import { readNodeFileSyncWithinLimit } from '../shared/node-bounded-file-reader'
import { assertJsonTextStructureWithinLimits } from '../shared/json-text-structure-limit'

export const MAX_AGENT_STATE_FILE_BYTES = 4 * 1024 * 1024
export const MAX_AGENT_STATE_JSON_STRUCTURAL_TOKENS = 1_000_000
export const MAX_AGENT_STATE_JSON_NESTING_DEPTH = 128

export function readAgentStateFileSync(filePath: string): string {
  return readNodeFileSyncWithinLimit(filePath, MAX_AGENT_STATE_FILE_BYTES).buffer.toString('utf8')
}

export function readAgentStateJsonFileSync(filePath: string): unknown {
  const content = readAgentStateFileSync(filePath)
  assertJsonTextStructureWithinLimits(content, {
    structuralTokens: MAX_AGENT_STATE_JSON_STRUCTURAL_TOKENS,
    nestingDepth: MAX_AGENT_STATE_JSON_NESTING_DEPTH
  })
  return JSON.parse(content) as unknown
}