import { useNavigate } from "react-router-dom";
import { useResults } from "../../../stores/useResults";
import { LucideArrowLeft } from "lucide-react";
import { CircularLevelProgress } from "../../../components/CircularLevelProgress";
import { useEffect, useState } from "react";
import { useExamConfigStore } from "../../../stores/useExamConfigStore";

// ─── Shared styles injected once ─────────────────────────────────────────────
const STYLES = `
  @import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;700;800;900&family=Nunito+Sans:wght@400;600&display=swap');

  :root { --content-max: 1100px; }

  .results-screen {
    min-height: 100vh;
    background: #fffbf4;
    font-family: 'Nunito', sans-serif;
    position: relative;
    overflow-x: hidden;
    padding: 0 0 3rem 0;
  }

  /* ── Blobs ── */
  .r-blob { position: fixed; pointer-events: none; z-index: 0; }
  .r-blob-1 {
    width: 260px; height: 260px; background: #fde68a;
    top: -80px; left: -80px;
    border-radius: 60% 40% 70% 30% / 50% 60% 40% 50%;
    animation: rWobble1 6s ease-in-out infinite;
  }
  .r-blob-2 {
    width: 200px; height: 200px; background: #a5f3c0;
    bottom: -60px; left: 8%;
    border-radius: 40% 60% 30% 70% / 60% 40% 60% 40%;
    animation: rWobble2 7s ease-in-out infinite;
  }
  .r-blob-3 {
    width: 220px; height: 220px; background: #fbcfe8;
    top: 12%; right: -60px;
    border-radius: 70% 30% 50% 50% / 40% 60% 40% 60%;
    animation: rWobble1 8s ease-in-out infinite reverse;
  }
  .r-blob-4 {
    width: 160px; height: 160px; background: #bfdbfe;
    bottom: 15%; right: 3%;
    border-radius: 50% 50% 30% 70% / 60% 40% 60% 40%;
    animation: rWobble2 5s ease-in-out infinite;
  }
  @keyframes rWobble1 {
    0%,100% { border-radius:60% 40% 70% 30%/50% 60% 40% 50%; transform:translate(0,0) rotate(0deg); }
    50%      { border-radius:40% 60% 30% 70%/60% 40% 60% 40%; transform:translate(12px,16px) rotate(8deg); }
  }
  @keyframes rWobble2 {
    0%,100% { border-radius:40% 60% 30% 70%/60% 40% 60% 40%; transform:translate(0,0) rotate(0deg); }
    50%      { border-radius:60% 40% 70% 30%/40% 60% 40% 60%; transform:translate(-10px,12px) rotate(-6deg); }
  }

  /* ── Floating dots ── */
  .r-dot {
    position: fixed; border-radius: 50%; pointer-events: none; z-index: 0;
    animation: rFloat 4s ease-in-out infinite;
  }
  @keyframes rFloat {
    0%,100% { transform: translateY(0) rotate(0deg); }
    50%      { transform: translateY(-14px) rotate(180deg); }
  }

  /* ── Content wrapper ── */
  .results-inner {
    position: relative; z-index: 1;
    max-width: 520px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 2rem;
    display: flex; flex-direction: column; gap: 1rem;
  }

  /* Desktop / wide layout */
  @media (min-width: 900px) {
    .results-inner { max-width: var(--content-max); padding: 3rem 1.5rem 4rem; }
    .stats-grid { grid-template-columns: repeat(4, 1fr); }

    .r-blob-1 { left: calc((100vw - var(--content-max)) / 2 - 120px); top: -120px; width: 300px; height: 300px; }
    .r-blob-2 { left: calc((100vw - var(--content-max)) / 2 + 20px); bottom: -80px; width: 220px; height: 220px; }
    .r-blob-3 { right: calc((100vw - var(--content-max)) / 2 - 40px); top: 10%; width: 260px; height: 260px; }
    .r-blob-4 { right: calc((100vw - var(--content-max)) / 2 + 10px); bottom: 6%; width: 180px; height: 180px; }
  }

