/**
 * 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, ViewChild, ElementRef } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule } from '@angular/router';
import { MatTableModule } from '@angular/material/table';
import { MatButtonModule } from '@angular/material/button';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { Chart, registerables } from 'chart.js';
import { TranslateModule } from '@ngx-translate/core';
import { CfcfrmsService } from '../cfcfrms.service';
import { StatusBadgeComponent } from '../components/status-badge/status-badge.component';
import { Complaint, DashboardStats } from '../models/cfcfrms.models';

Chart.register(...registerables);

@Component({
  selector: 'mifosx-cfcfrms-dashboard',
  standalone: true,
  imports: [
    CommonModule,
    RouterModule,
    MatTableModule,
    MatButtonModule,
    MatProgressSpinnerModule,
    FaIconComponent,
    TranslateModule,
    StatusBadgeComponent
  ],
  templateUrl: './cfcfrms-dashboard.component.html',
  styleUrls: ['./cfcfrms-dashboard.component.scss']
})
export class CfcfrmsDashboardComponent implements OnInit {
  private cfcfrmsService = inject(CfcfrmsService);

  stats: DashboardStats;
  recentComplaints: Complaint[] = [];
  isLoading = true;
  displayedColumns = [
    'ticketId',
    'complainantName',
    'fraudAmount',
    'status',
    'createdAt',
    'actions'
  ];

  @ViewChild('donutCanvas') donutCanvas: ElementRef<HTMLCanvasElement>;
  @ViewChild('barCanvas') barCanvas: ElementRef<HTMLCanvasElement>;

  private donutChart: any;
  private barChart: any;

  ngOnInit(): void {
    this.loadData();
  }

  loadData(): void {
    this.isLoading = true;
    this.cfcfrmsService.getStats().subscribe({
      next: (stats) => {
        this.stats = stats;
        setTimeout(() => this.renderCharts(), 100);
      },
      error: () => {
        this.stats = {
          totalComplaints: 0,
          pendingReview: 0,
          lienMarked: 0,
          fundsRecovered: 0,
          statusDistribution: {},
          amountByStatus: {}
        };
      }
    });

    this.cfcfrmsService.getComplaints({ page: 0, size: 5 }).subscribe({
      next: (res) => {
        this.recentComplaints = res.content;
        this.isLoading = false;
      },
      error: () => {
        this.recentComplaints = [];
        this.isLoading = false;
      }
    });
  }

  private renderCharts(): void {
    if (!this.stats) return;

    const statusColors: Record<string, string> = {
      RECEIVED: '#1E88E5',
      UNDER_REVIEW: '#F59E0B',
      LIEN_MARKED: '#EAB308',
      DEBIT_FROZEN: '#EF4444',
      FUNDS_MOVED: '#8B5CF6',
      RESOLVED: '#10B981',
      REJECTED: '#6B7280'
    };

    // Donut chart
    if (this.donutCanvas) {
      const dist = this.stats.statusDistribution || {};
      const labels = Object.keys(dist);
      const data = Object.values(dist);
      const colors = labels.map((l) => statusColors[l] || '#999');

      if (this.donutChart) this.donutChart.destroy();
      this.donutChart = new Chart(this.donutCanvas.nativeElement, {
        type: 'doughnut',
        data: {
          labels: labels.map((l) => l.replace('_', ' ')),
          datasets: [{ data, backgroundColor: colors, borderWidth: 2, borderColor: '#fff' }]
        },
        options: {
          responsive: true,
          maintainAspectRatio: false,
          plugins: {
            legend: { position: 'bottom', labels: { padding: 16, font: { size: 12 } } }
          }
        }
      });
    }

    // Bar chart
    if (this.barCanvas) {
      const amt = this.stats.amountByStatus || {};
      const labels = Object.keys(amt);
      const data = Object.values(amt);
      const colors = labels.map((l) => statusColors[l] || '#999');

      if (this.barChart) this.barChart.destroy();
      this.barChart = new Chart(this.barCanvas.nativeElement, {
        type: 'bar',
        data: {
          labels: labels.map((l) => l.replace('_', ' ')),
          datasets: [{ label: 'Fraud Amount (₹)', data, backgroundColor: colors, borderRadius: 4 }]
        },
        options: {
          responsive: true,
          maintainAspectRatio: false,
          plugins: { legend: { display: false } },
          scales: {
            y: { beginAtZero: true, ticks: { callback: (v: any) => '₹' + (v / 1000).toFixed(0) + 'K' } },
            x: { ticks: { font: { size: 11 } } }
          }
        }
      });
    }
  }

  formatCurrency(amount: number): string {
    return new Intl.NumberFormat('en-IN', { style: 'currency', currency: 'INR', maximumFractionDigits: 0 }).format(
      amount
    );
  }

  formatDate(dateStr: string): string {
    return new Date(dateStr).toLocaleDateString('en-IN', { day: '2-digit', month: 'short', year: 'numeric' });
  }
}