import { ChangeDetectionStrategy, Component, computed, inject, resource, signal } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { apiErrorMessage } from '../../../core/api';
import { FieldNames } from '../../../core/field-names';
import { todayIso } from '../../../core/format';
import { DateField, LookupField, SelectField, TextField, TextareaField } from '../../../shared/form';
import type { VhLookup } from '../../../shared/value-help/value-help.types';
import { SboWindow, type StatusMessage } from '../../../shared/window';
import { WAREHOUSE_LOOKUP } from '../../documents/document-layouts';
import { LOT_FLOWS, type LotFlow, MOTIVO_MAX, TEXT_MAX } from './lotes-flujo.config';
import {
  type LotStockRow,
  type TransferForm,
  clampQuantity,
  initialForm,
  quantityError,
  rowKey,
  transferErrors,
  transferPayload,
} from './lotes-flujo';
import { LotesFlujoApi } from './lotes-flujo-api';

const WAREHOUSE: VhLookup = { ...WAREHOUSE_LOOKUP, nameKey: 'WarehouseName' };

/**
 * «Inmovilizar lotes» y «Liberar lotes» (TAGUMEDICA): se busca un lote por su número, se marcan los almacenes con stock y
 * las cantidades, y se crea la solicitud de traslado en SAP con una línea por almacén de origen y el lote en cada una. La
 * pantalla es la misma; el flujo (`data.flow`) fija el almacén de origen y de destino por defecto y qué textos son obligatorios.
 */
@Component({
  selector: 'sbo-lote-transfer-page',
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [DateField, LookupField, SboWindow, SelectField, TextField, TextareaField],
  template: `
    <sbo-window [title]="config.title" [status]="status()">
      <p class="hint">{{ config.description }}</p>

      <div class="sbo-hdr">
        <div class="sbo-col">
          <sbo-text-field label="Número de lote" dbName="BatchNumber" [value]="lot()" (valueChange)="lot.set($event)" (keydown.enter)="search()" />
        </div>
        <div class="sbo-col">
          @if (config.pickFrom) {
            <sbo-lookup-field label="Almacén de origen" dbName="FromWarehouseCode" [lookup]="warehouse" [value]="fromWarehouse()" (valueChange)="fromWarehouse.set($event)" resolveOnLeave />
          }
        </div>
      </div>
      <p class="row"><button type="button" class="btn main" [disabled]="searching() || !lot().trim()" (click)="search()">Buscar</button></p>

      @if (result(); as r) {
        <h3>Stock del lote {{ r.lot }}</h3>
        <div class="wrap">
          <table class="stock">
            <thead>
              <tr>
                <th class="chk"></th><th [attr.title]="'ItemCode'">Artículo@if (names.show()) {<span class="db">ItemCode</span>}</th><th [attr.title]="'ItemDescription'">Descripción@if (names.show()) {<span class="db">ItemDescription</span>}</th><th [attr.title]="'WarehouseCode'">Almacén@if (names.show()) {<span class="db">WarehouseCode</span>}</th><th [attr.title]="'WarehouseName'">Nombre@if (names.show()) {<span class="db">WarehouseName</span>}</th>
                <th class="num" [attr.title]="'Quantity'">En stock@if (names.show()) {<span class="db">Quantity</span>}</th><th class="num" [attr.title]="'CommitQty'">Comprometido@if (names.show()) {<span class="db">CommitQty</span>}</th><th class="num">Cantidad a mover</th>
              </tr>
            </thead>
            <tbody>
              @for (row of visibleRows(); track key(row)) {
                <tr [class.locked]="isLocked(row)">
                  <td class="chk"><input type="checkbox" [checked]="isSelected(row)" [disabled]="isLocked(row)" [attr.aria-label]="'Mover ' + row.ItemCode + ' del almacén ' + row.WarehouseCode" (change)="toggle(row)" /></td>
                  <td class="code">{{ row.ItemCode }}</td>
                  <td>{{ row.ItemDescription }}</td>
                  <td class="code">{{ row.WarehouseCode }}</td>
                  <td>{{ row.WarehouseName }}</td>
                  <td class="num">{{ row.Quantity }}</td>
                  <td class="num">{{ row.Committed }}</td>
                  <td class="num">
                    @if (isSelected(row)) {
                      <input class="qty" inputmode="decimal" [attr.aria-label]="'Cantidad de ' + row.ItemCode + ' del almacén ' + row.WarehouseCode" [value]="quantities()[key(row)]" (input)="setQuantity(row, $any($event.target))" />
                      @if (qtyError(row); as e) {
                        <span class="err" role="alert">{{ e }}</span>
                      }
                    } @else if (isLocked(row)) {
                      <span class="muted">Ya inmovilizado</span>
                    }
                  </td>
                </tr>
              } @empty {
                <tr class="none"><td colspan="8">El lote no tiene stock en el almacén {{ fromWarehouse() }}.</td></tr>
              }
            </tbody>
          </table>
        </div>

