import { NextRequest, NextResponse } from 'next/server'
import { Keypair, PublicKey, VersionedTransaction } from '@solana/web3.js'
import BN from 'bn.js'
import { Decimal } from 'decimal.js'
import bs58 from 'bs58'
import { chain } from '@/lib/config'

export async function POST(request: NextRequest) {
	try {
		const body = await request.json()
		const { nftMintAddress, addUsdValue } = body

		// 验证输入
		if (!nftMintAddress) {
			return NextResponse.json(
				{ error: 'Position NFT address is required' },
				{ status: 400 }
			)
		}

		if (!addUsdValue || addUsdValue <= 0) {
			return NextResponse.json(
				{ error: 'Add USD value must be greater than 0' },
				{ status: 400 }
			)
		}

		const nftMint = new PublicKey(nftMintAddress)

		// 获取仓位信息
		const positionInfo = await chain.getPositionInfoByNftMint(nftMint)
		if (!positionInfo) {
			return NextResponse.json({ error: 'Position not found' }, { status: 404 })
		}

		const { rawPoolInfo } = positionInfo
		const poolInfo = rawPoolInfo

		// 使用 currentPrice (A/B 价格) 来计算 token 的 USD 价格
		const currentPrice = poolInfo.currentPrice

		// 稳定币地址
		const USDC_ADDRESS = 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v'
		const USDT_ADDRESS = 'Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB'
		const USD1_ADDRESS = 'USD1ttGY1N17NEEHLmELoaybftRBUSErhqYiQzvEmuB'

		const tokenAAddress = poolInfo.mintA.toBase58()
		const tokenBAddress = poolInfo.mintB.toBase58()

		// 判断哪个 token 是稳定币
		const isTokenAStable =
			tokenAAddress === USDC_ADDRESS ||
			tokenAAddress === USDT_ADDRESS ||
			tokenAAddress === USD1_ADDRESS
		const isTokenBStable =
			tokenBAddress === USDC_ADDRESS ||
			tokenBAddress === USDT_ADDRESS ||
			tokenBAddress === USD1_ADDRESS

		// 计算 token 的 USD 价格
		let tokenAPriceUsd = 0
		let tokenBPriceUsd = 0
		let priceFromApi = false

		// 尝试从 ByReal API 获取真实价格
		try {
			const response = await fetch(
				`https://api2.byreal.io/byreal/api/dex/v2/position/detail?address=${nftMintAddress}`,
				{
					method: 'GET',
					headers: {
						accept: 'application/json',
					},
				}
			)

			if (response.ok) {
				const data = await response.json()
				const poolData = data.result?.data?.pool

				if (poolData?.mintA?.price && poolData?.mintB?.price) {
					tokenAPriceUsd = parseFloat(poolData.mintA.price)
					tokenBPriceUsd = parseFloat(poolData.mintB.price)
					priceFromApi = true
					console.log('Using prices from ByReal API:', {
						tokenAPriceUsd,
						tokenBPriceUsd,
					})
				}
			}
		} catch (error) {
			console.warn('Failed to fetch prices from API:', error)
		}

		// 如果 API 获取失败，使用稳定币逻辑或默认逻辑
		if (!priceFromApi) {
			if (isTokenBStable) {
				tokenBPriceUsd = 1
				tokenAPriceUsd = currentPrice
			} else if (isTokenAStable) {
				tokenAPriceUsd = 1
				tokenBPriceUsd = 1 / currentPrice
			} else {
				// 非稳定币对且无法获取价格时，使用相对价格
				// 以 tokenB 为基准（价格为1），tokenA 价格为 currentPrice
				tokenBPriceUsd = 1
				tokenAPriceUsd = currentPrice
				console.warn(
					'Warning: Non-stablecoin pair without API prices. Using relative pricing.'
				)
			}
		}

		// 获取仓位的当前价格范围
		const priceLower = positionInfo.priceLower
		const priceUpper = positionInfo.priceUpper

		// 使用较小的 token 作为 base
		const useTokenAAsBase = tokenAPriceUsd <= tokenBPriceUsd
		const base = useTokenAAsBase ? 'MintA' : 'MintB'

		// 计算 baseAmount
		const targetValue = addUsdValue * 0.995 // 99.5%，更接近最大值
		let baseAmount: BN
		let otherAmountMax: BN

		if (base === 'MintA') {
			const estimatedPricePerBase =
				tokenAPriceUsd +
				((priceLower.toNumber() + priceUpper.toNumber()) / 2) * tokenBPriceUsd

