import {
  DecimalsArrowRight,
  Languages,
  Percent,
  Pilcrow,
  Superscript,
  WholeWord,
  Trophy,
} from "lucide-react";
import { useState } from "react";
import { useAuthStore } from "../../../stores/authStore";
import { useNavigate } from "react-router-dom";
import { useExamConfigStore } from "../../../stores/useExamConfigStore";

type Module = "EBRW" | "MATH" | null;

const DOTS = [
  { size: 10, color: "#f97316", top: "6%", left: "4%", delay: "0s" },
  { size: 7, color: "#a855f7", top: "28%", left: "2%", delay: "1.2s" },
  { size: 9, color: "#22c55e", top: "62%", left: "3%", delay: "0.6s" },
  { size: 12, color: "#3b82f6", top: "10%", right: "4%", delay: "1.8s" },
  { size: 7, color: "#f43f5e", top: "48%", right: "2%", delay: "0.9s" },
  { size: 9, color: "#eab308", top: "76%", right: "5%", delay: "0.4s" },
];

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

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

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

  .htm-blob { position:fixed;pointer-events:none;z-index:0;filter:blur(48px);opacity:0.35; }
  .htm-blob-1 { width:240px;height:240px;background:#fde68a;top:-80px;left:-80px;border-radius:60% 40% 70% 30%/50% 60% 40% 50%;animation:htmWobble1 14s ease-in-out infinite; }
  .htm-blob-2 { width:190px;height:190px;background:#a5f3c0;bottom:-50px;left:6%;border-radius:40% 60% 30% 70%/60% 40% 60% 40%;animation:htmWobble2 16s ease-in-out infinite; }
  .htm-blob-3 { width:210px;height:210px;background:#fbcfe8;top:15%;right:-60px;border-radius:70% 30% 50% 50%/40% 60% 40% 60%;animation:htmWobble1 18s ease-in-out infinite reverse; }
  .htm-blob-4 { width:150px;height:150px;background:#bfdbfe;bottom:12%;right:2%;border-radius:50% 50% 30% 70%/60% 40% 60% 40%;animation:htmWobble2 12s ease-in-out infinite; }

  @keyframes htmWobble1 {
    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 htmWobble2 {
    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);}
  }

  .htm-dot { position:fixed;border-radius:50%;pointer-events:none;z-index:0;opacity:0.3;animation:htmFloat 7s ease-in-out infinite; }
  @keyframes htmFloat {
    0%,100%{transform:translateY(0) rotate(0deg);}
    50%{transform:translateY(-12px) rotate(180deg);}
  }

  .htm-inner {
    position: relative; z-index: 1;
    max-width: 560px; margin: 0 auto;
    padding: 2rem 1.25rem 8rem;
    display: flex; flex-direction: column; gap: 1.5rem;
  }

  @keyframes htmPopIn {
    from { opacity:0; transform:scale(0.92) translateY(12px); }
    to   { opacity:1; transform:scale(1) translateY(0); }
  }
  .htm-anim   { animation: htmPopIn 0.4s cubic-bezier(0.34,1.56,0.64,1) both; }
  .htm-anim-1 { animation-delay: 0.05s; }
  .htm-anim-2 { animation-delay: 0.12s; }
  .htm-anim-3 { animation-delay: 0.19s; }

  /* Header */
  .htm-eyebrow {
    font-size: 0.62rem; font-weight: 800; letter-spacing: 0.16em;
    text-transform: uppercase; color: #84cc16;
    display: flex; align-items: center; gap: 0.35rem;
  }
  .htm-title {
    font-size: 1.75rem; font-weight: 900; color: #1e1b4b;
    letter-spacing: -0.02em; line-height: 1.15;
  }
  .htm-sub {
    font-family: 'Nunito Sans', sans-serif;
    font-size: 0.82rem; font-weight: 600; color: #9ca3af; line-height: 1.5;
    margin-top: 0.2rem;
  }

