import { CommonModule } from '@angular/common';
import { Component, inject, computed, linkedSignal, input } from '@angular/core';
import { form, FormField, required } from '@angular/forms/signals';
import { MatButtonModule } from '@angular/material/button';
import { MatCheckboxModule } from '@angular/material/checkbox';
import { MatDatepickerModule } from '@angular/material/datepicker';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatIconModule } from '@angular/material/icon';
import { MatInputModule } from '@angular/material/input';
import { MatSelectModule } from '@angular/material/select';
import { MatTableModule } from '@angular/material/table';
import { Router } from '@angular/router';
import { DateTime } from 'luxon';

import { SaleCategoryService } from '../sale-category/sale-category.service';
import { ErrorStateComponent } from '../shared/error-state/error-state.component';
import { SkeletonLoaderComponent } from '../shared/skeleton-loader/skeleton-loader.component';
import { ToCsvService } from '../shared/to-csv.service';
import { BeerSaleExportHeaderInterface } from './beer-sale-export-header-interface';
import { BeerSaleReport } from './beer-sale-report';
import { BeerSaleReportService } from './beer-sale-report.service';

export interface BeerSaleReportFormData {
  startDate: DateTime;
  finishDate: DateTime;
  saleCategory: string;
  regular: boolean;
  happy: boolean;
  staff: boolean;
  nc: boolean;
}

@Component({
  selector: 'app-beer-sale-report',
  templateUrl: './beer-sale-report.component.html',
  styleUrls: ['./beer-sale-report.component.css'],
  imports: [
    CommonModule,
    MatButtonModule,
    MatCheckboxModule,
    MatDatepickerModule,
    MatFormFieldModule,
    MatIconModule,
    MatInputModule,
    MatSelectModule,
    MatTableModule,
    FormField,
    ErrorStateComponent,
    SkeletonLoaderComponent,
  ],
})
export class BeerSaleReportComponent {
  private router = inject(Router);
  private toCsv = inject(ToCsvService);
  private ser = inject(BeerSaleReportService);
  private saleCategoryService = inject(SaleCategoryService);
  startDate = input(null, { transform: (v: string | null | undefined) => v ?? null });
  finishDate = input(null, { transform: (v: string | null | undefined) => v ?? null });
  saleCategory = input(null, { transform: (v: string | null | undefined) => v ?? null });
  regular = input(true, { transform: (v: string | null | undefined) => v !== 'false' });
  happy = input(true, { transform: (v: string | null | undefined) => v !== 'false' });
  staff = input(true, { transform: (v: string | null | undefined) => v !== 'false' });
  nc = input(true, { transform: (v: string | null | undefined) => v !== 'false' });

  saleCategoriesResource = this.saleCategoryService.list();
  infoResource = this.ser.get(
    this.startDate,
    this.finishDate,
    this.saleCategory,
    this.regular,
    this.happy,
    this.staff,
    this.nc,
  );

  saleCategories = computed(() => this.saleCategoriesResource.value() ?? []);
  info = computed(() => this.infoResource.value());
  dataSource = computed(() => this.info()?.data ?? []);
  formModel = linkedSignal({
    source: () => this.info(),
    computation: (info): BeerSaleReportFormData => {
      if (info) {
        return {
          startDate: DateTime.fromFormat(info.startDate, 'dd-MMM-yyyy'),
          finishDate: DateTime.fromFormat(info.finishDate, 'dd-MMM-yyyy'),
          saleCategory: info.saleCategory?.id ?? '',
          regular: info.regular,
          happy: info.happy,
          staff: info.staff,
          nc: info.nc,
        };
      }
      return {
        startDate: DateTime.now(),
        finishDate: DateTime.now(),
        saleCategory: '',
        regular: true,
        happy: true,
        staff: true,
        nc: true,
      };
    },
  });

  form = form(this.formModel, (schemaPath) => {
    required(schemaPath.saleCategory, { message: 'Sale Category is required' });
  });

  /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
  displayedColumns = computed(() => {
    const headers = this.info()?.headers ?? [];
    return ['date'].concat(headers);
  });

  show() {
    const info = this.getInfo();
    this.router.navigate(['beer-sale-report'], {
      queryParams: {
        startDate: info.startDate,
        finishDate: info.finishDate,
        saleCategory: info.saleCategory?.id ?? '',
        regular: info.regular,
        happy: info.happy,
        staff: info.staff,
        nc: info.nc,
      },
    });
  }

  getInfo(): BeerSaleReport {
    const formModel = this.formModel();

    return new BeerSaleReport({
      startDate: formModel.startDate.toFormat('dd-MMM-yyyy'),
      finishDate: formModel.finishDate.toFormat('dd-MMM-yyyy'),
      saleCategory: this.saleCategories().find((sc) => sc.id === formModel.saleCategory),
      regular: formModel.regular,
      happy: formModel.happy,
      staff: formModel.staff,
      nc: formModel.nc,
    });
  }

  exportCsv() {
    const currentInfo = this.info();
    if (!currentInfo) return;

    const init: BeerSaleExportHeaderInterface = { Date: 'date' };
    const headers = currentInfo.headers.reduce(
      (a: Record<string, string>, c: string) => {
        a[c] = c;
        return a;
      },
      init as Record<string, string>,
    );
    const csvData = new Blob([this.toCsv.toCsv(headers, currentInfo.data)], {
      type: 'text/csv;charset=utf-8;',
    });
    const link = document.createElement('a');
    link.href = window.URL.createObjectURL(csvData);
    link.setAttribute('download', 'beer-sale-report.csv');
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
  }
}