/**
 * @output wp-admin/js/code-editor.js
 */

if ( 'undefined' === typeof window.wp ) {
/**
* @namespace wp
*/
window.wp = {};
}
if ( 'undefined' === typeof window.wp.codeEditor ) {
/**
* @namespace wp.codeEditor
*/
window.wp.codeEditor = {};
}

( function( $, wp ) {
'use strict';

/**
* Default settings for code editor.
*
* @since 4.9.0
* @type {object}
*/
wp.codeEditor.defaultSettings = {
codemirror: {},
csslint: {},
htmlhint: {},
jshint: {},
onTabNext: function() {},
onTabPrevious: function() {},
onChangeLintingErrors: function() {},
onUpdateErrorNotice: function() {}
};

/**
* Configure linting.
*
* @param {CodeMirror} editor - Editor.
* @param {Object}     settings - Code editor settings.
* @param {Object}     settings.codeMirror - Settings for CodeMirror.
* @param {Function}   settings.onChangeLintingErrors - Callback for when there are changes to linting errors.
* @param {Function}   settings.onUpdateErrorNotice - Callback to update error notice.
*
* @return {void}
*/
function configureLinting( editor, settings ) { // eslint-disable-line complexity
var currentErrorAnnotations = [], previouslyShownErrorAnnotations = [];

/**
* Call the onUpdateErrorNotice if there are new errors to show.
*
* @return {void}
*/
function updateErrorNotice() {
if ( settings.onUpdateErrorNotice && ! _.isEqual( currentErrorAnnotations, previouslyShownErrorAnnotations ) ) {
settings.onUpdateErrorNotice( currentErrorAnnotations, editor );
previouslyShownErrorAnnotations = currentErrorAnnotations;
}
}

/**
* Get lint options.
*
* @return {Object} Lint options.
*/
function getLintOptions() { // eslint-disable-line complexity
var options = editor.getOption( 'lint' );

if ( ! options ) {
return false;
}

if ( true === options ) {
options = {};
} else if ( _.isObject( options ) ) {
options = $.extend( {}, options );
}

/*
* Note that rules must be sent in the "deprecated" lint.options property
* to prevent linter from complaining about unrecognized options.
* See <https://github.com/codemirror/CodeMirror/pull/4944>.
*/
if ( ! options.options ) {
options.options = {};
}

// Configure JSHint.
if ( 'javascript' === settings.codemirror.mode && settings.jshint ) {
$.extend( options.options, settings.jshint );
}

// Configure CSSLint.
if ( 'css' === settings.codemirror.mode && settings.csslint ) {
$.extend( options.options, settings.csslint );
}

// Configure HTMLHint.
if ( 'htmlmixed' === settings.codemirror.mode && settings.htmlhint ) {
options.options.rules = $.extend( {}, settings.htmlhint );

if ( settings.jshint ) {
options.options.rules.jshint = settings.jshint;
}
if ( settings.csslint ) {
options.options.rules.csslint = settings.csslint;
}
}

// Wrap the onUpdateLinting CodeMirror event to route to onChangeLintingErrors and onUpdateErrorNotice.
options.onUpdateLinting = (function( onUpdateLintingOverridden ) {
return function( annotations, annotationsSorted, cm ) {
var errorAnnotations = _.filter( annotations, function( annotation ) {
return 'error' === annotation.severity;
} );

if ( onUpdateLintingOverridden ) {
onUpdateLintingOverridden.apply( annotations, annotationsSorted, cm );
}

// Skip if there are no changes to the errors.
if ( _.isEqual( errorAnnotations, currentErrorAnnotations ) ) {
return;
}

currentErrorAnnotations = errorAnnotations;

if ( settings.onChangeLintingErrors ) {
settings.onChangeLintingErrors( errorAnnotations, annotations, annotationsSorted, cm );
}

/*
* Update notifications when the editor is not focused to prevent error message
* from overwhelming the user during input, unless there are now no errors or there
* were previously errors shown. In these cases, update immediately so they can know
* that they fixed the errors.
*/
if ( ! editor.state.focused || 0 === currentErrorAnnotations.length || previouslyShownErrorAnnotations.length > 0 ) {
updateErrorNotice();
}
};
})( options.onUpdateLinting );

return options;
}

editor.setOption( 'lint', getLintOptions() );

