import { Component, ApplicationRef, OnInit, OnDestroy, HostListener, ViewChild, ComponentRef } from "@angular/core";
import { Router, Event, NavigationEnd, ActivationEnd } from "@angular/router";

import { Observer, jalhydDateRev } from "jalhyd";

import { environment } from "../environments/environment";
import { InternationalisationService } from "./services/internationalisation/internationalisation.service";
import { ErrorService } from "./services/error/error.service";
import { FormulaireService } from "./services/formulaire/formulaire.service";
import { FormulaireDefinition } from "./formulaire/definition/form-definition";
import { ServiceFactory } from "./services/service-factory";
import { ParamService } from "./services/param/param.service";
import { ApplicationSetupService } from "./services/app-setup/app-setup.service";
import { HttpService } from "./services/http/http.service";
import { LoadCalcDialogAnchorDirective } from "./components/load-calculator/load-calculator-anchor.directive";
import { LoadCalculatorComponent } from "./components/load-calculator/load-calculator.component";
import { SaveCalcDialogAnchorDirective } from "./components/save-calculator/save-calculator-anchor.directive";
import { SaveCalculatorComponent } from "./components/save-calculator/save-calculator.component";
import { nghydDateRev } from "../date_revision";

import { MatSidenav, MatToolbar, MatDialog } from "@angular/material";
import { DialogConfirmEmptySessionComponent } from "./components/dialog-confirm-empty-session/dialog-confirm-empty-session.component";


@Component({
  selector: "nghyd-app",
  templateUrl: "./app.component.html",
  styleUrls: ["./app.component.scss"],
  providers: [ErrorService]
})
export class AppComponent implements OnInit, OnDestroy, Observer {

  @ViewChild("sidenav")
  public sidenav: MatSidenav;

  @ViewChild("navbar")
  public navbar: MatToolbar;

  /** current calculator, inferred from _currentFormId by setActiveCalc() (used for navbar menu) */
  public currentCalc: any;

  /**
   * liste des calculettes. Forme des objets :
   * "title": nom de la calculette
   * "uid": id unique du formulaire
   */
  private _calculators: any[] = [];

  /**
   * id du formulaire courant
   * on utilise pas directement FormulaireService.currentFormId pour éviter l'erreur
   * ExpressionChangedAfterItHasBeenCheckedError
   */
  private _currentFormId: string;

  private _innerWidth: number;

  @ViewChild(LoadCalcDialogAnchorDirective)
  private appLoadCalcDialogAnchor: LoadCalcDialogAnchorDirective;

  @ViewChild(SaveCalcDialogAnchorDirective)
  private appSaveCalcDialogAnchor: SaveCalcDialogAnchorDirective;

  /**
   * composant actuellement affiché par l'élément <router-outlet>
   */
  private _routerCurrentComponent: Component;

  constructor(
    private intlService: InternationalisationService,
    private paramService: ParamService,
    private appSetupService: ApplicationSetupService,
    private appRef: ApplicationRef,
    private errorService: ErrorService,
    private router: Router,
    private formulaireService: FormulaireService,
    private httpService: HttpService,
    private confirmEmptySessionDialog: MatDialog
  ) {
    ServiceFactory.instance.applicationSetupService = appSetupService;
    ServiceFactory.instance.paramService = paramService;
    ServiceFactory.instance.internationalisationService = intlService;
    ServiceFactory.instance.formulaireService = formulaireService;
    ServiceFactory.instance.httpService = httpService;

    this.router.events.subscribe((event: Event) => {
      // close side navigation when clicking a calculator tab
      if (event instanceof NavigationEnd) {
        this.sidenav.close();
      }
      // [de]activate calc tabs depending on loaded route
      if (event instanceof ActivationEnd) {
        const path = event.snapshot.url[0].path;
        if (path === "calculator") {
          const calcUid = event.snapshot.params.uid;
          this.setActiveCalc(calcUid);
        } else {
          this.setActiveCalc(null);
        }
      }
    });
  }

  ngOnInit() {
    this.intlService.addObserver(this);
    this.intlService.setLocale("fr");
    this.formulaireService.addObserver(this);
    this.subscribeErrorService();
    this._innerWidth = window.innerWidth;
  }

  ngOnDestroy() {
    this.unsubscribeErrorService();
    this.formulaireService.removeObserver(this);
  }

