/**
* @output wp-includes/js/wplink.js
*/

/* global wpLink */

( function( $, wpLinkL10n, wp ) {
var editor, searchTimer, River, Query, correctedURL,
emailRegexp = /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,63}$/i,
urlRegexp = /^(https?|ftp):\/\/[A-Z0-9.-]+\.[A-Z]{2,63}[^ "]*$/i,
inputs = {},
rivers = {},
isTouch = ( 'ontouchend' in document );

function getLink() {
if ( editor ) {
return editor.$( 'a[data-wplink-edit="true"]' );
}

return null;
}

window.wpLink = {
timeToTriggerRiver: 150,
minRiverAJAXDuration: 200,
riverBottomThreshold: 5,
keySensitivity: 100,
lastSearch: '',
textarea: '',
modalOpen: false,

init: function() {
inputs.wrap = $('#wp-link-wrap');
inputs.dialog = $( '#wp-link' );
inputs.backdrop = $( '#wp-link-backdrop' );
inputs.submit = $( '#wp-link-submit' );
inputs.close = $( '#wp-link-close' );

// Input.
inputs.text = $( '#wp-link-text' );
inputs.url = $( '#wp-link-url' );
inputs.nonce = $( '#_ajax_linking_nonce' );
inputs.openInNewTab = $( '#wp-link-target' );
inputs.search = $( '#wp-link-search' );

// Build rivers.
rivers.search = new River( $( '#search-results' ) );
rivers.recent = new River( $( '#most-recent-results' ) );
rivers.elements = inputs.dialog.find( '.query-results' );

// Get search notice text.
inputs.queryNotice = $( '#query-notice-message' );
inputs.queryNoticeTextDefault = inputs.queryNotice.find( '.query-notice-default' );
inputs.queryNoticeTextHint = inputs.queryNotice.find( '.query-notice-hint' );

// Bind event handlers.
inputs.dialog.on( 'keydown', wpLink.keydown );
inputs.dialog.on( 'keyup', wpLink.keyup );
inputs.submit.on( 'click', function( event ) {
event.preventDefault();
wpLink.update();
});

inputs.close.add( inputs.backdrop ).add( '#wp-link-cancel button' ).on( 'click', function( event ) {
event.preventDefault();
wpLink.close();
});

rivers.elements.on( 'river-select', wpLink.updateFields );

// Display 'hint' message when search field or 'query-results' box are focused.
inputs.search.on( 'focus.wplink', function() {
inputs.queryNoticeTextDefault.hide();
inputs.queryNoticeTextHint.removeClass( 'screen-reader-text' ).show();
} ).on( 'blur.wplink', function() {
inputs.queryNoticeTextDefault.show();
inputs.queryNoticeTextHint.addClass( 'screen-reader-text' ).hide();
} );

inputs.search.on( 'keyup input', function() {
window.clearTimeout( searchTimer );
searchTimer = window.setTimeout( function() {
wpLink.searchInternalLinks();
}, 500 );
});

inputs.url.on( 'paste', function() {
setTimeout( wpLink.correctURL, 0 );
} );

inputs.url.on( 'blur', wpLink.correctURL );
},

// If URL wasn't corrected last time and doesn't start with http:, https:, ? # or /, prepend http://.
correctURL: function () {
var url = inputs.url.val().trim();

if ( url && correctedURL !== url && ! /^(?:[a-z]+:|#|\?|\.|\/)/.test( url ) ) {
inputs.url.val( 'http://' + url );
correctedURL = url;
}
},

open: function( editorId, url, text ) {
var ed,
$body = $( document.body );

$( '#wpwrap' ).attr( 'aria-hidden', 'true' );
$body.addClass( 'modal-open' );
wpLink.modalOpen = true;

wpLink.range = null;

if ( editorId ) {
window.wpActiveEditor = editorId;
}

if ( ! window.wpActiveEditor ) {
return;
}

this.textarea = $( '#' + window.wpActiveEditor ).get( 0 );

if ( typeof window.tinymce !== 'undefined' ) {
// Make sure the link wrapper is the last element in the body,
// or the inline editor toolbar may show above the backdrop.
$body.append( inputs.backdrop, inputs.wrap );

ed = window.tinymce.get( window.wpActiveEditor );

if ( ed && ! ed.isHidden() ) {
editor = ed;
} else {
editor = null;
}
}

if ( ! wpLink.isMCE() && document.selection ) {
this.textarea.focus();
this.range = document.selection.createRange();
}

inputs.wrap.show();
inputs.backdrop.show();

wpLink.refresh( url, text );

