import {
  delivery as deliveryApi,
  quote as quoteApi,
  order as orderApi,
  retoure as retoureApi,
} from '../../api';
import entityAutomat from '../../automats/entityAutomat';
import deliveryAutomat from '../../automats/deliveryAutomat';
import quoteAutomat from '../../automats/quoteAutomat';
import orderAutomat from '../../automats/orderAutomat';
import retoureAutomat from '../../automats/retoureAutomat';
import { getArticle } from '../../automats/artikelAutomat';
import companyAutomat, { selectCompanyTaxrate } from '../../automats/companyAutomat';
import { netFromGross } from '../../utils/price';
import { ensureDocumentNumber, getNextDocumentNumber } from '../../utils/documentNumber';
import {
  GREEN_PANEL,
  ORANGE_PANEL,
  PURPLE_PANEL,
  YELLOW_PANEL,
  RED_PANEL,
} from '../../colors';

/** Groups that are not sales customers (filter client-side). */
export const EXCLUDED_CUSTOMER_GROUP_NAMES = new Set(['Lieferanten', 'POS']);

export function isSupplierCustomerGroup(group) {
  return String(group?.name ?? '').trim().toLowerCase() === 'lieferanten';
}

export function entityDisplayName(entity) {
  if (!entity) return '';
  const fullName = [entity.firstName, entity.name].filter(Boolean).join(' ');
  return fullName || entity.name || entity.firstName || (entity.number ? `Kunde ${entity.number}` : (entity.id ? `Kunde #${entity.id}` : ''));
}

export function sortEntities(entities) {
  return [...entities].sort((a, b) => {
    const byName = String(a.name).localeCompare(String(b.name), 'de');
    if (byName !== 0) return byName;
    return String(a.firstName ?? '').localeCompare(String(b.firstName ?? ''), 'de');
  });
}

/**
 * Customers = entities whose customergroup is not Lieferanten.
 */
export function filterNonSupplierEntities(entities, groups) {
  const supplierIds = new Set(
    (groups || [])
      .filter(isSupplierCustomerGroup)
      .map((g) => g.id),
  );
  return sortEntities(
    (entities || []).filter((e) => !supplierIds.has(e.customergroupId)),
  );
}

/**
 * Returns the customer group with the lowest sort number that is not Lieferanten.
 */
export function getLowestSortNonSupplierCustomerGroup(groups) {
  const nonSuppliers = (groups || []).filter((g) => !isSupplierCustomerGroup(g));
  if (nonSuppliers.length === 0) return null;
  return [...nonSuppliers].sort(
    (a, b) => (Number(a.sort) || 0) - (Number(b.sort) || 0),
  )[0];
}

/**
 * Customers = entities whose customergroup.name is not Lieferanten/POS.
 */
export function filterCustomerEntities(entities, groups) {
  const excludedIds = new Set(
    groups
      .filter((g) => EXCLUDED_CUSTOMER_GROUP_NAMES.has(g.name))
      .map((g) => g.id),
  );
  return sortEntities(
    entities.filter((e) => !excludedIds.has(e.customergroupId)),
  );
}

export function sortSuppliers(suppliers) {
  return [...suppliers].sort((a, b) =>
    String(a.name).localeCompare(String(b.name), 'de'),
  );
}

export function sortDocs(docs) {
  return [...docs].sort((a, b) => String(b.date).localeCompare(String(a.date)));
}

export function formatDate(iso) {
  const d = new Date(iso);
  if (Number.isNaN(d.getTime())) return iso;
  return d.toLocaleDateString('de-DE');
}

export function formatDateTime(iso) {
  if (!iso) return '–';
  const d = new Date(iso);
  if (Number.isNaN(d.getTime())) return String(iso);
  return d.toLocaleString('de-DE', {
    day: '2-digit',
    month: '2-digit',
    year: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
  });
}