  @HostListener("window:resize", ["$event"])
  onResize(event) {
    // keep track of window size for navbar tabs arrangement
    this._innerWidth = window.innerWidth;
  }

  public get uitextSidenavNewCalc() {
    return this.intlService.localizeText("INFO_MENU_NOUVELLE_CALC");
  }

  public get uitextSidenavParams() {
    return this.intlService.localizeText("INFO_SETUP_TITLE");
  }

  public get uitextSidenavLoadSession() {
    return this.intlService.localizeText("INFO_MENU_LOAD_SESSION_TITLE");
  }

  public get uitextSidenavSaveSession() {
    return this.intlService.localizeText("INFO_MENU_SAVE_SESSION_TITLE");
  }

  public get uitextSidenavEmptySession() {
    return this.intlService.localizeText("INFO_MENU_EMPTY_SESSION_TITLE");
  }

  public get uitextSidenavHelp() {
    return this.intlService.localizeText("INFO_MENU_HELP_TITLE");
  }

  public get uitextSelectCalc() {
    return this.intlService.localizeText("INFO_MENU_SELECT_CALC");
  }

  public get calculators() {
    return this._calculators;
  }

  public get currentFormId() {
    return this._currentFormId;
  }

  public setActiveCalc(uid: string) {
    this._calculators.forEach((calc) => {
      calc.active = (calc.uid === uid);
    });
    // mark current calc for navbar menu
    const index = this.getCalculatorIndexFromId(uid);
    this.currentCalc = this._calculators[index];
  }

  /**
   * Returns true if sum of open calculator tabs witdh is lower than navbar
   * available space (ie. if navbar is not overflowing), false otherwise
   */
  public get tabsFitInNavbar() {
    // manual breakpoints
    // @WARNING keep in sync with .calculator-buttons sizes in app.component.scss
    let tabsLimit = 0;
    if (this._innerWidth > 480) {
      tabsLimit = 3;
    }
    if (this._innerWidth > 640) {
      tabsLimit = 4;
    }
    if (this._innerWidth > 800) {
      tabsLimit = 6;
    }
    /*if (this._innerWidth > 1200) {
      tabsLimit = 8;
    }*/

    const fits = this._calculators.length <= tabsLimit;
    return fits;
  }

  /**
   * abonnement au service d'erreurs
   */
  private subscribeErrorService() {
    this.errorService.addObserver(this);
  }

  private unsubscribeErrorService() {
    this.errorService.removeObserver(this);
  }

  private updateLocale() {
    const tag = this.intlService.currentLanguage.tag;
    document["locale"] = tag;

    // location.reload(true);
    // this.cdRef.markForCheck();
    // this.cdRef.detectChanges();
    this.appRef.tick();
  }

  // interface Observer

  update(sender: any, data: any): void {
    if (sender instanceof ErrorService) {
      // on ouvre un dialogue avec le message d'erreur reçu
      // if (this._displayErrorDialog) {
      //   let dialogRef = this.dialog.open(AlertDialog);
      //   let ad: AlertDialog = dialogRef.componentInstance;
      //   ad.text = String(data);
      // }
      // else
      console.log(data);
    } else if (sender instanceof FormulaireService) {
      switch (data["action"]) {
        case "createForm":
          const f: FormulaireDefinition = data["form"];
          this._calculators.push(
            {
              "title": f.calculatorName,
              "type": this.formulaireService.getLocalisedTitleFromCalculatorType(f.calculatorType),
              "uid": f.uid
            }
          );
          this.setActiveCalc(f.uid);

          // abonnement en tant qu'observateur du nouveau formulaire
          f.addObserver(this);
          break;

        case "invalidFormId":
          this.toList();
          break;

        case "currentFormChanged":
          this._currentFormId = data["formId"];
          break;

        case "saveForm":
          this.saveForm(data["form"]);
          break;

        case "closeForm":
          const form: FormulaireDefinition = data["form"];
          this.closeCalculator(form);
          break;
      }
    } else if (sender instanceof InternationalisationService) {
      this.updateLocale();
    } else if (sender instanceof FormulaireDefinition) {
      switch (data["action"]) {
        case "nameChanged":
          this.updateCalculatorTitle(sender, data["name"]);
          break;
      }
    }
  }

  private getCalculatorIndexFromId(formId: string) {
    const index = this._calculators.reduce((resultIndex, calc, currIndex) => {
      if (resultIndex === -1 && calc["uid"] === formId) {
        resultIndex = currIndex;
      }
      return resultIndex;
    }, -1);

