/* The Artificer was built in memory of Babka
 * With love, Ean
 *
 * December 21, 2020
 */

import {
	// Discordeno deps
	cache,
	cacheHandlers,
	// imagescript dep
	is,
	// Log4Deno deps
	log,
	LT,
} from '../deps.ts';
import { PastCommandCount } from './mod.d.ts';
import { dbClient, weekDays } from './db.ts';
import utils from './utils.ts';
import config from '../config.ts';

// getRandomStatus() returns status as string
// Gets a new random status for the bot
const getRandomStatus = async (): Promise<string> => {
	let status = '';
	switch (Math.floor((Math.random() * 4) + 1)) {
		case 1:
			status = `${config.prefix}help for commands`;
			break;
		case 2:
			status = `Running V${config.version}`;
			break;
		case 3:
			status = `${config.prefix}info to learn more`;
			break;
		default: {
			const cachedCount = await cacheHandlers.size('guilds');
			status = `Rolling dice for ${cachedCount + cache.dispatchedGuildIds.size} servers`;
			break;
		}
	}

	return status;
};

// updateListStatistics(bot ID, current guild count) returns nothing, posts to botlists
// Sends the current server count to all bot list sites we are listed on
const updateListStatistics = (botID: bigint, serverCount: number): void => {
	config.botLists.forEach(async (e) => {
		log(LT.LOG, `Updating statistics for ${JSON.stringify(e)}`);
		if (e.enabled) {
			const tempHeaders = new Headers();
			tempHeaders.append(e.headers[0].header, e.headers[0].value);
			tempHeaders.append('Content-Type', 'application/json');
			// ?{} is a template used in config, just need to replace it with the real value
			const response = await fetch(e.apiUrl.replace('?{bot_id}', botID.toString()), {
				'method': 'POST',
				'headers': tempHeaders,
				'body': JSON.stringify(e.body).replace('"?{server_count}"', serverCount.toString()), // ?{server_count} needs the "" removed from around it aswell to make sure its sent as a number
			});
			log(LT.INFO, `Posted server count to ${e.name}.  Results: ${JSON.stringify(response)}`);
		}
	});
};

// Keep one week of data
const hoursToKeep = 7 * 24;
const previousHours: Array<Array<PastCommandCount>> = [];
// updateHourlyRates() returns nothing, updates DB directly
// Updates the hourlyRate for command usage
const updateHourlyRates = async () => {
	try {
		const newestHour = await dbClient.query('SELECT command, count FROM command_cnt ORDER BY command;').catch((e) => utils.commonLoggers.dbError('intervals.ts:71', 'query', e));
		previousHours.push(newestHour);
		if (previousHours.length > 1) {
			const oldestHour = previousHours[0];

			const computedDiff: Array<PastCommandCount> = [];
			for (let i = 0; i < newestHour.length; i++) {
				computedDiff.push({
					command: newestHour[i].command,
					count: (newestHour[i].count - oldestHour[i].count),
				});
				log(LT.LOG, `Updating hourlyRate | Computing diffs: ${JSON.stringify(computedDiff)}`);
			}

			// Update DB
			computedDiff.forEach(async (cmd) => {
				log(LT.LOG, `Updating hourlyRate | Storing to DB: ${JSON.stringify(cmd)}`);
				await dbClient.execute(`UPDATE command_cnt SET hourlyRate = ? WHERE command = ?`, [cmd.count / previousHours.length, cmd.command]).catch((e) =>
					utils.commonLoggers.dbError('intervals.ts:88', 'update', e)
				);
			});
		}

		if (previousHours.length > hoursToKeep) {
			previousHours.unshift();
		}
	} catch (e) {
		log(LT.ERROR, `Something went wrong in previousHours interval | Error: ${e.name} - ${e.message}`);
	}
};

// getPercentOfRange(min, max, val) returns number
// Gets a percent value of where val lies in the min-max range
const getPercentOfRange = (minVal: number, maxVal: number, val: number): number => {
	const localMax = maxVal - minVal;
	const localVal = val - minVal;

	return localVal / localMax;
};

// Pixel locations in heatmap-base.png, pixel locations are 0 based
// dayPixels holds the left and right (AKA X Coord) pixel locations for each col (ex: [leftPX, rightPX])
const dayPixels: Array<Array<number>> = [
	[72, 159],
	[163, 260],
	[264, 359],
	[363, 497],
	[501, 608],
	[612, 686],
	[690, 800],
];
// hourPixels holds the top and bottom (AKA Y Coord) pixel locations for each row (ex: [topPX, botPX])
const hourPixels: Array<Array<number>> = [
	[29, 49],
	[51, 72],
	[74, 95],
	[97, 118],
	[120, 141],
	[143, 164],
	[166, 187],
	[189, 209],
	[211, 232],
	[234, 254],
	[256, 277],
	[279, 299],
	[301, 322],
	[324, 345],
	[347, 368],
	[370, 391],
	[393, 413],
	[415, 436],
	[438, 459],
	[461, 482],
	[484, 505],
	[507, 528],
	[530, 550],
	[552, 572],
];
// updateHeatmap() returns nothing, creates new heatmap.png
// Updates the heatmap image with latest data from the db
const updateHeatmapPng = async () => {
	const baseHeatmap = Deno.readFileSync('./src/endpoints/gets/heatmap-base.png');
	const heatmap = await is.decode(baseHeatmap);
	if (heatmap instanceof is.Image) {
		// Get latest data from DB
		const heatmapData = await dbClient.query('SELECT * FROM roll_time_heatmap ORDER BY hour;').catch((e) => utils.commonLoggers.dbError('intervals.ts:148', 'query', e));

		let minRollCnt = Infinity;
		let maxRollCnt = 0;
		// determine min and max values
		for (const hour of heatmapData) {
			for (const day of weekDays) {
				const rollCnt = hour[day];
				log(LT.LOG, `updateHeatmapPng | finding min/max | min: ${minRollCnt} max: ${maxRollCnt} curr: ${rollCnt}`);
				if (rollCnt > maxRollCnt) {
					maxRollCnt = rollCnt;
				}
				if (rollCnt < minRollCnt) {
					minRollCnt = rollCnt;
				}
			}
		}

		// Apply values to image
		for (let hour = 0; hour < heatmapData.length; hour++) {
			for (let day = 0; day < weekDays.length; day++) {
				log(LT.LOG, `updateHeatmapPng | putting ${weekDays[day]} ${hour}:00 into image`);
				const percent = getPercentOfRange(minRollCnt, maxRollCnt, heatmapData[hour][weekDays[day]]);
				heatmap.drawBox(
					dayPixels[day][0] + 1,
					hourPixels[hour][0] + 1,
					dayPixels[day][1] - dayPixels[day][0] + 1,
					hourPixels[hour][1] - hourPixels[hour][0] + 1,
					is.Image.rgbToColor(
						255 * (1 - percent),
						255 * percent,
						0,
					),
				);
			}
		}

		Deno.writeFileSync('./src/endpoints/gets/heatmap.png', await heatmap.encode());
	}
};

export default {
	getRandomStatus,
	updateListStatistics,
	updateHourlyRates,
	updateHeatmapPng,
};