import { CurrencyPipe } from '@angular/common';
import { Component, inject, input, computed, linkedSignal, signal, afterNextRender } from '@angular/core';
import { form as createForm, FormField, FormRoot } from '@angular/forms/signals';
export interface BalanceSheetFormData {
  date: Date;
}
import { MatButtonModule } from '@angular/material/button';
import { MatDatepickerModule } from '@angular/material/datepicker';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatPaginatorModule, PageEvent } from '@angular/material/paginator';
import { MatSortModule, Sort } from '@angular/material/sort';
import { MatTableModule } from '@angular/material/table';
import { Router } from '@angular/router';
import moment from 'moment';

import { ClearPipe } from '../shared/clear.pipe';
import { ErrorStateComponent } from '../shared/error-state/error-state.component';
import { SkeletonLoaderComponent } from '../shared/skeleton-loader/skeleton-loader.component';
import { BalanceSheet } from './balance-sheet';
import { BalanceSheetService } from './balance-sheet.service';

@Component({
  selector: 'app-balance-sheet',
  templateUrl: './balance-sheet.component.html',
  styleUrls: ['./balance-sheet.component.css'],
  host: {
    '(window:keydown.f2)': 'focusDate($event)',
  },
  imports: [
    FormField,
    FormRoot,
    MatFormFieldModule,
    MatInputModule,
    MatDatepickerModule,
    MatButtonModule,
    MatTableModule,
    MatSortModule,
    MatPaginatorModule,
    CurrencyPipe,
    ClearPipe,
    SkeletonLoaderComponent,
    ErrorStateComponent,
  ],
})
export class BalanceSheetComponent {
  private router = inject(Router);
  private ser = inject(BalanceSheetService);
  pageSize = signal(50);
  pageIndex = signal(0);
  date = input(null, { transform: (v: string | null | undefined) => v ?? null });
  infoResource = this.ser.list(this.date);
  info = computed(() => this.infoResource.value() ?? new BalanceSheet());

  sortActive = signal('');
  sortDirection = signal('');

  formModel = linkedSignal<import('./balance-sheet').BalanceSheet, BalanceSheetFormData>({
    source: this.info,
    computation: (info: BalanceSheet): BalanceSheetFormData => ({
      date: info.date ? moment(info.date, 'DD-MMM-YYYY').toDate() : new Date(),
    }),
  });

  form = createForm(this.formModel);
  sortedList = computed(() => {
    const data = this.info().body ?? [];
    const active = this.sortActive();
    const direction = this.sortDirection();

    if (!active || direction === '') {
      return data;
    }

    return [...data].sort((a, b) => {
      const isAsc = direction === 'asc';
      switch (active) {
        case 'group':
          return compare(a.group ?? '', b.group ?? '', isAsc);
        case 'name':
          return compare(a.name ?? '', b.name ?? '', isAsc);
        case 'subAmount':
          return compare(a.subAmount ?? 0, b.subAmount ?? 0, isAsc);
        case 'total':
          return compare(a.amount ?? 0, b.amount ?? 0, isAsc);
        default:
          return 0;
      }
    });
  });

  dataSource = computed(() => {
    const data = this.sortedList();
    const pageIndex = this.pageIndex();
    const pageSize = this.pageSize();
    return data.slice(pageIndex * pageSize, (pageIndex + 1) * pageSize);
  });

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

  /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
  displayedColumns = ['group', 'name', 'subAmount', 'total'];

  focusDate(event: Event) {
    event.preventDefault();
    this.form().focusBoundControl();
  }

  show() {
    const date = this.getDate();
    this.router.navigate(['balance-sheet', date]);
  }

  getDate(): string {
    const formModel = this.formModel();
    return moment(formModel.date).format('DD-MMM-YYYY');
  }

  handlePageEvent(e: PageEvent) {
    this.pageSize.set(e.pageSize);
    this.pageIndex.set(e.pageIndex);
  }

  sortData(sort: Sort) {
    this.sortActive.set(sort.active);
    this.sortDirection.set(sort.direction);
  }
}
const compare = (a: string | number | boolean, b: string | number | boolean, isAsc: boolean) =>
  (a < b ? -1 : 1) * (isAsc ? 1 : -1);