# -*- coding: utf-8 -*-
"""Фоны adaptive-иконки: градиент под акцент темы + радиальное свечение + тень от логотипа."""
from PIL import Image, ImageDraw, ImageFilter
import numpy as np, os

TH = r"C:\radiOLA\design\logos\gen\themed"
DRW = r"C:\radiOLA\app\src\main\res\drawable-nodpi"
PREV = os.environ["LOCALAPPDATA"] + r"\Temp\radiola_bg_preview.png"
S = 432
THEMES = [
    ("forest",  (0xA8,0xE0,0x5F), (0x0C,0x14,0x10)),
    ("ocean",   (0x4F,0xD6,0xE0), (0x0A,0x0F,0x1A)),
    ("sunset",  (0xFF,0x8A,0x5B), (0x1A,0x0F,0x0C)),
    ("amethyst",(0xB3,0x88,0xFF), (0x12,0x0E,0x1A)),
    ("neon",    (0xFF,0x4D,0x9D), (0x0D,0x0A,0x12)),
    ("amber",   (0xFF,0xC2,0x47), (0x14,0x11,0x0A)),
    ("ice",     (0x7F,0xB3,0xFF), (0x0C,0x10,0x14)),
    ("rose",    (0xFF,0x7E,0xA8), (0x16,0x0E,0x12)),
]

def lerp(a,b,t): return tuple(a[i]+(b[i]-a[i])*t for i in range(3))

yy,xx = np.mgrid[0:S,0:S]
cx,cy=S*0.5,S*0.46
rad = np.sqrt((xx-cx)**2+(yy-cy)**2)/(S*0.62)   # 0 в центре → ~1 к краю
diag = (xx+yy)/(2*S)                              # 0 верх-лево → 1 низ-право

def make_bg(accent, bg):
    acc=np.array(accent,float); base=np.array(bg,float)
    # 1) база: лёгкий диагональный градиент (верх чуть светлее с оттенком акцента, низ темнее)
    top = lerp(bg, accent, 0.10); top=np.array([min(255,c*1.15) for c in top])
    bot = np.array([c*0.7 for c in bg])
    g = diag[...,None]
    img = top*(1-g) + bot*g
    # 2) радиальное акцентное свечение в центре
    glow = np.clip(1-rad,0,1)**1.7
    img = img + (acc-img)*(glow[...,None]*0.30)
    # 3) виньетка по углам
    vig = np.clip(rad-0.6,0,1)
    img = img*(1-vig[...,None]*0.35)
    return Image.fromarray(np.clip(img,0,255).astype("uint8"),"RGB").convert("RGBA")

def r_shadow(theme):
    """Мягкая тень от логотипа (силуэт R), запечённая в фон."""
    logo=Image.open(os.path.join(TH,f"logo_{theme}.png")).convert("RGBA")
    logo=logo.crop(logo.getbbox())
    target=196; sc=target/max(logo.size)
    logo=logo.resize((int(logo.width*sc),int(logo.height*sc)))
    sh=Image.new("RGBA",(S,S),(0,0,0,0))
    # силуэт из альфы
    sil=Image.new("RGBA",(S,S),(0,0,0,0))
    a=logo.split()[3]
    blk=Image.new("RGBA",logo.size,(0,0,0,150))
    sil.paste(blk,((S-logo.width)//2+7,(S-logo.height)//2+14),a)   # сдвиг вниз-вправо
    sil=sil.filter(ImageFilter.GaussianBlur(16))
    return sil

cols=4; rows=2; pad=16
sheet=Image.new("RGB",(cols*S//2+(cols+1)*pad, rows*S//2+(rows+1)*pad),(28,28,32))
for i,(name,acc,bg) in enumerate(THEMES):
    base=make_bg(acc,bg)
    base.alpha_composite(r_shadow(name))
    base.convert("RGB").save(os.path.join(DRW,f"ic_bg_{name}.png"))
    # превью: фон + foreground + круглая маска
    fg=Image.open(os.path.join(DRW,f"ic_fg_{name}.png")).convert("RGBA")
    full=base.copy(); full.alpha_composite(fg)
    mask=Image.new("L",(S,S),0); ImageDraw.Draw(mask).ellipse([0,0,S,S],fill=255)
    out=Image.new("RGB",(S,S),(28,28,32)); out.paste(full.convert("RGB"),(0,0),mask)
    out=out.resize((S//2,S//2))
    r=i//cols; c=i%cols; x=pad+c*(S//2+pad); y=pad+r*(S//2+pad)
    sheet.paste(out,(x,y))
sheet.save(PREV)
print("bg generated + preview", PREV)