/**
 * Delivery documents have a server-allocated, read-only `number` plus an
 * optional user-entered `externalNumber`. Returns the display value for a
 * field, defaulting to a dash when empty.
 */
export function numberDisplay(value) {
  if (value == null || String(value).trim() === '') return '–';
  return String(value);
}

export function todayInputValue() {
  const d = new Date();
  const year = d.getFullYear();
  const month = String(d.getMonth() + 1).padStart(2, '0');
  const day = String(d.getDate()).padStart(2, '0');
  return `${year}-${month}-${day}`;
}

export function dateInputValue(iso) {
  if (!iso) return '';
  const d = new Date(iso);
  if (Number.isNaN(d.getTime())) return String(iso).slice(0, 10);
  return d.toISOString().slice(0, 10);
}

export function emptyLine() {
  const normTax = selectCompanyTaxrate() != null ? String(selectCompanyTaxrate()) : '19';
  return {
    key: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
    amount: '1',
    sku: '',
    name: '',
    tax: normTax,
    taxrate: normTax,
    rebate: '0',
    net: '',
    gross: '',
    pu: '1',
    unit: '',
    netprice: '',
    shippable: true,
  };
}

export function lineFromApi(row) {
  const netVal = row.netprice != null ? String(row.netprice) : row.net != null ? String(row.net) : '';
  const taxVal = row.taxrate != null ? String(row.taxrate) : row.tax != null ? String(row.tax) : '';
  const netNum = parseNum(netVal);
  const taxNum = parseNum(taxVal);
  const rebateNum = parseNum(row.rebate) ?? 0;
  let grossVal = '';
  if (row.gross != null && row.gross !== '') {
    grossVal = String(row.gross);
  } else if (netNum != null) {
    const rate = taxNum ?? 0;
    const g = Math.round((netNum * (1 + rate / 100) * (1 - rebateNum / 100) + Number.EPSILON) * 100) / 100;
    grossVal = String(g);
  }
  return {
    id: row.id,
    key: `line-${row.id ?? `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`}`,
    amount: row.amount == null ? '' : String(row.amount),
    sku: row.sku ?? '',
    tax: taxVal,
    rebate: row.rebate == null ? '' : String(row.rebate),
    net: netVal,
    gross: grossVal,
    name: row.name ?? '',
    pu: row.pu == null ? '' : String(row.pu),
    unit: row.unit ?? '',
    netprice: netVal,
    taxrate: taxVal,
    shippable: row.shippable !== undefined ? Boolean(row.shippable) : true,
  };
}

export function parseNum(value) {
  if (value == null || value === '') return null;
  const cleaned = String(value).trim().replace('%', '').trim().replace(',', '.');
  if (cleaned === '') return null;
  const n = Number(cleaned);
  return Number.isFinite(n) ? n : null;
}

export function getFirstVal(...vals) {
  for (const v of vals) {
    if (v != null && String(v).trim() !== '') return v;
  }
  return null;
}

export function hasArticleLines(lines) {
  if (!Array.isArray(lines) || lines.length === 0) return false;
  return lines.some((l) => {
    if (!l) return false;
    const sku = String(l.sku ?? '').trim();
    const name = String(l.name ?? '').trim();
    const net = String(l.net ?? l.netprice ?? l.gross ?? '').trim();
    return Boolean(sku || name || net);
  });
}

/** Build create/update line array. Throws Error on client validation. */
export function buildLines(lines, { requireAtLeastOne, kind } = {}) {
  const outLines = [];
  const errors = [];

  for (let i = 0; i < lines.length; i++) {
    const line = lines[i];
    const sku = String(line.sku ?? '').trim();
    const name = String(line.name ?? (sku ? getArticle(sku)?.name : '') ?? '').trim();
    const rawAmount = getFirstVal(line.amount, line.count);
    const amount = parseNum(rawAmount);
    const rawNet = getFirstVal(line.net, line.netprice, line.netPrice, line.eknetto);
    let net = parseNum(rawNet);
    const rawTax = getFirstVal(line.tax, line.taxrate, line.taxRate, line.mwst);
    const tax = parseNum(rawTax);
    const rawGross = getFirstVal(line.gross);
    const gross = parseNum(rawGross);
    const rebate = parseNum(getFirstVal(line.rebate));
    if (net == null && gross != null && tax != null) {
      net = netFromGross(gross, tax, rebate ?? 0);
    }
    const rawPu = getFirstVal(line.pu, line.vpe);
    const pu = parseNum(rawPu);
    const blank = !sku && !name && net == null && gross == null;
    if (blank) continue;