  /* ── Header ── */
  .results-header {
    display: flex; align-items: center; gap: 1rem;
    margin-bottom: 0.25rem;
    animation: rPopIn 0.45s cubic-bezier(0.34,1.56,0.64,1) both;
  }
  .results-back-btn {
    display: flex; align-items: center; justify-content: center;
    width: 40px; height: 40px; border-radius: 50%;
    border: 2px solid #c084fc;
    background: linear-gradient(135deg, #c084fc, #a855f7);
    cursor: pointer; flex-shrink: 0;
    box-shadow: 0 4px 0 #7e22ce55;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
  }
  .results-back-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 0 #7e22ce55; }
  .results-back-btn:active { transform: translateY(2px); box-shadow: 0 2px 0 #7e22ce55; }
  .results-title {
    font-size: 2rem; font-weight: 900; color: #1e1b4b;
    letter-spacing: -0.02em;
  }

  /* ── Mode badge ── */
  .mode-badge {
    display: flex; align-items: center; gap: 0.6rem;
    background: white; border: 2.5px solid #e9d5ff;
    border-radius: 16px; padding: 0.75rem 1.1rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    animation: rPopIn 0.45s cubic-bezier(0.34,1.56,0.64,1) 0.05s both;
  }
  .mode-badge-text { font-size: 0.85rem; font-weight: 700; color: #7e22ce; }
  .mode-badge-sub { font-size: 0.78rem; font-weight: 600; color: #a78bfa; }

  /* ── Hero congratulations banner ── */
  .congrats-banner {
    background: white;
    border: 2.5px solid #f3f4f6;
    border-radius: 24px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 6px 20px rgba(0,0,0,0.05);
    animation: rPopIn 0.45s cubic-bezier(0.34,1.56,0.64,1) 0.1s both;
    display: flex; flex-direction: column; align-items: center; gap: 0.25rem;
  }
  .congrats-emoji {
    font-size: 3rem;
    animation: rBounce 2s ease-in-out infinite;
    display: block; margin-bottom: 0.25rem;
  }
  @keyframes rBounce {
    0%,100% { transform: translateY(0) rotate(-4deg); }
    50%      { transform: translateY(-10px) rotate(4deg); }
  }
  .congrats-title {
    font-size: 1.4rem; font-weight: 900; color: #1e1b4b;
  }
  .congrats-title span { color: #f97316; }
  .congrats-sub {
    font-family: 'Nunito Sans', sans-serif;
    font-size: 0.85rem; font-weight: 600; color: #9ca3af;
  }

  /* ── XP ring section ── */
  .xp-section {
    display: flex; justify-content: center;
    animation: rPopIn 0.45s cubic-bezier(0.34,1.56,0.64,1) 0.15s both;
  }

  /* ── Stat cards grid ── */
  .stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    animation: rPopIn 0.45s cubic-bezier(0.34,1.56,0.64,1) 0.2s both;
  }
  .stat-card {
    background: white;
    border: 2.5px solid #f3f4f6;
    border-radius: 20px;
    padding: 1.1rem 1rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    display: flex; flex-direction: column; gap: 0.2rem;
  }
  .stat-card-label {
    font-size: 0.65rem; font-weight: 700;
    letter-spacing: 0.12em; text-transform: uppercase;
    color: #9ca3af;
    display: flex; align-items: center; gap: 0.35rem;
  }
  .stat-card-value {
    font-size: 1.9rem; font-weight: 900; color: #1e1b4b;
    line-height: 1;
  }
  .stat-card-sub {
    font-family: 'Nunito Sans', sans-serif;
    font-size: 0.75rem; font-weight: 600; color: #d1d5db;
  }
  /* Accent colours per card */
  .stat-card.orange { border-color: #fed7aa; }
  .stat-card.orange .stat-card-value { color: #f97316; }
  .stat-card.green  { border-color: #bbf7d0; }
  .stat-card.green  .stat-card-value { color: #16a34a; }
  .stat-card.purple { border-color: #e9d5ff; }
  .stat-card.purple .stat-card-value { color: #9333ea; }
  .stat-card.blue   { border-color: #bfdbfe; }
  .stat-card.blue   .stat-card-value { color: #2563eb; }

