basic-erp/apps/web/src/app/features/documents/document-form.page.ts

import { HttpErrorResponse, httpResource } from '@angular/common/http';
import { ChangeDetectionStrategy, Component, computed, inject, linkedSignal, signal } from '@angular/core';
import { toSignal } from '@angular/core/rxjs-interop';
import { ActivatedRoute, Router, RouterLink } from '@angular/router';
import type { SlListResponse } from '@basic-erp/sap-types';
import { map } from 'rxjs';
import { API_URL, apiErrorMessage } from '../../core/api';
import { formatNumber } from '../../core/format';
import { SlDocumentApi } from '../../core/sl/sl-document';
import { DateField, LookupField, NumberField, TextField, TextareaField } from '../../shared/form';
import type { GridLine } from '../../shared/grid/grid.types';
import { LinesGrid } from '../../shared/grid/lines-grid';
import type { VhLookup } from '../../shared/value-help/value-help.types';
import { Icon, SboWindow, Toolbar, type StatusMessage, type WindowBadge } from '../../shared/window';
import {
  type DocRecord,
  type NavTarget,
  computeTotals,
  createPayload,
  isBlankLine,
  isDocumentReadOnly,
  taxRateMap,
  updatePayload,
  validateDocument,
} from './document-model';
import { type DocumentScreen, documentStatus } from './document-screens';
import { ITEMS_MULTI_ADD, lineColumnsFor, newDocumentLine, recalcLine } from './line-columns';

/** Campos de cabecera que se editan en el formulario (el resto lo calcula SAP). */
const HEADER_KEYS = ['CardCode', 'NumAtCard', 'DocDate', 'DocDueDate', 'DiscountPercent', 'Comments'] as const;

const today = (): string => new Date().toISOString().slice(0, 10);
/** SAP devuelve las fechas como `2026-01-05T00:00:00Z`; el campo de fecha y el guardado usan `2026-01-05`. */
const dateOnly = (v: unknown): string => (typeof v === 'string' ? v.slice(0, 10) : '');
const pickHeader = (doc: DocRecord | undefined): DocRecord => {
  if (!doc) return { DocDate: today(), DocDueDate: today(), DiscountPercent: 0 };
  return Object.fromEntries(
    HEADER_KEYS.map((k) => [
      k,
      k === 'DocDate' || k === 'DocDueDate' ? dateOnly(doc[k]) : (doc[k] ?? (k === 'DiscountPercent' ? 0 : '')),
    ]),
  );
};
const text = (v: unknown): string => (v === null || v === undefined ? '' : String(v));

/**
 * Formulario de un documento de ventas o compras: `nuevo` (vacío) o `:docEntry` (ver / editar).
 * Los cerrados y cancelados quedan en solo lectura. Al modificar se envía el `odata.etag` leído
 * (`If-Match`): si otro usuario cambió el documento, SAP responde 412 y se avisa sin pisarlo.
 */
@Component({
  selector: 'sbo-document-form-page',
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [DateField, Icon, LinesGrid, LookupField, NumberField, RouterLink, SboWindow, TextField, TextareaField, Toolbar],
  templateUrl: './document-form.page.html',
  styles: `
    h1 { margin: 0 0 6px; font-size: 18px; font-weight: 600; }
    p { margin: 0; color: var(--quiet); }
    a { color: var(--focus); }
    .totals { display: grid; gap: 2px; }
  `,
})
export class DocumentFormPage {
  private readonly route = inject(ActivatedRoute);
  private readonly router = inject(Router);
  private readonly api = inject(SlDocumentApi);

  protected readonly title = this.route.snapshot.data['title'] as string;
  protected readonly screen = this.route.snapshot.data['screen'] as DocumentScreen;
  protected readonly partner = this.screen.partner;
  protected readonly docEntry = toSignal(
    this.route.paramMap.pipe(map((p) => (p.has('docEntry') ? Number(p.get('docEntry')) : null))),
    { initialValue: this.route.snapshot.paramMap.has('docEntry') ? Number(this.route.snapshot.paramMap.get('docEntry')) : null },
  );
  protected readonly isNew = computed(() => this.docEntry() === null);

  // --- datos ---------------------------------------------------------------------------------

  private readonly docResource = httpResource<DocRecord>(() => {
    const id = this.docEntry();
    return id === null ? undefined : `${API_URL}/sl/${this.screen.resource}/${id}`;
  });
  private readonly taxResource = httpResource<SlListResponse<DocRecord>>(() =>
    this.partner
      ? { url: `${API_URL}/sl/${this.partner.taxResource}`, params: { $select: 'Code,Rate', $top: 500 } }
      : undefined,
  );

  protected readonly doc = computed(() => (this.docResource.hasValue() ? this.docResource.value() : undefined));
  protected readonly loading = computed(() => this.docResource.isLoading());
  protected readonly loadError = computed(() => {
    const err = this.docResource.error();
    return err ? (err instanceof HttpErrorResponse && err.status === 404 ? 'El documento no existe.' : apiErrorMessage(err)) : '';
  });

  /** Valores editables; se reinician al cargar o recargar el documento. */
  protected readonly header = linkedSignal<DocRecord>(() => pickHeader(this.doc()));
  protected readonly lines = linkedSignal<readonly GridLine[]>(() =>
    ((this.doc()?.['DocumentLines'] as GridLine[] | undefined) ?? []).map((l) => ({ ...l })),
  );
  protected readonly partnerName = linkedSignal(() => text(this.doc()?.['CardName']));

