import type { Tensor } from "openvino-node";
import type { ChatHistory } from "./chatHistory.js";
/**
 * TokenizedInputs contains input_ids, attention_mask and (optionally) token_type_ids tensors.
 * token_type_ids is returned if the tokenizer supports paired input, otherwise the field is undefined.
 * This is the result of encoding prompts using the Tokenizer.
 */
export interface TokenizedInputs {
    /** Tensor containing token IDs of the encoded input */
    input_ids: Tensor;
    /** Tensor containing attention mask (1 for real tokens, 0 for padding) */
    attention_mask: Tensor;
    /**
     * Optional tensor with token type IDs (segment ids) for paired inputs.
     * Present only if the model/tokenizer supports paired input.
     */
    token_type_ids?: Tensor;
}
/**
 * Options for encode method.
 */
export interface EncodeOptions {
    /**
     * Whether to add special tokens like BOS, EOS, PAD.
     * @defaultValue true
     */
    add_special_tokens?: boolean;
    /**
     * Whether to pad the sequence to the maximum length.
     * @defaultValue false
     */
    pad_to_max_length?: boolean;
    /**
     * Maximum length of the sequence.
     * If undefined, the value will be taken from the IR.
     */
    max_length?: number;
    /**
     * Side to pad the sequence, can be 'left' or 'right'.
     * If undefined, the value will be taken from the IR.
     */
    padding_side?: "left" | "right";
}
/**
 * Options for decode method.
 */
export interface DecodeOptions {
    /**
     * Whether to skip special tokens like BOS, EOS, PAD during detokenization.
     * @defaultValue true
     */
    skip_special_tokens?: boolean;
}
/**
 * The Tokenizer class is used to encode prompts and decode resulting tokens.
 *
 * Chat template is initialized from sources in the following order, overriding the previous value:
 * 1. chat_template entry from tokenizer_config.json
 * 2. chat_template entry from processor_config.json
 * 3. chat_template entry from chat_template.json
 * 4. chat_template entry from rt_info section of openvino.Model
 * 5. If the template is known to be not supported by GenAI, it's replaced with a simplified supported version.
 */
export interface Tokenizer {
    /**
     * Load tokenizer and detokenizer IRs by path.
     * @param tokenizerPath Path to a directory containing tokenizer/detokenizer XML/BIN files.
     * @param properties Optional OpenVINO compilation properties.
     */
    new (tokenizerPath: string, properties?: Record<string, unknown>): Tokenizer;
    /**
     * Create tokenizer from already loaded IR contents.
     * @param tokenizerModel Tokenizer XML string.
     * @param tokenizerWeights Tokenizer weights tensor.
     * @param detokenizerModel Detokenizer XML string.
     * @param detokenizerWeights Detokenizer weights tensor.
     * @param properties Optional OpenVINO compilation properties.
     */
    new (tokenizerModel: string, tokenizerWeights: Tensor, detokenizerModel: string, detokenizerWeights: Tensor, properties?: Record<string, unknown>): Tokenizer;
    /**
     * Applies a chat template to format chat history into a prompt string.
     * @param chatHistory - chat history as an array of message objects or ChatHistory instance
     * @param addGenerationPrompt - whether to add a generation prompt at the end
     * @param chatTemplate - optional custom chat template to use instead of the default
     * @param tools - optional array of tool definitions for function calling
     * @param extraContext - optional extra context object for custom template variables
     * @returns formatted prompt string
     */
    applyChatTemplate(chatHistory: Record<string, unknown>[] | ChatHistory, addGenerationPrompt: boolean, chatTemplate?: string, tools?: Record<string, unknown>[], extraContext?: Record<string, unknown>): string;
    /**
     * Encodes a single prompt or a list of prompts into tokenized inputs.
     * @param prompts - single prompt string or array of prompts
     * @param options - encoding options
     * @returns TokenizedInputs object containing input_ids, attention_mask and optional token_type_ids tensors.
     */
    encode(prompts: string | string[], options?: EncodeOptions): TokenizedInputs;
    /**
     * Encodes two lists of prompts into tokenized inputs (for paired input).
     * The number of strings must be the same, or one of the inputs can contain one string.
     * In the latter case, the single-string input will be broadcast into the shape of the other input,
     * which is more efficient than repeating the string in pairs.
     * @param prompts1 - first list of prompts to encode
     * @param prompts2 - second list of prompts to encode
     * @param options - encoding options
     * @returns TokenizedInputs object containing input_ids, attention_mask and optional token_type_ids tensors.
     */
    encode(prompts1: string[], prompts2: string[], options?: EncodeOptions): TokenizedInputs;
    /**
     * Encodes a list of paired prompts into tokenized inputs.
     * Input format is same as for HF paired input [[prompt_1, prompt_2], ...].
     * @param prompts - list of paired prompts to encode
     * @param options - encoding options
     * @returns TokenizedInputs object containing input_ids, attention_mask and optional token_type_ids tensors.
     */
    encode(prompts: [string, string][], options?: EncodeOptions): TokenizedInputs;
    /**
     * Decode a sequence of token IDs into a string prompt.
     *
     * @param tokens - sequence of token IDs to decode
     * @param options - decoding options
     * @returns decoded string.
     */
    decode(tokens: number[] | bigint[], options?: DecodeOptions): string;
    /**
     * Decode a batch of token sequences (as Tensor or array of arrays) into a list of string prompts.
     *
     * @param tokens - tensor containing token IDs or batch of token ID sequences
     * @param options - decoding options
     * @returns list of decoded strings.
     */
    decode(tokens: Tensor | number[][] | bigint[][], options?: DecodeOptions): string[];
    /**
     * Returns the BOS (Beginning of Sequence) token string.
     * @returns BOS token string
     */
    getBosToken(): string;
    /**
     * Returns the BOS (Beginning of Sequence) token ID.
     * @returns BOS token ID
     */
    getBosTokenId(): bigint;
    /**
     * Returns the EOS (End of Sequence) token string.
     * @returns EOS token string
     */
    getEosToken(): string;
    /**
     * Returns the EOS (End of Sequence) token ID.
     * @returns EOS token ID
     */
    getEosTokenId(): bigint;
    /**
     * Returns the PAD (Padding) token string.
     * @returns PAD token string
     */
    getPadToken(): string;
    /**
     * Returns the PAD (Padding) token ID.
     * @returns PAD token ID
     */
    getPadTokenId(): bigint;
    /**
     * Returns the current chat template string.
     * @returns current chat template string
     */
    getChatTemplate(): string;
    /**
     * Returns the original chat template from the tokenizer configuration.
     * @returns original chat template string
     */
    getOriginalChatTemplate(): string;
    /**
     * Override a chat template read from tokenizer_config.json.
     * @param chatTemplate - custom chat template string to use
     */
    setChatTemplate(chatTemplate: string): void;
    /**
     * Returns true if the tokenizer supports paired input, false otherwise.
     * @returns whether the tokenizer supports paired input
     */
    supportsPairedInput(): boolean;
    /**
     * The current chat template string.
     * Can be used to get or set the chat template.
     */
    chatTemplate: string;
}