interface AstralSDKConfig {
  chainId: number;                // Target chain ID (e.g., 84532 for Base Sepolia)
  apiUrl?: string;                // API base URL (default: https://staging-api.astral.global)
  signer?: ethers.Signer;        // Ethers signer for onchain submissions
}

/** GeoJSON geometry */
type GeoJSONInput = {
  type: 'Point' | 'LineString' | 'Polygon' | 'MultiPoint' | 'MultiLineString' | 'MultiPolygon';
  coordinates: number[] | number[][] | number[][][] | number[][][][];
};

/** Onchain attestation UID */
type UIDInput = string;   // "0x..."

/** Offchain attestation reference */
type OffchainInput = {
  uid: string;
  uri: string;            // IPFS or HTTP URI
};

/** Inline attestation object */
type InlineAttestationInput = {
  attestation: {
    uid: string;
    schema: string;
    data: string;
  };
};

type Input = GeoJSONInput | UIDInput | OffchainInput | InlineAttestationInput;

interface DistanceRequest {
  from: Input;
  to: Input;
  chainId: number;
  schema?: string;
  recipient?: string;
}

interface AreaRequest {
  geometry: Input;
  chainId: number;
  schema?: string;
  recipient?: string;
}

interface LengthRequest {
  geometry: Input;
  chainId: number;
  schema?: string;
  recipient?: string;
}

interface ContainsRequest {
  container: Input;
  geometry: Input;
  chainId: number;
  schema?: string;
  recipient?: string;
}

interface WithinRequest {
  geometry: Input;
  target: Input;
  radius: number;         // meters
  chainId: number;
  schema?: string;
  recipient?: string;
}

interface IntersectsRequest {
  geometry1: Input;
  geometry2: Input;
  chainId: number;
  schema?: string;
  recipient?: string;
}

interface ComputeResult<T = number | boolean> {
  result: T;
  operation: string;
  units?: string;                 // "meters" | "square_meters"
  timestamp: number;
  inputRefs: string[];
  attestation: AttestationData;
  delegatedAttestation: DelegatedAttestationData;
}

interface AttestationData {
  schema: string;
  attester: string;
  recipient: string;
  data: string;                   // ABI-encoded
  signature: string;
}

interface DelegatedAttestationData {
  signature: string;
  attester: string;
  deadline: number;               // Unix timestamp
}

interface SubmitDelegatedOptions {
  signature: string;
  attester: string;
  schema: string;
  data: string;
  recipient: string;
  deadline: number;
}

interface SubmitResult {
  hash: string;                   // Transaction hash
  uid: string;                    // Attestation UID
}