"""web/simon 封面：1080x1920，深色底 + 游戏名 + 玩法提示 + 手势图例。"""
import math
import os
import random

from PIL import Image, ImageDraw, ImageFilter, ImageFont

W, H = 1080, 1920
FONT = "/home/xsl/SoundGame/app/src/reflex/gen/NotoSansSC-Bold.ttf"
OUT = os.path.join(os.path.dirname(__file__), "..", "cover.png")

img = Image.new("RGB", (W, H), (10, 12, 26))
d = ImageDraw.Draw(img)

# 背景：竖向微渐变 + 随机声波弧线
for y in range(H):
    t = y / H
    d.line([(0, y), (W, y)], fill=(int(10 + 14 * t), int(12 + 10 * t), int(26 + 30 * t)))

wave = Image.new("RGBA", (W, H), (0, 0, 0, 0))
wd = ImageDraw.Draw(wave)
rng = random.Random(42)
colors = [(94, 234, 212), (129, 140, 248), (244, 114, 182), (250, 204, 21)]
for i in range(28):
    cx, cy = rng.randint(0, W), rng.randint(0, H)
    r = rng.randint(60, 320)
    c = colors[i % len(colors)]
    a = rng.randint(10, 36)
    wd.ellipse([cx - r, cy - r, cx + r, cy + r], outline=c + (a,), width=rng.randint(2, 5))
wave = wave.filter(ImageFilter.GaussianBlur(1.5))
img.paste(wave, (0, 0), wave)
d = ImageDraw.Draw(img)

# 中央：六边形"声波脉冲"标志
cx, cy = W // 2, 640
pulse_cols = [(94, 234, 212), (129, 140, 248), (244, 114, 182)]
for i, r in enumerate([120, 200, 280]):
    col = pulse_cols[i]
    alpha = 200 - i * 55
    ring = Image.new("RGBA", (W, H), (0, 0, 0, 0))
    rd = ImageDraw.Draw(ring)
    rd.ellipse([cx - r, cy - r, cx + r, cy + r], outline=col + (alpha,), width=10 - i * 2)
    img.paste(ring, (0, 0), ring)
d = ImageDraw.Draw(img)
d.ellipse([cx - 52, cy - 52, cx + 52, cy + 52], fill=(94, 234, 212))

# 标题
f_title = ImageFont.truetype(FONT, 190)
f_sub = ImageFont.truetype(FONT, 56)
f_small = ImageFont.truetype(FONT, 40)

def ctext(y, s, font, fill, spacing=0):
    bbox = d.textbbox((0, 0), s, font=font)
    w = bbox[2] - bbox[0]
    x = (W - w) / 2
    for ch in s:
        d.text((x, y), ch, font=font, fill=fill)
        bb = d.textbbox((0, 0), ch, font=font)
        x += (bb[2] - bb[0]) + spacing

ctext(980, "音序回响", f_title, (240, 244, 255), spacing=12)
ctext(1230, "听音辨序 · 复现手势", f_sub, (148, 163, 184))

# 手势图例（两行三列）
hints = ["↑ 上滑 上行琶音", "↓ 下滑 下行低音", "← 左滑 左侧声道",
         "→ 右滑 右侧声道", "· 单击 短促鼓点", "·· 双击 两声连响"]
hx, hy = [60, 370, 680], 1400
for i, s in enumerate(hints):
    col = i % 3
    row = i // 3
    d.text((hx[col], hy + row * 84), s, font=f_small, fill=(110, 130, 160))

ctext(1700, "从 2 个音开始，每轮 +1，看你能坚持几轮", f_small, (90, 105, 135))

img.save(OUT)
print(OUT, img.size)