/**
 * Copyright since 2025 Mifos Initiative
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

import { Component, OnInit, inject } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { MatIconModule } from '@angular/material/icon';
import { ActivatedRoute, RouterLink } from '@angular/router';
import { catchError, forkJoin, map, of, switchMap } from 'rxjs';
import { CashierService } from '../cashier.service';

interface Denom {
  id: number;
  value: number;
  kind: 'note' | 'coin';
  label: string;
}

interface BranchDay {
  id: number;
  officeId: number;
  officeName: string | null;
  businessDate: string;
  openedByName: string | null;
  openedAt: string | null;
  openingCash: number | null;
  closedByName: string | null;
  closedAt: string | null;
  closingCash: number | null;
  bookCash: number | null;
  cashDifference: number | null;
  forceClosed: boolean;
  forceCloseReason: string | null;
  remarks: string | null;
  status: 'OPEN' | 'CLOSED';
  /** Only present on the missed-close list. */
  daysOpen?: number;
}

/**
 * Branch day register — opening and closing the branch's business day, and the list of days that
 * were opened and never closed.
 *
 * A day left open is not a tidiness problem: its closing balance never carries forward, a
 * back-dated entry can still land in it, and any cash difference on that date goes unnoticed.
 */
@Component({
  selector: 'mifosx-branch-day',
  templateUrl: './branch-day.component.html',
  styleUrls: [
    '../cashier-shared.scss',
    '../day-book/day-book.component.scss',
    './branch-day.component.scss'
  ],
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    MatIconModule,
    RouterLink
  ]
})
export class BranchDayComponent implements OnInit {
  private service = inject(CashierService);
  private route = inject(ActivatedRoute);

  /**
   * Set from the route: the missed-close register is the same data as the day register, shown with
   * only the never-closed days. Two menu entries used to point at one screen, so choosing "Missed
   * Close Register" looked like nothing had happened whenever the branch was up to date.
   */
  missedOnly = false;

  days: BranchDay[] = [];
  missed: BranchDay[] = [];
  openDay: any = null;
  today = '';
  /** Set by the backend from the caller's roles — a cashier may read the register but not act on it. */
  canOperate = false;
  loading = false;
  loaded = false;
  errorMsg = '';
  successMsg = '';
  /** True only for a branch that has never opened a business day and whose Cash at Vault / Cash at
   *  Teller GL account has never had anything posted to it — Open Day here would let day-to-day cash
   *  tracking begin while the ledger silently stays wherever it already was. The backend enforces
   *  this independently too (see BranchDayRegisterApiResource#requireCashMigrationBeforeFirstEverOpen);
   *  this flag only steers the user to the right screen before they hit that rejection. */
  firstOpenNeedsCashMigration = false;

  // Open-day form
  showOpenForm = false;
  openDate = '';
  openingCash: number | null = null;
  /** Required only when the counted/typed opening figure differs from yesterday's own closing
   *  figure — the backend rejects the open without it in that case. */
  openDifferenceReason = '';
  opening = false;

  // Close-day form. The date is fixed by which day is being closed, never typed.
  closeTarget: BranchDay | null = null;
  closingCash: number | null = null;
  closeRemarks = '';
  forceReason = '';
  closing = false;

  // Denomination breakdown, shared by both the open and close forms — a physical note/coin count
  // is the true source of the lump-sum figure, not a typed-in guess. Counted separately per form
  // since opening and closing are two independent physical counts.
  notes: Denom[] = [];
  coins: Denom[] = [];
  openCounts: Record<number, number> = {};
  closeCounts: Record<number, number> = {};
  /** What yesterday's own close counted, note by note — the open form starts from this instead of
   *  zero. The backend already carries this figure forward on its own when nothing is submitted for
   *  the day being opened; showing it here is only about letting whoever opens the day see and
   *  correct it, not a second place the carry-forward logic lives. */
  openCountsAuto: Record<number, number> = {};
  /** What the vault + every cashier's live position added up to when the close form opened — the
   *  physical-count table starts from this instead of zero, since the EOD summary already fetched
   *  it. Kept separately from closeCounts so a manual recount can be told apart from it and undone. */
  closeCountsAuto: Record<number, number> = {};

  get allDenoms(): Denom[] {
    return [
      ...this.notes,
      ...this.coins
    ];
  }

