"""CLI entry point for the batch agent evaluation harness.

Usage::

    # From services/batch-agent/:
    python -m eval run                                # all agent fixtures, default model
    python -m eval run --fixture=classify-invoices    # single fixture
    python -m eval run --models=gpt-4o,gpt-5.3-codex  # multiple models
    python -m eval run --mode=step1                   # only step1 fixtures
    python -m eval run --no-judge                     # skip LLM judge scoring

    python -m eval interactive                        # interactive journey session
    python -m eval interactive --fixture=journey-invoice-setup
    python -m eval interactive --model=gpt-4o
    python -m eval interactive --judge-model=github_copilot/gpt-4o-mini

    python -m eval list                               # list all fixtures
    python -m eval sync                               # sync fixtures to Langfuse datasets
"""

from __future__ import annotations

import argparse
import asyncio
import logging
import sys
from pathlib import Path

# Ensure the service root and repo root are in sys.path.
# Service root must come BEFORE repo root so its ``app/`` package
# shadows the monolith ``app/`` in the repo root.
_SERVICE_ROOT = Path(__file__).resolve().parent.parent
_REPO_ROOT = _SERVICE_ROOT.parent.parent
_sr = str(_SERVICE_ROOT)
_rr = str(_REPO_ROOT)
if _rr not in sys.path:
    sys.path.insert(0, _rr)
# Always force service root to position 0 (python -m may have already
# added CWD further down the list, which loses to repo root).
if _sr in sys.path:
    sys.path.remove(_sr)
sys.path.insert(0, _sr)

from eval.config import discover_fixtures, discover_journey_fixtures
from eval.runner import run_fixture_eval, print_results
from eval.interactive import run_interactive
from eval import langfuse_eval


def _setup_logging(verbose: bool) -> None:
    level = logging.DEBUG if verbose else logging.INFO
    logging.basicConfig(
        level=level,
        format="%(asctime)s %(name)-20s %(levelname)-5s %(message)s",
        datefmt="%H:%M:%S",
    )
    # Quiet noisy libraries
    for name in ("httpx", "httpcore", "openai", "litellm", "urllib3"):
        logging.getLogger(name).setLevel(logging.WARNING)


def _parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(
        description="Batch Agent E2E evaluation harness",
        prog="python -m eval",
    )
    sub = parser.add_subparsers(dest="command", required=True)

    # ── run ───────────────────────────────────────────────────────
    run_cmd = sub.add_parser("run", help="Run evaluations")
    run_cmd.add_argument(
        "--fixture", "-f",
        help="Run only the named fixture (default: all)",
    )
    run_cmd.add_argument(
        "--models", "-m",
        default="github_copilot/gpt-5.3-codex",
        help="Comma-separated list of models to test (default: github_copilot/gpt-5.3-codex)",
    )
    run_cmd.add_argument(
        "--mode",
        default=None,
        choices=["step1", "step2", "full"],
        help="Only run fixtures with this mode (default: all)",
    )
    run_cmd.add_argument(
        "--no-judge",
        action="store_true",
        help="Skip LLM-as-judge scoring",
    )
    run_cmd.add_argument(
        "--judge-model",
        default="gpt-4o",
        help="Model for LLM judge (default: gpt-4o)",
    )
    run_cmd.add_argument(
        "--fixtures-dir",
        default=None,
        help="Path to fixtures directory (default: eval/fixtures/)",
    )
    run_cmd.add_argument("-v", "--verbose", action="store_true")

    # ── list ──────────────────────────────────────────────────────
    list_cmd = sub.add_parser("list", help="List available fixtures")
    list_cmd.add_argument("--fixtures-dir", default=None)
    list_cmd.add_argument("-v", "--verbose", action="store_true")

    # ── sync ──────────────────────────────────────────────────────
    sync_cmd = sub.add_parser("sync", help="Sync fixtures to Langfuse datasets")
    sync_cmd.add_argument("--fixture", "-f", default=None, help="Sync only the named fixture")
    sync_cmd.add_argument("--fixtures-dir", default=None)
    sync_cmd.add_argument("-v", "--verbose", action="store_true")

    # ── interactive ───────────────────────────────────────────────
    inter_cmd = sub.add_parser("interactive", help="Interactive journey session (human-in-the-loop)")
    inter_cmd.add_argument(
        "--fixture", "-f",
        help="Journey fixture to use (default: pick interactively)",
    )
    inter_cmd.add_argument(
        "--model", "-m",
        default="github_copilot/gpt-5.3-codex",
        help="Model for the journey AI (default: github_copilot/gpt-5.3-codex)",
    )
    inter_cmd.add_argument(
        "--judge-model",
        default="gpt-4o",
        help="Model for LLM judge (default: gpt-4o)",
    )
    inter_cmd.add_argument(
        "--fixtures-dir",
        default=None,
        help="Path to fixtures directory (default: eval/fixtures/)",
    )
    inter_cmd.add_argument(
        "--data-dir",
        default=None,
        help="Override sample data directory (e.g. path to private test files not in git)",
    )
    inter_cmd.add_argument("-v", "--verbose", action="store_true")

