import IIIFResource from './IIIFResource.js';

/**
 * @todo Move to common.js?!
 */
const splitter = {
    NIR: splitNIR,
    DN: splitDNO,
    DO: splitDNO,
    HSI: splitHSI
};

function splitNIR(filename) {
    let splitFilename = filename.split('_');
    const papyrusNumb = splitFilename[0].split('-')[2];
    const baseFolder = `PHerc_${papyrusNumb}`;
    const subfolder = `PHerc_${papyrusNumb}_${splitFilename[2].split('-')[0]}`;

    return {baseFolder, subfolder};
}
/**
 * @todo Redundant...
 */
function splitHSI(filename) {
    let splitFilename = filename.split('_');
    const papyrusNumb = splitFilename[0].split('-')[2];
    const baseFolder = `PHerc_${papyrusNumb}`;
    const subfolder = `PHerc_${papyrusNumb}_${splitFilename[2]}`;

    return {baseFolder, subfolder};
}

function splitDNO(filename) {
    let splitFilename = filename.split('_');
    const baseFolder = splitFilename.slice(0,2).join('_');
    const subfolder = splitFilename.slice(0,3).join('_');

    return {baseFolder, subfolder};
}

/**
 * @implements IIIFResource
 */
class Image {
    id = '';
    #context = `https://iiif.io/api/presentation/${process.env.IIIF_API_VERSION}/context.json`;
    #type = 'oa:Annotation';
    #motivation = 'sc:painting';
    #resType = 'dctypes:Image';
    #format = 'image/jpeg';
    height = 0;
    width = 0;
    service = {
        "@context" : this.#context,
        "@id" : '',
        profile : 'https://iiif.io/api/image/2/level2.json',
    };
    canvasId = '';
    /**
     * 
     * @param {string} canvasId The canvas IIIF id
     */
    constructor(canvasId) {
        this.canvasId = canvasId;
    }
    /**
     * @param {number} height 
     * @param {number} width 
     */
    setSize(height, width) {
        this.height = height;
        this.width = width;
    }
    /**
     * Generate IIIF id pointing to image
     * server endpoint for this image
     * @param {string} serviceURL The image server base URL
     * @param {string} filename The image's complete filename
     */
    generateID(serviceURL, filename) {
        let splitFn = splitter[/(NIR|DO|DN|HSI)/.exec(filename)[0]];

        const {baseFolder, subfolder} = splitFn(filename);

        this.id = `${serviceURL}/2/${baseFolder}%2F${subfolder}%2F${filename}/full/full/0/default.jpg`;
        this.service['@id'] = this.id.replace(/\/full.*$/,'');
    }
    /**
     * Object representation of this image
     * 
     * @returns {Object}
     */
    toObject() {
        return {
            "@context" : this.#context,
            "@type" : this.#type,
            motivation : this.#motivation,
            resource : {
                "@id" : this.id,
                "@type" : this.#resType,
                format: this.#format,
                service : this.service,
                height: this.height,
                width: this.width,
            },
            on : this.canvasId
        }
    }
}

export default Image;