/**
 * Карточка урока для Dashboard
 */

'use client';

import React, { useState, useEffect, useCallback } from 'react';
import { useRouter } from 'next/navigation';
import { LessonPreview } from '@/api/dashboard';
import { createLiveKitRoom } from '@/api/livekit';

interface LessonCardProps {
  lesson: LessonPreview;
  showMentor?: boolean;
  showClient?: boolean;
  onClick?: () => void;
}

/** Подключение доступно за 10 минут до начала и до 15 минут после окончания */
function canJoinLesson(lesson: LessonPreview): boolean {
  if (!lesson.start_time || !lesson.end_time) return false;
  if (lesson.status === 'cancelled') return false;
  const now = new Date();
  const startTime = new Date(lesson.start_time);
  const endTime = new Date(lesson.end_time);
  const allowedStart = new Date(startTime.getTime() - 10 * 60 * 1000); // за 10 минут до начала
  const allowedEnd = new Date(endTime.getTime() + 15 * 60 * 1000); // до 15 минут после окончания
  return now >= allowedStart && now <= allowedEnd;
}

export const LessonCard: React.FC<LessonCardProps> = ({
  lesson,
  showMentor = false,
  showClient = false,
  onClick,
}) => {
  const router = useRouter();
  const [connectLoading, setConnectLoading] = useState(false);
  const [canJoin, setCanJoin] = useState(false);

  useEffect(() => {
    const check = () => setCanJoin(canJoinLesson(lesson));
    check();
    const interval = setInterval(check, 60000);
    return () => clearInterval(interval);
  }, [lesson.start_time, lesson.end_time, lesson.status]);

  const handleConnect = useCallback(
    async (e: React.MouseEvent) => {
      e.stopPropagation();
      if (!canJoin || connectLoading) return;
      setConnectLoading(true);
      try {
        const lessonId = typeof lesson.id === 'string' ? parseInt(lesson.id, 10) : lesson.id;
        const res = await createLiveKitRoom(lessonId);
        router.push(
          `/livekit/${res.room_name}?lesson_id=${lesson.id}&token=${encodeURIComponent(res.access_token)}`
        );
      } catch (err) {
        console.error('LiveKit connect error:', err);
        setConnectLoading(false);
      }
    },
    [canJoin, connectLoading, lesson.id, router]
  );

  const startTime = new Date(lesson.start_time);
  const endTime = new Date(lesson.end_time);

  const getStatusColor = (status: string) => {
    switch (status) {
      case 'completed':
        // более серый фон для завершённых занятий
        return 'color-mix(in srgb, var(--md-sys-color-surface-variant) 70%, #000 10%)';
      case 'in_progress':
        return 'var(--md-sys-color-tertiary)';
      case 'cancelled':
        return 'var(--md-sys-color-error)';
      case 'scheduled':
      default:
        return 'var(--md-sys-color-primary)';
    }
  };

  const getStatusTextColor = (status: string) => {
    switch (status) {
      case 'completed':
        return 'var(--md-sys-color-on-surface-variant)';
      case 'in_progress':
        return 'var(--md-sys-color-on-tertiary)';
      case 'cancelled':
        return 'var(--md-sys-color-on-error)';
      case 'scheduled':
      default:
        return 'var(--md-sys-color-on-primary)';
    }
  };

  const getStatusText = (status: string) => {
    switch (status) {
      case 'completed':
        return 'Завершено';
      case 'in_progress':
        return 'В процессе';
      case 'cancelled':
        return 'Отменено';
      default:
        return 'Запланировано';
    }
  };

  const statusColor = getStatusColor(lesson.status);
  const textColor = getStatusTextColor(lesson.status);

