import { Component, linkEvent } from "inferno";
import { Prompt } from "inferno-router";
import {
  CommunityResponse,
  CommunityView,
  CreateCommunity,
  EditCommunity,
  Language,
  UserOperation,
  wsJsonToRes,
  wsUserOp,
} from "lemmy-js-client";
import { Subscription } from "rxjs";
import { i18n } from "../../i18next";
import { UserService, WebSocketService } from "../../services";
import {
  capitalizeFirstLetter,
  myAuth,
  randomStr,
  wsClient,
  wsSubscribe,
} from "../../utils";
import { Icon, Spinner } from "../common/icon";
import { ImageUploadForm } from "../common/image-upload-form";
import { LanguageSelect } from "../common/language-select";
import { MarkdownTextArea } from "../common/markdown-textarea";

interface CommunityFormProps {
  community_view?: CommunityView; // If a community is given, that means this is an edit
  allLanguages: Language[];
  siteLanguages: number[];
  communityLanguages?: number[];
  onCancel?(): any;
  onCreate?(community: CommunityView): any;
  onEdit?(community: CommunityView): any;
  enableNsfw?: boolean;
}

interface CommunityFormState {
  form: {
    name?: string;
    title?: string;
    description?: string;
    icon?: string;
    banner?: string;
    nsfw?: boolean;
    posting_restricted_to_mods?: boolean;
    discussion_languages?: number[];
  };
  loading: boolean;
}

export class CommunityForm extends Component<
  CommunityFormProps,
  CommunityFormState
> {
  private id = `community-form-${randomStr()}`;
  private subscription?: Subscription;

  state: CommunityFormState = {
    form: {},
    loading: false,
  };

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

    this.handleCommunityDescriptionChange =
      this.handleCommunityDescriptionChange.bind(this);

    this.handleIconUpload = this.handleIconUpload.bind(this);
    this.handleIconRemove = this.handleIconRemove.bind(this);

    this.handleBannerUpload = this.handleBannerUpload.bind(this);
    this.handleBannerRemove = this.handleBannerRemove.bind(this);

    this.handleDiscussionLanguageChange =
      this.handleDiscussionLanguageChange.bind(this);

    this.parseMessage = this.parseMessage.bind(this);
    this.subscription = wsSubscribe(this.parseMessage);
    let cv = this.props.community_view;

    if (cv) {
      this.state = {
        form: {
          name: cv.community.name,
          title: cv.community.title,
          description: cv.community.description,
          nsfw: cv.community.nsfw,
          icon: cv.community.icon,
          banner: cv.community.banner,
          posting_restricted_to_mods: cv.community.posting_restricted_to_mods,
          discussion_languages: this.props.communityLanguages,
        },
        loading: false,
      };
    }
  }

  componentDidUpdate() {
    if (
      !this.state.loading &&
      (this.state.form.name ||
        this.state.form.title ||
        this.state.form.description)
    ) {
      window.onbeforeunload = () => true;
    } else {
      window.onbeforeunload = null;
    }
  }

  componentWillUnmount() {
    this.subscription?.unsubscribe();
    window.onbeforeunload = null;
  }

