/**
 * 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 { ActivatedRoute, Router } from '@angular/router';
import { FormControl, ReactiveFormsModule } from '@angular/forms';
import { NgClass } from '@angular/common';
import { MatTooltipModule } from '@angular/material/tooltip';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { forkJoin, of } from 'rxjs';
import { catchError } from 'rxjs/operators';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
import { FormatNumberPipe } from 'app/pipes/format-number.pipe';
import { OrganizationService } from 'app/organization/organization.service';

/** What each DDS transaction type is called on screen. */
const TRANSACTION_LABELS: Record<string, string> = {
  PARTY_TRAN: 'Collection',
  INTEREST_POST: 'Interest',
  OD_INTEREST_POST: 'OD Interest',
  MATURITY_PAYOUT: 'Maturity Payout',
  PREMATURE_PAYOUT: 'Premature Payout',
  PREMATURE_INT_RECOVERY: 'Interest Recovered (Premature)',
  PREMATURE_AGENT_TOP_UP: 'Interest Funded by Agent',
  WITHDRAW_DEPOSITE: 'Transfer (Withdraw Deposite)',
  TRANSFER: 'Transfer'
};

/**
 * One DDS account and everything that has moved on it, as the savings account page shows a savings
 * account: the account's terms and where it stands, then its transactions with the balance after
 * each, narrowed to a day or a range.
 *
 * Read-only. The account is changed from DDS Party Master; its money moves through collections, the
 * cashier and the batch runs.
 */
@Component({
  selector: 'mifosx-dds-account-view',
  templateUrl: './dds-account-view.component.html',
  styleUrls: ['./dds-account-view.component.scss'],
  standalone: true,
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    ReactiveFormsModule,
    NgClass,
    FaIconComponent,
    MatTooltipModule,
    MatProgressSpinnerModule,
    FormatNumberPipe
  ]
})
export class DdsAccountViewComponent implements OnInit {
  private route = inject(ActivatedRoute);
  private router = inject(Router);
  private organizationService = inject(OrganizationService);

  isLoading = true;
  account: any = null;
  private transactions: any[] = [];

  /** The page's tabs, as the savings account page has them - only those that apply to DDS. */
  tab: 'general' | 'transactions' | 'passbook' | 'nominees' | 'closure' = 'general';

  /** How a closed account was closed - read only for closed accounts, for the Closure tab. */
  closure: any = null;

  /** What each kind of closure is called on screen. */
  readonly closureLabels: Record<string, string> = {
    PREMATURE: 'Premature Close',
    MATURITY_PAYOUT_AND_CLOSE: 'Maturity Payout & Close',
    MATURITY_PAYOUT_THEN_CLOSE: 'Maturity Payout, then Closed',
    MATURITY_AUTO_CLOSE: 'Maturity Auto Close (night job)',
    CLOSED_NIL_BALANCE: 'Closed with nil balance'
  };

  /** The passbook reads oldest first, as it is written up. */
  get passbookEntries(): any[] {
    return [...this.shownTransactions].reverse();
  }

  /** The balance after the last entry shown. */
  get passbookClosingBalance(): number {
    const entries = this.passbookEntries;
    return entries.length > 0 ? Number(entries[entries.length - 1].balanceAfterTransaction || 0) : 0;
  }

  /**
   * Prints the passbook alone. It is copied into a window of its own with only its own styles, so the
   * page's menus, banner and tabs do not come out on the paper.
   */
  printPassbook(): void {
    const passbook = document.getElementById('dds-passbook');
    const popup = window.open('', '_blank', 'width=900,height=700');
    if (!passbook || !popup) {
      return;
    }
    popup.document.write(`<html><head><title>${this.account?.accountNo || 'DDS'} Passbook</title><style>
      body { font-family: Arial, sans-serif; margin: 24px; color: #111; }
      .dav-pb-head { display: flex; justify-content: space-between; gap: 24px; margin-bottom: 16px; }
      .dav-pb-title { font-size: 20px; font-weight: 700; }
      .dav-pb-sub { color: #555; }
      .dav-pb-grid { display: grid; grid-template-columns: auto auto; gap: 2px 12px; font-size: 13px; }
      .dav-pb-grid span { color: #555; }
      table { width: 100%; border-collapse: collapse; font-size: 13px; }
      th, td { border: 1px solid #999; padding: 6px 8px; text-align: left; }
      .dav-right { text-align: right; }
      .dav-pb-note { display: block; font-size: 11px; color: #555; }
    </style></head><body>${passbook.innerHTML}</body></html>`);
    popup.document.close();
    popup.focus();
    popup.print();
  }

  fromDateControl = new FormControl('');
  toDateControl = new FormControl('');

  readonly today = new Date().toISOString().split('T')[0];

  ngOnInit(): void {
    const partyId = this.route.snapshot.paramMap.get('partyId');
    if (!partyId) {
      this.isLoading = false;
      return;
    }
    forkJoin({
      account: this.organizationService.getParty(partyId).pipe(catchError(() => of(null))),
      transactions: this.organizationService.getPartyTransactionsOfParty(partyId).pipe(catchError(() => of([])))
    }).subscribe(({ account, transactions }) => {
      this.account = account;
      if (account?.status === 'CLOSED') {
        this.organizationService.getPartyClosure(partyId).subscribe({
          next: (closure: any) => (this.closure = closure),
          error: () => (this.closure = null)
        });
      }
      // Newest first, and within a day the later entry first - the order a passbook is read back in.
      this.transactions = (Array.isArray(transactions) ? transactions : []).sort(
        (a: any, b: any) =>
          String(b.transactionDate).localeCompare(String(a.transactionDate)) || Number(b.id) - Number(a.id)
      );
      this.isLoading = false;
    });
  }

