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football/docs/specs/2026-05-09-tactical-ai-design.md
Vladimir V Maksimov aece34fe73 feat: initial commit with M1-M4 implementation
2026-05-12 10:54:09 +03:00

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Design: Tactical AI and Goalie (M4)

Goal

Implement a "smart" goalie that covers angles and a zone-based tactical system for players to make the game feel more professional and less like a simple "chase the puck" simulation.

Architecture

The system extends the existing steering-based movement. Instead of a simple target, the target is now determined by a combination of the player's role and the current game zone.

1. Goalie AI (The Interceptor)

The goalie's primary objective is to block the path between the puck and the goal center.

  • Anchor Point: The center of the goalie's own goal.
  • Positioning Logic:
    • Calculate the vector from the goal center to the puck.
    • The goalie attempts to stay on this vector, effectively "cutting off the angle".
    • Constraint: The goalie is restricted to a small semi-circle (radius ~100-150px) around the goal center to prevent them from wandering into the midfield.
    • Idle State: When the puck is far away, the goalie returns to the center of the goal.
  • Movement: Uses the existing steering physics for smooth transitions.

2. Zone-Based Tactics

The field is divided into three zones for each team: Defensive, Middle, and Offensive.

Role Defensive Zone Middle Zone Offensive Zone
Striker Return to Middle/Offensive Support attack Aggressively pursue puck
Defender Aggressively pursue puck Maintain position/Support Stay back (Insurance)
Goalie Intercept puck Stay in goal area Stay in goal area

3. Technical Details

  • Constants: Define WorldZoneWidth (1/3 of field width) and GoalieRadius to avoid magic numbers.
  • Role Update: Add RoleGoalie to PlayerRole enum.
  • Logic Flow: Puck Position \rightarrow Zone Detection \rightarrow Role-based Target Calculation \rightarrow Steering \rightarrow Movement.

File Changes

  • internal/entities/player.go: Add RoleGoalie.
  • internal/game/world.go:
    • Add zone and goal constants.
    • Implement updateGoalieAI.
    • Refactor updatePlayerAI to use zone-based logic.
  • internal/game/world_test.go: Add tests for goalie positioning and zone transitions.

Edge Cases

  • Puck behind goal: Goalie resets to center.
  • Crowding: Existing anti-clumping logic prevents players from stacking on top of the goalie.
  • Jitter: Implement a small distance threshold before updating the target to prevent micro-oscillations.