  /* ── Improvement tip card ── */
  .tip-card {
    background: white;
    border: 2.5px solid #f3f4f6;
    border-radius: 20px;
    padding: 1.1rem 1.25rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    animation: rPopIn 0.45s cubic-bezier(0.34,1.56,0.64,1) 0.25s both;
  }
  .tip-card-header {
    display: flex; align-items: center; gap: 0.5rem;
    margin-bottom: 0.6rem;
  }
  .tip-card-title {
    font-size: 0.95rem; font-weight: 900; color: #1e1b4b;
  }
  .tip-chips {
    display: flex; flex-wrap: wrap; gap: 0.5rem;
  }
  .tip-chip {
    background: #fafafa; border: 2px solid #f3f4f6;
    border-radius: 100px; padding: 0.35rem 0.85rem;
    font-size: 0.75rem; font-weight: 700; color: #374151;
    display: flex; align-items: center; gap: 0.3rem;
  }

  /* ── Done button ── */
  .done-btn {
    width: 100%;
    background: #f97316;
    color: white; border: none;
    border-radius: 100px;
    padding: 1rem 2.5rem;
    font-family: 'Nunito', sans-serif;
    font-size: 1rem; font-weight: 800;
    cursor: pointer;
    box-shadow: 0 6px 0 #c2560e, 0 8px 20px rgba(249,115,22,0.25);
    transition: transform 0.1s ease, box-shadow 0.1s ease;
    animation: rPopIn 0.45s cubic-bezier(0.34,1.56,0.64,1) 0.35s both;
    letter-spacing: 0.01em;
  }
  .done-btn:hover  { transform: translateY(-2px); box-shadow: 0 8px 0 #c2560e, 0 12px 24px rgba(249,115,22,0.3); }
  .done-btn:active { transform: translateY(3px);  box-shadow: 0 3px 0 #c2560e, 0 4px 12px rgba(249,115,22,0.2); }

  @keyframes rPopIn {
    from { opacity:0; transform: scale(0.88) translateY(12px); }
    to   { opacity:1; transform: scale(1) translateY(0); }
  }
`;

// ─── Animated counter ─────────────────────────────────────────────────────────
function useCountUp(target: number, duration = 900) {
  const [val, setVal] = useState(0);
  useEffect(() => {
    if (!target) return;
    let start: number | null = null;
    const tick = (t: number) => {
      if (!start) start = t;
      const p = Math.min((t - start) / duration, 1);
      setVal(Math.floor(p * target));
      if (p < 1) requestAnimationFrame(tick);
    };
    requestAnimationFrame(tick);
  }, [target]);
  return val;
}

// ─── Floating dots config (shared) ───────────────────────────────────────────
const DOTS = [
  { size: 12, color: "#f97316", top: "18%", left: "12%", delay: "0s" },
  { size: 8, color: "#a855f7", top: "33%", left: "5%", delay: "1s" },
  { size: 10, color: "#22c55e", top: "62%", left: "15%", delay: "0.5s" },
  { size: 14, color: "#3b82f6", top: "22%", right: "10%", delay: "1.5s" },
  { size: 8, color: "#f43f5e", top: "52%", right: "6%", delay: "0.8s" },
  { size: 10, color: "#eab308", top: "72%", right: "18%", delay: "0.3s" },
];

// ─── Targeted results ─────────────────────────────────────────────────────────
const TARGETED_XP = 15;
const TARGETED_SCORE = 15;

const TargetedResults = ({ onFinish }: { onFinish: () => void }) => {
  const { userMetrics } = useExamConfigStore();
  const previousXP = userMetrics.xp ?? 0;
  const gainedXP = TARGETED_XP;
  const levelMinXP = Math.floor(previousXP / 100) * 100;
  const levelMaxXP = levelMinXP + 100;
  const currentLevel = Math.floor(previousXP / 100) + 1;
  const displayXP = useCountUp(gainedXP);

  return (
    <div className="results-screen">
      <style>{STYLES}</style>

      {/* Blobs */}
      <div className="r-blob r-blob-1" />
      <div className="r-blob r-blob-2" />
      <div className="r-blob r-blob-3" />
      <div className="r-blob r-blob-4" />

