from fastapi import FastAPI
from contextlib import asynccontextmanager
import logging
from .db import init_db
from .webhooks.plane import router as plane_router
from .webhooks.gitea import router as gitea_router

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
)


@asynccontextmanager
async def lifespan(app: FastAPI):
    init_db()
    # M-1: proper orphan-recovery.
    # An orphan = an agent_run with no finished_at that is older than the recovery
    # window. After a uvicorn restart the monitor thread is gone, so its child claude
    # process (if any) was reparented to init; we cannot kill it by pid (pid is not
    # persisted). Instead of silently writing exit=-1, we: enumerate each orphan,
    # mark it exit=-1, log a warning per run, and notify so a human can check/restart.
    log = logging.getLogger('orchestrator')
    from .db import get_db
    conn = get_db()
    orphan_rows = conn.execute(
        "SELECT id, task_id, agent FROM agent_runs "
        "WHERE finished_at IS NULL AND started_at < datetime('now', '-35 minutes')"
    ).fetchall()
    for row in orphan_rows:
        run_id, task_id, agent = row[0], row[1], row[2]
        conn.execute(
            "UPDATE agent_runs SET finished_at=datetime('now'), exit_code=-1 WHERE id=?",
            (run_id,),
        )
        log.warning(
            f"Orphan run {run_id} (task {task_id}, agent {agent}) recovered — "
            f"manual check needed (process may have been killed on restart)"
        )
    conn.commit()
    conn.close()
    if orphan_rows:
        try:
            from .notifications import send_telegram
            ids = ", ".join(str(r[0]) for r in orphan_rows)
            send_telegram(
                f"\u26a0\ufe0f Orchestrator restart: {len(orphan_rows)} orphaned agent run(s) "
                f"(run_id: {ids}) marked exit=-1. Нужна ручная проверка/перезапуск."
            )
        except Exception:
            pass
        log.warning(f"Recovered {len(orphan_rows)} orphaned agent runs")

    # ORCH-1 (F-2b): queue-recovery. Any job left in 'running' status belongs to a
    # worker that died on the previous restart -> put it back to 'queued' so the
    # worker re-picks it up (restart-safe, no lost work). Runs AFTER M-1.
    from .db import requeue_running_jobs
    requeued = requeue_running_jobs()
    if requeued:
        log.warning(f"Queue-recovery: requeued {requeued} running job(s) after restart")

    # ORCH-065: proactive startup reclaim of dead/stale merge-leases, next to the
    # queue-recovery above. A lease held by the previous (now dead) process pid is
    # released at once instead of waiting for the TTL / a foreign acquire so the
    # next merge is not blocked. Conditional (merge_gate_repos / self-hosting) and
    # gated by ORCH_LEASE_RECLAIM_ENABLED; never raises.
    try:
        from .job_reaper import reclaim_all_stale_leases
        reclaimed = reclaim_all_stale_leases()
        if reclaimed:
            log.warning(f"Startup lease-reclaim: reclaimed {reclaimed} stale merge-lease(s)")
    except Exception as e:
        log.warning(f"Startup lease-reclaim skipped: {e}")

    # L-2: rotate old per-run logs at startup (best-effort; never fatal).
    try:
        import os as _os
        from .config import settings as _settings
        from .agents.launcher import prune_run_logs
        _runs_dir = _os.path.join(_os.path.dirname(_settings.db_path), "runs")
        _removed = prune_run_logs(
            _runs_dir,
            keep_days=_settings.log_keep_days,
            keep_max=_settings.log_keep_max,
        )
        if _removed:
            log.info(f"Log rotation: pruned {_removed} old run log(s) from {_runs_dir}")
    except Exception as e:
        log.warning(f"Log rotation skipped: {e}")

    # Start the background job-queue worker (ORCH-1).
    from .queue_worker import worker
    worker.start()

    # ORCH-053: start the stuck-task reconciler AFTER the worker so its active-job
    # guard sees a fully-initialised queue. Kill-switch: ORCH_RECONCILE_ENABLED.
    from .reconciler import reconciler
    reconciler.start()

    # ORCH-065: start the job-reaper LAST (after requeue_running_jobs + the worker
    # + the reconciler) so its atomic status='running' guard never races the
    # startup requeue. It reaps zombie jobs and periodically reclaims stale
    # merge-leases. Kill-switch: ORCH_REAPER_ENABLED.
    from .job_reaper import reaper
    reaper.start()