  /** The transactions in the chosen range - all of them when no range is set. */
  get shownTransactions(): any[] {
    const from = this.fromDateControl.value;
    const to = this.toDateControl.value;
    return this.transactions.filter((txn: any) => {
      const day = String(txn.transactionDate || '');
      if (from && day < String(from)) {
        return false;
      }
      if (to && day > String(to)) {
        return false;
      }
      return true;
    });
  }

  get totalCredits(): number {
    return this.sumOf('CREDIT');
  }

  get totalDebits(): number {
    return this.sumOf('DEBIT');
  }

  private sumOf(direction: string): number {
    return this.shownTransactions
      .filter((txn: any) => txn.direction === direction)
      .reduce((sum: number, txn: any) => sum + Number(txn.amount || 0), 0);
  }

  /** Everything of one type ever credited, whatever the date filter says - for the summary cards. */
  totalOf(type: string): number {
    return this.transactions
      .filter((txn: any) => txn.transactionType === type && txn.direction === 'CREDIT')
      .reduce((sum: number, txn: any) => sum + Number(txn.amount || 0), 0);
  }

  /** Interest credited, less any taken back on an early closure. */
  get interestEarned(): number {
    const recovered = this.transactions
      .filter((txn: any) => txn.transactionType === 'PREMATURE_INT_RECOVERY')
      .reduce((sum: number, txn: any) => sum + Number(txn.amount || 0), 0);
    return (
      this.totalOf('INTEREST_POST') +
      this.totalOf('OD_INTEREST_POST') +
      this.totalOf('PREMATURE_AGENT_TOP_UP') -
      recovered
    );
  }

  /** Money that has left the account - payouts, withdrawals, transfers out. */
  get totalDebitsAll(): number {
    return this.transactions
      .filter((txn: any) => txn.direction === 'DEBIT' && txn.transactionType !== 'PREMATURE_INT_RECOVERY')
      .reduce((sum: number, txn: any) => sum + Number(txn.amount || 0), 0);
  }

  get lastTransactionDate(): string | null {
    return this.transactions.length > 0 ? this.transactions[0].transactionDate : null;
  }

  /** The rows on screen, as a spreadsheet the branch can keep or send on. */
  exportCsv(): void {
    const header = [
      '#',
      'ID',
      'Transaction Date',
      'Transaction Type',
      'Voucher',
      'Description',
      'Account',
      'Debit',
      'Credit',
      'Balance'
    ];
    const quote = (value: any) => `"${String(value ?? '').replace(/"/g, '""')}"`;
    const lines = this.shownTransactions.map((txn: any, index: number) =>
      [
        index + 1,
        txn.id,
        txn.transactionDate,
        this.label(txn.transactionType),
        txn.voucherNo,
        txn.description,
        txn.accountNo,
        txn.direction === 'DEBIT' ? txn.amount : '',
        txn.direction === 'CREDIT' ? txn.amount : '',
        txn.balanceAfterTransaction
      ]
        .map(quote)
        .join(',')
    );
    const blob = new Blob(
      [[
          header.map(quote).join(','),
          ...lines
        ].join('\r\n')],
      { type: 'text/csv;charset=utf-8' }
    );
    const link = document.createElement('a');
    link.href = URL.createObjectURL(blob);
    link.download = `${this.account?.accountNo || 'dds-account'}-transactions.csv`;
    link.click();
    URL.revokeObjectURL(link.href);
  }

  get hasDateFilters(): boolean {
    return !!(this.fromDateControl.value || this.toDateControl.value);
  }

  showToday(): void {
    this.fromDateControl.setValue(this.today);
    this.toDateControl.setValue(this.today);
  }

  clearDateFilters(): void {
    this.fromDateControl.setValue('');
    this.toDateControl.setValue('');
  }

  label(type: string): string {
    return TRANSACTION_LABELS[type] || String(type || '').replace(/_/g, ' ');
  }

  statusClass(): string {
    switch (this.account?.status) {
      case 'ACTIVE':
        return 'status--active';
      case 'CLOSED':
        return 'status--closed';
      default:
        return 'status--default';
    }
  }

  back(): void {
    this.router.navigate(['/accounts/dds-accounts']);
  }

  openInPartyMaster(): void {
    this.router.navigate([
      '/accounts/dds',
      this.account.id,
      'edit'
    ]);
  }
}