  /* Module cards */
  .htm-card {
    border-radius: 28px;
    position: relative; overflow: hidden;
    cursor: pointer;
    border: 3px solid transparent;
    transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1),
                box-shadow 0.2s ease,
                border-color 0.2s ease;
    min-height: 200px;
    display: flex; flex-direction: column; justify-content: flex-end;
  }
  .htm-card:hover   { transform: translateY(-4px); }
  .htm-card:active  { transform: translateY(2px) scale(0.98); }

  .htm-card.ebrw {
    background: linear-gradient(145deg, #3b82f6 0%, #1d4ed8 60%, #1e40af 100%);
    box-shadow: 0 10px 0 #1e3a8a66, 0 14px 32px rgba(29,78,216,0.3);
  }
  .htm-card.ebrw.selected {
    border-color: #93c5fd;
    box-shadow: 0 10px 0 #1e3a8a88, 0 16px 40px rgba(29,78,216,0.45);
    transform: translateY(-4px) scale(1.01);
  }

  .htm-card.math {
    background: linear-gradient(145deg, #f43f5e 0%, #e11d48 60%, #be123c 100%);
    box-shadow: 0 10px 0 #9f123666, 0 14px 32px rgba(225,29,72,0.3);
  }
  .htm-card.math.selected {
    border-color: #fda4af;
    box-shadow: 0 10px 0 #9f123688, 0 16px 40px rgba(225,29,72,0.45);
    transform: translateY(-4px) scale(1.01);
  }

  /* Decorative icons */
  .htm-card-icons {
    position: absolute; inset: 0; pointer-events: none;
  }

  /* Card body (text + chips) */
  .htm-card-body {
    position: relative; z-index: 2;
    padding: 1.5rem 1.5rem 1.75rem;
    display: flex; flex-direction: column; gap: 0.5rem;
  }

  .htm-card-tag {
    font-size: 0.6rem; font-weight: 800; letter-spacing: 0.18em;
    text-transform: uppercase; color: rgba(255,255,255,0.6);
  }
  .htm-card-name {
    font-size: 1.6rem; font-weight: 900; color: white;
    letter-spacing: -0.02em; line-height: 1.1;
  }
  .htm-card-desc {
    font-family: 'Nunito Sans', sans-serif;
    font-size: 0.78rem; font-weight: 600; color: rgba(255,255,255,0.7);
    line-height: 1.4; margin-top: 0.1rem;
  }

  /* Stat pills row */
  .htm-stat-row {
    display: flex; gap: 0.4rem; margin-top: 0.5rem; flex-wrap: wrap;
  }
  .htm-stat-pill {
    background: rgba(255,255,255,0.15);
    border: 1.5px solid rgba(255,255,255,0.25);
    border-radius: 100px; padding: 0.25rem 0.65rem;
    font-size: 0.65rem; font-weight: 800; color: white;
    display: flex; align-items: center; gap: 0.3rem;
    backdrop-filter: blur(4px);
  }

  /* Selected check badge */
  .htm-check-badge {
    position: absolute; top: 1rem; right: 1rem; z-index: 3;
    width: 32px; height: 32px; border-radius: 50%;
    background: rgba(255,255,255,0.2);
    border: 2px solid rgba(255,255,255,0.4);
    display: flex; align-items: center; justify-content: center;
    transition: all 0.25s cubic-bezier(0.34,1.56,0.64,1);
    opacity: 0; transform: scale(0.7);
  }
  .htm-card.selected .htm-check-badge {
    opacity: 1; transform: scale(1);
    background: rgba(255,255,255,0.3);
    border-color: rgba(255,255,255,0.7);
  }

  /* CTA bar */
  .htm-cta-bar {
    position: fixed;
    bottom: 96px;
    left: 0;
    right: 0;
    z-index: 10;
    padding: 0.85rem 1.25rem calc(0.85rem + env(safe-area-inset-bottom));
    transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), opacity 0.25s ease;
  }
  .htm-cta-bar.hidden {
    transform: translateY(100%); opacity: 0; pointer-events: none;
  }
  .htm-cta-inner {
    max-width: 560px;
    margin: 0 auto;
  }

