/**
 * 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, OnDestroy, inject } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { Subject, takeUntil, catchError, of } from 'rxjs';

/** Custom Services */
import { ClientsService } from '../../clients.service';
import { AlertService } from 'app/core/alert/alert.service';
import { MatIcon } from '@angular/material/icon';
import { MatProgressSpinner } from '@angular/material/progress-spinner';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';

@Component({
  selector: 'mifosx-ckyc-tab',
  templateUrl: './ckyc-tab.component.html',
  styleUrls: ['./ckyc-tab.component.scss'],
  standalone: true,
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    MatIcon,
    MatProgressSpinner,
    FaIconComponent
  ]
})
export class CkycTabComponent implements OnInit, OnDestroy {
  private route = inject(ActivatedRoute);
  private clientsService = inject(ClientsService);
  private alertService = inject(AlertService);

  private destroy$ = new Subject<void>();

  /** Top section - read-only client info */
  clientId: string;
  clientName: string = '';
  allAccounts: any[] = [];
  selectedAccount: any = null;
  selectedAccountType: string = '';

  /** State */
  loading = true;
  ckycData: any = null;

  /** File references */
  addressProofFile: File | null = null;
  photoProofFile: File | null = null;
  clientImageFile: File | null = null;
  clientSignatureFile: File | null = null;

  /** Per-document upload state */
  uploading: { [key: string]: boolean } = {
    ADDRESS_PROOF: false,
    PHOTO_PROOF: false,
    CLIENT_IMAGE: false,
    CLIENT_SIGNATURE: false
  };

  /** Per-document upload response */
  uploadResponses: { [key: string]: any } = {};

  /** Per-document error messages */
  uploadErrors: { [key: string]: string | null } = {
    ADDRESS_PROOF: null,
    PHOTO_PROOF: null,
    CLIENT_IMAGE: null,
    CLIENT_SIGNATURE: null
  };

  ngOnInit(): void {
    this.route.parent.params.subscribe((params: any) => {
      this.clientId = params['clientId'];
      this.loadClientInfo();
      this.loadAccounts();
      this.loadCkycData();
    });
  }

  private loadClientInfo(): void {
    this.route.parent.data.subscribe((data: any) => {
      if (data?.clientViewData) {
        this.clientName = data.clientViewData.displayName || '';
      }
    });
  }

  private loadAccounts(): void {
    this.clientsService
      .getClientAccountData(this.clientId)
      .pipe(
        takeUntil(this.destroy$),
        catchError(() => of(null))
      )
      .subscribe((data: any) => {
        if (data) {
          const savings = (data.savingsAccounts || []).map((a: any) => ({
            accountNo: a.accountNo,
            accountType: 'Savings',
            productName: a.productName || '',
            id: a.id
          }));
          const loans = (data.loanAccounts || []).map((a: any) => ({
            accountNo: a.accountNo,
            accountType: 'Loan',
            productName: a.productName || '',
            id: a.id
          }));
          this.allAccounts = [
            ...savings,
            ...loans
          ];
        }
      });
  }

  private loadCkycData(): void {
    this.loading = true;
    this.clientsService
      .getClientCkyc(this.clientId)
      .pipe(
        takeUntil(this.destroy$),
        catchError(() => {
          this.loading = false;
          return of(null);
        })
      )
      .subscribe((data: any) => {
        this.loading = false;
        this.ckycData = data;
      });
  }

  onAccountSelect(accountNo: string): void {
    this.selectedAccount = this.allAccounts.find((a) => a.accountNo === accountNo) || null;
    this.selectedAccountType = this.selectedAccount?.accountType || '';
  }

  onFileSelect(event: any, documentType: string): void {
    const file = event.target?.files?.[0];
    if (!file) return;

    switch (documentType) {
      case 'ADDRESS_PROOF':
        this.addressProofFile = file;
        break;
      case 'PHOTO_PROOF':
        this.photoProofFile = file;
        break;
      case 'CLIENT_IMAGE':
        this.clientImageFile = file;
        break;
      case 'CLIENT_SIGNATURE':
        this.clientSignatureFile = file;
        break;
    }
    this.uploadErrors[documentType] = null;
  }

  getFile(documentType: string): File | null {
    switch (documentType) {
      case 'ADDRESS_PROOF':
        return this.addressProofFile;
      case 'PHOTO_PROOF':
        return this.photoProofFile;
      case 'CLIENT_IMAGE':
        return this.clientImageFile;
      case 'CLIENT_SIGNATURE':
        return this.clientSignatureFile;
      default:
        return null;
    }
  }

  uploadDocument(documentType: string): void {
    const file = this.getFile(documentType);
    if (!file) return;

    this.uploading[documentType] = true;
    this.uploadErrors[documentType] = null;

    const formData = new FormData();
    formData.append('file', file);
    formData.append('documentType', documentType);

    this.clientsService
      .uploadCkycDocument(this.clientId, formData)
      .pipe(takeUntil(this.destroy$))
      .subscribe({
        next: (response: any) => {
          this.uploading[documentType] = false;
          this.uploadResponses[documentType] = response;
          this.alertService.alert({
            type: 'success',
            message: response?.message || 'Document uploaded successfully.'
          });
        },
        error: (err: any) => {
          this.uploading[documentType] = false;
          this.uploadErrors[documentType] =
            err?.error?.developerMessage ||
            err?.error?.defaultUserMessage ||
            err?.message ||
            'Failed to upload document.';
        }
      });
  }

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