#if !hasFeature(Embedded)
import Foundation
#endif

@main
struct Day02 {
    #if hasFeature(Embedded)
    static func main() {
        gfxInitDefault()
        consoleInit(GFX_TOP, nil)

        run()

        // Main loop
        while aptMainLoop() {
            hidScanInput()
            let kDown = hidKeysDown()
            if kDown & KEY_START != 0 {
                break // break in order to return to hbmenu
            }

            gfxFlushBuffers()
            gfxSwapBuffers()
        }

        gfxExit()
    }

    #else
    static func main() {
        run()
    }
    #endif

    static func run() {
        print("Parsing...")
        let parsed = parseInput(realInput)
        print("Running Part 1...")
        part1(parsed)
        //part2(parsed)
        print("Finished!")
    }

    typealias ParsedInput = [(UInt64, UInt64)]

    static func parseInput(_ input: String) -> ParsedInput {
        input.split(separator: ",")
            .filter({ line in
                let split = line.split(separator: "-")
                return String(split[0]).count % 2 == 0 || String(split[1]).count % 2 == 0
            })
            .map({ line in
                let split = line.split(separator: "-")
                return (UInt64(split.first!)!, UInt64(split.last!)!)
            })
    }

    static func part1(_ input: ParsedInput) {
        var sum: UInt64 = 0
        for (lhs, rhs) in input {
            for cur in lhs...rhs {
                let cnt = String(cur).count
                guard cnt % 2 == 0 else { continue }
                let low = cur % UInt64(pow(10, (Double(cnt) / 2)))
                let hi = low * UInt64(pow(10, (Double(cnt) / 2)))
                if cur == hi + low {
                    sum += cur
                }
            }
        }
        print("Part 1: \(sum)")
    }

    static func part2(_ input: ParsedInput) {

    }
}

let testInput = """
11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124
"""

let realInput = """
492410748-492568208,246-390,49-90,16-33,142410-276301,54304-107961,12792-24543,3434259704-3434457648,848156-886303,152-223,1303-1870,8400386-8519049,89742532-89811632,535853-567216,6608885-6724046,1985013826-1985207678,585591-731454,1-13,12067202-12233567,6533-10235,6259999-6321337,908315-972306,831-1296,406-824,769293-785465,3862-5652,26439-45395,95-136,747698990-747770821,984992-1022864,34-47,360832-469125,277865-333851,2281-3344,2841977-2953689,29330524-29523460
"""