import { useTheme } from "next-themes";
import { LiquidGlass, type LiquidGlassProps } from "simple-liquid-glass";
import { useTouchInput } from "~/lib/input-modality.ts";
import { cn } from "~/lib/utils.ts";

/**
 * 液态玻璃面:simple-liquid-glass 的薄封装,材质按 meniscus 的尺寸分档。
 * - lens:小控件(图标键、头像),几乎不糊,只在边带折射;
 * - regular:栏(顶栏胶囊、播放器底栏);
 * - frost:大块、字多的悬浮层(菜单)。只有真模糊,不做折射(见下方 effectMode)。
 * 折射只有 Chromium 桌面有(SVG 位移进 backdrop-filter);Safari / Firefox / 触屏设备走包自带的磨砂。
 * 只放在压着图片、视频、海报的层上;背后没细节的内容卡继续用 pg-slab。
 */
export type LiquidTier = "lens" | "regular" | "frost";

const TIERS: Record<
  LiquidTier,
  {
    blur: number;
    displacement: number;
    fill: { dark: string; light: string };
  }
> = {
  lens: { blur: 1, displacement: 6, fill: { dark: "rgba(0,0,0,0.14)", light: "rgba(255,255,255,0.08)" } },
  regular: { blur: 5, displacement: 10, fill: { dark: "rgba(10,11,14,0.30)", light: "rgba(255,255,255,0.16)" } },
  frost: { blur: 20, displacement: 8, fill: { dark: "rgba(14,15,19,0.58)", light: "rgba(255,255,255,0.5)" } },
};

const FROST_BLUR = "blur(24px) saturate(160%)";
// 模糊之上再压一层底色,浅色字(次要说明、退出登录)压在暖色画面上也读得清
const FROST_FILL = { dark: "rgba(14,15,19,0.55)", light: "rgba(255,255,255,0.6)" };

interface Props extends Omit<LiquidGlassProps, "radius"> {
  tier?: LiquidTier;
  radius: number;
  /** 播放器等恒暗区域固定用夜间参数 */
  forceDark?: boolean;
  /** 不画包自带的边光(主按钮的棱镜高光就是它的边光) */
  rimless?: boolean;
  /** 折射边缘带色散:背后画面在棱边被拆成彩色(只在 Chromium 桌面、背后有画面时看得到) */
  dispersive?: boolean;
  /** 只要玻璃外观与模糊,不做折射(测速页:实时曲线在重绘,不加 SVG 滤镜开销) */
  noRefraction?: boolean;
}

export function LiquidSurface({
  tier = "regular",
  radius,
  forceDark,
  rimless,
  dispersive,
  noRefraction,
  className,
  style,
  children,
  ...rest
}: Props) {
  const { resolvedTheme } = useTheme();
  const dark = forceDark || resolvedTheme !== "light";
  // 触屏设备(手机、平板、车机)不跑 SVG 折射,退回同参数的磨砂:车机这类 Linux 触屏会被包当成桌面
  const touch = useTouchInput();
  // 不折射、只模糊的情况:包在这个模式下不铺 glassColor,还会在顶部画一道 50% 白的光泽(夜间压住第一行字),
  // 底色由这里铺,光泽在 app.css 里按档收淡 / 去掉
  const blurOnly = touch || noRefraction || tier === "frost";
  const t = TIERS[tier];
  return (
    <LiquidGlass
      mode="custom"
      refraction="lens"
      lensProfile="material"
      quality={dispersive ? "high" : "standard"}
      radius={radius}
      blur={t.blur}
      displacementScale={dispersive ? t.displacement + 4 : t.displacement}
      saturation={150}
      dispersion={50}
      aberrationIntensity={dispersive ? 0.4 : 0.06}
      frost={0}
      // frost 档(字多的悬浮层)不做折射:Chromium 里同一个 backdrop-filter 同时有 blur 和 SVG 位移时,
      // 模糊不生效,菜单底下的画面原样透出来、字看不清。frost 只要真模糊,折射留给栏和按钮
      effectMode={blurOnly ? "blur" : "auto"}
      glassColor={dark ? t.fill.dark : t.fill.light}
      borderColor={rimless ? "rgba(255,255,255,0)" : dark ? "rgba(255,255,255,0.22)" : "rgba(255,255,255,0.65)"}
      className={cn("liquid-surface", `liquid-surface-${tier}`, blurOnly && "liquid-surface-blur", className)}
      style={{
        // frost 档(菜单、搜索结果等字多的悬浮层)自己垫一层固定模糊:包退回磨砂时只给 8~11px,
        // 菜单压在画面上看不清,这里统一保证 24px
        ...(tier === "frost"
          ? {
              backdropFilter: FROST_BLUR,
              WebkitBackdropFilter: FROST_BLUR,
              backgroundColor: dark ? FROST_FILL.dark : FROST_FILL.light,
            }
          : blurOnly
            ? { backgroundColor: dark ? t.fill.dark : t.fill.light }
            : null),
        // 1px 暗边线在亮棱外侧,投影只留贴边一层
        boxShadow: dark
          ? "0 0 0 1px rgba(0,0,0,0.28), 0 8px 24px -14px rgba(0,0,0,0.5)"
          : "0 0 0 1px rgba(20,22,28,0.08), 0 8px 24px -16px rgba(20,22,28,0.22)",
        ...style,
      }}
      {...rest}
    >
      {children}
    </LiquidGlass>
  );
}

/**
 * 给压在大图上的按钮加真折射:外面套一层 lens 玻璃,按钮本身挂 .btn-liquid 去掉自己的底和模糊,
 * 只留字、图标和主按钮的彩虹环。radius 取按钮高度的一半。
 */
export function LiquidLens({
  radius,
  primary,
  className,
  children,
}: {
  radius: number;
  primary?: boolean;
  className?: string;
  children: React.ReactNode;
}) {
  return (
    <LiquidSurface
      tier="lens"
      radius={radius}
      rimless={primary}
      dispersive={primary}
      className={className}
      style={{ width: "auto", height: "auto" }}
    >
      {children}
    </LiquidSurface>
  );
}