    return parser.parse_args()


def _fixtures_dir(arg: str | None) -> Path | None:
    if arg:
        return Path(arg)
    return None


async def _cmd_run(args: argparse.Namespace) -> None:
    fixtures = discover_fixtures(_fixtures_dir(args.fixtures_dir))
    if not fixtures:
        print("No fixtures found. Create YAML files in eval/fixtures/.")
        return

    if args.fixture:
        fixtures = [f for f in fixtures if f.name == args.fixture]
        if not fixtures:
            print(f"Fixture '{args.fixture}' not found.")
            return

    models = [m.strip() for m in args.models.split(",")]

    all_results = []
    for fixture in fixtures:
        if args.mode and fixture.mode != args.mode:
            continue
        results = await run_fixture_eval(
            fixture,
            models=models,
            use_llm_judge=not args.no_judge,
            judge_model=args.judge_model,
        )
        all_results.extend(results)

    print_results(all_results)


def _cmd_list(args: argparse.Namespace) -> None:
    fixtures = discover_fixtures(_fixtures_dir(args.fixtures_dir))
    journey_fixtures = discover_journey_fixtures(_fixtures_dir(args.fixtures_dir))

    if not fixtures and not journey_fixtures:
        print("No fixtures found.")
        return

    if fixtures:
        print(f"\n{'[Agent Fixtures]'}")
        print(f"{'Name':<30} {'Mode':<6} {'Types':<25} {'Expected'}")
        print("-" * 90)
        for f in fixtures:
            types = ", ".join(f.data_types)
            n_expected = len(f.expected) + len(f.expected_classification)
            print(f"{f.name:<30} {f.mode:<6} {types:<25} {n_expected}")

    if journey_fixtures:
        print(f"\n{'[Journey Fixtures]'}")
        print(f"{'Name':<30} {'Types':<25} {'Messages':<10} {'Criteria'}")
        print("-" * 90)
        for f in journey_fixtures:
            types = ", ".join(f.data_types)
            print(f"{f.name:<30} {types:<25} {len(f.user_messages):<10} {len(f.expected_template_criteria)}")

    print()


def _cmd_sync(args: argparse.Namespace) -> None:
    fixtures = discover_fixtures(_fixtures_dir(args.fixtures_dir))
    journey_fixtures = discover_journey_fixtures(_fixtures_dir(args.fixtures_dir))

    if args.fixture:
        fixtures = [f for f in fixtures if f.name == args.fixture]
        journey_fixtures = [f for f in journey_fixtures if f.name == args.fixture]

    if not fixtures and not journey_fixtures:
        print("No fixtures to sync.")
        return

    for fixture in fixtures:
        name = langfuse_eval.sync_fixture_to_dataset(fixture)
        if name:
            print(f"Synced: {fixture.name} → {name}")
        else:
            print(f"Skipped: {fixture.name} (Langfuse not configured)")

    for fixture in journey_fixtures:
        name = langfuse_eval.sync_journey_fixture_to_dataset(fixture)
        if name:
            print(f"Synced: {fixture.name} → {name}")
        else:
            print(f"Skipped: {fixture.name} (Langfuse not configured)")


async def _cmd_interactive(args: argparse.Namespace) -> None:
    journey_fixtures = discover_journey_fixtures(_fixtures_dir(args.fixtures_dir))
    if not journey_fixtures:
        print("No journey fixtures found. Create YAML files with type: journey in eval/fixtures/.")
        return

    if args.fixture:
        fixtures = [f for f in journey_fixtures if f.name == args.fixture]
        if not fixtures:
            print(f"Journey fixture '{args.fixture}' not found.")
            return
        fixture = fixtures[0]
    elif len(journey_fixtures) == 1:
        fixture = journey_fixtures[0]
    else:
        # Let user pick
        print("\nAvailable journey fixtures:")
        for i, f in enumerate(journey_fixtures, 1):
            print(f"  {i}. {f.name} — {f.description[:60]}")
        print()
        try:
            choice = int(input("Pick a fixture number: ").strip()) - 1
            fixture = journey_fixtures[choice]
        except (ValueError, IndexError, EOFError, KeyboardInterrupt):
            print("Invalid choice.")
            return

    await run_interactive(
        fixture,
        model=args.model,
        judge_model=args.judge_model,
        data_dir=Path(args.data_dir).resolve() if args.data_dir else None,
    )


def main() -> None:
    args = _parse_args()
    _setup_logging(args.verbose)

    if args.command == "run":
        asyncio.run(_cmd_run(args))
    elif args.command == "interactive":
        asyncio.run(_cmd_interactive(args))
    elif args.command == "list":
        _cmd_list(args)
    elif args.command == "sync":
        _cmd_sync(args)


if __name__ == "__main__":
    main()