/**
 */
class type_output_markdown implements type_output<string>
{
	public readonly kind : string = "markdown";
	public readonly data : {};
	public constructor(data : {}) {this.data = data;}
	
	/**
	 */
	private render_object_internal(
		object : type_object,
		options : {
			depth ?: int;
			headline_level ?: int;
			list_level ?: int;
		} = {}
	) : string
	{
		options = Object.assign(
			{
				"depth": 0,
				"headline_level": 0,
				"list_level": 0,
			},
			options
		);
		return lib_plankton.call.distinguish<string>(
			object,
			{
				"text": ({"content": content}) => lib_plankton.string.coin(
					"{{content}}",
					{
						"content": content,
					}
				),
				"code": ({"content": content}) => lib_plankton.string.coin(
					"`{{content}}`",
					{
						"content": content,
					}
				),
				"link": ({"target": target, "label": label}) => lib_plankton.string.coin(
					"[{{label}}]({{target}})",
					{
						"target": target,
						"label": label,
					}
				),
				"section": ({"title": title, "content": content}) => lib_plankton.string.coin(
					"{{head}}\n\n{{body}}\n\n\n",
					{
						"head": lib_plankton.string.coin(
							"{{prefix}} {{value}}",
							{
								"prefix": "#".repeat(options.level + 1),
								"value": title,
							}
						),
						"body": this.render_object_internal(
							content,
							{
								"depth": (options.depth + 1),
								"headline_level": (options.level + 1),
								"list_level": options.list_level,
							}
						),
					}
				),
				"group": ({"members": members}) => lib_plankton.string.coin(
					"{{members}}",
					{
						"members": (
							members
							.map(
								x => this.render_object_internal(
									x,
									{
										"depth": options.depth,
										"headline_level": options.level,
										"list_level": options.list_level
									}
								)
							)
							.join(
								""
							)
						)
					}
				),
				"list": ({"items": items}) => lib_plankton.string.coin(
					"{{items}}",
					{
						"items": (
							items
							.map(
								item => lib_plankton.string.coin(
									"{{indentation}}- {{content}}",
									{
										"indentation": "  ".repeat(options.list_level),
										"content": this.render_object_internal(
											item,
											{
												"depth": (options.depth + 1),
												"headline_level": options.level,
												"list_level": (options.list_level + 1),
											}
										),
									},
								)
							)
							.join(
								"\n"
							)
						),
					}
				),
				"table": ({"head": head, "rows": rows}) => lib_plankton.string.coin(
					"(unhandled)",
					{
					}
				),
			},
			{
				"fallback": (object) => lib_plankton.string.coin(
					"(unhandled)",
					{
					}
				),
			}
		);
	}
	
	
	/**
	 * @implementation
	 */
	public render_object(
		object : type_object
	) : string
	{
		return this.render_object_internal(object);
	}
	
	
	/**
	 * @implementation
	 */
	public render_document(
		document : type_document
	) : string
	{
		return this.render_object_internal(
			document.content_main,
			{
			}
		);
	}
	
}


/**
 */
output_kind_register(
	"markdown",
	(data, sub) => (
		new type_output_markdown(
			{
			}
		)
	)
);