/**
 * 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 } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import * as ExcelJS from 'exceljs';
import {
  addBanner,
  addLineRows,
  addSectionHeader,
  boxAllCells,
  buildGeneralInfoSheet,
  buildSignatorySheet,
  downloadWorkbook,
  newWorkbook,
  solidFill,
  XL
} from '../oss-workbook';
import {
  RAL_AGEING_HEADERS,
  RAL_ASSETS,
  RAL_BALANCE_SHEET_NOTES,
  RAL_COMPLAINTS,
  RAL_DEPOSITORS_BORROWERS,
  RAL_GENERAL_INFO,
  RAL_INTER_BANK_AGEING,
  RAL_INTER_BRANCH_AGEING,
  RAL_LIABILITIES,
  RAL_MEMO,
  RAL_OTHER_FUNDS,
  RAL_SIGNATORIES,
  RAL_SUNDRY_DEBTORS,
  RAL_SUNDRY_DEBTORS_NOTE,
  RAL_TOP_20_DEPOSITS,
  RAL_UNSECURED_GUARANTEES,
  RAL_UNSECURED_GUARANTEES_TOTAL
} from './oss1-ral-data';

type Oss1Tab = 'general' | 'balance-sheet' | 'annexure1' | 'annexure2' | 'signatory';

@Component({
  selector: 'mifosx-oss1-ral',
  templateUrl: './oss1-ral.component.html',
  styleUrls: ['../oss-return.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    FaIconComponent,
    FormsModule
  ]
})
export class Oss1RalComponent {
  activeTab: Oss1Tab = 'general';

  generalInfo = RAL_GENERAL_INFO;
  liabilities = RAL_LIABILITIES;
  assets = RAL_ASSETS;
  memo = RAL_MEMO;
  balanceSheetNotes = RAL_BALANCE_SHEET_NOTES;
  otherFunds = RAL_OTHER_FUNDS;
  topDeposits = RAL_TOP_20_DEPOSITS;
  interBranchAgeing = RAL_INTER_BRANCH_AGEING;
  interBankAgeing = RAL_INTER_BANK_AGEING;
  ageingHeaders = RAL_AGEING_HEADERS;
  unsecuredGuarantees = RAL_UNSECURED_GUARANTEES;
  unsecuredGuaranteesTotal = RAL_UNSECURED_GUARANTEES_TOTAL;
  sundryDebtors = RAL_SUNDRY_DEBTORS;
  sundryDebtorsNote = RAL_SUNDRY_DEBTORS_NOTE;
  depositorsBorrowers = RAL_DEPOSITORS_BORROWERS;
  complaints = RAL_COMPLAINTS;
  signatories = RAL_SIGNATORIES;

  generating = false;
  toastMsg = '';
  toastVisible = false;
  private toastTimer: any;

  showTab(tab: Oss1Tab): void {
    this.activeTab = tab;
  }

  private info(label: string): string {
    return this.generalInfo.find((g) => g.label === label)?.value ?? '';
  }

  get returnName(): string {
    return this.info('Return Name');
  }
  get returnCode(): string {
    return this.info('Return Code');
  }
  get bankName(): string {
    return this.info('Bank Name');
  }
  get bankCode(): string {
    return this.info('Bank Code');
  }
  get quarterEndDate(): string {
    return this.info('Quarter End Date');
  }
  get auditFlag(): string {
    return this.info('Audit Flag');
  }

  /** Total Liabilities must equal Total Assets — surfaced so a mismatch can't be filed unnoticed. */
  get totalLiabilities(): number {
    return this.liabilities.find((l) => l.label.startsWith('15.'))?.value ?? 0;
  }
  get totalAssets(): number {
    return this.assets.find((a) => a.label.startsWith('12.'))?.value ?? 0;
  }
  get isBalanced(): boolean {
    return this.totalLiabilities === this.totalAssets;
  }

