import { useEffect, useState } from "react";
import { ConfettiBurst } from "./ConfettiBurst";

type Props = {
  size?: number;
  strokeWidth?: number;
  previousXP: number;
  gainedXP: number;
  levelMinXP: number;
  levelMaxXP: number;
  level: number;
};

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

  .clp-wrap {
    width: 100%;
    font-family: 'Nunito', sans-serif;
  }

  /* Outer card — full width */
  .clp-card {
    width: 100%;
    background: white;
    border: 2.5px solid #f3f4f6;
    border-radius: 24px;
    padding: 1.25rem 1.5rem;
    box-shadow: 0 6px 24px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    box-sizing: border-box;
  }

  /* Top row: level badge + XP gained chip */
  .clp-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .clp-level-badge {
    display: flex;
    align-items: center;
    gap: 0.6rem;
  }

  .clp-level-bubble {
    width: 52px; height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, #c084fc, #a855f7);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 0 #7e22ce44;
    flex-shrink: 0;
  }

  .clp-level-num {
    font-size: 1.5rem;
    font-weight: 900;
    color: white;
    line-height: 1;
    letter-spacing: -0.02em;
  }

  .clp-level-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
  }

  .clp-level-word {
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: #9ca3af;
  }

  .clp-level-title {
    font-size: 1rem;
    font-weight: 900;
    color: #1e1b4b;
    line-height: 1;
  }

  /* XP gained chip */
  .clp-xp-chip {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: #fff7ed;
    border: 2px solid #fed7aa;
    border-radius: 100px;
    padding: 0.4rem 0.9rem;
    font-size: 0.82rem;
    font-weight: 800;
    color: #f97316;
  }

  /* Bar section */
  .clp-bar-wrap {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .clp-bar-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.66rem;
    font-weight: 700;
    color: #9ca3af;
  }

  .clp-bar-track {
    width: 100%;
    height: 12px;
    background: #f3f4f6;
    border-radius: 100px;
    overflow: hidden;
  }

  .clp-bar-fill {
    height: 100%;
    border-radius: 100px;
    background: linear-gradient(90deg, #c084fc, #f97316);
    transition: width 1.2s cubic-bezier(0.4,0,0.2,1);
  }

  /* XP total */
  .clp-xp-pill {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.72rem;
    font-weight: 700;
    color: #9ca3af;
    animation: clpFadeUp 0.5s cubic-bezier(0.34,1.56,0.64,1) both;
  }

  .clp-xp-pill .xp-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: #f97316;
    flex-shrink: 0;
  }

  /* Level-up banner */
  .clp-levelup {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: #fdf4ff;
    border: 2.5px solid #e9d5ff;
    border-radius: 14px;
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
    font-weight: 900;
    color: #9333ea;
    animation: clpPop 0.45s cubic-bezier(0.34,1.56,0.64,1) both;
    box-shadow: 0 4px 12px rgba(147,51,234,0.1);
  }

  @keyframes clpPop {
    from { opacity:0; transform: scale(0.8); }
    to   { opacity:1; transform: scale(1); }
  }
  @keyframes clpFadeUp {
    from { opacity:0; transform: translateY(6px); }
    to   { opacity:1; transform: translateY(0); }
  }
`;

export const CircularLevelProgress = ({
  previousXP,
  gainedXP,
  levelMinXP,
  levelMaxXP,
  level,
}: Props) => {
  const levelRange = levelMaxXP - levelMinXP;

  const normalize = (xp: number) =>
    Math.min(Math.max(xp - levelMinXP, 0), levelRange) / levelRange;

  const [barProgress, setBarProgress] = useState(normalize(previousXP));
  const [currentLevel, setCurrentLevel] = useState(level);
  const [showLevelUp, setShowLevelUp] = useState(false);
  const [showXPTotal, setShowXPTotal] = useState(false);

  useEffect(() => {
    let animationFrame: number;
    let start: number | null = null;

    const availableXP = previousXP + gainedXP;
    const crossesLevel = availableXP >= levelMaxXP;
    const phase1Target = crossesLevel ? 1 : normalize(availableXP);
    const leftoverXP = crossesLevel ? availableXP - levelMaxXP : 0;
    const duration = 1200;

    const animatePhase1 = (timestamp: number) => {
      if (!start) start = timestamp;
      const t = Math.min((timestamp - start) / duration, 1);
      setBarProgress(
        normalize(previousXP) + t * (phase1Target - normalize(previousXP)),
      );
      if (t < 1) {
        animationFrame = requestAnimationFrame(animatePhase1);
      } else if (crossesLevel) {
        setShowLevelUp(true);
        setTimeout(startPhase2, 1200);
      } else {
        setShowXPTotal(true);
      }
    };

    const startPhase2 = () => {
      start = null;
      setShowLevelUp(false);
      setCurrentLevel((l) => l + 1);
      setBarProgress(0);
      const target = Math.min(leftoverXP / levelRange, 1);

      const animatePhase2 = (timestamp: number) => {
        if (!start) start = timestamp;
        const t = Math.min((timestamp - start) / duration, 1);
        setBarProgress(t * target);
        if (t < 1) {
          animationFrame = requestAnimationFrame(animatePhase2);
        } else {
          setShowXPTotal(true);
        }
      };
      animationFrame = requestAnimationFrame(animatePhase2);
    };

    animationFrame = requestAnimationFrame(animatePhase1);
    return () => cancelAnimationFrame(animationFrame);
  }, []);

  const barPct = Math.round(barProgress * 100);
  const totalXP = previousXP + gainedXP;

  return (
    <div className="clp-wrap">
      <style>{STYLES}</style>
      {showLevelUp && <ConfettiBurst />}

      <div className="clp-card">
        {/* Top row */}
        <div className="clp-top-row">
          <div className="clp-level-badge">
            <div className="clp-level-bubble">
              <span className="clp-level-num">{currentLevel}</span>
            </div>
            <div className="clp-level-text">
              <span className="clp-level-word">Current Level</span>
              <span className="clp-level-title">Level {currentLevel}</span>
            </div>
          </div>

          <div className="clp-xp-chip">⚡ +{gainedXP} XP</div>
        </div>

        {/* Progress bar */}
        <div className="clp-bar-wrap">
          <div className="clp-bar-labels">
            <span>{levelMinXP} XP</span>
            <span>{barPct}%</span>
            <span>{levelMaxXP} XP</span>
          </div>
          <div className="clp-bar-track">
            <div className="clp-bar-fill" style={{ width: `${barPct}%` }} />
          </div>
        </div>

        {/* Footer state */}
        {showLevelUp && (
          <div className="clp-levelup">
            🎉 You leveled up! Welcome to Level {currentLevel}!
          </div>
        )}
        {showXPTotal && !showLevelUp && (
          <div className="clp-xp-pill">
            <div className="xp-dot" />
            Total XP:{" "}
            <strong style={{ color: "#1e1b4b", marginLeft: 3 }}>
              {totalXP}
            </strong>
          </div>
        )}
      </div>
    </div>
  );
};