import type { Action, Activity, SocialPost } from "@rss3/api-core";

import { handleMetadata } from "../../metadata/index.js";

export type Content = {
	authorUrl?: string;
	handle?: string;
	address?: string;
	profileId?: string | number | null;
	title?: string;
	body?: string;
	media?: SocialPost["media"];
};

export type PostContent = Content & {
	target?: Content;
};

export function formatContent(activity: Activity) {
	const [action] = activity.actions ?? [];
	return action ? extractContent(activity, action) : undefined;
}

export function extractContent(
	activity: Activity,
	action: Action,
): PostContent | undefined {
	let content: PostContent | undefined;
	handleMetadata(action, {
		"social-post": (metadata) => {
			content = extractSocialPost(activity, action, metadata);
		},
		"social-comment": (metadata) => {
			content = extractSocialPost(activity, action, metadata);
		},
		"social-mint": (metadata) => {
			content = extractSocialPost(activity, action, metadata);
		},
		"social-share": (metadata) => {
			content = extractSocialPost(activity, action, metadata);
		},
		"social-revise": (metadata) => {
			content = extractSocialPost(activity, action, metadata);
		},
		"social-delete": (metadata) => {
			content = extractSocialPost(activity, action, metadata);
		},
	});
	return content;
}

/**
 * The special case for lens post, which will use the first sentence of the body as the title
 */
export function formatTitle(title?: string, body?: string) {
	if (!title) return title;

	const _title = title.replaceAll("…", "");

	return body?.startsWith(_title) ? undefined : _title;
}

export function checkTargetExist(
	target?: Pick<Content, "body" | "media" | "title">,
) {
	if (!target) return false;
	if (!!target.body || !!target.media || !!target.title) return true;
	return false;
}

function extractSocialPost(
	activity: Activity,
	action: Action,
	metadata: SocialPost,
): PostContent {
	const raw = metadata.target;
	const target = raw
		? {
				authorUrl: raw.authorUrl,
				handle: raw.handle,
				address: action.to,
				profileId: raw.profileId,
				title: formatTitle(raw.title, raw.body),
				body: raw.body,
				media: raw.media,
			}
		: undefined;
	// remove the first media, which is the avatar of the author
	// this case only happens in mastodon
	if (target?.media && activity.network?.toLowerCase() === "mastodon") {
		target.media = target.media.slice(1);
	}
	const res = {
		authorUrl: metadata.authorUrl,
		handle: metadata.handle,
		address: action.from,
		profileId: metadata.profileId,
		title: formatTitle(metadata.title, metadata.body),
		body: metadata.body,
		media: metadata.media,
		target: target,
	};
	// the same as the target
	if (res.media && activity.network?.toLowerCase() === "mastodon") {
		res.media = res.media.slice(1);
	}
	return res;
}