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

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

import base from "../../vars/base.css?inline";
import dark from "../../vars/dark.css?inline";
import contrast from "../../vars/contrast.css?inline";
import darkContrast from "../../vars/dark-contrast.css?inline";

// NOTE: Safari (おそらく WebKit) はバグによってスタイルの `media` 属性が反映されない。
//       開発者ツールで属性値にスペースを足すなどして手動で編集すれば反映されるが、
//       JS で変更した値は `<style>` `<link>` 共に無視される。
//       <https://bugs.webkit.org/show_bug.cgi?id=26179>
//       上記バグレポートのアタッチメントは Safari 18.2 で確認したところ解決している。
//       CustomElement 固有か Shadow DOM 固有かはわからないが根本解決はされていないため
//       Safari 上でテーマ固定・マトリクスを使った確認はできない。
export const DocsThemeOverride = wrapElement({
	tagName: "docs-theme-override",
	constructor: class DocsThemeOverride extends YamoriElement {
		static get observedAttributes() {
			return ["color-scheme", "contrast"] as const;
		}

		#contrast: "more" | "no-preference" | null = null;
		#colorScheme: "dark" | "light" | null = null;

		#darkStyle: HTMLStyleElement;
		#contrastStyle: HTMLStyleElement;
		#darkContrastStyle: HTMLStyleElement;

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

			switch (name) {
				case "color-scheme":
					this.setColorScheme(newValue);
					return;
				case "contrast":
					this.setContrast(newValue);
					return;
			}
		}

		setContrast(value: string | null): void {
			switch (value) {
				case null:
				case "more":
				case "no-preference":
					this.#contrast = value;
					this.updateMediaQueries();
					return;
				default:
					console.warn(
						`Invalid contrast override "${value}". Accepted values are: "more", "no-preference" and null`,
					);
					return;
			}
		}

		setColorScheme(value: string | null): void {
			switch (value) {
				case null:
				case "dark":
				case "light":
					this.#colorScheme = value;
					this.updateMediaQueries();
					return;
				default:
					console.warn(
						`Invalid color-scheme override "${value}". Accepted values are: "dark", "light" and null`,
					);
					return;
			}
		}

		updateMediaQueries(): void {
			const dark =
				this.#colorScheme === null
					? "(prefers-color-scheme: dark)"
					: this.#colorScheme === "dark"
						? "all"
						: "not all";

			const contrast =
				this.#contrast === null
					? "(prefers-contrast: more)"
					: this.#contrast === "more"
						? "all"
						: "not all";

			this.#darkStyle.media = dark;

			this.#contrastStyle.media = contrast;

			this.#darkContrastStyle.media =
				dark === contrast ? dark : `${dark} and ${contrast}`;
		}

		constructor() {
			super();

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

			const baseStyle = document.createElement("style");
			baseStyle.textContent = base;
			shadow.appendChild(baseStyle);

			this.#darkStyle = document.createElement("style");
			this.#darkStyle.textContent = dark;
			shadow.appendChild(this.#darkStyle);

			this.#contrastStyle = document.createElement("style");
			this.#contrastStyle.textContent = contrast;
			shadow.appendChild(this.#contrastStyle);

			this.#darkContrastStyle = document.createElement("style");
			this.#darkContrastStyle.textContent = darkContrast;
			shadow.appendChild(this.#darkContrastStyle);

			this.updateMediaQueries();

			const slot = document.createElement("slot");
			shadow.appendChild(slot);
		}
	},
});