;; StacksTacToe - Decentralized PvP Tic-Tac-Toe Game
;; A winner-takes-all betting game on Stacks blockchain
;; Supports STX only
;; ============================================
;; Constants
;; ============================================
;; Contract owner
(define-constant CONTRACT_OWNER tx-sender)
;; Game parameters
(define-constant DEFAULT_MOVE_TIMEOUT u144) ;; ~24 hours in blocks (assuming 10 min blocks)
(define-constant MAX_TIMEOUT u1008) ;; ~7 days in blocks
(define-constant DEFAULT_BOARD_SIZE u3)
;; Game status
(define-constant STATUS_ACTIVE u0)
(define-constant STATUS_ENDED u1)
(define-constant STATUS_FORFEITED u2)
;; Player marks
(define-constant MARK_EMPTY u0)
(define-constant MARK_X u1)
(define-constant MARK_O u2)
;; Basis points for fee calculation (10000 = 100%)
(define-constant BASIS_POINTS u10000)
;; ============================================
;; Error Codes
;; ============================================
(define-constant ERR_INVALID_ID (err u100))
(define-constant ERR_NOT_ACTIVE (err u101))
(define-constant ERR_INVALID_MOVE (err u102))
(define-constant ERR_NOT_TURN (err u103))
(define-constant ERR_INVALID_BET (err u104))
(define-constant ERR_BET_MISMATCH (err u105))
(define-constant ERR_GAME_STARTED (err u106))
(define-constant ERR_CELL_OCCUPIED (err u107))
(define-constant ERR_TIMEOUT (err u108))
(define-constant ERR_UNAUTHORIZED (err u109))
(define-constant ERR_SELF_PLAY (err u110))
(define-constant ERR_TRANSFER_FAILED (err u111))
(define-constant ERR_INVALID_ADDR (err u112))
(define-constant ERR_NOT_ADMIN (err u116))
(define-constant ERR_INVALID_TIMEOUT (err u117))
(define-constant ERR_INVALID_FEE (err u118))
(define-constant ERR_NO_REWARD (err u123))
(define-constant ERR_REWARD_CLAIMED (err u124))
(define-constant ERR_NOT_WINNER (err u125))
(define-constant ERR_INVALID_BOARD_SIZE (err u126))
(define-constant ERR_GAME_NOT_FINISHED (err u127))
(define-constant ERR_PAUSED (err u129))
;; ============================================
;; Data Variables
;; ============================================
;; Admin and configuration
(define-data-var contract-paused bool false)
(define-data-var move-timeout uint DEFAULT_MOVE_TIMEOUT)
(define-data-var platform-fee-percent uint u0) ;; Default: no fee
(define-data-var platform-fee-recipient principal CONTRACT_OWNER)
;; Counters
(define-data-var game-id-counter uint u0)
;; ============================================
;; Data Maps
;; ============================================
;; Admin management
(define-map admins principal bool)
;; Game data
(define-map games
uint
{
player-one: principal,
player-two: (optional principal),
bet-amount: uint,
board-size: uint,
is-player-one-turn: bool,
winner: (optional principal),
last-move-block: uint,
status: uint
}
)
;; Game boards (game-id => cell-index => mark)
(define-map game-boards { game-id: uint, cell-index: uint } uint)
;; Claimable rewards
(define-map claimable-rewards uint uint)
(define-map reward-claimed uint bool)
;; ============================================
;; Initialization
;; ============================================
;; Set contract owner as admin
(map-set admins CONTRACT_OWNER true)
;; ============================================
;; Private Helper Functions
;; ============================================
(define-private (is-admin (caller principal))
(or
(is-eq caller CONTRACT_OWNER)
(default-to false (map-get? admins caller))
)
)
;; ============================================
;; Admin Functions
;; ============================================
(define-public (add-admin (admin principal))
(begin
(asserts! (is-eq tx-sender CONTRACT_OWNER) ERR_UNAUTHORIZED)
(ok (map-set admins admin true))
)
)
