import { PureComponent } from 'react';
import Box from '@mui/material/Box';
import Button from '@mui/material/Button';
import AppDialog from '../AppDialog';
import DialogActions from '@mui/material/DialogActions';
import DialogContent from '@mui/material/DialogContent';
import DialogTitle from '@mui/material/DialogTitle';
import IconButton from '@mui/material/IconButton';
import Typography from '@mui/material/Typography';
import Alert from '@mui/material/Alert';
import CloseIcon from '@mui/icons-material/Close';
import ArticleSearch from '../article/ArticleSearch';

import deliveryEditorAutomat from '../../automats/deliveryEditorAutomat';

export default class ArticleSearchDialog extends PureComponent {
  constructor(props) {
    super(props);
    this.state = {
      assigningSku: null,
      error: null,
    };
  }

  componentDidUpdate(prevProps) {
    if (!prevProps.open && this.props.open) {
      this.setState({ assigningSku: null, error: null });
    }
  }

  handleClose = () => {
    this.setState({ assigningSku: null, error: null });
    this.props.onClose?.();
  };

  handleSelect = async (article) => {
    const { onAssign, line, kind = 'delivery' } = this.props;
    const isDelivery = kind === 'delivery';
    if (!onAssign || !article?.sku) return;

    if (article.isParent || article.is_parent) {
      this.setState({ error: 'Ein Vaterartikel kann nicht auf Belege gebucht werden.' });
      return;
    }

    this.setState({ assigningSku: article.sku, error: null });
    try {
      await onAssign(article, line);
    } catch (err) {
      this.setState({
        error:
          err?.message ||
          (isDelivery
            ? (line ? 'Fehler beim Verknüpfen des Lieferanten-Artikels.' : 'Fehler beim Hinzufügen des Artikels.')
            : 'Fehler beim Zuordnen des Artikels.'),
      });
    } finally {
      this.setState({ assigningSku: null });
    }
  };

  render() {
    const { open, onClose, line, kind = 'delivery', supplierArticles: propSupplierArticles } = this.props;
    const { assigningSku, error } = this.state;
    const isDelivery = kind === 'delivery';
    const onlySupplierArticles = isDelivery && !line;
    const rawSku = line?.sku != null ? String(line.sku).trim() : '';

    const supplierArticlesList = onlySupplierArticles
      ? (propSupplierArticles ?? deliveryEditorAutomat.state.supplierArticles ?? [])
      : null;

    const includeSkus = onlySupplierArticles
      ? supplierArticlesList.map((sa) => sa.article?.sku || sa.sku).filter(Boolean)
      : null;

    const extraArticles = onlySupplierArticles
      ? supplierArticlesList.map((sa) => ({
          id: sa.article?.id ?? sa.id,
          sku: sa.article?.sku || sa.sku,
          name: sa.article?.name || sa.name || sa.sku || '',
          brand: sa.article?.brand,
          brandName: sa.article?.brand?.name || sa.article?.brandName,
          stock: sa.article?.stock ?? sa.stock,
          available: sa.article?.available,
          price: sa.price?.net ?? sa.article?.price ?? sa.article?.vknetto,
          eans: sa.article?.eans || [sa.sku].filter(Boolean),
          isParent: false,
        }))
      : [];

    return (
      <AppDialog
        open={Boolean(open)}
        onClose={this.handleClose}
        maxWidth="md"
        fullWidth
        aria-labelledby="article-search-dialog-title"
        slotProps={{
          paper: {
            sx: {
              height: '80vh',
              minHeight: '80vh',
              maxHeight: '80vh',
              display: 'flex',
              flexDirection: 'column',
              overflow: 'hidden',
            },
          },
        }}
      >
        <DialogTitle
          id="article-search-dialog-title"
          sx={{
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'space-between',
            pb: 1,
            flexShrink: 0,
          }}
        >
          <Box>
            <Typography variant="h6" component="div" fontWeight={600}>
              {line
                ? 'Existierenden Artikel zuordnen'
                : isDelivery
                  ? 'Lieferanten-Artikel auswählen'
                  : 'Artikel auswählen'}
            </Typography>
            <Typography variant="caption" color="text.secondary">
              {line ? (
                <>
                  {isDelivery ? 'Lieferanten-SKU' : 'SKU'}: <strong>{rawSku || '–'}</strong>
                  {line?.name ? ` · ${line.name}` : ''}
                </>
              ) : isDelivery ? (
                'Nur mit dem ausgewählten Lieferanten verknüpfte Artikel'
              ) : (
                'Artikel für Beleg auswählen'
              )}
            </Typography>
          </Box>
          <IconButton
            size="small"
            aria-label="Schließen"
            onClick={this.handleClose}
          >
            <CloseIcon fontSize="small" />
          </IconButton>
        </DialogTitle>

        <DialogContent
          dividers
          sx={{
            p: 2,
            display: 'flex',
            flexDirection: 'column',
            flex: 1,
            minHeight: 0,
            overflow: 'hidden',
          }}
        >
          {error && (
            <Alert severity="error" sx={{ mb: 2, flexShrink: 0 }}>
              {error}
            </Alert>
          )}

          {onlySupplierArticles && supplierArticlesList.length === 0 && (
            <Alert severity="info" sx={{ mb: 2, flexShrink: 0 }}>
              Für diesen Lieferanten sind noch keine Artikel verknüpft.
            </Alert>
          )}

          <ArticleSearch
            mode="list"
            autoFocus
            allowParent={false}
            busySku={assigningSku}
            initialQuery={line?.name ? String(line.name) : ''}
            includeSkus={includeSkus}
            extraArticles={extraArticles}
            actionLabel={assigningSku ? (line ? 'Zuordnen…' : 'Hinzufügen…') : (line ? 'Zuordnen' : 'Hinzufügen')}
            onSelect={this.handleSelect}
          />
        </DialogContent>

        <DialogActions sx={{ px: 2, py: 1.5 }}>
          <Button
            size="small"
            onClick={this.handleClose}
          >
            Abbrechen
          </Button>
        </DialogActions>
      </AppDialog>
    );
  }
}