'use strict';

var Tokenizer = require('../tokenizer'),
    HTML = require('./html');

//Aliases
var $ = HTML.TAG_NAMES,
    NS = HTML.NAMESPACES,
    ATTRS = HTML.ATTRS;


//MIME types
var MIME_TYPES = {
    TEXT_HTML: 'text/html',
    APPLICATION_XML: 'application/xhtml+xml'
};

//Attributes
var DEFINITION_URL_ATTR = 'definitionurl',
    ADJUSTED_DEFINITION_URL_ATTR = 'definitionURL',
    SVG_ATTRS_ADJUSTMENT_MAP = {
        'attributename': 'attributeName',
        'attributetype': 'attributeType',
        'basefrequency': 'baseFrequency',
        'baseprofile': 'baseProfile',
        'calcmode': 'calcMode',
        'clippathunits': 'clipPathUnits',
        'diffuseconstant': 'diffuseConstant',
        'edgemode': 'edgeMode',
        'filterunits': 'filterUnits',
        'glyphref': 'glyphRef',
        'gradienttransform': 'gradientTransform',
        'gradientunits': 'gradientUnits',
        'kernelmatrix': 'kernelMatrix',
        'kernelunitlength': 'kernelUnitLength',
        'keypoints': 'keyPoints',
        'keysplines': 'keySplines',
        'keytimes': 'keyTimes',
        'lengthadjust': 'lengthAdjust',
        'limitingconeangle': 'limitingConeAngle',
        'markerheight': 'markerHeight',
        'markerunits': 'markerUnits',
        'markerwidth': 'markerWidth',
        'maskcontentunits': 'maskContentUnits',
        'maskunits': 'maskUnits',
        'numoctaves': 'numOctaves',
        'pathlength': 'pathLength',
        'patterncontentunits': 'patternContentUnits',
        'patterntransform': 'patternTransform',
        'patternunits': 'patternUnits',
        'pointsatx': 'pointsAtX',
        'pointsaty': 'pointsAtY',
        'pointsatz': 'pointsAtZ',
        'preservealpha': 'preserveAlpha',
        'preserveaspectratio': 'preserveAspectRatio',
        'primitiveunits': 'primitiveUnits',
        'refx': 'refX',
        'refy': 'refY',
        'repeatcount': 'repeatCount',
        'repeatdur': 'repeatDur',
        'requiredextensions': 'requiredExtensions',
        'requiredfeatures': 'requiredFeatures',
        'specularconstant': 'specularConstant',
        'specularexponent': 'specularExponent',
        'spreadmethod': 'spreadMethod',
        'startoffset': 'startOffset',
        'stddeviation': 'stdDeviation',
        'stitchtiles': 'stitchTiles',
        'surfacescale': 'surfaceScale',
        'systemlanguage': 'systemLanguage',
        'tablevalues': 'tableValues',
        'targetx': 'targetX',
        'targety': 'targetY',
        'textlength': 'textLength',
        'viewbox': 'viewBox',
        'viewtarget': 'viewTarget',
        'xchannelselector': 'xChannelSelector',
        'ychannelselector': 'yChannelSelector',
        'zoomandpan': 'zoomAndPan'
    },
    XML_ATTRS_ADJUSTMENT_MAP = {
        'xlink:actuate': {prefix: 'xlink', name: 'actuate', namespace: NS.XLINK},
        'xlink:arcrole': {prefix: 'xlink', name: 'arcrole', namespace: NS.XLINK},
        'xlink:href': {prefix: 'xlink', name: 'href', namespace: NS.XLINK},
        'xlink:role': {prefix: 'xlink', name: 'role', namespace: NS.XLINK},
        'xlink:show': {prefix: 'xlink', name: 'show', namespace: NS.XLINK},
        'xlink:title': {prefix: 'xlink', name: 'title', namespace: NS.XLINK},
        'xlink:type': {prefix: 'xlink', name: 'type', namespace: NS.XLINK},
        'xml:base': {prefix: 'xml', name: 'base', namespace: NS.XML},
        'xml:lang': {prefix: 'xml', name: 'lang', namespace: NS.XML},
        'xml:space': {prefix: 'xml', name: 'space', namespace: NS.XML},
        'xmlns': {prefix: '', name: 'xmlns', namespace: NS.XMLNS},
        'xmlns:xlink': {prefix: 'xmlns', name: 'xlink', namespace: NS.XMLNS}

