/**
 * Pyramiding/Position Stacking Integration Tests
 * 
 * Tests for the pyramiding feature that allows scaling into winning positions
 * by adding to existing trades when confirmation signals arrive within a time window.
 * 
 * Based on: PYRAMIDING_IMPLEMENTATION_PLAN.md
 * - Stacking Window: 4 hours (240 minutes / 48 bars on 5-min chart)
 * - Base Leverage: 7x (first entry)
 * - Stack Leverage: 7x (additional entry)
 * - Max Total Leverage: 14x (7x + 7x = 2 pyramid levels)
 * - Max Pyramid Levels: 2 (base + 1 stack)
 */

import { ActiveTrade } from '../../../lib/trading/position-manager'
import { createMockTrade, createLongTrade, createShortTrade, TEST_DEFAULTS } from '../../helpers/trade-factory'

// Mock dependencies
jest.mock('../../../lib/drift/client', () => ({
  getDriftService: jest.fn(() => ({
    isInitialized: true,
    getClient: jest.fn(() => ({
      getUser: jest.fn(() => ({
        getPerpPosition: jest.fn(() => ({ baseAssetAmount: 1000000000n })),
      })),
    })),
    getPosition: jest.fn(() => ({
      baseAssetAmount: 1000000000n,
      quoteAssetAmount: 140000000n,
      size: 1,
      notional: 140,
    })),
    getConnection: jest.fn(() => ({
      confirmTransaction: jest.fn(() => ({ value: { err: null } })),
    })),
    openPosition: jest.fn(() => ({ 
      signature: 'mock-open-tx',
      entry: { price: 140.00, size: 8000 }
    })),
    closePosition: jest.fn(() => ({
      signature: 'mock-close-tx',
      exitPrice: 141.20
    })),
  })),
  initializeDriftService: jest.fn(),
}))

jest.mock('../../../lib/pyth/price-monitor', () => ({
  getPythPriceMonitor: jest.fn(() => ({
    start: jest.fn(),
    stop: jest.fn(),
    getLatestPrice: jest.fn(() => 140.00),
    onPriceUpdate: jest.fn(),
  })),
}))

jest.mock('../../../lib/database/trades', () => ({
  getPrismaClient: jest.fn(() => ({
    trade: {
      findUnique: jest.fn(() => null),
      update: jest.fn(() => ({})),
      findMany: jest.fn(() => []),
    },
    $disconnect: jest.fn(),
  })),
  createTrade: jest.fn(() => ({ id: 'mock-trade-id' })),
  updateTradeExit: jest.fn(() => ({})),
  updateTradeState: jest.fn(() => ({})),
}))

jest.mock('../../../lib/notifications/telegram', () => ({
  sendPositionClosedNotification: jest.fn(),
  sendPyramidGroupClosedNotification: jest.fn(),
  sendTelegramMessage: jest.fn(),
}))

// Module-level helper to create pyramided trade
function createPyramidTrade(options: Partial<ActiveTrade> & {
  pyramidLevel?: number
  parentTradeId?: string | null
  stackedAt?: Date | null
  isStackedPosition?: boolean
} = {}): ActiveTrade & {
  pyramidLevel: number
  parentTradeId: string | null
  stackedAt: Date | null
  isStackedPosition: boolean
} {
  const base = createLongTrade()
  return {
    ...base,
    ...options,
    pyramidLevel: options.pyramidLevel ?? 1,
    parentTradeId: options.parentTradeId ?? null,
    stackedAt: options.stackedAt ?? null,
    isStackedPosition: options.isStackedPosition ?? false,
  } as ActiveTrade & {
    pyramidLevel: number
    parentTradeId: string | null
    stackedAt: Date | null
    isStackedPosition: boolean
  }
}

describe('Pyramiding/Position Stacking', () => {
  beforeEach(() => {
    jest.clearAllMocks()
  })

  describe('Pyramid Detection - shouldStackPosition()', () => {

    it('should detect stacking opportunity when same direction + within window', () => {
      // Base position opened 2 hours ago (within 4-hour window)
      const basePosition = createPyramidTrade({
        pyramidLevel: 1,
        isStackedPosition: false,
      })
      basePosition.entryTime = Date.now() - (2 * 60 * 60 * 1000) // 2 hours ago
      
      const newSignal = {
        symbol: 'SOL-PERP',
        direction: 'long' as const,
      }
      
