import { Component, linkEvent } from 'inferno';
import { Subscription } from "rxjs";
import { retryWhen, delay, take } from 'rxjs/operators';
import { CommunityForm as CommunityFormI, UserOperation, Category, ListCategoriesResponse, CommunityResponse } from '../interfaces';
import { WebSocketService } from '../services';
import { msgOp } from '../utils';
import * as autosize from 'autosize';

import { Community } from '../interfaces';

interface CommunityFormProps {
  community?: Community; // If a community is given, that means this is an edit
  onCancel?(): any;
  onCreate?(community: Community): any;
  onEdit?(community: Community): any;
}

interface CommunityFormState {
  communityForm: CommunityFormI;
  categories: Array<Category>;
  loading: boolean;
}

export class CommunityForm extends Component<CommunityFormProps, CommunityFormState> {
  private subscription: Subscription;

  private emptyState: CommunityFormState = {
    communityForm: {
      name: null,
      title: null,
      category_id: null
    },
    categories: [],
    loading: false
  }

  constructor(props: any, context: any) {
    super(props, context);

    this.state = this.emptyState;

    if (this.props.community) {
      this.state.communityForm = {
        name: this.props.community.name,
        title: this.props.community.title,
        category_id: this.props.community.category_id,
        description: this.props.community.description,
        edit_id: this.props.community.id,
        auth: null
      }
    }

    this.subscription = WebSocketService.Instance.subject
      .pipe(retryWhen(errors => errors.pipe(delay(3000), take(10))))
      .subscribe(
        (msg) => this.parseMessage(msg),
        (err) => console.error(err),
        () => console.log("complete")
      );

    WebSocketService.Instance.listCategories();
  }

  componentDidMount() {
    autosize(document.querySelectorAll('textarea'));
  }

  componentWillUnmount() {
    this.subscription.unsubscribe();
  }


  render() {
    return (
      <form onSubmit={linkEvent(this, this.handleCreateCommunitySubmit)}>
        <div class="form-group row">
          <label class="col-12 col-form-label">Name</label>
          <div class="col-12">
            <input type="text" class="form-control" value={this.state.communityForm.name} onInput={linkEvent(this, this.handleCommunityNameChange)} required minLength={3} maxLength={20} pattern="[a-z0-9_]+" title="lowercase, underscores, and no spaces."/>
          </div>
        </div>
        <div class="form-group row">
          <label class="col-12 col-form-label">Title</label>
          <div class="col-12">
            <input type="text" value={this.state.communityForm.title} onInput={linkEvent(this, this.handleCommunityTitleChange)} class="form-control" required minLength={3} maxLength={100} />
          </div>
        </div>
        <div class="form-group row">
          <label class="col-12 col-form-label">Sidebar</label>
          <div class="col-12">
            <textarea value={this.state.communityForm.description} onInput={linkEvent(this, this.handleCommunityDescriptionChange)} class="form-control" rows={3} maxLength={10000} />
          </div>
        </div>
        <div class="form-group row">
          <label class="col-12 col-form-label">Category</label>
          <div class="col-12">
            <select class="form-control" value={this.state.communityForm.category_id} onInput={linkEvent(this, this.handleCommunityCategoryChange)}>
              {this.state.categories.map(category =>
                <option value={category.id}>{category.name}</option>
              )}
            </select>
          </div>
        </div>
        <div class="form-group row">
          <div class="col-12">
            <button type="submit" class="btn btn-secondary mr-2">
              {this.state.loading ? 
              <svg class="icon icon-spinner spin"><use xlinkHref="#icon-spinner"></use></svg> : 
              this.props.community ? 'Save' : 'Create'}</button>
              {this.props.community && <button type="button" class="btn btn-secondary" onClick={linkEvent(this, this.handleCancel)}>Cancel</button>}
          </div>
        </div>
      </form>
    );
  }

  handleCreateCommunitySubmit(i: CommunityForm, event: any) {
    event.preventDefault();
    i.state.loading = true;
    if (i.props.community) {
      WebSocketService.Instance.editCommunity(i.state.communityForm);
    } else {
      WebSocketService.Instance.createCommunity(i.state.communityForm);
    }
    i.setState(i.state);
  }

  handleCommunityNameChange(i: CommunityForm, event: any) {
    i.state.communityForm.name = event.target.value;
    i.setState(i.state);
  }

  handleCommunityTitleChange(i: CommunityForm, event: any) {
    i.state.communityForm.title = event.target.value;
    i.setState(i.state);
  }

  handleCommunityDescriptionChange(i: CommunityForm, event: any) {
    i.state.communityForm.description = event.target.value;
    i.setState(i.state);
  }

  handleCommunityCategoryChange(i: CommunityForm, event: any) {
    i.state.communityForm.category_id = Number(event.target.value);
    i.setState(i.state);
  }

  handleCancel(i: CommunityForm) {
    i.props.onCancel();
  }

  parseMessage(msg: any) {
    let op: UserOperation = msgOp(msg);
    console.log(msg);
    if (msg.error) {
      alert(msg.error);
      this.state.loading = false;
      this.setState(this.state);
      return;
    } else if (op == UserOperation.ListCategories){
      let res: ListCategoriesResponse = msg;
      this.state.categories = res.categories;
      if (!this.props.community) {
        this.state.communityForm.category_id = res.categories[0].id;
      }
      this.setState(this.state);
    } else if (op == UserOperation.CreateCommunity) {
      let res: CommunityResponse = msg;
      this.state.loading = false;
      this.props.onCreate(res.community);
    } 

    // TODO is this necessary?
    else if (op == UserOperation.EditCommunity) {
      let res: CommunityResponse = msg;
      this.state.loading = false;
      this.props.onEdit(res.community);
    }
  }

}