  @media (min-width: 900px) {
    .htm-inner { max-width: var(--content-max); padding: 3rem 1.5rem 10rem; }
    .htm-cta-bar { left: var(--sidebar-width); right: 0; }
    .htm-cta-inner { max-width: var(--content-max); margin: 0 auto; }

    /* align blobs to centered content */
    .htm-blob-3 { right: calc((100vw - var(--content-max)) / 2 - 48px); }
    .htm-blob-1 { left: calc((100vw - var(--content-max)) / 2 - 56px); }
    .htm-blob-2 { left: calc((100vw - var(--content-max)) / 2 + 12px); }
    .htm-blob-4 { right: calc((100vw - var(--content-max)) / 2 + 12px); }

    /* make module cards slightly wider on desktop */
    .htm-card { min-height: 220px; }
  }

  .htm-start-btn {
    width: 100%; padding: 0.95rem;
    background: linear-gradient(135deg, #84cc16, #65a30d);
    color: white; border: none; border-radius: 100px; cursor: pointer;
    font-family: 'Nunito', sans-serif; font-size: 0.95rem; font-weight: 900;
    display: flex; align-items: center; justify-content: center; gap: 0.5rem;
    box-shadow: 0 6px 0 #3f6212, 0 8px 20px rgba(101,163,13,0.3);
    transition: transform 0.1s ease, box-shadow 0.1s ease;
  }
  .htm-start-btn:hover  { transform:translateY(-2px); box-shadow:0 8px 0 #3f6212,0 12px 24px rgba(101,163,13,0.35); }
  .htm-start-btn:active { transform:translateY(3px);  box-shadow:0 3px 0 #3f6212; }

  .htm-start-label {
    font-size: 0.7rem; font-weight: 700; color: #9ca3af;
    text-align: center; margin-top: 0.5rem;
    font-family: 'Nunito Sans', sans-serif;
  }
  .htm-start-label span { font-weight: 800; color: #6b7280; }
`;

export const HardTestModules = () => {
  const user = useAuthStore((state) => state.user);
  const navigate = useNavigate();
  const [selected, setSelected] = useState<Module>(null);
  const { setMode, storeDuration, setSection } = useExamConfigStore();

  function handleStartModule() {
    if (!user || !selected) return;
    setMode("MODULE");
    storeDuration(7);
    setSection(selected);
    navigate(`/student/practice/${selected}/test`, { replace: true });
  }

  const toggle = (mod: "EBRW" | "MATH") =>
    setSelected((prev) => (prev === mod ? null : mod));

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

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

      {/* Dots */}
      {DOTS.map((d, i) => (
        <div
          key={i}
          className="htm-dot"
          style={
            {
              width: d.size,
              height: d.size,
              background: d.color,
              top: d.top,
              left: d.left,
              right: d.right,
              animationDelay: d.delay,
              animationDuration: `${5 + i * 0.5}s`,
            } as React.CSSProperties
          }
        />
      ))}

      <div className="htm-inner">
        {/* Header */}
        <header className="htm-anim">
          <p className="htm-eyebrow">
            <Trophy size={11} /> Hard Modules
          </p>
          <h1 className="htm-title">Pick your challenge</h1>
          <p className="htm-sub">
            Tackle the hardest SAT questions. Select a section to begin.
          </p>
        </header>