  ngOnInit(): void {
    this.missedOnly = !!this.route.snapshot.data['missedOnly'];
    this.load();
    this.service.getActiveDenominations().subscribe({
      next: (list) => {
        const rows: Denom[] = (list || []).map((x: any) => ({
          id: x.id,
          value: x.denomination,
          kind: x.kind,
          label: '₹' + x.denomination
        }));
        this.notes = rows.filter((r) => r.kind === 'note').sort((a, b) => b.value - a.value);
        this.coins = rows.filter((r) => r.kind === 'coin').sort((a, b) => b.value - a.value);
      },
      error: () => {
        this.notes = [];
        this.coins = [];
      }
    });
  }

  countFor(counts: Record<number, number>, d: Denom): number {
    return counts[d.id] || 0;
  }

  subtotalFor(counts: Record<number, number>, d: Denom): number {
    return this.countFor(counts, d) * d.value;
  }

  onCountChange(counts: Record<number, number>, d: Denom, raw: any): void {
    counts[d.id] = Math.max(0, Math.floor(Number(raw) || 0));
  }

  bumpCount(counts: Record<number, number>, d: Denom, delta: number): void {
    counts[d.id] = Math.max(0, (counts[d.id] || 0) + delta);
  }

  totalOf(counts: Record<number, number>): number {
    return this.allDenoms.reduce((s, d) => s + this.subtotalFor(counts, d), 0);
  }

  /** Denominations with a positive count, shaped for the API payload. */
  private denominationPayload(counts: Record<number, number>) {
    return this.allDenoms
      .filter((d) => this.countFor(counts, d) > 0)
      .map((d) => ({ denominationId: d.id, denominationValue: d.value, count: this.countFor(counts, d) }));
  }

  get openDenomTotal(): number {
    return this.totalOf(this.openCounts);
  }

  get closeDenomTotal(): number {
    return this.totalOf(this.closeCounts);
  }

  /**
   * Savings products whose interest posting report is due today and not yet approved. The close is
   * refused by the backend while any is pending; this only says so before the user tries.
   */
  interestPending: string[] = [];

  private checkInterestReports(): void {
    if (!this.openDay?.businessDate) {
      this.interestPending = [];
      return;
    }
    this.service
      .interestDayCloseCheck(this.openDay.businessDate, this.openDay.officeId)
      .pipe(catchError(() => of(null)))
      .subscribe((res) => (this.interestPending = res?.pendingProducts ?? []));
  }

  load(): void {
    this.loading = true;
    this.errorMsg = '';
    this.service
      .branchDayRegister()
      .pipe(
        catchError((err: any) => {
          this.errorMsg =
            err?.error?.errors?.[0]?.defaultUserMessage ?? err?.error?.message ?? 'Could not load the day register.';
          return of(null);
        })
      )
      .subscribe((res: any) => {
        this.loading = false;
        this.loaded = true;
        this.days = res?.days ?? [];
        this.openDay = res?.openDay ?? null;
        this.today = res?.today ?? '';
        this.canOperate = !!res?.canOperate;
        this.openDate = this.today;
        this.checkFirstOpenCashMigration();
        this.checkInterestReports();
      });

    this.service
      .branchDayMissed()
      .pipe(catchError(() => of(null)))
      .subscribe((res: any) => {
        this.missed = res?.missed ?? [];
      });
  }

  /**
   * Only relevant the moment this branch has never opened a business day before — every later
   * open/close on this screen is untouched, so there is nothing to re-check once history exists.
   */
  private checkFirstOpenCashMigration(): void {
    if (this.days.length > 0 || this.openDay) {
      this.firstOpenNeedsCashMigration = false;
      return;
    }
    this.service.cashGlStatus().subscribe({
      next: (status: any) => {
        // configured === false means this tenant has no Cash at Vault / Cash at Teller account
        // mapped at all — nothing for this check to reconcile against, so it does not block.
        this.firstOpenNeedsCashMigration = status?.configured !== false && !status?.hasBalance;
      },
      error: () => {
        this.firstOpenNeedsCashMigration = false;
      }
    });
  }

  /** True when the branch has no open day at all, so today can be opened. */
  get canOpenToday(): boolean {
    return this.canOperate && !this.openDay && !this.firstOpenNeedsCashMigration;
  }