    const missing = [];
    if (!sku && !name) {
      missing.push('Artikel (ArtNr oder Name)');
    }
    if (amount == null) {
      missing.push(rawAmount != null ? 'gültige Menge' : 'Menge');
    }
    if ('pu' in line && pu == null) {
      missing.push(rawPu != null ? 'gültige VPE' : 'VPE');
    }
    if (net == null) {
      missing.push(rawNet != null ? 'gültiger Nettopreis' : 'Nettopreis');
    }
    if (tax == null) {
      missing.push(rawTax != null ? 'gültiger Steuersatz' : 'Steuersatz');
    }

    if (missing.length > 0) {
      const identifier = name || sku;
      const rowLabel = `Zeile ${i + 1}${identifier ? ` („${identifier}“)` : ''}`;
      const fieldsText =
        missing.length === 1
          ? `${missing[0]} fehlt`
          : `${missing.slice(0, -1).join(', ')} und ${missing[missing.length - 1]} fehlen`;
      errors.push(`${rowLabel}: ${fieldsText}.`);
      continue;
    }

    const row = { amount, net, taxrate: tax };
    if (sku) row.sku = sku;
    if (name) row.name = name;
    if (rebate != null) row.rebate = rebate;
    if (pu != null) row.pu = pu;
    if (kind !== 'delivery') {
      row.shippable = line.shippable !== undefined ? Boolean(line.shippable) : true;
    }
    outLines.push(row);
  }

  if (errors.length > 0) {
    if (errors.length <= 3) {
      throw new Error(errors.join(' '));
    }
    const visibleErrors = errors.slice(0, 3).join(' ');
    const remainingCount = errors.length - 3;
    throw new Error(
      `${visibleErrors} (und ${remainingCount} weitere fehlerhafte Zeile${remainingCount === 1 ? '' : 'n'})`,
    );
  }

  if (requireAtLeastOne && outLines.length === 0) {
    throw new Error('Mindestens eine Artikelzeile nötig.');
  }
  return outLines;
}

/**
 * Convert File objects to base64 for API upload
 * @param {Array<{file: File, name: string, type: string, thumbnail?: string, text?: string, parentPdfId?: string|number, isPersisted?: boolean, isDirty?: boolean}>} attachments
 * @param {{ onlyNew?: boolean }} [options]
 * @returns {Promise<Array<{mimetype: string, name: string, content: string, thumbavif?: string, meta?: object}>>}
 */
export async function buildFilesForUpload(attachments = [], { onlyNew = false } = {}) {
  const files = [];
  for (const attachment of attachments) {
    if (!attachment) continue;
    // Skip already persisted attachments in update mode unless modified
    if (onlyNew && attachment.isPersisted && !attachment.isDirty) {
      continue;
    }
    if (attachment.isPersisted && !attachment.isDirty && (!attachment.file || attachment.file.size === 0)) {
      continue;
    }

    let fileToUpload = attachment.file;
    if (!fileToUpload || fileToUpload.size === 0) {
      if (attachment.text) {
        fileToUpload = new File([attachment.text], attachment.name || 'file.txt', {
          type: 'text/plain;charset=utf-8',
        });
      } else {
        continue;
      }
    }

    try {
      const base64 = await fileToBase64(fileToUpload);
      const filePayload = {
        mimetype: attachment.type || fileToUpload.type,
        name: attachment.name || fileToUpload.name,
        content: base64,
      };

      if (attachment.thumbnail) {
        const thumbBase64 = attachment.thumbnail.includes(',')
          ? attachment.thumbnail.split(',')[1]
          : attachment.thumbnail;
        filePayload.thumbavif = thumbBase64;
      }

      files.push(filePayload);
    } catch (err) {
      console.error('Fehler beim Konvertieren von Datei zu Base64:', err);
    }
  }
  return files;
}

/**
 * Convert File to base64 string
 * @param {File} file
 * @returns {Promise<string>}
 */
function fileToBase64(file) {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onload = () => {
      const result = reader.result;
      if (typeof result === 'string') {
        // Remove data URL prefix (e.g., "data:application/pdf;base64,")
        const base64 = result.split(',')[1] || result;
        resolve(base64);
      } else {
        reject(new Error('Invalid file reader result'));
      }
    };
    reader.onerror = () => reject(new Error('File reader error'));
    reader.readAsDataURL(file);
  });
}

