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// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

import { fromJsonString } from "@bufbuild/protobuf";
import { html, nothing, render, type TemplateResult } from "lit-html";
import { repeat } from "lit-html/directives/repeat.js";

import {
	type ListResponse,
	ListResponseSchema,
} from "@yamori/proto/yamori/workspace/v1/list_response_pb.js";

import { wrapElement, YamoriElement } from "../../element.ts";

import { YamoriButton } from "../../components/button/button.ts";
import { YamoriCallout } from "../../components/callout/callout.ts";
import { YamoriEmpty } from "../../components/empty/empty.ts";
import { LucideBadgeX } from "../../lucide/icons.ts";
import { YamoriWorkspaceListEntry } from "../workspace-list-entry/workspace-list-entry.ts";

import css from "./workspace-list.css?inline";

export { OpenEvent } from "../workspace-list-entry/workspace-list-entry.ts";

export class RetryEvent extends Event {
	constructor() {
		super("retry", {
			cancelable: true,
		});
	}
}

type ObservedAttributes = readonly ["pending", "list-response"];

export const YamoriWorkspaceList = wrapElement({
	tagName: "yamori-workspace-list",
	dependencies: [
		YamoriButton,
		YamoriCallout,
		YamoriEmpty,
		LucideBadgeX,
		YamoriWorkspaceListEntry,
	],
	constructor: class extends YamoriElement {
		static get observedAttributes(): ObservedAttributes {
			return ["pending", "list-response"];
		}

		#pending: boolean = this.hasAttribute("pending");
		#data: ListResponse | null = this.#parseListResponseAttribute();
		#shadow: ShadowRoot;

		attributeChangedCallback(
			name: ObservedAttributes[number],
			oldValue: string | null,
			newValue: string | null,
		) {
			if (oldValue === newValue) {
				return;
			}

			switch (name) {
				case "pending":
					this.#pending = typeof newValue === "string";
					this.#render();
					return;
				case "list-response":
					this.#data = this.#parseListResponseAttribute();
					this.#render();
					return;
			}
		}

		#parseListResponseAttribute(): ListResponse | null {
			const value = this.getAttribute("list-response");
			if (!value) {
				return null;
			}

			try {
				return fromJsonString(ListResponseSchema, value);
			} catch (error) {
				console.error(`The value of "list-response" attribute is invalid.`, error);
				return null;
			}
		}

		override connectedCallback(): void {
			super.connectedCallback();

			this.#render();
		}

		constructor() {
			super();

			this.#shadow = this.attachShadow({
				mode: "open",
			});
		}

		setListResponse(listResponse: ListResponse): void {
			this.#data = listResponse;
			this.#render();
		}

		#pendingIndicator(): TemplateResult {
			if (!this.#pending) {
				return html`${nothing}`;
			}

			return html`
				<span class="revalidating">データ取得中...</span>
			`;
		}

		#view(): TemplateResult {
			// データがない場合はどうしようもないので読込中としてお茶を濁す
			if (!this.#data) {
				return html`
					${this.#pendingIndicator()}

					<p>取得中...</p>
				`;
			}

			switch (this.#data.result.case) {
				case "systemError": {
					const onRetry = (event: MouseEvent) => {
						event.preventDefault();
						event.stopPropagation();

						this.dispatchEvent(new RetryEvent());
					};

					return html`
						${this.#pendingIndicator()}

						<yamori-empty>
							<lucide-badge-x slot="icon"></lucide-badge-x>
							<span slot="title">取得エラー</span>

							ワークスペース一覧の取得に失敗しました。<br/>
							エラーコード: ${this.#data.result.value.code}

							<yamori-button slot="action" ?pending=${this.#pending} @click=${onRetry}>
								再取得
							</yamori-button>
						</yamori-empty>
					`;
				}
				case "ok": {
					const { workspaces } = this.#data.result.value;

					if (workspaces.length === 0) {
						return html`
							${this.#pendingIndicator()}

							<slot name="empty-fallback" class="fallback"></slot>
						`;
					}

					return html`
						${this.#pendingIndicator()}

						<ul class="list">
							${repeat(
								workspaces,
								(workspace) => workspace.id?.value,
								(workspace) => html`
									<yamori-workspace-list-entry .workspace=${workspace}></yamori-workspace-list-entry>
								`,
							)}
						</ul>
					`;
				}
				default: {
					return html`<p>データが破損しています</p>`;
				}
			}
		}

		#render(): void {
			render(
				html`
					<style>${css}</style>

					${this.#view()}
				`,
				this.#shadow,
			);
		}
	},
});