import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { action } from "@ember/object";
import didInsert from "@ember/render-modifiers/modifiers/did-insert";
import willDestroy from "@ember/render-modifiers/modifiers/will-destroy";
import { inject as service } from "@ember/service";
import DButton from "discourse/components/d-button";
import { ajax } from "discourse/lib/ajax";
import { popupAjaxError } from "discourse/lib/ajax-error";
import { bind } from "discourse-common/utils/decorators";
import eq from "truth-helpers/helpers/eq";
import not from "truth-helpers/helpers/not";
import AiHelperLoading from "../../components/ai-helper-loading";
import { showPostAIHelper } from "../../lib/show-ai-helper";

export default class AIHelperOptionsMenu extends Component {
  static shouldRender(outletArgs, helper) {
    return showPostAIHelper(outletArgs, helper);
  }
  @service messageBus;
  @tracked helperOptions = [];
  @tracked menuState = this.MENU_STATES.triggers;
  @tracked loading = false;
  @tracked suggestion = "";
  @tracked showMainButtons = true;

  @tracked copyButtonIcon = "copy";
  @tracked copyButtonLabel = "discourse_ai.ai_helper.post_options_menu.copy";

  MENU_STATES = {
    triggers: "TRIGGERS",
    options: "OPTIONS",
    loading: "LOADING",
    result: "RESULT",
  };

  @tracked _activeAIRequest = null;

  constructor() {
    super(...arguments);

    if (this.helperOptions.length === 0) {
      this.loadPrompts();
    }
  }

  @action
  async showAIHelperOptions() {
    this.showMainButtons = false;
    this.menuState = this.MENU_STATES.options;
  }

  @bind
  subscribe() {
    const channel = `/discourse-ai/ai-helper/explain/${this.args.outletArgs.data.quoteState.postId}`;
    this.messageBus.subscribe(channel, this._updateResult);
  }

  @bind
  unsubscribe() {
    this.messageBus.unsubscribe(
      "/discourse-ai/ai-helper/explain/*",
      this._updateResult
    );
  }

  @bind
  _updateResult(result) {
    const suggestion = result.result;

    if (suggestion.length > 0) {
      this.suggestion = suggestion;
    }
  }

  @action
  async performAISuggestion(option) {
    this.menuState = this.MENU_STATES.loading;

    if (option.name === "Explain") {
      this.menuState = this.MENU_STATES.result;

      const fetchUrl = `/discourse-ai/ai-helper/explain`;
      this._activeAIRequest = ajax(fetchUrl, {
        method: "POST",
        data: {
          mode: option.value,
          text: this.args.outletArgs.data.quoteState.buffer,
          post_id: this.args.outletArgs.data.quoteState.postId,
        },
      });
    } else {
      this._activeAIRequest = ajax("/discourse-ai/ai-helper/suggest", {
        method: "POST",
        data: {
          mode: option.value,
          text: this.args.outletArgs.data.quoteState.buffer,
          custom_prompt: "",
        },
      });
    }

    if (option.name !== "Explain") {
      this._activeAIRequest
        .then(({ suggestions }) => {
          this.suggestion = suggestions[0];
        })
        .catch(popupAjaxError)
        .finally(() => {
          this.loading = false;
          this.menuState = this.MENU_STATES.result;
        });
    }

    return this._activeAIRequest;
  }

  @action
  cancelAIAction() {
    if (this._activeAIRequest) {
      this._activeAIRequest.abort();
      this._activeAIRequest = null;
      this.loading = false;
      this.menuState = this.MENU_STATES.options;
    }
  }

  @action
  copySuggestion() {
    if (this.suggestion?.length > 0) {
      navigator.clipboard.writeText(this.suggestion).then(() => {
        this.copyButtonIcon = "check";
        this.copyButtonLabel =
          "discourse_ai.ai_helper.post_options_menu.copied";
        setTimeout(() => {
          this.copyButtonIcon = "copy";
          this.copyButtonLabel =
            "discourse_ai.ai_helper.post_options_menu.copy";
        }, 3500);
      });
    }
  }

  async loadPrompts() {
    let prompts = await ajax("/discourse-ai/ai-helper/prompts");

    this.helperOptions = prompts
      .filter((item) => item.location.includes("post"))
      .map((p) => {
        return {
          name: p.translated_name,
          value: p.id,
          icon: p.icon,
        };
      });
  }

  <template>
    {{#if this.showMainButtons}}
      {{yield}}
    {{/if}}
    <div class="ai-post-helper">
      {{#if (eq this.menuState this.MENU_STATES.triggers)}}
        <DButton
          @class="btn-flat ai-post-helper__trigger"
          @icon="discourse-sparkles"
          @title="discourse_ai.ai_helper.post_options_menu.title"
          @label="discourse_ai.ai_helper.post_options_menu.trigger"
          @action={{this.showAIHelperOptions}}
        />

      {{else if (eq this.menuState this.MENU_STATES.options)}}
        <div class="ai-post-helper__options">
          {{#each this.helperOptions as |option|}}
            <DButton
              @class="btn-flat"
              @icon={{option.icon}}
              @translatedLabel={{option.name}}
              @action={{this.performAISuggestion}}
              @actionParam={{option}}
              data-name={{option.name}}
              data-value={{option.value}}
            />
          {{/each}}
        </div>

      {{else if (eq this.menuState this.MENU_STATES.loading)}}
        <AiHelperLoading @cancel={{this.cancelAIAction}} />
      {{else if (eq this.menuState this.MENU_STATES.result)}}
        <div
          class="ai-post-helper__suggestion"
          {{didInsert this.subscribe}}
          {{willDestroy this.unsubscribe}}
        >
          {{#if this.suggestion}}
            <div class="ai-post-helper__suggestion__text">
              {{this.suggestion}}
            </div>
            <di class="ai-post-helper__suggestion__buttons">
              <DButton
                @class="btn-flat ai-post-helper__suggestion__cancel"
                @icon="times"
                @label="discourse_ai.ai_helper.post_options_menu.cancel"
                @action={{this.cancelAIAction}}
              />
              <DButton
                @class="btn-flat ai-post-helper__suggestion__copy"
                @icon={{this.copyButtonIcon}}
                @label={{this.copyButtonLabel}}
                @action={{this.copySuggestion}}
                @disabled={{not this.suggestion}}
              />
            </di>
          {{else}}
            <AiHelperLoading @cancel={{this.cancelAIAction}} />
          {{/if}}
        </div>
      {{/if}}
    </div>
  </template>
}