'use client'

import { useState, useEffect } from 'react'

export interface MedusaProductCategory {
  id: string
  name: string
  handle: string
}

export interface MedusaProduct {
  id: string
  title: string
  description?: string
  thumbnail?: string
  // variants is optional — Medusa API may omit it when fields param is not set
  variants?: Array<{ id: string; prices: Array<{ amount: number; currency_code: string }> }>
  images?: Array<{ url: string }>
  tags?: Array<{ value: string }>
  created_at?: string
  collection?: { id: string; title: string; handle: string } | null
  categories?: MedusaProductCategory[]
}

interface UseMedusaProductsResult {
  products: MedusaProduct[]
  loading: boolean
  isLoading: boolean  // alias for loading — both work
  error: string | null
}

type UseMedusaProductsOptions = number | { limit?: number; categoryId?: string }

// Accepts either a plain number or an options object — both call signatures are valid:
//   useMedusaProducts(4)
//   useMedusaProducts({ limit: 4, categoryId: 'cat_123' })
export function useMedusaProducts(options: UseMedusaProductsOptions = 12): UseMedusaProductsResult {
  // Extract scalars so useEffect deps are stable primitives, not object references.
  const limit = typeof options === 'number' ? options : (options.limit ?? 12)
  const categoryId = typeof options === 'number' ? undefined : options.categoryId

  const [products, setProducts] = useState<MedusaProduct[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    let controller = new AbortController()
    const fetchProducts = () => {
      controller = new AbortController()
      const params = new URLSearchParams({ limit: String(limit) })
      if (categoryId) params.set('categoryId', categoryId)
      fetch(`/api/medusa/products?${params}`, { signal: controller.signal })
        .then(res => res.ok ? res.json() : Promise.reject(res.status))
        .then(data => { setProducts(data.products ?? []); setLoading(false) })
        .catch(err => { if (err?.name !== 'AbortError') { setError(String(err)); setLoading(false) } })
    }
    fetchProducts()
    const interval = setInterval(fetchProducts, 30000)
    return () => { clearInterval(interval); controller.abort() }
  }, [limit, categoryId])

  return { products, loading, isLoading: loading, error }
}