import Nostrich from "nostrich.jpg";

import { TaggedRawEvent } from "Nostr";
import EventKind from "Nostr/EventKind";
import type { NotificationRequest } from "State/Login";
import { MetadataCache } from "State/Users";
import { getDb } from "State/Users/Db";
import { getDisplayName } from "Element/ProfileImage";
import { MentionRegex } from "Const";

export async function makeNotification(ev: TaggedRawEvent): Promise<NotificationRequest | null> {
    const db = getDb()
    switch (ev.kind) {
        case EventKind.TextNote: {
            const pubkeys = new Set([ev.pubkey, ...ev.tags.filter(a => a[0] === "p").map(a => a[1]!)]);
            const users = await db.bulkGet(Array.from(pubkeys))
            const fromUser = users.find(a => a?.pubkey === ev.pubkey);
            const name = getDisplayName(fromUser, ev.pubkey);
            const avatarUrl = (fromUser?.picture?.length ?? 0) === 0 ? Nostrich : fromUser?.picture;
            return {
                title: `Reply from ${name}`,
                body: replaceTagsWithUser(ev, users).substring(0, 50),
                icon: avatarUrl,
                timestamp: ev.created_at * 1000,
            }
        }
    }
    return null;
}

function replaceTagsWithUser(ev: TaggedRawEvent, users: MetadataCache[]) {
    return ev.content.split(MentionRegex).map(match => {
        let matchTag = match.match(/#\[(\d+)\]/);
        if (matchTag && matchTag.length === 2) {
            let idx = parseInt(matchTag[1]);
            let ref = ev.tags[idx];
            if (ref && ref[0] === "p" && ref.length > 1) {
                let u = users.find(a => a.pubkey === ref[1]);
                return `@${getDisplayName(u, ref[1])}`;
            }
        }
        return match;
    }).join();
}