"use client";

import { motion, useReducedMotion } from "framer-motion";
import { createContext, useContext } from "react";

import { useI18n } from "@/lib/i18n";
import type { Activity } from "@/lib/schemas";
import { useIsPhone } from "@/lib/use-phone";
import { cn } from "@/lib/utils";
import { Button } from "@/components/ui";

export type ActivityComponentProps<A extends Activity = Activity> = {
  activity: A;
  /** True when this slide is the one currently filling the screen. */
  active: boolean;
  /** Language of the deck, so AI grading answers in the same language. */
  language?: string;
  /** Report the result to the feed (once per attempt). */
  onAnswered: (correct: boolean, meta?: { userAnswer?: string }) => void;
  /** Scroll the feed to the next slide. */
  onNext: () => void;
  isLast: boolean;
  /** Overrides the feedback button label (the homework guide uses this). */
  nextLabel?: string;
  /** Exam mode: hide hint rows and answer-reveal affordances. */
  noHints?: boolean;
};

export const TYPE_META: Record<Activity["type"], { labelKey: string; icon: string; tint: string }> = {
  flashcard: { labelKey: "type.flashcard", icon: "🃏", tint: "tint-sky" },
  multiple_choice: { labelKey: "type.multipleChoice", icon: "🔘", tint: "tint-lilac" },
  true_false: { labelKey: "type.trueFalse", icon: "⚖️", tint: "tint-mint" },
  fill_blank: { labelKey: "type.fillBlank", icon: "✏️", tint: "tint-peach" },
  matching: { labelKey: "type.matching", icon: "🧲", tint: "tint-sky" },
  ordering: { labelKey: "type.ordering", icon: "🔢", tint: "tint-lilac" },
  short_answer: { labelKey: "type.shortAnswer", icon: "💬", tint: "tint-rose" },
};
export function ActivityHeader({
  type,
  topic,
  extra,
}: {
  type: Activity["type"];
  topic?: string;
  extra?: React.ReactNode;
}) {
  const { t } = useI18n();
  const meta = TYPE_META[type];
  return (
    <div className="flex flex-wrap items-center gap-2">
      <span
        className={cn(
          "inline-flex items-center gap-1.5 rounded-full px-3 py-1 text-xs font-semibold ring-1 ring-white/50 backdrop-blur-sm",
          meta.tint,
        )}
      >
        <span aria-hidden>{meta.icon}</span>
        {t(meta.labelKey)}
      </span>
      {topic ? (
        <span className="glass-chip rounded-full px-3 py-1 text-xs font-medium text-frost-600 dark:text-frost-300">
          {topic}
        </span>
      ) : null}
      {extra}
    </div>
  );
}

export function PromptCard({
  children,
  className,
  style,
}: {
  children: React.ReactNode;
  className?: string;
  style?: React.CSSProperties;
}) {
  return (
    <div
      className={cn("card glass-solid rounded-[1.5rem] px-5 py-6 text-balance sm:px-6", className)}
      style={style}
    >
      {children}
    </div>
  );
}

export function QuestionText({ children, className }: { children: React.ReactNode; className?: string }) {
  return (
    <p className={cn("text-xl font-bold leading-snug text-frost-950 sm:text-2xl dark:text-frost-50", className)}>
      {children}
    </p>
  );
}

/** Standard tile used for answer options. */
export function OptionTile({
  children,
  state = "idle",
  disabled,
  onClick,
  className,
  shortcut,
}: {
  children: React.ReactNode;
  state?: "idle" | "selected" | "correct" | "wrong" | "dim";
  disabled?: boolean;
  onClick?: () => void;
  className?: string;
  shortcut?: string;
}) {
  const states: Record<string, string> = {
    idle: "border-white/60 bg-white/55 hover:bg-white/80 dark:border-white/12 dark:bg-white/[0.07] dark:hover:bg-white/[0.12]",
    selected: "border-accent-400 bg-accent-50/80 dark:bg-accent-500/20",
    correct:
      "border-emerald-300 bg-emerald-50/90 text-emerald-950 dark:border-emerald-400/50 dark:bg-emerald-400/15 dark:text-emerald-50",
    wrong: "border-rose-300 bg-rose-50/90 text-rose-950 dark:border-rose-400/50 dark:bg-rose-400/15 dark:text-rose-50",
    dim: "border-white/40 bg-white/35 text-frost-400 dark:border-white/10 dark:bg-white/[0.04] dark:text-frost-500",
  };
  return (
    <button
      type="button"
      onClick={onClick}
      disabled={disabled}
      className={cn(
        "flex w-full items-center gap-3 rounded-2xl border px-4 py-3.5 text-left text-[15px] font-medium backdrop-blur-xl transition-all duration-200 disabled:cursor-default",
        states[state],
        !disabled && "active:scale-[0.99]",
        className,
      )}
    >
      {shortcut ? (
        <span className="grid size-6 shrink-0 place-items-center rounded-lg bg-[var(--surface-sunken)] text-xs font-bold text-frost-600 dark:text-frost-300">
          {shortcut}
        </span>
      ) : null}
      <span className="flex-1">{children}</span>
    </button>
  );
}

