import {Component, OnDestroy, OnInit} from '@angular/core';
import {Subscription} from "rxjs";
import {FormControl, FormGroup, Validators} from "@angular/forms";
import {debounceTime, distinctUntilChanged, map} from "rxjs/operators";
import {ProductsService} from "../services/products.service";
import {Product, ProductType} from "../model/product";
import {ActivatedRoute} from "@angular/router";
import {AlertService} from "../services/alert.service";
import {SchedblocksService} from "../services/schedblocks.service";
import {
  faFastBackward,
  faFastForward,
  faMinus,
  faPlus,
  faStepBackward,
  faStepForward,
  faSyncAlt
} from "@fortawesome/free-solid-svg-icons";
import {FiltersService} from "../services/filters.service";
import {Epoch} from "../model/epoch";
import {Setting} from "../model/setting";
import {SettingsService} from "../services/settings.service";

@Component({
  selector: 'app-products',
  templateUrl: './products.component.html',
  styleUrls: ['./products.component.scss']
})
export class ProductsComponent implements OnInit, OnDestroy {

  public epochs: Array<Epoch>;
  public types: Array<ProductType>;
  public statuses: Array<string>;
  public pattern: string = "";

  private filters$: Subscription;
  public filters: any;
  public sortColumns: Array<string>;
  public sortDirections: Array<string>;

  private readonly settings$: Subscription;
  public canDeleteProducts = false;

  public showImageDetails: boolean = false;

  public products: Array<Product> = [];
  public products$: Subscription;

  public resultsPerPage: number = 100;
  public currentPage: number = 1;
  public numResults: number = 0;
  public pages: number = 1;
  private pages$: Subscription;

  public faSyncAlt = faSyncAlt;

  public formGroup: FormGroup;

  showNewForm: boolean = false;

  productFormGroup: FormGroup;

  public faPlus = faPlus;
  public faMinus = faMinus;
  public faFastBackward = faFastBackward;
  public faStepBackward = faStepBackward;
  public faFastForward = faFastForward;
  public faStepForward = faStepForward;

  constructor(
    private schedblockService: SchedblocksService,
    private productService: ProductsService,
    private route: ActivatedRoute,
    private alertService: AlertService,
    private filterService: FiltersService,
    private settingsService: SettingsService) {
    this.epochs = this.filterService.getFilter('EPOCH');
    this.types = this.filterService.getFilter('PRODUCT_TYPE');
    this.statuses = this.filterService.getFilter('PRODUCT_STATUS');
    this.settings$ = this.settingsService.getSettings().subscribe((s: Setting) => {
      if (s) {
        this.canDeleteProducts = s.allowProductDeletion;
      } else {
        this.canDeleteProducts = false;
      }
    }, error => {
      this.canDeleteProducts = false;
    });
    this.sortColumns = this.filterService.getFilter('PRODUCT_SORT');
    this.sortDirections = this.filterService.getFilter('SORT_DIRECTION');
  }

  ngOnInit() {
    this.productFormGroup = new FormGroup({
      epoch: new FormControl(null, Validators.required),
      sbname: new FormControl(null, {validators: Validators.required, updateOn: "blur"}),
      sbid: new FormControl(null, [Validators.required, Validators.min(1), Validators.max(999999999)]),
      minitiles: new FormControl(null, Validators.required)
    });

    this.productFormGroup.get('sbname').valueChanges.subscribe((value: string) => {
      if (this.productFormGroup.get('minitiles').pristine) {
        this.productFormGroup.get('minitiles').setValue(value.replace(/\./g, ','));
      }
    });

    this.formGroup = new FormGroup({
      pattern: new FormControl()
    });

    this.route.queryParams.subscribe(params => {
      if (params.hasOwnProperty('pattern')) {
        this.pattern = params.pattern;
        this.formGroup.get('pattern').setValue(params.pattern);
      }
      if (params.hasOwnProperty('type')) {
        const paramType = Product.getTypeFromName(params.type);
        if (paramType) {
          this.filterService.setCurrentSetting('PRODUCT_TYPE', paramType);
        }
      }
      if (params.hasOwnProperty('epoch')) {
        const paramEpoch = Epoch.getEpochFromId(params.epoch);
        if (paramEpoch) {
          this.filterService.setCurrentSetting('EPOCHS', paramEpoch);
        }
      }
    });

    this.formGroup.get('pattern').valueChanges.pipe(
      debounceTime(400),
      distinctUntilChanged(),
      map(results => results)
    ).subscribe((val: string) => {
      this.pattern = val;
      this.getPageInfoAndProduct();
    });

