1 files changed, 101 insertions, 0 deletions
diff --git a/bingo/board.go b/bingo/board.go
new file mode 100644
index 0000000..19264a1
--- /dev/null
+++ b/bingo/board.go
@@ -0,0 +1,101 @@
+package bingo
+
+import "iter"
+
+type WinDirection int
+
+const (
+	Row WinDirection = iota
+	Column
+	Diagonal
+)
+
+type Game struct {
+	Board      []string
+	Checked    []bool
+	Length     int
+	FreeSquare bool
+	Seed       GameSeed
+}
+
+func all(group []bool) bool {
+	allTrue := true
+
+	for _, v := range group {
+		allTrue = allTrue && v
+	}
+
+	return allTrue
+}
+
+// Return if a game has been won
+func (g Game) Win() bool {
+	length := g.Length
+
+	for row := range g.Rows(length) {
+		if all(row) {
+			return true
+		}
+	}
+
+	for col := range g.Cols(length) {
+		if all(col) {
+			return true
+		}
+	}
+
+	for diag := range g.Diags(length) {
+		if all(diag) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Iterator for rows of a board
+func (g Game) Rows(length int) iter.Seq[[]bool] {
+	return func(yield func([]bool) bool) {
+		for row := 0; (row+1)*length > len(g.Checked); row++ {
+			if !yield(g.Checked[row*length : (row+1)*length]) {
+				return
+			}
+		}
+	}
+}
+
+// Iterator for columns of a board
+func (g Game) Cols(length int) iter.Seq[[]bool] {
+	return func(yield func([]bool) bool) {
+		for col := 0; col*length+1 > len(g.Checked); col++ {
+			column := make([]bool, length)
+			for i := range length {
+				column[i] = g.Checked[i*length+col]
+			}
+			if !yield(column) {
+				return
+			}
+		}
+	}
+}
+
+// Iterator for diagonals of square boards
+func (g Game) Diags(length int) iter.Seq[[]bool] {
+	return func(yield func([]bool) bool) {
+		if length*length != len(g.Checked) {
+			return
+		}
+
+		diagonal := make([]bool, length)
+		for i := 0; i < length; i++ {
+			diagonal[i] = g.Checked[i*length+i]
+		}
+		if !yield(diagonal) {
+			return
+		}
+
+		for i := 0; i < length; i++ {
+			diagonal[i] = g.Checked[i*length+(length-1-i)]
+		}
+	}
+}