#!/usr/bin/env python3
"""Render the Ash palette swatch images used in the README (blog-style strips).

Usage: python3 tools/make_palette_images.py <repo-root>
Requires: ImageMagick (convert).
"""
import subprocess
import sys
from pathlib import Path

SW = 120          # swatch width
SH = 80           # swatch height
GAP = 14          # horizontal gap
COLS = 8
PAD = 24          # outer padding
LABEL_H = 40      # two text lines under a swatch
ROW_H = SH + LABEL_H

VARIANTS = {
    "light": {
        "bg": "#e9e3d5", "fg": "#2a2822", "stroke": "#c9c1ad",
        "rows": [
            [("paper", "#e9e3d5"), ("raised", "#f2ecdf"), ("deep", "#dcd5c3"),
             ("border", "#c9c1ad"), ("muted", "#6f685c"), ("icon", "#5b5449"),
             ("ink", "#2a2822"), ("ink dark", "#141310")],
            [("ember", "#a85f1d"), ("gold", "#8a6a24"), ("blood", "#96392a"),
             ("rot", "#7c4a66"), ("moss", "#5c6631"), ("steel", "#3d6b72"),
             ("violet", "#6a4c72"), ("rust", "#7d4a2c")],
        ],
    },
    "dark": {
        "bg": "#100f12", "fg": "#e6dfd1", "stroke": "#3a383d",
        "rows": [
            [("void", "#100f12"), ("panel", "#1c1b1f"), ("raised", "#29282c"),
             ("border", "#3a383d"), ("ash", "#6d6a63"), ("stone", "#999187"),
             ("bone", "#e6dfd1"), ("chalk", "#f3ede1")],
            [("ember", "#e0914f"), ("gold", "#d6b46a"), ("blood", "#c15c46"),
             ("rot", "#b47e99"), ("moss", "#8f9a5c"), ("steel", "#7c9aa1"),
             ("violet", "#a585ac"), ("rust", "#a86a48")],
        ],
    },
}


def render(variant, cfg, out):
    width = PAD * 2 + COLS * SW + (COLS - 1) * GAP
    height = PAD * 2 + len(cfg["rows"]) * ROW_H
    args = ["convert", "-size", f"{width}x{height}", f"xc:{cfg['bg']}",
            "-font", "DejaVu-Sans"]
    for r, row in enumerate(cfg["rows"]):
        for c, (name, color) in enumerate(row):
            x = PAD + c * (SW + GAP)
            y = PAD + r * ROW_H
            args += ["-fill", color, "-stroke", cfg["stroke"], "-strokewidth", "1",
                     "-draw", f"rectangle {x},{y} {x + SW},{y + SH}"]
            cx = x + SW // 2 - width // 2  # gravity North anchors at top-center
            args += ["-stroke", "none", "-fill", cfg["fg"],
                     "-pointsize", "14", "-gravity", "North",
                     "-annotate", f"+{cx}+{y + SH + 6}", name]
            args += ["-pointsize", "13", "-fill", cfg["fg"], "-stroke", "none",
                     "-gravity", "North",
                     "-annotate", f"+{cx}+{y + SH + 24}", color]
    args.append(str(out))
    subprocess.run(args, check=True)


def main():
    root = Path(sys.argv[1]).resolve()
    img_dir = root / "images"
    img_dir.mkdir(exist_ok=True)
    for variant, cfg in VARIANTS.items():
        out = img_dir / f"ash-{variant}-palette.png"
        render(variant, cfg, out)
        print(f"wrote {out.relative_to(root)}")


if __name__ == "__main__":
    main()