Implemented base TestResult functionality

lib/TestResult.js

@@ -1,40 +1,101 @@
 'use strict';
 
 class TestResult {
+	id;
+
 	studentId;
+
+	student;
+
 	accountId;
+
+	account;
+
 	testId;
 
-	constructor() {
+	test;
 
+	time;
+
+	#mark;
+
+	#conn;
+
+	#loaded = false;
+
+	constructor(conn, id) {
+		this.#conn = conn;
+
+		const sql = `
+			select
+				testResultId as id,
+				studentId,
+				testId,
+				accountId,
+				mark,
+				time
+			from
+				testResult
+			where
+				testResultId = ?;
+		`;
+
+		return (async () => {
+			const record = await this.#conn.runQuery(sql, [ id ]);
+
+			if (!record.length)
+				throw new Error('No test result found');
+
+			for (const [ k, v ] of Object.entries(record[0]))
+				this[k] = v;
+
+			await this.load();
+
+			return this;
+		})();
 	}
 
-	set mark() {
+	#getObject(classFile, id) {
+		return new (require(`./${classFile}`))(this.#conn, id);
+	}
 
+	async load() {
+		if (this.#loaded)
+			return;
+
+		[
+			this.student,
+			this.account,
+			this.test
+		] = await Promise.all([
+			this.#getObject('Student', this.studentId),
+			this.#getObject('Account', this.accountId),
+			this.#getObject('Test', this.testId)
+		]);
+
+		this.#loaded = true;
+	}
+
+	set mark(mark) {
+		//TODO handle saving mark
+		this.#mark = mark;
 	}
 
 	get mark() {
-
+		return this.#mark;
 	}
 
 	get percentage() {
-
+		return (
+			parseInt(this.#mark) /
+			parseInt(this.test.template.maxMark) *
+			100
+		);
 	}
 
 	get grade() {
-
+		//TODO get actual grades
-	}
+		return 'C';
-
-	get student() {
-
-	}
-
-	get account() {
-
-	}
-
-	get test {
-
 	}
 }