/**
 * 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/.
 */

/** Angular Imports */
import { Component, OnInit, inject } from '@angular/core';
import { UntypedFormControl, ReactiveFormsModule } from '@angular/forms';
import { Router, RouterLink } from '@angular/router';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';
import { activities } from '../activities';
import { MatAutocompleteTrigger, MatAutocomplete, MatOption } from '@angular/material/autocomplete';
import { MatDialog } from '@angular/material/dialog';
import { MatTooltipModule } from '@angular/material/tooltip';
import { AsyncPipe, DatePipe } from '@angular/common';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
import { RbiCircularsService } from '../../rbi-circulars/rbi-circulars.service';
/**
 * Dashboard component.
 */
@Component({
  selector: 'mifosx-dashboard',
  standalone: true,
  templateUrl: './dashboard.component.html',
  styleUrls: ['./dashboard.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    MatAutocompleteTrigger,
    MatAutocomplete,
    MatTooltipModule,
    AsyncPipe,
    DatePipe,
    FaIconComponent
  ]
})
export class DashboardComponent implements OnInit {
  private router = inject(Router);
  private dialog = inject(MatDialog);
  private rbi = inject(RbiCircularsService);

  today = new Date();

  /**
   * The CRR/SLR tile, read from the return.
   *
   * The amounts and the rates were both fixed text on the template until now, so the tile reported
   * ₹2,077 Cr at 3% whatever the ledger held and whatever rate Admin was on. A dashboard figure is
   * read as the bank's position, and one that cannot move is worse than none: nothing on the tile
   * says it is a placeholder.
   *
   * Dashes until the return answers. 'status' drives the compliance tag, which is only claimed
   * where the return states it.
   */
  crrSlr: {
    crrRate: number | null;
    slrRate: number | null;
    crrRequired: string;
    slrRequired: string;
    status: 'ok' | 'short' | 'unknown';
  } = { crrRate: null, slrRate: null, crrRequired: '—', slrRequired: '—', status: 'unknown' };

  /** Array of all user activities */
  userActivity: string[];
  /** Array of most recent user activities */
  recentActivities: string[];
  /** Array of most frequent user activities */
  frequentActivities: string[];
  /** Search Text. */
  searchText: UntypedFormControl = new UntypedFormControl();
  /** Filtered Activities. */
  filteredActivities: Observable<any[]>;
  /** All User Activities. */
  allActivities: any[] = activities;

  /**
   * Gets user activities from local storage.
   */
  constructor() {
    this.userActivity = JSON.parse(localStorage.getItem('mifosXLocation')) || [];
  }

  ngOnInit() {
    this.recentActivities = this.getRecentActivities();
    this.frequentActivities = this.getFrequentActivities();
    this.setFilteredActivities();
    this.loadCrrSlr();
  }

  /** Fills the CRR/SLR tile from the return, leaving it dashed where the return cannot compute. */
  private loadCrrSlr(): void {
    const crore = (v: number | null | undefined): string =>
      v === null || v === undefined ? '—' : `₹${Math.round(v / 1e7).toLocaleString('en-IN')} Cr`;

    // The statutory Form 1, which is the return this bank files — twice a month, at the 15th and at
    // the month end. The working report's 45-day lag lands mid-fortnight, on a date the bank never
    // reported, so a tile built on it shows a position that appears on no filing.
    this.rbi.getForm1Statutory().subscribe({
      next: (data: any) => {
        const latest = (data?.columns?.length ?? 0) - 1;
        if (latest < 0) {
          return;
        }
        this.crrSlr.crrRate = data?.crrPercentage ?? null;
        this.crrSlr.slrRate = data?.slrPercentage ?? null;
        this.crrSlr.crrRequired = crore(data?.partB?.required?.[latest]);
        this.crrSlr.slrRequired = crore(data?.partC?.required?.[latest]);

        // Compliant only where BOTH ratios are met: the tile carries one tag for the pair, and a
        // bank short on SLR is not within limits because its cash reserve happens to be ample.
        const crrHeld = data?.partB?.maintained?.[latest];
        const crrNeed = data?.partB?.required?.[latest];
        const slrHeld = data?.partC?.maintained?.[latest];
        const slrNeed = data?.partC?.required?.[latest];
        if ([
            crrHeld,
            crrNeed,
            slrHeld,
            slrNeed
          ].every((v) => v !== null && v !== undefined)) {
          this.crrSlr.status = crrHeld >= crrNeed && slrHeld >= slrNeed ? 'ok' : 'short';
        }
      },
      error: () => undefined
    });
  }