export function FeedbackPanel({
  correct,
  explanation,
  xp,
  onNext,
  isLast,
  nextLabel,
  headline,
  detail,
  children,
}: {
  correct: boolean;
  explanation: string;
  xp?: number;
  onNext: () => void;
  isLast?: boolean;
  /** Overrides the default “Next” / “See results” label. */
  nextLabel?: string;
  headline?: string;
  detail?: React.ReactNode;
  children?: React.ReactNode;
}) {
  const { t } = useI18n();
  const isPhone = useIsPhone();
  const reduceMotion = useReducedMotion();
  return (
    <motion.div
      initial={{ opacity: 0, y: 18 }}
      animate={{ opacity: 1, y: 0 }}
      transition={{ type: "spring", stiffness: 380, damping: 32 }}
      className={cn(
        "rounded-3xl border p-4 shadow-lift backdrop-blur-xl",
        correct
          ? "border-emerald-200/80 bg-gradient-to-b from-emerald-50/95 to-emerald-100/70 dark:border-emerald-400/30 dark:from-emerald-500/15 dark:to-emerald-500/5"
          : "border-rose-200/80 bg-gradient-to-b from-rose-50/95 to-rose-100/70 dark:border-rose-400/30 dark:from-rose-500/15 dark:to-rose-500/5",
      )}
      role="status"
      aria-live="polite"
    >
      <div className="flex items-center justify-between gap-3">
        <p
          className={cn(
            "flex items-center gap-2 text-base font-extrabold",
            correct ? "text-emerald-900 dark:text-emerald-200" : "text-rose-900 dark:text-rose-200",
            /* Phones: a soft pulse on correct, a quick shake on wrong. */
            isPhone && !reduceMotion && (correct ? "animate-pop" : "animate-wiggle"),
          )}
        >
          <span aria-hidden>{correct ? "✅" : "💧"}</span>
          {headline ?? (correct ? t("activity.niceOne") : t("activity.notQuite"))}
        </p>
        {correct && xp ? (
          <motion.span
            initial={{ scale: 0.6, opacity: 0 }}
            animate={{ scale: 1, opacity: 1 }}
            className="rounded-full bg-emerald-500 px-3 py-1 text-sm font-extrabold text-white shadow"
          >
            +{xp} XP
          </motion.span>
        ) : null}
      </div>

      {detail ? <div className="mt-2 text-sm text-frost-700 dark:text-frost-200">{detail}</div> : null}

      <p className="mt-2 text-sm leading-relaxed text-frost-700 dark:text-frost-200">
        <span className="font-bold">{t("activity.why")} </span>
        {explanation}
      </p>

      {children}

      <div className="mt-4 flex items-center justify-end">
        <Button onClick={onNext} size="md" className="min-w-28">
          {nextLabel ?? (isLast ? t("activity.seeResults") : t("activity.next"))}
          <span aria-hidden>→</span>
        </Button>
      </div>
    </motion.div>
  );
}

/** Small hint row under a question, e.g. "Tap a term, then its definition". */
export function Hint({ children }: { children: React.ReactNode }) {
  const noHints = useNoHints();
  if (noHints) return null;
  // hint-line: Aero gives this its own glass chip (it sits on the wallpaper).
  return <p className="hint-line text-sm text-frost-600 dark:text-frost-300">{children}</p>;
}

/**
 * Exam mode sets this through ActivityRenderer's `noHints` prop so the
 * affordances that give the answer away disappear without touching every
 * activity component.
 */
const NoHintsContext = createContext(false);

export function NoHintsProvider({ value, children }: { value: boolean; children: React.ReactNode }) {
  return <NoHintsContext.Provider value={value}>{children}</NoHintsContext.Provider>;
}

export function useNoHints(): boolean {
  return useContext(NoHintsContext);
}