/**
 *    MEDDLE version 0.9
 *    Copyright (C) 2017 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

function trim(str)
{
    return str.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
}


// Ligature lookup info:
//   https://en.wikipedia.org/wiki/List_of_precomposed_Latin_characters_in_Unicode
//   https://en.wikipedia.org/wiki/Typographic_ligature#Ligatures_in_Unicode_.28Latin_alphabets.29


var ligature_map = {
    
    "\uA732": "AA" ,
    "\uA733": "aa" ,
    "\u00C6": "AE" ,
    "\u00E6": "ae" ,
    "\uA734": "AO" ,
    "\uA735": "ao" ,
    "\uA736": "AU" ,
    "\uA737": "au" ,
    "\uA738": "AV" ,
    "\uA739": "av" ,
    // as above but with bar
    "\uA73A": "AV" ,
    "\uA73B": "av" ,
    "\uA73C": "AY" ,
    "\uA73D": "ay" ,
    "\u1F670": "et" ,
    "\uFB00": "ff" ,
    "\uFB03": "ffi" ,
    "\uFB04": "ffl" ,
    "\uFB01": "fi" ,
    "\uFB02": "fl" ,
    "\u0152": "OE" ,
    "\u0153": "oe" ,
    "\uA74E": "OO" ,
    "\uA74F": "oo" ,
    "\u00DF": "ſs" ,
    "\u00DF": "ſz" ,
    "\uFB06": "st" ,
    "\uFB05": "ſt" ,
    "\uA728": "TZ" ,
    "\uA729": "tz" ,
    "\u1D6B": "ue" ,
    "\uAB50": "ui" ,
    "\uA760": "VY" ,
    "\uA761": "vy"
};

var ligature_re = null;