$( document ).trigger( 'wplink-open', inputs.wrap );
},

isMCE: function() {
return editor && ! editor.isHidden();
},

refresh: function( url, text ) {
var linkText = '';

// Refresh rivers (clear links, check visibility).
rivers.search.refresh();
rivers.recent.refresh();

if ( wpLink.isMCE() ) {
wpLink.mceRefresh( url, text );
} else {
// For the Text editor the "Link text" field is always shown.
if ( ! inputs.wrap.hasClass( 'has-text-field' ) ) {
inputs.wrap.addClass( 'has-text-field' );
}

if ( document.selection ) {
// Old IE.
linkText = document.selection.createRange().text || text || '';
} else if ( typeof this.textarea.selectionStart !== 'undefined' &&
( this.textarea.selectionStart !== this.textarea.selectionEnd ) ) {
// W3C.
text = this.textarea.value.substring( this.textarea.selectionStart, this.textarea.selectionEnd ) || text || '';
}

inputs.text.val( text );
wpLink.setDefaultValues();
}

if ( isTouch ) {
// Close the onscreen keyboard.
inputs.url.trigger( 'focus' ).trigger( 'blur' );
} else {
/*
* Focus the URL field and highlight its contents.
* If this is moved above the selection changes,
* IE will show a flashing cursor over the dialog.
*/
window.setTimeout( function() {
inputs.url[0].select();
inputs.url.trigger( 'focus' );
} );
}

// Load the most recent results if this is the first time opening the panel.
if ( ! rivers.recent.ul.children().length ) {
rivers.recent.ajax();
}

correctedURL = inputs.url.val().replace( /^http:\/\//, '' );
},

hasSelectedText: function( linkNode ) {
var node, nodes, i, html = editor.selection.getContent();

// Partial html and not a fully selected anchor element.
if ( /</.test( html ) && ( ! /^<a [^>]+>[^<]+<\/a>$/.test( html ) || html.indexOf('href=') === -1 ) ) {
return false;
}

if ( linkNode.length ) {
nodes = linkNode[0].childNodes;

if ( ! nodes || ! nodes.length ) {
return false;
}

for ( i = nodes.length - 1; i >= 0; i-- ) {
node = nodes[i];

if ( node.nodeType != 3 && ! window.tinymce.dom.BookmarkManager.isBookmarkNode( node ) ) {
return false;
}
}
}

return true;
},

mceRefresh: function( searchStr, text ) {
var linkText, href,
linkNode = getLink(),
onlyText = this.hasSelectedText( linkNode );

if ( linkNode.length ) {
linkText = linkNode.text();
href = linkNode.attr( 'href' );

if ( ! linkText.trim() ) {
linkText = text || '';
}

if ( searchStr && ( urlRegexp.test( searchStr ) || emailRegexp.test( searchStr ) ) ) {
href = searchStr;
}

if ( href !== '_wp_link_placeholder' ) {
inputs.url.val( href );
inputs.openInNewTab.prop( 'checked', '_blank' === linkNode.attr( 'target' ) );
inputs.submit.val( wpLinkL10n.update );
} else {
this.setDefaultValues( linkText );
}

if ( searchStr && searchStr !== href ) {
// The user has typed something in the inline dialog. Trigger a search with it.
inputs.search.val( searchStr );
} else {
inputs.search.val( '' );
}

// Always reset the search.
window.setTimeout( function() {
wpLink.searchInternalLinks();
} );
} else {
linkText = editor.selection.getContent({ format: 'text' }) || text || '';
this.setDefaultValues( linkText );
}

if ( onlyText ) {
inputs.text.val( linkText );
inputs.wrap.addClass( 'has-text-field' );
} else {
inputs.text.val( '' );
inputs.wrap.removeClass( 'has-text-field' );
}
},

close: function( reset ) {
$( document.body ).removeClass( 'modal-open' );
$( '#wpwrap' ).removeAttr( 'aria-hidden' );
wpLink.modalOpen = false;

if ( reset !== 'noReset' ) {
if ( ! wpLink.isMCE() ) {
wpLink.textarea.focus();

if ( wpLink.range ) {
wpLink.range.moveToBookmark( wpLink.range.getBookmark() );
wpLink.range.select();
}
} else {
if ( editor.plugins.wplink ) {
editor.plugins.wplink.close();
}

editor.focus();
}
}

inputs.backdrop.hide();
inputs.wrap.hide();

correctedURL = false;