  /**
   * Returns top eight recent activities.
   */
  getRecentActivities() {
    const reverseActivities = this.userActivity.reverse();
    const uniqueActivities: string[] = [];
    reverseActivities.forEach((activity: string) => {
      if (!uniqueActivities.includes(activity)) {
        uniqueActivities.push(activity);
      }
    });
    const topEightRecentActivities = uniqueActivities
      .filter(
        (activity: string) => ![
            '/',
            '/login',
            '/home',
            '/dashboard'
          ].includes(activity)
      )
      .slice(0, 8);
    return topEightRecentActivities;
  }

  /**
   * Returns top eight frequent activities.
   */
  getFrequentActivities() {
    const frequencyCounts: any = {};
    let index = this.userActivity?.length;
    while (index) {
      const activity = this.userActivity[--index];
      frequencyCounts[activity] = (frequencyCounts[activity] || 0) + 1;
    }
    const frequencyCountsArray = Object.entries(frequencyCounts);
    const topEigthFrequentActivities = frequencyCountsArray
      .sort((a: any, b: any) => b[1] - a[1])
      .map((entry: any[]) => entry[0])
      .filter(
        (activity: string) => ![
            '/',
            '/login',
            '/home',
            '/dashboard'
          ].includes(activity)
      )
      .slice(0, 8);
    return topEigthFrequentActivities;
  }

  /**
   * Navigates to the activity
   */
  navigatetoActivity(activity: string) {
    this.router.navigateByUrl(activity);
  }

  /**
   * Sets filtered activities for autocomplete.
   */
  setFilteredActivities() {
    this.filteredActivities = this.searchText.valueChanges.pipe(
      map((activity: any) => (typeof activity === 'string' ? activity : activity.activity)),
      map((activityName: string) => (activityName ? this.filterActivity(activityName) : this.allActivities))
    );
  }

  /**
   * Filters activities.
   * @param activityName Activity name to filter activity by.
   * @returns {any} Filtered activities.
   */
  private filterActivity(activityName: string): any {
    const filterValue = activityName.toLowerCase();
    return this.allActivities.filter((activity) => activity.activity.toLowerCase().indexOf(filterValue) === 0);
  }

  /**
   * Opens the CRR/SLR details dialog with full liabilities breakdown.
   */
  async openCrrSlrDialog(): Promise<void> {
    const { CrrSlrDialogComponent } = await import('./crr-slr-dialog/crr-slr-dialog.component');
    this.dialog.open(CrrSlrDialogComponent, {
      width: '95vw',
      maxWidth: '1100px',
      maxHeight: '90vh',
      panelClass: 'crr-slr-dialog-panel',
      autoFocus: false
    });
  }

  async openCrarDialog(): Promise<void> {
    const { CrarDialogComponent } = await import('./crar-dialog/crar-dialog.component');
    this.dialog.open(CrarDialogComponent, {
      width: '95vw',
      maxWidth: '1360px',
      maxHeight: '90vh',
      panelClass: 'crr-slr-dialog-panel',
      autoFocus: false
    });
  }

  async openCicDqrDialog(): Promise<void> {
    const { CicDqrDialogComponent } = await import('./cic-dqr-dialog/cic-dqr-dialog.component');
    this.dialog.open(CicDqrDialogComponent, {
      width: '88vw',
      maxWidth: '1200px',
      maxHeight: '92vh',
      panelClass: 'crr-slr-dialog-panel',
      autoFocus: false,
      disableClose: false,
      hasBackdrop: true,
      backdropClass: 'cic-dlg-backdrop'
    });
  }

  async openPslReportDialog(): Promise<void> {
    const { PslReportDialogComponent } = await import('./psl-report-dialog/psl-report-dialog.component');
    this.dialog.open(PslReportDialogComponent, {
      width: '92vw',
      maxWidth: '1280px',
      maxHeight: '92vh',
      panelClass: 'crr-slr-dialog-panel',
      autoFocus: false,
      disableClose: false,
      hasBackdrop: true,
      backdropClass: 'psl-dlg-backdrop'
    });
  }
}