      {/* Dots */}
      {DOTS.map((d, i) => (
        <div
          key={i}
          className="r-dot"
          style={
            {
              width: d.size,
              height: d.size,
              background: d.color,
              top: d.top,
              left: d.left,
              right: d.right,
              animationDelay: d.delay,
              animationDuration: `${3.5 + i * 0.4}s`,
            } as React.CSSProperties
          }
        />
      ))}

      <div className="results-inner">
        {/* Header */}
        <header className="results-header">
          <button className="results-back-btn" onClick={onFinish}>
            <LucideArrowLeft size={18} color="white" />
          </button>
          <h1 className="results-title">Results</h1>
        </header>

        {/* Mode badge */}
        <div className="mode-badge">
          <span style={{ fontSize: "1.4rem" }}>🎯</span>
          <div>
            <p className="mode-badge-text">Targeted Mode Complete!</p>
            <p className="mode-badge-sub">
              You answered all questions correctly.
            </p>
          </div>
        </div>

        {/* Congrats banner */}
        <div className="congrats-banner">
          <span className="congrats-emoji">🏆</span>
          <p className="congrats-title">
            Nailed it, <span>champ!</span>
          </p>
          <p className="congrats-sub">Perfect run — every question down.</p>
        </div>

        {/* XP ring */}
        <div className="xp-section">
          <CircularLevelProgress
            previousXP={previousXP}
            gainedXP={gainedXP}
            levelMinXP={levelMinXP}
            levelMaxXP={levelMaxXP}
            level={currentLevel}
          />
        </div>

        {/* Stats grid */}
        <div className="stats-grid">
          <div className="stat-card orange">
            <span className="stat-card-label">⚡ XP Gained</span>
            <span className="stat-card-value">+{displayXP}</span>
            <span className="stat-card-sub">experience points</span>
          </div>
          <div className="stat-card green">
            <span className="stat-card-label">🎯 Score</span>
            <span className="stat-card-value">{TARGETED_SCORE}</span>
            <span className="stat-card-sub">total points</span>
          </div>
          <div className="stat-card purple">
            <span className="stat-card-label">✅ Accuracy</span>
            <span className="stat-card-value">100%</span>
            <span className="stat-card-sub">all correct</span>
          </div>
          <div className="stat-card blue">
            <span className="stat-card-label">🔥 Streak</span>
            <span className="stat-card-value">Perfect</span>
            <span className="stat-card-sub">no mistakes</span>
          </div>
        </div>

        {/* Tip card */}
        <div className="tip-card">
          <div className="tip-card-header">
            <span style={{ fontSize: "1.2rem" }}>🚀</span>
            <span className="tip-card-title">Keep the momentum going!</span>
          </div>
          <div className="tip-chips">
            <div className="tip-chip">📖 Review mistakes</div>
            <div className="tip-chip">⏱️ Try timed mode</div>
            <div className="tip-chip">🎯 Next topic</div>
          </div>
        </div>

        <button className="done-btn" onClick={onFinish}>
          Done ✓
        </button>
      </div>
    </div>
  );
};

// ─── Main Results ─────────────────────────────────────────────────────────────
export const Results = () => {
  const navigate = useNavigate();
  const results = useResults((s) => s.results);
  const clearResults = useResults((s) => s.clearResults);
  const { payload } = useExamConfigStore();
  const isTargeted = payload?.mode === "TARGETED";

  function handleFinishExam() {
    useExamConfigStore.getState().clearPayload();

    clearResults();
    navigate("/student/home");
  }

  if (isTargeted) return <TargetedResults onFinish={handleFinishExam} />;

  // ── Standard mode values ───────────────────────────────────────────────────
  const previousXP = results ? results.total_xp - results.xp_gained : 0;
  const accuracy =
    results && results.total_questions > 0
      ? Math.round((results.correct_count / results.total_questions) * 100)
      : 0;
  const displayXP = useCountUp(results?.xp_gained ?? 0);
  const displayScore = useCountUp(results?.score ?? 0);

