export interface PascalAgentConfig {
  apiKey: string
  baseUrl: string
  configured: boolean
  maxOutputTokens: number
  maxSteps: number
  model: string
  stepTimeoutMs: number
  totalTimeoutMs: number
}

const DEFAULT_BASE_URL = 'https://api.openai.com/v1'
const DEFAULT_MODEL = 'gpt-4.1-mini'

function readBoundedInteger(
  value: string | undefined,
  fallback: number,
  minimum: number,
  maximum: number,
): number {
  const parsed = Number.parseInt(value ?? '', 10)
  if (!Number.isFinite(parsed)) return fallback
  return Math.min(maximum, Math.max(minimum, parsed))
}

export function getPascalAgentConfig(env: NodeJS.ProcessEnv = process.env): PascalAgentConfig {
  const apiKey = env.PASCAL_AGENT_API_KEY?.trim() ?? ''
  const baseUrl = (env.PASCAL_AGENT_BASE_URL?.trim() || DEFAULT_BASE_URL).replace(/\/$/, '')
  const model = env.PASCAL_AGENT_MODEL?.trim() || DEFAULT_MODEL

  return {
    apiKey,
    baseUrl,
    configured: apiKey.length > 0 && model.length > 0,
    maxOutputTokens: readBoundedInteger(env.PASCAL_AGENT_MAX_OUTPUT_TOKENS, 8192, 1024, 32_768),
    maxSteps: readBoundedInteger(env.PASCAL_AGENT_MAX_STEPS, 18, 4, 40),
    model,
    stepTimeoutMs: readBoundedInteger(env.PASCAL_AGENT_STEP_TIMEOUT_MS, 90_000, 10_000, 180_000),
    totalTimeoutMs: readBoundedInteger(env.PASCAL_AGENT_TOTAL_TIMEOUT_MS, 300_000, 30_000, 600_000),
  }
}