/** What a run earned.
 *
 * The rule this screen exists to enforce: there is no losing screen. A bad run shows
 * fewer stars and a slower animal, and the primary button still says "Nochmal" with the
 * focus already on it. Nothing here ever says "failed", nothing is red, and the pearls
 * always go up - see `pearlsFor` in lib/grading.ts. */

import { useEffect, useRef } from "react";

import { creatureById } from "../lib/aquarium";
import type { CreatureId } from "../lib/aquarium";
import type { RunResult } from "../lib/grading";
import { STAR_THRESHOLDS, visibleAnimals, animalById, animalIndex, animalProgress } from "../lib/grading";
import type { AnimalId } from "../lib/grading";

interface Props {
  result: RunResult;
  /** Set when this run opened the next lesson. */
  unlockedTitle: string | null;
  /** Set when this run released a creature into the aquarium. */
  newCreature: CreatureId | null;
  isNewBest: boolean;
  /** The fastest animal earned on any lesson so far - decides how much of the ladder
   * may be revealed. */
  bestEver: AnimalId | null;
  onRetry: () => void;
  onContinue: () => void;
  /** Null at the end of the curriculum. */
  continueLabel: string | null;
}

export function ResultSheet({
  result,
  unlockedTitle,
  newCreature,
  isNewBest,
  bestEver,
  onRetry,
  onContinue,
  continueLabel,
}: Props) {
  const animal = animalById(result.animal);
  const ladder = visibleAnimals(result.animal, bestEver);
  const reached = animalIndex(result.animal);
  const retryButton = useRef<HTMLButtonElement>(null);

  // Enter repeats the run. Fewest keystrokes between "that was fun" and "again".
  useEffect(() => retryButton.current?.focus(), []);

  return (
    <div className="overlay backdrop-enter">
      <div
        className="sheet sheet-enter"
        style={{ padding: "30px 38px 28px", width: "min(520px, 100%)", textAlign: "center" }}
      >
        <div style={{ fontSize: 88, lineHeight: 1, animation: "tierEnter 520ms ease-out" }}>
          {animal.emoji}
        </div>
        <div style={{ fontSize: 30, fontWeight: 900, color: "var(--ink)", marginTop: 6 }}>
          {animal.name}
        </div>

        <div style={{ display: "flex", justifyContent: "center", gap: 8, margin: "14px 0 4px" }}>
          {[1, 2, 3].map((star) => (
            <span
              key={star}
              style={{
                fontSize: 40,
                animation: `sterneEnter 320ms ease-out ${140 + star * 130}ms both`,
                filter: result.stars >= star ? "none" : "grayscale(1)",
                opacity: result.stars >= star ? 1 : 0.25,
              }}
            >
              ⭐
            </span>
          ))}
        </div>

        <div style={{ display: "flex", justifyContent: "center", gap: 26, marginTop: 12 }}>
          <Stat label="Richtig" value={`${Math.round(result.accuracy * 100)}%`} />
          <Stat label="Zeichen/Min" value={String(Math.round(result.speed))} />
          <Stat label="Perlen" value={`+${result.pearls}`} />
        </div>

        {/* How close the next animal is. A near miss is the strongest reason to press
            Nochmal, so it is worth showing explicitly. */}
        <div
          style={{
            height: 9,
            borderRadius: 999,
            background: "oklch(88% 0.02 175)",
            margin: "18px 0 6px",
            overflow: "hidden",
          }}
        >
          <div
            style={{
              width: `${animalProgress(result.points) * 100}%`,
              height: "100%",
              background: "var(--accent)",
              transition: "width 700ms ease-out",
            }}
          />
        </div>

        <AnimalLadder animals={ladder.animals} reached={reached} moreHidden={ladder.moreHidden} />

