import { Component, EventEmitter, inject, Input, OnInit, Output, ViewChild } from '@angular/core';
import { FormBuilder, FormGroup, ReactiveFormsModule, Validators } from '@angular/forms';
import { MatPaginator, MatPaginatorIntl } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTableDataSource } from '@angular/material/table';
import { AngularMaterialModule } from '../../shared/module/angular-material.module';
import { CommonModule } from '@angular/common';
import { CustomPaginator } from '../../shared/custom-paginator';
import { UserPreferences } from '../../core/models/user-preference';
import { ApiErrorHandlerService } from '../../core/services/common/api-error-handler.service';
import { NotificationService } from '../../core/services/common/notification.service';
import { finalize } from 'rxjs';
import { CargoRate } from '../../core/models/service-provider/cargo-rate';
import { CargoRateService } from '../../core/services/service-provider/cargo-rate.service';

@Component({
  selector: 'app-cargo-rate',
  imports: [AngularMaterialModule, CommonModule, ReactiveFormsModule],
  templateUrl: './cargo-rate.component.html',
  styleUrl: './cargo-rate.component.scss',
  providers: [{ provide: MatPaginatorIntl, useClass: CustomPaginator }],
})
export class CargoRateComponent implements OnInit {
  @ViewChild(MatPaginator, { static: false })
  set paginator(value: MatPaginator) {
    this.dataSource.paginator = value;
  }

  @ViewChild(MatSort, { static: false })
  set sort(value: MatSort) {
    this.dataSource.sort = value;
  }

  displayedColumns: string[] = ['carnetType', 'startSets', 'endSets', 'rate', 'effectiveDate', 'actions'];
  dataSource = new MatTableDataSource<any>();
  cargoRateForm: FormGroup;
  isEditing = false;
  currentCargoRateId: number | null = null;
  isLoading = false;
  changeInProgress = false;
  showForm = false;
  showExpiredRecords = false;
  cargoRates: CargoRate[] = [];

  readOnlyFields: any = {
    lastChangedDate: null,
    lastChangedBy: null
  };

  carnetTypes = [
    { label: 'Original', value: 'ORIGINAL' },
    { label: 'Re-order', value: 'REORDER' },
    { label: 'Replacement', value: 'REPLACE' }
  ];

  @Input() isEditMode = false;
  @Input() spid: number = 0;
  @Input() userPreferences!: UserPreferences;
  @Output() hasCargoRates = new EventEmitter<boolean>();

  private fb = inject(FormBuilder);
  private cargoRateService = inject(CargoRateService);
  private notificationService = inject(NotificationService);
  private errorHandler = inject(ApiErrorHandlerService);

  constructor() {
    this.cargoRateForm = this.fb.group({
      carnetType: ['ORIGINAL', Validators.required],
      startSets: ['', [
        Validators.required,
        Validators.pattern('^[0-9]*$'),
        Validators.min(1)
      ]],
      endSets: ['', [
        Validators.required,
        Validators.pattern('^[0-9]*$'),
        Validators.min(1)
      ]],
      rate: ['', [
        Validators.required,
        Validators.pattern(/^\d+\.?\d{0,2}$/),
        Validators.min(0)
      ]],
      effectiveDate: ['', Validators.required]
    }, { validator: this.validateSetsRange });
  }

  ngOnInit(): void {
    this.loadCargoRates();
  }

  ngAfterViewInit() {
    this.dataSource.paginator = this.paginator;
    this.dataSource.sort = this.sort;
  }

  private validateSetsRange(group: FormGroup): { [key: string]: any } | null {
    const start = +group.get('startSets')?.value;
    const end = +group.get('endSets')?.value;
    return start && end && start >= end ? { invalidRange: true } : null;
  }

  loadCargoRates(): void {
    if (!this.spid) return;

    this.isLoading = true;
    this.cargoRateService.getCargoRates(this.spid).pipe(finalize(() => {
      this.isLoading = false;
    }))
      .subscribe({
        next: (
          cargoRates: CargoRate[]) => {
          this.cargoRates = cargoRates;
          this.dataSource.data = this.cargoRates;
          this.renderRecods();
        },
        error: (error: any) => {
          let errorMessage = this.errorHandler.handleApiError(error, 'Failed to load cargo rates');
          this.notificationService.showError(errorMessage);
          console.error('Error loading cargo rates:', error);
        }
      });
  }

  toggleShowExpiredRecords(): void {
    this.showExpiredRecords = !this.showExpiredRecords;
    this.renderRecods();
  }

  renderRecods(): void {
    if (this.showExpiredRecords) {
      this.dataSource.data = this.cargoRates.filter(record => record.expired);
    } else {
      this.dataSource.data = this.cargoRates.filter(record => !record.expired);
    }
  }