/**
 * Restore attachments from API response
 * @param {Array<{id: number, fileId?: number, manifestId?: number, mimetype: string, name: string, thumbavif?: any, size: number, created?: string, meta?: object}>} apiFiles
 * @param {Array<object>} [existingAttachments]
 * @returns {Promise<Array<{id: number, fileId: number, manifestId: number, file: File, name: string, type: string, thumbnail: string|null, size: number, text: string|null, parentPdfId: string|null, isPersisted: boolean}>>}
 */
export async function restoreAttachmentsFromApi(apiFiles = [], existingAttachments = []) {
  const existingMap = new Map();
  for (const existing of existingAttachments) {
    if (!existing) continue;
    if (existing.id != null) existingMap.set(String(existing.id), existing);
    if (existing.fileId != null) existingMap.set(String(existing.fileId), existing);
    if (existing.name) existingMap.set(existing.name, existing);
  }

  const attachments = [];
  for (const apiFile of apiFiles) {
    try {
      let file = null;
      let thumbnail = null;

      // 1. Try to restore thumbnail from apiFile.thumbavif
      if (apiFile.thumbavif) {
        try {
          if (typeof apiFile.thumbavif === 'string') {
            thumbnail = apiFile.thumbavif.startsWith('data:')
              ? apiFile.thumbavif
              : `data:image/avif;base64,${apiFile.thumbavif}`;
          } else if (typeof apiFile.thumbavif === 'object') {
            const rawBytes = apiFile.thumbavif.data || apiFile.thumbavif;
            if (Array.isArray(rawBytes) || rawBytes instanceof Uint8Array) {
              const thumbBlob = new Blob([new Uint8Array(rawBytes)], { type: 'image/avif' });
              thumbnail = URL.createObjectURL(thumbBlob);
            }
          }
        } catch (thumbErr) {
          console.error('Fehler beim Dekodieren von thumbavif:', thumbErr);
        }
      }

      // 2. Fallback to existing matching attachment thumbnail
      const matchingExisting =
        existingMap.get(String(apiFile.id)) ||
        existingMap.get(String(apiFile.fileId)) ||
        existingMap.get(apiFile.name);

      if (!thumbnail && matchingExisting?.thumbnail) {
        thumbnail = matchingExisting.thumbnail;
      }

      const placeholderName = apiFile.name || 'file';
      const placeholderType = apiFile.mimetype || 'application/octet-stream';
      file =
        matchingExisting?.file instanceof File && matchingExisting.file.size > 0
          ? matchingExisting.file
          : new File([''], placeholderName, { type: placeholderType });

      const text = matchingExisting?.text || null;
      const parentPdfId = matchingExisting?.parentPdfId || null;

      attachments.push({
        id: apiFile.id,
        fileId: apiFile.fileId ?? apiFile.id,
        manifestId: apiFile.manifestId,
        isPersisted: true,
        file,
        name: apiFile.name,
        type: apiFile.mimetype,
        thumbnail,
        size: apiFile.size,
        text,
        parentPdfId,
        uploadedAt: apiFile.created,
        meta: apiFile.meta || matchingExisting?.meta || null,
      });
    } catch (err) {
      console.error('Fehler beim Wiederherstellen von Datei:', err);
    }
  }
  return attachments;
}

/**
 * Collect new or modified attachments for multipart upload
 * @param {Array<{file: File, name: string, type: string, thumbnail?: string, text?: string, parentPdfId?: string|number, isPersisted?: boolean, isDirty?: boolean}>} attachments
 * @param {{ onlyNew?: boolean }} [options]
 * @returns {Array<{file: File, name: string, mimetype: string, meta?: object}>}
 */
export function collectFilesForUpload(attachments = [], { onlyNew = false } = {}) {
  const files = [];
  for (const attachment of attachments) {
    if (!attachment) continue;
    // Skip already persisted attachments in update mode unless modified
    if (onlyNew && attachment.isPersisted && !attachment.isDirty) {
      continue;
    }
    if (attachment.isPersisted && !attachment.isDirty && (!attachment.file || attachment.file.size === 0)) {
      continue;
    }

    let fileToUpload = attachment.file;
    if (!fileToUpload || fileToUpload.size === 0) {
      if (attachment.text) {
        fileToUpload = new File([attachment.text], attachment.name || 'file.txt', {
          type: 'text/plain;charset=utf-8',
        });
      } else {
        continue;
      }
    }

    let thumbavif = null;
    if (attachment.thumbnail) {
      thumbavif = attachment.thumbnail.includes(',')
        ? attachment.thumbnail.split(',')[1]
        : attachment.thumbnail;
    }

    files.push({
      file: fileToUpload,
      name: attachment.name || fileToUpload.name,
      mimetype: attachment.type || fileToUpload.type,
      thumbavif,
    });
  }
  return files;
}

