import { randomUUID, type UUID } from 'node:crypto'
import type { UserMessage } from '../../types/message.js'

export function buildSummaryPrompt(previousSummary: string | null): string {
  const prevLine = previousSummary
    ? `\nPrevious: "${previousSummary}" — say something NEW.\n`
    : ''

  return `Describe your most recent action in 3-5 words using present tense (-ing). Name the file or function, not the branch. Do not use tools.
${prevLine}
Good: "Reading runAgent.ts"
Good: "Fixing null check in validate.ts"
Good: "Running auth module tests"
Good: "Adding retry logic to fetchUser"

Bad (past tense): "Analyzed the branch diff"
Bad (too vague): "Investigating the issue"
Bad (too long): "Reviewing full branch diff and AgentTool.tsx integration"
Bad (branch name): "Analyzed adam/background-summary branch diff"`
}

export function createSummaryPromptMessage(content: string): UserMessage {
  return {
    type: 'user',
    message: {
      role: 'user',
      content,
    },
    uuid: randomUUID() as UUID,
    timestamp: new Date().toISOString(),
  }
}