import {Component, OnDestroy, OnInit} from '@angular/core';
import {LecturerInfoService} from 'src/app/services/lecturer-info.service';
import {LecturerDataService} from 'src/app/services/lecturer-data.service';
import {LecturerViewService} from 'src/app/services/lecturer-view.service';
import {Router} from '@angular/router';
import {QuestionDao} from 'src/app/dao/question.dao';
import {OmpClassDao} from 'src/app/dao/omp-class.dao';
import {MinutePaperDao} from 'src/app/dao/minute-paper.dao';
import {MinutePaperWrapperDao} from 'src/app/dao/minute-paper-wrapper.dao';

@Component({
  selector: 'app-lecturer-create-omp-view',
  templateUrl: './lecturer-create-omp-view.component.html',
  styleUrls: ['./lecturer-create-omp-view.component.css']
})
export class LecturerCreateOmpViewComponent implements OnInit, OnDestroy {

  public isTemplate: Boolean;
  public questions: QuestionDao[];
  public classes: OmpClassDao[];
  public templates: MinutePaperWrapperDao[];
  public name: String;
  public topic: String;
  public isAnonymous: Boolean;
  public currentClass: OmpClassDao;
  public currentTemplate: MinutePaperWrapperDao;

  constructor(private lecturerInfoService: LecturerInfoService,
              private lecturerDataService: LecturerDataService,
              private lecturerViewService: LecturerViewService,
              private router: Router) {
  }

  ngOnInit(): void {
    this.questions = [];
    this.classes = [];
    this.templates = [];
    this.initialiseForms();
  }

  ngOnDestroy(): void {
    this.questions = [];
    this.classes = [];
    this.templates = [];
  }

  private getClasses(): void {
    this.lecturerInfoService.getLecturerClasses(this.lecturerDataService.lecturerId)
      .subscribe((data: OmpClassDao[]) => data.forEach(e => {
        this.classes.push(e);
        this.currentClass = this.classes[0];
      }));
  }

  private initialiseForms(): void {
    this.isTemplate = this.lecturerDataService.isTemplate;
    this.getClasses();
    this.getTemplates();
    this.templates.push(new MinutePaperWrapperDao(new MinutePaperDao('-1', 'default', 'default', 'No Template', '',
      true, true, '0000-00-00'), []));
    this.resetForm();
  }

  private createWrapperObject() {
    const paper = new MinutePaperDao('0', this.lecturerDataService.lecturerId, this.currentClass.classCode,
      this.name, this.topic, this.isTemplate, this.isAnonymous, '0000-00-00');
    return new MinutePaperWrapperDao(paper, this.questions);
  }

  private getTemplates() {
    this.lecturerInfoService.getTemplates(this.lecturerDataService.lecturerId)
      .subscribe((data: MinutePaperWrapperDao[]) => data.forEach(e => {this.templates.push(e); }));
  }

  private findClass(classCode: String) {
    for (const ompclass of this.classes) {
      if (ompclass.classCode === classCode) {
        this.currentClass = ompclass;
      }
    }
  }

  private resetForm() {
    this.questions = [];
    this.addQuestion();
    this.isAnonymous = false;
    this.name = 'Enter a name...';
    this.topic = 'Enter a topic...';
    this.currentClass = this.classes[0];
    this.currentTemplate = this.templates[0];
  }

  // TODO check if form has been modified at all
  public setTemplate() {
    if (this.currentTemplate.paper.paperId !== '-1') {
      this.questions = [];
      this.questions = this.currentTemplate.questions;
      this.isAnonymous = this.currentTemplate.paper.anonymous;
      this.name = this.currentTemplate.paper.name;
      this.topic = this.currentTemplate.paper.topic;
      this.findClass(this.currentTemplate.paper.classCode);
    } else {
      this.resetForm();
    }
  }

  public createPaper(): void {
    this.lecturerInfoService.createPaper(this.createWrapperObject()).subscribe();
  }

  public createTemplate(): void {
    this.lecturerInfoService.createTemplate(this.createWrapperObject()).subscribe();
  }

  public flipIsAnonymous(): void {
    this.isAnonymous = !this.isAnonymous;
  }

  public addQuestion(): void {
    this.questions.push(new QuestionDao('0', '0', 'Enter your question text!'));
  }

  public removeQuestion(index: number): void {
    this.questions.splice(index, 1);
  }
}