/**
 * 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 { Injectable, inject } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import { Observable } from 'rxjs';

export interface RbiFeedItem {
  id: number;
  title: string;
  link: string;
  description: string;
  pubDate: any; // Fineract returns [year,month,day,hour,min,sec] array
  category: string;
  fetchedOn?: any;
  openProjectWpId?: number; // OpenProject work package ID
  openProjectWpStatus?: string;
  openProjectWpProgress?: number;
}

@Injectable({
  providedIn: 'root'
})
export class RbiCircularsService {
  private http = inject(HttpClient);

  getAll(category?: string): Observable<RbiFeedItem[]> {
    let params = new HttpParams();
    if (category) {
      params = params.set('category', category);
    }
    return this.http.get<RbiFeedItem[]>('/rbi-feeds', { params });
  }

  getById(id: number): Observable<RbiFeedItem> {
    return this.http.get<RbiFeedItem>(`/rbi-feeds/${id}`);
  }

  triggerFetch(): Observable<any> {
    return this.http.post('/rbi-feeds/fetch', {});
  }

  /**
   * Members and share capital per share type for one financial year, with the year before alongside.
   *
   * @param financialYear the year the FY opens in — 2025 means FY 2025-26.
   */
  getShareCapitalReturn(financialYear: number): Observable<any> {
    return this.http.get('/shareproducts/capital-return', {
      params: new HttpParams().set('financialYear', String(financialYear))
    });
  }

  /** Financial years that actually have share activity, newest first, for the year picker. */
  getShareCapitalReturnYears(): Observable<any> {
    return this.http.get('/shareproducts/capital-return/financial-years');
  }

  /**
   * Form 1 — CRR, computed live from the ledger for the fortnight the reporting date falls in.
   *
   * The DTL base and the balances maintained are read as at different dates: the base lags by 45
   * days (snapped back to a reporting Friday), the holdings are as at the reporting date itself.
   * The response's `basis` block states both, so the lag is auditable rather than implied.
   *
   * @param reportingDate yyyy-MM-dd. Defaults to the current business date on the backend.
   * @param officeId Optional — scopes every figure to one office.
   */
  getForm1(reportingDate?: string, baseDate?: string, officeId?: number): Observable<any> {
    let params = new HttpParams();
    if (reportingDate) {
      params = params.set('reportingDate', reportingDate);
    }
    // The base date can be given outright. The 45-day lag lands where it lands, and a bank reading
    // an earlier fortnight — or correcting a filing — needs to name the date the base is struck at
    // rather than work backwards from it. Left blank it is derived from the lag as before.
    if (baseDate) {
      params = params.set('baseDate', baseDate);
    }
    if (officeId != null) {
      params = params.set('officeId', String(officeId));
    }
    return this.http.get('/rbireservereturn/form1', { params });
  }

  /**
   * Form 9 — SLR, computed live on the month-end position. Any date within a month resolves to that
   * month's end, since the return reports the position at close.
   */
  getForm9(reportingDate?: string, officeId?: number): Observable<any> {
    let params = new HttpParams();
    if (reportingDate) {
      params = params.set('reportingDate', reportingDate);
    }
    if (officeId != null) {
      params = params.set('officeId', String(officeId));
    }
    return this.http.get('/rbireservereturn/form9', { params });
  }

  /**
   * Form 9 in the shape it is filed — the statutory statement of compliance with section 24.
   *
   * A different statement from `getForm9`, not a reformatting: three dated columns rather than one,
   * and the ratio charged on the last Friday of the second preceding fortnight rather than on the
   * month end itself.
   */
  getForm9Statutory(reportingDate?: string, officeId?: number): Observable<any> {
    let params = new HttpParams();
    if (reportingDate) {
      params = params.set('reportingDate', reportingDate);
    }
    if (officeId != null) {
      params = params.set('officeId', String(officeId));
    }
    return this.http.get('/rbireservereturn/form9-statutory', { params });
  }

  /**
   * Form IX — the Return on Assets and Liabilities a co-operative bank files monthly, code R408.
   *
   * A different return from `getForm9` despite the name: that one reports the SLR ratio, this one
   * reports the whole balance sheet. Every figure comes back in rupees thousands, with the rupee
   * figure alongside it so a line can still be reconciled against the ledger.
   *
   * @param reportingDate yyyy-MM-dd — any date in the month; the return reports that month's end.
   */
  getForm9Return(reportingDate?: string, officeId?: number): Observable<any> {
    let params = new HttpParams();
    if (reportingDate) {
      params = params.set('reportingDate', reportingDate);
    }
    if (officeId != null) {
      params = params.set('officeId', String(officeId));
    }
    return this.http.get('/rbireservereturn/form9-return', { params });
  }

