import { LoadInput } from "../common.ts";

/**
 * Calculate the sum of all calibration values in a document
 *
 * @param {string[]} document All lines of a document containing calibration values
 * @returns {number} The sum of all calibration values found in a document
 */
function CalculateCalibrationSum(document: string[]): number {
	return document.reduce((register, currVal) => register + extractCalibrationValue(currVal), 0);
}

/**
 * Extract a calibration value from a line of text
 *
 * Extracts the first and last digit from a string of text,
 * concatenates the two, and returns this as the calibration value.
 *
 * If only one digit is present, the one digit is concatenated to
 * itself.
 *
 * @param {string} line The line of text to extract the calibration value out of
 * @returns {number} The two-digit calibration value hidden in that string 
 */
function extractCalibrationValue(line: string): number {
	const digitsInString = line.replace(/\D/g, "");

	return Number(digitsInString[0] + digitsInString[digitsInString.length - 1]);
}

const tests: string[] = [
	"1abc2",
	"pqr3stu8vwx",
	"a1b2c3d4e5f",
	"treb7uchet"
];

const input = await LoadInput(1);

console.log("Test Cases");
console.log("Expected: 142", `Actual: ${CalculateCalibrationSum(tests)}`);

console.log("Input");
console.log(`Your calibration sum ${CalculateCalibrationSum(input)}`);