import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
import { Page, ResourceType, Protocol, WfHistoryEntry, SimpleResource, Context, ContextNode, Vocabulary, VocabularyTerm, KeyValue, BrowseTerm, Datasource } from './model/controller.model';
import { Observable, Observer } from 'rxjs';
import { FormGroup } from '@angular/forms';
import { MatSnackBar } from '@angular/material/snack-bar';

@Injectable({
  providedIn: 'root'
})
export class ISService {

  constructor(public client: HttpClient, public snackBar: MatSnackBar) { }

  loadResourceTypes(onSuccess: Function): void {
    this.client.get<ResourceType[]>("/ajax/resourceTypes").subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadResourceType(id: string, onSuccess: Function): void {
    this.client.get<ResourceType>("/ajax/resourceTypes/" + encodeURIComponent(id)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadInfo(onSuccess: Function): void {
    this.client.get<any[]>("/ajax/info/").subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadProtocols(onSuccess: Function): void {
    this.client.get<Protocol[]>("/ajax/protocols/").subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadSimpleResources(type: string, onSuccess: Function): void {
    this.client.get<SimpleResource[]>("/ajax/resources/" + encodeURIComponent(type)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadSimpleResourceContent(id: any, onSuccess: Function): void {
    const headers = new HttpHeaders().set('Content-Type', 'text/plain; charset=utf-8');
    this.client.get<string>("/ajax/resources/" + encodeURIComponent(id) + '/content', {
      headers, responseType: 'text' as 'json'
    }).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  saveSimpleResourceMedatata(res: SimpleResource, onSuccess: Function, relatedForm?: FormGroup): void {
    this.client.post<void>('/ajax/resources/' + encodeURIComponent(res.id) + '/metadata', res).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error, relatedForm)
    });
  }

  saveSimpleResourceContent(id: string, content: string, onSuccess: Function, relatedForm?: FormGroup): void {
    const headers = new HttpHeaders().set('Content-Type', 'application/x-www-form-urlencoded')
    let body = new HttpParams().set('content', content);
    this.client.post<void>('/ajax/resources/' + encodeURIComponent(id) + '/content', body, { headers: headers }).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error, relatedForm)
    });
  }

  addSimpleResource(name: string, type: string, description: string, content: string, onSuccess: Function, relatedForm?: FormGroup): void {
    const headers = new HttpHeaders().set('Content-Type', 'application/x-www-form-urlencoded')
    let body = new HttpParams()
      .set('name', name)
      .set('type', type)
      .set('description', description)
      .set('content', content);
    this.client.post<void>('/ajax/resources/', body, { headers: headers }).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error, relatedForm)
    });
  }

  deleteSimpleResource(resourceId: string, onSuccess: Function): void {
    this.client.delete<void>('/ajax/resources/' + encodeURIComponent(resourceId)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadWfHistory(total: number, from: number, to: number, onSuccess: Function): void {
    let params = new HttpParams();
    if (total && total > 0) { params = params.append('total', total); }
    if (from && from > 0) { params = params.append('from', from); }
    if (to && to > 0) { params = params.append('to', to); }

    this.client.get<WfHistoryEntry[]>('/ajax/wfs/', { params: params }).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadContexts(onSuccess: Function): void {
    this.client.get<Context[]>('./ajax/contexts/').subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadContext(ctxId:string, onSuccess: Function): void {
    this.client.get<Context>('./ajax/contexts/' + encodeURIComponent(ctxId)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadContextCategories(ctxId:string, onSuccess: Function): void {
    this.client.get<ContextNode[]>('./ajax/contexts/' + encodeURIComponent(ctxId) + '/categories').subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadContextConcepts(level:number, nodeId:string, onSuccess: Function): void {
    this.client.get<ContextNode[]>('./ajax/contexts/' + encodeURIComponent(level) + '/' + encodeURIComponent(nodeId) + '/concepts').subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadVocabularies(onSuccess: Function): void {
    this.client.get<Vocabulary[]>('./ajax/vocs/').subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadVocabulary(vocId:string, onSuccess: Function): void {
    this.client.get<Vocabulary>('./ajax/vocs/' + encodeURIComponent(vocId)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  loadVocabularyTerms(vocId:string, onSuccess: Function): void {
    this.client.get<VocabularyTerm[]>('./ajax/vocs/' + encodeURIComponent(vocId) + '/terms').subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  saveVocabulary(voc:Vocabulary, onSuccess: Function, relatedForm?: FormGroup): void {
    this.client.post<void>('./ajax/vocs/', voc).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error, relatedForm)
    });
  }

  saveVocabularyTerm(vocId:string, term:VocabularyTerm, onSuccess: Function, relatedForm?: FormGroup): void {
    this.client.post<void>('./ajax/vocs/' + encodeURIComponent(vocId) + '/terms', term).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error, relatedForm)
    });
  }

  deleteVocabulary(vocId:string, onSuccess: Function): void {
    this.client.delete<void>('./ajax/vocs/' + encodeURIComponent(vocId)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  deleteVocabularyTerm(vocId:string, termCode:string, onSuccess: Function): void {
    this.client.delete<void>('./ajax/vocs/' 
      + encodeURIComponent(vocId) 
      + '/terms/' 
      + encodeURIComponent(termCode)
    ).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  dsmBrowsableFields(onSuccess: Function) {
    this.client.get<KeyValue[]>('./ajax/dsm/browsableFields').subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  dsmBrowse(field:string, onSuccess: Function) {
    this.client.get<BrowseTerm[]>('./ajax/dsm/browse/' + encodeURIComponent(field)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  dsmSearchByField(field:string, value:string, page:number, pageSize:number, onSuccess: Function) {
    this.client.get<Page<Datasource>>('./ajax/dsm/searchByField/' + encodeURIComponent(field) + '/' + page + '/' + pageSize + '?value=' + encodeURIComponent(value)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  dsmSearch(value:string, page:number, pageSize:number, onSuccess: Function) {
    this.client.get<Page<Datasource>>('./ajax/dsm/search/' + page + '/' + pageSize + '?value=' + encodeURIComponent(value)).subscribe({
      next: data => onSuccess(data),
      error: error => this.showError(error)
    });
  }

  private showError(error: any, form?: FormGroup) {
    const msg = this.errorMessage(error);
    if (form) {
      form.setErrors({ serverError: msg })
    } else if (this.snackBar) {
      this.snackBar.open(msg, 'ERROR', {
        duration: 5000,
      });
    } else {
      alert(msg);
    }
  }

  private errorMessage(error: any) {
    if (error.error && error.error.message) {
      return error.error.message;
    } else if (error.message) {
      return error.message;
    } else {
      return 'Generic server side error';
    }
  }

}