateway.port);
    tracing::info!("HTTP gateway listening on {http_addr}");

    let listener = tokio::net::TcpListener::bind(&http_addr).await.unwrap();
    axum::serve(listener, app).await.unwrap();
}

async fn health() -> &'static str {
    "lakehouse ok"
}