"""Cells for wizard-work/beam/expr_eval.py -- graded by beam/CHECK.

Binding (Q133, 2026-10-31): shipped as `sys.path.insert(0, '/root/.hermes/...')`,
an absolute path to a *host copy* of the module.  It graded whatever sat there,
and worse, it put that directory at sys.path[0] for the whole lane process --
`test_interval_overlap.py` then imported the host's pre-Q84 `interval_overlap`,
so two cells written for the repaired module read red while the repair was
present and correct in this tree.  The cell now imports the module beside it
and asserts that it did.
"""
import math
import sys
from pathlib import Path

HERE = Path(__file__).resolve().parent
sys.path.insert(0, str(HERE))

import expr_eval as _exprmod  # noqa: E402
from expr_eval import evaluate, EvalError  # noqa: E402

assert Path(_exprmod.__file__).resolve().parent == HERE, _exprmod.__file__

cases = [
    ("2+3*4", 14.0),
    ("(2+3)*4", 20.0),
    ("2**3**2", 512.0),  # right assoc
    ("10 // 3", 3.0),
    ("10 % 3", 1.0),
    ("-5 + 2", -3.0),
    ("2*-3", -6.0),
    ("sqrt(16)+abs(-2)", 6.0),
    ("max(1,5,2)", 5.0),
    ("sin(0)", 0.0),
    ("2**0.5", math.sqrt(2)),
    ("1e3 + 0.5", 1000.5),
]
for expr, exp in cases:
    got = evaluate(expr)
    assert got == exp, (expr, got, exp)
    print("OK", expr, got)

# variables
assert evaluate("x*2 + pi", {'x': 4, 'pi': math.pi}) == 8 + math.pi
# errors
for bad in ["2 +", "foo", "1/0", "sin(1,2)", "2 **", "abc("]:
    try:
        evaluate(bad)
        print("FAIL no error:", bad)
        sys.exit(1)
    except EvalError as e:
        print("ERR ok:", bad, "->", e)
print("ALL PASS")