(define-public (remove-admin (admin principal))
(begin
(asserts! (is-eq tx-sender CONTRACT_OWNER) ERR_UNAUTHORIZED)
(ok (map-set admins admin false))
)
)
(define-public (set-move-timeout (new-timeout uint))
(begin
(asserts! (is-admin tx-sender) ERR_NOT_ADMIN)
(asserts! (and (> new-timeout u0) (<= new-timeout MAX_TIMEOUT)) ERR_INVALID_TIMEOUT)
(ok (var-set move-timeout new-timeout))
)
)
(define-public (set-platform-fee (new-fee-percent uint))
(begin
(asserts! (is-admin tx-sender) ERR_NOT_ADMIN)
(asserts! (<= new-fee-percent u1000) ERR_INVALID_FEE) ;; Max 10%
(ok (var-set platform-fee-percent new-fee-percent))
)
)
(define-public (set-platform-fee-recipient (recipient principal))
(begin
(asserts! (is-admin tx-sender) ERR_NOT_ADMIN)
(ok (var-set platform-fee-recipient recipient))
)
)
(define-public (pause-contract)
(begin
(asserts! (is-eq tx-sender CONTRACT_OWNER) ERR_UNAUTHORIZED)
(ok (var-set contract-paused true))
)
)
(define-public (unpause-contract)
(begin
(asserts! (is-eq tx-sender CONTRACT_OWNER) ERR_UNAUTHORIZED)
(ok (var-set contract-paused false))
)
)
;; ============================================
;; Game Functions
;; ============================================
(define-public (create-game (bet-amount uint) (move-index uint) (board-size uint))
(let
(
(game-id (var-get game-id-counter))
(max-cells (* board-size board-size))
)
(asserts! (not (var-get contract-paused)) ERR_PAUSED)
(asserts! (> bet-amount u0) ERR_INVALID_BET)
(asserts! (or (is-eq board-size u3) (is-eq board-size u5)) ERR_INVALID_BOARD_SIZE)
(asserts! (< move-index max-cells) ERR_INVALID_MOVE)
;; Handle STX payment
(try! (stx-transfer? bet-amount tx-sender (as-contract tx-sender)))
;; Create game
(map-set games game-id {
player-one: tx-sender,
player-two: none,
bet-amount: bet-amount,
board-size: board-size,
is-player-one-turn: false,
winner: none,
last-move-block: stacks-block-height,
status: STATUS_ACTIVE
})
;; Set first move
(map-set game-boards { game-id: game-id, cell-index: move-index } MARK_X)
;; Increment counter
(var-set game-id-counter (+ game-id u1))
(ok game-id)
)
)
(define-public (join-game (game-id uint) (move-index uint))
(let
(
(game (unwrap! (map-get? games game-id) ERR_INVALID_ID))
(max-cells (* (get board-size game) (get board-size game)))
(cell-value (default-to MARK_EMPTY (map-get? game-boards { game-id: game-id, cell-index: move-index })))
)
(asserts! (not (var-get contract-paused)) ERR_PAUSED)
(asserts! (is-eq (get status game) STATUS_ACTIVE) ERR_NOT_ACTIVE)
(asserts! (is-none (get player-two game)) ERR_GAME_STARTED)
(asserts! (not (is-eq tx-sender (get player-one game))) ERR_SELF_PLAY)
(asserts! (< move-index max-cells) ERR_INVALID_MOVE)
(asserts! (is-eq cell-value MARK_EMPTY) ERR_CELL_OCCUPIED)
;; Handle STX payment
(try! (stx-transfer? (get bet-amount game) tx-sender (as-contract tx-sender)))
;; Update game
(map-set games game-id (merge game {
player-two: (some tx-sender),
is-player-one-turn: true,
last-move-block: stacks-block-height
}))
;; Set second move
(map-set game-boards { game-id: game-id, cell-index: move-index } MARK_O)
(ok true)
)
)
(define-public (play (game-id uint) (move-index uint))
(let
(
(game (unwrap! (map-get? games game-id) ERR_INVALID_ID))
(max-cells (* (get board-size game) (get board-size game)))
(cell-value (default-to MARK_EMPTY (map-get? game-boards { game-id: game-id, cell-index: move-index })))
(player-two (unwrap! (get player-two game) ERR_NOT_ACTIVE))
)
(asserts! (not (var-get contract-paused)) ERR_PAUSED)
(asserts! (is-eq (get status game) STATUS_ACTIVE) ERR_NOT_ACTIVE)
(asserts! (< move-index max-cells) ERR_INVALID_MOVE)
(asserts! (is-eq cell-value MARK_EMPTY) ERR_CELL_OCCUPIED)
;; Check turn
(asserts!
