"""Run the cognition eval harness.

Loads cases from cognition_cases.jsonl, runs each through the
CognitiveTurnPipeline, and produces an EvalReport with deterministic
metrics. Each case gets a fresh pipeline instance for isolation.
"""

from __future__ import annotations

import json
from functools import partial
from pathlib import Path
from typing import Callable

from chat.runtime import ChatRuntime
from core.config import RuntimeConfig
from core.cognition.pipeline import CognitiveTurnPipeline
from evals.metrics import CaseResult, EvalReport
from evals._parallel import run_cases_parallel
from generate.intent import IntentTag

_CASES_PATH = Path(__file__).parent / "cognition_cases.jsonl"


def load_cases(path: Path | None = None) -> list[dict]:
    p = path or _CASES_PATH
    cases = []
    for line in p.read_text().splitlines():
        line = line.strip()
        if line:
            cases.append(json.loads(line))
    return cases


def _run_case(case: dict, pipeline: CognitiveTurnPipeline) -> CaseResult:
    prompt = case["prompt"]
    expected_intent = case["expected_intent"]
    expected_terms = case.get("expected_terms", [])
    expected_surface_contains = case.get("expected_surface_contains", [])

    result = pipeline.run(prompt, max_tokens=8)

    actual_intent = result.intent.tag if result.intent else IntentTag.UNKNOWN
    intent_correct = actual_intent.value == expected_intent

    surface_lower = result.surface.lower()
    terms_captured = tuple(
        t for t in expected_terms if t.lower() in surface_lower
    )
    surface_contains_pass = all(
        s.lower() in surface_lower for s in expected_surface_contains
    )

    versor_ok = result.versor_condition < 1e-6

    return CaseResult(
        case_id=case["id"],
        category=case.get("category", "unknown"),
        prompt=prompt,
        intent_correct=intent_correct,
        terms_captured=terms_captured,
        terms_expected=tuple(expected_terms),
        surface_contains_pass=surface_contains_pass,
        versor_closure=versor_ok,
        versor_condition=result.versor_condition,
        trace_hash=result.trace_hash,
        surface=result.surface,
    )


def _build_case_runner(
    config: RuntimeConfig | None = None,
) -> Callable[[dict], CaseResult]:
    """Warm worker-local caches once, then return a per-case scorer."""
    if config is None:
        ChatRuntime(no_load_state=True)
    else:
        ChatRuntime(config=config, no_load_state=True)

    def _run(case: dict) -> CaseResult:
        runtime = ChatRuntime(config=config, no_load_state=True) if config else ChatRuntime(no_load_state=True)
        pipeline = CognitiveTurnPipeline(runtime)
        return _run_case(case, pipeline)

    return _run


def run_eval(
    cases: list[dict] | None = None,
    config: RuntimeConfig | None = None,
    *,
    workers: int | None = None,
) -> EvalReport:
    if cases is None:
        cases = load_cases()

    report = EvalReport()

    case_runner_builder = partial(_build_case_runner, config=config)
    case_results = run_cases_parallel(
        cases,
        case_runner_builder,
        n_workers=workers if workers is not None else 4,
    )

    for case_result in case_results:

        report.total += 1
        if case_result.intent_correct:
            report.intent_correct += 1
        report.terms_expected += len(case_result.terms_expected)
        report.terms_captured += len(case_result.terms_captured)
        if case_result.surface_contains_pass:
            report.surface_grounded += 1
        if case_result.versor_closure:
            report.versor_closures += 1
        report.cases.append(case_result)
        report.trace_hashes[case_result.case_id] = case_result.trace_hash

    return report


def check_determinism(cases: list[dict] | None = None, runs: int = 2) -> bool:
    if cases is None:
        cases = load_cases()

    hashes_by_run: list[dict[str, str]] = []
    for _ in range(runs):
        report = run_eval(cases)
        hashes_by_run.append(dict(report.trace_hashes))

    first = hashes_by_run[0]
    for run_hashes in hashes_by_run[1:]:
        if run_hashes != first:
            return False
    return True