    };

//SVG tag names adjustment map
var SVG_TAG_NAMES_ADJUSTMENT_MAP = exports.SVG_TAG_NAMES_ADJUSTMENT_MAP = {
    'altglyph': 'altGlyph',
    'altglyphdef': 'altGlyphDef',
    'altglyphitem': 'altGlyphItem',
    'animatecolor': 'animateColor',
    'animatemotion': 'animateMotion',
    'animatetransform': 'animateTransform',
    'clippath': 'clipPath',
    'feblend': 'feBlend',
    'fecolormatrix': 'feColorMatrix',
    'fecomponenttransfer': 'feComponentTransfer',
    'fecomposite': 'feComposite',
    'feconvolvematrix': 'feConvolveMatrix',
    'fediffuselighting': 'feDiffuseLighting',
    'fedisplacementmap': 'feDisplacementMap',
    'fedistantlight': 'feDistantLight',
    'feflood': 'feFlood',
    'fefunca': 'feFuncA',
    'fefuncb': 'feFuncB',
    'fefuncg': 'feFuncG',
    'fefuncr': 'feFuncR',
    'fegaussianblur': 'feGaussianBlur',
    'feimage': 'feImage',
    'femerge': 'feMerge',
    'femergenode': 'feMergeNode',
    'femorphology': 'feMorphology',
    'feoffset': 'feOffset',
    'fepointlight': 'fePointLight',
    'fespecularlighting': 'feSpecularLighting',
    'fespotlight': 'feSpotLight',
    'fetile': 'feTile',
    'feturbulence': 'feTurbulence',
    'foreignobject': 'foreignObject',
    'glyphref': 'glyphRef',
    'lineargradient': 'linearGradient',
    'radialgradient': 'radialGradient',
    'textpath': 'textPath'
};

//Tags that causes exit from foreign content
var EXITS_FOREIGN_CONTENT = Object.create(null);

EXITS_FOREIGN_CONTENT[$.B] = true;
EXITS_FOREIGN_CONTENT[$.BIG] = true;
EXITS_FOREIGN_CONTENT[$.BLOCKQUOTE] = true;
EXITS_FOREIGN_CONTENT[$.BODY] = true;
EXITS_FOREIGN_CONTENT[$.BR] = true;
EXITS_FOREIGN_CONTENT[$.CENTER] = true;
EXITS_FOREIGN_CONTENT[$.CODE] = true;
EXITS_FOREIGN_CONTENT[$.DD] = true;
EXITS_FOREIGN_CONTENT[$.DIV] = true;
EXITS_FOREIGN_CONTENT[$.DL] = true;
EXITS_FOREIGN_CONTENT[$.DT] = true;
EXITS_FOREIGN_CONTENT[$.EM] = true;
EXITS_FOREIGN_CONTENT[$.EMBED] = true;
EXITS_FOREIGN_CONTENT[$.H1] = true;
EXITS_FOREIGN_CONTENT[$.H2] = true;
EXITS_FOREIGN_CONTENT[$.H3] = true;
EXITS_FOREIGN_CONTENT[$.H4] = true;
EXITS_FOREIGN_CONTENT[$.H5] = true;
EXITS_FOREIGN_CONTENT[$.H6] = true;
EXITS_FOREIGN_CONTENT[$.HEAD] = true;
EXITS_FOREIGN_CONTENT[$.HR] = true;
EXITS_FOREIGN_CONTENT[$.I] = true;
EXITS_FOREIGN_CONTENT[$.IMG] = true;
EXITS_FOREIGN_CONTENT[$.LI] = true;
EXITS_FOREIGN_CONTENT[$.LISTING] = true;
EXITS_FOREIGN_CONTENT[$.MENU] = true;
EXITS_FOREIGN_CONTENT[$.META] = true;
EXITS_FOREIGN_CONTENT[$.NOBR] = true;
EXITS_FOREIGN_CONTENT[$.OL] = true;
EXITS_FOREIGN_CONTENT[$.P] = true;
EXITS_FOREIGN_CONTENT[$.PRE] = true;
EXITS_FOREIGN_CONTENT[$.RUBY] = true;
EXITS_FOREIGN_CONTENT[$.S] = true;
EXITS_FOREIGN_CONTENT[$.SMALL] = true;
EXITS_FOREIGN_CONTENT[$.SPAN] = true;
EXITS_FOREIGN_CONTENT[$.STRONG] = true;
EXITS_FOREIGN_CONTENT[$.STRIKE] = true;
EXITS_FOREIGN_CONTENT[$.SUB] = true;
EXITS_FOREIGN_CONTENT[$.SUP] = true;
EXITS_FOREIGN_CONTENT[$.TABLE] = true;
EXITS_FOREIGN_CONTENT[$.TT] = true;
EXITS_FOREIGN_CONTENT[$.U] = true;
EXITS_FOREIGN_CONTENT[$.UL] = true;
EXITS_FOREIGN_CONTENT[$.VAR] = true;

