#!/usr/bin/env python3
"""CPU validation of the eval cut: testset integrity, checker-aware grading
path (stdin + SPJ + function_call), pass@k math, resume logic. Exit 0 = pass."""
import json, math, os, subprocess, sys, tempfile

HERE = os.path.dirname(os.path.abspath(__file__))
PASS = FAIL = 0
def check(name, ok, detail=""):
    global PASS, FAIL
    ok = bool(ok); PASS += ok; FAIL += (not ok)
    print(f"{'PASS' if ok else 'FAIL'}  {name}" + (f"  [{detail}]" if detail and not ok else ""))

rows = [json.loads(l) for l in open(os.path.join(HERE, "testset.jsonl"))]
meta = json.load(open(os.path.join(HERE, "testset_meta.json")))
check("T1 657 problems", len(rows) == 657)
from collections import Counter
sets_ = Counter(r["set"] for r in rows)
check("T2 set sizes", sets_ == Counter({"h_unsolved": 337, "dev": 200, "h_frontier": 120}), str(sets_))
n_ck = sum(1 for r in rows if r["test_cases"].get("checker"))
check("T3 22 SPJ checkers inline", n_ck == 22, n_ck)
check("T4 every row has question+suite",
      all(r["question"] and r["test_cases"].get("inputs") for r in rows))
check("T5 time_limit=10 everywhere", all(r["test_cases"]["time_limit"] == 10.0 for r in rows))
import hashlib
check("T6 sha matches meta", hashlib.sha256(open(os.path.join(HERE, "testset.jsonl"), "rb").read()).hexdigest() == meta["sha256"])

# grading path: synthetic mini-testset through eval_grade.py
with tempfile.TemporaryDirectory(dir="/var/tmp") as td:
    ts = os.path.join(td, "ts.jsonl")
    with open(ts, "w") as f:
        f.write(json.dumps({"id": "t1", "set": "dev", "subset": "x", "format": "stdin_stdout",
                            "question": "q", "starter_code": "", "fn_name": "",
                            "test_cases": {"inputs": ["1 2\n"], "outputs": ["3\n"],
                                           "time_limit": 10.0}}) + "\n")
        f.write(json.dumps({"id": "t2", "set": "dev", "subset": "x", "format": "stdin_stdout",
                            "question": "q", "starter_code": "", "fn_name": "",
                            "test_cases": {"inputs": ["3\n"], "outputs": ["1 2\n"], "time_limit": 10.0,
                                           "checker": "import sys\ni=open(sys.argv[1]).read().split()\ns=open(sys.argv[3]).read().split()\nprint(1 if len(s)==2 and sum(map(int,s))==int(i[0]) else 0)"}}) + "\n")
        f.write(json.dumps({"id": "t3", "set": "dev", "subset": "x", "format": "function_call",
                            "question": "q", "starter_code": "def add(n, m):\n    ",
                            "fn_name": "add",
                            "test_cases": {"inputs": ["n = 1\nm = 2"], "outputs": ["3"], "time_limit": 10.0}}) + "\n")
    sm = os.path.join(td, "s.jsonl")
    with open(sm, "w") as f:
        f.write(json.dumps({"id": "t1", "k": 0, "text": "```python\na,b=map(int,input().split());print(a+b)\n```"}) + "\n")
        f.write(json.dumps({"id": "t1", "k": 1, "text": "```python\nprint(0)\n```"}) + "\n")
        f.write(json.dumps({"id": "t2", "k": 0, "text": "```python\nn=int(input());print(2, n-2)\n```"}) + "\n")
        f.write(json.dumps({"id": "t3", "k": 0, "text": "```python\ndef add(n,m):\n    return n+m\n```"}) + "\n")
    gr = os.path.join(td, "g.jsonl")
    r = subprocess.run([sys.executable, os.path.join(HERE, "eval_grade.py"),
                        "--testset", ts, "--samples", sm, "--out", gr, "--workers", "4"],
                       capture_output=True, text=True, timeout=300)
    g = {(x["id"], x["k"]): x["passed"] for x in map(json.loads, open(gr))} if os.path.exists(gr) else {}
    check("T7 stdin exact pass", g.get(("t1", 0)) is True, r.stderr[-200:])
    check("T8 stdin wrong fails", g.get(("t1", 1)) is False)
    check("T9 SPJ alt answer passes via checker", g.get(("t2", 0)) is True, str(g))
    check("T10 function_call passes", g.get(("t3", 0)) is True, str(g))
    n0 = sum(1 for _ in open(gr))
    r2 = subprocess.run([sys.executable, os.path.join(HERE, "eval_grade.py"),
                         "--testset", ts, "--samples", sm, "--out", gr, "--workers", "4"],
                        capture_output=True, text=True, timeout=120)
    check("T11 resume: no regrade", sum(1 for _ in open(gr)) == n0 and "0 to grade" in r2.stdout, r2.stdout[:120])

# pass@k estimator
sys.path.insert(0, HERE)
from eval_report import pass_at_k
check("T12 pass@k math", abs(pass_at_k(16, 1, 1) - 1/16) < 1e-9
      and pass_at_k(16, 0, 16) == 0.0 and pass_at_k(16, 1, 16) == 1.0
      and abs(pass_at_k(4, 2, 2) - (1 - math.comb(2,2)/math.comb(4,2))) < 1e-9)

print(f"\n{PASS} passed, {FAIL} failed")
sys.exit(1 if FAIL else 0)