import { resolveClaudeBin } from './claudeBin'

/**
 * Single source of truth for the `claude` (cc) terminal launch command.
 *
 * Every session entry point (brainstorm / implement / test / review / resume /
 * managed session) shells out `claude` with the same flags; building the
 * string in one place keeps those call sites from drifting apart.
 *
 * We deliberately pass no `--system-prompt`; cc runs with its own default
 * system prompt.
 */

export interface CcCommandOpts {
  /** Path passed to `--settings` (caller guarantees it contains no single quote). */
  profilePath: string
  /** e.g. 'high' → `--effort high`; omitted means no `--effort`. */
  effort?: string
  /** When set, append `--resume <id>`. Mutually exclusive with prompt; resume wins. */
  resumeSessionId?: string
  /** When set (and no resume), append the prompt as a positional `'<prompt>'` arg. */
  prompt?: string
}

function quoteIfNeeded(bin: string): string {
  return bin.includes(' ') ? `'${bin}'` : bin
}

export function buildCcCommand(opts: CcCommandOpts): string {
  const parts = [quoteIfNeeded(resolveClaudeBin() ?? 'claude')]
  if (opts.effort)
    parts.push(`--effort ${opts.effort}`)
  parts.push('--dangerously-skip-permissions', `--settings '${opts.profilePath}'`)
  // resume and prompt are mutually exclusive; a resumed session restores its
  // own conversation, so a fresh prompt would be meaningless.
  if (opts.resumeSessionId)
    parts.push(`--resume ${opts.resumeSessionId}`)
  else if (opts.prompt)
    parts.push(`'${opts.prompt}'`)
  return parts.join(' ')
}