import util from 'node:util';
import { PageSizes } from 'pdf-lib';

export type formatConfig = {
    /**
     * Page format - Letter, Legal, A4, etc
     */
    format?: string
};

export function parseFormat(cmdOptions: any, config: formatConfig): formatConfig {
    if (typeof cmdOptions.format !== 'undefined') {
        if (typeof cmdOptions.format === 'string') {
            if (!(cmdOptions.format in PageSizes)) {
                throw new Error(`Invalid --format value ${util.inspect(cmdOptions.format)}`);
            }
            config.format = cmdOptions.format;
        } else {
            throw new Error(`Invalid --format type ${util.inspect(cmdOptions.format)}`);
        }
    }
    return config;
}

export type rotateConfig = {
    rotate?: number;
};

export function parseRotate(cmdOptions: any, config: rotateConfig): rotateConfig {
    if (typeof cmdOptions.rotate !== 'undefined') {
        if (typeof cmdOptions.rotate === 'string') {
            if (cmdOptions.rotate === '0') {
                // no rotation
            } else if (cmdOptions.rotate === '90') {
                config.rotate = 90;
            } else if (cmdOptions.rotate === '180') {
                config.rotate = 180;
            } else if (cmdOptions.rotate === '270') {
                config.rotate = 270;
            } else {
                throw new Error(`Invalid --rotate value ${util.inspect(cmdOptions.rotate)}`);
            }
        } else {
            throw new Error(`Invalid --rotate type  ${util.inspect(cmdOptions.rotate)}`)
        }
    }
    return config;
}

/**
 * Container for the instructions to render one or more PDFs.
 * Normally this is generated by the `render` sub-command,
 * but could be generated by other code.
 */
export type renderConfig = {
    files: Array<{
        /**
         * VPath of the document file, meaning it is the
         * pathname within the virtual file system comprised
         * of the document directories.
         * 
         * Each vpath generates a PDF file.
         */
        vpath: string,

        /**
         * Object derived from YAML that is metadata to
         * be used for this document.
         */
        // metadata?: any,

        /**
         * Override the layout template for a specific file
         */
        // layout?: string,

        /**
         * Document files to be incorporated into
         * the document in vpath, and added to the PDF.
         *
         * This is a placeholder for if/when this feature
         * is implemented.
         */
        // attachments?: Array<{
        //     vpath: string,
        //     metadata: any
        // }>
    }>,

    /**
     * Page format - Letter, Legal, A4, etc
     */
    // format: string,

    /**
     * Directory where PDF files land
     */
    pdfOutput: string,

    /**
     * Directory where HTML/CSS/etc files land.  This is the
     * same as the AkashaCMS rendering output directory.
     */
    htmlOutput: string,

    /**
     * Enable/disable autoconversion of link-like text to a link.
     */
    linkify: boolean,

    /**
     * File name, referenced to root of project directory, of
     * the template for the PDF header
     */
    templateHeader: string,

    /**
     * Height, in pixels, of the header.  TBD is this to be a number?
     */
    heightHeader: string,

    /**
     * File name, referenced to root of project directory, of
     * the template for the PDF footer.
     */
    templateFooter: string,

    /**
     * Height, in pixels, of the footer.  TBD is this to be a number?
     */
    heightFooter: string,

    /**
     * Date to record as the publication date.
     * 
     * TODO make sure this becomes the creationDate metadata
     */
    publicationDate: Date,

    /**
     * Date to record as the modification date
     * 
     * TODO make sure this becomes the modificationDate metadata
     * 
     * TODO make sure there's a render option for this
     */
    modificationDate: Date,

    /**
     * Directory names where layout templates live.  This corresponds
     * to the AkashaCMS layoutDirs configuration setting.
     */
    layoutDirs?: Array<string>,

    /**
     * Directory names where asset files live. This corresponds
     * to the AkashaCMS assetDirs configuration setting.
     */
    assetDirs?: Array<string>

    /**
     * Directory names where partial templates live.  This corresponds
     * to the AkashaCMS partialDirs configuration setting.
     */
    partialDirs?: Array<string>,

    /**
     * Directory names where document files live.  This corresponds
     * to the AkashaCMS documentDirs configuration setting.
     */
    documentDirs?: Array<string>,

    /**
     * File name for a JavaScript module containing a Mahafunk array.
     * This will be plugged into the configuraion to support
     * custom processing of the documents.
     */
    funcs?: string,

    /**
     * Print extra information as the documents are processed.
     */
    verbose?: boolean,
}
& formatConfig
;