(if (get is-player-one-turn game)
(is-eq tx-sender (get player-one game))
(is-eq tx-sender player-two)
)
ERR_NOT_TURN
)
;; Set move
(let
(
(mark (if (get is-player-one-turn game) MARK_X MARK_O))
)
(map-set game-boards { game-id: game-id, cell-index: move-index } mark)
;; Update game state
(map-set games game-id (merge game {
is-player-one-turn: (not (get is-player-one-turn game)),
last-move-block: stacks-block-height
}))
(ok true)
)
)
)
;; ============================================
;; Win Detection Helper Functions
;; ============================================
(define-private (get-cell (game-id uint) (cell-index uint))
(default-to MARK_EMPTY (map-get? game-boards { game-id: game-id, cell-index: cell-index }))
)
(define-private (check-three-in-row (game-id uint) (idx1 uint) (idx2 uint) (idx3 uint))
(let
(
(cell1 (get-cell game-id idx1))
(cell2 (get-cell game-id idx2))
(cell3 (get-cell game-id idx3))
)
(and
(not (is-eq cell1 MARK_EMPTY))
(is-eq cell1 cell2)
(is-eq cell2 cell3)
)
)
)
(define-private (check-winner-rows (game-id uint) (board-size uint))
(if (is-eq board-size u3)
;; 3x3 board
(or
(check-three-in-row game-id u0 u1 u2)
(or
(check-three-in-row game-id u3 u4 u5)
(check-three-in-row game-id u6 u7 u8)
)
)
(if (is-eq board-size u5)
;; 5x5 board - check all possible 3-in-a-row combinations
(or
;; Row 0
(or (check-three-in-row game-id u0 u1 u2) (or (check-three-in-row game-id u1 u2 u3) (check-three-in-row game-id u2 u3 u4)))
(or
;; Row 1
(or (check-three-in-row game-id u5 u6 u7) (or (check-three-in-row game-id u6 u7 u8) (check-three-in-row game-id u7 u8 u9)))
(or
;; Row 2
(or (check-three-in-row game-id u10 u11 u12) (or (check-three-in-row game-id u11 u12 u13) (check-three-in-row game-id u12 u13 u14)))
(or
;; Row 3
(or (check-three-in-row game-id u15 u16 u17) (or (check-three-in-row game-id u16 u17 u18) (check-three-in-row game-id u17 u18 u19)))
;; Row 4
(or (check-three-in-row game-id u20 u21 u22) (or (check-three-in-row game-id u21 u22 u23) (check-three-in-row game-id u22 u23 u24)))
)
)
)
)
false
)
)
)
(define-private (check-winner-cols (game-id uint) (board-size uint))
(if (is-eq board-size u3)
;; 3x3 board
(or
(check-three-in-row game-id u0 u3 u6)
(or
(check-three-in-row game-id u1 u4 u7)
(check-three-in-row game-id u2 u5 u8)
)
)
(if (is-eq board-size u5)
;; 5x5 board - check all possible 3-in-a-column combinations
(or
;; Col 0
(or (check-three-in-row game-id u0 u5 u10) (or (check-three-in-row game-id u5 u10 u15) (check-three-in-row game-id u10 u15 u20)))
(or
;; Col 1
(or (check-three-in-row game-id u1 u6 u11) (or (check-three-in-row game-id u6 u11 u16) (check-three-in-row game-id u11 u16 u21)))
(or
;; Col 2
(or (check-three-in-row game-id u2 u7 u12) (or (check-three-in-row game-id u7 u12 u17) (check-three-in-row game-id u12 u17 u22)))
(or
;; Col 3
(or (check-three-in-row game-id u3 u8 u13) (or (check-three-in-row game-id u8 u13 u18) (check-three-in-row game-id u13 u18 u23)))
;; Col 4
(or (check-three-in-row game-id u4 u9 u14) (or (check-three-in-row game-id u9 u14 u19) (check-three-in-row game-id u14 u19 u24)))
