import { useState, useEffect } from 'react';
import {
  Card,
  CardMedia,
  CardActionArea,
  Box,
  IconButton,
  CircularProgress,
  Typography,
  Checkbox,
} from '@mui/material';
import {
  PlayCircleOutline as VideoIcon,
  CheckCircle as CheckedIcon,
} from '@mui/icons-material';
import type { Asset } from '../types';
import api from '../services/api';

interface MediaCardProps {
  asset: Asset;
  selected?: boolean;
  onSelect?: (assetId: string, selected: boolean) => void;
  onClick?: () => void;
}

export default function MediaCard({ asset, selected, onSelect, onClick }: MediaCardProps) {
  const [thumbnailUrl, setThumbnailUrl] = useState<string>('');
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(false);

  useEffect(() => {
    loadThumbnail();
  }, [asset.id]);

  const loadThumbnail = async () => {
    try {
      setLoading(true);
      setError(false);
      // Load media through backend proxy with auth
      const kind = asset.storage_key_thumb ? 'thumb' : 'original';
      if (asset.type === 'photo' || asset.storage_key_thumb) {
        const blob = await api.getMediaBlob(asset.id, kind);
        const url = URL.createObjectURL(blob);
        setThumbnailUrl(url);
      }
    } catch (err) {
      console.error('Failed to load thumbnail:', err);
      setError(true);
    } finally {
      setLoading(false);
    }
  };

  const formatFileSize = (bytes: number): string => {
    if (bytes < 1024) return bytes + ' B';
    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
    if (bytes < 1024 * 1024 * 1024) return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
    return (bytes / (1024 * 1024 * 1024)).toFixed(1) + ' GB';
  };

  const formatDate = (dateString: string): string => {
    const date = new Date(dateString);
    return date.toLocaleDateString('ru-RU', {
      day: 'numeric',
      month: 'short',
      year: 'numeric',
    });
  };

  const handleSelect = (e: React.MouseEvent) => {
    e.stopPropagation();
    if (onSelect) {
      onSelect(asset.id, !selected);
    }
  };

  return (
    <Card
      sx={{
        position: 'relative',
        aspectRatio: '1',
        borderRadius: 2,
        overflow: 'hidden',
        transition: 'transform 0.2s, box-shadow 0.2s',
        '&:hover': {
          transform: 'translateY(-4px)',
          boxShadow: 4,
        },
      }}
    >
      <CardActionArea onClick={onClick} sx={{ height: '100%' }}>
        {loading && (
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              justifyContent: 'center',
              height: '100%',
              bgcolor: 'grey.200',
            }}
          >
            <CircularProgress />
          </Box>
        )}

        {error && (
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              justifyContent: 'center',
              height: '100%',
              bgcolor: 'grey.300',
            }}
          >
            <Typography color="error">Ошибка загрузки</Typography>
          </Box>
        )}

        {!loading && !error && thumbnailUrl && (
          <CardMedia
            component="img"
            image={thumbnailUrl}
            alt={asset.original_filename}
            sx={{
              width: '100%',
              height: '100%',
              objectFit: 'cover',
            }}
          />
        )}

        {asset.type === 'video' && (
          <Box
            sx={{
              position: 'absolute',
              top: 8,
              right: 8,
              color: 'white',
              bgcolor: 'rgba(0,0,0,0.5)',
              borderRadius: '50%',
            }}
          >
            <VideoIcon fontSize="large" />
          </Box>
        )}

        <Box
          sx={{
            position: 'absolute',
            bottom: 0,
            left: 0,
            right: 0,
            bgcolor: 'rgba(0,0,0,0.6)',
            color: 'white',
            p: 1,
          }}
        >
          <Typography variant="caption" display="block" noWrap>
            {asset.original_filename}
          </Typography>
          <Typography variant="caption" display="block">
            {formatFileSize(asset.size_bytes)} • {formatDate(asset.created_at)}
          </Typography>
        </Box>

        {onSelect && (
          <Checkbox
            checked={selected}
            onClick={handleSelect}
            icon={
              <Box
                sx={{
                  width: 24,
                  height: 24,
                  borderRadius: '50%',
                  border: '2px solid white',
                  bgcolor: 'rgba(0,0,0,0.3)',
                }}
              />
            }
            checkedIcon={<CheckedIcon sx={{ color: 'primary.main' }} />}
            sx={{
              position: 'absolute',
              top: 8,
              left: 8,
            }}
          />
        )}
      </CardActionArea>
    </Card>
  );
}