    # ORCH-063: start the disk-watchdog LAST (after the reaper). It is independent
    # of the queue/DB — it only reads host-FS fill and Telegram-alerts at >=
    # threshold — so the order is not critical, but we follow the daemon
    # convention. Honours the kill-switch ORCH_DISK_MONITOR_ENABLED (start() is a
    # no-op when disabled, so behaviour is 1:1 as before).
    from .disk_watchdog import disk_watchdog
    disk_watchdog.start()

    try:
        yield
    finally:
        # ORCH-063: stop the disk-watchdog first (reverse of startup).
        disk_watchdog.stop()
        # Graceful shutdown order mirrors startup in reverse: stop the reaper
        # first, then the reconciler (it must not enqueue new work while the
        # worker is winding down), then the worker. Running agents keep going;
        # their jobs are requeued on next start via queue-recovery if the
        # process dies.
        reaper.stop()
        reconciler.stop()
        worker.stop()


app = FastAPI(title="Multi-Agent Orchestrator", lifespan=lifespan)
app.include_router(plane_router, prefix="/webhook")
app.include_router(gitea_router, prefix="/webhook")


@app.get("/health")
async def health():
    return {"status": "ok", "service": "orchestrator"}


@app.get("/status")
async def status():
    from .db import get_db
    conn = get_db()
    tasks = conn.execute(
        "SELECT * FROM tasks WHERE stage != 'done' ORDER BY created_at DESC LIMIT 10"
    ).fetchall()
    conn.close()
    return {"active_tasks": [dict(t) for t in tasks]}


@app.get("/queue")
async def queue():
    """ORCH-1: job-queue observability — status counts + recent jobs."""
    from .db import job_status_counts, recent_jobs
    from .queue_worker import worker
    from .reconciler import reconciler
    from .job_reaper import reaper
    from . import post_deploy
    from . import merge_gate
    from . import task_deps
    from . import serial_gate
    from . import labels
    from .disk_watchdog import disk_watchdog
    return {
        "counts": job_status_counts(),
        "max_concurrency": worker.max_concurrency,
        "poll_interval": worker.poll_interval,
        "resilience": worker.status(),
        "reconcile": reconciler.status(),
        "reaper": reaper.status(),
        "post_deploy": post_deploy.status(),
        "merge_verify": merge_gate.merge_verify_status(),
        # ORCH-026 (G-2): declarative task-dependency observability (read-only,
        # NOT a source of truth) — declared edges, blocked tasks, detected cycle.
        "task_deps": task_deps.snapshot(),
        # ORCH-088 (D9 / AC-10): per-repo serial-gate observability (read-only) —
        # active task, queued/waiting analyst-jobs, freeze state. Additive block.
        "serial_gate": serial_gate.snapshot(),
        # ORCH-089 (D7): auto-mode-by-label observability (read-only) — kill-switch,
        # label names, scope. Additive block.
        "auto_labels": labels.snapshot(),
        # ORCH-063 (FR-6 / AC-7): disk-watchdog observability (read-only) —
        # enabled, threshold, interval, last measurement per host-path. Additive
        # block; never-raise (status() returns {"enabled": ...} minimum on error).
        "disk_monitor": disk_watchdog.status(),
        "recent": recent_jobs(10),
    }


@app.post("/serial-gate/unfreeze")
async def serial_gate_unfreeze(repo: str = ""):
    """ORCH-088 (FR-5, ADR-001 D4): manually clear a per-repo rollback-freeze.

    A freeze set by the post-deploy monitor (DEGRADED) keeps the serial gate CLOSED
    for the repo until an operator explicitly clears it here. Idempotent: clearing
    an already-clear repo reports ``cleared: 0``. The next queued analyst-job is then
    claimable on the next scheduler tick (no restart needed). Alternative manual path
    (documented in README): ``UPDATE repo_freeze SET cleared_at=datetime('now')
    WHERE repo=? AND cleared_at IS NULL``.
    """
    from . import serial_gate
    if not repo or not repo.strip():
        return {"ok": False, "error": "missing 'repo'", "repo": repo, "cleared": 0}
    repo = repo.strip()
    cleared = serial_gate.clear_repo_freeze(repo)
    frozen = serial_gate.is_repo_frozen(repo)
    if cleared:
        try:
            from .notifications import send_telegram
            send_telegram(
                f"🔥 {repo}: пакет РАЗМОРОЖЕН вручную ({cleared} запис(ь/и) снято). "
                f"Следующая задача репо стартует на ближайшем цикле."
            )
        except Exception:
            pass
    return {"ok": True, "repo": repo, "cleared": cleared, "frozen": frozen}