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, SboField, SelectField, TextField, TextInput } from '../../shared/form';
import type { DetailColumn } from '../../shared/grid/grid.types';
import { RowsTable } from '../../shared/grid/rows-table';
import { Icon, SboWindow, Toolbar, type StatusMessage, type WindowBadge } from '../../shared/window';
import { ACCOUNT_LOOKUP, INDICATOR_LOOKUP, PROJECT_LOOKUP, dimensionLookup } from '../documents/dimension-lookups';
import type { NavTarget } from '../documents/document-model';
import { isManualJournal, journalOrigin, journalPayload, journalTotals, validateJournal } from './journal-model';

type Row = Record<string, unknown>;

/** Tipo de objeto de SAP del asiento contable (para pedir sus series de numeración). */
const OBJECT_TYPE = 30;

const text = (v: unknown): string => (v === null || v === undefined ? '' : String(v));
const today = (): string => new Date().toISOString().slice(0, 10);
const dateOnly = (v: unknown): string => (typeof v === 'string' ? v.slice(0, 10) : '');

/**
 * Formulario de un asiento contable: `nuevo` (vacío) o `:jdtNum`. Cada línea lleva una cuenta y el debe o el
 * haber; el asiento solo se crea si cuadra. Un asiento contabilizado no se modifica: se consulta y, si es manual,
 * se cancela (SAP genera el asiento de reverso).
 */
@Component({
  selector: 'sbo-journal-form-page',
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [DateField, Icon, LookupField, RouterLink, RowsTable, SboField, SboWindow, SelectField, TextField, TextInput, Toolbar],
  templateUrl: './journal-form.page.html',
  styleUrl: './journal-form.page.css',
})
export class JournalFormPage {
  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 jdtNum = toSignal(this.route.paramMap.pipe(map((p) => (p.has('jdtNum') ? Number(p.get('jdtNum')) : null))), {
    initialValue: this.route.snapshot.paramMap.has('jdtNum') ? Number(this.route.snapshot.paramMap.get('jdtNum')) : null,
  });
  protected readonly isNew = computed(() => this.jdtNum() === null);
  protected readonly saved = computed(() => !this.isNew());

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

  private readonly resource = httpResource<Row>(() => {
    const id = this.jdtNum();
    return id === null ? undefined : `${API_URL}/sl/JournalEntries/${id}`;
  });
  protected readonly doc = computed(() => (this.resource.hasValue() ? this.resource.value() : undefined));
  protected readonly loading = computed(() => this.resource.isLoading());
  protected readonly loadError = computed(() => {
    const err = this.resource.error();
    return err ? (err instanceof HttpErrorResponse && err.status === 404 ? 'El asiento no existe.' : apiErrorMessage(err)) : '';
  });
  protected readonly manual = computed(() => isManualJournal(this.doc()));

  // --- el borrador (o el asiento guardado, mostrado) -----------------------------------------

  protected readonly referenceDate = linkedSignal(() => (this.doc() ? dateOnly(this.doc()!['ReferenceDate']) : today()));
  protected readonly dueDate = linkedSignal(() => dateOnly(this.doc()?.['DueDate']));
  protected readonly taxDate = linkedSignal(() => dateOnly(this.doc()?.['TaxDate']));
  protected readonly series = linkedSignal<number | null>(() => (this.doc() ? Number(this.doc()!['Series']) || null : null));
  protected readonly memo = linkedSignal(() => text(this.doc()?.['Memo']));
  protected readonly reference = linkedSignal(() => text(this.doc()?.['Reference']));
  protected readonly reference2 = linkedSignal(() => text(this.doc()?.['Reference2']));
  protected readonly reference3 = linkedSignal(() => text(this.doc()?.['Reference3']));
  protected readonly indicator = linkedSignal(() => text(this.doc()?.['Indicator']));
  protected readonly folioPrefix = linkedSignal(() => text(this.doc()?.['FolioPrefixString']));
  protected readonly folioNumber = linkedSignal(() => text(this.doc()?.['FolioNumber']));
  protected readonly indicatorLookup = INDICATOR_LOOKUP;
  protected readonly lines = linkedSignal<Row[]>(() => {
    const rows = ((this.doc()?.['JournalEntryLines'] as Row[] | undefined) ?? []).map((l) => ({ ...l }));
    return this.doc() ? rows : [{}, {}];
  });

  protected readonly saving = signal(false);
  protected readonly confirmCancel = 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: `Asiento ${created} creado.` } : null;
    })(),
  );

  protected readonly totals = computed(() => journalTotals(this.lines()));
  protected readonly fmt = (n: number): string => formatNumber(n, 2);

  // --- series de numeración --------------------------------------------------------------------

  private readonly seriesResource = httpResource<SlListResponse<Row>>(() =>
    this.isNew() ? { url: `${API_URL}/sl/SeriesService_GetDocumentSeries`, method: 'POST', body: { DocumentTypeParams: { Document: String(OBJECT_TYPE) } } } : undefined,
  );
  protected readonly seriesOptions = computed(() => {
    const rows = this.seriesResource.hasValue() ? this.seriesResource.value().value : [];
    return rows.filter((r) => r['Locked'] !== 'tYES').map((r) => ({ value: Number(r['Series']), label: text(r['Name']) || String(r['Series']) }));
  });

