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import { Observable, of } from "rxjs";
import { concatAll, count, filter, groupBy, map, max, mergeMap, reduce, scan, tap, toArray } from 'rxjs/operators';
import { ExerciseModuleFunc } from "../types";
type Pair = [number, number];
const getColumnAndRow = (line: string): Pair => {
const chars = line.split("");
let lo: number, hi: number;
lo = 0; hi = 127;
for (let i = 0; i < 7; i += 1) {
const chr = chars[i];
const diff = hi - lo;
if (chr === "F") {
hi = Math.floor(hi - diff / 2);
}
else if (chr === "B") {
lo = Math.ceil(lo + diff / 2);
}
}
const row = hi;
lo = 0; hi = 7;
for (let i = 0; i < 3; i += 1) {
const chr = chars[i + 7];
const diff = hi - lo;
if (chr === "L") {
hi = Math.floor(hi - diff / 2);
}
else if (chr === "R") {
lo = Math.ceil(lo + diff / 2);
}
}
const col = hi;
return [col, row];
}
const findVacantSeats = (lst: Pair[]): Pair[] => {
const seatMap: boolean[][] = Array(128);
for (let i = 0; i < 127; i += 1) {
seatMap[i] = Array(8);
for (let j = 0; j < 7; j += 1) {
seatMap[i][j] = true;
}
}
for (let seat of lst) {
seatMap[seat[1]][seat[0]] = false;
}
const vacants: Pair[] = [];
for (let row = 0; row < 127; row += 1) {
for (let col = 0; col < 7; col += 1) {
if (seatMap[row][col] === true) {
vacants.push([col, row]);
}
}
}
return vacants;
}
const calcID = (pair: Pair) => pair[1] * 8 + pair[0];
const day5: ExerciseModuleFunc = async (input: string) => {
const prom1 = of(input).pipe(
map(l => l.split("\n")),
concatAll(),
map(getColumnAndRow),
map(calcID),
max()
).toPromise();
const prom2 = of(input).pipe(
map(l => l.split("\n")),
concatAll(),
map(getColumnAndRow),
toArray(),
map(findVacantSeats),
concatAll(),
map(calcID),
toArray()
).toPromise();
return Promise.all([prom1, prom2]);
}
export default day5;
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