/**
 * 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 } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { Observable } from 'rxjs';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
import { OssLine, OssReturnBase } from './oss-return.base';

/**
 * OSS 1 — Return on Assets and Liabilities (RAL), return code R070.
 *
 * The bank's balance sheet restated on RBI's line structure, every figure read from the ledger as
 * at the quarter end. Liabilities must equal assets; where they do not, the return says so rather
 * than hiding the difference, because an imbalance is a real condition of the books that the filer
 * has to see before filing.
 */
@Component({
  selector: 'mifosx-oss1-live',
  templateUrl: './oss-return.component.html',
  styleUrls: ['../oss-return.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    FaIconComponent,
    FormsModule
  ]
})
export class Oss1LiveComponent extends OssReturnBase implements OnInit {
  protected readonly exportStem = 'RBI_OSS1_RAL';
  readonly configRoute = '/organization/oss1-gl-config';
  readonly configLinkLabel = 'Open OSS 1 GL Configuration';
  readonly returnShortName = 'OSS 1';

  /**
   * Whether the two sides balance — the first thing to check on a balance sheet, and the reason
   * the difference is stated rather than absorbed.
   */
  get headlineIsBad(): boolean {
    return this.data?.balanced === false;
  }

  get headline(): string {
    if (!this.data) {
      return '';
    }
    const liabilities = this.amount(this.data.totalLiabilities);
    const assets = this.amount(this.data.totalAssets);
    if (!this.headlineIsBad) {
      return (
        `Total Liabilities <strong>&#8377;${liabilities}</strong> &middot; ` +
        `Total Assets <strong>&#8377;${assets}</strong> &middot; the two sides agree`
      );
    }
    return (
      `Total Liabilities <strong>&#8377;${liabilities}</strong> &middot; ` +
      `Total Assets <strong>&#8377;${assets}</strong> &middot; ` +
      `OUT OF BALANCE by <strong>&#8377;${this.amount(Math.abs(this.data.imbalance ?? 0))}</strong> — ` +
      'resolve before filing'
    );
  }

  protected fetch(quarterEndDate: string): Observable<any> {
    return this.rbiService.getOss1(quarterEndDate);
  }

  ngOnInit(): void {
    this.load();
  }

  protected sections(): { title: string; unit: string; lines: OssLine[] }[] {
    if (!this.data) {
      return [];
    }
    return [
      { title: 'Liabilities', unit: 'Rs in Thousands', lines: this.data.liabilities ?? [] },
      { title: 'Assets', unit: 'Rs in Thousands', lines: this.data.assets ?? [] }
    ];
  }

  protected totals(): { label: string; value: number | null | undefined }[] {
    if (!this.data) {
      return [];
    }
    const totals: { label: string; value: number | null | undefined }[] = [
      { label: 'Total Liabilities', value: this.data.totalLiabilities },
      { label: 'Total Assets', value: this.data.totalAssets }
    ];
    // Stated only when the two sides disagree: printing a nil difference on every balanced return
    // would train a reviewer to skip the line that matters when it is not nil.
    if (this.data.balanced === false) {
      totals.push({ label: 'Difference (Assets − Liabilities)', value: this.data.imbalance });
    }
    return totals;
  }

  /** True when the two sides of the balance sheet disagree. */
  get isImbalanced(): boolean {
    return this.data?.balanced === false;
  }
}