/**
 * Integration Tests: Products (ERP) Store
 * Tests product catalog management with mocked API
 *
 * Run: npm run test:integration
 */

import { beforeEach, describe, expect, it } from 'vitest'
import { server } from '@/tests/mocks/server'
import { http, HttpResponse } from 'msw'

/**
 * Mock Products Store (placeholder until actual store is created)
 */
class MockProductsStore {
  products: any[] = []
  loading = false
  error: string | null = null
  filters: Record<string, any> = {}

  async fetchProducts() {
    this.loading = true
    try {
      const response = await fetch(
        `${process.env.VITE_API_BASE_URL || 'http://localhost:3000/api'}/products`
      )
      const data = await response.json()
      this.products = data.data || []
    } catch (err) {
      this.error = (err as Error).message
    } finally {
      this.loading = false
    }
  }

  async createProduct(payload: any) {
    this.loading = true
    try {
      const response = await fetch(
        `${process.env.VITE_API_BASE_URL || 'http://localhost:3000/api'}/products`,
        {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(payload)
        }
      )
      if (!response.ok) throw new Error('Creation failed')
      const data = await response.json()
      this.products.push(data)
      return data
    } catch (err) {
      this.error = (err as Error).message
      throw err
    } finally {
      this.loading = false
    }
  }

  async getProduct(productId: string) {
    this.loading = true
    try {
      const response = await fetch(
        `${process.env.VITE_API_BASE_URL || 'http://localhost:3000/api'}/products/${productId}`
      )
      if (!response.ok) throw new Error('Not found')
      const data = await response.json()
      return data
    } catch (err) {
      this.error = (err as Error).message
      throw err
    } finally {
      this.loading = false
    }
  }

  setFilter(key: string, value: any) {
    this.filters[key] = value
  }

  clearFilters() {
    this.filters = {}
  }
}

describe('Products (ERP) Store Integration', () => {
  let store: MockProductsStore

  beforeEach(() => {
    store = new MockProductsStore()
  })

  describe('fetchProducts', () => {
    it('loads products from ERP API', async () => {
      await store.fetchProducts()

      expect(store.products).toHaveLength(1)
      expect(store.products[0].productId).toBe('PROD-001')
      expect(store.products[0].productName).toBe('Product A')
      expect(store.loading).toBe(false)
    })

    it('includes product metadata', async () => {
      await store.fetchProducts()

      const product = store.products[0]
      expect(product).toHaveProperty('sku')
      expect(product).toHaveProperty('categoryId')
      expect(product).toHaveProperty('status')
      expect(product).toHaveProperty('createdAt')
    })

    it('handles empty product list', async () => {
      server.use(
        http.get('*/api/products', () => {
          return HttpResponse.json({ data: [] })
        })
      )

      await store.fetchProducts()

      expect(store.products).toHaveLength(0)
      expect(store.error).toBeNull()
    })
  })

  describe('createProduct', () => {
    it('creates new product with required fields', async () => {
      const payload = {
        sku: 'SKU-NEW',
        productName: 'New Product',
        categoryId: 'CAT-002'
      }

      const created = await store.createProduct(payload)

      expect(created.productId).toBe('PROD-NEW')
      expect(created.sku).toBe('SKU-NEW')
      expect(created.productName).toBe('New Product')
      expect(created.status).toBe('ACTIVE')
    })

    it('adds created product to store', async () => {
      const initialCount = store.products.length

      await store.createProduct({
        sku: 'SKU-NEW-2',
        productName: 'Another Product',
        categoryId: 'CAT-003'
      })

      expect(store.products.length).toBeGreaterThan(initialCount)
    })

    it('validates required fields', async () => {
      server.use(
        http.post('*/api/products', () => {
          return HttpResponse.json(
            { message: 'Product name is required' },
            { status: 400 }
          )
        })
      )

      await expect(
        store.createProduct({ sku: 'SKU-INVALID' })
      ).rejects.toThrow()
    })

    it('ensures unique SKU', async () => {
      server.use(
        http.post('*/api/products', () => {
          return HttpResponse.json(
            { message: 'SKU already exists' },
            { status: 409 }
          )
        })
      )

      await expect(
        store.createProduct({ sku: 'SKU-001', productName: 'Duplicate' })
      ).rejects.toThrow()
    })
  })

  describe('getProduct', () => {
    it('fetches single product by ID', async () => {
      const product = await store.getProduct('PROD-001')

      expect(product.productId).toBe('PROD-001')
      expect(product.productName).toBe('Product Sample')
    })

    it('handles product not found', async () => {
      server.use(
        http.get('*/api/products/:productId', () => {
          return HttpResponse.json(
            { message: 'Product not found' },
            { status: 404 }
          )
        })
      )

      await expect(store.getProduct('PROD-INVALID')).rejects.toThrow()
      expect(store.error).not.toBeNull()
    })
  })

  describe('product filtering', () => {
    beforeEach(async () => {
      server.use(
        http.get('*/api/products', () => {
          return HttpResponse.json({
            data: [
              { productId: 'PROD-001', categoryId: 'CAT-001', status: 'ACTIVE' },
              { productId: 'PROD-002', categoryId: 'CAT-001', status: 'ACTIVE' },
              { productId: 'PROD-003', categoryId: 'CAT-002', status: 'INACTIVE' },
              { productId: 'PROD-004', categoryId: 'CAT-002', status: 'ACTIVE' }
            ]
          })
        })
      )
      await store.fetchProducts()
    })

    it('filters by category', () => {
      store.setFilter('categoryId', 'CAT-001')

      const filtered = store.products.filter((p) => p.categoryId === store.filters.categoryId)
      expect(filtered).toHaveLength(2)
    })

    it('filters by status', () => {
      store.setFilter('status', 'ACTIVE')

      const filtered = store.products.filter((p) => p.status === store.filters.status)
      expect(filtered.length).toBeGreaterThan(0)
    })

    it('combines multiple filters', () => {
      store.setFilter('categoryId', 'CAT-001')
      store.setFilter('status', 'ACTIVE')

      const filtered = store.products.filter(
        (p) =>
          p.categoryId === store.filters.categoryId &&
          p.status === store.filters.status
      )
      expect(filtered).toHaveLength(2)
    })

    it('clears all filters', () => {
      store.setFilter('categoryId', 'CAT-001')
      store.setFilter('status', 'ACTIVE')
      store.clearFilters()

      expect(Object.keys(store.filters)).toHaveLength(0)
    })
  })

  describe('bulk operations', () => {
    it('handles bulk product creation', async () => {
      server.use(
        http.post('*/api/products/bulk', async ({ request }) => {
          const body = await request.json() as any
          return HttpResponse.json(
            {
              created: body.items.length,
              items: body.items.map((item: any, idx: number) => ({
                productId: `PROD-BULK-${idx + 1}`,
                ...item
              }))
            },
            { status: 201 }
          )
        })
      )

      const items = [
        { sku: 'SKU-BULK-1', productName: 'Bulk Product 1' },
        { sku: 'SKU-BULK-2', productName: 'Bulk Product 2' }
      ]

      const response = await fetch(
        `${process.env.VITE_API_BASE_URL || 'http://localhost:3000/api'}/products/bulk`,
        {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ items })
        }
      )

      const data = await response.json()
      expect(data.created).toBe(2)
      expect(data.items).toHaveLength(2)
    })
  })
})