/**
 * Integration Tests: Inventory (WMS) Store
 * Tests warehouse inventory management with mocked API
 *
 * Run: npm run test:integration
 */

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

/**
 * Mock Inventory Store (placeholder until actual store is created)
 */
class MockInventoryStore {
  inventory: any[] = []
  loading = false
  error: string | null = null

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

  async updateInventory(inventoryId: string, payload: any) {
    this.loading = true
    try {
      const response = await fetch(
        `${process.env.VITE_API_BASE_URL || 'http://localhost:3000/api'}/inventory/${inventoryId}`,
        {
          method: 'PATCH',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(payload)
        }
      )
      if (!response.ok) throw new Error('Update failed')
      const data = await response.json()
      const index = this.inventory.findIndex((i) => i.inventoryId === inventoryId)
      if (index !== -1) this.inventory[index] = data
      return data
    } catch (err) {
      this.error = (err as Error).message
      throw err
    } finally {
      this.loading = false
    }
  }
}

describe('Inventory (WMS) Store Integration', () => {
  let store: MockInventoryStore

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

  describe('fetchInventory', () => {
    it('loads inventory from WMS API', async () => {
      await store.fetchInventory()

      expect(store.inventory).toHaveLength(1)
      expect(store.inventory[0].inventoryId).toBe('INV-001')
      expect(store.inventory[0].qtyOnHand).toBe(1000)
      expect(store.loading).toBe(false)
      expect(store.error).toBeNull()
    })

    it('calculates available quantity correctly', async () => {
      await store.fetchInventory()

      const inv = store.inventory[0]
      const available = inv.qtyOnHand - inv.qtyReserved
      expect(available).toBe(900)
      expect(inv.qtyAvailable).toBe(available)
    })

    it('handles API errors gracefully', async () => {
      server.use(
        http.get('*/api/inventory', () => {
          return HttpResponse.json(
            { message: 'Database connection failed' },
            { status: 500 }
          )
        })
      )

      await store.fetchInventory()

      expect(store.error).not.toBeNull()
      expect(store.inventory).toHaveLength(0)
    })
  })

  describe('updateInventory', () => {
    beforeEach(async () => {
      await store.fetchInventory()
    })

    it('updates inventory quantities', async () => {
      const updates = { qtyOnHand: 1200, qtyReserved: 150 }
      const updated = await store.updateInventory('INV-001', updates)

      expect(updated.qtyOnHand).toBe(1200)
      expect(updated.qtyReserved).toBe(150)
      expect(updated.qtyAvailable).toBe(1050)
    })

    it('reflects updates in store', async () => {
      const updates = { qtyOnHand: 800, qtyReserved: 100 }
      await store.updateInventory('INV-001', updates)

      const inv = store.inventory.find((i) => i.inventoryId === 'INV-001')
      expect(inv?.qtyOnHand).toBe(800)
    })

    it('handles update validation errors', async () => {
      server.use(
        http.patch('*/api/inventory/:inventoryId', () => {
          return HttpResponse.json(
            { message: 'Quantity cannot be negative' },
            { status: 400 }
          )
        })
      )

      await expect(
        store.updateInventory('INV-001', { qtyOnHand: -100 })
      ).rejects.toThrow()
    })
  })

  describe('stock availability checks', () => {
    beforeEach(async () => {
      await store.fetchInventory()
    })

    it('reserves stock correctly', async () => {
      const initial = store.inventory[0]
      const reservation = 100

      const updated = await store.updateInventory('INV-001', {
        qtyOnHand: initial.qtyOnHand,
        qtyReserved: initial.qtyReserved + reservation
      })

      expect(updated.qtyAvailable).toBe(initial.qtyAvailable - reservation)
    })

    it('prevents over-reservation', async () => {
      const current = store.inventory[0]
      // Try to reserve more than available
      server.use(
        http.patch('*/api/inventory/:inventoryId', () => {
          return HttpResponse.json(
            { message: 'Cannot reserve more than available quantity' },
            { status: 422 }
          )
        })
      )

      await expect(
        store.updateInventory('INV-001', {
          qtyOnHand: current.qtyOnHand,
          qtyReserved: 10000 // Exceed available
        })
      ).rejects.toThrow()
    })
  })

  describe('multi-warehouse scenarios', () => {
    it('handles inventory across multiple warehouses', async () => {
      server.use(
        http.get('*/api/inventory', () => {
          return HttpResponse.json({
            data: [
              { inventoryId: 'INV-001', warehouseId: 'WH-SEOUL', qtyOnHand: 1000 },
              { inventoryId: 'INV-002', warehouseId: 'WH-BUSAN', qtyOnHand: 500 },
              { inventoryId: 'INV-003', warehouseId: 'WH-DAEGU', qtyOnHand: 300 }
            ]
          })
        })
      )

      const tempStore = new MockInventoryStore()
      await tempStore.fetchInventory()

      expect(tempStore.inventory).toHaveLength(3)
      const totalQty = tempStore.inventory.reduce((sum, inv) => sum + inv.qtyOnHand, 0)
      expect(totalQty).toBe(1800)
    })
  })
})