			// 迭代调整 baseAmount
			let low = new BN(0)
			let high = new BN(
				Math.ceil(
					(targetValue / estimatedPricePerBase) *
						10 ** poolInfo.mintDecimalsA *
						1.5
				)
			)
			let bestBaseAmount = new BN(0)
			let bestValue = 0

			for (let i = 0; i < 30; i++) {
				const mid = low.add(high).div(new BN(2))
				if (mid.eq(low) || mid.eq(high)) break

				const testBaseAmount = mid
				const testOtherAmount = chain.getAmountBFromAmountA({
					priceLower,
					priceUpper,
					amountA: testBaseAmount,
					poolInfo,
				})

				const testUiAmountA = new Decimal(testBaseAmount.toString()).div(
					10 ** poolInfo.mintDecimalsA
				)
				const testUiAmountB = new Decimal(testOtherAmount.toString()).div(
					10 ** poolInfo.mintDecimalsB
				)
				const testValue =
					testUiAmountA.toNumber() * tokenAPriceUsd +
					testUiAmountB.toNumber() * tokenBPriceUsd

				if (testValue <= targetValue && testValue > bestValue) {
					bestValue = testValue
					bestBaseAmount = testBaseAmount
				}

				if (testValue > targetValue) {
					high = mid
				} else {
					low = mid
				}
			}

			baseAmount = bestBaseAmount.gt(new BN(0)) ? bestBaseAmount : low

			// 计算需要的 tokenB 数量
			const otherAmountNeeded = chain.getAmountBFromAmountA({
				priceLower,
				priceUpper,
				amountA: baseAmount,
				poolInfo,
			})

			// 添加 2% slippage
			otherAmountMax = otherAmountNeeded.mul(new BN(10200)).div(new BN(10000))
		} else {
			const midPrice = priceLower.add(priceUpper).div(2)
			const estimatedPricePerBase =
				tokenBPriceUsd + (1 / midPrice.toNumber()) * tokenAPriceUsd

			let low = new BN(0)
			let high = new BN(
				Math.ceil(
					(targetValue / estimatedPricePerBase) *
						10 ** poolInfo.mintDecimalsB *
						1.5
				)
			)
			let bestBaseAmount = new BN(0)
			let bestValue = 0

			for (let i = 0; i < 30; i++) {
				const mid = low.add(high).div(new BN(2))
				if (mid.eq(low) || mid.eq(high)) break

				const testBaseAmount = mid
				const testOtherAmount = chain.getAmountAFromAmountB({
					priceLower,
					priceUpper,
					amountB: testBaseAmount,
					poolInfo,
				})

				const testUiAmountA = new Decimal(testOtherAmount.toString()).div(
					10 ** poolInfo.mintDecimalsA
				)
				const testUiAmountB = new Decimal(testBaseAmount.toString()).div(
					10 ** poolInfo.mintDecimalsB
				)
				const testValue =
					testUiAmountA.toNumber() * tokenAPriceUsd +
					testUiAmountB.toNumber() * tokenBPriceUsd

				if (testValue <= targetValue && testValue > bestValue) {
					bestValue = testValue
					bestBaseAmount = testBaseAmount
				}

				if (testValue > targetValue) {
					high = mid
				} else {
					low = mid
				}
			}

			baseAmount = bestBaseAmount.gt(new BN(0)) ? bestBaseAmount : low

			// 计算需要的 tokenA 数量
			const otherAmountNeeded = chain.getAmountAFromAmountB({
				priceLower,
				priceUpper,
				amountB: baseAmount,
				poolInfo,
			})

			// 添加 2% slippage
			otherAmountMax = otherAmountNeeded.mul(new BN(10200)).div(new BN(10000))
		}

		// 检查代币数量是否为0
		if (baseAmount.eq(new BN(0)) || otherAmountMax.eq(new BN(0))) {
			console.error('Error: One of the token amounts is zero')
			return NextResponse.json(
				{
					error:
						'添加流动性失败：其中一个代币数量为0。请确保两个代币都有数量。',
					details: {
						baseAmount: baseAmount.toString(),
						otherAmountMax: otherAmountMax.toString(),
						base,
					},
				},
				{ status: 400 }
			)
		}

