"use strict";

const Promise = require("bluebird");

const {createDataObject, LocalProperties, ID, Dynamic} = require("../../packages/graphql-interface/data-object");
const upperSnakeCase = require("../../packages/upper-snake-case");
const treecutter = require("../../packages/treecutter");
const deviceNameFromPath = require("../../util/device-name-from-path");

/* TO IMPLEMENT:
- resolveProperty
- resolveProperties
- resolveDataSource
- Dynamic
*/

module.exports = function (types) {
	return function Drive({ path }) {
		return createDataObject({
			[LocalProperties]: {
				path: path,
				/* FIXME: allBlockDevices, for representing every single block device that's hosted on this physical drive, linearly. Need to figure out how that works with representation of mdraid arrays, LVM volumes, etc. */
			},
			[Dynamic]: {
				// FIXME: namespaces
				blockDevice: (_, { resolveProperty }) => {
					return Promise.try(() => {
						return resolveProperty("interface");
					}).then((interface_) => {
						if (interface_ === "nvme") {
							/* NVMe drives do not have a single block device, they have zero or more namespaces */
							return null;
						} else {
							return types.BlockDevice({ path: path });
						}
					});
					
				},
				allBlockDevices: ({ type }, { resolveProperty, resolveDataSource }) => {
					// FIXME: Figure out how to semantically represent that data cannot be stored directly onto an NVMe device (only onto a namespace), but *can* be directly stored on a *non-NVMe* device... usually, anyway.

					return Promise.try(() => {
						return resolveProperty("interface");
					}).then((interface_) => {
						if (interface_ === "nvme") {
							// Dynamic data source lookup: nvme list-ns -> Drive 
							return Promise.try(() => {
								return resolveDataSource("nvmeListNamespaces", path);
							}).map((namespaceId) => {
								return `${path}n${namespaceId}`;
							});
						} else {
							return [ path ];
						}
					}).map((rootPath) => {
						return resolveDataSource("lsblk", { path: rootPath });
					}).then((blockDeviceTrees) => {
						let blockDevices = treecutter.flatten(blockDeviceTrees)
							.map((device) => types.BlockDevice(device));
						// MARKER: Find a way to reassemble this tree on the client side, for display
						// MARKER: Why are most of the mounts (erroneously) empty?

						if (type != null) {
							return Promise.filter(blockDevices, (device) => {
								return Promise.try(() => {
									return resolveProperty("type", device.item);
								}).then((deviceType) => {
									return (deviceType === type);
								});
							});
						} else {
							return blockDevices;
						}
					});
				}
			},
			lsblk: {
				[ID]: { path },
				// TODO: Implement [DependsOn], for cases where a source data mapper depends on data from more than one source, so it can reference properties defined elsewhere?
				// FIXME: Figure out a nice way to make a source lookup conditional upon something else (like only do a `lsblk` if not an NVMe drive, and for NVMe drives return a hardcoded thing)
				// allBlockDevices: function (rootDevice, { type }, context) {
				// 	let devices = treecutter.flatten([rootDevice])
				// 		.map((device) => types.BlockDevice({ name: device.name }));

				// 	if (type != null) {
				// 		return Promise.filter(devices, (device) => {
				// 			return Promise.try(() => {
				// 				return device.type({}, context);
				// 			}).then((deviceType) => {
				// 				return (deviceType === type);
				// 			});
				// 		});
				// 	} else {
				// 		return devices;
				// 	}
				// }
			},
			smartctlScan: {
				[ID]: path,
				interface: "interface"
			},
			smartctlInfo: {
				[ID]: path,
				model: "model",
				modelFamily: "modelFamily",
				smartAvailable: "smartAvailable",
				smartEnabled: "smartEnabled",
				serialNumber: "serialNumber",
				wwn: "wwn",
				firmwareVersion: "firmwareVersion",
				size: "size",
				rpm: "rpm",
				logicalSectorSize: (device) => device.sectorSizes.logical,
				physicalSectorSize: (device) => device.sectorSizes.physical,
				formFactor: "formFactor",
				ataVersion: "ataVersion",
				sataVersion: "sataVersion"
			},
			smartctlAttributes: {
				[ID]: path,
				smartAttributes: (attributes) => {
					return attributes.map((attribute) => {
						return Object.assign({}, attribute, {
							type: upperSnakeCase(attribute.type),
							updatedWhen: upperSnakeCase(attribute.updatedWhen)
						});
					});
				},
				smartHealth: (attributes) => {
					let failed = attributes.filter((item) => {
						return (item.failingNow === true || item.failedBefore === true);
					});
				
					let deteriorating = attributes.filter((item) => {
						return (item.type === "preFail" && item.worstValueSeen < 100);
					});
				
					if (failed.length > 0) {
						return "FAILING";
					} else if (deteriorating.length > 0) {
						return "DETERIORATING";
					} else {
						return "HEALTHY";
					}
				}
			}
		});
	};
};