import type { Client } from "https://deno.land/x/postgres@v0.19.3/mod.ts";
import type { VideoSnapshotType } from "./schema.d.ts";

export async function getVideoSnapshots(
	client: Client,
	aid: number,
	limit: number,
	pageOrOffset: number,
	reverse: boolean,
	mode: "page" | "offset" = "page",
) {
	const offset = mode === "page" ? (pageOrOffset - 1) * limit : pageOrOffset;
	const queryDesc: string = `
        SELECT *
        FROM video_snapshot
        WHERE aid = $1
        ORDER BY created_at DESC
        LIMIT $2
        OFFSET $3
    `;
	const queryAsc: string = `
        SELECT *
        FROM video_snapshot
        WHERE aid = $1
        ORDER BY created_at
        LIMIT $2 OFFSET $3
    `;
	const query = reverse ? queryAsc : queryDesc;
	const queryResult = await client.queryObject<VideoSnapshotType>(query, [aid, limit, offset]);
	return queryResult.rows;
}

export async function getVideoSnapshotsByBV(
	client: Client,
	bv: string,
	limit: number,
	pageOrOffset: number,
	reverse: boolean,
	mode: "page" | "offset" = "page",
) {
	const offset = mode === "page" ? (pageOrOffset - 1) * limit : pageOrOffset;
	const queryAsc = `
        SELECT vs.*
        FROM video_snapshot vs
        JOIN bilibili_metadata bm ON vs.aid = bm.aid
        WHERE bm.bvid = $1
        ORDER BY vs.created_at
        LIMIT $2
        OFFSET $3
    `;
	const queryDesc: string = `
        SELECT *
        FROM video_snapshot vs
        JOIN bilibili_metadata bm ON vs.aid = bm.aid
        WHERE bm.bvid = $1
        ORDER BY vs.created_at DESC
        LIMIT $2 OFFSET $3
    `;
	const query = reverse ? queryAsc : queryDesc;
	const queryResult = await client.queryObject<VideoSnapshotType>(query, [bv, limit, offset]);
	return queryResult.rows;
}