/**
 * Single source of truth for assembling `codex` invocations.
 *
 * The review flow shells codex two ways — `codex resume <id>` and the
 * interactive `codex '<prompt>'` TUI — both sent to a terminal. Building the
 * flags in one place keeps `--dangerously-bypass-approvals-and-sandbox` and the
 * optional model / reasoning-effort `-c` overrides from drifting apart.
 *
 * Model and reasoning effort are free-form: an empty value omits the override
 * so codex falls back to its own `config.toml` default.
 */

export interface CodexCommandOpts {
  /** 'resume' = `codex resume <id>`；'interactive' = `codex '<prompt>'` */
  mode: 'resume' | 'interactive'
  /** resume 模式必填：codex thread id */
  sessionId?: string
  /** interactive 模式的 prompt（positional）。调用方保证不含单引号。 */
  prompt?: string
  /** 空 = 不传 `-c model=`，用 codex 默认 */
  model?: string
  /** 空 = 不传 `-c model_reasoning_effort=`，用 codex 默认。合法值 minimal/low/medium/high/xhigh */
  reasoningEffort?: string
}

const BYPASS_FLAG = '--dangerously-bypass-approvals-and-sandbox'

/**
 * `-c key=value` overrides for model / reasoning effort. Blank values are
 * dropped so codex keeps its config.toml default.
 */
function configOverrides(opts: CodexCommandOpts): string[] {
  const parts: string[] = []
  const model = opts.model?.trim()
  if (model)
    parts.push('-c', `model=${model}`)
  const effort = opts.reasoningEffort?.trim()
  if (effort)
    parts.push('-c', `model_reasoning_effort=${effort}`)
  return parts
}

/** Full shell command string (with `codex` prefix) for `terminal.sendText`. */
export function buildCodexCommandString(opts: CodexCommandOpts): string {
  const overrides = configOverrides(opts)
  const parts = opts.mode === 'resume'
    ? ['resume', ...overrides, BYPASS_FLAG, ...(opts.sessionId ? [opts.sessionId] : [])]
    : [...overrides, BYPASS_FLAG, ...(opts.prompt ? [`'${opts.prompt}'`] : [])]
  return ['codex', ...parts].join(' ')
}