/**
 * @param {{ number: string, externalNumber?: string, date: string, partyId: number|null, lines: object[], attachments?: object[] }} form
 * @param {{ partyField: 'supplierId'|'entityId', requireAtLeastOne: boolean, externalNumber?: boolean }} opts
 */
export async function buildManifestBody(
  form,
  { partyField, requireAtLeastOne, externalNumber: useExternalNumber, kind, isUpdate, mode, omitLines },
) {
  const date = form.date;
  if (!date) throw new Error('Datum fehlt.');

  const externalNumber = String(form.externalNumber ?? '').trim();
  const isEdit = isUpdate != null ? Boolean(isUpdate) : (mode === 'edit' || !requireAtLeastOne);
  const shouldRequireLine = requireAtLeastOne !== false;
  const shouldIncludeLines = !omitLines && form.lines !== undefined && form.lines !== null;

  let body;
  if (kind === 'delivery') {
    // Delivery: number is server-allocated/read-only. The caller-supplied
    // reference goes in externalNumber (nullable; empty string → null).
    body = {
      externalNumber: externalNumber || null,
      date,
    };
    if (shouldIncludeLines) {
      body.lines = buildLines(form.lines, { requireAtLeastOne: shouldRequireLine, kind: 'delivery' });
    }
  } else {
    let number = String(form.number ?? '').trim();
    if (!number) {
      number = await ensureDocumentNumber(kind || (partyField === 'entityId' ? 'quote' : 'doc'));
    }
    if (!number) throw new Error('Nummer konnte nicht ermittelt werden.');
    body = {
      number,
      date,
    };
    if (shouldIncludeLines) {
      body.lines = buildLines(form.lines, { requireAtLeastOne: shouldRequireLine, kind });
    }
    if (useExternalNumber || form.externalNumber != null) {
      body.externalNumber = externalNumber || null;
    }
  }
  if (form.partyId != null && form.partyId !== '') {
    const pid = Number(form.partyId);
    if (!Number.isNaN(pid)) {
      body[partyField] = pid;
    }
  } else if (kind === 'order') {
    throw new Error('Für eine Bestellung ist ein Kunde erforderlich.');
  } else if (isEdit) {
    body[partyField] = null;
  }

  // Add files if attachments exist
  if (form.attachments && form.attachments.length > 0) {
    const filesToUpload = collectFilesForUpload(form.attachments, { onlyNew: isEdit });
    if (filesToUpload.length > 0) {
      const formData = new FormData();
      body.filesMeta = filesToUpload.map((item) => ({
        name: item.name,
        thumbavif: item.thumbavif ?? null,
      }));
      formData.append('data', JSON.stringify(body));
      for (const item of filesToUpload) {
        formData.append('files', item.file, item.name);
      }
      return formData;
    }
  }

  return body;
}

export const LINE_COLUMNS = [
  { id: 'pos', label: 'Pos', width: 44, align: 'center' },
  { id: 'amount', label: 'Anzahl', width: 80, align: 'right', type: 'number' },
  { id: 'sku', label: 'ArtNr', width: 130, align: 'left', type: 'text' },
  { id: 'name', label: 'Name', width: 200, align: 'left', type: 'text' },
  { id: 'tax', label: 'MwSt', width: 70, align: 'right', type: 'number' },
  { id: 'rebate', label: 'Rabatt', width: 75, align: 'right', type: 'number' },
  { id: 'net', label: 'Netto', width: 95, align: 'right', type: 'number' },
  { id: 'gross', label: 'Brutto', width: 95, align: 'right', type: 'number' },
];

