/**
 * @author n1474335 [n1474335@gmail.com]
 * @copyright Crown Copyright 2016
 * @license Apache-2.0
 */

import Operation from "../Operation";
import {toHex, TO_HEX_DELIM_OPTIONS} from "../lib/Hex";
import Utils from "../Utils";

/**
 * To Hex operation
 */
class ToHex extends Operation {

    /**
     * ToHex constructor
     */
    constructor() {
        super();

        this.name = "To Hex";
        this.module = "Default";
        this.description = "Converts the input string to hexadecimal bytes separated by the specified delimiter.<br><br>e.g. The UTF-8 encoded string <code>Γειά σου</code> becomes <code>ce 93 ce b5 ce b9 ce ac 20 cf 83 ce bf cf 85 0a</code>";
        this.infoURL = "https://wikipedia.org/wiki/Hexadecimal";
        this.inputType = "ArrayBuffer";
        this.outputType = "string";
        this.args = [
            {
                name: "Delimiter",
                type: "option",
                value: TO_HEX_DELIM_OPTIONS
            }
        ];
    }

    /**
     * @param {ArrayBuffer} input
     * @param {Object[]} args
     * @returns {string}
     */
    run(input, args) {
        const delim = Utils.charRep(args[0] || "Space");
        return toHex(new Uint8Array(input), delim, 2);
    }

    /**
     * Highlight to Hex
     *
     * @param {Object[]} pos
     * @param {number} pos[].start
     * @param {number} pos[].end
     * @param {Object[]} args
     * @returns {Object[]} pos
     */
    highlight(pos, args) {
        const delim = Utils.charRep(args[0] || "Space"),
            len = delim === "\r\n" ? 1 : delim.length;

        pos[0].start = pos[0].start * (2 + len);
        pos[0].end = pos[0].end * (2 + len) - len;

        // 0x and \x are added to the beginning if they are selected, so increment the positions accordingly
        if (delim === "0x" || delim === "\\x") {
            pos[0].start += 2;
            pos[0].end += 2;
        }
        return pos;
    }

    /**
     * Highlight from Hex
     *
     * @param {Object[]} pos
     * @param {number} pos[].start
     * @param {number} pos[].end
     * @param {Object[]} args
     * @returns {Object[]} pos
     */
    highlightReverse(pos, args) {
        const delim = Utils.charRep(args[0] || "Space"),
            len = delim === "\r\n" ? 1 : delim.length,
            width = len + 2;

        // 0x and \x are added to the beginning if they are selected, so increment the positions accordingly
        if (delim === "0x" || delim === "\\x") {
            if (pos[0].start > 1) pos[0].start -= 2;
            else pos[0].start = 0;
            if (pos[0].end > 1) pos[0].end -= 2;
            else pos[0].end = 0;
        }

        pos[0].start = pos[0].start === 0 ? 0 : Math.round(pos[0].start / width);
        pos[0].end = pos[0].end === 0 ? 0 : Math.ceil(pos[0].end / width);
        return pos;
    }
}

export default ToHex;
