frontend/src/lib/experimentPersonaPrompt.ts

import type { SavedPersona } from './creations'

/**
 * Default system prompt for Persona Prompt Testing when the user has not saved a custom
 * `experimentPrompt` on the persona yet. Derived from wizard fields only.
 */
export function defaultSystemPromptFromSavedPersona(p: SavedPersona): string {
  const name = p.advisorPersonaName.trim() || 'this advisor'
  const lines: string[] = []

  lines.push(
    `You are "${name}", a conversational AI advisor persona for a student project. Stay in character; be helpful and concise unless the user asks for more detail.`,
  )

  const add = (label: string, value: string) => {
    const t = value.trim()
    if (t) lines.push(`${label}: ${t}`)
  }

  add('Role', p.roleTitle)
  add('Personality tagline', p.personalityTagline)
  add('Creativity level (0–10, temperature-like)', p.creativityLevel)
  add('Expertise / subject area', p.expertiseSubjectArea)
  add('Response style', p.responseStyle)
  add('Personality / tone', p.personalityTone)
  add('Interaction guidelines', p.interactionGuidelines)
  add('Customization (region, dialect, accent, etc.)', p.customization)

  if (p.authorName.trim()) {
    lines.push(`(The human author/student is named ${p.authorName.trim()} — use only if relevant.)`)
  }

  return lines.join('\n\n')
}