import crypto from 'crypto';
import { Readable, Writable } from 'stream';
import { CoerceToUint8ArrayInput } from '@alessiofrittoli/crypto-buffer';

/**
 * Cipher types.
 */
declare namespace Cph {
    /** Cipher CBC algorithm types. */
    type CBCTypes = 'aes-128-cbc' | 'aes-192-cbc' | 'aes-256-cbc';
    /** Cipher supported algorithm types. */
    type AesAlgorithm = (crypto.CipherCCMTypes | crypto.CipherGCMTypes | crypto.CipherOCBTypes | Cph.CBCTypes | crypto.CipherChaCha20Poly1305Types);
    /**
     * Common Cipher options.
     * @template T The AES algorithm type.
     */
    interface Options<T extends Cph.AesAlgorithm = Cph.AesAlgorithm> {
        /** The Cipher algorithm to use. Default: `aes-256-gcm` | `aes-256-cbc`. */
        algorithm?: T;
        /** The salt length. Minimum: `16`, Maximum: `64`. Default: `32`. */
        salt?: number;
        /** The `IV` length. Minimum: `8`, Maximum: `32`. Default: `16`. */
        iv?: number;
        /** The `authTag` length. Minimum: `4`, Maximum: `16`. Default: `16`. */
        authTag?: number;
        /** Custom `Additional Authenticated Data`. */
        aad?: CoerceToUint8ArrayInput;
        /** The `AAD` length. Minimum: `16`, Maximum: `128`. Default: `32`. */
        aadLength?: number;
    }
    /**
     * Resolved Common options.
     */
    interface ResolvedOptions<T extends Cph.AesAlgorithm = Cph.AesAlgorithm> extends Required<Omit<Cph.Options<T>, 'aad'>> {
        /** The symmetric key length. */
        length: number;
        aad?: Uint8Array;
    }
    namespace Stream {
        namespace Symmetric {
            /**
             * Options for encrypting a stream.
             */
            interface EncryptOptions extends Cph.Options<Cph.CBCTypes> {
                /** The `Readable` Stream from where raw data to encrypt is read. */
                input: Readable;
                /** The `Writable` Stream where encrypted data is written. */
                output: Writable;
            }
            /**
             * Resolved Stream Encrypt options (symmetric and hybrid).
             */
            type EncryptResolvedOptions = (Cph.ResolvedOptions & Required<Cph.Stream.Symmetric.EncryptOptions>);
            /**
             * Returnign object from `Cipher.encryptStream()` method.
             */
            interface EncryptReturnType {
                /** The `crypto.Cipher` instance. */
                cipher: crypto.Cipher;
                /** The actual `encrypt` callback that must be called and awaited in order to start the encryption process. */
                encrypt: () => Promise<void>;
            }
            /**
             * Options for decrypting a stream (symmetric).
             */
            interface DecryptOptions extends Cph.Stream.Symmetric.EncryptOptions {
                /** The `Readable` Stream from where encrypted data is read. */
                input: Readable;
                /** The `Writable` Stream where decrypted data is written. */
                output: Writable;
            }
            /**
             * Resolved Stream Decrypt options (symmetric).
             */
            type DecryptResolvedOptions = (Cph.ResolvedOptions & Required<Cph.Stream.Symmetric.DecryptOptions>);
            interface DecryptReturnType {
                /** The `crypto.Decipher` instance. */
                decipher: crypto.Decipher;
                /** The actual `decrypt` callback that must be called and awaited in order to start the decryption process. */
                decrypt: () => Promise<void>;
            }
        }
        namespace Hybrid {
            /**
             * Alias for {@link Cph.Stream.Symmetric.EncryptOptions}
             */
            type EncryptOptions = Cph.Stream.Symmetric.EncryptOptions;
            /**
             * Alias for {@link Cph.Stream.Symmetric.EncryptResolvedOptions}
             */
            type EncryptResolvedOptions = Cph.Stream.Symmetric.EncryptResolvedOptions;
            /**
             * Options for decrypting a stream.
             */
            interface DecryptOptions extends Cph.Stream.Symmetric.DecryptOptions {
                /** The RSA key length in bytes used while encrypting data. This is used to properly extract the encrypted Cipher Key and Initialization Vector. */
                rsaKeyLength: number;
            }
            /**
             * Resolved Stream Decrypt options.
             */
            type DecryptResolvedOptions = (Cph.ResolvedOptions & Required<Cph.Stream.Hybrid.DecryptOptions>);
            /**
             * Alias for {@link Cph.Stream.Symmetric.EncryptReturnType}
             */
            type EncryptReturnType = Cph.Stream.Symmetric.EncryptReturnType;
            /**
             * Alias for {@link Cph.Stream.Symmetric.DecryptReturnType}
             */
            type DecryptReturnType = Cph.Stream.Symmetric.DecryptReturnType;
        }
    }
}

export { Cph };