chore: import upstream snapshot with attribution

apps/sim/stores/chat/utils.ts

@@ -0,0 +1,112 @@
+import type { ChatPosition } from './types'
+
+/**
+ * Floating chat dimensions
+ */
+const DEFAULT_WIDTH = 305
+const DEFAULT_HEIGHT = 286
+
+/**
+ * Minimum chat dimensions (same as baseline default)
+ */
+export const MIN_CHAT_WIDTH = DEFAULT_WIDTH
+export const MIN_CHAT_HEIGHT = DEFAULT_HEIGHT
+
+/**
+ * Maximum chat dimensions
+ */
+export const MAX_CHAT_WIDTH = 500
+export const MAX_CHAT_HEIGHT = 600
+
+/** Inset gap between the viewport edge and the content window */
+const CONTENT_WINDOW_GAP = 8
+
+/**
+ * Calculate default position in top right of canvas, offset from panel edge
+ */
+const calculateDefaultPosition = (): ChatPosition => {
+  if (typeof window === 'undefined') {
+    return { x: 100, y: 100 }
+  }
+
+  const panelWidth = Number.parseInt(
+    getComputedStyle(document.documentElement).getPropertyValue('--panel-width') || '0'
+  )
+
+  const x = window.innerWidth - CONTENT_WINDOW_GAP - panelWidth - 32 - DEFAULT_WIDTH
+  const y = CONTENT_WINDOW_GAP + 32
+
+  return { x, y }
+}
+
+/**
+ * Get the default chat dimensions
+ */
+export const getDefaultChatDimensions = () => ({
+  width: DEFAULT_WIDTH,
+  height: DEFAULT_HEIGHT,
+})
+
+/**
+ * Calculate constrained position ensuring chat stays within bounds
+ */
+export const constrainChatPosition = (
+  position: ChatPosition,
+  width: number = DEFAULT_WIDTH,
+  height: number = DEFAULT_HEIGHT
+): ChatPosition => {
+  if (typeof window === 'undefined') {
+    return position
+  }
+
+  const sidebarWidth = Number.parseInt(
+    getComputedStyle(document.documentElement).getPropertyValue('--sidebar-width') || '0'
+  )
+  const panelWidth = Number.parseInt(
+    getComputedStyle(document.documentElement).getPropertyValue('--panel-width') || '0'
+  )
+  const terminalHeight = Number.parseInt(
+    getComputedStyle(document.documentElement).getPropertyValue('--terminal-height') || '0'
+  )
+
+  const minX = sidebarWidth
+  const maxX = window.innerWidth - CONTENT_WINDOW_GAP - panelWidth - width
+  const minY = CONTENT_WINDOW_GAP
+  const maxY = window.innerHeight - CONTENT_WINDOW_GAP - terminalHeight - height
+
+  return {
+    x: Math.max(minX, Math.min(maxX, position.x)),
+    y: Math.max(minY, Math.min(maxY, position.y)),
+  }
+}
+
+/**
+ * Get chat position (default if not set or if invalid)
+ * @param storedPosition - Stored position from store
+ * @param width - Chat width
+ * @param height - Chat height
+ * @returns Valid chat position
+ */
+export const getChatPosition = (
+  storedPosition: ChatPosition | null,
+  width: number = DEFAULT_WIDTH,
+  height: number = DEFAULT_HEIGHT
+): ChatPosition => {
+  if (!storedPosition) {
+    return calculateDefaultPosition()
+  }
+
+  // Validate stored position is still within bounds
+  const constrained = constrainChatPosition(storedPosition, width, height)
+
+  // If position significantly changed, it's likely invalid (window resized, etc)
+  // Return default position
+  const deltaX = Math.abs(constrained.x - storedPosition.x)
+  const deltaY = Math.abs(constrained.y - storedPosition.y)
+
+  if (deltaX > 100 || deltaY > 100) {
+    return calculateDefaultPosition()
+  }
+
+  return constrained
+}