Refactor code and rename project.

1 files changed, 118 insertions, 0 deletions

diff --git a/mines.kt b/mines.kt
new file mode 100644
index 0000000..b4d7d77
--- /dev/null
+++ b/mines.kt
@@ -0,0 +1,118 @@
+data class Tile(val adjacentMines: Int = 0, val mine: Boolean = false, val masked: Boolean = true)
+
+class Grid(val width: Int, val height: Int, val tiles: Array<Tile>) {
+    constructor(width: Int = 8, height: Int = 8, mines: Int = 10)
+    : this(width, height, Array<Tile>(width * height) { Tile() }) {
+        for (i in 0 until mines) {
+            val x = (0 until width).random()
+            val y = (0 until height).random()
+            placeMine(x, y)
+        }
+    }
+
+    private fun index(x: Int, y: Int) = y * width + x
+    private fun coordinatesValid(x: Int, y: Int) = y >= 0 && y < height && x >= 0 && x < width
+
+    private fun place(x: Int, y: Int, tile: Tile) {
+        tiles[index(x, y)] = tile
+    }
+
+    /**
+     * Returns the tile at the given coordinates.
+     *
+     * @throws IllegalArgumentException if the X coordinate is outside
+     * the range of [0, width), or if the Y coordinate is outside the
+     *  range of [0, height).
+     */
+    fun tile(x: Int, y: Int) = if (coordinatesValid(x, y)) {
+        tiles[index(x, y)]
+    } else {
+        throw IllegalArgumentException("Invalid coordinates (${x}, ${y})")
+    }
+
+    /**
+     * Places a mine at the given coordinates.
+     *
+     * @throws IllegalArgumentException if the X coordinate is outside
+     * the range of [0, width), or if the Y coordinate is outside the
+     *  range of [0, height).
+     */
+    fun placeMine(x: Int, y: Int) {
+        if (!coordinatesValid(x, y)) {
+            throw IllegalArgumentException("Invalid coordinates (${x}, ${y})")
+        }
+
+        place(x, y, Tile(mine = true))
+
+        val xMin = if (x - 1 < 0) { x } else { x - 1 }
+        val xMax = if (x + 1 >= width) { x } else { x + 1 }
+        val yMin = if (y - 1 < 0) { y } else { y - 1 }
+        val yMax = if (y + 1 >= height) { y } else { y + 1 }
+
+        for (y in yMin..yMax) {
+            for (x in xMin..xMax) {
+                with (tiles[index(x, y)]) {
+                    if (!mine) {
+                        place(x, y, copy(adjacentMines + 1))
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Reveals a tile at the given coordinates according to the game rules.
+     *
+     * @throws IllegalArgumentException if the X coordinate is outside
+     * the range of [0, width), or if the Y coordinate is outside the
+     *  range of [0, height).
+     */
+    fun reveal(x: Int, y: Int) {
+        if (!coordinatesValid(x, y) || !tile(x, y).masked) {
+            return;
+        }
+
+        with (tile(x, y)) {
+            place(x, y, copy(masked = false))
+
+            if (!mine && adjacentMines == 0) {
+                val xMin = if (x - 1 < 0) { x } else { x - 1 }
+                val xMax = if (x + 1 >= width) { x } else { x + 1 }
+                val yMin = if (y - 1 < 0) { y } else { y - 1 }
+                val yMax = if (y + 1 >= height) { y } else { y + 1 }
+
+                for (y in yMin..yMax) {
+                    for (x in xMin..xMax) {
+                        reveal(x, y)
+                    }
+                }
+            }
+        }
+    }
+
+    override fun toString(): String = buildString {
+        for (y in 0 until height) {
+            for (x in 0 until width) {
+                val tile = tile(x, y)
+                append(when {
+                    tile.masked -> "."
+                    tile.mine -> "M"
+                    tile.adjacentMines == 0 -> " "
+                    else -> tile.adjacentMines.toString()
+                } + " ")
+            }
+            append("\n")
+        }
+    }
+}
+
+fun main(args: Array<String>) {
+    val grid = Grid()
+
+    for (i in 0 until 9) {
+        val x = (0 until 8).random()
+        val y = (0 until 8).random()
+        grid.reveal(x, y)
+        println(grid)
+    }
+}