  // --- estado --------------------------------------------------------------------------------

  protected readonly readOnly = computed(() => isDocumentReadOnly(this.doc()));
  protected readonly saving = signal(false);
  private readonly message = signal<StatusMessage | null>(
    ((): StatusMessage | null => {
      const created = (this.router.currentNavigation()?.extras.state as { created?: string } | undefined)?.created;
      return created ? { kind: 'ok', text: `Documento ${created} creado.` } : null;
    })(),
  );
  protected readonly conflict = signal(false);

  protected readonly status = computed<StatusMessage>(() => {
    if (this.loading()) return { kind: 'info', text: 'Cargando…' };
    if (this.loadError()) return { kind: 'err', text: this.loadError() };
    const message = this.message();
    if (message) return message;
    if (this.readOnly()) return { kind: 'info', text: 'Documento cerrado o cancelado: solo lectura.' };
    if (this.isNew()) return { kind: 'info', text: `Indique el ${this.partner?.label.toLowerCase() ?? 'socio'} y las líneas.` };
    return { kind: 'info', text: this.dirty() ? 'Hay cambios sin guardar.' : '' };
  });
  protected readonly badge = computed<WindowBadge | undefined>(() => {
    if (this.isNew()) return { label: 'Nueva', tone: 'info' };
    const d = this.doc();
    return d ? documentStatus(d) : undefined;
  });
  protected readonly windowTitle = computed(() => {
    const num = this.doc()?.['DocNum'];
    return num === undefined ? this.title : `${this.title} · ${text(num)}`;
  });

  protected readonly dirty = computed(() => {
    const d = this.doc();
    if (!d) return text(this.header()['CardCode']) !== '' || this.lines().some((l) => !isBlankLine(l));
    const original = pickHeader(d);
    const { body } = updatePayload(original, this.header(), (d['DocumentLines'] as GridLine[]) ?? [], this.lines());
    return Object.keys(body).length > 0;
  });

  // --- totales -------------------------------------------------------------------------------

  private readonly rates = computed(() =>
    taxRateMap(this.taxResource.hasValue() ? this.taxResource.value().value : []),
  );
  protected readonly totals = computed(() =>
    computeTotals(this.lines(), this.rates(), Number(this.header()['DiscountPercent'] ?? 0)),
  );
  protected readonly fmt = (n: number): string => formatNumber(n, 2);

  // --- configuración de la vista --------------------------------------------------------------

  protected readonly columns = lineColumnsFor(this.partner?.taxResource ?? 'SalesTaxCodes');
  protected readonly newLine = newDocumentLine;
  protected readonly recalc = recalcLine;
  protected readonly multi = ITEMS_MULTI_ADD;
  protected readonly partnerLookup: VhLookup = {
    title: this.partner?.type === 'cSupplier' ? 'Proveedores' : 'Clientes',
    resource: 'BusinessPartners',
    baseFilter: `CardType eq '${this.partner?.type ?? 'cCustomer'}'`,
    orderby: 'CardCode',
    columns: [
      { key: 'CardCode', title: 'Código', width: '130px', mono: true },
      { key: 'CardName', title: 'Nombre' },
    ],
  };

  protected str = text;

  protected setHeader(key: string, value: unknown): void {
    this.header.update((h) => ({ ...h, [key]: value }));
    this.message.set(null);
  }

  protected onPartner(row: Record<string, unknown>): void {
    this.partnerName.set(text(row['CardName']));
  }

  protected setLines(lines: readonly GridLine[]): void {
    this.lines.set(lines);
    this.message.set(null);
  }

  // --- acciones ------------------------------------------------------------------------------

  protected async go(target: NavTarget): Promise<void> {
    try {
      const entry = await this.api.neighbour(this.screen.resource, target, this.docEntry());
      if (entry === null) {
        this.message.set({ kind: 'warn', text: 'No hay más documentos en esa dirección.' });
        return;
      }
      this.message.set(null);
      await this.router.navigate(['..', entry], { relativeTo: this.route });
    } catch (e) {
      this.message.set({ kind: 'err', text: apiErrorMessage(e) });
    }
  }

  protected async save(): Promise<void> {
    if (this.saving() || this.readOnly()) return;
    const errors = validateDocument(this.header(), this.lines(), this.partner?.label ?? 'Socio de negocio');
    if (errors.length) {
      this.message.set({ kind: 'err', text: errors[0] });
      return;
    }
    this.saving.set(true);
    this.conflict.set(false);
    try {
      const d = this.doc();
      if (!d) {
        const created = await this.api.create(this.screen.resource, createPayload(this.header(), this.lines()));
        await this.router.navigate(['..', created['DocEntry']], {
          relativeTo: this.route,
          state: { created: text(created['DocNum']) },
        });
        return;
      }
      const { body, replaceLines } = updatePayload(
        pickHeader(d),
        this.header(),
        (d['DocumentLines'] as GridLine[]) ?? [],
        this.lines(),
      );
      if (!Object.keys(body).length) {
        this.message.set({ kind: 'info', text: 'No hay cambios que guardar.' });
        return;
      }
      await this.api.update(this.screen.resource, this.docEntry()!, body, text(d['odata.etag']) || undefined, replaceLines);
      this.message.set({ kind: 'ok', text: 'Documento actualizado.' });
      this.docResource.reload();
    } catch (e) {
      if (e instanceof HttpErrorResponse && e.status === 412) {
        this.conflict.set(true);
        this.message.set({
          kind: 'warn',
          text: 'Otro usuario modificó este documento. Recárguelo para ver sus cambios; los suyos no se guardaron.',
        });
      } else {
        this.message.set({ kind: 'err', text: apiErrorMessage(e) });
      }
    } finally {
      this.saving.set(false);
    }
  }

  protected reload(): void {
    this.conflict.set(false);
    this.message.set(null);
    this.docResource.reload();
  }
}