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

/* global tinymce, wpCookies, autosaveL10n, switchEditors */
// Back-compat.
window.autosave = function() {
return true;
};

/**
* Adds autosave to the window object on dom ready.
*
* @since 3.9.0
*
* @param {jQuery} $ jQuery object.
* @param {window} The window object.
*
*/
( function( $, window ) {
/**
* Auto saves the post.
*
* @since 3.9.0
*
* @return {Object}
* {{
* getPostData: getPostData,
* getCompareString: getCompareString,
* disableButtons: disableButtons,
* enableButtons: enableButtons,
* local: ({hasStorage, getSavedPostData, save, suspend, resume}|*),
* server: ({tempBlockSave, triggerSave, postChanged, suspend, resume}|*)
* }}
* The object with all functions for autosave.
*/
function autosave() {
var initialCompareString,
initialCompareData = {},
lastTriggerSave = 0,
$document = $( document );

/**
* Sets the initial compare data.
*
* @since 5.6.1
*/
function setInitialCompare() {
initialCompareData = {
post_title: $( '#title' ).val() || '',
content: $( '#content' ).val() || '',
excerpt: $( '#excerpt' ).val() || ''
};

initialCompareString = getCompareString( initialCompareData );
}

/**
* Returns the data saved in both local and remote autosave.
*
* @since 3.9.0
*
* @param {string} type The type of autosave either local or remote.
*
* @return {Object} Object containing the post data.
*/
function getPostData( type ) {
var post_name, parent_id, data,
time = ( new Date() ).getTime(),
cats = [],
editor = getEditor();

// Don't run editor.save() more often than every 3 seconds.
// It is resource intensive and might slow down typing in long posts on slow devices.
if ( editor && editor.isDirty() && ! editor.isHidden() && time - 3000 > lastTriggerSave ) {
editor.save();
lastTriggerSave = time;
}

data = {
post_id: $( '#post_ID' ).val() || 0,
post_type: $( '#post_type' ).val() || '',
post_author: $( '#post_author' ).val() || '',
post_title: $( '#title' ).val() || '',
content: $( '#content' ).val() || '',
excerpt: $( '#excerpt' ).val() || ''
};

if ( type === 'local' ) {
return data;
}

$( 'input[id^="in-category-"]:checked' ).each( function() {
cats.push( this.value );
});
data.catslist = cats.join(',');

if ( post_name = $( '#post_name' ).val() ) {
data.post_name = post_name;
}

if ( parent_id = $( '#parent_id' ).val() ) {
data.parent_id = parent_id;
}

if ( $( '#comment_status' ).prop( 'checked' ) ) {
data.comment_status = 'open';
}

if ( $( '#ping_status' ).prop( 'checked' ) ) {
data.ping_status = 'open';
}

if ( $( '#auto_draft' ).val() === '1' ) {
data.auto_draft = '1';
}

return data;
}

/**
* Concatenates the title, content and excerpt. This is used to track changes
* when auto-saving.
*
* @since 3.9.0
*
* @param {Object} postData The object containing the post data.
*
* @return {string} A concatenated string with title, content and excerpt.
*/
function getCompareString( postData ) {
if ( typeof postData === 'object' ) {
return ( postData.post_title || '' ) + '::' + ( postData.content || '' ) + '::' + ( postData.excerpt || '' );
}

return ( $('#title').val() || '' ) + '::' + ( $('#content').val() || '' ) + '::' + ( $('#excerpt').val() || '' );
}

/**
* Disables save buttons.
*
* @since 3.9.0
*
* @return {void}
*/
function disableButtons() {
$document.trigger('autosave-disable-buttons');

// Re-enable 5 sec later. Just gives autosave a head start to avoid collisions.
setTimeout( enableButtons, 5000 );
}

/**
* Enables save buttons.
*
* @since 3.9.0
*
* @return {void}
*/
function enableButtons() {
$document.trigger( 'autosave-enable-buttons' );
}

/**
* Gets the content editor.
*
* @since 4.6.0
*
* @return {boolean|*} Returns either false if the editor is undefined,
* or the instance of the content editor.
*/
function getEditor() {
return typeof tinymce !== 'undefined' && tinymce.get('content');
}

