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"""Replay every task against a running server: admission examples, oracle, wrong and budget paths.

Usage: python scripts/replay.py --url http://localhost:8000 [--seeds 3] [--out reports/replay.json]
"""

import argparse
import json
import sys
import time
from pathlib import Path
from urllib.request import urlopen

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

from five_desks.tasks import TASK_IDS, build  # noqa: E402
from wsclient import Session  # noqa: E402

EXAMPLE_ACTIONS = [{"tool": "list"}, {"tool": "submit", "answer": {}}]


def wrong(value):
    if isinstance(value, bool):
        return not value
    if isinstance(value, (int, float)):
        return value * 1.5 + 7
    if isinstance(value, list):
        return value[:-1] + ["P999"]
    return str(value) + "-wrong"


def run(url: str, seeds: int) -> dict:
    with urlopen(f"{url}/schema", timeout=15) as response:
        schema = json.load(response)
    report = {"url": url, "episodes": 0, "failures": [], "schema": {k: schema[k] for k in ("action", "observation")}}
    started = time.monotonic()

    def fail(msg):
        report["failures"].append(msg)

    for task_id in TASK_IDS:
        # 1. Admission: the example actions without a seed must end with a terminal reward in [0, 1].
        with Session(url) as s:
            s.reset(task_id=task_id)
            data = None
            for action in EXAMPLE_ACTIONS:
                data = s.step(action)
                if data["done"]:
                    break
            if not data["done"] or not 0 <= data["reward"] <= 1:
                fail(f"{task_id}: example actions did not terminate: {data}")
            report["episodes"] += 1
        for seed in range(seeds):
            inst = build(task_id, seed)
            answer = {p.key: p.expected for p in inst.parts}
            # 2. Oracle path: read every file, use calc, submit the right answer -> 1.0.
            with Session(url) as s:
                obs = s.reset(task_id=task_id, seed=seed)
                if obs["done"] or "Submit exactly" not in obs["observation"]["output"]:
                    fail(f"{task_id}/{seed}: bad reset {obs}")
                for name in inst.files:
                    out = s.step({"tool": "read", "path": name})["observation"]["output"]
                    if out.strip() != inst.files[name].strip():
                        fail(f"{task_id}/{seed}: read {name} mismatch")
                calc = s.step({"tool": "calc", "expr": "(2+3)*4"})["observation"]["output"]
                if calc != "= 20":
                    fail(f"{task_id}/{seed}: calc returned {calc!r}")
                data = s.step({"tool": "submit", "answer": answer})
                if not data["done"] or data["reward"] != 1.0:
                    fail(f"{task_id}/{seed}: oracle reward {data.get('reward')}")
                after = s.step({"tool": "list"})
                if not after["done"]:
                    fail(f"{task_id}/{seed}: step after submit did not stay done")
            # 3. Wrong answers -> < 1; one right part -> partial credit.
            with Session(url) as s:
                s.reset(task_id=task_id, seed=seed)
                bad = {k: wrong(v) for k, v in answer.items()}
                data = s.step({"tool": "submit", "answer": bad})
                if not data["done"] or data["reward"] >= 0.5:
                    fail(f"{task_id}/{seed}: wrong answer reward {data['reward']}")
            with Session(url) as s:
                s.reset(task_id=task_id, seed=seed)
                first = inst.parts[0].key
                partial = {k: (v if k == first else wrong(v)) for k, v in answer.items()}
                data = s.step({"tool": "submit", "answer": partial})
                if not 0 < data["reward"] < 1:
                    fail(f"{task_id}/{seed}: partial reward {data['reward']}")
            # 4. Budget: never submitting ends the episode at reward 0.
            with Session(url) as s:
                s.reset(task_id=task_id, seed=seed)
                data = None
                for _ in range(inst.max_steps):
                    data = s.step({"tool": "calc", "expr": "1+1"})
                if not data["done"] or data["reward"] != 0:
                    fail(f"{task_id}/{seed}: budget end {data}")
            report["episodes"] += 5
    report["seconds"] = round(time.monotonic() - started, 1)
    report["passed"] = not report["failures"]
    return report


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--url", default="http://localhost:8000")
    parser.add_argument("--seeds", type=int, default=2)
    parser.add_argument("--out", default="")
    args = parser.parse_args()
    report = run(args.url.rstrip("/"), args.seeds)
    if args.out:
        Path(args.out).parent.mkdir(parents=True, exist_ok=True)
        Path(args.out).write_text(json.dumps(report, indent=2) + "\n")
    print(json.dumps({k: report[k] for k in ("passed", "episodes", "seconds")}), "failures:", report["failures"][:10])
    sys.exit(0 if report["passed"] else 1)


if __name__ == "__main__":
    main()