# -*- coding: utf-8 -*-
"""v0.126.0 mojibake gate — double-encoded UTF-8 can never enter the source again.

A bash-era in-place sweep once mangled Hungarian text by re-encoding already-encoded
UTF-8 (the "Tárhely"-class defect: á → á). Legitimate Hungarian UTF-8 NEVER decodes
to the signature characters below, so any hit is a defect. The allowlist is ZERO by
design — fix the text, don't allowlist it. (Windows grep false-negatives multibyte —
this gate is Python by the multibyte rule, like emoji_gate.)

Scans every template (web + setup) and every Go source file:
  - the file must decode as strict UTF-8 (undecodable bytes = broken already), and
  - the decoded text must contain none of the double-encoding signature characters:
      Ã (U+00C3)  Â (U+00C2)  Ă (U+0102)  ă (U+0103)  ˘ (U+02D8)  ˇ (U+02C7)

Run from controller/:  python scripts/mojibake_gate.py
Exit 1 on any hit.
"""
import io, os, sys

ROOTS = [
    os.path.join("internal", "web", "templates"),
    os.path.join("internal", "setup", "templates"),
    "internal",  # every .go string literal / comment
    "cmd",
]

SIGNATURE = {
    "Ã": "Ã (a-tilde — á/é/í/ó/ö/ő/ú/ü/ű double-encoded)",
    "Â": "Â (a-circumflex — NBSP/degree-sign double-encoded)",
    "Ă": "Ă (a-breve — cp1250 round-trip)",
    "ă": "ă (a-breve lowercase — cp1250 round-trip)",
    "˘": "˘ (breve — cp1250 round-trip)",
    "ˇ": "ˇ (caron — cp1250 round-trip)",
}

EXTS = (".html", ".css", ".js", ".go")


def files():
    seen = set()
    for root in ROOTS:
        if not os.path.isdir(root):
            continue
        for dirpath, dirnames, names in os.walk(root):
            for n in names:
                p = os.path.join(dirpath, n)
                if p in seen or not n.endswith(EXTS):
                    continue
                seen.add(p)
                yield p


failures = []
count = 0
for path in files():
    count += 1
    raw = io.open(path, "rb").read()
    try:
        text = raw.decode("utf-8")
    except UnicodeDecodeError as e:
        failures.append("%s: not valid UTF-8 (%s)" % (path, e))
        continue
    for ln, line in enumerate(text.split("\n"), 1):
        for ch, why in SIGNATURE.items():
            if ch in line:
                failures.append("%s:%d: mojibake signature %s in %r" % (path, ln, why, line.strip()[:120]))

if failures:
    print("mojibake_gate: FAIL (allowlist is zero — fix the text)")
    for f in failures:
        print("  - " + f)
    sys.exit(1)
print("mojibake_gate: OK (%d files clean — no double-encoding signatures)" % count)