/**
 * 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, OnDestroy, ViewChild, inject } from '@angular/core';
import { ActivatedRoute, Router } from '@angular/router';
import { FormControl, ReactiveFormsModule } from '@angular/forms';
import { MatPaginator, PageEvent } from '@angular/material/paginator';
import { MatSort, MatSortHeader, Sort } from '@angular/material/sort';
import {
  MatTableDataSource,
  MatTable,
  MatColumnDef,
  MatHeaderCellDef,
  MatHeaderCell,
  MatCellDef,
  MatCell,
  MatHeaderRowDef,
  MatHeaderRow,
  MatRowDef,
  MatRow
} from '@angular/material/table';
import { Subject, merge } from 'rxjs';
import { debounceTime, distinctUntilChanged, takeUntil } from 'rxjs/operators';
import { NgClass } from '@angular/common';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { MatTooltipModule } from '@angular/material/tooltip';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { FormatNumberPipe } from '../../pipes/format-number.pipe';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
import { AccountsService } from '../accounts.service';

export type AccountType = 'savings' | 'current' | 'fixed-deposits' | 'recurring-deposits';

interface AccountConfig {
  label: string;
  icon: string;
  accentClass: string;
  typeLabel: string;
  typeBadgeClass: string;
}

@Component({
  selector: 'mifosx-accounts-list',
  templateUrl: './accounts-list.component.html',
  styleUrls: ['./accounts-list.component.scss'],
  standalone: true,
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    ReactiveFormsModule,
    FaIconComponent,
    MatTable,
    MatSort,
    MatSortHeader,
    MatColumnDef,
    MatHeaderCellDef,
    MatHeaderCell,
    MatCellDef,
    MatCell,
    MatHeaderRowDef,
    MatHeaderRow,
    MatRowDef,
    MatRow,
    MatPaginator,
    NgClass,
    MatTooltipModule,
    MatProgressSpinnerModule,
    FormatNumberPipe
  ]
})
export class AccountsListComponent implements OnInit, OnDestroy {
  private route = inject(ActivatedRoute);
  private router = inject(Router);
  private accountsService = inject(AccountsService);
  private destroy$ = new Subject<void>();

  accountType: AccountType = 'savings';
  displayedColumns = [
    'accountNo',
    'depositType',
    'clientName',
    'productName',
    'balance',
    'status',
    'actions'
  ];
  dataSource = new MatTableDataSource<any>([]);

  totalRecords = 0;
  pageSize = 20;
  pageIndex = 0;
  isLoading = false;

  searchControl = new FormControl('');
  searchType: 'accountNo' | 'clientName' = 'accountNo';
  fromDateControl = new FormControl('');
  toDateControl = new FormControl('');
  asOnDateControl = new FormControl('');

  @ViewChild(MatPaginator) paginator!: MatPaginator;
  @ViewChild(MatSort) sort!: MatSort;

  readonly configs: Record<AccountType, AccountConfig> = {
    savings: {
      label: 'Savings Accounts',
      icon: 'piggy-bank',
      accentClass: 'accent--saving',
      typeLabel: 'SB',
      typeBadgeClass: 'dtype--sb'
    },
    current: {
      label: 'Current Accounts',
      icon: 'building',
      accentClass: 'accent--current',
      typeLabel: 'CA',
      typeBadgeClass: 'dtype--ca'
    },
    'fixed-deposits': {
      label: 'Fixed Deposit Accounts',
      icon: 'lock',
      accentClass: 'accent--fd',
      typeLabel: 'FD',
      typeBadgeClass: 'dtype--fd'
    },
    'recurring-deposits': {
      label: 'Recurring Deposit Accounts',
      icon: 'sync',
      accentClass: 'accent--rd',
      typeLabel: 'RD',
      typeBadgeClass: 'dtype--rd'
    }
  };

  get config(): AccountConfig {
    return this.configs[this.accountType];
  }

  ngOnInit() {
    this.route.data.pipe(takeUntil(this.destroy$)).subscribe((data) => {
      this.accountType = data['accountType'] as AccountType;
      this.pageIndex = 0;
      this.searchControl.setValue('', { emitEvent: false });
      this.loadAccounts();
    });

    this.searchControl.valueChanges
      .pipe(debounceTime(300), distinctUntilChanged(), takeUntil(this.destroy$))
      .subscribe(() => {
        this.pageIndex = 0;
        this.loadAccounts();
      });

    merge(this.fromDateControl.valueChanges, this.toDateControl.valueChanges)
      .pipe(debounceTime(400), takeUntil(this.destroy$))
      .subscribe(() => {
        const from = this.fromDateControl.value;
        const to = this.toDateControl.value;
        if ((from && to) || (!from && !to)) {
          this.pageIndex = 0;
          this.loadAccounts();
        }
      });

    this.asOnDateControl.valueChanges.pipe(debounceTime(300), takeUntil(this.destroy$)).subscribe(() => {
      this.pageIndex = 0;
      this.loadAccounts();
    });
  }

  ngOnDestroy() {
    this.destroy$.next();
    this.destroy$.complete();
  }

  loadAccounts() {
    this.isLoading = true;
    const search = (this.searchControl.value || '').trim();
    const fromVal = this.fromDateControl.value;
    const toVal = this.toDateControl.value;
    const bothDatesSet = !!(fromVal && toVal);