    return index;
  }

  private updateCalculatorTitle(f: FormulaireDefinition, title: string) {
    const formIndex = this.getCalculatorIndexFromId(f.uid);
    this._calculators[formIndex]["title"] = title;
  }

  private saveSession(calcList: any[], filename) {
    const elems = [];
    for (const c of calcList) {
      if (c.selected) {
        const form: FormulaireDefinition = this.formulaireService.getFormulaireFromId(c.uid);
        elems.push(form.JSONserialise());
      }
    }
    const session = { "session": { "elements": elems } };
    this.formulaireService.saveSession(session, filename);
  }

  private closeCalculator(form: FormulaireDefinition) {
    const formId: string = form.uid;

    // désabonnement en tant qu'observateur

    form.removeObserver(this);

    // recherche de la calculette correspondante à formId

    const closedIndex = this.getCalculatorIndexFromId(formId);

    /*
     * détermination de la nouvelle calculette à afficher :
     * - celle après celle supprimée
     * - ou celle avant celle supprimée si on supprime la dernière
     */
    let newId = null;
    const l = this._calculators.length;
    if (l > 1) {
      if (closedIndex === l - 1) {
        newId = this._calculators[closedIndex - 1]["uid"];
      } else {
        newId = this._calculators[closedIndex + 1]["uid"];
      }
    }

    // suppression

    this._calculators = this._calculators.filter(calc => {
      return formId !== calc["uid"];
    });

    // MAJ affichage

    if (newId === null) {
      this.toList();
      this._currentFormId = null;
    } else {
      this.toCalc(newId);
    }
  }

  private toList() {
    this.router.navigate(["/list"]);
  }

  private toCalc(id: string) {
    this.router.navigate(["/calculator", id]);
    this.setActiveCalc(id);
  }

  /**
   * récupération du composant affiché par le routeur
   */
  public onRouterOutletActivated(a) {
    this._routerCurrentComponent = a;
  }

  /**
   * restarts a fresh session by closing all calculators
   */
  public emptySession() {
    const dialogRef = this.confirmEmptySessionDialog.open(
      DialogConfirmEmptySessionComponent,
      { disableClose: true }
    );
    dialogRef.afterClosed().subscribe(result => {
      if (result) {
        for (const c of this._calculators) {
          const form = this.formulaireService.getFormulaireFromId(c.uid);
          this.closeCalculator(form);
        }
      }
    });
  }

  public loadSession() {
    // création du dialogue de sélection des formulaires à sauver
    const compRef: ComponentRef<LoadCalculatorComponent> = this.appLoadCalcDialogAnchor.createDialog();

    const prom: Promise<any[]> = compRef.instance.run();
    prom.then(list => {
      this.formulaireService.loadSession(compRef.instance.selectedFile, compRef.instance.calculators);
      compRef.destroy();
    }).catch(err => { });
  }

  public getDateRevision(): string[] {
    const dr: string[] = [jalhydDateRev, nghydDateRev];
    return dr;
  }

  /**
   * sauvegarde du/des formulaires
   * @param form formulaire à sélectionner par défaut dans la liste
   */
  public saveForm(form?: FormulaireDefinition) {
    // création du dialogue de sélection des formulaires à sauver
    const compRef: ComponentRef<SaveCalculatorComponent> = this.appSaveCalcDialogAnchor.createDialog();

    // création de la liste des formulaires
    const list = [];
    for (const c of this._calculators) {
      const uid = c["uid"];
      list.push({
        "selected": form ? (uid === form.uid) : true,
        "title": c["title"],
        "uid": uid
      });
    }

    // passage de la liste, récupération d'une Promise pour traiter le résultat
    const prom: Promise<any[]> = compRef.instance.run(list);
    prom.then(innerList => {
      let name = compRef.instance.filename;

      // ajout extension ".json"
      const re = /.+\.json/;
      const match = re.exec(name.toLowerCase());
      if (match === null) {
        name = name + ".json";
      }

      this.saveSession(innerList, name);
    }).catch(err => { });
  }

  /**
   * détection de la fermeture de la page/navigateur et demande de confirmation
   */
  @HostListener("window:beforeunload", ["$event"])
  confirmExit($event) {
    if (environment.production) {
      // affecter une valeur différente de null provoque l'affichage d'un dialogue de confirmation, mais le texte n'est pas affiché
      $event.returnValue = "Your data will be lost !";
    }
  }
}