'use strict';

module.exports = function(socket, options) {
	return Promise.try(() => {
		return Promise.all([
			socket.execute("query-commands"),
			socket.execute("query-block")
		]);
	}).then((commands, blockDevices) => {
		let commandList = commands.map((item) => item.name);

		let supportsBlockdevChangeMedium = commandList.includes("blockdev-change-medium");

		let cdromDevices = blockDevices.filter((devices) => device.device.match(/^ide[0-9]-cd[0-9]$/));

		return {
			create: function() {
				
			},
			getSupportedFeatures: function() {
				return [
					"start", "stop", "forceStop", "forceReset",
					"insertDisk", "ejectDisk", "forceEjectDisk", "inspectDisk",
					"vncPassword"
				];
			},
			getStatus: function() {
				return socket.execute("query-status");
			},
			start: function() {
				// FIXME
			},
			stop: function(force = false) {
				return Promise.try(() => {
					if (force) {
						socket.execute("quit");
					} else {
						socket.execute("system_powerdown");
					}
				});
			},
			reset: function(force = true) {
				return Promise.try(() => {
					if (force) {
						socket.execute("system_reset");
					} else {
						throw new NotImplementedError("ACPI reset is not available for QEMU/KVM");
					}
				});
			},
			suspend: function() {
				return socket.execute("stop");
			},
			unsuspend: function() {
				return socket.execute("cont");
			},
			insertDisk: function(path, options = {}) {
				return Promise.try(() => {
					if (cdromDevices.length === 0) {
						throw new Error("No CD-ROM devices available");
					} else {
						if (supportsBlockdevChangeMedium) {
							return socket.execute("blockdev-change-medium", {
								device: cdromDevices[0].device,
								filename: path,
								format: options.format
							});
						} else {
							if (options.format != null) {
								throw new Error("QEMU/QMP version does not allow for specifying the image format");
							} else {
								return socket.execute("change", {
									device: cdromDevices[0].device,
									target: path
								});
							}
						}
					}
				})
			},
			ejectDisk: function(force = false) {
				return Promise.try(() => {
					if (cdromDevices.length === 0) {
						throw new Error("No CD-ROM devices available");
					} else {
						return socket.execute("eject", {
							device: cdromDevices[0].device
						});
					}
				})
			},
			inspectDisk: function() {
				// FIXME: Normalized format?
				return Promise.try(() => {
					if (cdromDevices.length === 0) {
						throw new Error("No CD-ROM devices available");
					} else {
						return Promise.try(() => {
							return socket.execute("query-block");
						}).then((blockDevices) => {
							return blockDevices.filter((device) => device.device === cdromDevices[0].device);
						});
					}
				});
			}
		}
	});
}