  /**
   * OSS 1 — Return on Assets and Liabilities, computed live from the ledger.
   *
   * Every figure is a closing balance as at the quarter end; the bank's own particulars come from
   * the institution profile. Any date inside a quarter resolves to that quarter, so a caller never
   * has to know which day a quarter ends on.
   *
   * @param quarterEndDate yyyy-MM-dd — any date in the quarter. Defaults to the business date.
   * @param officeId Optional — scopes every figure to one office.
   */
  getOss1(quarterEndDate?: string, officeId?: number): Observable<any> {
    return this.http.get('/ossreturn/oss1', { params: this.ossParams(quarterEndDate, officeId) });
  }

  /**
   * OSS 2 — Return on Earnings, computed live from the ledger.
   *
   * Earnings lines report the movement over the quarter rather than a closing balance, so the same
   * accounts read as balances would carry forward every earlier quarter's income as well.
   */
  getOss2(quarterEndDate?: string, officeId?: number): Observable<any> {
    return this.http.get('/ossreturn/oss2', { params: this.ossParams(quarterEndDate, officeId) });
  }

  /**
   * Form 1 as a co-operative bank files it — Banking Regulation (Co-operative Societies) Rules
   * 1966, Rule 5, sections 18(1) and 24(3).
   *
   * A different statement from `getForm1`, not a reformatting: three columns rather than one, both
   * ratios settled on the same liabilities, and those liabilities taken from the last Friday of the
   * second preceding fortnight rather than a 45-day lag.
   */
  getForm1Statutory(
    reportingDate?: string,
    firstColumnDate?: string,
    secondColumnDate?: string,
    officeId?: number
  ): Observable<any> {
    let params = new HttpParams();
    if (reportingDate) {
      params = params.set('reportingDate', reportingDate);
    }
    // Both fortnight closes can be given outright. A bank filing August wants 15/08 and 31/08 on
    // the face of the form whatever today is, and one date cannot produce a pair that spans a month
    // boundary or skips a fortnight — which a late or corrected filing needs.
    if (firstColumnDate) {
      params = params.set('firstColumnDate', firstColumnDate);
    }
    if (secondColumnDate) {
      params = params.set('secondColumnDate', secondColumnDate);
    }
    if (officeId != null) {
      params = params.set('officeId', String(officeId));
    }
    return this.http.get('/rbireservereturn/form1-statutory', { params });
  }

  // ── Saved returns ──

  /**
   * Returns saved earlier, newest first. A saved return is served from the snapshot taken when it
   * was saved, never recomputed — a backdated entry or a changed mapping would otherwise produce a
   * different statement from the one that was reviewed.
   */
  getSavedReturns(formCode?: string): Observable<any> {
    let params = new HttpParams();
    if (formCode) {
      params = params.set('formCode', formCode);
    }
    return this.http.get('/rbiformafiling', { params });
  }

  /** One saved return, with the stored snapshot, so the screen renders what was saved. */
  getSavedReturn(filingId: number): Observable<any> {
    return this.http.get(`/rbiformafiling/${filingId}`);
  }

  /** Keeps the return currently on screen. Re-saving the same form and date replaces it. */
  saveReturn(formCode: string, reportingDate: string, report: any, remarks?: string): Observable<any> {
    return this.http.post('/rbiformafiling', {
      formCode,
      reportingDate,
      report,
      remarks,
      locale: 'en',
      dateFormat: 'yyyy-MM-dd'
    });
  }

  /** Moves a saved return along its filing lifecycle; the snapshot itself is untouched. */
  updateSavedReturnStatus(filingId: number, status: string, remarks?: string): Observable<any> {
    return this.http.post(`/rbiformafiling/${filingId}/status`, { status, remarks });
  }

  deleteSavedReturn(filingId: number): Observable<any> {
    return this.http.delete(`/rbiformafiling/${filingId}`);
  }

  private ossParams(quarterEndDate?: string, officeId?: number): HttpParams {
    let params = new HttpParams();
    if (quarterEndDate) {
      params = params.set('quarterEndDate', quarterEndDate);
    }
    if (officeId != null) {
      params = params.set('officeId', String(officeId));
    }
    return params;
  }
}