/**
* Autosave in localStorage.
*
* @since 3.9.0
*
* @return {
* {
* hasStorage: *,
* getSavedPostData: getSavedPostData,
* save: save,
* suspend: suspend,
* resume: resume
* }
* }
* The object with all functions for local storage autosave.
*/
function autosaveLocal() {
var blog_id, post_id, hasStorage, intervalTimer,
lastCompareString,
isSuspended = false;

/**
* Checks if the browser supports sessionStorage and it's not disabled.
*
* @since 3.9.0
*
* @return {boolean} True if the sessionStorage is supported and enabled.
*/
function checkStorage() {
var test = Math.random().toString(),
result = false;

try {
window.sessionStorage.setItem( 'wp-test', test );
result = window.sessionStorage.getItem( 'wp-test' ) === test;
window.sessionStorage.removeItem( 'wp-test' );
} catch(e) {}

hasStorage = result;
return result;
}

/**
* Initializes the local storage.
*
* @since 3.9.0
*
* @return {boolean|Object} False if no sessionStorage in the browser or an Object
* containing all postData for this blog.
*/
function getStorage() {
var stored_obj = false;
// Separate local storage containers for each blog_id.
if ( hasStorage && blog_id ) {
stored_obj = sessionStorage.getItem( 'wp-autosave-' + blog_id );

if ( stored_obj ) {
stored_obj = JSON.parse( stored_obj );
} else {
stored_obj = {};
}
}

return stored_obj;
}

/**
* Sets the storage for this blog. Confirms that the data was saved
* successfully.
*
* @since 3.9.0
*
* @return {boolean} True if the data was saved successfully, false if it wasn't saved.
*/
function setStorage( stored_obj ) {
var key;

if ( hasStorage && blog_id ) {
key = 'wp-autosave-' + blog_id;
sessionStorage.setItem( key, JSON.stringify( stored_obj ) );
return sessionStorage.getItem( key ) !== null;
}

return false;
}

/**
* Gets the saved post data for the current post.
*
* @since 3.9.0
*
* @return {boolean|Object} False if no storage or no data or the postData as an Object.
*/
function getSavedPostData() {
var stored = getStorage();

if ( ! stored || ! post_id ) {
return false;
}

return stored[ 'post_' + post_id ] || false;
}

/**
* Sets (save or delete) post data in the storage.
*
* If stored_data evaluates to 'false' the storage key for the current post will be removed.
*
* @since 3.9.0
*
* @param {Object|boolean|null} stored_data The post data to store or null/false/empty to delete the key.
*
* @return {boolean} True if data is stored, false if data was removed.
*/
function setData( stored_data ) {
var stored = getStorage();

if ( ! stored || ! post_id ) {
return false;
}

if ( stored_data ) {
stored[ 'post_' + post_id ] = stored_data;
} else if ( stored.hasOwnProperty( 'post_' + post_id ) ) {
delete stored[ 'post_' + post_id ];
} else {
return false;
}

return setStorage( stored );
}

/**
* Sets isSuspended to true.
*
* @since 3.9.0
*
* @return {void}
*/
function suspend() {
isSuspended = true;
}

/**
* Sets isSuspended to false.
*
* @since 3.9.0
*
* @return {void}
*/
function resume() {
isSuspended = false;
}

/**
* Saves post data for the current post.
*
* Runs on a 15 seconds interval, saves when there are differences in the post title or content.
* When the optional data is provided, updates the last saved post data.
*
* @since 3.9.0
*
* @param {Object} data The post data for saving, minimum 'post_title' and 'content'.
*
* @return {boolean} Returns true when data has been saved, otherwise it returns false.
*/
function save( data ) {
var postData, compareString,
result = false;

if ( isSuspended || ! hasStorage ) {
return false;
}

if ( data ) {
postData = getSavedPostData() || {};
$.extend( postData, data );
} else {
postData = getPostData('local');
}

compareString = getCompareString( postData );

if ( typeof lastCompareString === 'undefined' ) {
lastCompareString = initialCompareString;
}

