/**
 * 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, Input, Output, EventEmitter, inject, ChangeDetectorRef } from '@angular/core';
import { UntypedFormGroup, UntypedFormBuilder, Validators, ReactiveFormsModule, FormsModule } from '@angular/forms';
import { Dates } from 'app/core/utils/dates';

/** Custom Services */
import { CurrentAccountsService } from 'app/current-accounts/current-accounts.service';
import { SettingsService } from 'app/settings/settings.service';
import { ClientsService } from 'app/clients/clients.service';
import { MatDialog } from '@angular/material/dialog';
import { MatStepperPrevious, MatStepperNext } from '@angular/material/stepper';
import { MatIcon } from '@angular/material/icon';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
import { IntroducerSearchComponent } from 'app/shared/introducer-search/introducer-search.component';
import { AddRelatedClientDialogComponent } from './add-related-client-dialog/add-related-client-dialog.component';

/**
 * Current Account Details Step
 */
@Component({
  selector: 'mifosx-current-account-details-step',
  templateUrl: './current-account-details-step.component.html',
  styleUrls: ['./current-account-details-step.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    MatStepperPrevious,
    FaIconComponent,
    MatStepperNext,
    IntroducerSearchComponent,
    MatIcon,
    FormsModule
  ]
})
export class CurrentAccountDetailsStepComponent implements OnInit {
  private formBuilder = inject(UntypedFormBuilder);
  private currentAccountsService = inject(CurrentAccountsService);
  private settingsService = inject(SettingsService);
  private clientsService = inject(ClientsService);
  private dialog = inject(MatDialog);
  private dateUtils = inject(Dates);
  private cdr = inject(ChangeDetectorRef);

  @Input() currentAccountTemplate: any;

  minDate = new Date(2000, 0, 1);
  maxDate = new Date();
  productData: any;
  fieldOfficerData: any;
  isFieldOfficerPatched = false;
  currentAccountDetailsForm: UntypedFormGroup;

  currentAccountProductSelected = false;
  introducerId: number | null = null;
  introducerName: string | null = null;
  introducerCif: string | null = null;

  // ── Non-Individual (existing) ──────────────────────────────────────────
  isNonIndividualClient = false;
  relatedClients: Array<{
    clientId: number;
    clientName: string;
    clientCif: string;
    sharePercentage: number;
    isMandatory: boolean;
  }> = [];
  signatoryRights = '';

  readonly signatoryRightsOptions = [
    { value: 'ANYONE', label: 'E or S', sublabel: 'Either or Survivor', icon: 'how_to_vote' },
    { value: 'ONE_MANDATORY', label: 'J/One', sublabel: 'Joint – One Mandatory', icon: 'group' },
    { value: 'TWO_MANDATORY', label: 'J/Two', sublabel: 'Joint – Two Mandatory', icon: 'groups' },
    { value: 'ONLY_ONE', label: 'Single', sublabel: 'Only 1 Person', icon: 'person' }
  ];

  @Output() currentAccountProductTemplate = new EventEmitter();

  productTemplate: any = null;
  accountTypeOptions: string[] = [];
  customerSegmentOptions: string[] = [];
  selectedAccountType: string | null = null;
  selectedCustomerSegment: string | null = null;

  // ── Client info (auto-fetched) ─────────────────────────────────────────
  clientDob: Date | null = null;
  clientAge: number | null = null;
  clientGender: string | null = null;
  primaryClientName = '';
  primaryClientCif = '';
  primaryClientId: number | null = null;
  primaryHolderShare = 0;

  // ── Status of Account (RBI) ────────────────────────────────────────────
  readonly accountStatusOptions = [
    { value: 'INDIVIDUAL_MALE', label: 'Individual (Male)', icon: 'person', color: '#3b82f6' },
    { value: 'INDIVIDUAL_FEMALE', label: 'Individual (Female)', icon: 'person_outline', color: '#ec4899' },
    { value: 'SINGLE', label: 'Single Account', icon: 'account_circle', color: '#0891b2' },
    { value: 'JOINT', label: 'Joint Account', icon: 'group', color: '#8b5cf6' },
    { value: 'MINOR', label: 'Minor Account', icon: 'child_care', color: '#f59e0b' },
    { value: 'SENIOR_CITIZEN', label: 'Senior Citizen', icon: 'elderly', color: '#10b981' }
  ];

  selectedAccountStatus = '';

