import {
	type Connection,
	PublicKey,
	Transaction,
	type TransactionInstruction,
	SystemProgram,
	LAMPORTS_PER_SOL,
} from "@solana/web3.js";

export interface SwapParams {
	fromToken: string;
	toToken: string;
	amount: number;
	slippage: number;
	swapMode?: "ExactIn" | "ExactOut";
}

export async function executeSwap(
	connection: Connection,
	walletPubkey: PublicKey,
	params: SwapParams,
): Promise<{ signature: string }> {
	// Create transaction
	const tx = new Transaction();

	// Add swap instruction
	const swapIx = await createSwapInstruction(connection, walletPubkey, params);
	tx.add(swapIx);

	// Get recent blockhash
	const { blockhash } = await connection.getRecentBlockhash();
	tx.recentBlockhash = blockhash;
	tx.feePayer = walletPubkey;

	// Send and confirm transaction
	const signature = await connection.sendTransaction(tx, []);
	await connection.confirmTransaction(signature);

	return { signature };
}

export async function createSwapInstruction(
	_connection: Connection,
	walletPubkey: PublicKey,
	params: SwapParams,
): Promise<TransactionInstruction> {
	// For now, just create a simple SOL transfer instruction
	return SystemProgram.transfer({
		fromPubkey: walletPubkey,
		toPubkey: new PublicKey(params.toToken),
		lamports: params.amount * LAMPORTS_PER_SOL,
	});
}

export async function getTokenAccount(
	_connection: Connection,
	walletPubkey: PublicKey,
	_mint: PublicKey,
): Promise<PublicKey> {
	// For SOL transfers, just return the wallet pubkey
	return walletPubkey;
}