import { LitElement, html, customElement, TemplateResult, property, CSSResult, css } from "lit-element";
import "./Message";
import { APIMessage } from "./Message";
import PFAlertGroup from "@patternfly/patternfly/components/AlertGroup/alert-group.css";
import PFBase from "@patternfly/patternfly/patternfly-base.css";
import { EVENT_WS_MESSAGE, WS_MSG_TYPE_MESSAGE } from "../../constants";
import { WSMessage } from "../../common/ws";

export function showMessage(message: APIMessage): void {
    const container = document.querySelector<MessageContainer>("ak-message-container");
    if (!container) {
        throw new Error("failed to find message container");
    }
    container.addMessage(message);
    container.requestUpdate();
}

@customElement("ak-message-container")
export class MessageContainer extends LitElement {

    @property({attribute: false})
    messages: APIMessage[] = [];

    static get styles(): CSSResult[] {
        return [PFBase, PFAlertGroup, css`
            /* Fix spacing between messages */
            ak-message {
                display: block;
            }
        `];
    }

    constructor() {
        super();
        this.addEventListener(EVENT_WS_MESSAGE, ((e: CustomEvent<WSMessage>) => {
            if (e.detail.type !== WS_MSG_TYPE_MESSAGE) return;
            this.addMessage(e.detail as unknown as APIMessage);
        }) as EventListener);
    }

    // add a new message, but only if the message isn't currently shown.
    addMessage(message: APIMessage): void {
        const matchingMessages = this.messages.filter(m => m.message == message.message);
        if (matchingMessages.length < 1) {
            this.messages.push(message);
        }
    }

    render(): TemplateResult {
        return html`<ul class="pf-c-alert-group pf-m-toast">
            ${this.messages.map((m) => {
                return html`<ak-message
                    .message=${m}
                    .onRemove=${(m: APIMessage) => {
                        this.messages = this.messages.filter((v) => v !== m);
                        this.requestUpdate();
                    }}>
                    </ak-message>`;
                })}
        </ul>`;
    }
}