    this.filters$ = this.filterService.currentSettings$.subscribe((filters: object) => {
      this.filters = filters;
      for (const allowed of this.generateProductEpochs()) {
        if (filters['EPOCH'].id === allowed.id) {
          this.productFormGroup.get('epoch').setValue(filters['EPOCH'].id);
        }
        let showTypes = [
          'quicklook',
          'se_cont',
          'se_coarse_cube_image',
          'se_coarse_plane_image',
          'se_coarse_plane_I_image',
          'se_coarse_plane_Q_image',
          'se_coarse_plane_U_image'
        ];
        this.showImageDetails = showTypes.indexOf(filters['PRODUCT_TYPE'].name) > -1;
      }
      this.getPageInfoAndProduct();
    });
  }

  setEpoch(epoch: Epoch) {
    this.filterService.setCurrentSetting('EPOCH', epoch);
  }

  setType(type: ProductType) {
    this.filterService.setCurrentSetting('PRODUCT_TYPE', type);
  }

  setStatus(status: string) {
    this.filterService.setCurrentSetting('PRODUCT_STATUS', status);
  }

  setSortColumn(column: string): void {
    this.filterService.setCurrentSetting('PRODUCT_SORT', column);
  }

  setSortDirection(direction: string): void {
    this.filterService.setCurrentSetting('SORT_DIRECTION', direction);
  }

  getPrettyName(name: string): string {
    return FiltersService.prettyName(name);
  }

  goToPage(page: number): boolean {
    if (page < 1) {
      page = 1;
    }
    if (page > this.pages) {
      page = this.pages;
    }
    if (this.currentPage == page) {
      return false;
    }
    this.currentPage = page;
    this.getProducts();
  }

  getPages(): Array<any> {
    return new Array(this.pages);
  }

  getPageCount(): void {
    const epoch = this.filterService.getCurrentSetting('EPOCH');
    const type = this.filterService.getCurrentSetting('PRODUCT_TYPE');
    this.pages$ = this.productService.getRecordCount(epoch.id, type.id, this.pattern).subscribe((productNumber: number) => {
      this.numResults = productNumber;
      this.pages = Math.ceil(productNumber / this.resultsPerPage);
      if (this.currentPage > this.pages) {
        this.currentPage = this.pages;
      }
      if (this.currentPage < 1) {
        this.currentPage = 1;
      }
      this.getProducts();
    });
  }

  getProducts(): void {
    // clear a previous call
    if (this.products$) {
      this.products$.unsubscribe();
    }
    this.products = null;
    const epoch = this.filterService.getCurrentSetting('EPOCH');
    const type = this.filterService.getCurrentSetting('PRODUCT_TYPE');
    this.alertService.info('Getting ' + type.label);
    this.products$ = this.productService.getPage(epoch.id, type.id, this.currentPage - 1, this.pattern).subscribe((products: Array<Product>) => {
      if (products && products.length > 0) {
        this.alertService.success(type.label + ' loaded.');
        this.products = products;
      } else {
        this.products = [];
        this.alertService.error('No ' + type.label + ' found.')
      }
    });
  }

  getProductById(id: string): void {
    // clear a previous call
    if (this.products$) {
      this.products$.unsubscribe();
    }
    this.products$ = this.productService.getProductById(id).subscribe((product: Product) => {
      this.products = [product];
      this.numResults = 1;
      this.pages = 1;
      this.currentPage = 1;
    });
  }

  getPageInfoAndProduct(): void {
    let possible_id = parseInt(this.pattern);
    if (isNaN(possible_id)) {
      this.getPageCount();
      this.getProducts();
    } else {
      this.getProductById(possible_id.toString());
    }
  }

  generateProductEpochs(): Array<Epoch> {
    const allowedEpochs = [];
    // dont allow epoch1 or pilot
    for (const e of this.epochs) {
      if (e.id !== 0 && e.id !== 1) {
        allowedEpochs.push(e);
      }
    }
    return allowedEpochs;
  }

  generateProduct() {
    this.alertService.info('Generating products...');
    if (this.productFormGroup.valid) {
      this.schedblockService.createSchedblock(
        this.productEpoch.value,
        this.productSBname.value,
        this.productsbId.value,
        this.productMinitiles.value
      ).subscribe(response => {
        this.alertService.success('Products Generated');
        this.getProducts();
      }, (error) => {
        this.alertService.error('Product generating failed');
      });
    } else {
      this.alertService.error('Invalid values in the form');
      console.log(this.productFormGroup.value);
    }
  }

  /**
   * conveinence getters for the form
   */
  get productEpoch(): FormControl {
    return this.productFormGroup.get('epoch') as FormControl;
  }
  get productSBname(): FormControl {
    return this.productFormGroup.get('sbname') as FormControl;
  }
  get productsbId(): FormControl {
    return this.productFormGroup.get('sbid') as FormControl;
  }
  get productMinitiles(): FormControl {
    return this.productFormGroup.get('minitiles') as FormControl;
  }

  ngOnDestroy(): void {
    if (this.pages$) {
      this.pages$.unsubscribe();
    }
    if (this.products$) {
      this.products$.unsubscribe();
    }
    if (this.filters$) {
      this.filters$.unsubscribe();
    }
    if (this.settings$) {
      this.settings$.unsubscribe();
    }
  }

}