/**
 * ContestPanel Component
 * Displays upcoming and active contests with live indicators
 */
import React from 'react';

export const ContestPanel = ({ data, loading }) => {
  const getModeColor = (mode) => {
    switch(mode) {
      case 'CW': return 'var(--accent-cyan)';
      case 'SSB': return 'var(--accent-amber)';
      case 'RTTY': return 'var(--accent-purple)';
      case 'FT8': case 'FT4': return 'var(--accent-green)';
      case 'Mixed': return 'var(--text-secondary)';
      default: return 'var(--text-secondary)';
    }
  };

  const formatDate = (dateStr) => {
    if (!dateStr) return '';
    const date = new Date(dateStr);
    return date.toLocaleDateString('en-US', { month: 'short', day: 'numeric' });
  };

  const formatTime = (dateStr) => {
    if (!dateStr) return '';
    const date = new Date(dateStr);
    return date.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', hour12: false }) + 'z';
  };

  // Check if contest is live (happening now)
  const isContestLive = (contest) => {
    if (!contest.start || !contest.end) return false;
    const now = new Date();
    const start = new Date(contest.start);
    const end = new Date(contest.end);
    return now >= start && now <= end;
  };

  // Check if contest starts within 24 hours
  const isStartingSoon = (contest) => {
    if (!contest.start) return false;
    const now = new Date();
    const start = new Date(contest.start);
    const hoursUntil = (start - now) / (1000 * 60 * 60);
    return hoursUntil > 0 && hoursUntil <= 24;
  };

  // Get time remaining or time until start
  const getTimeInfo = (contest) => {
    if (!contest.start || !contest.end) return formatDate(contest.start);
    
    const now = new Date();
    const start = new Date(contest.start);
    const end = new Date(contest.end);
    
    if (now >= start && now <= end) {
      // Contest is live - show time remaining
      const hoursLeft = Math.floor((end - now) / (1000 * 60 * 60));
      const minsLeft = Math.floor(((end - now) % (1000 * 60 * 60)) / (1000 * 60));
      if (hoursLeft > 0) {
        return `${hoursLeft}h ${minsLeft}m left`;
      }
      return `${minsLeft}m left`;
    } else if (now < start) {
      // Contest hasn't started
      const hoursUntil = Math.floor((start - now) / (1000 * 60 * 60));
      if (hoursUntil < 24) {
        return `Starts in ${hoursUntil}h`;
      }
      return formatDate(contest.start);
    }
    return formatDate(contest.start);
  };

  // Sort contests: live first, then starting soon, then by date
  const sortedContests = data ? [...data].sort((a, b) => {
    const aLive = isContestLive(a);
    const bLive = isContestLive(b);
    const aSoon = isStartingSoon(a);
    const bSoon = isStartingSoon(b);
    
    if (aLive && !bLive) return -1;
    if (!aLive && bLive) return 1;
    if (aSoon && !bSoon) return -1;
    if (!aSoon && bSoon) return 1;
    
    return new Date(a.start) - new Date(b.start);
  }) : [];

  // Count live contests
  const liveCount = sortedContests.filter(isContestLive).length;

  return (
    <div className="panel" style={{ padding: '8px', height: '100%', display: 'flex', flexDirection: 'column' }}>
      <div style={{ 
        marginBottom: '6px',
        fontSize: '11px',
        display: 'flex',
        justifyContent: 'space-between',
        alignItems: 'center',
        color: 'var(--accent-primary)',
        fontWeight: '700'
      }}>
        <span>🏆 CONTESTS</span>
        {liveCount > 0 && (
          <span style={{ 
            background: 'rgba(239, 68, 68, 0.3)', 
            color: '#ef4444', 
            padding: '2px 6px', 
            borderRadius: '4px',
            fontSize: '9px',
            fontWeight: '700',
            border: '1px solid #ef4444'
          }}>
            🔴 {liveCount} LIVE
          </span>
        )}
      </div>
      
      <div style={{ flex: 1, overflowY: 'auto' }}>
        {loading ? (
          <div style={{ display: 'flex', justifyContent: 'center', padding: '10px' }}>
            <div className="loading-spinner" />
          </div>
        ) : sortedContests.length > 0 ? (
          <div style={{ fontSize: '10px', fontFamily: 'JetBrains Mono, monospace' }}>
            {sortedContests.slice(0, 4).map((contest, i) => {
              const live = isContestLive(contest);
              const soon = isStartingSoon(contest);
              
              return (
                <div 
                  key={`${contest.name}-${i}`}
                  style={{ 
                    padding: '5px 6px',
                    marginBottom: '3px',
                    borderRadius: '4px',
                    background: live ? 'rgba(239, 68, 68, 0.15)' : soon ? 'rgba(251, 191, 36, 0.1)' : 'rgba(255,255,255,0.03)',
                    border: live ? '1px solid rgba(239, 68, 68, 0.4)' : '1px solid transparent'
                  }}
                >
                  <div style={{ 
                    display: 'flex',
                    alignItems: 'center',
                    gap: '6px'
                  }}>
                    {live && (
                      <span style={{ 
                        color: '#ef4444', 
                        fontSize: '8px',
                        animation: 'pulse 1.5s infinite'
                      }}>●</span>
                    )}
                    {soon && !live && (
                      <span style={{ color: '#fbbf24', fontSize: '8px' }}>◐</span>
                    )}
                    <span style={{ 
                      color: live ? '#ef4444' : 'var(--text-primary)', 
                      fontWeight: '600',
                      flex: 1,
                      whiteSpace: 'nowrap',
                      overflow: 'hidden',
                      textOverflow: 'ellipsis'
                    }}>
                      {contest.name}
                    </span>
                  </div>
                  <div style={{ display: 'flex', justifyContent: 'space-between', marginTop: '3px' }}>
                    <span style={{ color: getModeColor(contest.mode) }}>{contest.mode}</span>
                    <span style={{ 
                      color: live ? '#ef4444' : soon ? '#fbbf24' : 'var(--text-muted)',
                      fontWeight: live ? '600' : '400'
                    }}>
                      {getTimeInfo(contest)}
                    </span>
                  </div>
                </div>
              );
            })}
          </div>
        ) : (
          <div style={{ textAlign: 'center', color: 'var(--text-muted)', padding: '10px', fontSize: '11px' }}>
            No upcoming contests
          </div>
        )}
      </div>
      
      {/* Contest Calendar Credit */}
      <div style={{ 
        marginTop: '4px', 
        paddingTop: '4px', 
        borderTop: '1px solid var(--border-color)',
        textAlign: 'right'
      }}>
        <a 
          href="https://www.contestcalendar.com" 
          target="_blank" 
          rel="noopener noreferrer"
          style={{ 
            fontSize: '9px', 
            color: 'var(--text-muted)', 
            textDecoration: 'none'
          }}
        >
          WA7BNM Contest Calendar
        </a>
      </div>
    </div>
  );
};

export default ContestPanel;
