"""Custom palette: one brand hex in, light + dark accent tokens out, readable in both modes."""
import importlib.util
import subprocess
import sys
from pathlib import Path

PALETTE = Path(__file__).resolve().parents[1] / "rpa-dashboard-no-ai" / "templates" / "palette.py"
spec = importlib.util.spec_from_file_location("palette", PALETTE)
palette = importlib.util.module_from_spec(spec)
spec.loader.exec_module(palette)

# Fixed Tebra Sky base colours the derived accents sit on (from dashboard.html).
LIGHT_BG, DARK_BG = "#eaf6fb", "#182a38"
LIGHT_INK, DARK_INK = "#1c2b33", "#e6eef4"
LOG_ERROR = "#f68c82"  # dimmest log text colour


def contrast(a, b):
    def lum(h):
        c = [int(h[i:i + 2], 16) / 255 for i in (1, 3, 5)]
        c = [x / 12.92 if x <= 0.03928 else ((x + 0.055) / 1.055) ** 2.4 for x in c]
        return 0.2126 * c[0] + 0.7152 * c[1] + 0.0722 * c[2]
    hi, lo = sorted([lum(a), lum(b)], reverse=True)
    return (hi + 0.05) / (lo + 0.05)


def test_derived_palette_is_readable_in_light_and_dark():
    for brand in ["#3d9bd0", "#ffd400", "#0b1f4d", "#7a3cff", "#e4002b", "#00a651", "#ffffff", "#000000"]:
        t = palette.derive(brand)
        for mode, bg, ink in [("light", LIGHT_BG, LIGHT_INK), ("dark", DARK_BG, DARK_INK)]:
            m = t[mode]
            assert contrast("#ffffff", m["--accent"]) >= 3, (brand, mode, "button text")
            assert contrast("#ffffff", m["--accent-2"]) >= 3, (brand, mode, "button text, light end")
            assert contrast(m["--accent"], bg) >= 3, (brand, mode, "accent text")
            assert contrast(ink, m["--accent-soft"]) >= 4.5, (brand, mode, "secondary button text")
            assert contrast(LOG_ERROR, m["--accent-dark"]) >= 4.5, (brand, mode, "log text")


def test_brand_kept_when_it_already_passes():
    assert palette.derive("#1f6fb2")["light"]["--accent"] == "#1f6fb2"


def test_cli_prints_both_token_blocks_and_contrast_table():
    out = subprocess.run([sys.executable, str(PALETTE), "#7a3cff"], capture_output=True, text=True, check=True).stdout
    assert "body{" in out and "body.dark{" in out and "PASS" in out and "FAIL" not in out