// If the content, title and excerpt did not change since the last save, don't save again.
if ( compareString === lastCompareString ) {
return false;
}

postData.save_time = ( new Date() ).getTime();
postData.status = $( '#post_status' ).val() || '';
result = setData( postData );

if ( result ) {
lastCompareString = compareString;
}

return result;
}

/**
* Initializes the auto save function.
*
* Checks whether the editor is active or not to use the editor events
* to autosave, or uses the values from the elements to autosave.
*
* Runs on DOM ready.
*
* @since 3.9.0
*
* @return {void}
*/
function run() {
post_id = $('#post_ID').val() || 0;

// Check if the local post data is different than the loaded post data.
if ( $( '#wp-content-wrap' ).hasClass( 'tmce-active' ) ) {

/*
* If TinyMCE loads first, check the post 1.5 seconds after it is ready.
* By this time the content has been loaded in the editor and 'saved' to the textarea.
* This prevents false positives.
*/
$document.on( 'tinymce-editor-init.autosave', function() {
window.setTimeout( function() {
checkPost();
}, 1500 );
});
} else {
checkPost();
}

// Save every 15 seconds.
intervalTimer = window.setInterval( save, 15000 );

$( 'form#post' ).on( 'submit.autosave-local', function() {
var editor = getEditor(),
post_id = $('#post_ID').val() || 0;

if ( editor && ! editor.isHidden() ) {

// Last onSubmit event in the editor, needs to run after the content has been moved to the textarea.
editor.on( 'submit', function() {
save({
post_title: $( '#title' ).val() || '',
content: $( '#content' ).val() || '',
excerpt: $( '#excerpt' ).val() || ''
});
});
} else {
save({
post_title: $( '#title' ).val() || '',
content: $( '#content' ).val() || '',
excerpt: $( '#excerpt' ).val() || ''
});
}

var secure = ( 'https:' === window.location.protocol );
wpCookies.set( 'wp-saving-post', post_id + '-check', 24 * 60 * 60, false, false, secure );
});
}

/**
* Compares 2 strings. Removes whitespaces in the strings before comparing them.
*
* @since 3.9.0
*
* @param {string} str1 The first string.
* @param {string} str2 The second string.
* @return {boolean} True if the strings are the same.
*/
function compare( str1, str2 ) {
function removeSpaces( string ) {
return string.toString().replace(/[\x20\t\r\n\f]+/g, '');
}

return ( removeSpaces( str1 || '' ) === removeSpaces( str2 || '' ) );
}

/**
* Checks if the saved data for the current post (if any) is different than the
* loaded post data on the screen.
*
* Shows a standard message letting the user restore the post data if different.
*
* @since 3.9.0
*
* @return {void}
*/
function checkPost() {
var content, post_title, excerpt, $notice,
postData = getSavedPostData(),
cookie = wpCookies.get( 'wp-saving-post' ),
$newerAutosaveNotice = $( '#has-newer-autosave' ).parent( '.notice' ),
$headerEnd = $( '.wp-header-end' );

if ( cookie === post_id + '-saved' ) {
wpCookies.remove( 'wp-saving-post' );
// The post was saved properly, remove old data and bail.
setData( false );
return;
}

if ( ! postData ) {
return;
}

content = $( '#content' ).val() || '';
post_title = $( '#title' ).val() || '';
excerpt = $( '#excerpt' ).val() || '';

if ( compare( content, postData.content ) && compare( post_title, postData.post_title ) &&
compare( excerpt, postData.excerpt ) ) {

return;
}

/*
* If '.wp-header-end' is found, append the notices after it otherwise
* after the first h1 or h2 heading found within the main content.
*/
if ( ! $headerEnd.length ) {
$headerEnd = $( '.wrap h1, .wrap h2' ).first();
}

$notice = $( '#local-storage-notice' )
.insertAfter( $headerEnd )
.addClass( 'notice-warning' );

if ( $newerAutosaveNotice.length ) {

// If there is a "server" autosave notice, hide it.
// The data in the session storage is either the same or newer.
$newerAutosaveNotice.slideUp( 150, function() {
$notice.slideDown( 150 );
});
} else {
$notice.slideDown( 200 );
}

$notice.find( '.restore-backup' ).on( 'click.autosave-local', function() {
restorePost( postData );
$notice.fadeTo( 250, 0, function() {
$notice.slideUp( 150 );
});
});
}

