import argparse
import json
import sys
from pathlib import Path

PROJECT_ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(PROJECT_ROOT))

from tests.fixtures.parser_acceptance import PARSER_ACCEPTANCE_FIXTURES
from training_coach.parser import PARSER_MODEL
from training_coach.parser_ollama import OLLAMA_MODEL, generate_parser_response_ollama
from training_coach.parser_runtime import generate_parser_response
from training_coach.parser import parse_model_response


SEMANTIC_TEXT_FIELDS = {"notes", "follow_up_question", "evidence"}
SEMANTIC_TEXT_LIST_FIELDS = {"follow_up_questions"}


def _tokenize_text(value):
    return {
        token.strip(".,?!;:()[]{}'\"").lower()
        for token in value.split()
        if token.strip(".,?!;:()[]{}'\"")
    }


def _compare_text_semantics(expected, actual, path):
    if not isinstance(actual, str):
        return [f"{path}: expected text, got {type(actual).__name__}"]
    expected_tokens = _tokenize_text(expected)
    actual_tokens = _tokenize_text(actual)
    if expected_tokens and expected_tokens.isdisjoint(actual_tokens):
        return [f"{path}: expected related text {expected!r}, got {actual!r}"]
    return []


def _compare_subset(expected, actual, path=""):
    failures = []

    if isinstance(expected, dict):
        if not isinstance(actual, dict):
            return [f"{path or '<root>'}: expected object, got {type(actual).__name__}"]
        for key, expected_value in expected.items():
            if key not in actual:
                failures.append(f"{path}.{key}: missing key")
                continue
            failures.extend(
                _compare_subset(expected_value, actual[key], f"{path}.{key}".strip("."))
            )
        return failures

    if isinstance(expected, list):
        if not isinstance(actual, list):
            return [f"{path}: expected list, got {type(actual).__name__}"]
        if len(actual) < len(expected):
            failures.append(f"{path}: expected at least {len(expected)} items, got {len(actual)}")
            return failures
        field_name = path.split(".")[-1]
        if field_name in SEMANTIC_TEXT_LIST_FIELDS:
            for expected_item in expected:
                if not any(
                    not _compare_text_semantics(expected_item, actual_item, path)
                    for actual_item in actual
                ):
                    failures.append(f"{path}: expected related text {expected_item!r}")
            return failures
        for index, expected_item in enumerate(expected):
            failures.extend(_compare_subset(expected_item, actual[index], f"{path}[{index}]"))
        return failures

    field_name = path.split(".")[-1]
    if isinstance(expected, str) and field_name in SEMANTIC_TEXT_FIELDS:
        return _compare_text_semantics(expected, actual, path)

    if expected != actual:
        return [f"{path}: expected {expected!r}, got {actual!r}"]

    return []


def evaluate_fixture(fixture, model_name, backend):
    if backend == "ollama":
        response_text = generate_parser_response_ollama(
            fixture["raw_text"],
            model_name=model_name,
        )
    else:
        response_text = generate_parser_response(fixture["raw_text"], model_name=model_name)
    try:
        parsed = parse_model_response(response_text)
    except ValueError as error:
        return response_text, None, [str(error)]
    actual = parsed.model_dump(mode="json")
    failures = _compare_subset(fixture["expected"], actual)
    return response_text, actual, failures


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--backend", choices=["ollama", "transformers"], default="ollama")
    parser.add_argument("--model", default=None)
    args = parser.parse_args()
    model_name = args.model or (OLLAMA_MODEL if args.backend == "ollama" else PARSER_MODEL)

    failed = 0
    print(f"Evaluating parser model: {model_name}")
    print(f"Backend: {args.backend}")

    for fixture in PARSER_ACCEPTANCE_FIXTURES:
        print(f"\n=== {fixture['name']} ===")
        response_text, actual, failures = evaluate_fixture(
            fixture,
            model_name,
            args.backend,
        )

        if failures:
            failed += 1
            print("FAIL")
            for failure in failures:
                print(f"- {failure}")
            print("Model response:")
            print(response_text)
            if actual is not None:
                print("Validated JSON:")
                print(json.dumps(actual, indent=2))
        else:
            print("PASS")

    total = len(PARSER_ACCEPTANCE_FIXTURES)
    passed = total - failed
    print(f"\nParser acceptance: {passed}/{total} passed")
    raise SystemExit(1 if failed else 0)


if __name__ == "__main__":
    main()