import { useState, useCallback } from 'react';
import { useNavigate } from 'react-router';
import { Badge } from '@cameleer/design-system';
import type { LogEntryResponse } from '../../api/queries/logs';
import { attributeBadgeColor } from '../../utils/attribute-color';
import styles from './LogEntry.module.css';

function levelColor(level: string): string {
  switch (level?.toUpperCase()) {
    case 'ERROR': return 'var(--error)';
    case 'WARN': return 'var(--warning)';
    case 'INFO': return 'var(--success)';
    case 'DEBUG': return 'var(--running)';
    case 'TRACE': return 'var(--text-muted)';
    default: return 'var(--text-secondary)';
  }
}

function formatTime(iso: string): string {
  const d = new Date(iso);
  const h = String(d.getHours()).padStart(2, '0');
  const m = String(d.getMinutes()).padStart(2, '0');
  const s = String(d.getSeconds()).padStart(2, '0');
  const ms = String(d.getMilliseconds()).padStart(3, '0');
  return `${h}:${m}:${s}.${ms}`;
}

function abbreviateLogger(name: string | null): string {
  if (!name) return '';
  const parts = name.split('.');
  if (parts.length <= 2) return name;
  return parts.slice(0, -1).map((p) => p[0]).join('.') + '.' + parts[parts.length - 1];
}

function truncate(text: string, max: number): string {
  return text.length > max ? text.slice(0, max) + '\u2026' : text;
}

interface LogEntryProps {
  entry: LogEntryResponse;
}

export function LogEntry({ entry }: LogEntryProps) {
  const [expanded, setExpanded] = useState(false);
  const navigate = useNavigate();

  const hasStack = !!entry.stackTrace;
  const hasExchange = !!entry.exchangeId;

  const handleViewExchange = useCallback((e: React.MouseEvent) => {
    e.stopPropagation();
    if (!entry.exchangeId || !entry.application) return;
    const routeId = entry.mdc?.['camel.routeId'] || '_';
    navigate(`/exchanges/${entry.application}/${routeId}/${entry.exchangeId}`);
  }, [entry, navigate]);

  const handleCopyMessage = useCallback(async (e: React.MouseEvent) => {
    e.stopPropagation();
    await navigator.clipboard.writeText(entry.message);
  }, [entry.message]);

  return (
    <div className={`${styles.entry} ${expanded ? styles.expanded : ''}`} onClick={() => setExpanded(!expanded)}>
      <div className={styles.row}>
        <span className={styles.timestamp}>{formatTime(entry.timestamp)}</span>
        <span className={styles.level} style={{ color: levelColor(entry.level) }}>{entry.level}</span>
        {entry.application && <Badge label={entry.application} color={attributeBadgeColor(entry.application)} />}
        <span className={styles.logger} title={entry.loggerName ?? ''}>
          {abbreviateLogger(entry.loggerName)}
        </span>
        <span className={styles.message}>{truncate(entry.message, 200)}</span>
        <span className={styles.chips}>
          {hasStack && <span className={styles.chip}>Stack</span>}
          {hasExchange && (
            <span className={styles.chip} onClick={handleViewExchange}>Exchange</span>
          )}
        </span>
      </div>

      {expanded && (
        <div className={styles.detail}>
          <div className={styles.detailGrid}>
            <span className={styles.detailLabel}>Logger</span>
            <span className={styles.detailValue}>{entry.loggerName}</span>
            <span className={styles.detailLabel}>Thread</span>
            <span className={styles.detailValue}>{entry.threadName}</span>
            <span className={styles.detailLabel}>Instance</span>
            <span className={styles.detailValue}>{entry.instanceId}</span>
            {hasExchange && (
              <>
                <span className={styles.detailLabel}>Exchange</span>
                <span className={styles.detailValue}>
                  <button className={styles.linkBtn} onClick={handleViewExchange}>
                    {entry.exchangeId}
                  </button>
                </span>
              </>
            )}
          </div>

          <div className={styles.fullMessage}>{entry.message}</div>

          {hasStack && (
            <pre className={styles.stackTrace}>{entry.stackTrace}</pre>
          )}

          {entry.mdc && Object.keys(entry.mdc).length > 0 && (
            <div className={styles.mdcSection}>
              <span className={styles.detailLabel}>MDC</span>
              <div className={styles.mdcGrid}>
                {Object.entries(entry.mdc).map(([k, v]) => (
                  <div key={k} className={styles.mdcEntry}>
                    <span className={styles.mdcKey}>{k}</span>
                    <span className={styles.mdcValue}>{v}</span>
                  </div>
                ))}
              </div>
            </div>
          )}

          <div className={styles.actions}>
            {hasExchange && (
              <button className={styles.actionBtn} onClick={handleViewExchange}>
                View Exchange
              </button>
            )}
            <button className={styles.actionBtn} onClick={handleCopyMessage}>
              Copy Message
            </button>
          </div>
        </div>
      )}
    </div>
  );
}