var accented = {
    'a': '[Aa\xaa\xc0-\xc5\xe0-\xe5\u0100-\u0105\u01cd\u01ce\u0200-\u0203\u0226\u0227\u1d2c\u1d43\u1e00\u1e01\u1e9a\u1ea0-\u1ea3\u2090\u2100\u2101\u213b\u249c\u24b6\u24d0\u3371-\u3374\u3380-\u3384\u3388\u3389\u33a9-\u33af\u33c2\u33ca\u33df\u33ff\uff21\uff41]',
    'b': '[Bb\u1d2e\u1d47\u1e02-\u1e07\u212c\u249d\u24b7\u24d1\u3374\u3385-\u3387\u33c3\u33c8\u33d4\u33dd\uff22\uff42]',
    'c': '[Cc\xc7\xe7\u0106-\u010d\u1d9c\u2100\u2102\u2103\u2105\u2106\u212d\u216d\u217d\u249e\u24b8\u24d2\u3376\u3388\u3389\u339d\u33a0\u33a4\u33c4-\u33c7\uff23\uff43]',
    'd': '[Dd\u010e\u010f\u01c4-\u01c6\u01f1-\u01f3\u1d30\u1d48\u1e0a-\u1e13\u2145\u2146\u216e\u217e\u249f\u24b9\u24d3\u32cf\u3372\u3377-\u3379\u3397\u33ad-\u33af\u33c5\u33c8\uff24\uff44]',
    'e': '[Ee\xc8-\xcb\xe8-\xeb\u0112-\u011b\u0204-\u0207\u0228\u0229\u1d31\u1d49\u1e18-\u1e1b\u1eb8-\u1ebd\u2091\u2121\u212f\u2130\u2147\u24a0\u24ba\u24d4\u3250\u32cd\u32ce\uff25\uff45]',
    'f': '[Ff\u1da0\u1e1e\u1e1f\u2109\u2131\u213b\u24a1\u24bb\u24d5\u338a-\u338c\u3399\ufb00-\ufb04\uff26\uff46]',
    'g': '[Gg\u011c-\u0123\u01e6\u01e7\u01f4\u01f5\u1d33\u1d4d\u1e20\u1e21\u210a\u24a2\u24bc\u24d6\u32cc\u32cd\u3387\u338d-\u338f\u3393\u33ac\u33c6\u33c9\u33d2\u33ff\uff27\uff47]',
    'h': '[Hh\u0124\u0125\u021e\u021f\u02b0\u1d34\u1e22-\u1e2b\u1e96\u210b-\u210e\u24a3\u24bd\u24d7\u32cc\u3371\u3390-\u3394\u33ca\u33cb\u33d7\uff28\uff48]',
    'i': '[Ii\xcc-\xcf\xec-\xef\u0128-\u0130\u0132\u0133\u01cf\u01d0\u0208-\u020b\u1d35\u1d62\u1e2c\u1e2d\u1ec8-\u1ecb\u2071\u2110\u2111\u2139\u2148\u2160-\u2163\u2165-\u2168\u216a\u216b\u2170-\u2173\u2175-\u2178\u217a\u217b\u24a4\u24be\u24d8\u337a\u33cc\u33d5\ufb01\ufb03\uff29\uff49]',
    'j': '[Jj\u0132-\u0135\u01c7-\u01cc\u01f0\u02b2\u1d36\u2149\u24a5\u24bf\u24d9\u2c7c\uff2a\uff4a]',
    'k': '[Kk\u0136\u0137\u01e8\u01e9\u1d37\u1d4f\u1e30-\u1e35\u212a\u24a6\u24c0\u24da\u3384\u3385\u3389\u338f\u3391\u3398\u339e\u33a2\u33a6\u33aa\u33b8\u33be\u33c0\u33c6\u33cd-\u33cf\uff2b\uff4b]',
    'l': '[Ll\u0139-\u0140\u01c7-\u01c9\u02e1\u1d38\u1e36\u1e37\u1e3a-\u1e3d\u2112\u2113\u2121\u216c\u217c\u24a7\u24c1\u24db\u32cf\u3388\u3389\u33d0-\u33d3\u33d5\u33d6\u33ff\ufb02\ufb04\uff2c\uff4c]',
    'm': '[Mm\u1d39\u1d50\u1e3e-\u1e43\u2120\u2122\u2133\u216f\u217f\u24a8\u24c2\u24dc\u3377-\u3379\u3383\u3386\u338e\u3392\u3396\u3399-\u33a8\u33ab\u33b3\u33b7\u33b9\u33bd\u33bf\u33c1\u33c2\u33ce\u33d0\u33d4-\u33d6\u33d8\u33d9\u33de\u33df\uff2d\uff4d]',
    'n': '[Nn\xd1\xf1\u0143-\u0149\u01ca-\u01cc\u01f8\u01f9\u1d3a\u1e44-\u1e4b\u207f\u2115\u2116\u24a9\u24c3\u24dd\u3381\u338b\u339a\u33b1\u33b5\u33bb\u33cc\u33d1\uff2e\uff4e]',
    'o': '[Oo\xba\xd2-\xd6\xf2-\xf6\u014c-\u0151\u01a0\u01a1\u01d1\u01d2\u01ea\u01eb\u020c-\u020f\u022e\u022f\u1d3c\u1d52\u1ecc-\u1ecf\u2092\u2105\u2116\u2134\u24aa\u24c4\u24de\u3375\u33c7\u33d2\u33d6\uff2f\uff4f]',
    'p': '[Pp\u1d3e\u1d56\u1e54-\u1e57\u2119\u24ab\u24c5\u24df\u3250\u3371\u3376\u3380\u338a\u33a9-\u33ac\u33b0\u33b4\u33ba\u33cb\u33d7-\u33da\uff30\uff50]',
    'q': '[Qq\u211a\u24ac\u24c6\u24e0\u33c3\uff31\uff51]',
    'r': '[Rr\u0154-\u0159\u0210-\u0213\u02b3\u1d3f\u1d63\u1e58-\u1e5b\u1e5e\u1e5f\u20a8\u211b-\u211d\u24ad\u24c7\u24e1\u32cd\u3374\u33ad-\u33af\u33da\u33db\uff32\uff52]',
    's': '[Ss\u015a-\u0161\u017f\u0218\u0219\u02e2\u1e60-\u1e63\u20a8\u2101\u2120\u24ae\u24c8\u24e2\u33a7\u33a8\u33ae-\u33b3\u33db\u33dc\ufb06\uff33\uff53]',
    't': '[Tt\u0162-\u0165\u021a\u021b\u1d40\u1d57\u1e6a-\u1e71\u1e97\u2121\u2122\u24af\u24c9\u24e3\u3250\u32cf\u3394\u33cf\ufb05\ufb06\uff34\uff54]',
    'u': '[Uu\xd9-\xdc\xf9-\xfc\u0168-\u0173\u01af\u01b0\u01d3\u01d4\u0214-\u0217\u1d41\u1d58\u1d64\u1e72-\u1e77\u1ee4-\u1ee7\u2106\u24b0\u24ca\u24e4\u3373\u337a\uff35\uff55]',
    'v': '[Vv\u1d5b\u1d65\u1e7c-\u1e7f\u2163-\u2167\u2173-\u2177\u24b1\u24cb\u24e5\u2c7d\u32ce\u3375\u33b4-\u33b9\u33dc\u33de\uff36\uff56]',
    'w': '[Ww\u0174\u0175\u02b7\u1d42\u1e80-\u1e89\u1e98\u24b2\u24cc\u24e6\u33ba-\u33bf\u33dd\uff37\uff57]',
    'x': '[Xx\u02e3\u1e8a-\u1e8d\u2093\u213b\u2168-\u216b\u2178-\u217b\u24b3\u24cd\u24e7\u33d3\uff38\uff58]',
    'y': '[Yy\xdd\xfd\xff\u0176-\u0178\u0232\u0233\u02b8\u1e8e\u1e8f\u1e99\u1ef2-\u1ef9\u24b4\u24ce\u24e8\u33c9\uff39\uff59]',
    'z': '[Zz\u0179-\u017e\u01f1-\u01f3\u1dbb\u1e90-\u1e95\u2124\u2128\u24b5\u24cf\u24e9\u3390-\u3394\uff3a\uff5a]'
};