//Check exit from foreign content
exports.causesExit = function (startTagToken) {
    var tn = startTagToken.tagName;
    var isFontWithAttrs = tn === $.FONT && (Tokenizer.getTokenAttr(startTagToken, ATTRS.COLOR) !== null ||
                                            Tokenizer.getTokenAttr(startTagToken, ATTRS.SIZE) !== null ||
                                            Tokenizer.getTokenAttr(startTagToken, ATTRS.FACE) !== null);

    return isFontWithAttrs ? true : EXITS_FOREIGN_CONTENT[tn];
};

//Token adjustments
exports.adjustTokenMathMLAttrs = function (token) {
    for (var i = 0; i < token.attrs.length; i++) {
        if (token.attrs[i].name === DEFINITION_URL_ATTR) {
            token.attrs[i].name = ADJUSTED_DEFINITION_URL_ATTR;
            break;
        }
    }
};

exports.adjustTokenSVGAttrs = function (token) {
    for (var i = 0; i < token.attrs.length; i++) {
        var adjustedAttrName = SVG_ATTRS_ADJUSTMENT_MAP[token.attrs[i].name];

        if (adjustedAttrName)
            token.attrs[i].name = adjustedAttrName;
    }
};

exports.adjustTokenXMLAttrs = function (token) {
    for (var i = 0; i < token.attrs.length; i++) {
        var adjustedAttrEntry = XML_ATTRS_ADJUSTMENT_MAP[token.attrs[i].name];

        if (adjustedAttrEntry) {
            token.attrs[i].prefix = adjustedAttrEntry.prefix;
            token.attrs[i].name = adjustedAttrEntry.name;
            token.attrs[i].namespace = adjustedAttrEntry.namespace;
        }
    }
};

exports.adjustTokenSVGTagName = function (token) {
    var adjustedTagName = SVG_TAG_NAMES_ADJUSTMENT_MAP[token.tagName];

    if (adjustedTagName)
        token.tagName = adjustedTagName;
};

//Integration points
function isMathMLTextIntegrationPoint(tn, ns) {
    return ns === NS.MATHML && (tn === $.MI || tn === $.MO || tn === $.MN || tn === $.MS || tn === $.MTEXT);
}

function isHtmlIntegrationPoint(tn, ns, attrs) {
    if (ns === NS.MATHML && tn === $.ANNOTATION_XML) {
        for (var i = 0; i < attrs.length; i++) {
            if (attrs[i].name === ATTRS.ENCODING) {
                var value = attrs[i].value.toLowerCase();

                return value === MIME_TYPES.TEXT_HTML || value === MIME_TYPES.APPLICATION_XML;
            }
        }
    }

    return ns === NS.SVG && (tn === $.FOREIGN_OBJECT || tn === $.DESC || tn === $.TITLE);
}

exports.isIntegrationPoint = function (tn, ns, attrs, foreignNS) {
    if ((!foreignNS || foreignNS === NS.HTML) && isHtmlIntegrationPoint(tn, ns, attrs))
        return true;

    if ((!foreignNS || foreignNS === NS.MATHML) && isMathMLTextIntegrationPoint(tn, ns))
        return true;

    return false;
};