package funkin.util;

import haxe.Json;
import thx.semver.Version;

class SerializerUtil
{
	static final INDENT_CHAR = "\t";

	/**
	 * Convert a Haxe object to a JSON string.
	**/
	public static function toJSON(input:Dynamic, ?pretty:Bool = true):String
	{
		return Json.stringify(input, replacer, pretty ? INDENT_CHAR : null);
	}

	/**
	 * Convert a JSON string to a Haxe object of the chosen type.		
	 */
	public static function fromJSONTyped<T>(input:String, type:Class<T>):T
	{
		return cast Json.parse(input);
	}

	/**
	 * Convert a JSON string to a Haxe object.
	 */
	public static function fromJSON(input:String):Dynamic
	{
		return Json.parse(input);
	}

	/**
	 * Customize how certain types are serialized when converting to JSON.
	 */
	static function replacer(key:String, value:Dynamic):Dynamic
	{
		// Hacky because you can't use `isOfType` on a struct.
		if (key == "version")
		{
			if (Std.isOfType(value, String))
				return value;

			// Stringify Version objects.
			var valueVersion:thx.semver.Version = cast value;
			var result = '${valueVersion.major}.${valueVersion.minor}.${valueVersion.patch}';
			if (valueVersion.hasPre)
				result += '-${valueVersion.pre}';
			if (valueVersion.hasBuild)
				result += '+${valueVersion.build}';
			return result;
		}

		// Else, return the value as-is.
		return value;
	}
}