  // ── Joint Account (Status of Account) ─────────────────────────────────
  jointHolders: Array<{
    clientId: number;
    clientName: string;
    clientCif: string;
    sharePercentage: number;
    isMandatory: boolean;
  }> = [];

  modeOfOperation = '';

  readonly modeOfOperationOptions = [
    { value: 'EITHER_OR_SURVIVOR', label: 'E or S', sublabel: 'Either or Survivor', icon: 'how_to_vote' },
    { value: 'FORMER_OR_SURVIVOR', label: 'F or S', sublabel: 'Former or Survivor', icon: 'person' },
    { value: 'JOINTLY', label: 'Jointly', sublabel: 'All Must Sign', icon: 'groups' },
    { value: 'ANYONE_OR_SURVIVOR', label: 'Anyone', sublabel: 'Anyone or Survivor', icon: 'group' }
  ];

  // ── Individual Male — Special Category ────────────────────────────────
  selectedSpecialCategory = '';

  readonly specialCategoryOptions = [
    { value: 'DEFENCE', label: 'Defence Personnel', icon: 'military_tech' },
    { value: 'EX_SERVICEMAN', label: 'Ex-Serviceman', icon: 'shield' },
    { value: 'GOVT_EMPLOYEE', label: 'Government Employee', icon: 'account_balance' },
    { value: 'PHYSICALLY_CHALLENGED', label: 'Physically Challenged', icon: 'accessible' },
    { value: 'NRI', label: 'NRI (Non-Resident Indian)', icon: 'flight' },
    { value: 'NONE', label: 'None / General', icon: 'person' }
  ];

  // ── Individual Female — Weaker Section ────────────────────────────────
  selectedWeakerSection = '';

  readonly weakerSectionOptions = [
    { value: 'BPL', label: 'BPL (Below Poverty Line)', icon: 'volunteer_activism' },
    { value: 'SC_ST', label: 'SC / ST Category', icon: 'groups' },
    { value: 'MINORITY', label: 'Minority Community', icon: 'diversity_3' },
    { value: 'SHG', label: 'Self Help Group Member', icon: 'handshake' },
    { value: 'PMJDY', label: 'PMJDY Beneficiary', icon: 'savings' },
    { value: 'NONE', label: 'None / General', icon: 'person_outline' }
  ];

  // ── Minor Account ──────────────────────────────────────────────────────
  guardianClientId: number | null = null;
  guardianName = '';
  guardianCif = '';
  guardianRelationship = '';
  minorDob: Date | null = null;

  readonly guardianRelationshipOptions = ['Father', 'Mother', 'Legal Guardian', 'Court Appointed Guardian'];

  constructor() {
    this.createCurrentAccountDetailsForm();
  }

  ngOnInit() {
    this.maxDate = this.settingsService.businessDate;
    this.buildDependencies();

    const clientId = this.currentAccountTemplate?.clientId;
    if (clientId) {
      this.primaryClientId = clientId;
      this.clientsService.getClientData(String(clientId)).subscribe((client: any) => {
        this.isNonIndividualClient = client?.legalForm?.id === 2;
        this.primaryClientName = client?.displayName ?? client?.fullname ?? '';
        this.primaryClientCif = client?.cifNumber ?? client?.cifNo ?? '';
        if (client?.dateOfBirth) {
          const dob = this.parseClientDob(client.dateOfBirth);
          if (dob) {
            this.clientDob = dob;
            this.clientAge = this.calculateAge(dob);
            this.clientGender = client.gender?.name?.toLowerCase() ?? null;
            this.autoDetectAccountStatus();
          }
        }
        this.cdr.detectChanges();
      });
    }

