import { useState, type CSSProperties } from 'react';
import type { Achievement } from '../network/api';

interface AchievementsPanelProps {
  achievements: Achievement[];
}

const buttonStyle: CSSProperties = {
  position: 'fixed',
  top: 12,
  right: 240,
  zIndex: 50,
  display: 'flex',
  alignItems: 'center',
  gap: 4,
  padding: '5px 10px',
  borderRadius: 8,
  border: '1px solid rgba(255, 215, 0, 0.2)',
  backgroundColor: 'rgba(0,0,0,0.55)',
  color: '#daa520',
  fontSize: 11,
  fontWeight: 600,
  cursor: 'pointer',
  pointerEvents: 'auto',
  userSelect: 'none',
};

const panelStyle: CSSProperties = {
  position: 'fixed',
  top: 12,
  right: 240,
  zIndex: 50,
  width: 260,
  maxHeight: 340,
  borderRadius: 10,
  border: '1px solid rgba(255, 215, 0, 0.15)',
  backgroundColor: 'rgba(10, 10, 20, 0.88)',
  backdropFilter: 'blur(6px)',
  overflow: 'hidden',
  pointerEvents: 'auto',
  display: 'flex',
  flexDirection: 'column',
};

const panelHeaderStyle: CSSProperties = {
  display: 'flex',
  justifyContent: 'space-between',
  alignItems: 'center',
  padding: '7px 10px',
  borderBottom: '1px solid rgba(255,255,255,0.08)',
  fontSize: 12,
  fontWeight: 700,
  color: '#daa520',
  flexShrink: 0,
};

const closeButtonStyle: CSSProperties = {
  background: 'none',
  border: 'none',
  color: '#888',
  fontSize: 14,
  cursor: 'pointer',
  padding: '0 4px',
  lineHeight: 1,
};

const listStyle: CSSProperties = {
  padding: '6px 10px 8px',
  overflowY: 'auto',
  flex: 1,
};

function achievementRowStyle(unlocked: boolean): CSSProperties {
  return {
    marginBottom: 8,
    padding: '6px 8px',
    borderRadius: 6,
    border: unlocked
      ? '1px solid rgba(255, 215, 0, 0.5)'
      : '1px solid rgba(255, 255, 255, 0.08)',
    backgroundColor: unlocked
      ? 'rgba(255, 215, 0, 0.06)'
      : 'rgba(255, 255, 255, 0.02)',
  };
}

const titleRowStyle: CSSProperties = {
  display: 'flex',
  justifyContent: 'space-between',
  alignItems: 'center',
  marginBottom: 3,
};

const progressBarBgStyle: CSSProperties = {
  width: '100%',
  height: 5,
  borderRadius: 3,
  backgroundColor: 'rgba(255,255,255,0.08)',
  overflow: 'hidden',
  marginTop: 4,
};

function progressBarFillStyle(pct: number, unlocked: boolean): CSSProperties {
  return {
    width: `${Math.min(100, pct)}%`,
    height: '100%',
    borderRadius: 3,
    backgroundColor: unlocked ? '#ffd700' : '#daa520',
    transition: 'width 300ms ease',
  };
}

function formatDate(iso: string): string {
  try {
    const d = new Date(iso);
    return d.toLocaleDateString(undefined, { month: 'short', day: 'numeric' });
  } catch {
    return '';
  }
}

export function AchievementsPanel({ achievements }: AchievementsPanelProps) {
  const [expanded, setExpanded] = useState(false);

  const unlockedCount = achievements.filter((a) => a.unlocked).length;

  if (!expanded) {
    return (
      <button style={buttonStyle} onClick={() => setExpanded(true)}>
        <span style={{ fontSize: 13 }}>&#x1F3C6;</span>
        <span>{unlockedCount}/{achievements.length}</span>
      </button>
    );
  }

  return (
    <div style={panelStyle}>
      <div style={panelHeaderStyle}>
        <span>&#x1F3C6; Achievements</span>
        <button style={closeButtonStyle} onClick={() => setExpanded(false)}>
          &#x2715;
        </button>
      </div>
      <div style={listStyle}>
        {achievements.map((ach) => {
          const pct = ach.conditionValue > 0
            ? (Math.min(ach.conditionValue, ach.conditionValue) / ach.conditionValue) * 100
            : 0;

          return (
            <div key={ach.id} style={achievementRowStyle(ach.unlocked)}>
              <div style={titleRowStyle}>
                <span style={{
                  fontSize: 11,
                  fontWeight: 600,
                  color: ach.unlocked ? '#ffd700' : '#ccc',
                  opacity: ach.unlocked ? 1 : 0.85,
                }}>
                  {ach.unlocked ? '\u2714 ' : ''}{ach.title}
                </span>
                {ach.unlocked && ach.unlockedAt && (
                  <span style={{ fontSize: 9, color: '#999' }}>
                    {formatDate(ach.unlockedAt)}
                  </span>
                )}
              </div>
              <div style={{ fontSize: 10, color: '#aaa', marginBottom: 2 }}>
                {ach.description}
              </div>
              {!ach.unlocked && (
                <div style={progressBarBgStyle}>
                  <div style={progressBarFillStyle(pct, false)} />
                </div>
              )}
              {ach.unlocked && (
                <div style={{
                  fontSize: 9,
                  color: '#b8860b',
                  marginTop: 2,
                  fontWeight: 600,
                }}>
                  +{ach.rewardAmount} {ach.rewardType}
                </div>
              )}
            </div>
          );
        })}
        {achievements.length === 0 && (
          <div style={{ textAlign: 'center', opacity: 0.5, padding: 8, fontSize: 11, color: '#999' }}>
            No achievements yet
          </div>
        )}
      </div>
    </div>
  );
}