export type PasswordStrengthLevel = "empty" | "weak" | "fair" | "good" | "strong"

export type PasswordStrength = {
  level: PasswordStrengthLevel
  score: number
  label: string
}

export function evaluatePasswordStrength(password: string): PasswordStrength {
  if (!password) {
    return { level: "empty", score: 0, label: "" }
  }

  let score = 0
  if (password.length >= 8) score += 1
  if (password.length >= 12) score += 1
  if (/[a-z]/.test(password) && /[A-Z]/.test(password)) score += 1
  if (/\d/.test(password)) score += 1
  if (/[^A-Za-z0-9]/.test(password)) score += 1

  if (score <= 1) {
    return { level: "weak", score, label: "Faible" }
  }
  if (score === 2) {
    return { level: "fair", score, label: "Moyen" }
  }
  if (score === 3 || score === 4) {
    return { level: "good", score, label: "Bon" }
  }
  return { level: "strong", score, label: "Fort" }
}

export function passwordsMatch(a: string, b: string): boolean | null {
  if (!a && !b) return null
  if (!b) return null
  return a === b
}