"""Independent re-derivation of proxy answers from what the model can see (SQL, sandboxed Python, brute force)."""

import itertools
import json
import math
import re
from fractions import Fraction

from .core import run_python
from .tasks import FAMILIES

FIN_SQL = {0: """
WITH paid AS (SELECT invoice_id, SUM(amount) AS p FROM payments GROUP BY invoice_id),
bal AS (SELECT i.customer_id, (i.amount - COALESCE(p.p, 0)) * f.usd_per_unit AS usd
        FROM invoices i JOIN fx_rates f ON f.currency = i.currency LEFT JOIN paid p ON p.invoice_id = i.id
        WHERE i.status = 'open' AND julianday('2026-09-30') - julianday(i.due) > 60
          AND i.amount - COALESCE(p.p, 0) > 0.005)
SELECT (SELECT ROUND(SUM(usd), 2) FROM bal),
       (SELECT c.name FROM bal b JOIN customers c ON c.id = b.customer_id GROUP BY c.id ORDER BY SUM(usd) DESC LIMIT 1)
""", 1: """
SELECT COUNT(*), ROUND(SUM(p2.amount * f.usd_per_unit), 2)
FROM payments p2 JOIN invoices i ON i.id = p2.invoice_id JOIN fx_rates f ON f.currency = i.currency
WHERE EXISTS (SELECT 1 FROM payments p1 WHERE p1.invoice_id = p2.invoice_id AND p1.amount = p2.amount
              AND p1.id != p2.id AND julianday(p2.paid_on) - julianday(p1.paid_on) BETWEEN 0 AND 3
              AND (p1.paid_on < p2.paid_on OR (p1.paid_on = p2.paid_on AND p1.id < p2.id)))
"""}

SCI_CODE = r'''
import csv, json, math
rows = list(csv.DictReader(open("data.csv")))
def fit(xs, ys):
    n = len(xs); mx = sum(xs)/n; my = sum(ys)/n
    b = sum((x-mx)*(y-my) for x, y in zip(xs, ys)) / sum((x-mx)**2 for x in xs)
    return b, my - b*mx
k = list(rows[0])
out = {}
if k[0] == "temperature_K":
    b, a = fit([1/float(r[k[0]]) for r in rows], [math.log(float(r[k[1]])) for r in rows])
    out = {"activation_energy_kj_per_mol": -b*8.314/1000, "k_at_375K_per_s": math.exp(a + b/375)}
elif k[0] == "time_h":
    w = [r for r in rows if 0.05 <= float(r["od600"]) <= 0.5]
    b, a = fit([float(r["time_h"]) for r in w], [math.log(float(r["od600"])) for r in w])
    out = {"doubling_time_min": math.log(2)/b*60, "rows_used": len(w)}
elif k[0] == "genotype":
    c = {r["genotype"]: int(r["count"]) for r in rows}; n = sum(c.values())
    p = (2*c["AA"] + c["Aa"])/(2*n); e = [n*p*p, 2*n*p*(1-p), n*(1-p)**2]
    chi = sum((o-x)**2/x for o, x in zip([c["AA"], c["Aa"], c["aa"]], e))
    out = {"allele_frequency_A": p, "chi_square": chi, "decision": "reject" if chi > 3.841 else "fail to reject"}
else:
    g = [r for r in rows if not r["flag"]]
    b, a = fit([float(r["standard_mg_per_L"]) for r in g], [float(r["absorbance"]) for r in g])
    out = {"slope": b, "intercept": a}
print(json.dumps(out))
'''


def close(a, b):
    if isinstance(b, str):
        return a == b
    return math.isclose(a, b, rel_tol=1e-6, abs_tol=1e-9)


def main(seeds=10):
    bad = 0
    for seed in range(seeds):
        t = FAMILIES["finance-receivables"](seed)
        got = t.db.execute(FIN_SQL[t.variant]).fetchone()
        want = list(t.answer.values())
        ok = (abs(got[0] - want[0]) <= 0.02 and got[1] == want[1]) if t.variant == 0 else \
             (got[0] == want[0] and abs(got[1] - want[1]) <= 0.02)
        bad += not ok
        print("finance", seed, ok, got, want) if not ok else None

        t = FAMILIES["science-lab"](seed)
        code, out = run_python({"data.csv": t.csv, "main.py": SCI_CODE}, ["python", "main.py"])
        got = json.loads(out)
        if "intercept" in got:  # standard curve: recompute the sample from the stated absorbance
            absorb = float(re.search(r"absorbance ([\d.]+)\. Report", t.question).group(1))
            got = {"slope": got["slope"], "sample_mg_per_L": (absorb - got["intercept"]) / got["slope"]}
        ok = got.keys() == t.answer.keys() and all(close(got[k], v) for k, v in t.answer.items())
        bad += not ok
        print("science", seed, ok, got, t.answer) if not ok else None

        t = FAMILIES["math-oneshot"](seed)
        txt = t.text
        if "grid paths" in txt:
            w, h, bx, by = map(int, re.findall(r"\((\d+),(\d+)\)", txt)[1] + re.findall(r"\((\d+),(\d+)\)", txt)[2])
            grid = [[0] * (h + 1) for _ in range(w + 1)]
            for x in range(w + 1):
                for y in range(h + 1):
                    grid[x][y] = 0 if (x, y) == (bx, by) else (1 if x == y == 0 else
                                 (grid[x - 1][y] if x else 0) + (grid[x][y - 1] if y else 0))
            ok = str(grid[w][h]) == t.truth
        elif "marbles" in txt:
            red, blue = map(int, re.findall(r"(\d+) red and (\d+) blue", txt)[0])
            bag = ["r"] * red + ["b"] * blue
            draws = list(itertools.combinations(range(len(bag)), 3))
            p = Fraction(sum(1 for d in draws if sum(bag[i] == "r" for i in d) == 2), len(draws))
            ok = f"{p.numerator}/{p.denominator}" == t.truth
        elif "last two digits" in txt:
            a, b = map(int, re.findall(r"of (\d+)\^(\d+)", txt)[0])
            ok = str(a ** b)[-2:] == t.truth
        else:
            ok = True  # triples and knights are already brute-forced by the generator
        bad += not ok
        print("math", seed, ok, txt, t.truth) if not ok else None
    print("independent mismatches:", bad)


if __name__ == "__main__":
    main()