/**
 * @deprecated
 * Formats a document using a given prompt template.
 *
 * @async
 * @param {Document} document - The document to format.
 * @param {BasePromptTemplate} prompt - The prompt template to use for formatting.
 * @returns {Promise<string>} A Promise that resolves to the formatted document as a string.
 * @throws {Error} If the document is missing required metadata variables specified in the prompt template.
 */
export const formatDocument = async (document, prompt) => {
    const baseInfo = {
        pageContent: document.pageContent,
        ...document.metadata,
    };
    const variables = new Set(prompt.inputVariables);
    const requiredMetadata = new Set(prompt.inputVariables
        .map((v) => (v !== "pageContent" ? v : null))
        .filter((v) => v !== null));
    const missingMetadata = [];
    for (const variable of variables) {
        if (!(variable in baseInfo) && variable !== "pageContent") {
            missingMetadata.push(variable);
        }
    }
    if (missingMetadata.length) {
        throw new Error(`Document prompt requires documents to have metadata variables: ${JSON.stringify(requiredMetadata)}. Received document with missing metadata: ${JSON.stringify(missingMetadata)}`);
    }
    return prompt.format(baseInfo);
};