/** Same-origin in production (nginx /api/ → backend). Local dev uses localhost:3001. */
function apiUrl(path: string): string {
  const normalized = path.startsWith("/") ? path : `/${path}`;
  const configured = (process.env.NEXT_PUBLIC_API_URL ?? "").trim();

  if (typeof window !== "undefined") {
    // Ignore localhost baked in at build time — browser must hit same-origin /api/.
    if (configured && !/^https?:\/\/(localhost|127\.0\.0\.1)(:\d+)?/i.test(configured)) {
      return `${configured.replace(/\/$/, "")}${normalized}`;
    }
    return normalized;
  }

  if (configured) {
    return `${configured.replace(/\/$/, "")}${normalized}`;
  }
  if (process.env.NODE_ENV === "production") {
    return normalized;
  }
  return `http://localhost:3001${normalized}`;
}

export interface TreasuryRecord {
  id: string;
  organizationId: string;
  chainId: number;
  mainWallet: string;
  label: string | null;
  createdAt: string;
  updatedAt: string;
}

export interface TransactionRecord {
  id: string;
  treasuryId: string;
  proposalId: number;
  walletAddress: string;
  to: string;
  value: string;
  token: string | null;
  data: string | null;
  status: string;
  proposer: string;
  createdAt: string;
  executedAt: string | null;
  approvalCount?: number;
}

export interface SubAccountRecord {
  id: string;
  treasuryId: string;
  address: string;
  label: string | null;
  metadataHash: string | null;
  createdAt: string;
}

export interface LedgerEntry {
  id: string;
  kind: "deposit" | "transfer_out";
  txHash: string;
  from: string;
  to: string;
  value: string;
  token: string | null;
  tokenSymbol: string | null;
  timestamp: string;
  blockNumber: number;
}

async function signedHeaders(path: string, wallet?: string, method = "GET"): Promise<Record<string, string> | undefined> {
  if (!wallet || typeof window === "undefined") return undefined;
  const ethereum = (window as Window & { ethereum?: { request: (args: { method: string; params: string[] }) => Promise<string> } }).ethereum;
  if (!ethereum) return undefined;
  const domain = window.location.host;
  const nonce = crypto.randomUUID();
  const message = `Solace Treasury API authorization\nDomain: ${domain}\nChain ID: 138\nWallet: ${wallet.toLowerCase()}\nMethod: ${method}\nPath: ${path}\nTimestamp: ${Date.now()}\nNonce: ${nonce}`;
  const signature = await ethereum.request({ method: "personal_sign", params: [message, wallet] });
  return { "X-Wallet-Address": wallet, "X-Wallet-Message": message, "X-Wallet-Signature": signature };
}

async function apiFetch<T>(path: string, wallet?: string): Promise<T> {
  const res = await fetch(apiUrl(path), { cache: "no-store", headers: await signedHeaders(path, wallet) });
  if (!res.ok) {
    throw new Error(`API ${path} failed: ${res.status}`);
  }
  return res.json() as Promise<T>;
}

export async function fetchTreasury(wallet: string): Promise<TreasuryRecord | null> {
  const data = await apiFetch<{ treasury: TreasuryRecord | null }>(
    `/api/treasury?wallet=${encodeURIComponent(wallet)}`
  );
  return data.treasury;
}

export async function fetchTransactions(
  treasuryId: string,
  status?: string,
  wallet?: string
): Promise<TransactionRecord[]> {
  const query = status ? `?status=${encodeURIComponent(status)}` : "";
  const data = await apiFetch<{ proposals: TransactionRecord[] }>(
    `/api/transactions/${treasuryId}${query}`, wallet
  );
  return data.proposals;
}

export async function fetchPendingProposals(treasuryId: string, wallet?: string): Promise<TransactionRecord[]> {
  const data = await apiFetch<{ proposals: TransactionRecord[] }>(
    `/api/proposals/${treasuryId}?status=pending&includeApprovals=1`, wallet
  );
  return data.proposals;
}

export async function fetchSubAccounts(treasuryId: string, wallet?: string): Promise<SubAccountRecord[]> {
  const data = await apiFetch<{ subAccounts: SubAccountRecord[] }>(
    `/api/treasury/${treasuryId}/sub-accounts`, wallet
  );
  return data.subAccounts;
}

export async function fetchLedger(treasuryId: string, wallet?: string): Promise<LedgerEntry[]> {
  const data = await apiFetch<{ ledger: LedgerEntry[] }>(
    `/api/treasury/${treasuryId}/ledger`, wallet
  );
  return data.ledger;
}

export async function fetchLedgerByWallet(wallet: string): Promise<LedgerEntry[]> {
  const data = await apiFetch<{ ledger: LedgerEntry[] }>(
    `/api/ledger?wallet=${encodeURIComponent(wallet)}`, wallet
  );
  return data.ledger;
}

export async function exportTransactionsCsv(treasuryId: string, wallet?: string): Promise<string> {
  const path = `/api/transactions/export?treasuryId=${encodeURIComponent(treasuryId)}&format=csv`;
  const res = await fetch(
    apiUrl(path), { headers: await signedHeaders(path, wallet) }
  );
  if (!res.ok) {
    throw new Error(`CSV export failed: ${res.status}`);
  }
  return res.text();
}