"""BrainCore Memory Benchmark — main evaluation harness."""

import argparse
import importlib
import json
import time
from pathlib import Path
from typing import Any

from metrics import (
    aggregate,
    exact_match,
    semantic_placeholder_score,
    temporal_order_score,
    contradiction_resolution_score,
    latency_ms,
)


def load_dataset(path: str) -> list[dict]:
    sessions = []
    with open(path, "r", encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if line:
                sessions.append(json.loads(line))
    return sessions


def evaluate_session(session: dict, adapter: Any, top_k: int = 1) -> list[dict]:
    """Ingest memories then run every query. Returns per-query result dicts."""
    adapter.ingest(session.get("memories", []))
    storage = adapter.storage_bytes()

    results = []
    for q in session.get("queries", []):
        t0 = time.perf_counter()
        retrieved = adapter.retrieve(q["query_text"], top_k=top_k)
        t1 = time.perf_counter()

        pred_text = " ".join(m.get("text", "") for m in retrieved)
        ref_text = q.get("expected_answer", "")

        em = exact_match(pred_text, ref_text)
        sem = semantic_placeholder_score(pred_text, ref_text)

        qtype = q.get("query_type", "retrieval")
        to_score = temporal_order_score(retrieved, q.get("required_memory_ids", []))

        # Contradiction: if the dataset marks the latest revised memory, use it.
        latest_id = q.get("latest_memory_id") if qtype == "contradiction" else None
        cr_score = contradiction_resolution_score(retrieved, latest_id)

        # For pure retrieval/temporal without explicit contradiction, cr_score is neutral.
        if qtype != "contradiction":
            cr_score = 1.0

        results.append({
            "session_id": session["session_id"],
            "query_id": q["query_id"],
            "query_type": qtype,
            "exact_match": em,
            "semantic_placeholder_score": sem,
            "temporal_order_score": to_score,
            "contradiction_resolution_score": cr_score,
            "latency_ms": latency_ms(t0, t1),
            "storage_bytes": storage,
            "pred": pred_text,
            "ref": ref_text,
        })
    return results


def main():
    parser = argparse.ArgumentParser(description="BrainCore Memory Benchmark Harness")
    parser.add_argument("--adapter", required=True, help="Dotted path to adapter module (must expose `build() -> MemoryAdapter`)")
    parser.add_argument("--dataset", required=True, help="Path to JSONL dataset")
    parser.add_argument("--output", required=True, help="Path to write JSON results")
    parser.add_argument("--top_k", type=int, default=1, help="Number of memories to retrieve")
    args = parser.parse_args()

    # Dynamically import adapter module.
    module = importlib.import_module(args.adapter)
    adapter = module.build()

    sessions = load_dataset(args.dataset)
    all_results = []
    for session in sessions:
        all_results.extend(evaluate_session(session, adapter, top_k=args.top_k))

    summary = aggregate(all_results)

    payload = {
        "config": {
            "adapter": args.adapter,
            "dataset": args.dataset,
            "top_k": args.top_k,
        },
        "summary": summary,
        "per_query": all_results,
    }

    Path(args.output).parent.mkdir(parents=True, exist_ok=True)
    with open(args.output, "w", encoding="utf-8") as f:
        json.dump(payload, f, indent=2, ensure_ascii=False)

    print("BrainCore Memory Benchmark — Summary")
    print("=" * 40)
    for k, v in summary.items():
        print(f"  {k:40s}: {v}")
    print(f"\nFull results written to {args.output}")


if __name__ == "__main__":
    main()