        {/* EBRW Card */}
        <div
          className={`htm-card ebrw htm-anim htm-anim-1${selected === "EBRW" ? " selected" : ""}`}
          onClick={() => toggle("EBRW")}
        >
          {/* Background icons */}
          <div className="htm-card-icons">
            <Languages
              size={220}
              style={{
                position: "absolute",
                top: -20,
                right: -30,
                transform: "rotate(-20deg)",
                color: "white",
                opacity: 0.12,
              }}
            />
            <WholeWord
              size={130}
              style={{
                position: "absolute",
                top: -15,
                left: -10,
                transform: "rotate(15deg)",
                color: "white",
                opacity: 0.1,
              }}
            />
            <Pilcrow
              size={110}
              style={{
                position: "absolute",
                bottom: -20,
                left: 20,
                transform: "rotate(-18deg)",
                color: "white",
                opacity: 0.1,
              }}
            />
          </div>

          {/* Check */}
          <div className="htm-check-badge">
            <svg width="14" height="14" viewBox="0 0 14 14" fill="none">
              <path
                d="M2.5 7L5.5 10L11.5 4"
                stroke="white"
                strokeWidth="2.2"
                strokeLinecap="round"
                strokeLinejoin="round"
              />
            </svg>
          </div>

          {/* Body */}
          <div className="htm-card-body">
            <span className="htm-card-tag">Section 1</span>
            <h2 className="htm-card-name">
              Reading &amp;
              <br />
              Writing
            </h2>
            <p className="htm-card-desc">
              Grammar, vocabulary, comprehension &amp; evidence-based analysis
            </p>
            <div className="htm-stat-row">
              <span className="htm-stat-pill">📖 27 Questions</span>
              <span className="htm-stat-pill">⏱️ 32 min</span>
              <span className="htm-stat-pill">🔥 Hard tier</span>
            </div>
          </div>
        </div>

        {/* MATH Card */}
        <div
          className={`htm-card math htm-anim htm-anim-2${selected === "MATH" ? " selected" : ""}`}
          onClick={() => toggle("MATH")}
        >
          {/* Background icons */}
          <div className="htm-card-icons">
            <DecimalsArrowRight
              size={220}
              style={{
                position: "absolute",
                top: -20,
                right: -30,
                transform: "rotate(-20deg)",
                color: "white",
                opacity: 0.12,
              }}
            />
            <Superscript
              size={130}
              style={{
                position: "absolute",
                top: -15,
                left: -10,
                transform: "rotate(15deg)",
                color: "white",
                opacity: 0.1,
              }}
            />
            <Percent
              size={110}
              style={{
                position: "absolute",
                bottom: -15,
                left: 20,
                transform: "rotate(-10deg)",
                color: "white",
                opacity: 0.1,
              }}
            />
          </div>

          {/* Check */}
          <div className="htm-check-badge">
            <svg width="14" height="14" viewBox="0 0 14 14" fill="none">
              <path
                d="M2.5 7L5.5 10L11.5 4"
                stroke="white"
                strokeWidth="2.2"
                strokeLinecap="round"
                strokeLinejoin="round"
              />
            </svg>
          </div>

          {/* Body */}
          <div className="htm-card-body">
            <span className="htm-card-tag">Section 2</span>
            <h2 className="htm-card-name">Mathematics</h2>
            <p className="htm-card-desc">
              Algebra, advanced math, geometry &amp; data analysis under
              pressure
            </p>
            <div className="htm-stat-row">
              <span className="htm-stat-pill">🔢 22 Questions</span>
              <span className="htm-stat-pill">⏱️ 35 min</span>
              <span className="htm-stat-pill">🔥 Hard tier</span>
            </div>
          </div>
        </div>
      </div>

      {/* CTA bar */}
      <div className={`htm-cta-bar${!selected ? " hidden" : ""}`}>
        <div className="htm-cta-inner">
          <button className="htm-start-btn" onClick={handleStartModule}>
            🏆 Start{" "}
            {selected === "EBRW"
              ? "Reading & Writing"
              : selected === "MATH"
                ? "Mathematics"
                : ""}{" "}
            Module
          </button>
          <p className="htm-start-label">
            Tap again to <span>deselect</span>
          </p>
        </div>
      </div>
    </div>
  );
};