      // Within 4-hour window and same direction
      const timeSinceEntry = Date.now() - basePosition.entryTime
      const isWithinWindow = timeSinceEntry <= 4 * 60 * 60 * 1000 // 4 hours
      const isSameDirection = basePosition.direction === newSignal.direction
      const canStack = basePosition.pyramidLevel < 2 // Max 2 levels
      
      expect(isWithinWindow).toBe(true)
      expect(isSameDirection).toBe(true)
      expect(canStack).toBe(true)
    })

    it('should NOT detect stacking when opposite direction', () => {
      const basePosition = createPyramidTrade({
        pyramidLevel: 1,
      })
      basePosition.direction = 'long'
      
      const newSignal = {
        symbol: 'SOL-PERP',
        direction: 'short' as const, // Opposite direction
      }
      
      const isSameDirection = basePosition.direction === newSignal.direction
      
      expect(isSameDirection).toBe(false)
    })

    it('should NOT detect stacking when outside time window', () => {
      const basePosition = createPyramidTrade({
        pyramidLevel: 1,
      })
      basePosition.entryTime = Date.now() - (5 * 60 * 60 * 1000) // 5 hours ago (outside 4-hour window)
      
      const timeSinceEntry = Date.now() - basePosition.entryTime
      const isWithinWindow = timeSinceEntry <= 4 * 60 * 60 * 1000
      
      expect(isWithinWindow).toBe(false)
    })

    it('should NOT detect stacking when max pyramid levels reached', () => {
      const basePosition = createPyramidTrade({
        pyramidLevel: 2, // Already at max
      })
      
      const canStack = basePosition.pyramidLevel < 2
      
      expect(canStack).toBe(false)
    })

    it('should NOT stack on different symbols', () => {
      const basePosition = createPyramidTrade()
      basePosition.symbol = 'SOL-PERP'
      
      const newSignal = {
        symbol: 'ETH-PERP', // Different symbol
        direction: 'long' as const,
      }
      
      const isSameSymbol = basePosition.symbol === newSignal.symbol
      
      expect(isSameSymbol).toBe(false)
    })
  })

  describe('Pyramid Group Tracking', () => {
    it('should track base position as pyramid level 1', () => {
      const baseTrade = createPyramidTrade({
        pyramidLevel: 1,
        isStackedPosition: false,
        parentTradeId: null,
      })
      
      expect(baseTrade.pyramidLevel).toBe(1)
      expect(baseTrade.isStackedPosition).toBe(false)
      expect(baseTrade.parentTradeId).toBeNull()
    })

    it('should track stacked position with correct parent reference', () => {
      const baseTrade = createPyramidTrade({
        pyramidLevel: 1,
        isStackedPosition: false,
      })
      baseTrade.id = 'base-trade-123'
      
      const stackedTrade = createPyramidTrade({
        pyramidLevel: 2,
        isStackedPosition: true,
        parentTradeId: 'base-trade-123',
        stackedAt: new Date(),
      })
      
      expect(stackedTrade.pyramidLevel).toBe(2)
      expect(stackedTrade.isStackedPosition).toBe(true)
      expect(stackedTrade.parentTradeId).toBe('base-trade-123')
      expect(stackedTrade.stackedAt).toBeDefined()
    })

    it('should calculate combined size for pyramid group', () => {
      const baseSize = 8000
      const stackSize = 8000
      const combinedSize = baseSize + stackSize
      
      expect(combinedSize).toBe(16000) // 7x + 7x = 14x leverage equivalent
    })

    it('should calculate weighted average entry for pyramid group', () => {
      const baseEntry = 140.00
      const baseSize = 8000
      const stackEntry = 141.50
      const stackSize = 8000
      
      // Weighted average entry
      const totalSize = baseSize + stackSize
      const avgEntry = (baseEntry * baseSize + stackEntry * stackSize) / totalSize
      
      expect(avgEntry).toBe(140.75) // Midpoint between entries
    })
  })

  describe('Unified Exit (Close Pyramid Group)', () => {
    it('should close base position and all stacked positions together', () => {
      const baseTrade = createPyramidTrade({
        id: 'base-trade',
        pyramidLevel: 1,
        isStackedPosition: false,
        positionSize: 8000,
      })
      
      const stackedTrade = createPyramidTrade({
        id: 'stacked-trade',
        pyramidLevel: 2,
        parentTradeId: 'base-trade',
        isStackedPosition: true,
        positionSize: 8000,
      })
      
      // Simulating unified exit - both trades should be marked for closure
      const pyramidGroup = [baseTrade, stackedTrade]
      const totalSize = pyramidGroup.reduce((sum, t) => sum + t.positionSize, 0)
      
      expect(pyramidGroup.length).toBe(2)
      expect(totalSize).toBe(16000)
    })

    it('should calculate combined P&L for pyramid group', () => {
      const basePnL = 50.00 // $50 profit on base
      const stackedPnL = 25.00 // $25 profit on stack (entered later, less move)
      const combinedPnL = basePnL + stackedPnL
      
      expect(combinedPnL).toBe(75.00)
    })

    it('should trigger unified exit when any position hits SL', () => {
      // When base position hits SL, both should close
      const baseHitsSL = true
      const shouldCloseGroup = baseHitsSL
      
