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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 {
	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 { 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(
	"yamori-workspace-list",
	class extends YamoriElement {
		static get observedAttributes(): ObservedAttributes {
			return ["pending", "list-response"];
		}

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

		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;
			}
		}

		constructor() {
			super();

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

			const style = document.createElement("style");
			style.textContent = css;
			this.#shadow.appendChild(style);

			this.#startMarker = document.createComment("");
			this.#shadow.appendChild(this.#startMarker);

			this.#endMarker = document.createComment("");
			this.#shadow.appendChild(this.#endMarker);

			this.#render();
		}

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

		#render(): void {
			const range = document.createRange();
			range.setStartAfter(this.#startMarker);
			range.setEndBefore(this.#endMarker);
			range.deleteContents();

			if (!this.#data) {
				// データがない場合はどうしようもないので読込中と同様とする
				const label = document.createElement("p");
				label.textContent = "取得中...";
				this.#shadow.insertBefore(label, this.#endMarker);
				return;
			}

			if (this.#pending) {
				const spinner = document.createElement("div");
				spinner.classList.add("spinner");
				this.#shadow.insertBefore(spinner, this.#endMarker);
			}

			switch (this.#data.result.case) {
				case "systemError": {
					const callout = document.createElement(YamoriCallout.tagName) as InstanceType<
						typeof YamoriCallout.constructor
					>;

					const title = document.createElement("span");
					title.slot = "title";
					title.textContent = `取得エラー (${this.#data.result.value.code})`;
					callout.appendChild(title);

					const message = document.createTextNode(
						`ワークスペース一覧の取得に失敗しました。`,
					);
					callout.appendChild(message);

					const retry = document.createElement(YamoriButton.tagName) as InstanceType<
						typeof YamoriButton.constructor
					>;
					retry.slot = "action";
					retry.textContent = "再試行";
					retry.addEventListener("click", (event) => {
						event.preventDefault();
						event.stopPropagation();

						this.dispatchEvent(new RetryEvent());
					});
					callout.appendChild(retry);

					this.#shadow.insertBefore(callout, this.#endMarker);
					return;
				}
				case "ok": {
					const list = document.createElement("ul");
					list.classList.add("list");
					this.#shadow.insertBefore(list, this.#endMarker);

					const { workspaces } = this.#data.result.value;

					customElements.whenDefined(YamoriWorkspaceListEntry.tagName).then(() => {
						for (const workspace of workspaces) {
							const item = document.createElement(
								YamoriWorkspaceListEntry.tagName,
							) as InstanceType<typeof YamoriWorkspaceListEntry.constructor>;
							item.setWorkspace(workspace);
							list.appendChild(item);
						}
					});

					return;
				}
				default: {
					const message = document.createElement("p");
					message.textContent = "データが破損しています";
					this.#shadow.insertBefore(message, this.#endMarker);
					return;
				}
			}
		}
	},
);