    const params: import('../accounts.service').AccountListParams = {
      offset: this.pageIndex * this.pageSize,
      limit: this.pageSize,
      accountNo: this.searchType === 'accountNo' ? search || undefined : undefined,
      clientName: this.searchType === 'clientName' ? search || undefined : undefined,
      orderBy: 'id',
      sortOrder: 'DESC',
      status: 'active',
      ...(bothDatesSet && { fromDate: fromVal! }),
      ...(bothDatesSet && { toDate: toVal! }),
      ...(this.asOnDateControl.value && { asOnDate: this.asOnDateControl.value })
    };

    const obs$ =
      this.accountType === 'savings'
        ? this.accountsService.getSavingsAccounts(params)
        : this.accountType === 'current'
          ? this.accountsService.getCurrentAccounts(params)
          : this.accountType === 'fixed-deposits'
            ? this.accountsService.getFixedDepositAccounts(params)
            : this.accountsService.getRecurringDepositAccounts(params);

    obs$.pipe(takeUntil(this.destroy$)).subscribe({
      next: (res) => {
        let items: any[] = Array.isArray(res) ? res : (res?.pageItems ?? []);

        if (this.accountType === 'savings') {
          items = items.filter((a: any) => a?.depositType?.id === 100);
        }

        items = items.filter((a: any) => (a?.status?.id ?? a?.statusId) === 300);

        const searchTerm = search.toLowerCase();

        if (searchTerm) {
          items = items.filter((a: any) =>
            this.searchType === 'accountNo'
              ? (a?.accountNo || '').toLowerCase().includes(searchTerm)
              : (a?.clientName || '').toLowerCase().includes(searchTerm)
          );
        }

        if (bothDatesSet || this.asOnDateControl.value) {
          const fromDate = bothDatesSet ? new Date(fromVal!) : null;
          const toDate = bothDatesSet ? new Date(toVal! + 'T23:59:59') : null;
          const asOnDate = this.asOnDateControl.value ? new Date(this.asOnDateControl.value + 'T23:59:59') : null;
          items = items.filter((a: any) => {
            const d = this.parseFinDate(a?.activationDate ?? a?.submittedOnDate);
            if (!d) return true;
            if (fromDate && d < fromDate) return false;
            if (toDate && d > toDate) return false;
            if (asOnDate && d > asOnDate) return false;
            return true;
          });
        }

        this.totalRecords = Array.isArray(res) ? items.length : (res?.totalFilteredRecords ?? items.length);
        this.dataSource.data = items;
        this.isLoading = false;
      },
      error: () => {
        this.isLoading = false;
      }
    });
  }

  onPageChange(event: PageEvent) {
    this.pageIndex = event.pageIndex;
    this.pageSize = event.pageSize;
    this.loadAccounts();
  }

  private parseFinDate(d: any): Date | null {
    if (!d) return null;
    if (Array.isArray(d) && d.length >= 3) return new Date(d[0], d[1] - 1, d[2]);
    if (typeof d === 'string') return new Date(d);
    return null;
  }

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

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

  clearDateFilters() {
    this.fromDateControl.setValue(null, { emitEvent: false });
    this.toDateControl.setValue(null, { emitEvent: false });
    this.asOnDateControl.setValue(null, { emitEvent: false });
    this.pageIndex = 0;
    this.loadAccounts();
  }

  onSortChange(_sort: Sort) {
    this.pageIndex = 0;
    this.loadAccounts();
  }

  toggleSearchType() {
    this.searchType = this.searchType === 'accountNo' ? 'clientName' : 'accountNo';
    if (this.searchControl.value) this.loadAccounts();
  }

  clearSearch() {
    this.searchControl.setValue('');
  }

  viewAccount(account: any) {
    const id = account.id;
    const routes: Record<AccountType, string[]> = {
      savings: [
        '/clients',
        account.clientId,
        'savings-accounts',
        id,
        'general'
      ],
      current: [
        '/clients',
        account.clientId,
        'current-accounts',
        id,
        'general'
      ],
      'fixed-deposits': [
        '/clients',
        account.clientId,
        'fixed-deposits-accounts',
        id,
        'general'
      ],
      'recurring-deposits': [
        '/clients',
        account.clientId,
        'recurring-deposits-accounts',
        id,
        'general'
      ]
    };
    this.router.navigate(routes[this.accountType]);
  }

  getBalance(account: any): number {
    return account?.summary?.accountBalance ?? account?.accountBalance ?? 0;
  }

  getCurrencySymbol(account: any): string {
    return account?.currency?.displaySymbol || account?.currency?.code || '₹';
  }

  getStatusClass(account: any): string {
    const id = account?.status?.id ?? account?.statusId;
    const map: Record<number, string> = {
      100: 'status--submitted',
      200: 'status--approved',
      300: 'status--active',
      400: 'status--withdrawn',
      500: 'status--rejected',
      600: 'status--closed'
    };
    return map[id] ?? 'status--default';
  }

  getStatusLabel(account: any): string {
    return account?.status?.value ?? account?.statusValue ?? 'Unknown';
  }
}