export const QUOTE_LINE_COLUMNS = [
  { id: 'pos', label: 'Pos', width: 44, align: 'center' },
  { id: 'amount', label: 'Anzahl', width: 80, align: 'right', type: 'number' },
  { id: 'sku', label: 'ArtNr', width: 130, align: 'left', type: 'text' },
  { id: 'name', label: 'Name', width: 200, align: 'left', type: 'text' },
  { id: 'shippable', label: 'Lieferbar', width: 68, align: 'center', type: 'boolean' },
  { id: 'tax', label: 'MwSt', width: 70, align: 'right', type: 'number' },
  { id: 'rebate', label: 'Rabatt', width: 75, align: 'right', type: 'number' },
  { id: 'net', label: 'Netto', width: 95, align: 'right', type: 'number' },
  { id: 'gross', label: 'Brutto', width: 95, align: 'right', type: 'number' },
];

export const ORDER_LINE_COLUMNS = [
  { id: 'pos', label: 'Pos', width: 44, align: 'center' },
  { id: 'sku', label: 'ArtNr', width: 130, align: 'left', type: 'text' },
  { id: 'name', label: 'Name', width: 200, align: 'left', type: 'text' },
  { id: 'amount', label: 'Anzahl', width: 80, align: 'right', type: 'number' },
  { id: 'shippable', label: 'Lieferbar', width: 68, align: 'center', type: 'boolean' },
  { id: 'tax', label: 'MwSt', width: 70, align: 'right', type: 'number' },
  { id: 'rebate', label: 'Rabatt', width: 75, align: 'right', type: 'number' },
  { id: 'net', label: 'Netto', width: 95, align: 'right', type: 'number' },
  { id: 'gross', label: 'Brutto', width: 95, align: 'right', type: 'number' },
];

export const DELIVERY_LINE_COLUMNS = [
  { id: 'pos', label: 'Pos', width: 44, align: 'center' },
  { id: 'sku', label: 'ArtNr', width: 130, align: 'left', type: 'text' },
  { id: 'name', label: 'Name', width: 220, align: 'left', type: 'text' },
  { id: 'amount', label: 'Anzahl', width: 88, align: 'right', type: 'number' },
  { id: 'pu', label: 'VPE', width: 80, align: 'right', type: 'number' },
  { id: 'taxrate', label: 'MwSt', width: 80, align: 'right', type: 'number' },
  { id: 'netprice', label: 'Netto', width: 104, align: 'right', type: 'number' },
];

/** @typedef {'delivery'|'quote'|'order'} ManifestKind */

/**
 * Resolves the api namespace for a manifest kind.
 *
 * Delivery, quote, and order share one editor/list shape but talk to three
 * different endpoints.
 *
 * @param {ManifestKind} kind Manifest kind.
 * @returns {{get: Function, create: Function, update: Function, delete: Function}}
 */
export function apiFor(cfgOrKind) {
  const kind = typeof cfgOrKind === 'string' ? cfgOrKind : cfgOrKind?.kind;
  if (kind === 'delivery') return deliveryApi;
  if (kind === 'quote') return quoteApi;
  if (kind === 'order') return orderApi;
  if (kind === 'retoure') return retoureApi;
  throw new Error(`Unknown manifest kind: ${kind}`);
}

/**
 * Load party options for Autocomplete / list name lookup.
 * @param {ManifestKind|object} cfgOrKind
 */
export async function loadParties(cfgOrKind) {
  const kind = typeof cfgOrKind === 'string' ? cfgOrKind : cfgOrKind?.kind;
  if (kind === 'delivery') {
    if (companyAutomat.state.suppliersStatus === 'ready') {
      return sortSuppliers(companyAutomat.state.suppliers);
    }
    const list = await companyAutomat.actions.loadSuppliers();
    return sortSuppliers(list);
  }
  const [entities, groups] = await Promise.all([
    entityAutomat.actions.ensureLoaded(),
    companyAutomat.actions.ensureCustomergroupsLoaded(),
  ]);
  const entityList = entities ?? entityAutomat.state.items ?? [];
  const groupList = groups ?? companyAutomat.state.customergroups ?? [];
  return filterNonSupplierEntities(entityList, groupList);
}

export function partyDisplayName(cfgOrKind, party) {
  if (!party) return '';
  if (typeof party === 'string') return party;
  const kind = typeof cfgOrKind === 'string' ? cfgOrKind : cfgOrKind?.kind;
  if (kind === 'delivery') return String(party.name ?? '');
  return entityDisplayName(party);
}

