"""《回声地窟》cover.png 生成：1080x1920，深色洞窟底 + 声波脉冲/等高线意象 + 标题。

可复现脚本（random.seed 固定）。PIL 探测顺序：系统 python3 → .venv-tts/bin/python，
都没有则 uv pip install pillow --python .venv-tts/bin/python（阿里云镜像）。
"""
import math
import os
import random
import subprocess
import sys

W, H = 1080, 1920
OUT = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "cover.png")
FONT_CANDIDATES = [
    "/home/xsl/SoundGame/app/src/reflex/gen/NotoSansSC-Bold.ttf",
    "/usr/share/fonts/truetype/noto/NotoSansCJK-Bold.ttc",
    "/usr/share/fonts/opentype/noto/NotoSansCJK-Bold.ttc",
]


def find_font():
    for p in FONT_CANDIDATES:
        if os.path.exists(p):
            return p
    raise SystemExit("no CJK font found; add path to FONT_CANDIDATES")


def ensure_pil():
    try:
        import PIL  # noqa: F401
        return
    except ImportError:
        pass
    venv_py = "/home/xsl/SoundGame/.venv-tts/bin/python"
    if os.path.exists(venv_py):
        subprocess.run([venv_py, "-m", "pip", "install", "pillow",
                        "--index-url", "https://mirrors.aliyun.com/pypi/simple/"], check=True)
    else:
        subprocess.run([sys.executable, "-m", "pip", "install", "pillow",
                        "--index-url", "https://mirrors.aliyun.com/pypi/simple/"], check=True)


ensure_pil()
from PIL import Image, ImageChops, ImageDraw, ImageFilter, ImageFont  # noqa: E402

random.seed(42)

img = Image.new("RGB", (W, H))
px = img.load()
# 深色洞窟竖向渐变：上 #06070c -> 下 #14121c（近黑的岩壁，底部微暖）
top, bottom = (6, 7, 12), (20, 18, 28)
for y in range(H):
    t = y / (H - 1)
    for x in range(W):
        px[x, y] = tuple(int(a + (b - a) * t) for a, b in zip(top, bottom))

d = ImageDraw.Draw(img)

# 等高线意象：一组以画面中心偏下为圆心的不规则闭合环（洞窟剖面）
cx, cy = W * 0.5, H * 0.46
for ring in range(9):
    rr = 90 + ring * 78
    pts = []
    for i in range(72):
        ang = i / 72 * math.tau
        wob = 1 + 0.10 * math.sin(ang * 3 + ring) + 0.06 * math.cos(ang * 5 - ring * 2)
        pts.append((cx + math.cos(ang) * rr * wob, cy + math.sin(ang) * rr * wob * 0.82))
    shade = 26 + ring * 7
    d.line(pts + [pts[0]], fill=(shade, shade + 4, shade + 14), width=3)

# 声波脉冲：从洞窟中心向外的一圈圈脉冲环（越远越淡 = 回声衰减）
pulse = Image.new("RGB", (W, H), (0, 0, 0))
pd = ImageDraw.Draw(pulse)
for ring in range(5):
    rr = 60 + ring * 130
    alpha = 90 - ring * 16
    pd.ellipse([cx - rr, cy - rr * 0.82, cx + rr, cy + rr * 0.82],
               outline=(alpha, alpha + 30, alpha + 60), width=6)
pulse = pulse.filter(ImageFilter.GaussianBlur(7))
img = ImageChops.add(img, pulse)
d = ImageDraw.Draw(img)

# 玩家光点 + 两侧回声亮斑（左右声道预 pan 意象）
d.ellipse([cx - 10, cy - 10, cx + 10, cy + 10], fill=(235, 240, 255))
glow = Image.new("RGB", (W, H), (0, 0, 0))
gd = ImageDraw.Draw(glow)
gd.ellipse([cx - 320, cy - 40, cx - 180, cy + 60], fill=(70, 110, 170))   # 左声道
gd.ellipse([cx + 190, cy - 120, cx + 330, cy - 10], fill=(70, 110, 170))  # 右声道
gd.ellipse([cx - 60, cy - 300, cx + 60, cy - 180], fill=(60, 100, 160))   # 正前远墙
glow = glow.filter(ImageFilter.GaussianBlur(30))
img = ImageChops.add(img, glow)
d = ImageDraw.Draw(img)

FONT = find_font()


def text_center(y, s, size, fill, glow_color=None):
    f = ImageFont.truetype(FONT, size)
    bbox = d.textbbox((0, 0), s, font=f)
    x = (W - (bbox[2] - bbox[0])) / 2 - bbox[0]
    if glow_color:
        tg = Image.new("RGB", (W, H), (0, 0, 0))
        ImageDraw.Draw(tg).text((x, y), s, font=f, fill=glow_color)
        tg = tg.filter(ImageFilter.GaussianBlur(22))
        img.paste(ImageChops.add(img.crop((0, 0, W, H)), tg).crop((0, 0, W, H)), (0, 0))
        d.text((x, y), s, font=f, fill=fill)
    else:
        d.text((x, y), s, font=f, fill=fill)


title = "回 声 地 窟"
f = ImageFont.truetype(FONT, 210)
bbox = d.textbbox((0, 0), title, font=f)
tx = (W - (bbox[2] - bbox[0])) / 2 - bbox[0]
ty = 1210
tg = Image.new("RGB", (W, H), (0, 0, 0))
ImageDraw.Draw(tg).text((tx, ty), title, font=f, fill=(40, 90, 150))
tg = tg.filter(ImageFilter.GaussianBlur(20))
img = ImageChops.add(img, tg)
d = ImageDraw.Draw(img)
d.text((tx, ty), title, font=f, fill=(230, 240, 252))

text_center(1490, "ECHO CAVERN", 42, (96, 128, 176))
text_center(1600, "伸手不见五指，声音就是你的眼睛", 56, (206, 220, 244))
text_center(1700, "单击脉冲回声看路 · 按住前进 · 左右滑转身", 40, (128, 142, 170))
text_center(1770, "双击再听 · 上滑状态 · 下滑菜单", 40, (128, 142, 170))

img.save(OUT)
print("saved", os.path.abspath(OUT), img.size)