"""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=freelance-invoices   # single fixture
    python -m eval run --models=gpt-4o,anthropic/claude-sonnet-4
    python -m eval run --variants=baseline,detailed   # specific prompt variants
    python -m eval run --no-judge                     # skip LLM judge scoring

    python -m eval journey                            # all journey fixtures
    python -m eval journey --fixture=journey-invoices # single journey fixture
    python -m eval journey --models=gpt-4o,anthropic/claude-sonnet-4

    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 = Path(__file__).resolve().parent.parent
_REPO_ROOT = _SERVICE_ROOT.parent.parent
for p in (_SERVICE_ROOT, _REPO_ROOT):
    if str(p) not in sys.path:
        sys.path.insert(0, str(p))

from eval.config import discover_fixtures, discover_journey_fixtures
from eval.runner import run_fixture_eval, print_results
from eval.journey_runner import run_journey_fixture_eval, print_journey_results
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="gpt-4o",
        help="Comma-separated list of models to test (default: gpt-4o)",
    )
    run_cmd.add_argument(
        "--variants", "-p",
        default=None,
        help="Comma-separated prompt variants to test (default: all in fixture)",
    )
    run_cmd.add_argument(
        "--no-judge",
        action="store_true",
        help="Skip LLM-as-judge scoring",
    )
    run_cmd.add_argument(
        "--judge-model",
        default="gpt-4o-mini",
        help="Model for LLM judge (default: gpt-4o-mini)",
    )
    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")

    # ── journey ───────────────────────────────────────────────────
    journey_cmd = sub.add_parser("journey", help="Run journey evaluations")
    journey_cmd.add_argument(
        "--fixture", "-f",
        help="Run only the named journey fixture (default: all)",
    )
    journey_cmd.add_argument(
        "--models", "-m",
        default="gpt-4o",
        help="Comma-separated list of models to test (default: gpt-4o)",
    )
    journey_cmd.add_argument(
        "--judge-model",
        default="gpt-4o-mini",
        help="Model for LLM judge (default: gpt-4o-mini)",
    )
    journey_cmd.add_argument(
        "--fixtures-dir",
        default=None,
        help="Path to fixtures directory (default: eval/fixtures/)",
    )
    journey_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")

    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(",")]
    variants = [v.strip() for v in args.variants.split(",")] if args.variants else None

    all_results = []
    for fixture in fixtures:
        results = await run_fixture_eval(
            fixture,
            models=models,
            variants=variants,
            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} {'Types':<25} {'Variants':<20} {'Expected'}")
        print("-" * 90)
        for f in fixtures:
            variants = ", ".join(f.prompt_variants.keys())
            types = ", ".join(f.data_types)
            print(f"{f.name:<30} {types:<25} {variants:<20} {len(f.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_journey(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:
        journey_fixtures = [f for f in journey_fixtures if f.name == args.fixture]
        if not journey_fixtures:
            print(f"Journey fixture '{args.fixture}' not found.")
            return

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

    all_results = []
    for fixture in journey_fixtures:
        results = await run_journey_fixture_eval(
            fixture,
            models=models,
            judge_model=args.judge_model,
        )
        all_results.extend(results)

    print_journey_results(all_results)


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

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


if __name__ == "__main__":
    main()