from __future__ import annotations

import asyncio
import json
import os
from datetime import datetime, timezone
from pathlib import Path
from typing import Any
from uuid import uuid4

from albedo_config import JudgeSettings
from albedo_config.models import JUDGE_MODELS
from albedo_eval_service.judge_api import (
    JudgeSample,
    ObservationSimulationService,
    QuestionPrepStore,
    QuestionService,
    ReferenceTrajectoryService,
    RepoContextClient,
    ScoreBatchRequest,
    _score_samples,
)
from albedo_eval_service.judge_core import aggregate_scores, challenger_beats_king
from albedo_eval_service.judge_llm_client import JudgeLLMClient

from .constants import DEFAULT_DATA_ROOT, DEFAULT_RUNS_DIR
from .samples import load_samples

DEFAULT_JUDGE_RUN = Path("/workspace/data/eval-runs/20260824T182728Z-cdd1388b")
SOTA_TURNS = 8
# 8 SOTA + ~7 sims + 4 checklist/behavior + 1 prune + 2 sides
ESTIMATED_CALLS_PER_SAMPLE = 22


def promote_openrouter_key() -> str:
    """Accept OPENROUTER_API_KEY as a synonym for the official judge setting."""
    key = (os.environ.get("ALBEDO_JUDGE_OPENROUTER_API_KEY") or "").strip()
    if key:
        return key
    fallback = (os.environ.get("OPENROUTER_API_KEY") or "").strip()
    if fallback:
        os.environ["ALBEDO_JUDGE_OPENROUTER_API_KEY"] = fallback
        return fallback
    return ""


def require_openrouter_key() -> str:
    key = promote_openrouter_key()
    if key:
        return key
    raise SystemExit(
        "Live judge needs ALBEDO_JUDGE_OPENROUTER_API_KEY (OpenRouter, model z-ai/glm-5.2).\n"
        "export ALBEDO_JUDGE_OPENROUTER_API_KEY=... && python -m local_eval judge "
        f"--run {DEFAULT_JUDGE_RUN} --limit 2"
    )


def load_duel_rows(run_dir: Path) -> list[dict[str, Any]]:
    path = Path(run_dir) / "generated-samples.jsonl"
    if not path.is_file():
        raise SystemExit(f"no generated-samples.jsonl under {run_dir}")
    rows = []
    for line in path.read_text().splitlines():
        if line.strip():
            rows.append(json.loads(line))
    if not rows:
        raise SystemExit(f"empty generated-samples.jsonl under {run_dir}")
    return rows


def load_verdict(run_dir: Path) -> dict[str, Any]:
    path = Path(run_dir) / "verdict.json"
    if not path.is_file():
        return {}
    return json.loads(path.read_text())


def load_judge_samples(
    run_dir: Path,
    *,
    dataset_root: Path = DEFAULT_DATA_ROOT,
    seed: str | None = None,
    limit: int = 0,
) -> tuple[list[JudgeSample], dict[str, Any], list[str]]:
    """Rebuild official JudgeSamples from a local duel run.

    Submit salt is applied on the *full* run sample list so a --limit slice
    keeps the same markers the models actually saw.
    """
    run_dir = Path(run_dir)
    verdict = load_verdict(run_dir)
    rows = load_duel_rows(run_dir)
    seed = seed or str(verdict.get("seed") or "local-eval")
    all_ids = list(verdict.get("sample_ids") or [row["sample_id"] for row in rows])
    prefixes = load_samples(
        Path(dataset_root),
        sample_ids=all_ids,
        sample_count=len(all_ids),
        seed=seed,
    )
    by_id = {sample.sample_id: sample for sample in prefixes}
    usable = [
        row
        for row in rows
        if row.get("sample_id") in by_id
        and row.get("previous_king_output")
        and row.get("challenger_output")
        and not row.get("king_error")
        and not row.get("chal_error")
    ]
    if limit > 0:
        usable = usable[:limit]
    warnings: list[str] = []
    samples: list[JudgeSample] = []
    for row in usable:
        prefix = by_id[row["sample_id"]]
        stored_marker = str(row.get("submit_marker") or "")
        if stored_marker and stored_marker != prefix.submit_marker:
            warnings.append(
                f"{row['sample_id']}: reloaded marker {prefix.submit_marker!r} "
                f"!= stored {stored_marker!r}"
            )
        samples.append(
            JudgeSample(
                sample_id=prefix.sample_id,
                prompt=prefix.prompt,
                previous_king_output=row["previous_king_output"],
                challenger_output=row["challenger_output"],
                messages=prefix.messages,
                submit_marker=stored_marker or prefix.submit_marker,
                submit_command=str(row.get("submit_command") or prefix.submit_command),
            )
        )
    return samples, verdict, warnings


def preview_samples(samples: list[JudgeSample]) -> list[dict[str, Any]]:
    return [
        {
            "sample_id": sample.sample_id,
            "prompt_chars": len(sample.prompt or ""),
            "messages": len(sample.messages or []),
            "king_chars": len(sample.previous_king_output or ""),
            "chal_chars": len(sample.challenger_output or ""),
            "submit_marker": sample.submit_marker,
        }
        for sample in samples
    ]


