namespace _zeitbild.service.caldav
{
	
	/**
	 * @todo use pod for output
	 * @todo get api paths in props from config
	 * @todo consider to outsorce to plankton
	 */
	export function probe(
		input : (null | lib_plankton.xml.type_node_data),
		{
			"force_props": force_props = null,
		} : {
			force_props ?: (null | Array<string>);
		} = {
		}
	) : (null | lib_plankton.xml.type_node_data)
	{
		const http_protocol : string = "HTTP/1.1";
		let props : (null | Array<string>);
		if (force_props) {
			props = force_props;
		}
		else {
			if (
				(input !== null)
				&&
				(input.kind === "complex")
				&&
				(
					(input.data.tag.toLowerCase() === "d:propfind")
					||
					(input.data.tag.toLowerCase() === "propfind")
				)
				&&
				(input.data.children.length === 1)
				&&
				(input.data.children[0].kind === "complex")
				&&
				(
					(input.data.children[0].data.tag.toLowerCase() === "d:prop")
					||
					(input.data.children[0].data.tag.toLowerCase() === "prop")
				)
			) {
				props = input.data.children[0].data.children.map(
					node => {
						switch (node.kind) {
							case "complex": {
								return node.data.tag;
								break;
							}
							default: {
								throw (new Error("unexpected node type for prop"));
								break;
							}
						}
					}
				);
				props.sort();
			}
			else {
				props = null;
			}
		}
		if (props === null) {
			lib_plankton.log.notice(
				"service.caldav.probe.unexpected_input",
				{
					"input": input,
				}
			);
			return null;
		}
		else {
			const answers : Record<
				string,
				lib_plankton.webdav.type_data_prop_value
			> = {
				// webdav 1
				
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc2518#section-13.2
				 */
				"displayname": {
					"kind": "primitive",
					"data": "projects"
				},
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc2518#section-13.4
				 */
				/*
				"getcontentlength": {
					"kind": "none",
					"data": null
				},
				 */
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc2518#section-13.5
				 */
				/*
				"getcontenttype": {
					"kind": "none",
					"data": null
				},
				 */
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc2518#section-13.7
				 */
				/*
				"getlastmodified": {
					"kind": "none",
					"data": null
				},
				 */
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc2518#section-13.9
				 */
				"resourcetype": {
					"kind": "resourcetype",
					"data": {
						"kind": "collection",
						"type": "calendar",
					}
				},
				
				// webdav 2
				
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc3744#section-4.2
				 */
				"principal-url": {
					"kind": "href",
					"data": "/caldav"
				},
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc3744#section-5.1
				 */
				"owner": {
					"kind": "primitive",
					"data": ""
				},
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc3744#section-5.4
				 */
				"current-user-privilege-set": {
					"kind": "privileges",
					"data": [
						"read"
					]
				},
				
				// caldav
				
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc4791#section-6.2.1
				 */
				"calendar-home-set": {
					"kind": "href",
					"data": "/caldav/project"
				},
				
				// WebDAV Current Principal Extension
				
				/**
				 * @see https://datatracker.ietf.org/doc/html/rfc5397#section-3
				 */
				"current-user-principal": {
					"kind": "href",
					"data": "/caldav"
				},

				// unknown
				
				/*
				"calendar-color": {
					"kind": "none",
					"data": null
				},
				"executable": {
					"kind": "none",
					"data": null
				},
				"checked-in": {
					"kind": "none",
					"data": null
				},
				"checked-out": {
					"kind": "none",
					"data": null
				},
				"calendar-user-address-set": {
					"kind": "none",
					"data": null
				},
				 */
			};
			return {
				"kind": "root",
				"data": {
					"version": "1.0",
					"encoding": "utf-8",
					"content": lib_plankton.webdav.data_multistatus_encode_xml(
						{
							"responses": [
								{
									"href": "/caldav/project",
									"body": {
										/**
										 * @todo maybe propstats needs to be filled with props (.map …)
										 */
										"propstats": (
											false
											?
											[
												{
													"prop": (props ?? []).map(
														(prop) => {
															const prop_parts : Array<string> = prop.toLowerCase().split(":");
															const prop_normalized : string = ((prop_parts.length <= 1) ? prop_parts[0] : prop_parts.slice(1).join(":"));
															if (! (prop_normalized in answers)) {
																lib_plankton.log.error(
																	"api.caldav_probe.unhandled_prop",
																	prop_normalized
																);
																throw (new Error("unhandled prop: " + prop_normalized));
															}
															else {
																return {
																	"name": prop,
																	"value": (
																		answers[prop_normalized]
																		??
																		{
																			"kind": "none",
																			"data": null,
																		}
																	),
																};
															}
														}
													),
													"status": (http_protocol + " 200 OK"),
													"description": null,
												},
											]
											:
											props.map(
												(prop) => {
													const prop_parts : Array<string> = prop.toLowerCase().split(":");
													const prop_normalized : string = (
														(prop_parts.length <= 1)
														?
														prop_parts[0]
														:
														prop_parts.slice(1).join(":")
													);
													if (! (prop_normalized in answers)) {
														lib_plankton.log.notice(
															"api.caldav_probe.unhandled_prop",
															prop_normalized
														);
														/*
														throw (new Error("unhandled prop: " + prop_normalized));
														 */
														return {
															"prop": [
																{
																	"name": prop,
																	"value": {
																		"kind": "none",
																		"data": null,
																	}
																},
															],
															"status": (http_protocol + " 404 Not Found"),
															"description": null,
														};
													}
													else {
														return {
															"prop": [
																{
																	"name": prop,
																	"value": answers[prop_normalized],
																},
															],
															"status": (http_protocol + " 200 OK"),
															"description": null,
														};
													};
												}
											)
										)
									},
									"description": null,
								}
							],
							"description": null,
						}
					)
				}
			};
		}
	}
	
	
	/**
	 */
	export function projects(
		user_id : type_user_id
	) : Promise<lib_plankton.xml.type_node_data>
	{
		return (
			_zeitbild.service.calendar.overview(user_id)
			.then(
				(data_raw) => Promise.resolve(
					data_raw
					.map(
						(entry) => ({
							"id": entry.id,
							"name": entry.name,
							"access_level": _zeitbild.value_object.access_level.to_string(entry.access_level),
						})
					)
				)
			)
			.then(
				(data) => Promise.resolve(
					{
						"kind": "root",
						"data": {
							"version": "1.0",
							"encoding": "utf-8",
							"content": lib_plankton.webdav.data_multistatus_encode_xml(
								{
									"responses": data.map(
										(entry) => ({
											"href": lib_plankton.string.coin(
												"/caldav/project/{{id}}",
												{
													"id": entry.id.toFixed(0),
												}
											),
											"body": {
												"propstats": [
													{
														"prop": [
															{
																"name": "D:displayname",
																"value": {
																	"kind": "primitive",
																	"data": entry.name,
																},
															},
															{
																"name": "D:resourcetype",
																"value": {
																	"kind": "resourcetype",
																	"data": {
																		"kind": "collection",
																		"type": "calendar",
																	}
																}
															},
														],
														"status": "HTTP/1.1 200 OK",
														"description": null,
													}
												],
											},
											"description": null,
										})
									),
									"description": null,
								}
							)
						}
					}
				)
			)
		);
	}
	
}