      expect(shouldCloseGroup).toBe(true)
    })

    it('should trigger unified exit when any position hits TP', () => {
      // When stacked position hits TP2, both should close
      const stackedHitsTP = true
      const shouldCloseGroup = stackedHitsTP
      
      expect(shouldCloseGroup).toBe(true)
    })
  })

  describe('Leverage Calculation', () => {
    it('should apply base leverage (7x) for first entry', () => {
      const baseLeverage = 7
      const positionSize = 560 // $560 collateral
      const notional = positionSize * baseLeverage
      
      expect(notional).toBe(3920) // $3,920 notional
    })

    it('should apply stack leverage (7x) for additional entry', () => {
      const stackLeverage = 7
      const positionSize = 560
      const notional = positionSize * stackLeverage
      
      expect(notional).toBe(3920)
    })

    it('should respect max total leverage (14x)', () => {
      const baseLeverage = 7
      const stackLeverage = 7
      const totalLeverage = baseLeverage + stackLeverage
      const maxAllowed = 14
      
      expect(totalLeverage).toBe(maxAllowed)
      expect(totalLeverage).toBeLessThanOrEqual(maxAllowed)
    })

    it('should block stacking if would exceed max leverage', () => {
      const currentLeverage = 10 // Already at 10x
      const stackLeverage = 7
      const maxAllowed = 14
      const wouldExceed = (currentLeverage + stackLeverage) > maxAllowed
      
      expect(wouldExceed).toBe(true)
    })
  })

  describe('Notification Context', () => {
    it('should include pyramid level in individual trade notifications', () => {
      const notification = {
        symbol: 'SOL-PERP',
        direction: 'long',
        pnl: 50.00,
        pyramidLevel: 2,
        isStackedPosition: true,
      }
      
      expect(notification.pyramidLevel).toBe(2)
      expect(notification.isStackedPosition).toBe(true)
    })

    it('should provide combined stats for group notifications', () => {
      const groupNotification = {
        symbol: 'SOL-PERP',
        direction: 'long',
        exitReason: 'TP2',
        totalPositions: 2,
        combinedPnL: 75.00,
        combinedSize: 16000,
        avgEntryPrice: 140.75,
        exitPrice: 142.50,
        pyramidLevels: [1, 2],
      }
      
      expect(groupNotification.totalPositions).toBe(2)
      expect(groupNotification.combinedPnL).toBe(75.00)
      expect(groupNotification.pyramidLevels).toContain(1)
      expect(groupNotification.pyramidLevels).toContain(2)
    })
  })

  describe('Edge Cases', () => {
    it('should handle stacking at exact window boundary (4 hours)', () => {
      const windowMs = 4 * 60 * 60 * 1000 // 4 hours in ms
      const entryTime = Date.now() - windowMs // Exactly 4 hours ago
      
      const timeSinceEntry = Date.now() - entryTime
      const isWithinWindow = timeSinceEntry <= windowMs
      
      // Boundary should be inclusive
      expect(isWithinWindow).toBe(true)
    })

    it('should handle stacking just outside window (4h 1min)', () => {
      const windowMs = 4 * 60 * 60 * 1000
      const entryTime = Date.now() - windowMs - (60 * 1000) // 4h 1min ago
      
      const timeSinceEntry = Date.now() - entryTime
      const isWithinWindow = timeSinceEntry <= windowMs
      
      expect(isWithinWindow).toBe(false)
    })

    it('should prevent third pyramid level', () => {
      const currentLevel = 2 // Already at level 2
      const maxLevels = 2
      const canAddMore = currentLevel < maxLevels
      
      expect(canAddMore).toBe(false)
    })

    it('should handle single position (no stack) gracefully', () => {
      const singleTrade = createLongTrade()
      ;(singleTrade as any).pyramidLevel = 1
      ;(singleTrade as any).isStackedPosition = false
      ;(singleTrade as any).parentTradeId = null
      
      // Single position should still work, just with pyramidLevel 1
      const isBaseTrade = (singleTrade as any).pyramidLevel === 1 && !(singleTrade as any).isStackedPosition
      
      expect(isBaseTrade).toBe(true)
    })

    it('should calculate correct P&L when base wins and stack loses', () => {
      const basePnL = 80.00 // Base entered early, good entry
      const stackPnL = -30.00 // Stack entered late, worse entry
      const combinedPnL = basePnL + stackPnL
      
      expect(combinedPnL).toBe(50.00) // Net positive
    })

    it('should calculate correct P&L when both lose', () => {
      const basePnL = -40.00
      const stackPnL = -35.00
      const combinedPnL = basePnL + stackPnL
      
      expect(combinedPnL).toBe(-75.00) // Net negative
    })
  })
})