		// 计算最终 UI 金额
		const uiAmountA =
			base === 'MintA'
				? new Decimal(baseAmount.toString()).div(10 ** poolInfo.mintDecimalsA)
				: new Decimal(otherAmountMax.toString()).div(
						10 ** poolInfo.mintDecimalsA
					)
		const uiAmountB =
			base === 'MintB'
				? new Decimal(baseAmount.toString()).div(10 ** poolInfo.mintDecimalsB)
				: new Decimal(otherAmountMax.toString()).div(
						10 ** poolInfo.mintDecimalsB
					)

		// 打印所有信息
		console.log('\n========== Add Liquidity Information ==========')
		console.log('Position NFT Address:', nftMint.toBase58())
		console.log('\n--- Pool Information ---')
		console.log('Pool Address:', poolInfo.poolId.toBase58())
		console.log('Token A Address:', poolInfo.mintA.toBase58())
		console.log('Token B Address:', poolInfo.mintB.toBase58())
		console.log('Token A Decimals:', poolInfo.mintDecimalsA)
		console.log('Token B Decimals:', poolInfo.mintDecimalsB)
		console.log('Current Price (A/B):', currentPrice)
		console.log('Token A Price (USD):', tokenAPriceUsd)
		console.log('Token B Price (USD):', tokenBPriceUsd)
		console.log('\n--- Position Range ---')
		console.log('Price Lower:', priceLower.toString())
		console.log('Price Upper:', priceUpper.toString())
		console.log('\n--- Investment Details ---')
		console.log('Add USD Value:', addUsdValue)
		console.log('Base Token:', base)
		console.log('Base Amount (raw):', baseAmount.toString())
		console.log('Other Amount Max (raw):', otherAmountMax.toString())
		console.log('Token A Amount (UI):', uiAmountA.toString())
		console.log('Token B Amount (UI):', uiAmountB.toString())
		console.log(
			'Token A Value (USD):',
			(uiAmountA.toNumber() * tokenAPriceUsd).toFixed(2)
		)
		console.log(
			'Token B Value (USD):',
			(uiAmountB.toNumber() * tokenBPriceUsd).toFixed(2)
		)
		console.log('==========================================\n')

		// 从环境变量读取私钥
		const secretKey = process.env.SOL_SECRET_KEY
		if (!secretKey) {
			return NextResponse.json(
				{ error: 'SOL_SECRET_KEY not configured' },
				{ status: 500 }
			)
		}

		const userKeypair = Keypair.fromSecretKey(bs58.decode(secretKey))
		const userAddress = userKeypair.publicKey

		console.log('User Address:', userAddress.toBase58())
		console.log('\n--- Executing Transaction ---')
		console.log('Adding liquidity on-chain...')

		// 执行实际上链操作
		const signerCallback = async (tx: VersionedTransaction) => {
			tx.sign([userKeypair])
			return tx
		}

		const txid = await chain.addLiquidity({
			userAddress,
			nftMint,
			base,
			baseAmount,
			otherAmountMax,
			signerCallback,
		})

		console.log('Transaction ID:', txid)
		console.log('Liquidity added successfully!')
		console.log('==========================================\n')

		return NextResponse.json({
			success: true,
			txid,
			positionInfo: {
				nftMint: nftMint.toBase58(),
				poolAddress: poolInfo.poolId.toBase58(),
				priceLower: priceLower.toString(),
				priceUpper: priceUpper.toString(),
				base,
				baseAmount: baseAmount.toString(),
				otherAmountMax: otherAmountMax.toString(),
				tokenA: {
					address: poolInfo.mintA.toBase58(),
					amount: uiAmountA.toString(),
					valueUsd: (uiAmountA.toNumber() * tokenAPriceUsd).toFixed(2),
				},
				tokenB: {
					address: poolInfo.mintB.toBase58(),
					amount: uiAmountB.toString(),
					valueUsd: (uiAmountB.toNumber() * tokenBPriceUsd).toFixed(2),
				},
				userAddress: userAddress?.toBase58() || 'N/A',
			},
		})
	} catch (error: unknown) {
		console.error('Add Liquidity Error:', error)
		const errorMessage =
			error instanceof Error ? error.message : 'Failed to add liquidity'

		// 如果错误包含 "insufficient funds"，返回友好的余额不足提示
		if (errorMessage.includes('insufficient funds')) {
			return NextResponse.json({ error: '余额不足' }, { status: 400 })
		}

		return NextResponse.json({ error: errorMessage }, { status: 500 })
	}
}