)
)
)
)
false
)
)
)
(define-private (check-winner-diagonals (game-id uint) (board-size uint))
(if (is-eq board-size u3)
;; 3x3 board
(or
(check-three-in-row game-id u0 u4 u8) ;; Top-left to bottom-right
(check-three-in-row game-id u2 u4 u6) ;; Top-right to bottom-left
)
(if (is-eq board-size u5)
;; 5x5 board - check all possible 3-in-a-diagonal combinations
(or
;; Main diagonals (top-left to bottom-right)
(or (check-three-in-row game-id u0 u6 u12) (or (check-three-in-row game-id u1 u7 u13) (or (check-three-in-row game-id u5 u11 u17) (or (check-three-in-row game-id u6 u12 u18) (or (check-three-in-row game-id u7 u13 u19) (or (check-three-in-row game-id u10 u16 u22) (or (check-three-in-row game-id u11 u17 u23) (check-three-in-row game-id u12 u18 u24))))))))
;; Anti-diagonals (top-right to bottom-left)
(or (check-three-in-row game-id u2 u6 u10) (or (check-three-in-row game-id u3 u7 u11) (or (check-three-in-row game-id u4 u8 u12) (or (check-three-in-row game-id u8 u12 u16) (or (check-three-in-row game-id u9 u13 u17) (or (check-three-in-row game-id u13 u17 u21) (or (check-three-in-row game-id u14 u18 u22) (check-three-in-row game-id u18 u22 u23))))))))
)
false
)
)
)
(define-private (check-board-full (game-id uint) (board-size uint))
(let
(
(max-cells (* board-size board-size))
)
(if (is-eq board-size u3)
;; Check all 9 cells for 3x3
(and
(not (is-eq (get-cell game-id u0) MARK_EMPTY))
(and
(not (is-eq (get-cell game-id u1) MARK_EMPTY))
(and
(not (is-eq (get-cell game-id u2) MARK_EMPTY))
(and
(not (is-eq (get-cell game-id u3) MARK_EMPTY))
(and
(not (is-eq (get-cell game-id u4) MARK_EMPTY))
(and
(not (is-eq (get-cell game-id u5) MARK_EMPTY))
(and
(not (is-eq (get-cell game-id u6) MARK_EMPTY))
(and
(not (is-eq (get-cell game-id u7) MARK_EMPTY))
(not (is-eq (get-cell game-id u8) MARK_EMPTY))
)
)
)
)
)
)
)
)
false
)
)
)
(define-private (has-winner (game-id uint) (board-size uint))
(or
(check-winner-rows game-id board-size)
(or
(check-winner-cols game-id board-size)
(check-winner-diagonals game-id board-size)
)
)
)
;; ============================================
;; Reward and Payout Functions
;; ============================================
(define-private (transfer-payout (recipient principal) (amount uint))
(as-contract (stx-transfer? amount tx-sender recipient))
)
(define-private (declare-winner (game-id uint) (winner principal))
(let
(
(game (unwrap! (map-get? games game-id) ERR_INVALID_ID))
(player-two (unwrap! (get player-two game) ERR_NOT_ACTIVE))
(loser (if (is-eq winner (get player-one game)) player-two (get player-one game)))
(total-pot (* (get bet-amount game) u2))
(fee-amount (/ (* total-pot (var-get platform-fee-percent)) BASIS_POINTS))
(winner-payout (- total-pot fee-amount))
)
;; Update game status
(map-set games game-id (merge game {
winner: (some winner),
status: STATUS_ENDED
}))
;; Store claimable reward
(map-set claimable-rewards game-id winner-payout)
;; Transfer platform fee if any
(if (> fee-amount u0)