$( document ).trigger( 'wplink-close', inputs.wrap );
},

getAttrs: function() {
wpLink.correctURL();

return {
href: inputs.url.val().trim(),
target: inputs.openInNewTab.prop( 'checked' ) ? '_blank' : null
};
},

buildHtml: function(attrs) {
var html = '<a href="' + attrs.href + '"';

if ( attrs.target ) {
html += ' target="' + attrs.target + '"';
}

return html + '>';
},

update: function() {
if ( wpLink.isMCE() ) {
wpLink.mceUpdate();
} else {
wpLink.htmlUpdate();
}
},

htmlUpdate: function() {
var attrs, text, html, begin, end, cursor, selection,
textarea = wpLink.textarea;

if ( ! textarea ) {
return;
}

attrs = wpLink.getAttrs();
text = inputs.text.val();

var parser = document.createElement( 'a' );
parser.href = attrs.href;

if ( 'javascript:' === parser.protocol || 'data:' === parser.protocol ) { // jshint ignore:line
attrs.href = '';
}

// If there's no href, return.
if ( ! attrs.href ) {
return;
}

html = wpLink.buildHtml(attrs);

// Insert HTML.
if ( document.selection && wpLink.range ) {
// IE.
// Note: If no text is selected, IE will not place the cursor
// inside the closing tag.
textarea.focus();
wpLink.range.text = html + ( text || wpLink.range.text ) + '</a>';
wpLink.range.moveToBookmark( wpLink.range.getBookmark() );
wpLink.range.select();

wpLink.range = null;
} else if ( typeof textarea.selectionStart !== 'undefined' ) {
// W3C.
begin = textarea.selectionStart;
end = textarea.selectionEnd;
selection = text || textarea.value.substring( begin, end );
html = html + selection + '</a>';
cursor = begin + html.length;

// If no text is selected, place the cursor inside the closing tag.
if ( begin === end && ! selection ) {
cursor -= 4;
}

textarea.value = (
textarea.value.substring( 0, begin ) +
html +
textarea.value.substring( end, textarea.value.length )
);

// Update cursor position.
textarea.selectionStart = textarea.selectionEnd = cursor;
}

wpLink.close();
textarea.focus();
$( textarea ).trigger( 'change' );

// Audible confirmation message when a link has been inserted in the Editor.
wp.a11y.speak( wpLinkL10n.linkInserted );
},

mceUpdate: function() {
var attrs = wpLink.getAttrs(),
$link, text, hasText;

var parser = document.createElement( 'a' );
parser.href = attrs.href;

if ( 'javascript:' === parser.protocol || 'data:' === parser.protocol ) { // jshint ignore:line
attrs.href = '';
}

if ( ! attrs.href ) {
editor.execCommand( 'unlink' );
wpLink.close();
return;
}

$link = getLink();

editor.undoManager.transact( function() {
if ( ! $link.length ) {
editor.execCommand( 'mceInsertLink', false, { href: '_wp_link_placeholder', 'data-wp-temp-link': 1 } );
$link = editor.$( 'a[data-wp-temp-link="1"]' ).removeAttr( 'data-wp-temp-link' );
hasText = $link.text().trim();
}

if ( ! $link.length ) {
editor.execCommand( 'unlink' );
} else {
if ( inputs.wrap.hasClass( 'has-text-field' ) ) {
text = inputs.text.val();

if ( text ) {
$link.text( text );
} else if ( ! hasText ) {
$link.text( attrs.href );
}
}

attrs['data-wplink-edit'] = null;
attrs['data-mce-href'] = attrs.href;
$link.attr( attrs );
}
} );

wpLink.close( 'noReset' );
editor.focus();

if ( $link.length ) {
editor.selection.select( $link[0] );

if ( editor.plugins.wplink ) {
editor.plugins.wplink.checkLink( $link[0] );
}
}

editor.nodeChanged();