  /**
   * A still-open day's closing/book figures are dropped from the API response entirely (the
   * backend's Gson instance omits a null map value rather than sending it as JSON null), so the
   * field arrives as undefined, not null. Checking only `!== null` against that — which a stricter
   * pass of this file made the mistake of doing — leaves undefined on the "has a value" branch,
   * which then renders `'₹' + null` (the number pipe's own null output, string-concatenated) as the
   * literal text "₹null". This checks for either, the way an open day actually shows up.
   */
  hasValue(value: number | null | undefined): boolean {
    return value !== null && value !== undefined;
  }

  startOpen(): void {
    this.showOpenForm = true;
    this.openDate = this.today;
    // Left blank on purpose: the backend carries yesterday's closing forward, and typing a figure
    // over it is how a carried balance drifts.
    this.openingCash = null;
    this.openCounts = {};
    this.openCountsAuto = {};
    this.openDifferenceReason = '';
    this.successMsg = '';
    this.errorMsg = '';
    this.loadCarriedForwardDenominations();
  }

  cancelOpen(): void {
    this.showOpenForm = false;
    this.openCountsAuto = {};
  }

  /**
   * Pulls yesterday's own closing note/coin count so the open form shows what is about to be
   * carried forward instead of a blank table the caller has to trust blindly. Only the most
   * recently closed day is used — the same day the backend itself falls back to when the caller
   * submits no denominations and no lump sum.
   */
  private loadCarriedForwardDenominations(): void {
    const lastClosed = this.days.find((d) => d.status === 'CLOSED' && d.closingCash != null);
    if (!lastClosed) return;
    this.service
      .branchDayDenominations(lastClosed.officeId, lastClosed.businessDate)
      .pipe(catchError(() => of(null)))
      .subscribe((res: any) => {
        const closing = res?.closing || [];
        if (!closing.length) return;
        const totals: Record<number, number> = {};
        for (const d of closing) {
          totals[d.denominationId] = (totals[d.denominationId] || 0) + Number(d.count || 0);
        }
        this.openCountsAuto = totals;
        // Only overwrite the table if nothing has been typed/counted since the form opened.
        if (this.openDenomTotal === 0 && this.openingCash == null) {
          this.openCounts = { ...totals };
        }
      });
  }

  get hasAutoFilledOpenCounts(): boolean {
    return Object.keys(this.openCountsAuto).length > 0;
  }

  autoOpenCountFor(d: Denom): number {
    return this.openCountsAuto[d.id] || 0;
  }

  resetOpenToAutoFill(): void {
    this.openCounts = { ...this.openCountsAuto };
  }

  get carriedForwardTotal(): number {
    return this.totalOf(this.openCountsAuto);
  }

  /** The figure the form would actually submit right now — the denomination total when any note/coin
   *  has been counted, otherwise the plain typed-in amount. Mirrors {@link effectiveClosingFigure}. */
  get effectiveOpeningFigure(): number | null {
    return this.openDenomTotal > 0 ? this.openDenomTotal : this.openingCash;
  }

  /** Difference between what is about to be opened with and what yesterday actually closed with —
   *  visible before saving, the same way the close form shows a live difference against the book
   *  figure, so a short/excess opening count isn't discovered only after the day is already running. */
  get openLiveDifference(): number | null {
    if (!this.hasAutoFilledOpenCounts || this.effectiveOpeningFigure == null) return null;
    return this.effectiveOpeningFigure - this.carriedForwardTotal;
  }

  /** True once a reason is needed but hasn't been typed — the same "explain the gap before it's
   *  allowed" gate the close form already applies to a late close. */
  get needsOpenDifferenceReason(): boolean {
    return this.openLiveDifference != null && this.openLiveDifference !== 0 && !this.openDifferenceReason.trim();
  }

  get canSubmitOpen(): boolean {
    return !!this.openDate && !this.opening && !this.needsOpenDifferenceReason;
  }

  submitOpen(): void {
    if (!this.openDate || this.needsOpenDifferenceReason) return;
    this.opening = true;
    this.errorMsg = '';
    const denominations = this.denominationPayload(this.openCounts);
    this.service
      .openBranchDay(
        this.openDate,
        this.openingCash ?? undefined,
        undefined,
        denominations,
        this.openDifferenceReason.trim() || undefined
      )
      .pipe(
        catchError((err: any) => {
          this.errorMsg =
            err?.error?.errors?.[0]?.defaultUserMessage ?? err?.error?.message ?? 'Could not open the day.';
          return of(null);
        })
      )
      .subscribe((res: any) => {
        this.opening = false;
        if (res) {
          this.showOpenForm = false;
          this.successMsg = `Business day ${res.businessDate} opened.`;
          this.load();
        }
      });
  }

