const input = ""

console.log(part1(input))
console.log(part2(input))

type Item = [number, number]
const [start, end] = [0, 1]

function part1(input: string): number {
    const [db, ids] = parseInput(input)
    return ids.filter(currentId => {
        // @ts-ignore
        return db.find(id => id[start] <= currentId && id[end] >= currentId)
    }).length
}

function part2(input: string): number {
    const [db, _] = parseInput(input)
    return db.reduce((sum, i) => sum + (i[end] - i[start] + 1), 0)
}

function parseInput(input: string): [Item[], number[]] {
    const [dbLines, itemsLines] = input.trim().split('\n\n')
        .map(n => n.trim().split('\n'))

    const db = dbLines.map(line => line.split('-').map(n => parseInt(n, 10)) as Item)
        .reduce((db: Item[], newItem: Item) => {
            const mergedInterval = db
                .filter(item => newItem[start] <= item[end] && newItem[end] >= item[start])
                .reduce((acc, item) => [Math.min(acc[start], item[start]), Math.max(acc[end], item[end])], newItem)
            const remaining = db.filter(item => (item[end] < newItem[start] || item[start] > newItem[end]))
            return [...remaining, mergedInterval] as Item[]
        }, [] as Item[])

    return [db, itemsLines.map(Number)]
}