/**
 * Close Position API Endpoint
 * 
 * Closes an existing position (partially or fully)
 */

import { NextRequest, NextResponse } from 'next/server'
import { closePosition } from '@/lib/drift/orders'
import { initializeDriftService } from '@/lib/drift/client'

export const dynamic = 'force-dynamic'
export const runtime = 'nodejs'

interface CloseRequest {
  symbol: string // e.g., 'SOL-PERP'
  percentToClose?: number // 0-100, default 100 (close entire position)
}

export async function POST(request: NextRequest) {
  try {
    // Verify authorization
    const authHeader = request.headers.get('authorization')
    const expectedAuth = `Bearer ${process.env.API_SECRET_KEY}`
    
    if (!authHeader || authHeader !== expectedAuth) {
      return NextResponse.json(
        { success: false, error: 'Unauthorized' },
        { status: 401 }
      )
    }

    const body: CloseRequest = await request.json()
    const { symbol, percentToClose = 100 } = body

    if (!symbol) {
      return NextResponse.json(
        { success: false, error: 'Missing symbol' },
        { status: 400 }
      )
    }

    if (percentToClose < 0 || percentToClose > 100) {
      return NextResponse.json(
        { success: false, error: 'percentToClose must be between 0 and 100' },
        { status: 400 }
      )
    }

    console.log(`📊 Closing position: ${symbol} (${percentToClose}%)`)

    // Initialize Drift service if not already initialized
    await initializeDriftService()

    // Close position
    const result = await closePosition({
      symbol,
      percentToClose,
      slippageTolerance: 1.0,
    })

    if (!result.success) {
      return NextResponse.json(
        {
          success: false,
          error: 'Position close failed',
          message: result.error,
        },
        { status: 500 }
      )
    }

    return NextResponse.json({
      success: true,
      transactionSignature: result.transactionSignature,
      symbol,
      closePrice: result.closePrice,
      closedSize: result.closedSize,
      realizedPnL: result.realizedPnL,
      percentClosed: percentToClose,
    })

  } catch (error) {
    console.error('❌ Close position error:', error)
    return NextResponse.json(
      {
        success: false,
        error: 'Internal server error',
        message: error instanceof Error ? error.message : 'Unknown error',
      },
      { status: 500 }
    )
  }
}