        <h3>Solicitud de traslado</h3>
        <div class="sbo-hdr">
          <div class="sbo-col">
            <sbo-date-field label="Fecha" dbName="DocDate" required [value]="form().docDate" (valueChange)="set({ docDate: $event })" />
            <sbo-select-field label="Serie" dbName="Series" [options]="series.value() ?? []" placeholder="(por defecto)" [value]="form().series" (valueChange)="set({ series: $event === null || $event === '' ? null : +$event })" />
            <sbo-lookup-field label="Almacén destino" dbName="WarehouseCode" required [lookup]="warehouse" [value]="form().toWarehouse" (valueChange)="set({ toWarehouse: $event })" resolveOnLeave />
          </div>
          <div class="sbo-col">
            <sbo-select-field label="Movimiento de inventario" dbName="U_SIS_MOVINV" required [options]="options().movimientoInventario" placeholder="" [value]="form().movimientoInventario" (valueChange)="set({ movimientoInventario: '' + ($event ?? '') })" />
            <sbo-select-field label="Tipo de operación" dbName="U_EXX_TIPOOPER" required [options]="options().tipoOperacion" placeholder="" [value]="form().tipoOperacion" (valueChange)="set({ tipoOperacion: '' + ($event ?? '') })" />
            <sbo-select-field label="Tipo de despacho" dbName="U_SIS_TIPDESP" required [options]="options().tipoDespacho" placeholder="" [value]="form().tipoDespacho" (valueChange)="set({ tipoDespacho: '' + ($event ?? '') })" />
            <sbo-select-field label="Motivo de almacén" dbName="U_SIS_MOTALM" required [options]="options().movimientoAlmacen" placeholder="" [value]="form().movimientoAlmacen" (valueChange)="set({ movimientoAlmacen: '' + ($event ?? '') })" />
          </div>
        </div>
        <sbo-textarea-field label="Motivo del estado" dbName="U_SIS_MOTEST" [rows]="3" required [value]="form().motivo" (valueChange)="set({ motivo: $event })" [error]="over(form().motivo, motivoMax)" />
        <sbo-textarea-field label="Comentario del estado" dbName="U_SIS_COMEST" [rows]="3" [required]="config.requireDetail" [value]="form().comentario" (valueChange)="set({ comentario: $event })" [error]="over(form().comentario, textMax)" />
        <sbo-textarea-field label="Acción a tomar" dbName="U_SIS_ACCTOM" [rows]="3" [required]="config.requireDetail" [value]="form().accion" (valueChange)="set({ accion: $event })" [error]="over(form().accion, textMax)" />

