"""Logic for the `godot` domain. Transport-agnostic (D-263).

Ported from two bash scripts. What was shell — running the engine — stays a
guarded exec; what was grep pipelines deciding a verdict is Python now, which
is the whole point: these filters encode five separate hard-won lessons and
each was a comment in a pipeline nobody could test.
"""

from __future__ import annotations

import re

from tooling.core import config, console, process
from tooling.domains.godot.schemas import ParseResult

# The GDScript half only OPENS files; it makes no verdict, because no Godot API
# reports parse failure reliably — one segfaults, one false-positives 150/226,
# and plain load() returns non-null for a broken script. The engine's own
# stderr is the only honest signal, so the verdict is scraped from it.
_SWEEP_RAN = re.compile(r"^parse-sweep: opened", re.MULTILINE)
_SWEEP_ERRORS = re.compile(r"Parse Error|Failed to load script")
_COLD_ERRORS = re.compile(r"^(SCRIPT )?ERROR|Parse Error|Export type", re.IGNORECASE)

# Imported assets "fail loading" on a cold tree before the import pass; that is
# noise, not a parse failure.
_ASSET_NOISE = "Failed loading resource: res://assets"

# Filtered by cold-parse ONLY. Deliberately NOT filtered by the sweep: that
# suppression is why cold-parse stayed silent about a test helper that
# genuinely does not parse — the muted class was hiding a real failure.
_COLD_ONLY_NOISE = (
    "Cannot infer the type",
)
_COLD_NOT_DECLARED = re.compile(
    r'(Messagepack|LocalBridge|ServerProcess|Constants)" not declared'
)


def parse_sweep() -> ParseResult:
    """Open every project .gd and report any that will not parse."""
    result = _godot("-s", "res://tools/parse_sweep.gd")
    if result.returncode != 0:
        return ParseResult(
            engine_failed=True,
            engine_exit=result.returncode,
            lines=_tail(result),
        )

    raw = result.stdout + result.stderr
    if not _SWEEP_RAN.search(raw):
        # Without this the sweep could silently stop walking — a renamed script
        # or a broken loop yields zero error lines, which reads as clean. That
        # is the same false-green this tool exists to close.
        return ParseResult(
            did_not_run=True,
            lines=_tail(result),
        )

    summary = next(
        (line for line in raw.splitlines() if line.startswith("parse-sweep: opened")), ""
    )
    errors = [
        line
        for line in raw.splitlines()
        if _SWEEP_ERRORS.search(line) and _ASSET_NOISE not in line
    ]
    return ParseResult(summary=summary, lines=errors)


def cold_parse(run_menu: bool = False) -> ParseResult:
    """Cold-cache startup parse — the class_name/autoload registration race."""
    client = config.path("client")
    cache = client / ".godot" / "global_script_class_cache.cfg"
    cache.unlink(missing_ok=True)

    imported = client / ".godot" / "imported"
    if not imported.is_dir() or not any(imported.iterdir()):
        # A truly cold checkout has no import cache, and every imported asset
        # then "fails loading" during the parse run — a wall of false
        # positives. Found live in a fresh worktree, 2026-07-13.
        console.event("no import cache — running one-time import pass", level="warn")
        seeded = _godot("--import")
        if seeded.returncode != 0:
            return ParseResult(
                engine_failed=True, engine_exit=seeded.returncode, lines=_tail(seeded)
            )

    result = _godot("--quit")
    if result.returncode != 0:
        return ParseResult(
            engine_failed=True, engine_exit=result.returncode, lines=_tail(result)
        )

    errors = _cold_filter((result.stdout + result.stderr).splitlines())

    if run_menu:
        # No exit-code check: `timeout` kills the menu by design, so only the
        # scraped lines carry signal for this bounded run.
        menu = process.run(
            ["timeout", "10", "godot", "--path", str(client), "res://scenes/main_menu.tscn"],
            check=False,
            missing_fix="install Godot — make setup-godot",
        )
        errors += _cold_filter((menu.stdout + menu.stderr).splitlines())

    # Restore a FULL class cache before returning. The cold run re-seeds it only
    # partially — addon classes are missing, which leaves the gdUnit4 runner
    # unable to start at all (0 tests in ~350ms; found live when the push gate
    # ran the suite straight after this check, 2026-07-14). The verdict above is
    # already decided; this just leaves the tree runnable.
    _godot("--import")

    return ParseResult(lines=errors)


def _cold_filter(lines: list[str]) -> list[str]:
    return [
        line
        for line in lines
        if _COLD_ERRORS.search(line)
        and _ASSET_NOISE not in line
        and not any(noise in line for noise in _COLD_ONLY_NOISE)
        and not _COLD_NOT_DECLARED.search(line)
    ]


def _godot(*args: str):
    return process.run(
        ["godot", "--headless", "--path", str(config.path("client")), *args],
        check=False,
        missing_fix="install Godot — make setup-godot",
    )


def _tail(result, count: int = 20) -> list[str]:
    return (result.stdout + result.stderr).splitlines()[-count:]