import { Component, computed, inject, linkedSignal, input, afterNextRender } from '@angular/core';
import { form, FormField, required } from '@angular/forms/signals';
import { MatButtonModule } from '@angular/material/button';
import { MatCheckboxModule } from '@angular/material/checkbox';
import { MatOptionModule } from '@angular/material/core';
import { MatDialog } from '@angular/material/dialog';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatSelectModule } from '@angular/material/select';
import { MatSnackBar } from '@angular/material/snack-bar';
import { Router } from '@angular/router';

import { Modifier } from '../../core/modifier';
import { ModifierCategory } from '../../core/modifier-category';
import { ModifierCategoryService } from '../../modifier-categories/modifier-category.service';
import { ConfirmDialogComponent } from '../../shared/confirm-dialog/confirm-dialog.component';
import { ErrorStateComponent } from '../../shared/error-state/error-state.component';
import { SkeletonLoaderComponent } from '../../shared/skeleton-loader/skeleton-loader.component';
import { ModifierService } from '../modifier.service';

export interface ModifierDetailFormData {
  name: string;
  showInBill: boolean;
  price: number;
  modifierCategory: string;
  isActive: boolean;
}

@Component({
  selector: 'app-modifier-detail',
  templateUrl: './modifier-detail.component.html',
  styleUrls: ['./modifier-detail.component.css'],
  imports: [
    MatButtonModule,
    MatCheckboxModule,
    MatFormFieldModule,
    MatInputModule,
    MatOptionModule,
    MatSelectModule,
    FormField,
    ErrorStateComponent,
    SkeletonLoaderComponent,
  ],
})
export class ModifierDetailComponent {
  private modifierCategoryService = inject(ModifierCategoryService);
  private router = inject(Router);
  private dialog = inject(MatDialog);
  private snackBar = inject(MatSnackBar);
  private ser = inject(ModifierService);
  id = input(null, { transform: (v: string | null | undefined) => v ?? null });

  modifierCategoriesResource = this.modifierCategoryService.list();
  modifierCategories = computed(() => this.modifierCategoriesResource.value() ?? []);

  itemResource = this.ser.get(this.id);

  item = computed(() => this.itemResource.value() ?? new Modifier());
  formModel = linkedSignal({
    source: this.item,
    computation: (itemVal): ModifierDetailFormData => {
      return {
        name: itemVal.name ?? '',
        showInBill: itemVal.showInBill,
        price: itemVal.price ?? 0,
        isActive: itemVal.isActive,
        modifierCategory: itemVal.modifierCategory ? (itemVal.modifierCategory.id as string) : '',
      };
    },
  });

  form = form(this.formModel, (schema) => {
    required(schema.modifierCategory, { message: 'Modifier Category is required' });
  });

  constructor() {
    afterNextRender(() => {
      this.form().focusBoundControl();
    });
  }

  save() {
    this.ser.saveOrUpdate(this.getItem()).subscribe({
      next: () => {
        this.snackBar.open('', 'Success');
        this.router.navigateByUrl('/modifiers');
      },
      error: (error: unknown) => {
        this.snackBar.open(error as string, 'Error');
      },
    });
  }

  delete() {
    this.ser.delete(this.item().id as string).subscribe({
      next: () => {
        this.snackBar.open('', 'Success');
        this.router.navigateByUrl('/modifiers');
      },
      error: (error: unknown) => {
        this.snackBar.open(error as string, 'Error');
      },
    });
  }

  confirmDelete(): void {
    const dialogRef = this.dialog.open(ConfirmDialogComponent, {
      width: '250px',
      data: { title: 'Delete Modifier?', content: 'Are you sure? This cannot be undone.' },
    });

    dialogRef.afterClosed().subscribe((result: boolean) => {
      if (result) {
        this.delete();
      }
    });
  }

  getItem(): Modifier {
    const formModel = this.formModel();
    return new Modifier({
      ...this.item(),
      name: formModel.name ?? '',
      showInBill: formModel.showInBill ?? false,
      price: formModel.price ?? 0,
      isActive: formModel.isActive ?? true,
      modifierCategory: new ModifierCategory({ id: formModel.modifierCategory }),
    });
  }
}