  // Motivational headline based on accuracy
  const headline =
    accuracy >= 90
      ? { emoji: "🏆", text: "Absolutely crushing it!" }
      : accuracy >= 70
        ? { emoji: "🎉", text: "Solid work, keep going!" }
        : accuracy >= 50
          ? { emoji: "💪", text: "Good effort, room to grow!" }
          : { emoji: "📚", text: "Every attempt makes you better!" };

  return (
    <div className="results-screen">
      <style>{STYLES}</style>

      {/* Blobs */}
      <div className="r-blob r-blob-1" />
      <div className="r-blob r-blob-2" />
      <div className="r-blob r-blob-3" />
      <div className="r-blob r-blob-4" />

      {/* Dots */}
      {DOTS.map((d, i) => (
        <div
          key={i}
          className="r-dot"
          style={
            {
              width: d.size,
              height: d.size,
              background: d.color,
              top: d.top,
              left: d.left,
              right: d.right,
              animationDelay: d.delay,
              animationDuration: `${3.5 + i * 0.4}s`,
            } as React.CSSProperties
          }
        />
      ))}

      <div className="results-inner">
        {/* Header */}
        <header className="results-header">
          <button className="results-back-btn" onClick={handleFinishExam}>
            <LucideArrowLeft size={18} color="white" />
          </button>
          <h1 className="results-title">Results</h1>
        </header>

        {/* Congrats banner — dynamic */}
        <div className="congrats-banner">
          <span className="congrats-emoji">{headline.emoji}</span>
          <p className="congrats-title">
            {headline.text.split(" ").slice(0, -1).join(" ")}{" "}
            <span>{headline.text.split(" ").slice(-1)}</span>
          </p>
          <p className="congrats-sub">Here's how you performed today</p>
        </div>

        {/* XP ring */}
        <div className="xp-section">
          {results && (
            <CircularLevelProgress
              previousXP={previousXP}
              gainedXP={results.xp_gained}
              levelMinXP={results.current_level_start}
              levelMaxXP={results.next_level_threshold}
              level={results.current_level}
            />
          )}
        </div>

        {/* Stats grid */}
        <div className="stats-grid">
          <div className="stat-card orange">
            <span className="stat-card-label">⚡ XP Gained</span>
            <span className="stat-card-value">+{displayXP}</span>
            <span className="stat-card-sub">experience points</span>
          </div>
          <div className="stat-card green">
            <span className="stat-card-label">🎯 Score</span>
            <span className="stat-card-value">{displayScore}</span>
            <span className="stat-card-sub">total points</span>
          </div>
          <div className={`stat-card ${accuracy >= 70 ? "purple" : "blue"}`}>
            <span className="stat-card-label">✅ Accuracy</span>
            <span className="stat-card-value">{accuracy}%</span>
            <span className="stat-card-sub">
              {results?.correct_count ?? 0} of {results?.total_questions ?? 0}{" "}
              correct
            </span>
          </div>
          <div className="stat-card blue">
            <span className="stat-card-label">❌ Missed</span>
            <span className="stat-card-value">
              {results ? results.total_questions - results.correct_count : 0}
            </span>
            <span className="stat-card-sub">questions to review</span>
          </div>
        </div>

        {/* Tip card */}
        <div className="tip-card">
          <div className="tip-card-header">
            <span style={{ fontSize: "1.2rem" }}>💡</span>
            <span className="tip-card-title">How to improve faster</span>
          </div>
          <div className="tip-chips">
            <div className="tip-chip">📖 Review wrong answers</div>
            <div className="tip-chip">🔁 Retry missed questions</div>
            <div className="tip-chip">⏱️ Work on pacing</div>
            <div className="tip-chip">📈 Track your trends</div>
          </div>
        </div>

        <button className="done-btn" onClick={handleFinishExam}>
          Done ✓
        </button>
      </div>
    </div>
  );
};
