import { Component, EventEmitter, inject, Input, Output } from '@angular/core';
import { FormGroup, FormBuilder, Validators, ReactiveFormsModule } from '@angular/forms';
import { finalize, Subject, takeUntil } from 'rxjs';
import { Country } from '../../core/models/country';
import { CommonService } from '../../core/services/common/common.service';
import { Replacement } from '../../core/models/carnet/replacement';
import { ReplacementService } from '../../core/services/carnet/replacement.service';
import { ApiErrorHandlerService } from '../../core/services/common/api-error-handler.service';
import { NotificationService } from '../../core/services/common/notification.service';
import { CommonModule } from '@angular/common';
import { AngularMaterialModule } from '../../shared/module/angular-material.module';
import { ExtensionReason } from '../../core/models/extension-reason';

@Component({
  selector: 'app-replacement-set',
  imports: [AngularMaterialModule, CommonModule, ReactiveFormsModule],
  templateUrl: './replacement-set.component.html',
  styleUrl: './replacement-set.component.scss'
})
export class ReplacementSetComponent {
  @Input() headerid: number = 0;
  @Input() isViewMode = false;
  @Input() isEditMode: boolean = false;
  @Output() completed = new EventEmitter<boolean>();

  extensionForm: FormGroup;
  countries: Country[] = [];
  extensionReasons: ExtensionReason[] = [];
  replacementDetails: Replacement | undefined;

  // UI state
  isEditing = false;
  isLoading = false;
  changeInProgress = false;

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

  private fb = inject(FormBuilder);
  private commonService = inject(CommonService);
  private notificationService = inject(NotificationService);
  private replacementService = inject(ReplacementService);
  private errorHandler = inject(ApiErrorHandlerService);

  constructor(
  ) {
    this.extensionForm = this.createForm();
  }

  ngOnInit(): void {
    this.loadCountries();
    this.loadExtensionReasons();

    if (this.headerid > 0) {
      this.isLoading = true;
      this.replacementService.getExtensionData(this.headerid).pipe(finalize(() => {
        this.isLoading = false;
      })).subscribe({
        next: (replacementData: Replacement) => {
          if (replacementData) {
            this.patchFormData(replacementData);
            this.replacementDetails = replacementData;
            this.completed.emit(this.extensionForm.valid || this.extensionForm.disabled);
          }
        },
        error: (error: any) => {
          let errorMessage = this.errorHandler.handleApiError(error, 'Failed to load extension details');
          this.notificationService.showError(errorMessage);
          console.error('Error loading extension details:', error);
        }
      });
    }
  }

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

  patchFormData(data: Replacement): void {
    this.extensionForm.patchValue({
      portName: data.portName,
      portCountry: data.portCountry,
      reasonForExtension: data.reasonForExtension,
      duration: data.duration
    });

    if (this.isViewMode) {
      this.extensionForm.disable();
    }
  }

  createForm(): FormGroup {
    return this.fb.group({
      portName: [''],
      portCountry: [''],
      reasonForExtension: ['', Validators.required],
      duration: ['', [Validators.max(12)]]
    });
  }

  loadCountries(): void {
    this.commonService.getCountries()
      .pipe(takeUntil(this.destroy$))
      .subscribe({
        next: (countries) => {
          this.countries = countries;
        },
        error: (error) => {
          console.error('Failed to load countries', error);
        }
      });
  }

  loadExtensionReasons(): void {
    this.commonService.getExtensionReasons()
      .pipe(takeUntil(this.destroy$))
      .subscribe({
        next: (extensionReasons) => {
          this.extensionReasons = extensionReasons;
        },
        error: (error) => {
          console.error('Failed to load extension reasons', error);
        }
      });
  }

  onSubmit(): void {
    if (this.extensionForm.invalid) {
      this.extensionForm.markAllAsTouched();
      return;
    }

    const formData = this.extensionForm.value;
    this.changeInProgress = true;

    this.replacementService.saveExtensionDetails(this.headerid, formData).pipe(finalize(() => {
      this.changeInProgress = false;
    })).subscribe({
      next: () => {
        this.notificationService.showSuccess('Extension details saved successfully');
        this.completed.emit(this.extensionForm.valid);
      },
      error: (error) => {
        let errorMessage = this.errorHandler.handleApiError(error, 'Failed to save extension information');
        this.notificationService.showError(errorMessage);
        console.error('Error saving extension information:', error);
      }
    });
  }

  get f() {
    return this.extensionForm.controls;
  }

  getAddressLabel(): string {
    if (!this.replacementDetails) {
      return 'No contact information available';
    }

    // Build name parts, filtering out null/undefined/empty strings
    const allParts = [
      this.replacementDetails.address1,
      this.replacementDetails.address2,
      this.replacementDetails.city,
      this.replacementDetails.state,
      this.replacementDetails.country,
      this.replacementDetails.zip
    ].filter(part => part != null && part.trim() !== '');

    return allParts.join(', ') || '';
  }
}