#!/usr/bin/env python3
"""生成品牌 PNG/ICO（Pillow），供 Chrome 快捷方式与 manifest 使用。"""
from __future__ import annotations

import os
import shutil

REPO = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
OUT = os.path.join(REPO, "brand", "icons")

BG = (12, 16, 25, 255)
PANEL = (20, 27, 45, 255)
CYAN = (34, 211, 238, 255)
GREEN = (52, 211, 153, 255)
RED = (248, 113, 113, 255)


def _lerp(c1: tuple[int, ...], c2: tuple[int, ...], t: float) -> tuple[int, int, int, int]:
    t = max(0.0, min(1.0, t))
    return tuple(int(c1[i] + (c2[i] - c1[i]) * t) for i in range(4))  # type: ignore


def _rounded_rect(draw, box, radius: int, fill) -> None:
    draw.rounded_rectangle(box, radius=radius, fill=fill)


def render_icon(size: int):
    from PIL import Image, ImageDraw

    img = Image.new("RGBA", (size, size), (0, 0, 0, 0))
    draw = ImageDraw.Draw(img)
    m = max(6, size // 12)
    r = max(8, size // 6)
    _rounded_rect(draw, (m, m, size - m, size - m), r, BG)
    inner = m + max(2, size // 28)
    _rounded_rect(draw, (inner, inner, size - inner, size - inner), max(6, r - 4), PANEL)

    # 渐变描边（四角采样）
    border = max(2, size // 42)
    for i in range(border):
        t0 = i / max(1, border - 1)
        for x in range(inner, size - inner):
            t = (x - inner) / max(1, size - 2 * inner)
            col = _lerp(CYAN, GREEN, (t + t0) * 0.5)
            draw.point((x, inner + i), fill=col)
            draw.point((x, size - inner - 1 - i), fill=col)
        for y in range(inner, size - inner):
            t = (y - inner) / max(1, size - 2 * inner)
            col = _lerp(CYAN, GREEN, (t + t0) * 0.5)
            draw.point((inner + i, y), fill=col)
            draw.point((size - inner - 1 - i, y), fill=col)

    def sx(v: float) -> int:
        return int(v * size / 512)

    def sy(v: float) -> int:
        return int(v * size / 512)

    # 趋势线
    pts = [(120, 320), (200, 248), (280, 272), (392, 168)]
    scaled = [(sx(x), sy(y)) for x, y in pts]
    draw.line(scaled, fill=CYAN, width=max(2, size // 26), joint="curve")
    ex, ey = scaled[-1]
    draw.ellipse(
        (ex - size // 28, ey - size // 28, ex + size // 28, ey + size // 28),
        fill=GREEN,
    )

    # 蜡烛
    def candle(cx, top, bottom, body_top, body_bottom, color):
        w = max(1, size // 64)
        bh = max(2, size // 32)
        draw.line((cx, top, cx, bottom), fill=color, width=w)
        draw.rounded_rectangle(
            (cx - bh, body_top, cx + bh, body_bottom),
            radius=max(1, bh // 3),
            fill=color,
        )

    candle(sx(182), sy(248), sy(340), sy(268), sy(332), RED)
    candle(sx(282), sy(200), sy(340), sy(220), sy(316), GREEN)

    return img


def main() -> None:
    from PIL import Image

    os.makedirs(OUT, exist_ok=True)
    shutil.copy2(os.path.join(REPO, "brand", "icon.svg"), os.path.join(OUT, "icon.svg"))

    sizes = [16, 32, 48, 180, 192, 512]
    images: dict[int, Image.Image] = {}
    for sz in sizes:
        im = render_icon(sz)
        images[sz] = im
        name = "apple-touch-icon.png" if sz == 180 else f"icon-{sz}.png"
        im.save(os.path.join(OUT, name), format="PNG", optimize=True)

    ico_sizes = [16, 32, 48]
    ico_imgs = [images[s] for s in ico_sizes]
    ico_imgs[0].save(
        os.path.join(OUT, "favicon.ico"),
        format="ICO",
        sizes=[(s, s) for s in ico_sizes],
        append_images=ico_imgs[1:],
    )
    print(f"DONE {OUT}")


if __name__ == "__main__":
    main()