  // applyFilter(event: Event): void {
  //   const filterValue = (event.target as HTMLInputElement).value;
  //   this.dataSource.filter = filterValue.trim().toLowerCase();

  //   if (this.dataSource.paginator) {
  //     this.dataSource.paginator.firstPage();
  //   }
  // }

  addNewCargoRate(): void {
    this.showForm = true;
    this.isEditing = false;
    this.currentCargoRateId = null;
    this.cargoRateForm.reset({
      carnetType: 'ORIGINAL'
    });

    this.cargoRateForm.get('carnetType')?.enable();
    this.cargoRateForm.get('startSets')?.enable();
    this.cargoRateForm.get('endSets')?.enable();
  }

  editCargoRate(cargoRate: any): void {
    this.showForm = true;
    this.isEditing = true;
    this.currentCargoRateId = cargoRate.id;
    this.cargoRateForm.patchValue({
      carnetType: cargoRate.carnetType,
      startSets: cargoRate.startSets,
      endSets: cargoRate.endSets,
      rate: cargoRate.rate,
      effectiveDate: new Date(cargoRate.effectiveDate)
    });

    this.readOnlyFields.lastChangedDate = cargoRate.dateCreated;
    this.readOnlyFields.lastChangedBy = cargoRate.createdBy;

    this.cargoRateForm.get('carnetType')?.disable();
    this.cargoRateForm.get('startSets')?.disable();
    this.cargoRateForm.get('endSets')?.disable();
  }

  saveCargoRate(): void {
    if (this.cargoRateForm.invalid) {
      this.cargoRateForm.markAllAsTouched();
      return;
    }

    const cargoRateData = {
      ...this.cargoRateForm.value,
      spid: this.spid
    };

    const saveObservable = this.isEditing && this.currentCargoRateId
      ? this.cargoRateService.updateCargoRate(this.currentCargoRateId, cargoRateData)
      : this.cargoRateService.addCargoRate(this.spid, cargoRateData);

    this.changeInProgress = true;
    saveObservable.pipe(finalize(() => {
      this.changeInProgress = false;
    })).subscribe({
      next: () => {
        this.notificationService.showSuccess(`Cargo Rate ${this.isEditing ? 'updated' : 'added'} successfully`);
        this.loadCargoRates();
        this.cancelEdit();
        this.hasCargoRates.emit(true);
      },
      error: (error) => {
        let errorMessage = this.errorHandler.handleApiError(error, `Failed to ${this.isEditing ? 'update' : 'add'} cargo rate`);
        this.notificationService.showError(errorMessage);
        console.error('Error saving cargo rate:', error);
      }
    });
  }

  // deleteCargoRate(cargoRateId: string): void {
  //   const dialogRef = this.dialog.open(ConfirmDialogComponent, {
  //     width: '350px',
  //     data: {
  //       title: 'Confirm Delete',
  //       message: 'Are you sure you want to delete this cargoRate setup?',
  //       confirmText: 'Delete',
  //       cancelText: 'Cancel'
  //     }
  //   });

  //   dialogRef.afterClosed().subscribe(result => {
  //     if (result) {
  //       this.cargoRateService.deleteCargoRate(cargoRateId).subscribe({
  //         next: () => {
  //           this.notificationService.showSuccess('CargoRate deleted successfully');
  //           this.loadCargoRates();
  //         },
  //         error: (error) => {
  //           this.notificationService.showError('Failed to delete cargoRate');
  //         }
  //       });
  //     }
  //   });
  // }

  cancelEdit(): void {
    this.showForm = false;
    this.isEditing = false;
    this.currentCargoRateId = null;
    this.cargoRateForm.reset({
      carnetType: 'ORIGINAL'
    });
  }

  getOptionLabel(options: any[], value: string): string {
    return options.find(opt => opt.value === value)?.label || value;
  }
}