  render() {
    return (
      <>
        <Prompt
          when={
            !this.state.loading &&
            (this.state.form.name ||
              this.state.form.title ||
              this.state.form.description)
          }
          message={i18n.t("block_leaving")}
        />
        <form onSubmit={linkEvent(this, this.handleCreateCommunitySubmit)}>
          {!this.props.community_view && (
            <div className="form-group row">
              <label
                className="col-12 col-sm-2 col-form-label"
                htmlFor="community-name"
              >
                {i18n.t("name")}
                <span
                  className="position-absolute pointer unselectable ml-2 text-muted"
                  data-tippy-content={i18n.t("name_explain")}
                >
                  <Icon icon="help-circle" classes="icon-inline" />
                </span>
              </label>
              <div className="col-12 col-sm-10">
                <input
                  type="text"
                  id="community-name"
                  className="form-control"
                  value={this.state.form.name}
                  onInput={linkEvent(this, this.handleCommunityNameChange)}
                  required
                  minLength={3}
                  pattern="[a-z0-9_]+"
                  title={i18n.t("community_reqs")}
                />
              </div>
            </div>
          )}
          <div className="form-group row">
            <label
              className="col-12 col-sm-2 col-form-label"
              htmlFor="community-title"
            >
              {i18n.t("display_name")}
              <span
                className="position-absolute pointer unselectable ml-2 text-muted"
                data-tippy-content={i18n.t("display_name_explain")}
              >
                <Icon icon="help-circle" classes="icon-inline" />
              </span>
            </label>
            <div className="col-12 col-sm-10">
              <input
                type="text"
                id="community-title"
                value={this.state.form.title}
                onInput={linkEvent(this, this.handleCommunityTitleChange)}
                className="form-control"
                required
                minLength={3}
                maxLength={100}
              />
            </div>
          </div>
          <div className="form-group row">
            <label className="col-12 col-sm-2">{i18n.t("icon")}</label>
            <div className="col-12 col-sm-10">
              <ImageUploadForm
                uploadTitle={i18n.t("upload_icon")}
                imageSrc={this.state.form.icon}
                onUpload={this.handleIconUpload}
                onRemove={this.handleIconRemove}
                rounded
              />
            </div>
          </div>
          <div className="form-group row">
            <label className="col-12 col-sm-2">{i18n.t("banner")}</label>
            <div className="col-12 col-sm-10">
              <ImageUploadForm
                uploadTitle={i18n.t("upload_banner")}
                imageSrc={this.state.form.banner}
                onUpload={this.handleBannerUpload}
                onRemove={this.handleBannerRemove}
              />
            </div>
          </div>
          <div className="form-group row">
            <label className="col-12 col-sm-2 col-form-label" htmlFor={this.id}>
              {i18n.t("sidebar")}
            </label>
            <div className="col-12 col-sm-10">
              <MarkdownTextArea
                initialContent={this.state.form.description}
                placeholder={i18n.t("description")}
                onContentChange={this.handleCommunityDescriptionChange}
                allLanguages={[]}
                siteLanguages={[]}
              />
            </div>
          </div>

          {this.props.enableNsfw && (
            <div className="form-group row">
              <legend className="col-form-label col-sm-2 pt-0">
                {i18n.t("nsfw")}
              </legend>
              <div className="col-10">
                <div className="form-check">
                  <input
                    className="form-check-input position-static"
                    id="community-nsfw"
                    type="checkbox"
                    checked={this.state.form.nsfw}
                    onChange={linkEvent(this, this.handleCommunityNsfwChange)}
                  />
                </div>
              </div>
            </div>
          )}
          <div className="form-group row">
            <legend className="col-form-label col-6 pt-0">
              {i18n.t("only_mods_can_post_in_community")}
            </legend>
            <div className="col-6">
              <div className="form-check">
                <input
                  className="form-check-input position-static"
                  id="community-only-mods-can-post"
                  type="checkbox"
                  checked={this.state.form.posting_restricted_to_mods}
                  onChange={linkEvent(
                    this,
                    this.handleCommunityPostingRestrictedToMods
                  )}
                />
              </div>
            </div>
          </div>
          <LanguageSelect
            allLanguages={this.props.allLanguages}
            siteLanguages={this.props.siteLanguages}
            showSite
            selectedLanguageIds={this.state.form.discussion_languages}
            multiple={true}
            onChange={this.handleDiscussionLanguageChange}
          />
          <div className="form-group row">
            <div className="col-12">
              <button
                type="submit"
                className="btn btn-secondary mr-2"
                disabled={this.state.loading}
              >
                {this.state.loading ? (
                  <Spinner />
                ) : this.props.community_view ? (
                  capitalizeFirstLetter(i18n.t("save"))
                ) : (
                  capitalizeFirstLetter(i18n.t("create"))
                )}
              </button>
              {this.props.community_view && (
                <button
                  type="button"
                  className="btn btn-secondary"
                  onClick={linkEvent(this, this.handleCancel)}
                >
                  {i18n.t("cancel")}
                </button>
              )}
            </div>
          </div>
        </form>
      </>
    );
  }

