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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/2048/Kotlin/2048.kotlin Normal file
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import java.io.BufferedReader
import java.io.InputStreamReader
const val positiveGameOverMessage = "So sorry, but you won the game."
const val negativeGameOverMessage = "So sorry, but you lost the game."
fun main(args: Array<String>) {
val grid = arrayOf(
arrayOf(0, 0, 0, 0),
arrayOf(0, 0, 0, 0),
arrayOf(0, 0, 0, 0),
arrayOf(0, 0, 0, 0)
)
val gameOverMessage = run2048(grid)
println(gameOverMessage)
}
fun run2048(grid: Array<Array<Int>>): String {
if (isGridSolved(grid)) return positiveGameOverMessage
else if (isGridFull(grid)) return negativeGameOverMessage
val populatedGrid = spawnNumber(grid)
display(populatedGrid)
return run2048(manipulateGrid(populatedGrid, waitForValidInput()))
}
fun isGridSolved(grid: Array<Array<Int>>): Boolean = grid.any { row -> row.contains(2048) }
fun isGridFull(grid: Array<Array<Int>>): Boolean = grid.all { row -> !row.contains(0) }
fun spawnNumber(grid: Array<Array<Int>>): Array<Array<Int>> {
val coordinates = locateSpawnCoordinates(grid)
val number = generateNumber()
return updateGrid(grid, coordinates, number)
}
fun locateSpawnCoordinates(grid: Array<Array<Int>>): Pair<Int, Int> {
val emptyCells = arrayListOf<Pair<Int, Int>>()
grid.forEachIndexed { x, row ->
row.forEachIndexed { y, cell ->
if (cell == 0) emptyCells.add(Pair(x, y))
}
}
return emptyCells[(Math.random() * (emptyCells.size - 1)).toInt()]
}
fun generateNumber(): Int = if (Math.random() > 0.10) 2 else 4
fun updateGrid(grid: Array<Array<Int>>, at: Pair<Int, Int>, value: Int): Array<Array<Int>> {
val updatedGrid = grid.copyOf()
updatedGrid[at.first][at.second] = value
return updatedGrid
}
fun waitForValidInput(): String {
val input = waitForInput()
return if (isValidInput(input)) input else waitForValidInput()
}
fun isValidInput(input: String): Boolean = arrayOf("a", "s", "d", "w").contains(input)
fun waitForInput(): String {
val reader = BufferedReader(InputStreamReader(System.`in`))
println("Direction? ")
return reader.readLine()
}
fun manipulateGrid(grid: Array<Array<Int>>, input: String): Array<Array<Int>> = when (input) {
"a" -> shiftCellsLeft(grid)
"s" -> shiftCellsDown(grid)
"d" -> shiftCellsRight(grid)
"w" -> shiftCellsUp(grid)
else -> throw IllegalArgumentException("Expected one of [a, s, d, w]")
}
fun shiftCellsLeft(grid: Array<Array<Int>>): Array<Array<Int>> =
grid.map(::mergeAndOrganizeCells).toTypedArray()
fun shiftCellsRight(grid: Array<Array<Int>>): Array<Array<Int>> =
grid.map { row -> mergeAndOrganizeCells(row.reversed().toTypedArray()).reversed().toTypedArray() }.toTypedArray()
fun shiftCellsUp(grid: Array<Array<Int>>): Array<Array<Int>> {
val rows: Array<Array<Int>> = arrayOf(
arrayOf(grid[0][0], grid[1][0], grid[2][0], grid[3][0]),
arrayOf(grid[0][1], grid[1][1], grid[2][1], grid[3][1]),
arrayOf(grid[0][2], grid[1][2], grid[2][2], grid[3][2]),
arrayOf(grid[0][3], grid[1][3], grid[2][3], grid[3][3])
)
val updatedGrid = grid.copyOf()
rows.map(::mergeAndOrganizeCells).forEachIndexed { rowIdx, row ->
updatedGrid[0][rowIdx] = row[0]
updatedGrid[1][rowIdx] = row[1]
updatedGrid[2][rowIdx] = row[2]
updatedGrid[3][rowIdx] = row[3]
}
return updatedGrid
}
fun shiftCellsDown(grid: Array<Array<Int>>): Array<Array<Int>> {
val rows: Array<Array<Int>> = arrayOf(
arrayOf(grid[3][0], grid[2][0], grid[1][0], grid[0][0]),
arrayOf(grid[3][1], grid[2][1], grid[1][1], grid[0][1]),
arrayOf(grid[3][2], grid[2][2], grid[1][2], grid[0][2]),
arrayOf(grid[3][3], grid[2][3], grid[1][3], grid[0][3])
)
val updatedGrid = grid.copyOf()
rows.map(::mergeAndOrganizeCells).forEachIndexed { rowIdx, row ->
updatedGrid[3][rowIdx] = row[0]
updatedGrid[2][rowIdx] = row[1]
updatedGrid[1][rowIdx] = row[2]
updatedGrid[0][rowIdx] = row[3]
}
return updatedGrid
}
fun mergeAndOrganizeCells(row: Array<Int>): Array<Int> = organize(merge(row.copyOf()))
fun merge(row: Array<Int>, idxToMatch: Int = 0, idxToCompare: Int = 1): Array<Int> {
if (idxToMatch >= row.size) return row
if (idxToCompare >= row.size) return merge(row, idxToMatch + 1, idxToMatch + 2)
if (row[idxToMatch] == 0) return merge(row, idxToMatch + 1, idxToMatch + 2)
return if (row[idxToMatch] == row[idxToCompare]) {
row[idxToMatch] *= 2
row[idxToCompare] = 0
merge(row, idxToMatch + 1, idxToMatch + 2)
} else {
if (row[idxToCompare] != 0) merge(row, idxToMatch + 1, idxToMatch + 2)
else merge(row, idxToMatch, idxToCompare + 1)
}
}
fun organize(row: Array<Int>, idxToMatch: Int = 0, idxToCompare: Int = 1): Array<Int> {
if (idxToMatch >= row.size) return row
if (idxToCompare >= row.size) return organize(row, idxToMatch + 1, idxToMatch + 2)
if (row[idxToMatch] != 0) return organize(row, idxToMatch + 1, idxToMatch + 2)
return if (row[idxToCompare] != 0) {
row[idxToMatch] = row[idxToCompare]
row[idxToCompare] = 0
organize(row, idxToMatch + 1, idxToMatch + 2)
} else {
organize(row, idxToMatch, idxToCompare + 1)
}
}
fun display(grid: Array<Array<Int>>) {
val prettyPrintableGrid = grid.map { row ->
row.map { cell ->
if (cell == 0) " " else java.lang.String.format("%4d", cell)
}
}
println("New Grid:")
prettyPrintableGrid.forEach { row ->
println("+----+----+----+----+")
row.forEach { print("|$it") }
println("|")
}
println("+----+----+----+----+")
}