  // ══════════════ Excel generation ══════════════

  /** Rebuilds the RBI workbook: one sheet per section, original layout and styling. */
  async generateExcel(): Promise<void> {
    this.generating = true;
    try {
      const wb = newWorkbook();

      buildGeneralInfoSheet(wb, this.generalInfo);
      this.buildBalanceSheet(wb);
      this.buildAnnexure1(wb);
      this.buildAnnexure2(wb);
      buildSignatorySheet(wb, this.signatories);

      await downloadWorkbook(wb, `Form RAL_CIMS ${this.returnCode} OSS 1 - ${this.quarterEndDate}.xlsx`);
      this.toast(`${this.returnCode} workbook generated for quarter ending ${this.quarterEndDate}`);
    } catch {
      this.toast('Could not generate the workbook — please retry');
    } finally {
      this.generating = false;
    }
  }

  private buildBalanceSheet(wb: ExcelJS.Workbook): void {
    const sheet = wb.addWorksheet('Assets & Liabilities');
    sheet.columns = [
      { width: 78 },
      { width: 20 }
    ];
    addBanner(sheet, 'Assets & Liabilities', 'B');

    const first = sheet.rowCount + 1;
    addSectionHeader(sheet, 'Liabilities', 'Rs in Thousands');
    addLineRows(sheet, this.liabilities);

    addSectionHeader(sheet, 'Assets', 'Rs in Thousands');
    addLineRows(sheet, this.assets);
    boxAllCells(sheet, first, sheet.rowCount, 2);

    sheet.addRow([]);
    const notesStart = sheet.rowCount + 1;
    for (const note of this.balanceSheetNotes) {
      const row = sheet.addRow([note]);
      sheet.mergeCells(`A${row.number}:B${row.number}`);
      row.font = { bold: true, size: 10 };
      row.getCell(1).fill = solidFill(XL.headerGrey);
    }
    boxAllCells(sheet, notesStart, sheet.rowCount, 2);

    sheet.addRow([]);
    const memoStart = sheet.rowCount + 1;
    addSectionHeader(sheet, 'Memo', 'Rs in Thousands');
    addLineRows(sheet, this.memo);
    boxAllCells(sheet, memoStart, sheet.rowCount, 2);

    sheet.views = [{ state: 'frozen', ySplit: 3 }];
  }

  private buildAnnexure1(wb: ExcelJS.Workbook): void {
    const sheet = wb.addWorksheet('Annexure 1');
    sheet.columns = [
      { width: 10 },
      { width: 46 },
      { width: 20 },
      { width: 18 },
      { width: 16 },
      { width: 12 },
      { width: 12 },
      { width: 12 }
    ];
    addBanner(sheet, 'Annexure 1', 'H');

    // 1. Break-up of Other Funds and Reserves
    let start = sheet.rowCount + 1;
    const fundsTitle = sheet.addRow(['1. Break-up of Other Funds and Reserves', '', 'Rs in Thousands']);
    sheet.mergeCells(`A${fundsTitle.number}:B${fundsTitle.number}`);
    fundsTitle.font = { bold: true };
    fundsTitle.eachCell((c) => (c.fill = solidFill(XL.headerGrey)));
    for (const line of this.otherFunds) {
      const row = sheet.addRow([line.label, '', line.value]);
      sheet.mergeCells(`A${row.number}:B${row.number}`);
      row.getCell(1).alignment = { wrapText: true, vertical: 'middle' };
      row.getCell(3).numFmt = '#,##0.00';
      if (line.total) {
        row.font = { bold: true };
        row.getCell(3).fill = solidFill(XL.derivedBlue);
        row.getCell(1).alignment = { horizontal: 'center' };
      }
    }
    boxAllCells(sheet, start, sheet.rowCount, 3);
    sheet.addRow([]);

