/**
 * Settings API Endpoint
 * 
 * Read and update trading bot configuration
 */

import { NextRequest, NextResponse } from 'next/server'
import fs from 'fs'
import path from 'path'

const ENV_FILE_PATH = path.join(process.cwd(), '.env')

function parseEnvFile(): Record<string, string> {
  try {
    const content = fs.readFileSync(ENV_FILE_PATH, 'utf-8')
    const env: Record<string, string> = {}
    
    content.split('\n').forEach(line => {
      // Skip comments and empty lines
      if (line.trim().startsWith('#') || !line.trim()) return
      
      const match = line.match(/^([A-Z_]+)=(.*)$/)
      if (match) {
        env[match[1]] = match[2]
      }
    })
    
    return env
  } catch (error) {
    console.error('Failed to read .env file:', error)
    return {}
  }
}

function updateEnvFile(updates: Record<string, any>) {
  try {
    let content = fs.readFileSync(ENV_FILE_PATH, 'utf-8')
    
    // Update each setting
    Object.entries(updates).forEach(([key, value]) => {
      const regex = new RegExp(`^${key}=.*$`, 'm')
      const newLine = `${key}=${value}`
      
      if (regex.test(content)) {
        content = content.replace(regex, newLine)
      } else {
        // Add new line if key doesn't exist
        content += `\n${newLine}`
      }
    })
    
    fs.writeFileSync(ENV_FILE_PATH, content, 'utf-8')
    return true
  } catch (error) {
    console.error('Failed to write .env file:', error)
    return false
  }
}

export async function GET() {
  try {
    const env = parseEnvFile()
    
    const settings = {
      MAX_POSITION_SIZE_USD: parseFloat(env.MAX_POSITION_SIZE_USD || '50'),
      LEVERAGE: parseFloat(env.LEVERAGE || '5'),
      STOP_LOSS_PERCENT: parseFloat(env.STOP_LOSS_PERCENT || '-1.5'),
      TAKE_PROFIT_1_PERCENT: parseFloat(env.TAKE_PROFIT_1_PERCENT || '0.7'),
      TAKE_PROFIT_1_SIZE_PERCENT: parseFloat(env.TAKE_PROFIT_1_SIZE_PERCENT || '50'),
      TAKE_PROFIT_2_PERCENT: parseFloat(env.TAKE_PROFIT_2_PERCENT || '1.5'),
      TAKE_PROFIT_2_SIZE_PERCENT: parseFloat(env.TAKE_PROFIT_2_SIZE_PERCENT || '50'),
      EMERGENCY_STOP_PERCENT: parseFloat(env.EMERGENCY_STOP_PERCENT || '-2.0'),
      BREAKEVEN_TRIGGER_PERCENT: parseFloat(env.BREAKEVEN_TRIGGER_PERCENT || '0.4'),
      PROFIT_LOCK_TRIGGER_PERCENT: parseFloat(env.PROFIT_LOCK_TRIGGER_PERCENT || '1.0'),
      PROFIT_LOCK_PERCENT: parseFloat(env.PROFIT_LOCK_PERCENT || '0.4'),
      MAX_DAILY_DRAWDOWN: parseFloat(env.MAX_DAILY_DRAWDOWN || '-50'),
      MAX_TRADES_PER_HOUR: parseInt(env.MAX_TRADES_PER_HOUR || '6'),
      MIN_TIME_BETWEEN_TRADES: parseInt(env.MIN_TIME_BETWEEN_TRADES || '600'),
      SLIPPAGE_TOLERANCE: parseFloat(env.SLIPPAGE_TOLERANCE || '1.0'),
      DRY_RUN: env.DRY_RUN === 'true',
    }
    
    return NextResponse.json(settings)
  } catch (error) {
    console.error('Failed to load settings:', error)
    return NextResponse.json(
      { error: 'Failed to load settings' },
      { status: 500 }
    )
  }
}

export async function POST(request: NextRequest) {
  try {
    const settings = await request.json()
    
    const updates = {
      MAX_POSITION_SIZE_USD: settings.MAX_POSITION_SIZE_USD.toString(),
      LEVERAGE: settings.LEVERAGE.toString(),
      STOP_LOSS_PERCENT: settings.STOP_LOSS_PERCENT.toString(),
      TAKE_PROFIT_1_PERCENT: settings.TAKE_PROFIT_1_PERCENT.toString(),
      TAKE_PROFIT_1_SIZE_PERCENT: settings.TAKE_PROFIT_1_SIZE_PERCENT.toString(),
      TAKE_PROFIT_2_PERCENT: settings.TAKE_PROFIT_2_PERCENT.toString(),
      TAKE_PROFIT_2_SIZE_PERCENT: settings.TAKE_PROFIT_2_SIZE_PERCENT.toString(),
      EMERGENCY_STOP_PERCENT: settings.EMERGENCY_STOP_PERCENT.toString(),
      BREAKEVEN_TRIGGER_PERCENT: settings.BREAKEVEN_TRIGGER_PERCENT.toString(),
      PROFIT_LOCK_TRIGGER_PERCENT: settings.PROFIT_LOCK_TRIGGER_PERCENT.toString(),
      PROFIT_LOCK_PERCENT: settings.PROFIT_LOCK_PERCENT.toString(),
      MAX_DAILY_DRAWDOWN: settings.MAX_DAILY_DRAWDOWN.toString(),
      MAX_TRADES_PER_HOUR: settings.MAX_TRADES_PER_HOUR.toString(),
      MIN_TIME_BETWEEN_TRADES: settings.MIN_TIME_BETWEEN_TRADES.toString(),
      SLIPPAGE_TOLERANCE: settings.SLIPPAGE_TOLERANCE.toString(),
      DRY_RUN: settings.DRY_RUN.toString(),
    }
    
    const success = updateEnvFile(updates)
    
    if (success) {
      return NextResponse.json({ success: true })
    } else {
      return NextResponse.json(
        { error: 'Failed to save settings' },
        { status: 500 }
      )
    }
  } catch (error) {
    console.error('Failed to save settings:', error)
    return NextResponse.json(
      { error: 'Failed to save settings' },
      { status: 500 }
    )
  }
}