"""Preflight for the fal beautify engine — readiness check, NO network/paid call.

Verifies everything needed BEFORE spending a real fal call: Python deps, the face
detector, the local image steps (mask + skin grain on a synthetic image), and
whether FAL_KEY is present. It never contacts fal and never prints the key.

Exit 0 = ready for a real run; exit 1 = something is missing (see report).
"""
from __future__ import annotations

import importlib.util
import sys
from io import BytesIO
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parents[1]))


def _check(label, ok, detail=""):
    mark = "PASS" if ok else "FAIL"
    print(f"[{mark}] {label}{(' - ' + detail) if detail else ''}")
    return ok


def main() -> int:
    print("fal beautify preflight (no network, no paid call)\n")
    ok = True

    # 1) Python deps
    for mod in ("httpx", "PIL", "numpy"):
        ok &= _check(f"dep: {mod}", importlib.util.find_spec(mod) is not None)
    for mod in ("insightface", "onnxruntime", "cv2"):
        present = importlib.util.find_spec(mod) is not None
        _check(f"dep (face detect): {mod}", present,
               "" if present else "needed for face/gender detection")
        ok &= present

    # 2) Engine imports
    try:
        from app.services.falinpaint_beautify import beautify_with_fal  # noqa: F401
        from app.services.falinpaint_client import FalInpaintBeautifyClient  # noqa: F401
        from app.services.gemini_client import add_skin_grain, build_beautify_inpaint_mask
        _check("engine imports", True)
    except Exception as exc:  # noqa: BLE001
        return 1 if not _check("engine imports", False, str(exc)) else 1

    # 3) Local image steps work on a synthetic image (no network)
    try:
        from PIL import Image
        buf = BytesIO(); Image.new("RGB", (200, 260), (120, 110, 100)).save(buf, "PNG")
        png = buf.getvalue()
        m = build_beautify_inpaint_mask((200, 260), (60, 60, 80, 110))
        mbuf = BytesIO(); m.save(mbuf, "PNG")
        grained = add_skin_grain(png, mbuf.getvalue(), amount=10)
        steps_ok = (m.size == (200, 260)) and (len(grained) > 0)
        ok &= _check("local steps (mask + skin grain)", steps_ok)
    except Exception as exc:  # noqa: BLE001
        ok &= _check("local steps (mask + skin grain)", False, str(exc))

    # 4) Provider selection + FAL_KEY presence (value never printed)
    try:
        from app.services.fal_client import fal_real_enabled
        from app.services.falinpaint_beautify import fal_inpaint_model
        key_present = fal_real_enabled()
        print(f"[{'PASS' if key_present else 'WARN'}] FAL_KEY present"
              + ("" if key_present else " - set FAL_KEY before a real run (this shell only)"))
        print(f"[INFO] fal model = {fal_inpaint_model()}")
        print(f"[INFO] real run possible now = {key_present}")
    except Exception as exc:  # noqa: BLE001
        ok &= _check("provider check", False, str(exc))

    print("\n" + ("READY: deps/engine/local steps OK." if ok else "NOT READY: fix FAIL items above."))
    print("(A real beautify still needs FAL_KEY + the operator to run it.) "
          "Pilot Ready: NOT CONFIRMED.")
    return 0 if ok else 1


if __name__ == "__main__":
    sys.exit(main())