/**
 * Public Plans Hook
 *
 * Fetches public plans from the billing API for the marketing pricing page.
 * This endpoint doesn't require authentication.
 */

import { useQuery } from '@tanstack/react-query';
import axios from 'axios';
import { API_BASE_URL } from '../api/config';

// =============================================================================
// Types
// =============================================================================

export interface Feature {
  id: number;
  code: string;
  name: string;
  description: string;
  feature_type: 'boolean' | 'integer';
}

export interface PlanFeature {
  id: number;
  feature: Feature;
  bool_value: boolean | null;
  int_value: number | null;
  value: boolean | number | null;
}

export interface Plan {
  id: number;
  code: string;
  name: string;
  description: string;
  display_order: number;
  is_active: boolean;
}

export interface PublicPlanVersion {
  id: number;
  plan: Plan;
  version: number;
  name: string;
  is_public: boolean;
  is_legacy: boolean;
  price_monthly_cents: number;
  price_yearly_cents: number;
  transaction_fee_percent: string;
  transaction_fee_fixed_cents: number;
  trial_days: number;
  is_most_popular: boolean;
  show_price: boolean;
  marketing_features: string[];
  is_available: boolean;
  features: PlanFeature[];
  created_at: string;
}

// =============================================================================
// API Client (no auth required)
// =============================================================================

const publicApiClient = axios.create({
  baseURL: API_BASE_URL,
  headers: {
    'Content-Type': 'application/json',
  },
});

// =============================================================================
// API Functions
// =============================================================================

/**
 * Fetch public plans from the billing catalog.
 * No authentication required.
 */
export const fetchPublicPlans = async (): Promise<PublicPlanVersion[]> => {
  const response = await publicApiClient.get<PublicPlanVersion[]>('/billing/plans/');
  return response.data;
};

// =============================================================================
// Hook
// =============================================================================

/**
 * Hook to fetch public plans for the pricing page.
 */
export const usePublicPlans = () => {
  return useQuery({
    queryKey: ['publicPlans'],
    queryFn: fetchPublicPlans,
    staleTime: 5 * 60 * 1000, // 5 minutes
    gcTime: 30 * 60 * 1000, // 30 minutes (formerly cacheTime)
  });
};

// =============================================================================
// Helper Functions
// =============================================================================

/**
 * Format price from cents to dollars with currency symbol.
 */
export const formatPrice = (cents: number): string => {
  if (cents === 0) return '$0';
  return `$${(cents / 100).toFixed(0)}`;
};

/**
 * Get a feature value from a plan version by feature code.
 */
export const getPlanFeatureValue = (
  planVersion: PublicPlanVersion,
  featureCode: string
): boolean | number | null => {
  const planFeature = planVersion.features.find(
    (pf) => pf.feature.code === featureCode
  );
  return planFeature?.value ?? null;
};

/**
 * Check if a plan has a boolean feature enabled.
 */
export const hasPlanFeature = (
  planVersion: PublicPlanVersion,
  featureCode: string
): boolean => {
  const value = getPlanFeatureValue(planVersion, featureCode);
  return value === true;
};

/**
 * Get an integer limit from a plan version.
 * Returns 0 if not set (unlimited) or the actual limit.
 */
export const getPlanLimit = (
  planVersion: PublicPlanVersion,
  featureCode: string
): number => {
  const value = getPlanFeatureValue(planVersion, featureCode);
  return typeof value === 'number' ? value : 0;
};

/**
 * Format a limit value for display.
 * 0 means unlimited.
 */
export const formatLimit = (value: number): string => {
  if (value === 0) return 'Unlimited';
  return value.toLocaleString();
};