function accent_fold(search_string) 
{
    // tidy up any pre- or post- whitespace
    search_string = trim(search_string);

    // protect any string literals that are special RE characters
    search_string = search_string.replace(/([|\(\)\[\{\}.+*?^$\\])/g,"\\$1");

    // replace characters by their compositors
    var accent_replacer = function(chr) {
	if (chr.charCodeAt(0)>128) {
	        for (var base_c in accented) {
		    var letter_re = new RegExp(accented[base_c],'gi');
		    if (letter_re.test(chr)) {
			    // Got accented char
			    // => downgrade to base character
			    chr = base_c;
			}
		    // otherwise, leave it alone
		        }
	    }
	return chr;
    }

    search_string = search_string.replace(/\S/g,accent_replacer);
    search_string = search_string.replace(/\\([|\(\)\[\{\}.+*?^$\\])/g,"$1");

    search_string = search_string.replace(/\s+/g," ");

    return search_string;
}


function opt_ligature_replacement(query_box_val) 
{

    if (ligature_re === null) {
        var ligature_str = Object.keys(ligature_map).join("|");
        ligature_re = new RegExp(ligature_str);
    }

    var detected_ligatures = ligature_re.test(query_box_val);
    var do_replacement = $('#meddle-lig').is(":checked");

    if (!do_replacement) {
	// option not on, but maybe the user hasn't realized their query contains ligatures 
	if (detected_ligatures) {
	    do_replacement = confirm("Detected ligatures in query. Replace with individual characters?");
	}
    }

    if (do_replacement) {
        var query_chars = query_box_val.split("");
        var query_chars_fixed = [];
	
