// ArchiveSummaryBar.js
// Displays four stat cards for archive lifecycle states: ACTIVE, ARCHIVED, RETURNED, CLOSED.
// Fetches counts from /api/ivanti/archive/stats on mount.

import React, { useState, useEffect } from 'react';
import { Activity, Archive, RotateCcw, XCircle, Loader } from 'lucide-react';

const API_BASE = process.env.REACT_APP_API_BASE || 'http://localhost:3001/api';

const STATE_CONFIG = [
  {
    key: 'ACTIVE',
    label: 'Active',
    color: '#0EA5E9',
    Icon: Activity,
  },
  {
    key: 'ARCHIVED',
    label: 'Archived',
    color: '#F59E0B',
    Icon: Archive,
  },
  {
    key: 'RETURNED',
    label: 'Returned',
    color: '#10B981',
    Icon: RotateCcw,
  },
  {
    key: 'CLOSED',
    label: 'Closed',
    color: '#EF4444',
    Icon: XCircle,
  },
];

function StatCard({ stateKey, label, color, Icon, count, active, onClick }) {
  const [hovered, setHovered] = useState(false);

  const isHighlighted = active || hovered;

  const cardStyle = {
    flex: '1 1 0',
    minWidth: '140px',
    background: 'linear-gradient(135deg, rgba(30, 41, 59, 0.95), rgba(51, 65, 85, 0.9))',
    border: `2px solid ${isHighlighted ? color : `rgba(${hexToRgb(color)}, 0.3)`}`,
    borderRadius: '0.5rem',
    padding: '1rem',
    cursor: 'pointer',
    transition: 'all 0.3s cubic-bezier(0.4, 0, 0.2, 1)',
    transform: isHighlighted ? 'translateY(-2px)' : 'translateY(0)',
    boxShadow: isHighlighted
      ? `0 4px 16px rgba(0, 0, 0, 0.5), 0 0 20px rgba(${hexToRgb(color)}, 0.25)`
      : '0 4px 16px rgba(0, 0, 0, 0.5)',
    position: 'relative',
    overflow: 'hidden',
  };

  const accentLineStyle = {
    position: 'absolute',
    top: 0,
    left: 0,
    right: 0,
    height: '2px',
    background: `linear-gradient(90deg, transparent, ${color}, transparent)`,
    boxShadow: `0 0 8px ${color}`,
  };

  return (
    <div
      style={cardStyle}
      onClick={() => onClick(stateKey)}
      onMouseEnter={() => setHovered(true)}
      onMouseLeave={() => setHovered(false)}
      role="button"
      tabIndex={0}
      onKeyDown={(e) => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); onClick(stateKey); } }}
      aria-label={`${label}: ${count} findings. ${active ? 'Currently filtered.' : 'Click to filter.'}`}
    >
      <div style={accentLineStyle} />
      <div style={{ display: 'flex', alignItems: 'center', gap: '0.5rem', marginBottom: '0.625rem' }}>
        <Icon
          style={{
            width: '16px',
            height: '16px',
            color: color,
            filter: isHighlighted ? `drop-shadow(0 0 4px ${color})` : 'none',
          }}
        />
        <span style={{
          fontFamily: "'JetBrains Mono', 'Fira Code', monospace",
          fontSize: '0.7rem',
          fontWeight: '600',
          color: color,
          textTransform: 'uppercase',
          letterSpacing: '0.08em',
          textShadow: isHighlighted ? `0 0 8px rgba(${hexToRgb(color)}, 0.5)` : 'none',
        }}>
          {label}
        </span>
      </div>
      <div style={{
        fontFamily: "'JetBrains Mono', 'Fira Code', monospace",
        fontSize: '1.75rem',
        fontWeight: '700',
        color: '#F8FAFC',
        lineHeight: 1,
        textShadow: `0 0 16px rgba(${hexToRgb(color)}, 0.3)`,
      }}>
        {count != null ? count : '—'}
      </div>
    </div>
  );
}

// Convert hex color to r, g, b string for use in rgba()
function hexToRgb(hex) {
  const r = parseInt(hex.slice(1, 3), 16);
  const g = parseInt(hex.slice(3, 5), 16);
  const b = parseInt(hex.slice(5, 7), 16);
  return `${r}, ${g}, ${b}`;
}

export default function ArchiveSummaryBar({ onStateClick, activeFilter }) {
  const [stats, setStats] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(false);

  useEffect(() => {
    let cancelled = false;
    const load = async () => {
      setLoading(true);
      setError(false);
      try {
        const res = await fetch(`${API_BASE}/ivanti/archive/stats`, { credentials: 'include' });
        if (res.ok && !cancelled) {
          const data = await res.json();
          setStats(data);
        } else if (!cancelled) {
          setError(true);
        }
      } catch {
        if (!cancelled) setError(true);
      } finally {
        if (!cancelled) setLoading(false);
      }
    };
    load();
    return () => { cancelled = true; };
  }, []);

  if (loading) {
    return (
      <div style={{
        display: 'flex', alignItems: 'center', justifyContent: 'center',
        gap: '0.5rem', padding: '1.25rem',
        color: '#94A3B8', fontFamily: 'monospace', fontSize: '0.75rem',
      }}>
        <Loader style={{ width: '14px', height: '14px', animation: 'spin 1s linear infinite' }} />
        Loading archive stats…
      </div>
    );
  }

  if (error) {
    return (
      <div style={{
        padding: '1rem', textAlign: 'center',
        color: '#94A3B8', fontFamily: 'monospace', fontSize: '0.72rem',
        border: '1px dashed rgba(239, 68, 68, 0.2)', borderRadius: '0.375rem',
      }}>
        Unable to load archive statistics
      </div>
    );
  }

  const handleClick = (state) => {
    if (onStateClick) onStateClick(state);
  };

  return (
    <div style={{
      display: 'flex',
      gap: '0.75rem',
      marginBottom: '1.25rem',
      flexWrap: 'wrap',
    }}>
      {STATE_CONFIG.map(({ key, label, color, Icon }) => (
        <StatCard
          key={key}
          stateKey={key}
          label={label}
          color={color}
          Icon={Icon}
          count={stats?.[key] ?? 0}
          active={activeFilter === key}
          onClick={handleClick}
        />
      ))}
    </div>
  );
}