#!/usr/bin/env python3
"""Deterministic local checks for the three design-direction coded slices."""
from __future__ import annotations

import hashlib
import json
import struct
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
DIRECTIONS = {
    "ledger-studio": ("ledger-desktop.png", "ledger-mobile.png"),
    "signal-trace": ("signal-desktop.png", "signal-mobile.png"),
    "field-manual": ("manual-desktop.png", "manual-mobile.png"),
}
REQUIRED = (
    "개념을 알고 있어요",
    "증상만 알고 있어요",
    "Predict",
    "Observe",
    "Compare",
    "Explain",
    "Transfer",
)


def sha256(path: Path) -> str:
    return hashlib.sha256(path.read_bytes()).hexdigest()


def png_size(path: Path) -> tuple[int, int]:
    raw = path.read_bytes()[:24]
    if len(raw) != 24 or raw[:8] != b"\x89PNG\r\n\x1a\n" or raw[12:16] != b"IHDR":
        raise AssertionError(f"not a PNG: {path}")
    return struct.unpack(">II", raw[16:24])


def main() -> None:
    records = []
    previews = ROOT / "previews"
    for direction, (desktop_name, mobile_name) in DIRECTIONS.items():
        folder = ROOT / "directions" / direction
        html = folder / "index.html"
        concept = folder / "concept.yaml"
        assert html.is_file(), html
        assert concept.is_file(), concept
        source = html.read_text(encoding="utf-8")
        for marker in REQUIRED:
            assert marker in source, f"{direction}: missing {marker}"
        assert "focus-visible" in source, f"{direction}: focus style missing"
        assert "prefers-reduced-motion" in source, f"{direction}: reduced-motion missing"
        assert "http://" not in source and "https://" not in source, f"{direction}: external dependency"
        desktop = previews / desktop_name
        mobile = previews / mobile_name
        assert png_size(desktop) == (1280, 1100), f"{desktop}: wrong dimensions"
        assert png_size(mobile) == (390, 844), f"{mobile}: wrong dimensions"
        records.append({
            "direction": direction,
            "coded_slice_sha256": sha256(html),
            "concept_sha256": sha256(concept),
            "desktop_sha256": sha256(desktop),
            "mobile_sha256": sha256(mobile),
        })
    gallery = previews / "comparison.png"
    assert gallery.is_file(), gallery
    width, height = png_size(gallery)
    assert width >= 1500 and height >= 1000, "comparison preview is not full-size"
    print(json.dumps({
        "status": "pass",
        "representative_screen": "dual-entry-shared-lab",
        "directions": records,
        "comparison": {"sha256": sha256(gallery), "size": [width, height]},
    }, ensure_ascii=False, sort_keys=True))


if __name__ == "__main__":
    main()