# Predict Contract

The `Predict.sol` contract is one of Celestium games that facilitates prediction games. It is designed to work with other contracts, including [`PredictGame`](/smartcontracts-description/predict-contract/predict-game.md) for individual prediction games and [`ConservativeStaking`](/smartcontracts-description/conservative-staking.md) for staking mechanisms. This documentation outlines the key functionalities and components of the `Predict` contract.

## Key Components

### State Variables

* `core`: An `immutable` reference to the [`Core`](/smartcontracts-description/core.md) contract, central to the ecosystem.
* `staking`: An `immutable` reference to the [`ConservativeStaking`](/smartcontracts-description/conservative-staking.md) contract, for staking functionalities.
* `games`: An `address[]` private array holding addresses of all prediction game contracts.

### Events

* `GameCreated(address indexed game)`: Emitted when a new prediction game contract is created.
* `GameDeactivated(address indexed game)`: Emitted when a prediction game contract is deactivated.
* `GameActivated(address indexed game)`: Emitted when a prediction game contract is activated.
* **placeBet (internal)**: Transfers the bet amount to the game contract and calls `placeBet` on the specified `PredictGame`. This is used by the public `placeBet` function after validations.

## Functions

* **`addGame`**: Creates a new `PredictGame` contract with specified parameters, activates it, and emits `GameCreated`. It performs several checks to ensure valid parameters.
* **`deactivate`**: Deactivates a specified prediction game contract by calling its `deactivate` function and emits `GameDeactivated`.
* **`activate`**: Activates a specified prediction game contract by calling its `activate` function and emits `GameActivated`.
* **`placeBet`**: Places a bet on a specified prediction game. It transfers the bet amount (minus a fee) to the game contract and calls `placeBet` on the specified `PredictGame`.


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