// Audible confirmation message when a link has been inserted in the Editor.
wp.a11y.speak( wpLinkL10n.linkInserted );
},

updateFields: function( e, li ) {
inputs.url.val( li.children( '.item-permalink' ).val() );

if ( inputs.wrap.hasClass( 'has-text-field' ) && ! inputs.text.val() ) {
inputs.text.val( li.children( '.item-title' ).text() );
}
},

getUrlFromSelection: function( selection ) {
if ( ! selection ) {
if ( this.isMCE() ) {
selection = editor.selection.getContent({ format: 'text' });
} else if ( document.selection && wpLink.range ) {
selection = wpLink.range.text;
} else if ( typeof this.textarea.selectionStart !== 'undefined' ) {
selection = this.textarea.value.substring( this.textarea.selectionStart, this.textarea.selectionEnd );
}
}

selection = selection || '';
selection = selection.trim();

if ( selection && emailRegexp.test( selection ) ) {
// Selection is email address.
return 'mailto:' + selection;
} else if ( selection && urlRegexp.test( selection ) ) {
// Selection is URL.
return selection.replace( /&amp;|&#0?38;/gi, '&' );
}

return '';
},

setDefaultValues: function( selection ) {
inputs.url.val( this.getUrlFromSelection( selection ) );

// Empty the search field and swap the "rivers".
inputs.search.val('');
wpLink.searchInternalLinks();

// Update save prompt.
inputs.submit.val( wpLinkL10n.save );
},

searchInternalLinks: function() {
var waiting,
search = inputs.search.val() || '',
minInputLength = parseInt( wpLinkL10n.minInputLength, 10 ) || 3;

if ( search.length >= minInputLength ) {
rivers.recent.hide();
rivers.search.show();

// Don't search if the keypress didn't change the title.
if ( wpLink.lastSearch == search )
return;

wpLink.lastSearch = search;
waiting = inputs.search.parent().find( '.spinner' ).addClass( 'is-active' );

rivers.search.change( search );
rivers.search.ajax( function() {
waiting.removeClass( 'is-active' );
});
} else {
rivers.search.hide();
rivers.recent.show();
}
},

next: function() {
rivers.search.next();
rivers.recent.next();
},

prev: function() {
rivers.search.prev();
rivers.recent.prev();
},

keydown: function( event ) {
var fn, id;

// Escape key.
if ( 27 === event.keyCode ) {
wpLink.close();
event.stopImmediatePropagation();
// Tab key.
} else if ( 9 === event.keyCode ) {
id = event.target.id;

// wp-link-submit must always be the last focusable element in the dialog.
// Following focusable elements will be skipped on keyboard navigation.
if ( id === 'wp-link-submit' && ! event.shiftKey ) {
inputs.close.trigger( 'focus' );
event.preventDefault();
} else if ( id === 'wp-link-close' && event.shiftKey ) {
inputs.submit.trigger( 'focus' );
event.preventDefault();
}
}

// Up Arrow and Down Arrow keys.
if ( event.shiftKey || ( 38 !== event.keyCode && 40 !== event.keyCode ) ) {
return;
}

if ( document.activeElement &&
( document.activeElement.id === 'link-title-field' || document.activeElement.id === 'url-field' ) ) {
return;
}

// Up Arrow key.
fn = 38 === event.keyCode ? 'prev' : 'next';
clearInterval( wpLink.keyInterval );
wpLink[ fn ]();
wpLink.keyInterval = setInterval( wpLink[ fn ], wpLink.keySensitivity );
event.preventDefault();
},

keyup: function( event ) {
// Up Arrow and Down Arrow keys.
if ( 38 === event.keyCode || 40 === event.keyCode ) {
clearInterval( wpLink.keyInterval );
event.preventDefault();
}
},

delayedCallback: function( func, delay ) {
var timeoutTriggered, funcTriggered, funcArgs, funcContext;

if ( ! delay )
return func;

setTimeout( function() {
if ( funcTriggered )
return func.apply( funcContext, funcArgs );
// Otherwise, wait.
timeoutTriggered = true;
}, delay );

return function() {
if ( timeoutTriggered )
return func.apply( this, arguments );
// Otherwise, wait.
funcArgs = arguments;
funcContext = this;
funcTriggered = true;
};
}
};

River = function( element, search ) {
var self = this;
this.element = element;
this.ul = element.children( 'ul' );
this.contentHeight = element.children( '#link-selector-height' );
this.waiting = element.find('.river-waiting');

this.change( search );
this.refresh();

$( '#wp-link .query-results, #wp-link #link-selector' ).on( 'scroll', function() {
self.maybeLoad();
});
element.on( 'click', 'li', function( event ) {
self.select( $( this ), event );
});
};

