import { canvases, userGroups } from '~/server/utils/db'

export default defineEventHandler(async (event) => {
  const userId = getRouterParam(event, 'id')

  if (!userId) {
    throw createError({ statusCode: 400, message: 'User ID is required' })
  }

  // Get user's group memberships
  const userGroupIds = Array.from(userGroups.values())
    .filter(membership => membership.userId === userId)
    .map(membership => membership.groupId)

  // Get canvases owned by user or shared with user's groups
  const userCanvases = Array.from(canvases.values()).filter(canvas => {
    // User's own canvases
    if (canvas.ownerId === userId) return true
    // Group canvases
    if (canvas.groupId && userGroupIds.includes(canvas.groupId)) return true
    return false
  })

  const canvasList = userCanvases.map(canvas => ({
    id: canvas.id,
    name: canvas.name,
    ownerId: canvas.ownerId,
    createdAt: canvas.createdAt,
    updatedAt: canvas.updatedAt,
    isPublic: canvas.isPublic,
    groupId: canvas.groupId,
    nodeCount: canvas.nodes.length
  }))

  return { canvases: canvasList }
})