import * as twitch from "../twitch";
import { log, LogLevel } from "../logging"
import db from "../db";

export async function processFollows(streamer: twitch.StreamerUserIdTokenPair) {
	var dbconn = await db.connect();
	try {
		await dbconn.query('BEGIN');
		await dbconn.query("DELETE FROM follows");
		// Insert the streamer as a follower
		await dbconn.query({text: "INSERT INTO follows (userid) VALUES ($1)", values: [streamer.userid]})
		var response = await twitch.streamerApiRequest(streamer,
			`/users/follows?to_id=${streamer.userid}&first=100`);
		log(LogLevel.DEBUG,"Follows API response:")
		log(LogLevel.DEBUG,JSON.stringify(response,null,2));
		while (true) {
			var insertFollowQuery = "INSERT INTO follows (userid) VALUES ";
			var followRow = 0; // Used for $1, $2, etc. in parameterized query
			var followsArray: number[] = [];
			if (Object.keys(response.data).length > 0) {
				for (var follow of response.data) {
					followRow++;
					insertFollowQuery += `($${followRow}), `;
					followsArray.push(follow.from_id as number);
				}
				insertFollowQuery = insertFollowQuery.slice(0,-2); // Cut last `, ` off of the end
				var followQueryConfig = {
					text: insertFollowQuery,
					values: followsArray
				};
				log(LogLevel.DEBUG,"followQueryConfig object:")
				log(LogLevel.DEBUG,JSON.stringify(followQueryConfig,null,2))
				await dbconn.query(followQueryConfig);
			}
			if (response.pagination.cursor) {
				response = await twitch.streamerApiRequest(streamer,
					`/users/follows?to_id=${streamer.userid}&after=${response.pagination.cursor}&first=100`);
				log(LogLevel.DEBUG,"Follow API response:");
				log(LogLevel.DEBUG,JSON.stringify(response,null,2));
			} else {
				break;
			}
		}
		await dbconn.query("CALL update_scores()");
		await dbconn.query('COMMIT');
	} catch (e) {
		log(LogLevel.ERROR,"cronjobs.processFollows: Exception thrown; rolling back");
		await dbconn.query('ROLLBACK');
		throw(e);
	} finally {
		await dbconn.release();
	}
}