    // 2. Top 20 deposits from other banks / institutions
    start = sheet.rowCount + 1;
    const depTitle = sheet.addRow([
      `2. Particulars of top 20 deposits accepted from other banks / and institutions as on the date of review`
    ]);
    sheet.mergeCells(`A${depTitle.number}:H${depTitle.number}`);
    depTitle.font = { bold: true };
    depTitle.getCell(1).fill = solidFill(XL.headerGrey);

    const depHead = sheet.addRow([
      'Sr. No',
      'Name of Bank / Institution',
      'Amount of deposit',
      'Rate of interest (%)',
      'Date of receipt',
      'Period in Days',
      'Period in Months',
      'Period in Years'
    ]);
    depHead.font = { bold: true };
    depHead.alignment = { wrapText: true, horizontal: 'center', vertical: 'middle' };
    depHead.eachCell((c) => (c.fill = solidFill(XL.headerGrey)));
    for (const d of this.topDeposits) {
      const row = sheet.addRow([
        d.srNo,
        d.institution,
        d.amount,
        d.rateOfInterest,
        d.dateOfReceipt,
        d.days,
        d.months,
        d.years
      ]);
      row.getCell(3).numFmt = '#,##0.00';
    }
    boxAllCells(sheet, start, sheet.rowCount, 8);
    sheet.addRow([]);

    // 3 & 4 — ageing analyses
    start = sheet.rowCount + 1;
    this.addAgeingBlock(
      sheet,
      `3. Age-wise analysis of Inter Branch Adjustment Account - Position as on:${this.quarterEndDate}`,
      this.interBranchAgeing
    );
    sheet.addRow([]);
    this.addAgeingBlock(
      sheet,
      `4. Age-wise analysis of Inter Bank Reconciliation Account - Position as on:${this.quarterEndDate}`,
      this.interBankAgeing
    );
    sheet.addRow([]);

    // 5. Unsecured guarantees
    start = sheet.rowCount + 1;
    const gTitle = sheet.addRow(['5. Unsecured guarantees issued by the bank']);
    sheet.mergeCells(`A${gTitle.number}:D${gTitle.number}`);
    gTitle.font = { bold: true };
    gTitle.getCell(1).fill = solidFill(XL.headerGrey);

    const gHead = sheet.addRow([
      'Sr. No',
      'Name of Borrower',
      'Name of Beneficiary',
      `Amount Outstanding as on:${this.quarterEndDate}`
    ]);
    gHead.font = { bold: true };
    gHead.alignment = { wrapText: true, horizontal: 'center', vertical: 'middle' };
    gHead.eachCell((c) => (c.fill = solidFill(XL.headerGrey)));
    for (const g of this.unsecuredGuarantees) {
      const row = sheet.addRow([g.srNo, g.borrower, g.beneficiary, g.amountOutstanding]);
      row.getCell(4).numFmt = '#,##0.00';
    }
    const gTotal = sheet.addRow(['Total', '', '', this.unsecuredGuaranteesTotal]);
    gTotal.font = { bold: true };
    gTotal.getCell(4).numFmt = '#,##0.00';
    gTotal.getCell(4).fill = solidFill(XL.derivedBlue);

    const gNote = sheet.addRow([
      'Note : *  Give name if borrower/beneficiary is director/top management/related entity. Other guarantees may be consolidated and reported against others.'
    ]);
    sheet.mergeCells(`A${gNote.number}:D${gNote.number}`);
    gNote.font = { bold: true, size: 10 };
    gNote.alignment = { wrapText: true };
    boxAllCells(sheet, start, sheet.rowCount, 4);
  }

  private addAgeingBlock(sheet: ExcelJS.Worksheet, title: string, rows: typeof RAL_INTER_BRANCH_AGEING): void {
    const start = sheet.rowCount + 1;
    const titleRow = sheet.addRow([title]);
    sheet.mergeCells(`A${titleRow.number}:E${titleRow.number}`);
    titleRow.font = { bold: true };
    titleRow.getCell(1).fill = solidFill(XL.headerGrey);

    const head = sheet.addRow([...this.ageingHeaders]);
    head.font = { bold: true };
    head.alignment = { wrapText: true, horizontal: 'center', vertical: 'middle' };
    head.eachCell((c) => (c.fill = solidFill(XL.headerGrey)));

    for (const r of rows) {
      const row = sheet.addRow([
        r.period,
        r.noOfDebitEntries,
        r.amtOfDebitEntries,
        r.noOfCreditEntries,
        r.amtOfCreditEntries
      ]);
      row.getCell(3).numFmt = '#,##0.00';
      row.getCell(5).numFmt = '#,##0.00';
      if (r.period === 'Total') {
        row.font = { bold: true };
        [
          2,
          3,
          4,
          5
        ].forEach(
          (c) => (row.getCell(c).fill = solidFill(XL.derivedBlue))
        );
      }
    }
    boxAllCells(sheet, start, sheet.rowCount, 5);
  }

