"use client";

import { useEffect, useState } from "react";
import { useTheme } from "next-themes";
import { THEMES } from "@/lib/themes";
import { useThemeId } from "@/lib/use-theme-id";
import { Check, Moon, Sun } from "lucide-react";
import { cn } from "@/lib/utils";

/**
 * ThemePicker — the only theme control in the app.
 *
 * One row: 4 base themes. Below: a single light/dark toggle. No custom
 * theme builder, no standout vs standard split — every theme is a
 * first-class base palette inspired by a real product surface.
 */
export function ThemePicker() {
  const { theme: mode, setTheme: setMode } = useTheme();
  const { themeId, setThemeId } = useThemeId();
  const [mounted, setMounted] = useState(false);

  useEffect(() => setMounted(true), []); // eslint-disable-line react-hooks/set-state-in-effect

  return (
    <div className="space-y-8">
      {/* Base themes */}
      <div className="space-y-3">
        <div className="text-xs font-semibold uppercase tracking-widest text-muted-foreground">
          Theme
        </div>
        <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
          {THEMES.map((t) => (
            <ThemeCard
              key={t.id}
              theme={t}
              active={mounted ? themeId === t.id : t.id === "wfdash"}
              onSelect={() => setThemeId(t.id)}
            />
          ))}
        </div>
      </div>

      {/* Light / dark toggle */}
      <div className="space-y-3">
        <div className="text-xs font-semibold uppercase tracking-widest text-muted-foreground">
          Mode
        </div>
        <div className="inline-grid max-w-sm grid-cols-2 gap-2">
          <button
            type="button"
            onClick={() => setMode("light")}
            className={cn(
              "flex items-center justify-center gap-2 rounded-lg border px-4 py-2.5 text-sm font-medium transition-colors",
              mode === "light"
                ? "border-primary bg-primary text-primary-foreground"
                : "border-border bg-card hover:bg-accent"
            )}
          >
            <Sun className="h-4 w-4" />
            Light
          </button>
          <button
            type="button"
            onClick={() => setMode("dark")}
            className={cn(
              "flex items-center justify-center gap-2 rounded-lg border px-4 py-2.5 text-sm font-medium transition-colors",
              mode === "dark"
                ? "border-primary bg-primary text-primary-foreground"
                : "border-border bg-card hover:bg-accent"
            )}
          >
            <Moon className="h-4 w-4" />
            Dark
          </button>
        </div>
      </div>
    </div>
  );
}

function ThemeCard({
  theme,
  active,
  onSelect,
}: {
  theme: (typeof THEMES)[number];
  active: boolean;
  onSelect: () => void;
}) {
  return (
    <button
      type="button"
      onClick={onSelect}
      className={cn(
        "group relative flex flex-col gap-2 rounded-xl border-2 bg-card p-3 text-left transition-all hover:shadow-md",
        active ? "border-primary shadow-sm" : "border-border hover:border-primary/40"
      )}
    >
      {/* Mini preview */}
      <div
        className="relative w-full overflow-hidden rounded-lg border border-border/60"
        style={{ background: theme.surface, aspectRatio: "16 / 9" }}
      >
        {/* Fake window chrome */}
        <div
          className="flex items-center gap-1 border-b px-2 py-1.5"
          style={{ borderColor: theme.surface === "#FFFFFF" ? "rgba(0,0,0,0.08)" : "rgba(255,255,255,0.10)" }}
        >
          <span className="h-1.5 w-1.5 rounded-full" style={{ background: "#FF5F57" }} />
          <span className="h-1.5 w-1.5 rounded-full" style={{ background: "#FEBC2E" }} />
          <span className="h-1.5 w-1.5 rounded-full" style={{ background: "#28C840" }} />
        </div>
        {/* Fake content */}
        <div className="grid grid-cols-3 gap-1.5 p-2">
          <div
            className="col-span-1 h-12 rounded"
            style={{ background: theme.accent, opacity: 0.92 }}
          />
          <div
            className="col-span-1 h-12 rounded"
            style={{ background: theme.ink, opacity: 0.10 }}
          />
          <div
            className="col-span-1 h-12 rounded"
            style={{ background: theme.accent, opacity: 0.4 }}
          />
          <div
            className="col-span-2 h-6 rounded"
            style={{ background: theme.ink, opacity: 0.14 }}
          />
          <div
            className="col-span-1 h-6 rounded"
            style={{ background: theme.accent, opacity: 0.7 }}
          />
          <div
            className="col-span-3 h-2 rounded"
            style={{ background: theme.ink, opacity: 0.18 }}
          />
          <div
            className="col-span-2 h-2 rounded"
            style={{ background: theme.ink, opacity: 0.10 }}
          />
        </div>
        {active && (
          <div className="absolute right-2 top-2 grid h-6 w-6 place-items-center rounded-full bg-primary text-primary-foreground shadow">
            <Check className="h-3.5 w-3.5" />
          </div>
        )}
        {/* Tri-color brand stripe — only the WFDASH card gets this. Sits
              at the bottom of the preview so the picker advertises the
              tri-color brand identity of the WFDASH theme. */}
        {theme.id === "wfdash" && (
          <div
            aria-hidden="true"
            className="absolute inset-x-0 bottom-0 h-1.5"
            style={{
              background:
                "linear-gradient(90deg, #377DCF 0% 28%, #ED8C31 50%, #E73631 72% 100%)",
            }}
          />
        )}
      </div>
      <div className="space-y-0.5">
        <div className="flex items-center gap-2">
          <div className="text-sm font-semibold">{theme.label}</div>
          <span className="rounded-full bg-muted px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-widest text-muted-foreground">
            {theme.reference}
          </span>
          {theme.id === "wfdash" && (
            <span
              className="rounded-full px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-widest text-white"
              style={{
                background:
                  "linear-gradient(90deg, #377DCF 0% 33%, #ED8C31 33% 66%, #E73631 66% 100%)",
              }}
            >
              Default
            </span>
          )}
        </div>
        <div className="text-xs leading-snug text-muted-foreground">{theme.tagline}</div>
      </div>
    </button>
  );
}