/**
 * @param {ManifestKind|object} cfgOrKind
 */
export function manifestConfig(cfgOrKind) {
  if (cfgOrKind && typeof cfgOrKind === 'object' && cfgOrKind.kind && cfgOrKind.api) {
    return cfgOrKind;
  }
  const kind = typeof cfgOrKind === 'string' ? cfgOrKind : cfgOrKind?.kind;
  if (kind === 'delivery') {
    return {
      kind: 'delivery',
      api: 'delivery',
      listField: 'deliveries',
      docField: 'delivery',
      partyField: 'supplierId',
      listPath: '/lieferung',
      createPath: '/lieferung/neu',
      editPath: (id) => `/lieferung/${id}`,
      dateLabel: 'Lieferdatum',
      partyLabel: 'Lieferant',
      emptyList: 'Noch keine Lieferungen.',
      createButton: 'Neue Lieferung',
      createdMsg: 'Lieferung angelegt.',
      savedMsg: 'Lieferung gespeichert.',
      deletedMsg: 'Lieferung gelöscht.',
      confirmDelete: (number) => `Lieferung „${number}“ wirklich löschen?`,
      invalidId: 'Ungültige Lieferungs-ID.',
      partyGateMessage: null,
      getPathLabel: 'GET /api/delivery/:id',
      postPathLabel: 'POST /api/delivery',
      patchPathLabel: 'PATCH /api/delivery/:id',
      listColor: ORANGE_PANEL,
      headerColor: ORANGE_PANEL,
      linesColor: GREEN_PANEL,
      requirePartyBeforeLines: false,
      listAutomat: deliveryAutomat,
      partiesByIdFromList: (parties) =>
        Object.fromEntries(parties.map((row) => [row.id, row])),
      // Delivery uses a server-allocated read-only number plus an optional
      // caller-supplied external reference.
      externalNumber: true,
      columns: DELIVERY_LINE_COLUMNS,
    };
  }
  if (kind === 'quote') {
    return {
      kind: 'quote',
      api: 'quote',
      listField: 'quotes',
      docField: 'quote',
      partyField: 'entityId',
      listPath: '/auftrag/angebot',
      createPath: '/auftrag/neuesangebot',
      editPath: (id) => `/auftrag/${id}`,
      dateLabel: 'Gültig bis',
      partyLabel: 'Kunde',
      emptyList: 'Noch keine Angebote.',
      createButton: 'Neues Angebot',
      createdMsg: 'Angebot angelegt.',
      savedMsg: 'Angebot gespeichert.',
      deletedMsg: 'Angebot gelöscht.',
      confirmDelete: (number) => `Angebot „${number}“ wirklich löschen?`,
      invalidId: 'Ungültige Angebots-ID.',
      partyGateMessage: null,
      getPathLabel: 'GET /api/quote/:id',
      postPathLabel: 'POST /api/quote',
      patchPathLabel: 'PATCH /api/quote/:id',
      listColor: YELLOW_PANEL,
      headerColor: YELLOW_PANEL,
      linesColor: GREEN_PANEL,
      requirePartyBeforeLines: false,
      listAutomat: quoteAutomat,
      partiesByIdFromList: (parties) =>
        Object.fromEntries(parties.map((row) => [row.id, row])),
      columns: QUOTE_LINE_COLUMNS,
    };
  }
  if (kind === 'order') {
    return {
      kind: 'order',
      api: 'order',
      listField: 'orders',
      docField: 'order',
      partyField: 'entityId',
      listPath: '/auftrag',
      createPath: '/auftrag/bestellung/neu',
      editPath: (id) => `/auftrag/bestellung/${id}`,
      dateLabel: 'Lieferdatum',
      partyLabel: 'Kunde',
      emptyList: 'Noch keine Bestellungen.',
      createButton: 'Neuer Auftrag',
      createdMsg: 'Bestellung angelegt.',
      savedMsg: 'Bestellung gespeichert.',
      deletedMsg: 'Bestellung gelöscht.',
      confirmDelete: (number) => `Bestellung „${number}“ wirklich löschen?`,
      invalidId: 'Ungültige Bestellungs-ID.',
      partyGateMessage: null,
      getPathLabel: 'GET /api/order/:id',
      postPathLabel: 'POST /api/order',
      patchPathLabel: 'PATCH /api/order/:id',
      listColor: PURPLE_PANEL,
      headerColor: PURPLE_PANEL,
      linesColor: GREEN_PANEL,
      requirePartyBeforeLines: false,
      listAutomat: orderAutomat,
      partiesByIdFromList: (parties) =>
        Object.fromEntries(parties.map((row) => [row.id, row])),
      externalNumber: true,
      columns: ORDER_LINE_COLUMNS,
    };
  }
  if (kind === 'retoure') {
    return {
      kind: 'retoure',
      api: 'retoure',
      listField: 'retoures',
      docField: 'retoure',
      partyField: 'entityId',
      listPath: '/auftrag/retoure',
      createPath: '/auftrag/retoure/neu',
      editPath: (id) => `/auftrag/retoure/${id}`,
      dateLabel: 'Retourendatum',
      partyLabel: 'Kunde',
      emptyList: 'Noch keine Retouren.',
      createButton: 'Neue Retoure',
      createdMsg: 'Retoure angelegt.',
      savedMsg: 'Retoure gespeichert.',
      deletedMsg: 'Retoure gelöscht.',
      confirmDelete: (number) => `Retoure „${number}“ wirklich löschen?`,
      invalidId: 'Ungültige Retouren-ID.',
      partyGateMessage: null,
      getPathLabel: 'GET /api/retoure/:id',
      postPathLabel: 'POST /api/retoure',
      patchPathLabel: 'PUT /api/retoure/:id',
      listColor: RED_PANEL,
      headerColor: RED_PANEL,
      linesColor: GREEN_PANEL,
      requirePartyBeforeLines: false,
      listAutomat: retoureAutomat,
      partiesByIdFromList: (parties) =>
        Object.fromEntries(parties.map((row) => [row.id, row])),
      externalNumber: true,
      columns: ORDER_LINE_COLUMNS,
    };
  }
  throw new Error(`Unknown manifest kind: ${kind}`);
}