  private buildAnnexure2(wb: ExcelJS.Workbook): void {
    const sheet = wb.addWorksheet('Annexure 2');
    sheet.columns = [
      { width: 10 },
      { width: 62 },
      { width: 20 },
      { width: 20 }
    ];
    addBanner(sheet, 'Annexure 2', 'D');

    for (const block of this.sundryDebtors) {
      const start = sheet.rowCount + 1;
      const t = sheet.addRow([block.title]);
      sheet.mergeCells(`A${t.number}:D${t.number}`);
      t.font = { bold: true };
      t.getCell(1).fill = solidFill(XL.headerGrey);

      const s = sheet.addRow([block.subtitle]);
      sheet.mergeCells(`A${s.number}:D${s.number}`);
      s.font = { bold: true, size: 10 };
      s.getCell(1).fill = solidFill(XL.headerGrey);

      const head = sheet.addRow(['Sr. No', 'Due from Name', 'Amount due', 'Provision made']);
      head.font = { bold: true };
      head.alignment = { horizontal: 'center' };
      head.eachCell((c) => (c.fill = solidFill(XL.headerGrey)));

      for (const r of block.rows) {
        const row = sheet.addRow([r.srNo, r.dueFromName, r.amountDue, r.provisionMade]);
        row.getCell(3).numFmt = '#,##0.00';
        row.getCell(4).numFmt = '#,##0.00';
      }

      const note = sheet.addRow([this.sundryDebtorsNote]);
      sheet.mergeCells(`A${note.number}:D${note.number}`);
      note.font = { bold: true, size: 10 };
      note.alignment = { wrapText: true };
      boxAllCells(sheet, start, sheet.rowCount, 4);
      sheet.addRow([]);
    }

    // Details of Depositors & Borrowers
    let start = sheet.rowCount + 1;
    const dbTitle = sheet.addRow(['Details of Depositors & Borrowers', '', 'Rs. In Thousands']);
    sheet.mergeCells(`A${dbTitle.number}:B${dbTitle.number}`);
    dbTitle.font = { bold: true };
    dbTitle.eachCell((c) => (c.fill = solidFill(XL.headerGrey)));
    dbTitle.getCell(3).alignment = { horizontal: 'right' };

    for (const line of this.depositorsBorrowers) {
      const row = sheet.addRow([line.label, '', line.value]);
      sheet.mergeCells(`A${row.number}:B${row.number}`);
      row.getCell(1).alignment = { wrapText: true, vertical: 'middle', indent: line.level };
      row.getCell(3).numFmt = line.count ? '#,##0' : '#,##0.00';
      if (line.total) {
        row.font = { bold: true };
        row.getCell(3).fill = solidFill(XL.derivedBlue);
      }
    }
    boxAllCells(sheet, start, sheet.rowCount, 3);
    sheet.addRow([]);

    // Complaints
    start = sheet.rowCount + 1;
    const cTitle = sheet.addRow(['Complaints Received from public']);
    sheet.mergeCells(`A${cTitle.number}:B${cTitle.number}`);
    cTitle.font = { bold: true };
    cTitle.getCell(1).fill = solidFill(XL.headerGrey);
    for (const line of this.complaints) {
      const row = sheet.addRow([line.label, '', line.value]);
      sheet.mergeCells(`A${row.number}:B${row.number}`);
      row.getCell(1).alignment = { wrapText: true, vertical: 'middle' };
      row.getCell(3).numFmt = '#,##0';
    }
    boxAllCells(sheet, start, sheet.rowCount, 3);
  }

  private toast(msg: string): void {
    this.toastMsg = msg;
    this.toastVisible = true;
    if (this.toastTimer) {
      clearTimeout(this.toastTimer);
    }
    this.toastTimer = setTimeout(() => (this.toastVisible = false), 3200);
  }
}