"use strict";

const assert = require("assert");
const timeCall = require("time-call");

const encodeField = require("./encode-field");
const coders = require("./coders");

// TODO: Test if codegen can speed this up, though note that dynamically-created functions execute in global scope *only*
// TODO: Enum
// FIXME: Default field values
// FIXME:regex type

module.exports = function createRecordObjectCoder(schema) {
	return {
		encode: function (object) {
			let auxiliaryBlobs = new Map();

			let buffers = schema.flatMap(({ name, type: fieldType, required, attributes }) => {
				// options = { precision, withTimezone, signed, ... }
				let value = object[name];
				let result = encodeField({ asIndexKey: false, name, value, fieldType, required, ... attributes });

				if (result.auxiliaryBlob !== undefined) {
					auxiliaryBlobs.set(result.auxiliaryBlob.key, result.auxiliaryBlob.value);
				}

				return result.value;
			});

			return {
				record: Buffer.concat(buffers),
				auxiliaryBlobs: auxiliaryBlobs
			};
		},
		decode: function (buffer) {
			let offset = 0;
			let resultObject = {};
			
			schema.forEach(({ name, type: fieldType, attributes }) => {
				let result = coders.decode(fieldType, buffer, offset, attributes);

				if (result.auxiliaryBlob === undefined) {
					resultObject[name] = result.value;
				} else {
					// FIXME
					resultObject[name] = { _blobKey: result.auxiliaryBlob.key };
				}

				offset += result.bytesRead;
			});

			// Ensure that we've read exactly enough bytes
			assert(offset === buffer.length);

			return resultObject;
		}
	};
};

// let dummySchema = [
// 	{ name: "username", type: "string", required: true },
// 	{ name: "passwordHash", type: "string", required: true },
// 	{ name: "emailAddress", type: "string" },
// 	{ name: "isActive", type: "boolean", required: true },
// 	{ name: "registrationDate", type: "date", required: true, attributes: { withTimezone: true } },
// 	{ name: "invitesLeft", type: "integer", required: true },
// ];

// let recordCoder = module.exports(dummySchema);

// let input = {
// 	username: "joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91joepie91",
// 	passwordHash: "foobar",
// 	emailAddress: "admin@cryto.net",
// 	isActive: true,
// 	registrationDate: new Date,
// 	invitesLeft: 10
// };

// let encoded = recordCoder.encode(input);
// let decoded = recordCoder.decode(encoded.record);

// // 44 bytes encoded
// // 29 characters string
// // 15 bytes extra
// console.log({ input, encoded, decoded });

// // console.log(timeCall(() => {
// // 	for (let i = 0; i < 1000; i++) {
// // 		recordCoder.encode({
// // 			username: "joepie91",
// // 			passwordHash: "foobar",
// // 			emailAddress: "admin@cryto.net",
// // 			isActive: true,
// // 			registrationDate: new Date,
// // 			invitesLeft: 10
// // 		});
// // 	}
// // }));