  // --- vista -----------------------------------------------------------------------------------

  protected readonly columns: readonly DetailColumn[] = [
    { key: 'AccountCode', title: 'Cuenta', type: 'lookup', required: true, lookup: ACCOUNT_LOOKUP, width: '170px' },
    { key: 'ShortName', title: 'Cuenta / socio', type: 'lookup', lookup: ACCOUNT_LOOKUP, width: '170px' },
    { key: 'Debit', title: 'Debe', type: 'number', decimals: 2, width: '120px' },
    { key: 'Credit', title: 'Haber', type: 'number', decimals: 2, width: '120px' },
    { key: 'DueDate', title: 'Vencimiento', type: 'date', width: '120px' },
    { key: 'Reference1', title: 'Ref. 1', type: 'text', width: '110px' },
    { key: 'Reference2', title: 'Ref. 2', type: 'text', width: '110px' },
    { key: 'AdditionalReference', title: 'Ref. 3', type: 'text', width: '110px' },
    { key: 'LineMemo', title: 'Comentarios', type: 'text', width: '220px' },
    ...([1, 2, 3, 4, 5] as const).map((n): DetailColumn => ({
      key: n === 1 ? 'CostingCode' : `CostingCode${n}`,
      title: `Dim. ${n}`,
      type: 'lookup',
      lookup: dimensionLookup(n),
      width: '90px',
    })),
    { key: 'ProjectCode', title: 'Proyecto', type: 'lookup', lookup: PROJECT_LOOKUP, width: '100px' },
  ];

  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.saved()) return { kind: 'info', text: this.manual() ? 'Asiento contabilizado: no se modifica; se puede cancelar.' : `Asiento generado por: ${journalOrigin(this.doc()?.['OriginalJournal'])}. Se cancela desde su documento.` };
    const t = this.totals();
    return t.difference !== 0 ? { kind: 'warn', text: `Falta ${this.fmt(Math.abs(t.difference))} para que el asiento cuadre.` } : { kind: 'info', text: 'Indique las cuentas, con el debe o el haber de cada línea.' };
  });
  protected readonly badge = computed<WindowBadge | undefined>(() => {
    if (this.isNew()) return { label: 'Nuevo', tone: 'info' };
    return this.doc() ? { label: this.manual() ? 'Manual' : 'De documento', tone: this.manual() ? 'ok' : 'muted' } : undefined;
  });
  protected readonly windowTitle = computed(() => {
    const n = this.doc()?.['JdtNum'];
    return n === undefined ? this.title : `${this.title} · ${text(n)}`;
  });

  // --- edición y acciones ----------------------------------------------------------------------

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

  protected addLine(): void {
    this.setLines([...this.lines(), {}]);
  }

  /** Lleva a la última línea lo que falta para cuadrar: el debe o el haber, según el lado que sobra. */
  protected balance(): void {
    const t = this.totals();
    if (t.difference === 0) return;
    const rows = [...this.lines()];
    const last = rows.length - 1;
    const row = { ...rows[last] };
    if (t.difference > 0) {
      // sobra debe: la línea toma el faltante en el haber
      row['Credit'] = (Number(row['Credit']) || 0) + t.difference;
      row['Debit'] = null;
    } else {
      row['Debit'] = (Number(row['Debit']) || 0) - t.difference;
      row['Credit'] = null;
    }
    rows[last] = row;
    this.setLines(rows);
  }

  protected set(key: 'memo' | 'reference' | 'reference2' | 'reference3' | 'folioPrefix' | 'folioNumber', value: string): void {
    this[key].set(value);
    this.message.set(null);
  }

  protected async go(target: NavTarget): Promise<void> {
    try {
      const entry = await this.api.neighbour('JournalEntries', target, this.jdtNum(), undefined, 'JdtNum');
      if (entry === null) {
        this.message.set({ kind: 'warn', text: 'No hay más asientos 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.saved()) return;
    const draft = {
      referenceDate: this.referenceDate(),
      dueDate: this.dueDate(),
      taxDate: this.taxDate(),
      series: this.series(),
      memo: this.memo(),
      reference: this.reference(),
      reference2: this.reference2(),
      reference3: this.reference3(),
      indicator: this.indicator(),
      folioPrefix: this.folioPrefix(),
      folioNumber: this.folioNumber(),
      lines: this.lines(),
    };
    const errors = validateJournal(draft);
    if (errors.length) {
      this.message.set({ kind: 'err', text: errors[0] });
      return;
    }
    this.saving.set(true);
    try {
      const created = await this.api.create('JournalEntries', journalPayload(draft));
      await this.router.navigate(['..', created['JdtNum']], { relativeTo: this.route, state: { created: text(created['JdtNum']) } });
    } catch (e) {
      this.message.set({ kind: 'err', text: apiErrorMessage(e) });
    } finally {
      this.saving.set(false);
    }
  }

  protected async cancelEntry(): Promise<void> {
    const id = this.jdtNum();
    if (id === null || this.saving()) return;
    this.saving.set(true);
    this.confirmCancel.set(false);
    try {
      await this.api.action('JournalEntries', id, 'Cancel');
      this.message.set({ kind: 'ok', text: 'Asiento cancelado: SAP generó el asiento de reverso.' });
      this.resource.reload();
    } catch (e) {
      this.message.set({ kind: 'err', text: apiErrorMessage(e) });
    } finally {
      this.saving.set(false);
    }
  }
}