        @if (confirming()) {
          <p class="ask" role="alert">
            ¿Crear la solicitud de traslado de {{ selected().length }} {{ selected().length === 1 ? 'almacén' : 'almacenes' }} del lote {{ r.lot }} al almacén {{ form().toWarehouse }}?
            <button type="button" class="btn main" [disabled]="saving()" (click)="create()">Sí, crear</button>
            <button type="button" class="btn" [disabled]="saving()" (click)="confirming.set(false)">No</button>
          </p>
        }
      }
      @if (result() && !confirming()) {
        <button sboActions class="btn main" type="button" [disabled]="saving() || problems().length > 0" [attr.title]="problems()[0] ?? null" (click)="confirming.set(true)">Generar solicitud de traslado</button>
      }
    </sbo-window>
  `,
  styles: `
    :host { display: block; }
    h3 { margin: 14px 0 4px; font-size: 13px; font-weight: 600; }
    .hint { margin: 0 0 8px; color: var(--quiet); }
    .row { margin: 4px 0 0; }
    .wrap { overflow-x: auto; }
    .stock { width: 100%; border-collapse: collapse; }
    .stock th .db { display: block; font: 10.5px/1.2 var(--mono, monospace); font-weight: 400; color: var(--quiet); }
    .stock th { padding: 4px 8px; background: var(--grid-head); border: 1px solid var(--line); font-size: 12.5px; text-align: left; white-space: nowrap; }
    .stock td { padding: 3px 8px; border: 1px solid var(--line-soft); }
    .stock .num { text-align: right; }
    .stock .chk { width: 28px; text-align: center; }
    .stock .code { font-family: var(--mono, monospace); }
    .stock tr.locked td { background: var(--field-ro); color: var(--quiet); }
    .stock tr.none td { padding: 14px; text-align: center; color: var(--quiet); }
    .qty { width: 90px; text-align: right; }
    .err { display: block; color: var(--err); font-size: 11.5px; }
    .muted { color: var(--quiet); }
    .ask { margin: 12px 0 0; padding: 6px 10px; background: var(--warn-bg, var(--panel)); border: 1px solid var(--line); display: flex; align-items: center; gap: 8px; }
  `,
})
export class LoteTransferPage {
  private readonly api = inject(LotesFlujoApi);
  protected readonly names = inject(FieldNames);
  private readonly flow = inject(ActivatedRoute).snapshot.data['flow'] as LotFlow;

  protected readonly config = LOT_FLOWS[this.flow];
  protected readonly warehouse = WAREHOUSE;
  protected readonly motivoMax = MOTIVO_MAX;
  protected readonly textMax = TEXT_MAX;

  // --- búsqueda ------------------------------------------------------------------------------------------------------
  protected readonly lot = signal('');
  protected readonly fromWarehouse = signal(this.config.fromWarehouse ?? '');
  protected readonly searching = signal(false);
  protected readonly result = signal<{ lot: string; rows: LotStockRow[] } | null>(null);
  protected readonly quantities = signal<Record<string, string>>({});
  private readonly message = signal<StatusMessage | null>(null);

  /** Las filas que se ven: con origen elegido (liberar), solo las de ese almacén; si no, todas. */
  protected readonly visibleRows = computed(() => {
    const r = this.result();
    if (!r) return [];
    const from = this.config.pickFrom ? this.fromWarehouse() : null;
    return from ? r.rows.filter((x) => x.WarehouseCode === from) : r.rows;
  });
  protected readonly key = rowKey;

  protected async search(): Promise<void> {
    const lot = this.lot().trim();
    if (!lot || this.searching()) return;
    this.searching.set(true);
    this.message.set({ kind: 'info', text: 'Buscando el lote…' });
    this.result.set(null);
    this.quantities.set({});
    this.confirming.set(false);
    try {
      const rows = await this.api.stock(lot);
      if (!rows.length) throw new Error(`No se encontró stock para el lote «${lot}»`);
      if (this.config.pickFrom && !rows.some((r) => r.WarehouseCode === this.fromWarehouse())) throw new Error(`El lote «${lot}» no tiene stock en el almacén ${this.fromWarehouse()}`);
      this.result.set({ lot, rows });
      this.form.set(initialForm(this.config, todayIso(), this.defaultSeries.value() ?? null));
      this.message.set(null);
    } catch (e) {
      this.message.set({ kind: 'err', text: e instanceof Error && !('status' in e) ? e.message : apiErrorMessage(e) });
    } finally {
      this.searching.set(false);
    }
  }

