/**
 * 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 { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { Router, RouterModule } from '@angular/router';
import { MatIconModule } from '@angular/material/icon';
import { MatPaginatorModule, PageEvent } from '@angular/material/paginator';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatNativeDateModule } from '@angular/material/core';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatDatepickerModule } from '@angular/material/datepicker';
import { catchError } from 'rxjs/operators';
import { of } from 'rxjs';

import { ClerkWithdrawalService } from '../../../cashier/clerk-withdrawal.service';
import { SettingsService } from '../../../settings/settings.service';

@Component({
  selector: 'mifosx-withdrawal-requests',
  templateUrl: './withdrawal-requests.component.html',
  styleUrls: ['./withdrawal-requests.component.scss'],
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    RouterModule,
    MatIconModule,
    MatPaginatorModule,
    MatSnackBarModule,
    MatNativeDateModule,
    MatFormFieldModule,
    MatInputModule,
    MatDatepickerModule
  ]
})
export class WithdrawalRequestsComponent implements OnInit {
  private service = inject(ClerkWithdrawalService);
  private router = inject(Router);
  private snackBar = inject(MatSnackBar);
  private settingsService = inject(SettingsService);

  requests: any[] = [];
  totalRecords = 0;
  pageSize = 20;
  pageIndex = 0;
  pageSizeOptions = [
    10,
    20,
    50
  ];

  filterStatus = 'PENDING';
  fromDate: Date | null = null;
  toDate: Date | null = null;
  maxDate!: Date;
  activePreset: string = 'today';
  loading = false;
  loaded = false;
  searchTerm = '';
  private searchDebounce: ReturnType<typeof setTimeout> | null = null;

  readonly datePresets = [
    { key: 'today', label: 'Today' },
    { key: 'week', label: 'This Week' },
    { key: 'month', label: 'This Month' },
    { key: 'all', label: 'All' }
  ];

  get statusOptions(): { value: string; label: string }[] {
    return [
      { value: 'PENDING', label: 'Pending' },
      { value: 'APPROVED', label: 'Approved' },
      { value: 'REJECTED', label: 'Rejected' },
      { value: 'WITHDRAWN', label: 'Withdrawn' }
    ];
  }

  ngOnInit(): void {
    const today = new Date(this.settingsService.businessDate);
    today.setHours(0, 0, 0, 0);
    this.maxDate = today;
    // A pending request must never be hidden by date: submitted_at is wall-clock time, and the business
    // date "today" can lag it, so opening on Today showed an empty queue. Open on All instead.
    this.applyPreset('all');
  }

  load(): void {
    this.loading = true;
    this.service
      .getPendingRequests(
        this.filterStatus,
        this.pageIndex * this.pageSize,
        this.pageSize,
        this.isoDate(this.fromDate),
        this.isoDate(this.toDate),
        this.searchTerm.trim() || undefined
      )
      .pipe(catchError(() => of({ pageItems: [], totalFilteredRecords: 0 })))
      .subscribe((res: any) => {
        this.requests = res?.pageItems ?? [];
        this.totalRecords = Number(res?.totalFilteredRecords ?? 0);
        this.loading = false;
        this.loaded = true;
      });
  }

  onSearchChange(): void {
    if (this.searchDebounce) {
      clearTimeout(this.searchDebounce);
    }
    this.searchDebounce = setTimeout(() => {
      this.pageIndex = 0;
      this.load();
    }, 300);
  }

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

  onFilterChange(): void {
    this.pageIndex = 0;
    this.load();
  }

  onFromDateChange(): void {
    this.activePreset = '';
    if (this.fromDate && this.toDate && this.fromDate > this.toDate) {
      this.toDate = new Date(this.fromDate);
    }
    this.pageIndex = 0;
    this.load();
  }

  onToDateChange(): void {
    this.activePreset = '';
    this.pageIndex = 0;
    this.load();
  }

  applyPreset(key: string): void {
    this.activePreset = key;
    const today = new Date(this.settingsService.businessDate);
    today.setHours(0, 0, 0, 0);
    if (key === 'today') {
      this.fromDate = new Date(today);
      this.toDate = new Date(today);
    } else if (key === 'week') {
      const start = new Date(today);
      start.setDate(today.getDate() - today.getDay());
      this.fromDate = start;
      this.toDate = new Date(today);
    } else if (key === 'month') {
      this.fromDate = new Date(today.getFullYear(), today.getMonth(), 1);
      this.toDate = new Date(today);
    } else {
      this.fromDate = null;
      this.toDate = null;
    }
    this.pageIndex = 0;
    this.load();
  }

  private isoDate(d: Date | null): string | undefined {
    if (!d) return undefined;
    const y = d.getFullYear();
    const m = String(d.getMonth() + 1).padStart(2, '0');
    const day = String(d.getDate()).padStart(2, '0');
    return `${y}-${m}-${day}`;
  }

  review(req: any): void {
    this.router.navigate([
      '/checker-inbox-and-tasks/withdrawal-requests',
      req.id,
      'review'
    ]);
  }

  statusClass(status: string): string {
    const map: Record<string, string> = {
      PENDING: 'wri-status--pending',
      APPROVED: 'wri-status--approved',
      REJECTED: 'wri-status--rejected',
      WITHDRAWN: 'wri-status--disbursed'
    };
    return map[status] ?? '';
  }

  statusLabel(status: string): string {
    const map: Record<string, string> = {
      PENDING: 'Pending',
      APPROVED: 'Approved',
      REJECTED: 'Rejected',
      WITHDRAWN: 'Withdrawn'
    };
    return map[status] ?? status;
  }

  formatDate(val: any): string {
    if (!val) return '—';
    try {
      const d = new Date(val);
      return d.toLocaleDateString('en-IN', { day: '2-digit', month: 'short', year: 'numeric' });
    } catch {
      return String(val);
    }
  }

  formatDateTime(val: any): string {
    if (!val) return '—';
    try {
      const d = new Date(val);
      return d.toLocaleString('en-IN', {
        day: '2-digit',
        month: 'short',
        year: 'numeric',
        hour: '2-digit',
        minute: '2-digit'
      });
    } catch {
      return String(val);
    }
  }
}