/**
 * @fileOverview Uyghur(V4.0)Dual keyboard driver.
 * @author <a href="mailto:drachels@drachels.com">AL Rachels</a>
 * @version 4.0
 * @since 04/01/2016
 */

/**
 * Check for combined character.
 * @param {string} chr The combined character.
 * @returns {string} The character.
 */
function isCombined(chr) {
    return false;
}

/**
 * Process keyup for combined character.
 * @param {string} e The combined character.
 * @returns {bolean} The result.
 */
function keyupCombined(e) {
    return false;
}

/**
 * Process keyupFirst.
 * @param {string} event Type of event.
 * @returns {bolean} The event.
 */
function keyupFirst(event) {
    return false;
}

/**
 * Check for character typed so flags can be set.
 * @param {string} ltr The current letter.
 */
function keyboardElement(ltr) {
    this.chr = ltr.toUpperCase();
    this.alt = false;

    // Phpcs:ignore
    if (ltr.match(/[~!@#$%^&*()_+»«|ژفگخجۆلا:"<>؟]/i)) {
        this.shift = true;
    } else {
        this.shift = false;
    }
    // Set flags for characters needing Alt Gr key.
    // phpcs:ignore
    if (ltr.match(/[ال]/i)) {
        this.shift = false;
    }

    this.turnOn = function() {
        if (isLetter(this.chr)) {
            document.getElementById(getKeyID(this.chr)).className = "next" + thenFinger(this.chr.toUpperCase());
        } else if (this.chr === ' ') {
            document.getElementById(getKeyID(this.chr)).className = "nextSpace";
        } else {
            document.getElementById(getKeyID(this.chr)).className = "next" + thenFinger(this.chr.toUpperCase());
        }
        if (this.chr === '\n' || this.chr === '\r\n' || this.chr === '\n\r' || this.chr === '\r') {
            document.getElementById('jkeyenter').className = "next4";
        }
        if (this.shift) {
            document.getElementById('jkeyshiftd').className = "next4";
            document.getElementById('jkeyshiftl').className = "next4";
        }
        if (this.alt) {
            document.getElementById('jkeyaltgr').className = "nextSpace";
        }
    };
    this.turnOff = function() {
        if (isLetter(this.chr)) {
        // Phpcs:ignore
            if (this.chr.match(/[فھسداقكل؛ף]/i)) {
                document.getElementById(getKeyID(this.chr)).className = "finger" + thenFinger(this.chr.toUpperCase());
            } else {
                document.getElementById(getKeyID(this.chr)).className = "normal";
            }
        } else {
            document.getElementById(getKeyID(this.chr)).className = "normal";
        }
        if (this.chr === '\n' || this.chr === '\r\n' || this.chr === '\n\r' || this.chr === '\r') {
            document.getElementById('jkeyenter').classname = "normal";
        }
        if (this.shift) {
            document.getElementById('jkeyshiftd').className = "normal";
            document.getElementById('jkeyshiftl').className = "normal";
        }
        if (this.alt) {
            document.getElementById('jkeyaltgr').className = "normal";
        }
    };
}

/**
 * Set color flag based on current character.
 * @param {string} tCrka The current character.
 * @returns {number}.
 */
function thenFinger(tCrka) {
    if (tCrka === ' ') {
        return 5; // Highlight the spacebar.
    // phpcs:ignore
    } else if (tCrka.match(/[`~1!چھز0پ؛:ئ؟\-_\]»«'"=+[«\\|(]/i)) {
        return 4; // Highlight the correct key above in red.
    // phpcs:ignore
    } else if (tCrka.match(/[2@ۋسش9)ول.<]/i)) {
        return 3; // Highlight the correct key above in green.
    // phpcs:ignore
    } else if (tCrka.match(/[3#ېدژغ8*ڭكۆ،>]/i)) {
        return 2; // Highlight the correct key above in yellow.
    // phpcs:ignore
    } else if (tCrka.match(/[4$رافۈ5%تەگب6^يىخن7&ۇقجم]/i)) {
        return 1; // Highlight the correct key above in blue.
    } else {
        return 6; // Do not change any highlight.
    }
}

/**
 * Get ID of key to highlight based on current character.
 * @param {string} tCrka The current character.
 * @returns {string}.
 */
function getKeyID(tCrka) {
    if (tCrka === ' ') {
        return "jkeyspace";
    } else if (tCrka === '\n') {
        return "jkeyenter";
    } else if (tCrka === '`' || tCrka === '~') {
        return "jkey`";
    } else if (tCrka === '!') {
        return "jkey1";
    } else if (tCrka === '@') {
        return "jkey2";
    } else if (tCrka === '#') {
        return "jkey3";
    } else if (tCrka === '$') {
        return "jkey4";
    } else if (tCrka === '%') {
        return "jkey5";
    } else if (tCrka === '^') {
        return "jkey6";
    } else if (tCrka === '&') {
        return "jkey7";
    } else if (tCrka === '*') {
        return "jkey8";
    } else if (tCrka === ')') {
        return "jkey9";
    } else if (tCrka === '(') {
        return "jkey0";
    } else if (tCrka === '-' || tCrka === '_') {
        return "jkey-";
    } else if (tCrka === '=' || tCrka === '+') {
        return "jkey=";
    } else if (tCrka === "\\" || tCrka === '|') {
        return "jkeybackslash";
    } else if (tCrka === ']' || tCrka === '»') {
        return "jkey]";
    } else if (tCrka === '[' || tCrka === '«') {
        return "jkey[";
    } else if (tCrka === 'ژ') {
        return "jkeyد"; // D.
    } else if (tCrka === 'ف' || tCrka === 'ا') {
        return "jkeyf"; // F.
    } else if (tCrka === 'گ') {
        return "jkeyە"; // G.
    } else if (tCrka === 'خ') {
        return "jkeyى"; // H.
    } else if (tCrka === 'ج') {
        return "jkeyق"; // J.
    } else if (tCrka === 'ۆ') {
        return "jkeyك"; // K.
    } else if (tCrka === 'لا' || tCrka === 'ل') {
        return "jkeyl"; // L.
    } else if (tCrka === ':') {
        return "jkey؛";
    } else if (tCrka === '"') {
        return "jkey'";
    } else if (tCrka === '>') {
        return "jkey،";
    } else if (tCrka === '<') {
        return "jkey.";
    } else if (tCrka === '؟') {
        return "jkeyئ";
    } else {
        return "jkey" + tCrka;
    }
}

/**
 * Is the typed letter part of the current alphabet.
 * @param {string} str The current letter.
 * @returns {(number|Array)}.
 */
function isLetter(str) {
    return str.length === 1 && str.match(/[!-ﻼ]/i);
}