  // --- selección -----------------------------------------------------------------------------------------------------
  protected isLocked(row: LotStockRow): boolean {
    return row.WarehouseCode === this.config.lockedWarehouse;
  }
  protected isSelected(row: LotStockRow): boolean {
    return rowKey(row) in this.quantities();
  }
  protected toggle(row: LotStockRow): void {
    if (this.isLocked(row)) return;
    const key = rowKey(row);
    this.quantities.update((q) => {
      if (key in q) {
        const { [key]: _removed, ...rest } = q;
        return rest;
      }
      // al marcar la fila se precarga con todo el stock (se puede bajar, no superar)
      return { ...q, [key]: String(row.Quantity) };
    });
  }
  protected setQuantity(row: LotStockRow, source: string | HTMLInputElement): void {
    const clamped = clampQuantity(row, typeof source === 'string' ? source : source.value);
    // si se recortó, el casillero debe mostrar el valor corregido aunque el valor guardado no haya cambiado
    if (typeof source !== 'string') source.value = clamped;
    this.quantities.update((q) => ({ ...q, [rowKey(row)]: clamped }));
  }
  protected qtyError(row: LotStockRow): string {
    return quantityError(row, this.quantities()[rowKey(row)] ?? '');
  }
  protected readonly selected = computed(() => this.visibleRows().filter((r) => this.isSelected(r)).map((row) => ({ row, quantity: this.quantities()[rowKey(row)] ?? '' })));

  // --- solicitud -----------------------------------------------------------------------------------------------------
  protected readonly form = signal<TransferForm>(initialForm(this.config, todayIso()));
  protected set(change: Partial<TransferForm>): void {
    this.form.update((f) => ({ ...f, ...change }));
  }
  protected over = (text: string, max: number): string => (text.length > max ? `Máximo ${max} caracteres` : '');

  protected readonly catalogs = resource({ loader: () => this.api.catalogs() });
  protected readonly options = computed(() => this.catalogs.value() ?? { movimientoInventario: [], tipoOperacion: [], tipoDespacho: [], movimientoAlmacen: [] });
  protected readonly series = resource({ loader: () => this.api.series().catch(() => []) });
  /** La serie por defecto de SAP: queda elegida al buscar el lote (se puede cambiar o dejar en blanco). */
  private readonly defaultSeries = resource({ loader: () => this.api.defaultSeries().catch(() => null) });

  protected readonly problems = computed(() => {
    const f = this.form();
    const errors = transferErrors(this.config, f, this.selected());
    if (f.motivo.length > MOTIVO_MAX || f.comentario.length > TEXT_MAX || f.accion.length > TEXT_MAX) errors.push('Algún texto es demasiado largo');
    return errors;
  });

  protected readonly confirming = signal(false);
  protected readonly saving = signal(false);

  protected async create(): Promise<void> {
    const r = this.result();
    if (!r || this.saving() || this.problems().length) return;
    this.saving.set(true);
    try {
      const doc = await this.api.create(transferPayload(r.lot, this.form(), this.selected()));
      // éxito: se vuelve a la búsqueda y el aviso queda arriba (el panel del lote desaparece)
      this.result.set(null);
      this.lot.set('');
      this.quantities.set({});
      this.message.set({ kind: 'ok', text: `Solicitud de traslado creada en SAP (Doc. ${doc['DocNum'] ?? doc['DocEntry']}).` });
    } catch (e) {
      // el error deja el panel con todo lo completado para corregir y reintentar
      this.message.set({ kind: 'err', text: apiErrorMessage(e) });
    } finally {
      this.confirming.set(false);
      this.saving.set(false);
    }
  }

  protected readonly status = computed<StatusMessage>(() => this.message() ?? { kind: 'info', text: this.result() ? 'Marque los almacenes, complete la solicitud y genérela.' : 'Escriba el número de lote y pulse «Buscar».' });
}