(try! (transfer-payout (var-get platform-fee-recipient) fee-amount))
true
)
(ok true)
)
)
(define-private (handle-draw (game-id uint))
(let
(
(game (unwrap! (map-get? games game-id) ERR_INVALID_ID))
(refund-amount (get bet-amount game))
(player-two (unwrap! (get player-two game) ERR_NOT_ACTIVE))
)
;; Update game status
(map-set games game-id (merge game {
status: STATUS_ENDED
}))
;; Refund both players
(try! (transfer-payout (get player-one game) refund-amount))
(try! (transfer-payout player-two refund-amount))
(ok true)
)
)
(define-public (claim-reward (game-id uint))
(let
(
(game (unwrap! (map-get? games game-id) ERR_INVALID_ID))
(winner (unwrap! (get winner game) ERR_NO_REWARD))
(reward-amount (unwrap! (map-get? claimable-rewards game-id) ERR_NO_REWARD))
(already-claimed (default-to false (map-get? reward-claimed game-id)))
)
(asserts! (or (is-eq (get status game) STATUS_ENDED) (is-eq (get status game) STATUS_FORFEITED)) ERR_GAME_NOT_FINISHED)
(asserts! (not already-claimed) ERR_REWARD_CLAIMED)
(asserts! (is-eq tx-sender winner) ERR_NOT_WINNER)
;; Mark as claimed
(map-set reward-claimed game-id true)
(map-delete claimable-rewards game-id)
;; Transfer reward
(try! (transfer-payout winner reward-amount))
(ok true)
)
)
(define-public (forfeit-game (game-id uint))
(let
(
(game (unwrap! (map-get? games game-id) ERR_INVALID_ID))
(player-two (unwrap! (get player-two game) ERR_NOT_ACTIVE))
(timeout-block (+ (get last-move-block game) (var-get move-timeout)))
)
(asserts! (is-eq (get status game) STATUS_ACTIVE) ERR_NOT_ACTIVE)
(asserts! (>= stacks-block-height timeout-block) ERR_TIMEOUT)
;; Winner is the player who was NOT supposed to move (last player to move)
(let
(
(winner (if (get is-player-one-turn game) player-two (get player-one game)))
(total-pot (* (get bet-amount game) u2))
(fee-amount (/ (* total-pot (var-get platform-fee-percent)) BASIS_POINTS))
(winner-payout (- total-pot fee-amount))
)
;; Update game status
(map-set games game-id (merge game {
winner: (some winner),
status: STATUS_FORFEITED
}))
;; Store claimable reward
(map-set claimable-rewards game-id winner-payout)
;; Transfer platform fee if any
(if (> fee-amount u0)
(try! (transfer-payout (var-get platform-fee-recipient) fee-amount))
true
)
(ok true)
)
)
)
;; ============================================
;; Read-Only View Functions
;; ============================================
(define-read-only (get-game (game-id uint))
(ok (map-get? games game-id))
)
(define-read-only (get-game-board-cell (game-id uint) (cell-index uint))
(ok (get-cell game-id cell-index))
)
(define-read-only (get-latest-game-id)
(ok (var-get game-id-counter))
)
(define-read-only (get-claimable-reward (game-id uint))
(ok (map-get? claimable-rewards game-id))
)
(define-read-only (is-reward-claimed (game-id uint))
(ok (default-to false (map-get? reward-claimed game-id)))
)
(define-read-only (get-move-timeout)
(ok (var-get move-timeout))
)
(define-read-only (get-platform-fee)
(ok (var-get platform-fee-percent))
)
(define-read-only (is-contract-paused)
(ok (var-get contract-paused))
)