/**
 * 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, Output, EventEmitter, inject, OnInit } from '@angular/core';
import { UntypedFormBuilder, UntypedFormGroup, Validators, FormsModule } from '@angular/forms';
import { DomSanitizer } from '@angular/platform-browser';
import { ClientsService } from 'app/clients/clients.service';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
import { MatProgressSpinner } from '@angular/material/progress-spinner';
import { MatIconButton } from '@angular/material/button';
import { MatIcon } from '@angular/material/icon';
import { MatCheckbox } from '@angular/material/checkbox';
import { MatDatepickerModule } from '@angular/material/datepicker';

export interface NomineeData {
  mode: 'manual' | 'linked';
  // Manual fields
  fullName?: string;
  relationship?: string;
  dateOfBirth?: string;
  nationality?: string;
  aadhaarNumber?: string;
  panNumber?: string;
  mobileNo?: string;
  nomineeShare?: number;
  isAlive?: boolean;
  isDependent?: boolean;
  guardianName?: string;
  guardianRelationship?: string;
  remarks?: string;
  // Linked client fields
  clientId?: number;
  displayName?: string;
  cifNumber?: string;
}

const RELATIONSHIPS = [
  'Spouse',
  'Son',
  'Daughter',
  'Father',
  'Mother',
  'Brother',
  'Sister',
  'Grandfather',
  'Grandmother',
  'Grandson',
  'Granddaughter',
  'Uncle',
  'Aunt',
  'Nephew',
  'Niece',
  'Friend',
  'Other'
];

@Component({
  selector: 'mifosx-nominee-form',
  templateUrl: './nominee-form.component.html',
  styleUrls: ['./nominee-form.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    FormsModule,
    MatProgressSpinner,
    MatIconButton,
    MatIcon,
    MatCheckbox,
    MatDatepickerModule
  ]
})
export class NomineeFormComponent implements OnInit {
  private fb = inject(UntypedFormBuilder);
  private clientsService = inject(ClientsService);
  private sanitizer = inject(DomSanitizer);

  @Output() nomineeChange = new EventEmitter<NomineeData | null>();

  mode: 'manual' | 'linked' = 'manual';
  relationships = RELATIONSHIPS;

  // Manual form
  manualForm!: UntypedFormGroup;
  minDate = new Date(1900, 0, 1);
  maxDate = new Date();

  // Link mode
  searchText = '';
  searching = false;
  searchResults: any[] = [];
  selectedClient: any = null;
  fetchingLinkedData = false;
  linkedProfileImage: any = null;
  linkedKycStatus: any = null;
  clientDob = '';
  clientAadhaar = '';
  clientPan = '';
  clientCifNumber = '';
  linkedRelationship = '';
  linkedShare = 100;

  private searchTimer: any;

  ngOnInit(): void {
    this.manualForm = this.fb.group({
      fullName: [
        '',
        Validators.required
      ],
      relationship: [
        '',
        Validators.required
      ],
      dateOfBirth: [''],
      nationality: ['Indian'],
      aadhaarNumber: [''],
      panNumber: [''],
      mobileNo: [''],
      nomineeShare: [100],
      isAlive: [true],
      isDependent: [false],
      guardianName: [''],
      guardianRelationship: [''],
      remarks: ['']
    });

    this.manualForm.valueChanges.subscribe(() => {
      if (this.mode === 'manual' && this.manualForm.valid) {
        this.emitManual();
      }
    });
  }

  switchMode(m: 'manual' | 'linked'): void {
    this.mode = m;
    if (m === 'manual') {
      this.clearLinked();
    } else {
      this.manualForm.reset({ nationality: 'Indian', isAlive: true, isDependent: false, nomineeShare: 100 });
      this.nomineeChange.emit(null);
    }
  }

  // ─── Manual ──────────────────────────────────────
  private emitManual(): void {
    const v = this.manualForm.value;
    this.nomineeChange.emit({ mode: 'manual', ...v });
  }

  // ─── Link existing client ─────────────────────────
  onSearch(text: string): void {
    this.searchText = text;
    clearTimeout(this.searchTimer);
    if (!text || text.length < 2) {
      this.searchResults = [];
      return;
    }
    this.searching = true;
    this.searchTimer = setTimeout(() => {
      this.clientsService.searchByText(text, 0, 8).subscribe({
        next: (data: any) => {
          this.searchResults = data?.content || [];
          this.searching = false;
        },
        error: () => {
          this.searchResults = [];
          this.searching = false;
        }
      });
    }, 400);
  }

  selectClient(client: any): void {
    this.selectedClient = client;
    this.searchResults = [];
    this.searchText = '';
    this.fetchLinkedClientData(client.id);
    this.nomineeChange.emit({
      mode: 'linked',
      clientId: client.id,
      displayName: client.displayName,
      cifNumber: client.cifNumber || client.cifNo || ''
    });
  }

  removeLinked(): void {
    this.clearLinked();
    this.nomineeChange.emit(null);
  }

  onLinkedRelationshipChange(rel: string): void {
    if (this.selectedClient) {
      this.nomineeChange.emit({
        mode: 'linked',
        clientId: this.selectedClient.id,
        displayName: this.selectedClient.displayName,
        cifNumber: this.selectedClient.accountNo || this.selectedClient.cifNumber || '',
        relationship: rel,
        nomineeShare: this.linkedShare
      });
    }
  }

  private clearLinked(): void {
    this.selectedClient = null;
    this.linkedProfileImage = null;
    this.linkedKycStatus = null;
    this.clientDob = '';
    this.clientAadhaar = '';
    this.clientPan = '';
    this.clientCifNumber = '';
    this.searchText = '';
    this.searchResults = [];
    this.linkedRelationship = '';
    this.linkedShare = 100;
  }

  private fetchLinkedClientData(clientId: string): void {
    this.fetchingLinkedData = true;

    this.clientsService.getClientData(clientId).subscribe({
      next: (data: any) => {
        if (data.dateOfBirth) {
          const d = Array.isArray(data.dateOfBirth)
            ? new Date(data.dateOfBirth[0], data.dateOfBirth[1] - 1, data.dateOfBirth[2])
            : new Date(data.dateOfBirth);
          this.clientDob = d.toLocaleDateString('en-GB', { day: '2-digit', month: 'short', year: 'numeric' });
        }
        this.fetchingLinkedData = false;
      },
      error: () => {
        this.fetchingLinkedData = false;
      }
    });

    this.clientsService.getClientKyc(clientId).subscribe({
      next: (kyc: any) => {
        if (kyc) {
          this.clientAadhaar = kyc.aadhaarNumberMasked || '';
          this.clientPan = kyc.panNumber || '';
          this.linkedKycStatus = {
            panVerified: kyc.panVerified || false,
            aadhaarVerified: kyc.aadhaarVerified || false
          };
        }
      },
      error: () => {}
    });

    this.clientsService.getClientProfileImage(clientId).subscribe({
      next: (imageData: any) => {
        if (imageData) {
          this.linkedProfileImage = this.sanitizer.bypassSecurityTrustResourceUrl(imageData);
        }
      },
      error: () => {}
    });
  }
}