    if (this.currentAccountTemplate) {
      this.productData = this.currentAccountTemplate.productOptions;
      if (this.currentAccountTemplate.currentAccountProductId) {
        this.currentAccountDetailsForm.patchValue({
          productId: this.currentAccountTemplate.currentAccountProductId,
          submittedOnDate:
            this.currentAccountTemplate.timeline.submittedOnDate &&
            new Date(this.currentAccountTemplate.timeline.submittedOnDate),
          externalId: this.currentAccountTemplate.externalId
        });
      } else {
        this.currentAccountDetailsForm.patchValue({
          submittedOnDate: this.settingsService.businessDate
        });
      }
    }
  }

  createCurrentAccountDetailsForm() {
    this.currentAccountDetailsForm = this.formBuilder.group({
      productId: ['', Validators.required],
      submittedOnDate: ['', Validators.required],
      fieldOfficerId: [''],
      externalId: [''],
      balanceSwapOption: [false],
      msme: [false],
      autoDebitFacility: [false],
      establishmentDate: [''],
      startOperationDate: ['']
    });
  }

  buildDependencies() {
    const entityId = this.currentAccountTemplate.groupId || this.currentAccountTemplate.clientId;
    this.currentAccountDetailsForm.get('productId').valueChanges.subscribe((productId: string) => {
      this.currentAccountsService
        .getCurrentAccountTemplate(entityId, productId, this.currentAccountTemplate.groupId ? true : false)
        .subscribe((response: any) => {
          if (!response.currency) {
            const selectedProduct = this.currentAccountTemplate.productOptions?.find(
              (product: any) => product.id == productId
            );
            if (selectedProduct?.currency) {
              response.currency = selectedProduct.currency;
            } else if (this.currentAccountTemplate.currency) {
              response.currency = this.currentAccountTemplate.currency;
            }
          }
          this.productTemplate = response;
          this.accountTypeOptions = this.extractOptions(response.accountTypeOptions, response.accountType);
          this.customerSegmentOptions = this.extractOptions(response.customerSegmentOptions, response.customerSegment);
          this.selectedAccountType = response.accountType ?? null;
          this.selectedCustomerSegment = response.customerSegment ?? null;
          this.currentAccountProductTemplate.emit(response);
          this.fieldOfficerData = response.fieldOfficerOptions;
          this.currentAccountProductSelected = true;
          this.currentAccountDetailsForm.patchValue({
            balanceSwapOption: !!response.balanceSwapOption,
            msme: !!response.msme,
            autoDebitFacility: !!response.autoDebitFacility
          });
          this.cdr.detectChanges();
          if (!this.isFieldOfficerPatched && this.currentAccountTemplate.fieldOfficerId) {
            this.currentAccountDetailsForm.get('fieldOfficerId').patchValue(this.currentAccountTemplate.fieldOfficerId);
            this.isFieldOfficerPatched = true;
          } else {
            this.currentAccountDetailsForm.get('fieldOfficerId').patchValue('');
          }
        });
    });
  }

  private extractOptions(options: any[], fallback?: string): string[] {
    if (Array.isArray(options) && options.length > 0) {
      return options.map((o: any) => o.value ?? o.name ?? o);
    }
    return fallback ? [fallback] : [];
  }

  formatTemplateDate(value: any): string {
    if (!value) return '';
    let dateValue: Date | null = null;
    if (value instanceof Date) {
      dateValue = value;
    } else if (Array.isArray(value) && value.length >= 3) {
      dateValue = new Date(value[0], value[1] - 1, value[2]);
    } else {
      dateValue = new Date(value);
    }
    if (!dateValue || Number.isNaN(dateValue.getTime())) {
      return Array.isArray(value) ? value.join('/') : String(value);
    }
    return this.dateUtils.formatDate(dateValue, 'M/d/yyyy') || '';
  }

