/**
 * 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, ElementRef, OnDestroy, OnInit, ViewChild, inject } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { UntypedFormBuilder, UntypedFormGroup, Validators } from '@angular/forms';
import { MatButtonModule } from '@angular/material/button';
import { MatTableModule } from '@angular/material/table';
import { MatPaginatorModule, PageEvent } from '@angular/material/paginator';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import lightGallery from 'lightgallery';
import lgZoom from 'lightgallery/plugins/zoom';
import lgFullscreen from 'lightgallery/plugins/fullscreen';
import type { LightGallery } from 'lightgallery/lightgallery';
import type { GalleryItem } from 'lightgallery/lg-utils';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';

/** Custom Services */
import { CtsClearingService } from '../ctsclearing.service';
import { ClearingService } from '../../clearing-network/clearing.service';
import { pillClass, clearingError } from '../../clearing-network/clearing-status';

/**
 * One outward clearing session ("batch") — every cheque sent to NPCI sharing this batchReference. Settle /
 * dishonour and image viewing work exactly as on the Outward Clearing screen; this view is scoped to a
 * single session instead of showing every cheque ever captured.
 */
@Component({
  selector: 'mifosx-outward-batch-detail',
  templateUrl: './outward-batch-detail.component.html',
  styleUrls: ['./outward-batch-detail.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    MatButtonModule,
    MatTableModule,
    MatPaginatorModule,
    MatSnackBarModule
  ]
})
export class OutwardBatchDetailComponent implements OnInit, OnDestroy {
  private route = inject(ActivatedRoute);
  private ctsService = inject(CtsClearingService);
  private formBuilder = inject(UntypedFormBuilder);
  private clearingService = inject(ClearingService);
  private snackBar = inject(MatSnackBar);

  @ViewChild('lightboxRoot', { static: true }) lightboxRoot: ElementRef<HTMLElement>;
  private lightboxInstance: LightGallery | null = null;
  private readonly lightboxPlugins = [
    lgZoom,
    lgFullscreen
  ];

  pillClass = pillClass;

  private notify(message: string, isError = false): void {
    this.snackBar.open(message, 'Dismiss', { duration: isError ? 6000 : 3000 });
  }

  batchReference!: string;
  presentments: any[] = [];
  busy = false;
  dishonourForId: number | null = null;
  shownEnvelopeId: number | null = null;
  reasonCodes: any[] = [];

  totalRecords = 0;
  pageSize = 10;
  pageIndex = 0;
  pageSizeOptions = [
    10,
    25,
    50,
    100
  ];
  statusFilter = '';

  dishonourForm: UntypedFormGroup;
  filterForm: UntypedFormGroup;

  columns = [
    'id',
    'chequeNumber',
    'drawerBank',
    'payeeName',
    'amount',
    'image',
    'status',
    'actions'
  ];

  constructor() {
    this.dishonourForm = this.formBuilder.group({
      dishonourReasonCode: [
        '',
        Validators.required
      ]
    });
    this.filterForm = this.formBuilder.group({
      chequeNumber: [''],
      drawerBankName: [''],
      payeeName: ['']
    });
  }

  ngOnInit(): void {
    this.batchReference = this.route.snapshot.paramMap.get('id') as string;
    this.loadAll();
    this.clearingService.getReturnReasonCodes('CTS').subscribe((res: any) => {
      const list = res?.pageItems ?? (Array.isArray(res) ? res : []);
      this.reasonCodes = list.filter((c: any) => c.active !== false);
    });
  }

  ngOnDestroy(): void {
    this.destroyLightbox();
  }

  /** Cheque image data URLs, keyed "<presentmentId>_<side>" — populated once fetched. */
  imageUrls: { [key: string]: string } = {};

  loadAll(): void {
    const f = this.filterForm.value;
    const filters = {
      batchReference: this.batchReference,
      chequeNumber: f.chequeNumber || undefined,
      drawerBankName: f.drawerBankName || undefined,
      payeeName: f.payeeName || undefined
    };
    this.ctsService
      .getOutwardPresentments(this.statusFilter || undefined, this.pageIndex * this.pageSize, this.pageSize, filters)
      .subscribe((res: any) => {
        this.presentments = res?.pageItems ?? (Array.isArray(res) ? res : []);
        this.totalRecords = Number(res?.totalFilteredRecords ?? this.presentments.length);
        this.presentments.forEach((p: any) => {
          this.loadItemImage(p, 'front');
          this.loadItemImage(p, 'back');
        });
      });
  }

  filterByStatus(status: string): void {
    this.statusFilter = this.statusFilter === status ? '' : status;
    this.pageIndex = 0;
    this.loadAll();
  }

  applyFilters(): void {
    this.pageIndex = 0;
    this.loadAll();
  }

  clearFilters(): void {
    this.filterForm.reset({ chequeNumber: '', drawerBankName: '', payeeName: '' });
    this.pageIndex = 0;
    this.loadAll();
  }

