import { fetchFn } from '../client';
import {
  BridgeInitiateParams,
  BridgeQuoteParams,
  BridgeQuoteResult,
  BroadcastResult,
} from '../types';

/** Base URL for the Allbridge Core public API (supports Stacks via Core). */
const ALLBRIDGE_API = 'https://core.api.allbridgecoreapi.net';

/**
 * Get a cross-chain bridge quote.
 *
 * Uses the Allbridge Core public API to estimate the received amount for a
 * token bridged between two supported chains (including Stacks).
 */
export async function bridgeQuote(params: BridgeQuoteParams): Promise<BridgeQuoteResult> {
  const url =
    `${ALLBRIDGE_API}/swap?amount=${params.amount}` +
    `&fromChain=${encodeURIComponent(params.fromChain)}` +
    `&toChain=${encodeURIComponent(params.toChain)}` +
    `&token=${encodeURIComponent(params.token)}`;

  const res = await fetchFn(url);
  if (!res.ok) {
    throw new Error(
      `Failed to fetch bridge quote ${params.token} ${params.fromChain}->${params.toChain}: ` +
        `${res.status} ${res.statusText}`
    );
  }
  const json: any = await res.json();

  return {
    fromChain: params.fromChain,
    toChain: params.toChain,
    token: params.token,
    amountIn: String(params.amount),
    amountOut: String(json.amountOut ?? json.amount ?? '0'),
    fee: String(json.fee ?? json.bridgeFee ?? '0'),
    provider: 'allbridge-core',
  };
}

/**
 * Initiate a cross-chain bridge transfer.
 *
 * Bridge initiation requires a protocol-specific signed contract call on the
 * source chain (and, for Stacks, the Allbridge bridge contract). Because the
 * exact contract, function, and Clarity arguments depend on the live Allbridge
 * deployment and selected route, this is intentionally not auto-broadcast.
 * Use the generic `contractCall` tool with arguments derived from the quote, or
 * wire the Allbridge SDK for full execution.
 */
export async function bridgeInitiate(_params: BridgeInitiateParams): Promise<BroadcastResult> {
  throw new Error(
    'bridgeInitiate is not auto-executed. Fetch a quote with `bridgeQuote`, then ' +
      'build the source-chain bridge transaction with the `contractCall` tool ' +
      '(Stacks side) or the Allbridge SDK for non-Stacks source chains.'
  );
}