  // ── Client DOB helpers ─────────────────────────────────────────────────
  private parseClientDob(dob: any): Date | null {
    if (!dob) return null;
    if (Array.isArray(dob) && dob.length >= 3) return new Date(dob[0], dob[1] - 1, dob[2]);
    const d = new Date(dob);
    return isNaN(d.getTime()) ? null : d;
  }

  private calculateAge(dob: Date): number {
    const today = this.settingsService.businessDate ?? new Date();
    let age = today.getFullYear() - dob.getFullYear();
    const m = today.getMonth() - dob.getMonth();
    if (m < 0 || (m === 0 && today.getDate() < dob.getDate())) age--;
    return age;
  }

  private autoDetectAccountStatus(): void {
    if (this.clientAge === null) return;
    if (this.clientAge < 18) {
      this.selectedAccountStatus = 'MINOR';
      this.minorDob = this.clientDob;
    } else if (this.clientAge >= 60) {
      this.selectedAccountStatus = 'SENIOR_CITIZEN';
    } else if (this.clientGender === 'female') {
      this.selectedAccountStatus = 'INDIVIDUAL_FEMALE';
    } else {
      this.selectedAccountStatus = 'INDIVIDUAL_MALE';
    }
  }

  isTileDisabled(value: string): boolean {
    if (value === 'MINOR') return this.clientAge === null || this.clientAge >= 18;
    if (value === 'SENIOR_CITIZEN') return this.clientAge === null || this.clientAge < 60;
    return false;
  }

  getTileTooltip(value: string): string {
    if (value === 'MINOR' && this.clientAge !== null && this.clientAge >= 18)
      return `Age ${this.clientAge} yrs — Minor only allowed below 18 years`;
    if (value === 'SENIOR_CITIZEN' && this.clientAge !== null && this.clientAge < 60)
      return `Age ${this.clientAge} yrs — Senior Citizen only allowed at 60+ years`;
    if (value === 'MINOR' && this.clientAge === null) return 'DOB not available — cannot verify age';
    if (value === 'SENIOR_CITIZEN' && this.clientAge === null) return 'DOB not available — cannot verify age';
    return '';
  }

  // ── Introducer ─────────────────────────────────────────────────────────
  onIntroducerChange(event: { clientId: number; displayName: string; cifNumber?: string } | null): void {
    this.introducerId = event?.clientId ?? null;
    this.introducerName = event?.displayName ?? null;
    this.introducerCif = event?.cifNumber ?? null;
  }

  onGuardianChange(event: { clientId: number; displayName: string; cifNumber?: string } | null): void {
    this.guardianClientId = event?.clientId ?? null;
    this.guardianName = event?.displayName ?? '';
    this.guardianCif = event?.cifNumber ?? '';
  }

  // ── Joint Account (Status of Account) ─────────────────────────────────
  openAddJointHolderDialog(): void {
    const ref = this.dialog.open(AddRelatedClientDialogComponent, {
      width: '500px',
      panelClass: 'arc-dialog-panel',
      disableClose: true
    });
    ref.afterClosed().subscribe((result) => {
      if (result) {
        const duplicate = this.jointHolders.some((h) => h.clientCif && h.clientCif === result.clientCif);
        if (duplicate) {
          alert(`Account holder with CIF ${result.clientCif} is already added.`);
          return;
        }
        this.jointHolders = [...this.jointHolders, { ...result, isMandatory: false }];
        this.autoSetModeOfOperation();
      }
    });
  }

  removeJointHolder(index: number): void {
    this.jointHolders = this.jointHolders.filter((_, i) => i !== index);
    this.autoSetModeOfOperation();
  }

  toggleJointHolderMandatory(holder: any): void {
    holder.isMandatory = !holder.isMandatory;
    this.autoSetModeOfOperation();
  }

  autoSetModeOfOperation(): void {
    const mandatory = this.jointHolders.filter((h) => h.isMandatory).length;
    if (mandatory === 0) this.modeOfOperation = 'EITHER_OR_SURVIVOR';
    else if (mandatory === 1) this.modeOfOperation = 'FORMER_OR_SURVIVOR';
    else this.modeOfOperation = 'JOINTLY';
  }

  get totalJointSharePercentage(): number {
    return (this.primaryHolderShare || 0) + this.jointHolders.reduce((sum, h) => sum + (h.sharePercentage || 0), 0);
  }

  get mandatoryJointCount(): number {
    return this.jointHolders.filter((h) => h.isMandatory).length;
  }

  get selectedModeLabel(): string {
    return this.modeOfOperationOptions.find((o) => o.value === this.modeOfOperation)?.sublabel ?? '';
  }

  get majorityDate(): string {
    const dob = this.minorDob ?? this.clientDob;
    if (!dob) return '';
    const d = new Date(dob);
    d.setFullYear(d.getFullYear() + 18);
    return this.dateUtils.formatDate(d, 'M/d/yyyy') || '';
  }

