"""Custodian Agent Runtime — single OODA cycle entry point.

Usage:
    uv run python agent.py --domain custodian
    uv run python agent.py --all
    uv run python agent.py --domain custodian --dry-run
    uv run python agent.py --domain custodian --llm gemini

The agent runs one complete Observe → Orient → Decide → Act cycle and exits.
All output is printed to stdout. Errors are non-fatal where possible.

See ADR-002 for architecture decisions.
"""
from __future__ import annotations

import argparse
import datetime
import sys
from pathlib import Path

from actions import execute, parse_plan
from context import API_BASE, build_context, fetch_state, load_constitution

try:
    from llm_connect import RunConfig, create_adapter
    _HAS_LLM_CONNECT = True
except ImportError:
    _HAS_LLM_CONNECT = False


def run(
    domain: str | None,
    dry_run: bool,
    llm_provider: str,
    api_base: str = API_BASE,
) -> int:
    """Execute one OODA cycle. Returns exit code (0 = ok, 1 = error)."""
    scope = f"domain={domain}" if domain else "all domains"
    print(f"[custodian-agent] {datetime.datetime.now().isoformat(timespec='seconds')} scope={scope}")

    # --- Observe ---
    print("[observe] fetching state from state-hub…")
    state = fetch_state(domain=domain, api_base=api_base)
    if not state:
        print("[observe] WARNING: state-hub unreachable or returned empty state. "
              "Proceeding with empty context (graceful degradation).")

    # --- Orient ---
    print("[orient] loading constitution and building context…")
    constitution = load_constitution()
    context = build_context(state, constitution)

    # --- Decide ---
    if not _HAS_LLM_CONNECT:
        print("[decide] ERROR: llm-connect not available. Run `uv sync` first.", file=sys.stderr)
        return 1

    print(f"[decide] calling LLM via provider={llm_provider!r}…")
    try:
        adapter = create_adapter(llm_provider)
        config = RunConfig(temperature=0.3, max_tokens=2000)
        llm_response = adapter.execute_prompt(context, config)
        response_text = llm_response.content
    except Exception as exc:
        print(f"[decide] ERROR: LLM call failed: {exc}", file=sys.stderr)
        return 1

    # Save reasoning trace to working memory
    _save_session_note(response_text, domain)

    # --- Act ---
    plan = parse_plan(response_text)
    mode = "dry-run" if dry_run else "live"
    print(f"[act] executing plan ({mode}): "
          f"{len(plan['progress_events'])} events, "
          f"{len(plan['tasks_to_update'])} task updates, "
          f"{len(plan['tasks_to_flag'])} flags")

    results = execute(plan, api_base=api_base, dry_run=dry_run)
    for r in results:
        print(f"  {r}")

    print(f"[custodian-agent] done — {len(results)} actions.")
    return 0


def _save_session_note(response_text: str, domain: str | None) -> None:
    """Append the LLM reasoning trace to working memory (append-only)."""
    memory_dir = Path(__file__).parent.parent / "memory" / "working"
    if not memory_dir.exists():
        return
    timestamp = datetime.datetime.now().strftime("%Y-%m-%dT%H%M%S")
    scope = domain or "all"
    note_path = memory_dir / f"agent-session-{timestamp}-{scope}.md"
    try:
        note_path.write_text(
            f"---\ntype: agent-session-note\nscope: {scope}\ntimestamp: {timestamp}\n---\n\n"
            + response_text,
            encoding="utf-8",
        )
    except Exception:
        pass  # Non-fatal — memory write failure does not stop the cycle


def main() -> None:
    parser = argparse.ArgumentParser(
        description="Custodian Agent — single OODA cycle (Observe→Orient→Decide→Act)",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  uv run python agent.py --domain custodian
  uv run python agent.py --domain custodian --dry-run
  uv run python agent.py --all --llm gemini
        """,
    )
    scope = parser.add_mutually_exclusive_group(required=True)
    scope.add_argument("--domain", metavar="SLUG",
                       help="Focus on a single domain (e.g. custodian, railiance)")
    scope.add_argument("--all", action="store_true",
                       help="Run over full cross-domain state summary")
    parser.add_argument("--dry-run", action="store_true",
                        help="Print planned actions without executing them")
    parser.add_argument("--llm", default="claude-code", metavar="PROVIDER",
                        help="LLM provider: claude-code (default), gemini, openrouter, openai")
    parser.add_argument("--api-base", default=API_BASE, metavar="URL",
                        help=f"State-hub API base URL (default: {API_BASE})")
    args = parser.parse_args()

    domain = args.domain if not args.all else None
    sys.exit(run(domain, args.dry_run, args.llm, args.api_base))


if __name__ == "__main__":
    main()