export type Plan = 'free' | 'standard' | 'premium'

export type Feature =
  | 'oral_t2_live'
  | 'detailed_report'
  | 'tips'
  | 'dashboard'
  | 'exam_mode'
  | 'pattern_analysis'
  | 'preparation_index'
  | 'basic_report'

export const PLANS = {
  free: {
    simulations_lifetime: 5,
    oral_t2_live: false,
    detailed_report: false,
    tips: false,
    dashboard: false,
    exam_mode: false,
    pattern_analysis: false,
    preparation_index: false,
  },
  standard: {
    simulations_lifetime: null,
    oral_t2_live: false,
    detailed_report: true,
    tips: true,
    dashboard: true,
    exam_mode: false,
    pattern_analysis: false,
    preparation_index: false,
  },
  premium: {
    simulations_lifetime: null,
    oral_t2_live: true,
    detailed_report: true,
    tips: true,
    dashboard: true,
    exam_mode: true,
    pattern_analysis: true,
    preparation_index: true,
  },
}

export function getPlanPermissions(plan: Plan) {
  const perms = PLANS[plan]
  if (!perms) {
    throw new Error(`Plan inconnu : ${plan}`)
  }
  return perms
}

export function canUserSimulate(user: { plan: string; simulations_used: number }): {
  allowed: boolean
  reason?: string
} {
  if (!(user.plan in PLANS)) {
    return { allowed: false, reason: 'invalid_plan' }
  }
  const plan = user.plan as Plan
  const perms = PLANS[plan]
  if (perms.simulations_lifetime !== null && user.simulations_used >= perms.simulations_lifetime) {
    return { allowed: false, reason: 'quota_reached' }
  }
  return { allowed: true }
}

export function checkFeatureAccess(plan: Plan, feature: Feature): boolean {
  if (feature === 'basic_report') return true
  const perms = PLANS[plan]
  if (!perms) return false
  return perms[feature as keyof typeof perms] === true
}