The requirements system in Profectus is designed to handle various conditions that must be met before certain actions or features can be accessed by the player. These conditions can include resource amounts, completed challenges, or other milestones within the game.
To create a requirement, you can use one of the provided utility functions like createCostRequirement, createVisibilityRequirement, or createBooleanRequirement. These functions return a Requirement object with specific properties that define the requirement conditions.
Several features will have a requirements property that takes one or more requirements that must be fulfilled for a certain action to be performed with that feature.
When implementing requirements, you can use the displayRequirements utility. This utility is designed to give a human-readable string generated by the requirement(s) given, making it easier for players to understand the conditions needed to progress in the game. Typically features that support requirements will already use this utility internally.
You may need to "pay" requirements upon meeting their conditions and performing the associated action. This action typically involves spending resources or making other adjustments to the game state. The payRequirements function simplifies this process by handling the payment for one or more requirements, considering the number of levels to pay for. Additionally, custom pay functions like payByDivision and payByReset can be passed into createCostRequirement for more specialized cases.
Requirements can have multiple "levels", which are typically used for things like multi-level challenges with scaling requirements. When checking if requirements are met, the requirementsMet function can be used. It accepts a single requirement or an array of requirements.
Requirements that are just on/off, such as boolean or visibility requirements, will count as infinite levels when in the same array. This allows you to combine different types of requirements in the same array and use the maxRequirementsMet function to calculate the maximum number of levels that could be acquired with the current requirement states.
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