/**
* Restores the current title, content and excerpt from postData.
*
* @since 3.9.0
*
* @param {Object} postData The object containing all post data.
*
* @return {boolean} True if the post is restored.
*/
function restorePost( postData ) {
var editor;

if ( postData ) {
// Set the last saved data.
lastCompareString = getCompareString( postData );

if ( $( '#title' ).val() !== postData.post_title ) {
$( '#title' ).trigger( 'focus' ).val( postData.post_title || '' );
}

$( '#excerpt' ).val( postData.excerpt || '' );
editor = getEditor();

if ( editor && ! editor.isHidden() && typeof switchEditors !== 'undefined' ) {
if ( editor.settings.wpautop && postData.content ) {
postData.content = switchEditors.wpautop( postData.content );
}

// Make sure there's an undo level in the editor.
editor.undoManager.transact( function() {
editor.setContent( postData.content || '' );
editor.nodeChanged();
});
} else {

// Make sure the Code editor is selected.
$( '#content-html' ).trigger( 'click' );
$( '#content' ).trigger( 'focus' );

// Using document.execCommand() will let the user undo.
document.execCommand( 'selectAll' );
document.execCommand( 'insertText', false, postData.content || '' );
}

return true;
}

return false;
}

blog_id = typeof window.autosaveL10n !== 'undefined' && window.autosaveL10n.blog_id;

/*
* Check if the browser supports sessionStorage and it's not disabled,
* then initialize and run checkPost().
* Don't run if the post type supports neither 'editor' (textarea#content) nor 'excerpt'.
*/
if ( checkStorage() && blog_id && ( $('#content').length || $('#excerpt').length ) ) {
$( run );
}

return {
hasStorage: hasStorage,
getSavedPostData: getSavedPostData,
save: save,
suspend: suspend,
resume: resume
};
}

/**
* Auto saves the post on the server.
*
* @since 3.9.0
*
* @return {Object} {
* {
* tempBlockSave: tempBlockSave,
* triggerSave: triggerSave,
* postChanged: postChanged,
* suspend: suspend,
* resume: resume
* }
* } The object all functions for autosave.
*/
function autosaveServer() {
var _blockSave, _blockSaveTimer, previousCompareString, lastCompareString,
nextRun = 0,
isSuspended = false;


/**
* Blocks saving for the next 10 seconds.
*
* @since 3.9.0
*
* @return {void}
*/
function tempBlockSave() {
_blockSave = true;
window.clearTimeout( _blockSaveTimer );

_blockSaveTimer = window.setTimeout( function() {
_blockSave = false;
}, 10000 );
}

/**
* Sets isSuspended to true.
*
* @since 3.9.0
*
* @return {void}
*/
function suspend() {
isSuspended = true;
}

/**
* Sets isSuspended to false.
*
* @since 3.9.0
*
* @return {void}
*/
function resume() {
isSuspended = false;
}

/**
* Triggers the autosave with the post data.
*
* @since 3.9.0
*
* @param {Object} data The post data.
*
* @return {void}
*/
function response( data ) {
_schedule();
_blockSave = false;
lastCompareString = previousCompareString;
previousCompareString = '';

$document.trigger( 'after-autosave', [data] );
enableButtons();

if ( data.success ) {
// No longer an auto-draft.
$( '#auto_draft' ).val('');
}
}

/**
* Saves immediately.
*
* Resets the timing and tells heartbeat to connect now.
*
* @since 3.9.0
*
* @return {void}
*/
function triggerSave() {
nextRun = 0;
wp.heartbeat.connectNow();
}

/**
* Checks if the post content in the textarea has changed since page load.
*
* This also happens when TinyMCE is active and editor.save() is triggered by
* wp.autosave.getPostData().
*
* @since 3.9.0
*
* @return {boolean} True if the post has been changed.
*/
function postChanged() {
var changed = false;

