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using System;
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using Duality;
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using Duality.Editor;
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namespace Steering
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{
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/// <summary>
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/// Defines the basic reactive behavior of an Agent
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/// </summary>
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public interface IAgentCharacteristics
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{
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/// <summary>
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/// [GET / SET] The preferred speed of the agent.
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/// </summary>
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[EditorHintFlags(MemberFlags.Invisible)]
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float PreferredSpeed { get; set; }
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/// <summary>
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/// [GET] The maximum speed of the agent.
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/// </summary>
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[EditorHintFlags(MemberFlags.Invisible)]
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float MaxSpeed { get; }
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/// <summary>
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/// Calculates the "cost" of a given velocity which are used to decide which velocity an agent should actually
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/// choose. There are multiple things this method needs to consider:
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/// <list type="bullet">
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/// <listheader>
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/// <term>Target</term>
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/// <description>Where does the agent want to move to?</description>
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/// </listheader>
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/// <listheader>
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/// <term>Speed</term>
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/// <description>How fast does the agent want to travel?</description>
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/// </listheader>
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/// <listheader>
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/// <term>Time of impact</term>
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/// <description>There are velocities which will lead to collisions with obstacles in the future</description>
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/// </listheader>
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/// <listheader>
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/// <term>Side</term>
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/// <description>It's often usful to prefer a "side" on which an agent avoids obstacles because it can help to reduce oscillations</description>
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/// </listheader>
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/// </list>
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/// Based on those the function should calculate the cost for a given velocity. To to this it should somehow combine different weighted scores.
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/// </summary>
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/// <param name="agent">The agent for which the cost should be evaluated</param>
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/// <param name="sampleVelocity">The velocity which should be evaluated</param>
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/// <param name="toiPenality">
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/// Normalized time of impact (between 0 and 1) for the velocity. A value of 0 means we are already colliding
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/// and a value of 1 means that a collision will occure earliest at the <see cref="Agent.ToiHorizon" />.
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/// </param>
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/// <returns>The cost for the given velocity which should be between 0 and 1</returns>
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float CalculateVelocityCost(Agent agent, Vector2 sampleVelocity, float toiPenality);
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}
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}
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