        for (var i=0; i<query_chars.length; i++) {
	    var c = query_chars[i];
	    if (ligature_map[c]) {
		c = ligature_map[c];
	    }
	    query_chars_fixed.push(c);
        }
        query_box_val = query_chars_fixed.join("");
    }

    return query_box_val;
}

function opt_accent_fold(query_box_val) 
{

    var do_accent_replacement = $('#meddle-acc').is(":checked");

    if (do_accent_replacement) {
	query_box_val = accent_fold(query_box_val);
    }

    return query_box_val;
}


function fixupEncodeInput(form) {
    console.log( "amcm-dl-fixup fixupEncodeInput(form) called" );

    var query_box_val = form.elements['query'].value;
    query_box_val = opt_ligature_replacement(query_box_val);


    query_box_val = opt_accent_fold(query_box_val);

    // e.g., content.ftsec:(+capisco) 

    var query_box_val = query_box_val.replace(/^\s+/,"");
    var query_box_words = query_box_val.split(/\s+/);
    
    var query_box_val_plus = "";
    var query_box_val_double = "";
    
    for (var i=0; i<query_box_words.length; i++) {
	if (i>0) {
	    query_box_val_plus += " ";
	}
	query_box_val_plus += "+" + query_box_words[i];
	
	if (i>0) {
	    query_box_val_double += " " + query_box_words[i-1]+query_box_words[i];
	}
    }


    form.elements['query'].value = "content.ftsec:(" + query_box_val_plus + query_box_val_double + ")";


    return encodeInput(form);
}

function fixupSubmitIt() {
    var search_where = $("#fld0 option:selected").text();
    var x = 0;
    var search_select = $("#fld"+x+" option:selected");
    var search_where = search_select.text();    

    while (search_where) {
	if (search_where == "Any field") {
	    
	    $("#fld"+x).val('content.ftsec:');
	}
	x = x + 1;
	search_select = $("#fld"+x+" option:selected");    
	search_where = search_select.text();
    }
    buildQuery();

    return submitIt();
}

function meddleInfoBox() {

    // Icon image
    // By VistaICO.com (VistaICO Toolbar Icons) [CC BY 3.0 ]


    var dlcontextoptions = '<input id="meddle-lig" name="meddle-lig" type="checkbox"><label for="meddle-lig" style="display: inline">&nbsp;Ligature&nbsp;expansion</label>&nbsp;&nbsp;<input id="meddle-acc" name="meddle-acc" type="checkbox"><label for="meddle-acc" style="display: inline">&nbsp;Accent&nbsp;folding</label>';


   //console.log("*** location = " + window.location.pathname);
    var detected_dl = "";

    var domain_match = window.location.pathname.match(/nph-proxy-meddle.cgi\/.*?https?\/(.*)$/);

    if (domain_match.length>1) {
	var real_domain = domain_match[1];

	if (real_domain.match(/^dl\.acm\.org\//)) {
	    detected_dl = "ACM DL (Meddled with to provide: full-text quicksearch, word-wrap protection)";
	}
	else if (real_domain.match(/^scholar\.google\.[a-z]+/)) {
	    detected_dl = "Google Scholar";
	}
	else if (real_domain.match(/^www.springer\.com/)) {
	    detected_dl = "Springer";
	}
	else if (real_domain.match(/^ieeexplore\.ieee\.org\//)) {
	    detected_dl = "IEEE Xplore";
	}
    }

    if (detected_dl !== "") {
	$('#dlcontext').html("<i>Detected:" + detected_dl + "</i>");
    }