  return (
    <div
      role={onClick ? 'button' : undefined}
      tabIndex={onClick ? 0 : undefined}
      onClick={onClick}
      onKeyDown={onClick ? (e) => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); onClick(); } } : undefined}
      style={{
        background: statusColor,
        borderRadius: '16px',
        padding: '16px',
        marginBottom: '12px',
        transition: 'all 0.2s ease',
        cursor: 'pointer',
        position: 'relative',
      }}
      onMouseEnter={(e) => {
      e.currentTarget.style.boxShadow = '0 4px 12px rgba(0, 0, 0, 0.15)';
      e.currentTarget.style.transform = 'translateY(-2px)';
    }}
    onMouseLeave={(e) => {
      e.currentTarget.style.boxShadow = 'none';
      e.currentTarget.style.transform = 'translateY(0)';
    }}
    >
      <div style={{
        display: 'flex',
        justifyContent: 'space-between',
        alignItems: 'flex-start',
        marginBottom: '12px'
      }}>
        <div style={{ flex: 1 }}>
          <h4 style={{
            fontSize: '16px',
            fontWeight: '500',
            color: textColor,
            margin: '0 0 4px 0'
          }}>
            {lesson.title}
          </h4>
          {lesson.subject && (
            <p style={{
              fontSize: '14px',
              color: textColor,
              margin: '0',
              opacity: 0.9
            }}>
              {lesson.subject}
            </p>
          )}
        </div>
        <span style={{
          fontSize: '12px',
          padding: '4px 10px',
          borderRadius: '12px',
          background: 'rgba(255, 255, 255, 0.25)',
          color: textColor,
          fontWeight: '500'
        }}>
          {getStatusText(lesson.status)}
        </span>
      </div>

      <div style={{
        display: 'flex',
        alignItems: 'center',
        gap: '16px',
        fontSize: '14px',
        color: textColor,
        opacity: 0.9
      }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: '4px' }}>
          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
            <circle cx="12" cy="12" r="10"></circle>
            <polyline points="12 6 12 12 16 14"></polyline>
          </svg>
          <span>
            {startTime.toLocaleDateString('ru-RU', { 
              day: 'numeric',
              month: 'short'
            })}
            {' в '}
            {startTime.toLocaleTimeString('ru-RU', { 
              hour: '2-digit',
              minute: '2-digit'
            })}
            {' - '}
            {endTime.toLocaleTimeString('ru-RU', { 
              hour: '2-digit',
              minute: '2-digit'
            })}
          </span>
        </div>
      </div>

      {(showMentor && lesson.mentor) && (
        <div style={{
          marginTop: '12px',
          paddingTop: '12px',
          borderTop: `1px solid color-mix(in srgb, ${textColor} 40%, transparent)`,
          fontSize: '14px',
          color: textColor,
          opacity: 0.9
        }}>
          Ментор: {lesson.mentor.first_name} {lesson.mentor.last_name}
        </div>
      )}

      {(showClient && lesson.client) && (
        <div style={{
          marginTop: '12px',
          paddingTop: '12px',
          borderTop: `1px solid color-mix(in srgb, ${textColor} 40%, transparent)`,
          fontSize: '14px',
          color: textColor,
          opacity: 0.9
        }}>
          Ученик: {lesson.client.first_name} {lesson.client.last_name}
        </div>
      )}

      {canJoin && (lesson.status === 'scheduled' || lesson.status === 'in_progress') && (
        <button
          type="button"
          onClick={handleConnect}
          disabled={connectLoading}
          style={{
            marginTop: '12px',
            width: '100%',
            padding: '10px 16px',
            borderRadius: '12px',
            border: 'none',
            background: 'rgba(255, 255, 255, 0.9)',
            color: statusColor,
            fontSize: '14px',
            fontWeight: '600',
            cursor: connectLoading ? 'wait' : 'pointer',
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'center',
            gap: '8px',
          }}
        >
          {connectLoading ? (
            <>
              <span className="material-symbols-outlined" style={{ fontSize: 18, animation: 'spin 1s linear infinite' }}>
                progress_activity
              </span>
              Подключение...
            </>
          ) : (
            <>
              <span className="material-symbols-outlined" style={{ fontSize: 18 }}>
                videocam
              </span>
              Подключиться к уроку
            </>
          )}
        </button>
      )}
    </div>
  );
};