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{%
	let mocklib = global.mocklib;

	return {
		connect: function() {
			let self = this;

			return {
				call: (object, method, args) => {
					let signature = [ object + "~" + method ];

					if (type(args) == "object") {
						for (let i, k in sort(keys(args))) {
							switch (type(args[k])) {
							case "string":
							case "double":
							case "bool":
							case "int":
								push(signature, k + "-" + replace(args[k], /[^A-Za-z0-9_-]+/g, "_"));
								break;

							default:
								push(signature, type(args[k]));
							}
						}
					}

					let candidates = [];

					for (let i = length(signature); i > 0; i--) {
						let path = sprintf("ubus/%s.json", join("~", signature)),
						    mock = mocklib.read_json_file(path);

						if (mock != mock) {
							self._error = "Invalid argument";

							return null;
						}
						else if (mock) {
							mocklib.trace_call("ctx", "call", { object, method, args });

							return mock;
						}

						push(candidates, path);
						pop(signature);
					}

					mocklib.I("No response fixture defined for ubus call %s/%s with arguments %s.", object, method, args);
					mocklib.I("Provide a mock response through one of the following JSON files:\n%s\n", join("\n", candidates));

					self._error = "Method not found";

					return null;
				},

				disconnect: () => null,

				error: () => self.error()
			};
		},

		error: function() {
			let e = this._error;
			delete this._error;

			return e;
		}
	};