// If there are TinyMCE instances, loop through them.
if ( window.tinymce ) {
window.tinymce.each( [ 'content', 'excerpt' ], function( field ) {
var editor = window.tinymce.get( field );

if ( ! editor || editor.isHidden() ) {
if ( ( $( '#' + field ).val() || '' ) !== initialCompareData[ field ] ) {
changed = true;
// Break.
return false;
}
} else if ( editor.isDirty() ) {
changed = true;
return false;
}
} );

if ( ( $( '#title' ).val() || '' ) !== initialCompareData.post_title ) {
changed = true;
}

return changed;
}

return getCompareString() !== initialCompareString;
}

/**
* Checks if the post can be saved or not.
*
* If the post hasn't changed or it cannot be updated,
* because the autosave is blocked or suspended, the function returns false.
*
* @since 3.9.0
*
* @return {Object} Returns the post data.
*/
function save() {
var postData, compareString;

// window.autosave() used for back-compat.
if ( isSuspended || _blockSave || ! window.autosave() ) {
return false;
}

if ( ( new Date() ).getTime() < nextRun ) {
return false;
}

postData = getPostData();
compareString = getCompareString( postData );

// First check.
if ( typeof lastCompareString === 'undefined' ) {
lastCompareString = initialCompareString;
}

// No change.
if ( compareString === lastCompareString ) {
return false;
}

previousCompareString = compareString;
tempBlockSave();
disableButtons();

$document.trigger( 'wpcountwords', [ postData.content ] )
.trigger( 'before-autosave', [ postData ] );

postData._wpnonce = $( '#_wpnonce' ).val() || '';

return postData;
}

/**
* Sets the next run, based on the autosave interval.
*
* @private
*
* @since 3.9.0
*
* @return {void}
*/
function _schedule() {
nextRun = ( new Date() ).getTime() + ( autosaveL10n.autosaveInterval * 1000 ) || 60000;
}

/**
* Sets the autosaveData on the autosave heartbeat.
*
* @since 3.9.0
*
* @return {void}
*/
$( function() {
_schedule();
}).on( 'heartbeat-send.autosave', function( event, data ) {
var autosaveData = save();

if ( autosaveData ) {
data.wp_autosave = autosaveData;
}

/**
* Triggers the autosave of the post with the autosave data on the autosave
* heartbeat.
*
* @since 3.9.0
*
* @return {void}
*/
}).on( 'heartbeat-tick.autosave', function( event, data ) {
if ( data.wp_autosave ) {
response( data.wp_autosave );
}
/**
* Disables buttons and throws a notice when the connection is lost.
*
* @since 3.9.0
*
* @return {void}
*/
}).on( 'heartbeat-connection-lost.autosave', function( event, error, status ) {

// When connection is lost, keep user from submitting changes.
if ( 'timeout' === error || 603 === status ) {
var $notice = $('#lost-connection-notice');

if ( ! wp.autosave.local.hasStorage ) {
$notice.find('.hide-if-no-sessionstorage').hide();
}

$notice.show();
disableButtons();
}

/**
* Enables buttons when the connection is restored.
*
* @since 3.9.0
*
* @return {void}
*/
}).on( 'heartbeat-connection-restored.autosave', function() {
$('#lost-connection-notice').hide();
enableButtons();
});

return {
tempBlockSave: tempBlockSave,
triggerSave: triggerSave,
postChanged: postChanged,
suspend: suspend,
resume: resume
};
}

/**
* Sets the autosave time out.
*
* Wait for TinyMCE to initialize plus 1 second. for any external css to finish loading,
* then save to the textarea before setting initialCompareString.
* This avoids any insignificant differences between the initial textarea content and the content
* extracted from the editor.
*
* @since 3.9.0
*
* @return {void}
*/
$( function() {
// Set the initial compare string in case TinyMCE is not used or not loaded first.
setInitialCompare();
}).on( 'tinymce-editor-init.autosave', function( event, editor ) {
// Reset the initialCompare data after the TinyMCE instances have been initialized.
if ( 'content' === editor.id || 'excerpt' === editor.id ) {
window.setTimeout( function() {
editor.save();
setInitialCompare();
}, 1000 );
}
});

return {
getPostData: getPostData,
getCompareString: getCompareString,
disableButtons: disableButtons,
enableButtons: enableButtons,
local: autosaveLocal(),
server: autosaveServer()
};
}

/** @namespace wp */
window.wp = window.wp || {};
window.wp.autosave = autosave();

}( jQuery, window ));