  // ── Non-Individual (existing) helpers ──────────────────────────────────
  openAddRelatedClientDialog(): void {
    const ref = this.dialog.open(AddRelatedClientDialogComponent, {
      width: '500px',
      panelClass: 'arc-dialog-panel',
      disableClose: true
    });
    ref.afterClosed().subscribe((result) => {
      if (result) {
        const duplicate = this.relatedClients.some((c) => c.clientCif && c.clientCif === result.clientCif);
        if (duplicate) {
          alert(`Partner with CIF ${result.clientCif} is already added.`);
          return;
        }
        this.relatedClients = [...this.relatedClients, { ...result, isMandatory: false }];
        this.autoSetSignatoryRights();
      }
    });
  }

  removeRelatedClient(index: number): void {
    this.relatedClients = this.relatedClients.filter((_, i) => i !== index);
    this.autoSetSignatoryRights();
  }

  toggleMandatory(client: any): void {
    client.isMandatory = !client.isMandatory;
    this.autoSetSignatoryRights();
  }

  autoSetSignatoryRights(): void {
    const mandatory = this.relatedClients.filter((c) => c.isMandatory).length;
    if (mandatory === 0) this.signatoryRights = 'ANYONE';
    else if (mandatory === 1) this.signatoryRights = 'ONE_MANDATORY';
    else this.signatoryRights = 'TWO_MANDATORY';
  }

  get totalSharePercentage(): number {
    return this.relatedClients.reduce((sum, c) => sum + (c.sharePercentage || 0), 0);
  }

  get mandatoryCount(): number {
    return this.relatedClients.filter((c) => c.isMandatory).length;
  }

  get selectedSignatoryLabel(): string {
    const opt = this.signatoryRightsOptions.find((x) => x.value === this.signatoryRights);
    return opt ? opt.sublabel : '';
  }

  get currentAccountDetails() {
    const value = this.currentAccountDetailsForm.getRawValue();
    if (this.introducerId) {
      value.introducerId = this.introducerId;
      value.introducerName = this.introducerName;
      value.introducerCif = this.introducerCif;
    }
    if (this.isNonIndividualClient) {
      value.signatoryRights = this.signatoryRights || null;
      value.partners = this.relatedClients.map((c) => ({
        clientId: c.clientId,
        clientName: c.clientName,
        clientCif: c.clientCif,
        sharePercentage: c.sharePercentage,
        isMandatory: c.isMandatory
      }));
    } else {
      if (this.selectedAccountStatus) value.accountStatus = this.selectedAccountStatus;
      if (this.selectedAccountStatus === 'INDIVIDUAL_MALE' && this.selectedSpecialCategory)
        value.specialCategory = this.selectedSpecialCategory;
      if (this.selectedAccountStatus === 'INDIVIDUAL_FEMALE' && this.selectedWeakerSection)
        value.weakerSection = this.selectedWeakerSection;
      if (this.selectedAccountStatus === 'JOINT') {
        value.modeOfOperation = this.modeOfOperation || null;
        value.jointHolders = [
          {
            clientId: this.primaryClientId,
            clientName: this.primaryClientName,
            clientCif: this.primaryClientCif,
            sharePercentage: this.primaryHolderShare,
            isMandatory: true,
            isPrimary: true
          },
          ...this.jointHolders.map((h) => ({ ...h, isPrimary: false }))
        ];
      }
      if (this.selectedAccountStatus === 'MINOR') {
        value.guardianClientId = this.guardianClientId;
        value.guardianName = this.guardianName;
        value.guardianCif = this.guardianCif;
        value.guardianRelationship = this.guardianRelationship;
        value.minorDob = this.minorDob ? this.dateUtils.formatDate(this.minorDob, 'yyyy-MM-dd') : null;
      }
    }
    return value;
  }
}