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Reveal safe cells for increasing\n * multiplier, or hit a mine and lose. Cash out anytime.\n */\n\nimport { secureRandomIndex } from \"../../helpers/crypto.ts\";\nimport { kv } from \"../../persistence/kv.ts\";\nimport type { MinesSession } from \"../types.ts\";\n\nexport const GRID_SIZE = 20; // 4 rows x 5 cols\nexport const MAX_MINES = 19;\nconst SESSION_TTL_MS = 5 * 60 * 1000;\n\nfunction sessionKey(guildId: string, userId: string): string {\n return `mines:${guildId}:${userId}`;\n}\n\n/** Generate a grid with `mineCount` randomly placed mines. */\nexport function generateGrid(mineCount: number): boolean[] {\n const grid = new Array(GRID_SIZE).fill(false);\n let placed = 0;\n while (placed < mineCount) {\n const idx = secureRandomIndex(GRID_SIZE);\n if (!grid[idx]) {\n grid[idx] = true;\n placed++;\n }\n }\n return grid;\n}\n\n/**\n * Calculate multiplier after `safePicks` safe picks with `mineCount` mines.\n * Based on probability: fair multiplier = C(total, picks) / C(safe, picks)\n * with 1% house edge.\n */\nexport function calculateMultiplier(mineCount: number, safePicks: number): number {\n if (safePicks === 0) return 1.0;\n const safeTotal = GRID_SIZE - mineCount;\n\n let probability = 1;\n for (let i = 0; i < safePicks; i++) {\n probability *= (safeTotal - i) / (GRID_SIZE - i);\n }\n\n const multiplier = 0.99 / probability;\n return Math.floor(multiplier * 100) / 100;\n}\n\n/** Reveal a cell. Returns whether it was safe. */\nexport function revealCell(\n session: MinesSession,\n cellIndex: number,\n): { safe: boolean; multiplier: number } {\n if (session.grid[cellIndex]) {\n // Hit a mine\n return { safe: false, multiplier: 0 };\n }\n\n session.revealed[cellIndex] = true;\n session.safePicks++;\n session.currentMultiplier = calculateMultiplier(session.mineCount, session.safePicks);\n return { safe: true, multiplier: session.currentMultiplier };\n}\n\n/** Format the grid for display. */\nexport function formatGrid(session: MinesSession, revealAll = false): string {\n const rows: string[] = [];\n for (let r = 0; r < 4; r++) {\n const cells: string[] = [];\n for (let c = 0; c < 5; c++) {\n const idx = r * 5 + c;\n if (revealAll) {\n cells.push(session.grid[idx] ? \":boom:\" : \":gem:\");\n } else if (session.revealed[idx]) {\n cells.push(\":gem:\");\n } else {\n cells.push(\":white_large_square:\");\n }\n }\n rows.push(cells.join(\" \"));\n }\n return rows.join(\"\\n\");\n}\n\nexport const mines = {\n async getSession(guildId: string, userId: string): Promise {\n const session = await kv.get(sessionKey(guildId, userId));\n if (session && Date.now() - session.createdAt > SESSION_TTL_MS) {\n await kv.delete(sessionKey(guildId, userId));\n return null;\n }\n return session;\n },\n\n async createSession(guildId: string, userId: string, bet: number, mineCount: number): Promise {\n const session: MinesSession = {\n guildId,\n userId,\n bet,\n mineCount,\n grid: generateGrid(mineCount),\n revealed: new Array(GRID_SIZE).fill(false),\n safePicks: 0,\n currentMultiplier: 1.0,\n status: \"playing\",\n createdAt: Date.now(),\n };\n await kv.set(sessionKey(guildId, userId), session);\n return session;\n },\n\n async updateSession(session: MinesSession): Promise {\n await kv.set(sessionKey(session.guildId, session.userId), session);\n },\n\n async deleteSession(guildId: string, userId: string): Promise {\n await kv.delete(sessionKey(guildId, userId));\n },\n};\n\nexport const _internals = { sessionKey, SESSION_TTL_MS };\n","deleted","label",[183,184,185,165],"discord","games","casino","permalink","https://www.val.town/x/catalloc/catnip/code/discord/games/casino/mines.ts","extension","actionData","errors"]