  handleCreateCommunitySubmit(i: CommunityForm, event: any) {
    event.preventDefault();
    i.setState({ loading: true });
    let cForm = i.state.form;
    let auth = myAuth();

    let cv = i.props.community_view;

    if (auth) {
      if (cv) {
        let form: EditCommunity = {
          community_id: cv.community.id,
          title: cForm.title,
          description: cForm.description,
          icon: cForm.icon,
          banner: cForm.banner,
          nsfw: cForm.nsfw,
          posting_restricted_to_mods: cForm.posting_restricted_to_mods,
          discussion_languages: cForm.discussion_languages,
          auth,
        };

        WebSocketService.Instance.send(wsClient.editCommunity(form));
      } else {
        if (cForm.title && cForm.name) {
          let form: CreateCommunity = {
            name: cForm.name,
            title: cForm.title,
            description: cForm.description,
            icon: cForm.icon,
            banner: cForm.banner,
            nsfw: cForm.nsfw,
            posting_restricted_to_mods: cForm.posting_restricted_to_mods,
            discussion_languages: cForm.discussion_languages,
            auth,
          };
          WebSocketService.Instance.send(wsClient.createCommunity(form));
        }
      }
    }
    i.setState(i.state);
  }

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

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

  handleCommunityDescriptionChange(val: string) {
    this.setState(s => ((s.form.description = val), s));
  }

  handleCommunityNsfwChange(i: CommunityForm, event: any) {
    i.state.form.nsfw = event.target.checked;
    i.setState(i.state);
  }

  handleCommunityPostingRestrictedToMods(i: CommunityForm, event: any) {
    i.state.form.posting_restricted_to_mods = event.target.checked;
    i.setState(i.state);
  }

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

  handleIconUpload(url: string) {
    this.setState(s => ((s.form.icon = url), s));
  }

  handleIconRemove() {
    this.setState(s => ((s.form.icon = ""), s));
  }

  handleBannerUpload(url: string) {
    this.setState(s => ((s.form.banner = url), s));
  }

  handleBannerRemove() {
    this.setState(s => ((s.form.banner = ""), s));
  }

  handleDiscussionLanguageChange(val: number[]) {
    this.setState(s => ((s.form.discussion_languages = val), s));
  }

  parseMessage(msg: any) {
    let op = wsUserOp(msg);
    console.log(msg);
    if (msg.error) {
      // Errors handled by top level pages
      // toast(i18n.t(msg.error), "danger");
      this.setState({ loading: false });
      return;
    } else if (op == UserOperation.CreateCommunity) {
      let data = wsJsonToRes<CommunityResponse>(msg);
      this.props.onCreate?.(data.community_view);

      // Update myUserInfo
      let community = data.community_view.community;

      let mui = UserService.Instance.myUserInfo;
      if (mui) {
        let person = mui.local_user_view.person;
        mui.follows.push({
          community,
          follower: person,
        });
        mui.moderates.push({
          community,
          moderator: person,
        });
      }
    } else if (op == UserOperation.EditCommunity) {
      let data = wsJsonToRes<CommunityResponse>(msg);
      this.setState({ loading: false });
      this.props.onEdit?.(data.community_view);
      let community = data.community_view.community;

      let mui = UserService.Instance.myUserInfo;
      if (mui) {
        let followFound = mui.follows.findIndex(
          f => f.community.id == community.id
        );
        if (followFound) {
          mui.follows[followFound].community = community;
        }

        let moderatesFound = mui.moderates.findIndex(
          f => f.community.id == community.id
        );
        if (moderatesFound) {
          mui.moderates[moderatesFound].community = community;
        }
      }
    }
  }
}