  /** The day's expected figure and the working behind it, fetched when the close form opens. */
  preview: any = null;
  previewLoading = false;

  startClose(day: BranchDay): void {
    this.closeTarget = day;
    this.closingCash = null;
    this.closeCounts = {};
    this.closeCountsAuto = {};
    this.closeRemarks = '';
    this.forceReason = '';
    this.successMsg = '';
    this.errorMsg = '';
    this.preview = null;

    // Pre-fill the counted figure with what the books expect. It stays editable — the day is still
    // closed on what was physically counted — but in the ordinary case where the drawer tallies
    // there is nothing to type, and no chance of a slip of the keyboard inventing a difference.
    this.previewLoading = true;
    this.service
      .branchDayClosePreview(day.businessDate)
      .pipe(catchError(() => of(null)))
      .subscribe((res: any) => {
        this.previewLoading = false;
        this.preview = res;
        if (res?.expectedCash != null && this.closingCash == null) {
          this.closingCash = Number(res.expectedCash);
        }
      });

    this.loadEodSummary(day);
  }

  // ── EOD denomination summary: what's in the vault, and what every cashier under it is
  // currently holding, fetched automatically so closing the day doesn't require separately
  // checking Vault Position and every cashier's own Cashier Position screen by hand. ──

  eodLoading = false;
  eodTellers: any[] = [];

  /**
   * Vault + every cashier's current holding, added up across the whole branch and checked against
   * the book figure — the question a manager actually needs answered at close: does the BRANCH
   * tally, not just the vault alone. Computed on read rather than stored, so it never has to be
   * kept in sync across the two independent loads (the book preview and the EOD summary) that feed
   * it.
   */
  get branchTotalSummary(): {
    vaultTotal: number;
    cashierTotal: number;
    grandTotal: number;
    expected: number;
    difference: number;
  } | null {
    if (!this.preview || this.eodTellers.length === 0) return null;
    let vaultTotal = 0;
    let cashierTotal = 0;
    for (const t of this.eodTellers) {
      vaultTotal += Number(t.vault?.totalAmount ?? 0);
      for (const c of t.cashiers) {
        cashierTotal += Number(c.currentTotal ?? 0);
      }
    }
    const grandTotal = vaultTotal + cashierTotal;
    const expected = Number(this.preview.expectedCash ?? 0);
    return { vaultTotal, cashierTotal, grandTotal, expected, difference: grandTotal - expected };
  }

  private loadEodSummary(day: BranchDay): void {
    this.eodLoading = true;
    this.eodTellers = [];
    this.service
      .getTellers(day.officeId)
      .pipe(
        switchMap((tellers) => {
          const list = tellers || [];
          if (!list.length) return of([]);
          return forkJoin(list.map((t: any) => this.loadTellerSummary(t, day.businessDate)));
        }),
        catchError(() => of([]))
      )
      .subscribe((results: any[]) => {
        this.eodLoading = false;
        this.eodTellers = results;
        this.autoFillCloseCounts();
      });
  }

  /**
   * Seeds the physical-count table from what the vault and every cashier are already shown to be
   * holding, instead of leaving it at zero and making whoever closes the day re-key numbers that
   * are already on screen above. It stays a starting point, not a lock — any row can still be
   * corrected against what was actually counted, and {@link resetToAutoFill} undoes a correction.
   */
  private autoFillCloseCounts(): void {
    const totals: Record<number, number> = {};
    for (const t of this.eodTellers) {
      for (const d of t.vault?.denominations || []) {
        totals[d.denominationId] = (totals[d.denominationId] || 0) + Number(d.count || 0);
      }
      for (const c of t.cashiers || []) {
        for (const d of c.denominations || []) {
          totals[d.denominationId] = (totals[d.denominationId] || 0) + Number(d.count || 0);
        }
      }
    }
    if (Object.keys(totals).length === 0) return;
    this.closeCountsAuto = totals;
    this.closeCounts = { ...totals };
  }

  get hasAutoFilledCounts(): boolean {
    return Object.keys(this.closeCountsAuto).length > 0;
  }