$.extend( River.prototype, {
refresh: function() {
this.deselect();
this.visible = this.element.is( ':visible' );
},
show: function() {
if ( ! this.visible ) {
this.deselect();
this.element.show();
this.visible = true;
}
},
hide: function() {
this.element.hide();
this.visible = false;
},
// Selects a list item and triggers the river-select event.
select: function( li, event ) {
var liHeight, elHeight, liTop, elTop;

if ( li.hasClass( 'unselectable' ) || li == this.selected )
return;

this.deselect();
this.selected = li.addClass( 'selected' );
// Make sure the element is visible.
liHeight = li.outerHeight();
elHeight = this.element.height();
liTop = li.position().top;
elTop = this.element.scrollTop();

if ( liTop < 0 ) // Make first visible element.
this.element.scrollTop( elTop + liTop );
else if ( liTop + liHeight > elHeight ) // Make last visible element.
this.element.scrollTop( elTop + liTop - elHeight + liHeight );

// Trigger the river-select event.
this.element.trigger( 'river-select', [ li, event, this ] );
},
deselect: function() {
if ( this.selected )
this.selected.removeClass( 'selected' );
this.selected = false;
},
prev: function() {
if ( ! this.visible )
return;

var to;
if ( this.selected ) {
to = this.selected.prev( 'li' );
if ( to.length )
this.select( to );
}
},
next: function() {
if ( ! this.visible )
return;

var to = this.selected ? this.selected.next( 'li' ) : $( 'li:not(.unselectable):first', this.element );
if ( to.length )
this.select( to );
},
ajax: function( callback ) {
var self = this,
delay = this.query.page == 1 ? 0 : wpLink.minRiverAJAXDuration,
response = wpLink.delayedCallback( function( results, params ) {
self.process( results, params );
if ( callback )
callback( results, params );
}, delay );

this.query.ajax( response );
},
change: function( search ) {
if ( this.query && this._search == search )
return;

this._search = search;
this.query = new Query( search );
this.element.scrollTop( 0 );
},
process: function( results, params ) {
var list = '', alt = true, classes = '',
firstPage = params.page == 1;

if ( ! results ) {
if ( firstPage ) {
list += '<li class="unselectable no-matches-found"><span class="item-title"><em>' +
wpLinkL10n.noMatchesFound + '</em></span></li>';
}
} else {
$.each( results, function() {
classes = alt ? 'alternate' : '';
classes += this.title ? '' : ' no-title';
list += classes ? '<li class="' + classes + '">' : '<li>';
list += '<input type="hidden" class="item-permalink" value="' + this.permalink + '" />';
list += '<span class="item-title">';
list += this.title ? this.title : wpLinkL10n.noTitle;
list += '</span><span class="item-info">' + this.info + '</span></li>';
alt = ! alt;
});
}

this.ul[ firstPage ? 'html' : 'append' ]( list );
},
maybeLoad: function() {
var self = this,
el = this.element,
bottom = el.scrollTop() + el.height();

if ( ! this.query.ready() || bottom < this.contentHeight.height() - wpLink.riverBottomThreshold )
return;

setTimeout(function() {
var newTop = el.scrollTop(),
newBottom = newTop + el.height();

if ( ! self.query.ready() || newBottom < self.contentHeight.height() - wpLink.riverBottomThreshold )
return;

self.waiting.addClass( 'is-active' );
el.scrollTop( newTop + self.waiting.outerHeight() );

self.ajax( function() {
self.waiting.removeClass( 'is-active' );
});
}, wpLink.timeToTriggerRiver );
}
});

Query = function( search ) {
this.page = 1;
this.allLoaded = false;
this.querying = false;
this.search = search;
};

$.extend( Query.prototype, {
ready: function() {
return ! ( this.querying || this.allLoaded );
},
ajax: function( callback ) {
var self = this,
query = {
action : 'wp-link-ajax',
page : this.page,
'_ajax_linking_nonce' : inputs.nonce.val()
};

if ( this.search )
query.search = this.search;

this.querying = true;

$.post( window.ajaxurl, query, function( r ) {
self.page++;
self.querying = false;
self.allLoaded = ! r;
callback( r, query );
}, 'json' );
}
});

$( wpLink.init );
})( jQuery, window.wpLinkL10n, window.wp );