import { describe, it, expect } from 'vitest'
import {
  createBatches,
  getMissingOrders,
  runWithConcurrency
} from '../../src/main/services/erp/cleaner'
import type { ShouldDeleteParams } from '../../src/main/services/erp/cleaner'

describe('Cleaner Service (Unit)', () => {
  describe('shouldDeleteMaterial', () => {
    // Create a mock cleaner service (no auth needed for this pure function test)
    const mockCleaner = {
      shouldDeleteMaterial: (params: ShouldDeleteParams): boolean => {
        const { rowNumber, pendingQty, materialCode, deleteSet } = params

        // Check if material is in delete list
        if (!deleteSet.has(materialCode)) {
          return false
        }

        // Check row number range (7000-7999 are protected)
        if (rowNumber >= 7000 && rowNumber < 8000) {
          return false
        }

        // Check pending quantity (must be empty)
        if (pendingQty && pendingQty.trim() !== '') {
          return false
        }

        return true
      }
    }

    it('should skip materials with row number 7000-7999', () => {
      const testCases = [
        { rowNumber: 7000, pendingQty: '', materialCode: 'TEST001', expected: false },
        { rowNumber: 7500, pendingQty: '', materialCode: 'TEST001', expected: false },
        { rowNumber: 7999, pendingQty: '', materialCode: 'TEST001', expected: false },
        { rowNumber: 6999, pendingQty: '', materialCode: 'TEST001', expected: true },
        { rowNumber: 8000, pendingQty: '', materialCode: 'TEST001', expected: true }
      ]

      for (const tc of testCases) {
        const shouldDelete = mockCleaner.shouldDeleteMaterial({
          rowNumber: tc.rowNumber,
          pendingQty: tc.pendingQty,
          materialCode: tc.materialCode,
          deleteSet: new Set(['TEST001'])
        })
        expect(shouldDelete).toBe(tc.expected)
      }
    })

    it('should skip materials with non-empty pending quantity', () => {
      const result = mockCleaner.shouldDeleteMaterial({
        rowNumber: 100,
        pendingQty: '5',
        materialCode: 'TEST001',
        deleteSet: new Set(['TEST001'])
      })

      expect(result).toBe(false)
    })

    it('should skip materials not in delete list', () => {
      const result = mockCleaner.shouldDeleteMaterial({
        rowNumber: 100,
        pendingQty: '',
        materialCode: 'NOT_IN_LIST',
        deleteSet: new Set(['TEST001'])
      })

      expect(result).toBe(false)
    })

    it('should delete materials with empty pending qty and valid row number', () => {
      const testCases = [
        { rowNumber: 1, pendingQty: '', materialCode: 'TEST001', expected: true },
        { rowNumber: 100, pendingQty: '', materialCode: 'TEST001', expected: true },
        { rowNumber: 6999, pendingQty: '', materialCode: 'TEST001', expected: true },
        { rowNumber: 8000, pendingQty: '', materialCode: 'TEST001', expected: true },
        { rowNumber: 10000, pendingQty: '', materialCode: 'TEST001', expected: true }
      ]

      for (const tc of testCases) {
        const shouldDelete = mockCleaner.shouldDeleteMaterial({
          rowNumber: tc.rowNumber,
          pendingQty: tc.pendingQty,
          materialCode: tc.materialCode,
          deleteSet: new Set(['TEST001'])
        })
        expect(shouldDelete).toBe(tc.expected)
      }
    })

    it('should handle multiple conditions correctly', () => {
      // Material in list, valid row, no pending qty = should delete
      expect(
        mockCleaner.shouldDeleteMaterial({
          rowNumber: 100,
          pendingQty: '',
          materialCode: 'TEST001',
          deleteSet: new Set(['TEST001'])
        })
      ).toBe(true)

      // Material in list, protected row, no pending qty = should NOT delete
      expect(
        mockCleaner.shouldDeleteMaterial({
          rowNumber: 7500,
          pendingQty: '',
          materialCode: 'TEST001',
          deleteSet: new Set(['TEST001'])
        })
      ).toBe(false)

      // Material in list, valid row, has pending qty = should NOT delete
      expect(
        mockCleaner.shouldDeleteMaterial({
          rowNumber: 100,
          pendingQty: '10',
          materialCode: 'TEST001',
          deleteSet: new Set(['TEST001'])
        })
      ).toBe(false)

      // Material NOT in list = should NOT delete
      expect(
        mockCleaner.shouldDeleteMaterial({
          rowNumber: 100,
          pendingQty: '',
          materialCode: 'OTHER',
          deleteSet: new Set(['TEST001'])
        })
      ).toBe(false)
    })
  })

  describe('batch and concurrency helpers', () => {
    it('should split orders into batches', () => {
      const batches = createBatches(['A', 'B', 'C', 'D', 'E'], 2)
      expect(batches).toEqual([
        ['A', 'B'],
        ['C', 'D'],
        ['E']
      ])
    })

    it('should identify missing orders', () => {
      const missing = getMissingOrders(['SC1', 'SC2', 'SC3'], new Set(['SC1', 'SC3']))
      expect(missing).toEqual(['SC2'])
    })

    it('should respect concurrency limit', async () => {
      const items = [1, 2, 3, 4, 5, 6]
      let running = 0
      let peak = 0
      await runWithConcurrency(items, 2, async () => {
        running += 1
        peak = Math.max(peak, running)
        await new Promise((resolve) => setTimeout(resolve, 10))
        running -= 1
        return true
      })

      expect(peak).toBeLessThanOrEqual(2)
    })
  })
})