  /** The auto-fetched count for one denomination, so a row that was hand-edited away from it can
   *  still show what the vault + cashier positions said. */
  autoCountFor(d: Denom): number {
    return this.closeCountsAuto[d.id] || 0;
  }

  resetToAutoFill(): void {
    this.closeCounts = { ...this.closeCountsAuto };
  }

  private loadTellerSummary(teller: any, date: string) {
    return forkJoin({
      vault: this.service.vaultPosition(teller.id, date).pipe(catchError(() => of(null))),
      cashiers: this.service.getCashiersForTeller(teller.id).pipe(catchError(() => of({ cashiers: [] })))
    }).pipe(
      switchMap(({ vault, cashiers }) => {
        const cashierList = cashiers?.cashiers || [];
        if (!cashierList.length) {
          return of({ tellerId: teller.id, tellerName: teller.name, vault, cashiers: [] });
        }
        return forkJoin(cashierList.map((c: any) => this.loadCashierSummary(c, date))).pipe(
          map((cashierSummaries: any[]) => ({
            tellerId: teller.id,
            tellerName: teller.name,
            vault,
            cashiers: cashierSummaries
          }))
        );
      })
    );
  }

  private loadCashierSummary(cashier: any, date: string) {
    return forkJoin({
      position: this.service.cashierPositionReport(cashier.id, date).pipe(catchError(() => of(null))),
      morning: this.service.getCashierMorningBalance(cashier.id, date).pipe(catchError(() => of(null))),
      reconciliation: this.service.checkReconciliation(cashier.id, date).pipe(catchError(() => of(null))),
      settlement: this.service.checkSettlement(cashier.id, date).pipe(catchError(() => of(null))),
      glEntries: this.service.getGlEntries(date, cashier.id, undefined, 0, 1).pipe(catchError(() => of(null)))
    }).pipe(
      map(({ position, morning, reconciliation, settlement, glEntries }: any) => {
        const morningMap = new Map<number, number>();
        (morning?.denominations || []).forEach((d: any) => morningMap.set(d.denominationId, d.morningCount ?? 0));
        return {
          cashierId: cashier.id,
          cashierName: cashier.staffName,
          morningTotal: Number(morning?.totalMorning ?? 0),
          currentTotal: Number(position?.totalAmount ?? 0),
          reconciled: reconciliation?.reconciled ?? null,
          alreadySettled: settlement?.alreadySettled ?? null,
          txnCount: glEntries?.totalFilteredRecords ?? null,
          denominations: ((position?.denominations || []) as any[]).map((d: any) => ({
            ...d,
            morningCount: morningMap.get(d.denominationId) ?? 0,
            delta: d.count - (morningMap.get(d.denominationId) ?? 0)
          }))
        };
      })
    );
  }

  /** The counted figure the form would submit right now — the denomination total when any note/coin
   *  has been counted, otherwise the plain typed-in amount. */
  get effectiveClosingFigure(): number | null {
    return this.closeDenomTotal > 0 ? this.closeDenomTotal : this.closingCash;
  }

  /** Difference the form would record right now, so it is visible before saving. */
  get liveDifference(): number | null {
    if (!this.preview || this.effectiveClosingFigure == null) return null;
    return Number(this.effectiveClosingFigure) - Number(this.preview.expectedCash ?? 0);
  }

  /** Puts the expected figure back after an edit. */
  useExpected(): void {
    if (this.preview?.expectedCash != null) {
      this.closingCash = Number(this.preview.expectedCash);
    }
  }

  cancelClose(): void {
    this.closeTarget = null;
    this.eodTellers = [];
    this.closeCountsAuto = {};
  }

  /** A date earlier than today is a late close, and has to say why it was left open. */
  get isLateClose(): boolean {
    return !!this.closeTarget && this.closeTarget.businessDate < this.today;
  }

  /**
   * True when any cashier who was given cash (currentTotal > 0) is still NOT reconciled
   * or NOT settled — meaning outstanding cash hasn't been accounted for yet.
   */
  get hasUnreconciledOrUnsettledCashiers(): boolean {
    for (const t of this.eodTellers) {
      for (const c of t.cashiers) {
        if (c.currentTotal > 0 && (c.reconciled === false || c.alreadySettled === false)) {
          return true;
        }
      }
    }
    return false;
  }