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

  /** Fetches the image as an authenticated base64 data URL and caches it — 404 (no upload yet) is expected and silent. */
  loadItemImage(presentment: any, side: 'front' | 'back'): void {
    this.ctsService.getOutwardPresentmentImage(presentment.id, side).subscribe({
      next: (dataUrl: string) => (this.imageUrls[`${presentment.id}_${side}`] = dataUrl),
      error: () => {
        /* no image uploaded for this side yet */
      }
    });
  }

  getItemImageUrl(presentment: any, side: 'front' | 'back'): string | null {
    return this.imageUrls[`${presentment.id}_${side}`] || null;
  }

  /** Opens the front/back cheque image(s) in a zoomable, pannable lightbox — same lightgallery setup used app-wide. */
  openImageZoom(presentment: any, side: 'front' | 'back'): void {
    const frontUrl = this.getItemImageUrl(presentment, 'front');
    const backUrl = this.getItemImageUrl(presentment, 'back');
    const items: GalleryItem[] = [];
    if (frontUrl) {
      items.push({
        src: frontUrl,
        thumb: frontUrl,
        subHtml: `<div class="lg-caption"><h4>Front — Cheque ${presentment.chequeNumber}</h4></div>`
      });
    }
    if (backUrl) {
      items.push({
        src: backUrl,
        thumb: backUrl,
        subHtml: `<div class="lg-caption"><h4>Back — Cheque ${presentment.chequeNumber}</h4></div>`
      });
    }
    if (!items.length) {
      return;
    }
    const startIndex = side === 'back' && frontUrl ? 1 : 0;
    this.destroyLightbox();
    this.lightboxInstance = lightGallery(this.lightboxRoot.nativeElement, {
      dynamic: true,
      dynamicEl: items,
      plugins: this.lightboxPlugins,
      download: false,
      closable: true,
      escKey: true,
      zoomFromOrigin: true
    });
    this.lightboxInstance.openGallery(startIndex);
  }

  private destroyLightbox(): void {
    if (this.lightboxInstance) {
      this.lightboxInstance.destroy();
      this.lightboxInstance = null;
    }
  }

  act(presentment: any, command: string): void {
    if (this.busy) {
      return;
    }
    this.busy = true;
    const messages: any = {
      settle: 'Presentment settled',
      dishonour: 'Presentment dishonoured'
    };
    this.ctsService.actOnOutwardPresentment(presentment.id, command, { locale: 'en' }).subscribe({
      next: () => {
        this.busy = false;
        this.notify(messages[command] || 'Done');
        this.loadAll();
      },
      error: (err: any) => {
        this.busy = false;
        this.notify(clearingError(err, 'Action failed'), true);
      }
    });
  }

  toggleDishonour(presentment: any): void {
    this.dishonourForId = this.dishonourForId === presentment.id ? null : presentment.id;
    this.dishonourForm.reset();
  }

  submitDishonour(id: number): void {
    if (this.dishonourForm.invalid || this.busy) {
      return;
    }
    this.busy = true;
    const payload = { dishonourReasonCode: this.dishonourForm.value.dishonourReasonCode, locale: 'en' };
    this.ctsService.actOnOutwardPresentment(id, 'dishonour', payload).subscribe({
      next: () => {
        this.busy = false;
        this.dishonourForId = null;
        this.notify('Presentment dishonoured');
        this.loadAll();
      },
      error: (err: any) => {
        this.busy = false;
        this.notify(clearingError(err, 'Dishonour failed'), true);
      }
    });
  }

  toggleEnvelope(presentment: any): void {
    this.shownEnvelopeId = this.shownEnvelopeId === presentment.id ? null : presentment.id;
  }

  prettyJson(value: string): string {
    if (!value) {
      return '';
    }
    try {
      return JSON.stringify(JSON.parse(value), null, 2);
    } catch {
      return value;
    }
  }
}