38eb9ee398
Rename game/ -> connect4/ to avoid c4/game stutter. Drop redundant
Game prefix from exported types (GameStore -> Store, GameInstance ->
Instance, GameStatus -> Status). Rename NATS subjects from game.{id}
to connect4.{id}. URL routes unchanged.
99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
// Package connect4 implements Connect 4 game logic, state management, and persistence.
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package connect4
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// DropPiece attempts to drop a piece in the given column.
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// Returns (row placed, success).
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func (g *Game) DropPiece(col, playerColor int) (int, bool) {
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if col < 0 || col > 6 {
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return -1, false
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}
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if g.CurrentTurn != playerColor {
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return -1, false
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}
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if g.Status != StatusInProgress {
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return -1, false
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}
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// Find lowest empty row in column
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for row := 5; row >= 0; row-- {
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if g.Board[row][col] == 0 {
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g.Board[row][col] = playerColor
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return row, true
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}
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}
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return -1, false // Column full
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}
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// CheckWin checks if the last move at (row, col) created a win.
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func (g *Game) CheckWin(row, col int) bool {
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color := g.Board[row][col]
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directions := [][2]int{
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{0, 1}, // Horizontal
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{1, 0}, // Vertical
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{1, 1}, // Diagonal down-right
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{1, -1}, // Diagonal down-left
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}
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for _, dir := range directions {
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cells := g.countLine(row, col, dir[0], dir[1], color)
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if len(cells) >= 4 {
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g.Status = StatusWon
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g.WinningCells = cells[:4]
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return true
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}
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}
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return false
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}
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func (g *Game) countLine(row, col, dr, dc, color int) [][2]int {
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cells := [][2]int{{row, col}}
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// Count in positive direction
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for r, c := row+dr, col+dc; r >= 0 && r < 6 && c >= 0 && c < 7; r, c = r+dr, c+dc {
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if g.Board[r][c] != color {
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break
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}
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cells = append(cells, [2]int{r, c})
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}
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// Count in negative direction
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for r, c := row-dr, col-dc; r >= 0 && r < 6 && c >= 0 && c < 7; r, c = r-dr, c-dc {
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if g.Board[r][c] != color {
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break
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}
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cells = append(cells, [2]int{r, c})
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}
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return cells
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}
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// CheckDraw checks if board is full with no winner.
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func (g *Game) CheckDraw() bool {
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for col := 0; col < 7; col++ {
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if g.Board[0][col] == 0 {
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return false
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}
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}
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g.Status = StatusDraw
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return true
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}
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// SwitchTurn alternates the current turn.
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func (g *Game) SwitchTurn() {
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if g.CurrentTurn == 1 {
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g.CurrentTurn = 2
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} else {
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g.CurrentTurn = 1
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}
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}
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// IsWinningCell checks if a cell is part of the winning line.
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func (g *Game) IsWinningCell(row, col int) bool {
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for _, cell := range g.WinningCells {
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if cell[0] == row && cell[1] == col {
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return true
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}
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}
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return false
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}
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