import { Link as RouterLink } from 'react-router-dom';
import Box from '@mui/material/Box';
import Link from '@mui/material/Link';
import TextField from '@mui/material/TextField';
import Typography from '@mui/material/Typography';
import { article } from '../../api';
import { EditablePanelTile, PanelTile, PanelTileGrid } from '../panels';
import { requireObject } from '../../utils/apiShape';
import { formatPrice } from '../../utils/price';
import { formatStock } from '../../pages/artikel/searchFormat';

function PanelValue({ label, children }) {
  if (children == null || children === '') return null;
  return (
    <Box sx={{ mb: 1 }}>
      {label ? (
        <Typography variant="caption" color="text.secondary" display="block">
          {label}
        </Typography>
      ) : null}
      <Typography variant="body2" component="div">
        {children}
      </Typography>
    </Box>
  );
}

function ArticlePhoto() {
  return (
    <Box
      sx={{
        width: 200,
        height: 200,
        maxWidth: '100%',
        bgcolor: 'action.hover',
        borderRadius: 1,
      }}
    />
  );
}

const headerTileSx = {
  p: 1.25,
  minHeight: 0,
};

function CountLine({ label, count }) {
  if (count == null) return null;
  return (
    <Typography variant="body2">
      {label}: {count}
    </Typography>
  );
}

function RelationLine({ label, active, children }) {
  return (
    <Typography variant="body2" sx={{ mb: 0.5 }}>
      {label}:{' '}
      {active ? (
        children ?? 'ja'
      ) : (
        <Typography component="span" variant="body2" color="text.secondary">
          nein
        </Typography>
      )}
    </Typography>
  );
}

function articleBrutto(article) {
  if (article.net == null || article.taxRate == null) return null;
  return article.net * (1 + article.taxRate / 100);
}

function nameDraftDirty(draft, saved) {
  return draft.name.trim() !== String(saved.name ?? '').trim();
}

function nameDraftValid(draft) {
  return draft.name.trim().length > 0;
}

export default function ArticleView({ article: articleData, onArticleUpdated }) {
  const brutto = articleBrutto(articleData);

  const handleSaveName = async (draft) => {
    const name = draft.name.trim();
    const res = await article.update(articleData.sku, { name });
    requireObject(res, 'PATCH /api/article/:sku');
    requireObject(res.article, 'article');
    onArticleUpdated?.(res.article);
  };

  return (
    <PanelTileGrid>
      <EditablePanelTile
        wide={3}
        minHeight={0}
        sx={headerTileSx}
        value={{ name: articleData.name ?? '' }}
        onSave={handleSaveName}
        isDirty={nameDraftDirty}
        canSave={nameDraftValid}
        renderDisplay={({ name }) => (
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              minHeight: { xs: 0, sm: 200 },
              pr: 4,
            }}
          >
            <Typography variant="h6" sx={{ fontWeight: 700, lineHeight: 1.25 }}>
              {name}
            </Typography>
          </Box>
        )}
        renderEdit={(draft, onChange, inputRef) => (
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              minHeight: { xs: 0, sm: 200 },
            }}
          >
            <TextField
              inputRef={inputRef}
              fullWidth
              variant="standard"
              value={draft.name}
              onChange={(event) => onChange({ name: event.target.value })}
              sx={{
                '& .MuiInput-input': {
                  fontSize: '1.25rem',
                  fontWeight: 700,
                  lineHeight: 1.25,
                },
              }}
            />
          </Box>
        )}
      />

      <PanelTile wide={1} minHeight={0} sx={headerTileSx}>
        <ArticlePhoto />
      </PanelTile>

      <PanelTile wide={1} title="Bestand">
        <PanelValue>
          {articleData.stock != null ? formatStock(articleData.stock) : null}
        </PanelValue>
      </PanelTile>

      <PanelTile wide={1} title="Marke">
        <PanelValue>{articleData.brand}</PanelValue>
      </PanelTile>

      <PanelTile wide={1} title="SKU / EAN">
        <PanelValue label="SKU">{articleData.sku}</PanelValue>
        <PanelValue label="EAN">{articleData.ean}</PanelValue>
      </PanelTile>

      <PanelTile wide={1} title="Preis">
        <PanelValue label="Netto">
          {articleData.net != null ? formatPrice(articleData.net) : null}
        </PanelValue>
        <PanelValue label="MwSt.">
          {articleData.taxRate != null ? `${articleData.taxRate} %` : null}
        </PanelValue>
        <PanelValue label="Brutto">
          {brutto != null ? formatPrice(brutto) : null}
        </PanelValue>
      </PanelTile>

      <PanelTile wide={3} title="SEO & Beschreibung" minHeight={200}>
        <PanelValue label="Slug">{articleData.slug}</PanelValue>
        <PanelValue label="SEO-Titel">{articleData.seoTitle}</PanelValue>
        <PanelValue label="SEO-Beschreibung">{articleData.seoDescription}</PanelValue>
        <PanelValue label="Beschreibung">{articleData.description}</PanelValue>
      </PanelTile>

      <PanelTile wide={1} title="Listen" minHeight={200}>
        <RelationLine
          label="Vaterartikel"
          active={articleData.childCount > 0}
        >
          {articleData.childCount}
        </RelationLine>
        <RelationLine
          label="Kindartikel"
          active={articleData.fatherArticleId != null}
        >
          {articleData.fatherSku ? (
            <Link
              component={RouterLink}
              to={`/artikel/${encodeURIComponent(articleData.fatherSku)}`}
            >
              {articleData.fatherSku}
            </Link>
          ) : null}
        </RelationLine>
        <CountLine label="Optionen" count={articleData.optionsCount} />
        <CountLine label="Stücklisten" count={articleData.articleListCount} />
        <CountLine label="Varianten" count={articleData.childCount} />
      </PanelTile>
    </PanelTileGrid>
  );
}