#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""test_golden_currency_gate.py — R-410's red-proof, shipped as a test.

WHAT IT PINS. Until 2026-09-01 `golden_currency_gate.py` matched `EVIDENCE_RE` against `os.listdir`
and read nothing inside the directory, so

    mkdir documentation/tests/golden-9.9.9-2026-01-01

turned the gate GREEN with no bake behind it. That was noticed while the 0.230.0 bake was running —
the evidence directory was created BEFORE the bake finished, and the gate would have passed at that
moment. **A directory name is a label; `GOLDEN_SHA256=<64 hex>` is a fact only a completed publish
produces.**

This is the gate's own instrument check: an empty directory must FAIL, a real bake log must PASS, and
a log with no sha line must FAIL. Without the last two, "it fails on an empty directory" would be
satisfied by a gate that fails on everything.

Run:  python3 scripts/test_golden_currency_gate.py
Exit 0 all pass · 1 a case failed.
"""
import io
import os
import shutil
import subprocess
import sys
import tempfile

ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
GATE = os.path.join(ROOT, "scripts", "golden_currency_gate.py")
EVIDENCE_DIR = os.path.join(ROOT, "documentation", "tests")

REAL_SHA = "9287f7cef5f13166276e8406005e3f28004004510c5184f1c1c7377f7aafad2e"


def run_gate():
    p = subprocess.run([sys.executable, GATE], capture_output=True, text=True)
    return p.returncode, p.stdout + p.stderr


def with_dir(name, files):
    """Context: create documentation/tests/<name>/ holding `files` (name -> contents), then remove it."""
    class _C(object):
        def __enter__(self):
            self.path = os.path.join(EVIDENCE_DIR, name)
            if os.path.exists(self.path):
                raise SystemExit("refusing to overwrite an existing %s" % self.path)
            os.makedirs(self.path)
            for fn, body in files.items():
                with io.open(os.path.join(self.path, fn), "w", encoding="utf-8") as fh:
                    fh.write(body)
            return self.path

        def __exit__(self, *a):
            shutil.rmtree(self.path, ignore_errors=True)
            return False
    return _C()


def main():
    if not os.path.isfile(GATE):
        print("FAIL: the gate script is missing — that is a failure, never a skip")
        return 1

    fails = []

    # --- BASELINE: what does the gate say with the tree as it is? ------------------------------
    base_rc, base_out = run_gate()
    print("baseline: gate exit %d" % base_rc)

    # --- CASE 1: an EMPTY directory with a perfect name must NOT count as a bake ----------------
    # Version 9.9.9 is far above any real release, so if it counted, the gate would go GREEN.
    with with_dir("golden-9.9.9-2026-01-01", {}):
        rc, out = run_gate()
        counted = "9.9.9" in out and "NOT counted" not in out.split("9.9.9")[0][-200:]
        if "newest golden baked        : 9.9.9" in out:
            fails.append("CASE 1: an EMPTY directory was counted as a bake — this is R-410 exactly")
        elif "NOT counted as bakes" not in out:
            fails.append("CASE 1: the empty directory was neither counted nor reported; a half-finished "
                         "bake must be VISIBLE, not silently ignored")
        else:
            print("CASE 1 ok: an empty golden-9.9.9-2026-01-01/ is rejected and named")
        _ = counted

    # --- CASE 2: a directory whose log has NO sha line must NOT count ---------------------------
    with with_dir("golden-9.9.8-2026-01-01", {"bake.log": "[golden] starting\n[golden] it all went wrong\n"}):
        rc, out = run_gate()
        if "newest golden baked        : 9.9.8" in out:
            fails.append("CASE 2: a bake log with no GOLDEN_SHA256 line was counted as a bake")
        else:
            print("CASE 2 ok: a log with no GOLDEN_SHA256 line is rejected")

    # --- CASE 3: a REAL bake log must count, and the gate must read its sha ---------------------
    # The positive control. Without it, cases 1 and 2 are satisfied by a gate that rejects everything.
    with with_dir("golden-9.9.7-2026-01-01",
                  {"bake.log": "[golden] upload OK (HTTP 201)\nGOLDEN_VERSION=9.9.7\nGOLDEN_SHA256=%s\n" % REAL_SHA}):
        rc, out = run_gate()
        if "newest golden baked        : 9.9.7" not in out:
            fails.append("CASE 3 (POSITIVE CONTROL): a real bake log was NOT counted — the gate now "
                         "rejects everything, which would make cases 1 and 2 meaningless")
        elif REAL_SHA[:12] not in out:
            fails.append("CASE 3: the gate counted the bake but did not read its sha")
        else:
            print("CASE 3 ok: a real bake log counts, and its sha is read and shown")

    # --- CASE 4: the tree is left exactly as found ----------------------------------------------
    post_rc, _ = run_gate()
    if post_rc != base_rc:
        fails.append("CASE 4: the gate's verdict changed after the test cleaned up (%d -> %d) — a test "
                     "that leaves the tree different is not a test" % (base_rc, post_rc))
    else:
        print("CASE 4 ok: the tree is unchanged; the gate's verdict is the same as the baseline")

    if fails:
        print()
        for f in fails:
            print("FAIL: %s" % f)
        return 1
    print("\ngolden-currency gate self-test OK — a directory name alone cannot satisfy it (R-410)")
    return 0


sys.exit(main())