import 'dotenv/config'

const requiredEnvVars = ['REVENUECAT_WEBHOOK_SECRET', 'FIREBASE_PROJECT_ID'] as const

type RequiredEnvVar = (typeof requiredEnvVars)[number]

/**
 * Validates that all required environment variables are set.
 * Throws an error with details if any are missing.
 */
export function validateEnv(): void {
  const missing: RequiredEnvVar[] = []

  for (const varName of requiredEnvVars) {
    const value = process.env[varName]
    if (!value || value.trim() === '') {
      missing.push(varName)
    }
  }

  if (missing.length > 0) {
    const message = missing.map(v => `  - ${v}`).join('\n')
    throw new Error(`Missing required environment variables:\n${message}`)
  }
}

/**
 * Safely retrieves a required environment variable.
 * Throws if not set (after validateEnv has been called).
 */
export function getEnv(varName: RequiredEnvVar): string {
  const value = process.env[varName]
  if (!value) {
    throw new Error(`Environment variable ${varName} is not set`)
  }
  return value
}