def _settings() -> JudgeSettings:
    promote_openrouter_key()
    return JudgeSettings()


async def _score(request: ScoreBatchRequest, settings: JudgeSettings) -> list[dict[str, Any]]:
    client = JudgeLLMClient(settings)
    repo = RepoContextClient(settings) if settings.repo_context_url else None
    try:
        simulator = ObservationSimulationService(settings, client, repo)
        questions = QuestionService(
            settings,
            client,
            ReferenceTrajectoryService(settings, client, simulator),
        )
        store = QuestionPrepStore(settings, questions)
        return await _score_samples(
            client=client, request=request, settings=settings, prep_store=store
        )
    finally:
        await client.aclose()
        if repo is not None:
            await repo.aclose()


def run_judge(
    *,
    run_dir: Path = DEFAULT_JUDGE_RUN,
    dataset_root: Path = DEFAULT_DATA_ROOT,
    seed: str | None = None,
    limit: int = 2,
    dry_run: bool = False,
    out_dir: Path | None = None,
) -> dict[str, Any]:
    samples, verdict, warnings = load_judge_samples(
        run_dir, dataset_root=dataset_root, seed=seed, limit=limit
    )
    if not samples:
        raise SystemExit(f"no scorable king+challenger pairs under {run_dir}")
    preview = preview_samples(samples)
    report: dict[str, Any] = {
        "mode": "official_glm_checklist",
        "source_run": str(Path(run_dir).resolve()),
        "source_run_id": verdict.get("run_id"),
        "source_proxy_challenger": verdict.get("score_challenger"),
        "source_proxy_king": verdict.get("score_king"),
        "seed": seed or verdict.get("seed") or "local-eval",
        "judge_models": list(JUDGE_MODELS),
        "sota_turns": SOTA_TURNS,
        "sample_count": len(samples),
        "estimated_llm_calls": len(samples) * ESTIMATED_CALLS_PER_SAMPLE,
        "sample_ids": [sample.sample_id for sample in samples],
        "preview": preview,
        "warnings": warnings,
        "note": (
            "Official score-batch path: GLM-5.2 SOTA reference (8 turns, LLM-sim observations "
            "unless ALBEDO_JUDGE_REPO_CONTEXT_URL is set), checklist, then yes/no judge on "
            "both stored trajectories. This is not proxy_score."
        ),
    }
    print(json.dumps({k: report[k] for k in report if k != "preview"}, indent=2), flush=True)
    for row in preview:
        print(
            f"  {row['sample_id']} prompt={row['prompt_chars']} "
            f"king={row['king_chars']} chal={row['chal_chars']} "
            f"marker={row['submit_marker']!r}",
            flush=True,
        )
    if dry_run:
        report["state"] = "dry_run"
        return report

    require_openrouter_key()
    settings = _settings()
    eval_run_id = (
        datetime.now(timezone.utc).strftime("%Y%m%dT%H%M%SZ") + "-judge-" + uuid4().hex[:8]
    )
    request = ScoreBatchRequest(
        eval_run_id=eval_run_id,
        batch_id="score-0001",
        samples=samples,
        total_sample_count=len(samples),
        judge_models=list(JUDGE_MODELS),
    )
    print(
        f"live judge start run={eval_run_id} samples={len(samples)} "
        f"models={list(JUDGE_MODELS)} (~{report['estimated_llm_calls']} LLM calls)",
        flush=True,
    )
    records = asyncio.run(_score(request, settings))
    summary = aggregate_scores(records, min_valid_fraction=settings.min_valid_fraction)
    dest = Path(out_dir or run_dir)
    dest.mkdir(parents=True, exist_ok=True)
    (dest / "official-judge.json").write_text(
        json.dumps({**report, "eval_run_id": eval_run_id, **summary}, indent=2) + "\n"
    )
    with (dest / "official-judge-records.jsonl").open("w") as handle:
        for record in records:
            handle.write(json.dumps(record, ensure_ascii=False) + "\n")
    per_sample = [
        {
            "sample_id": record.get("sample_id"),
            "scored": record.get("scored"),
            "king_score": record.get("king_score"),
            "challenger_score": record.get("challenger_score"),
            "error": record.get("error"),
            "n_questions": len(record.get("questions") or []),
        }
        for record in records
    ]
    result = {
        **report,
        "eval_run_id": eval_run_id,
        **summary,
        "per_sample": per_sample,
        "artifacts": str(dest),
    }
    if summary.get("score_challenger") is not None and summary.get("score_king") is not None:
        result["challenger_won"] = challenger_beats_king(
            float(summary["score_challenger"]), float(summary["score_king"])
        )
    print(json.dumps({k: result[k] for k in result if k not in {"preview"}}, indent=2), flush=True)
    print(f"artifacts: {dest}/official-judge.json", flush=True)
    return result


def latest_run(runs_dir: Path = DEFAULT_RUNS_DIR) -> Path:
    runs = sorted(
        (p for p in Path(runs_dir).iterdir() if (p / "generated-samples.jsonl").is_file()),
        key=lambda p: p.name,
        reverse=True,
    )
    if not runs:
        raise SystemExit(f"no duel runs with generated-samples.jsonl under {runs_dir}")
    return runs[0]