        {isNewBest && (
          <div style={{ color: "var(--accent)", fontWeight: 900, marginTop: 8 }}>
            🏅 Neuer Bestwert!
          </div>
        )}
        {unlockedTitle && (
          <div style={{ color: "var(--ink)", fontWeight: 900, marginTop: 8 }}>
            🔓 Neu: {unlockedTitle}
          </div>
        )}
        {newCreature && (
          <div
            style={{
              display: "flex",
              alignItems: "center",
              justifyContent: "center",
              gap: 10,
              color: "var(--ink)",
              fontWeight: 900,
              marginTop: 8,
            }}
          >
            <img
              src={creatureById(newCreature).image}
              alt=""
              style={{ width: 52, height: 52, objectFit: "contain", animation: "tierEnter 520ms ease-out" }}
            />
            {creatureById(newCreature).article} {creatureById(newCreature).name} ist ins Aquarium gezogen!
          </div>
        )}
        {!result.passed && !unlockedTitle && (
          <div style={{ color: "var(--ink)", opacity: 0.75, fontWeight: 700, marginTop: 10 }}>
            Mit {Math.round(STAR_THRESHOLDS.two * 100)}% Treffern geht es weiter. Fast!
          </div>
        )}

        <div style={{ display: "flex", gap: 12, marginTop: 22, justifyContent: "center" }}>
          <button
            ref={retryButton}
            onClick={onRetry}
            style={{
              ...buttonStyle,
              background: "var(--accent)",
              color: "var(--paper)",
            }}
          >
            Nochmal ⏎
          </button>
          {continueLabel && (
            <button onClick={onContinue} style={{ ...buttonStyle, background: "oklch(90% 0.02 175)", color: "var(--ink)" }}>
              {continueLabel}
            </button>
          )}
        </div>
      </div>
    </div>
  );
}

/** The animal ladder.
 *
 * Everything she has already passed stays in full colour - the run is a climb, and the
 * rungs below are what shows how far she has come. The rungs above are greyed out but
 * still legible, because the next animal has to be visible to be worth aiming at.
 *
 * Above the dolphin the ladder stops: those animals are not shown at all until they are
 * reached. A single "?" says the ladder continues without saying what is on it, which
 * keeps the top end a surprise rather than a distant, discouraging number. */
function AnimalLadder({
  animals,
  reached,
  moreHidden,
}: {
  animals: readonly { id: string; name: string; emoji: string }[];
  reached: number;
  moreHidden: boolean;
}) {
  return (
    <div
      style={{
        display: "flex",
        justifyContent: "center",
        alignItems: "flex-end",
        gap: 4,
        flexWrap: "wrap",
        marginTop: 14,
        minHeight: 44,
      }}
      aria-label="Tier-Leiter"
    >
      {animals.map((entry, i) => {
        const achieved = i <= reached;
        const isCurrent = i === reached;
        return (
          <div
            key={entry.id}
            title={entry.name}
            style={{
              fontSize: isCurrent ? 40 : 26,
              lineHeight: 1,
              padding: isCurrent ? "0 5px" : 0,
              filter: achieved ? "none" : "grayscale(1)",
              // Bright enough to read as "this is next", dim enough to read as "not yet".
              opacity: achieved ? 1 : 0.42,
              transform: isCurrent ? "translateY(-3px)" : undefined,
              transition: "all 200ms ease",
            }}
          >
            {entry.emoji}
          </div>
        );
      })}
      {moreHidden && (
        <div
          title="Da geht noch was!"
          style={{ fontSize: 24, opacity: 0.4, marginLeft: 4, filter: "grayscale(1)" }}
        >
          ❓
        </div>
      )}
    </div>
  );
}

const buttonStyle: React.CSSProperties = {
  border: "none",
  borderRadius: 999,
  padding: "13px 26px",
  fontSize: 17,
  fontWeight: 900,
  cursor: "pointer",
};

function Stat({ label, value }: { label: string; value: string }) {
  return (
    <div>
      <div style={{ fontSize: 25, fontWeight: 900, color: "var(--ink)" }}>{value}</div>
      <div style={{ fontSize: 12, fontWeight: 800, color: "var(--ink)", opacity: 0.6 }}>{label}</div>
    </div>
  );
}