  /** Names of cashiers blocking the close, for the error message. */
  get unreconciledOrUnsettledCashierDetails(): { name: string; notReconciled: boolean; notSettled: boolean }[] {
    const result: { name: string; notReconciled: boolean; notSettled: boolean }[] = [];
    for (const t of this.eodTellers) {
      for (const c of t.cashiers) {
        if (c.currentTotal > 0 && (c.reconciled === false || c.alreadySettled === false)) {
          result.push({
            name: c.cashierName,
            notReconciled: c.reconciled === false,
            notSettled: c.alreadySettled === false
          });
        }
      }
    }
    return result;
  }

  /**
   * Whether a reason has to be given before the day can close.
   *
   * Only for a late close. Cash still sitting with a cashier is not something a reason excuses —
   * see canSubmitClose.
   */
  get needsForceReason(): boolean {
    return this.isLateClose;
  }

  get canSubmitClose(): boolean {
    const hasFigure = this.closingCash != null || this.closeDenomTotal > 0;
    if (!this.closeTarget || !hasFigure || this.closing) return false;
    // Block while cashier/vault data is still loading — the reconciliation check can't run yet.
    if (this.eodLoading || this.previewLoading) return false;
    // An unreconciled cashier is a reason-required condition, not an absolute block: the backend
    // accepts the close once a reason is recorded (and appends the cashiers' names to it), and
    // refusing outright left a day that could never be closed at all — a cashier who reconciled on
    // the wrong date, went on leave, or left mid-shift would strand that day and every day after it.
    if (this.isLateClose || this.hasUnreconciledOrUnsettledCashiers) {
      return !!this.forceReason.trim();
    }
    return true;
  }

  submitClose(): void {
    if (this.eodLoading || this.previewLoading) {
      this.errorMsg = 'Still loading the cashier and vault positions — try again in a moment.';
      return;
    }
    // Safety net mirroring canSubmitClose: never send a close that the backend will refuse for a
    // missing override reason.
    if ((this.isLateClose || this.hasUnreconciledOrUnsettledCashiers) && !this.forceReason.trim()) {
      this.errorMsg = 'Record why this day is being closed before submitting.';
      return;
    }
    const day = this.closeTarget;
    const denominations = this.denominationPayload(this.closeCounts);
    const figure = denominations.length ? this.closeDenomTotal : this.closingCash;
    if (!day || figure == null) return;

    this.closing = true;
    this.errorMsg = '';
    this.service
      .closeBranchDay(
        day.businessDate,
        Number(figure),
        this.closeRemarks.trim() || undefined,
        // Sent whenever one was typed, not only on a late close: it is also the override the backend
        // needs for a same-day close over an unreconciled cashier, and gating it on isLateClose
        // dropped it on exactly the request that could not succeed without it.
        this.forceReason.trim() || undefined,
        undefined,
        denominations
      )
      .pipe(
        catchError((err: any) => {
          this.errorMsg =
            err?.error?.errors?.[0]?.defaultUserMessage ?? err?.error?.message ?? 'Could not close the day.';
          return of(null);
        })
      )
      .subscribe((res: any) => {
        this.closing = false;
        if (res) {
          this.closeTarget = null;
          const diff = Number(res.cashDifference ?? 0);
          this.successMsg =
            diff === 0
              ? `Business day ${res.businessDate} closed — cash tallied.`
              : `Business day ${res.businessDate} closed with a difference of ₹${diff.toFixed(2)}.`;
          this.load();
        }
      });
  }

  absValue(n: number): number {
    return Math.abs(n);
  }

  /** Short/excess wording, since a bare signed number reads ambiguously on a cash figure. */
  differenceLabel(d: number | null): string {
    if (d == null) return '—';
    const n = Number(d);
    if (n === 0) return 'Tallied';
    return n > 0 ? `Excess ₹${Math.abs(n).toFixed(2)}` : `Short ₹${Math.abs(n).toFixed(2)}`;
  }

  stamp(iso: string | null): string {
    if (!iso) return '—';
    const [
      d,
      t
    ] = iso.split('T');
    return t ? `${d} ${t.slice(0, 5)}` : d;
  }

  timeOnly(iso: string | null): string {
    if (!iso) return '—';
    const t = iso.split('T')[1];
    return t ? t.slice(0, 5) : '—';
  }
}