import { isLightColor, rgbaToHex, toRgba } from "@/functions/color";
import mimetypesJSON from "@/assets/mimetypes.json";
import type { Mimetypes } from "@/types/mimetypes";
import { namedColors } from "@/constants/colors";
import * as FileSystem from "expo-file-system";
import ms from "enhanced-ms";
import bytes from "bytes";

const mimetypes = mimetypesJSON as Mimetypes;

export function guessMimetype(
	mimetype: keyof Mimetypes,
): Mimetypes[keyof Mimetypes] {
	if (!mimetype) return "so";

	const mime = mimetypes[mimetype];
	if (!mime) return "so";

	return mime;
}

export function guessExtension(
	mimetype: Mimetypes[keyof Mimetypes],
): keyof Mimetypes {
	if (!mimetype) return "application/octet-stream";

	const mime = Object.entries(mimetypes).find(
		([key, value]) => value === mimetype,
	) as [keyof Mimetypes, Mimetypes[keyof Mimetypes]] | undefined;
	if (!mime) return "application/octet-stream";

	return mime[0];
}

export async function getFileDataURI(filePath: string): Promise<string | null> {
	const base64Data = await FileSystem.readAsStringAsync(filePath, {
		encoding: FileSystem.EncodingType.Base64,
	});

	const extension = filePath.split(".").pop();

	const mimetype = guessExtension(extension as Mimetypes[keyof Mimetypes]);

	const dataURI = `data:${mimetype};base64,${base64Data}`;

	return dataURI;
}

export function timeDifference(currentDate: Date, targetDate: Date) {
	const msPerMinute = 60 * 1000;
	const msPerHour = msPerMinute * 60;
	const msPerDay = msPerHour * 24;
	const msPerMonth = msPerDay * 30;
	const msPerYear = msPerDay * 365;

	const elapsed = targetDate.getTime() - currentDate.getTime();
	const isFuture = elapsed > 0;

	const absElapsed = Math.abs(elapsed);

	if (absElapsed < msPerMinute) {
		const difference = Math.round(absElapsed / 1000);
		return `${isFuture ? "in " : ""}${difference} second${difference !== 1 ? "s" : ""}${isFuture ? "" : " ago"}`;
	}

	if (absElapsed < msPerHour) {
		const difference = Math.round(absElapsed / msPerMinute);
		return `${isFuture ? "in " : ""}${difference} minute${difference !== 1 ? "s" : ""}${isFuture ? "" : " ago"}`;
	}

	if (absElapsed < msPerDay) {
		const difference = Math.round(absElapsed / msPerHour);
		return `${isFuture ? "in " : ""}${difference} hour${difference !== 1 ? "s" : ""}${isFuture ? "" : " ago"}`;
	}

	if (absElapsed < msPerMonth) {
		const difference = Math.round(absElapsed / msPerDay);
		return `${isFuture ? "in " : ""}${difference} day${difference !== 1 ? "s" : ""}${isFuture ? "" : " ago"}`;
	}

	if (absElapsed < msPerYear) {
		const difference = Math.round(absElapsed / msPerMonth);
		return `${isFuture ? "in " : ""}${difference} month${difference !== 1 ? "s" : ""}${isFuture ? "" : " ago"}`;
	}

	const difference = Math.round(absElapsed / msPerYear);
	return `${isFuture ? "in " : ""}${difference} year${difference !== 1 ? "s" : ""}${isFuture ? "" : " ago"}`;
}

export function colorHash(str: string) {
	let hash = 0;
	for (let i = 0; i < str.length; i++) {
		hash = str.charCodeAt(i) + ((hash << 5) - hash);
	}

	let color = "#";
	for (let i = 0; i < 3; i++) {
		const value = (hash >> (i * 8)) & 0xff;
		color += `00${value.toString(16)}`.substr(-2);
	}

	return color;
}

export function convertToBytes(
	value: string | number,
	options?: bytes.BytesOptions,
): string | null {
	if (typeof value === "number") return bytes(value, options);

	if (/^\d+(\.\d+)?$/.test(value)) {
		return bytes(Number.parseFloat(value), options);
	}

	return value;
}

export function convertToTime(
	value: string | number,
	// biome-ignore lint/suspicious/noExplicitAny: enhanced-ms does not export the FormatOptions interface
	options?: any,
): string | null {
	if (typeof value === "number") return ms(value);

	if (/^\d+(\.\d+)?$/.test(value)) {
		return ms(Number.parseFloat(value), options);
	}

	return value;
}

export function getRippleColor(color: string, fraction = 0.4) {
	let hexColor = color;

	if (hexColor in namedColors)
		hexColor = namedColors[hexColor as keyof typeof namedColors];

	if (!hexColor.startsWith("#")) return color;

	const { r, g, b } = toRgba(hexColor);
	const lightColor = isLightColor(hexColor);

	if (lightColor) {
		const newRed = Math.max(0, Math.floor(r * (1 - fraction)));
		const newGreen = Math.max(0, Math.floor(g * (1 - fraction)));
		const newBlue = Math.max(0, Math.floor(b * (1 - fraction)));

		return rgbaToHex(newRed, newGreen, newBlue);
	}

	const newRed = Math.min(255, Math.floor(r + (255 - r) * fraction));
	const newGreen = Math.min(255, Math.floor(g + (255 - g) * fraction));
	const newBlue = Math.min(255, Math.floor(b + (255 - b) * fraction));

	return rgbaToHex(newRed, newGreen, newBlue);
}
export function getMetricsDifference(first: number, last: number): number {
	return Math.round(((first - last) / last) * 100) || 0;
}