/**
 * Resolves supplier SKU and own SKU for a manifest line.
 */
export function resolveLineSkus(line, delivery, supplierArticlesMap = {}) {
  const rawSku = line?.sku ? String(line.sku).trim() : '';
  const supplierId = delivery?.supplierId ?? delivery?.partyId;

  // 1. Direct line properties if available
  let supplierSku =
    line?.supplierSku ||
    line?.supplier_sku ||
    line?.supplierArticle?.sku ||
    '';
  let ownSku =
    line?.articleSku ||
    line?.article_sku ||
    line?.article?.sku ||
    line?.supplierArticle?.article?.sku ||
    '';

  // 2. Check supplierArticlesMap
  const sa = rawSku
    ? (supplierArticlesMap[rawSku] || supplierArticlesMap[rawSku.toLowerCase()])
    : null;

  if (sa) {
    if (!supplierSku && sa.sku) supplierSku = sa.sku;
    if (!ownSku && sa.article?.sku) ownSku = sa.article.sku;
  }

  // 3. Check loaded article details
  const cachedArticle =
    line?.article ||
    (ownSku ? getArticle(ownSku) : null) ||
    (rawSku ? getArticle(rawSku) : null);

  if (cachedArticle) {
    if (!ownSku && cachedArticle.sku) {
      ownSku = cachedArticle.sku;
    }
    const sup =
      (supplierId && cachedArticle.suppliers?.find((s) => s.entityId === supplierId)) ||
      cachedArticle.suppliers?.[0];
    if (!supplierSku && sup?.sku) {
      supplierSku = sup.sku;
    }
  }

  // 4. Fallback heuristics if one is still missing
  if (!supplierSku && !ownSku) {
    ownSku = rawSku;
  } else if (!supplierSku && rawSku && rawSku !== ownSku) {
    supplierSku = rawSku;
  } else if (!ownSku && rawSku && rawSku !== supplierSku) {
    ownSku = rawSku;
  }

  return {
    supplierSku: supplierSku || '–',
    ownSku: ownSku || '–',
  };
}