# IPC Bridge Architecture — D-020
# Godot client + Rust simulation server via subprocess/IPC
# Single-player: subprocess + local socket. Multiplayer: TCP (same protocol).

vars: {
  color-bg: "#2a3040"
  color-stroke: "#333340"
  color-text: "#c8d0e0"
  color-accent: "#c8d8f0"
  color-dim: "#1a1e24"
}

direction: right

godot: Godot Client {
  shape: hexagon
  style.fill: ${color-bg}
  style.stroke: ${color-accent}
  style.font-color: ${color-text}

  renderer: Renderer {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
  }
  ui: UI + HUD {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
  }
  audio: AudioManager {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
  }
  input: Input Capture {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
  }
  bridge_client: SimBridge (LocalBridge / NetworkBridge) {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-accent}
  }
}

transport: Transport Layer {
  style.fill: ${color-dim}
  style.stroke: ${color-accent}
  style.font-color: ${color-text}

  sp: Single-player\nUnix socket / localhost TCP {
    style.fill: ${color-bg}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
    style.stroke-dash: 4
  }
  mp: Multiplayer\nRemote TCP {
    style.fill: ${color-bg}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
    style.stroke-dash: 4
  }
}

rust: Rust Simulation Server {
  shape: hexagon
  style.fill: ${color-bg}
  style.stroke: ${color-accent}
  style.font-color: ${color-text}

  bridge_server: SimBridge (recv end) {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-accent}
  }
  ecs: bevy_ecs World {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
  }
  perception: Perception System {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
  }
  ai: AI + Storyteller {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
  }
  kg: Knowledge Graph {
    style.fill: ${color-dim}
    style.font-color: ${color-text}
    style.stroke: ${color-stroke}
  }
}

msgpack_out: PlayerInput (MessagePack) {
  shape: queue
  style.fill: ${color-dim}
  style.stroke: ${color-accent}
  style.font-color: ${color-text}
}

msgpack_in: ObserverSnapshot (MessagePack) {
  shape: queue
  style.fill: ${color-dim}
  style.stroke: ${color-accent}
  style.font-color: ${color-text}
}

godot.input -> msgpack_out: "semantic actions\n(MoveNorth, Interact, UsePerceptionMode)" {
  style.stroke: ${color-accent}
}
msgpack_out -> godot.bridge_client
godot.bridge_client -> transport.sp: "single-player" {
  style.stroke: ${color-accent}
  style.stroke-dash: 4
}
godot.bridge_client -> transport.mp: "multiplayer" {
  style.stroke: ${color-accent}
  style.stroke-dash: 4
}
transport.sp -> rust.bridge_server {
  style.stroke: ${color-accent}
  style.stroke-dash: 4
}
transport.mp -> rust.bridge_server {
  style.stroke: ${color-accent}
  style.stroke-dash: 4
}
rust.bridge_server -> rust.ecs: "dispatch input" {
  style.stroke: ${color-stroke}
}
rust.ecs -> rust.perception
rust.ecs -> rust.ai
rust.ecs -> rust.kg
rust.ecs -> msgpack_in: "ObserverSnapshot\n(entities, fog, sound events,\nmonologue triggers, HUD widgets)" {
  style.stroke: ${color-accent}
}
msgpack_in -> godot.bridge_client
godot.bridge_client -> godot.renderer
godot.bridge_client -> godot.ui
godot.bridge_client -> godot.audio