    $('#dlcontextoptions').html('<font size="-1">'+dlcontextoptions+'</font>');

    return detected_dl;
}


function acmdlFixupInit() {

    console.log("amc-dl-fixup initiated");

    var query_form = document.getElementsByName("qiksearch")[0];
    if (query_form) {
	query_form.setAttribute("onsubmit", "fixupEncodeInput(this) ; _proxy_jslib_flush_write_buffers();");
    }

    var adv_query_form = document.getElementById("theform");
    if (adv_query_form) {
	// javascript:submitIt();
	// javascript:; _proxy_jslib_proxify_html(submitIt())[0]

	adv_query_form.setAttribute("action","javascript:fixupSubmitIt();");
    }

    var query_box = document.getElementsByName("query")[0];
    if (query_box) {
	var query_box_val = query_box.getAttribute("value");
	query_box.setAttribute("value", query_box_val.replace(/content\.ftsec:\(\+(.*)\)/g,"$1"));
    }
    
    console.log("acm-dl-fixup DOM tweaks done");
}


function fixupGScholarSubmit(evt) {
    console.log( "gscholar-dl-fixup fixupGScholarSubmit(form) called" );

    var event = evt || window.event;
    form = event.target.id;

    event.preventDefault(); // to stop the form from submitting

    var query_box = document.getElementById("gs_hp_tsi");
    var query_box_val = query_box.value;

    query_box_val = opt_ligature_replacement(query_box_val);

    query_box_val = opt_accent_fold(query_box_val);

    query_box.value = query_box_val;

    _proxy_jslib_flush_write_buffers();

    var query_form = document.getElementsByName("f")[0];
    query_form.submit();
}

function gscholarFixupInit() {

    console.log("gscholar-fixup initiated");

    var query_form = document.getElementsByName("f")[0];
    if (query_form) {

	query_form.onsubmit = fixupGScholarSubmit;

    }
}


function fixupXploreSubmit(evt) {
    console.log( "xplore-dl-fixup fixupXploreSubmit(evt) called" );

    var event = evt || window.event;
    event.preventDefault(); // to stop the form from submitting

    var query_box = document.getElementById("input-basic");
    var query_box_val = query_box.value;

    query_box_val = opt_ligature_replacement(query_box_val);

/*
    var do_accent_replacement = $('#meddle-acc').is(":checked");
    if (do_accent_replacement) {
	query_box_val = accent_fold(query_box_val);
    }
*/

    query_box_val = opt_accent_fold(query_box_val);

    query_box.value = query_box_val;

    var query_form = document.getElementById("search_form");

    _proxy_jslib_flush_write_buffers(); // is this needed?
    query_form.submit();


}


function xploreFixupInit() {

    console.log("IEEE-Xpore DOM tweaks initiated");

    var query_form = document.getElementById("search_form");
    if (query_form) {
	query_form.onsubmit = fixupXploreSubmit;
    }
    
    console.log("IEEE-Xplore DOM tweaks done");
}



function fixupSpringerSubmit(evt) {
    console.log( "spring-dl-fixup fixupSpringerSubmit(evt) called" );

    var event = evt || window.event;
    event.preventDefault(); // to stop the form from submitting

    var query_box = document.getElementById("query");
    var query_box_val = query_box.value;

    query_box_val = opt_ligature_replacement(query_box_val);

    query_box_val = opt_accent_fold(query_box_val);

    query_box.value = query_box_val;

    var query_form = document.getElementById("global-search");

    _proxy_jslib_flush_write_buffers(); // is this needed?
    document.createElement('form').submit.call(query_form);

}


function fixupSpringerInit() {

    console.log("Springer DOM tweaks initiated");

    var query_form = document.getElementById("global-search");
    if (query_form) {
	query_form.onsubmit = fixupSpringerSubmit;
    }
    
    console.log("Springer DOM tweaks done");
}



$(document).ready(function() {
    console.log( "jquery DOM ready" );
    var detected_dl = meddleInfoBox();

    if (detected_dl.match(/^ACM DL/)) {
	acmdlFixupInit();
    }
    else if (detected_dl.match(/^Google Scholar/)) {
	gscholarFixupInit();
    }
    //xploreFixupInit();
    else if (detected_dl.match(/^Springer/)) {
	fixupSpringerInit();
    }

});