// Keep lint options populated.
editor.on( 'optionChange', function( cm, option ) {
var options, gutters, gutterName = 'CodeMirror-lint-markers';
if ( 'lint' !== option ) {
return;
}
gutters = editor.getOption( 'gutters' ) || [];
options = editor.getOption( 'lint' );
if ( true === options ) {
if ( ! _.contains( gutters, gutterName ) ) {
editor.setOption( 'gutters', [ gutterName ].concat( gutters ) );
}
editor.setOption( 'lint', getLintOptions() ); // Expand to include linting options.
} else if ( ! options ) {
editor.setOption( 'gutters', _.without( gutters, gutterName ) );
}

// Force update on error notice to show or hide.
if ( editor.getOption( 'lint' ) ) {
editor.performLint();
} else {
currentErrorAnnotations = [];
updateErrorNotice();
}
} );

// Update error notice when leaving the editor.
editor.on( 'blur', updateErrorNotice );

// Work around hint selection with mouse causing focus to leave editor.
editor.on( 'startCompletion', function() {
editor.off( 'blur', updateErrorNotice );
} );
editor.on( 'endCompletion', function() {
var editorRefocusWait = 500;
editor.on( 'blur', updateErrorNotice );

// Wait for editor to possibly get re-focused after selection.
_.delay( function() {
if ( ! editor.state.focused ) {
updateErrorNotice();
}
}, editorRefocusWait );
});

/*
* Make sure setting validities are set if the user tries to click Publish
* while an autocomplete dropdown is still open. The Customizer will block
* saving when a setting has an error notifications on it. This is only
* necessary for mouse interactions because keyboards will have already
* blurred the field and cause onUpdateErrorNotice to have already been
* called.
*/
$( document.body ).on( 'mousedown', function( event ) {
if ( editor.state.focused && ! $.contains( editor.display.wrapper, event.target ) && ! $( event.target ).hasClass( 'CodeMirror-hint' ) ) {
updateErrorNotice();
}
});
}

/**
* Configure tabbing.
*
* @param {CodeMirror} codemirror - Editor.
* @param {Object}     settings - Code editor settings.
* @param {Object}     settings.codeMirror - Settings for CodeMirror.
* @param {Function}   settings.onTabNext - Callback to handle tabbing to the next tabbable element.
* @param {Function}   settings.onTabPrevious - Callback to handle tabbing to the previous tabbable element.
*
* @return {void}
*/
function configureTabbing( codemirror, settings ) {
var $textarea = $( codemirror.getTextArea() );

codemirror.on( 'blur', function() {
$textarea.data( 'next-tab-blurs', false );
});
codemirror.on( 'keydown', function onKeydown( editor, event ) {
var tabKeyCode = 9, escKeyCode = 27;

// Take note of the ESC keypress so that the next TAB can focus outside the editor.
if ( escKeyCode === event.keyCode ) {
$textarea.data( 'next-tab-blurs', true );
return;
}

// Short-circuit if tab key is not being pressed or the tab key press should move focus.
if ( tabKeyCode !== event.keyCode || ! $textarea.data( 'next-tab-blurs' ) ) {
return;
}

// Focus on previous or next focusable item.
if ( event.shiftKey ) {
settings.onTabPrevious( codemirror, event );
} else {
settings.onTabNext( codemirror, event );
}

// Reset tab state.
$textarea.data( 'next-tab-blurs', false );

// Prevent tab character from being added.
event.preventDefault();
});
}

/**
* @typedef {object} wp.codeEditor~CodeEditorInstance
* @property {object} settings - The code editor settings.
* @property {CodeMirror} codemirror - The CodeMirror instance.
*/

/**
* Initialize Code Editor (CodeMirror) for an existing textarea.
*
* @since 4.9.0
*
* @param {string|jQuery|Element} textarea - The HTML id, jQuery object, or DOM Element for the textarea that is used for the editor.
* @param {Object}                [settings] - Settings to override defaults.
* @param {Function}              [settings.onChangeLintingErrors] - Callback for when the linting errors have changed.
* @param {Function}              [settings.onUpdateErrorNotice] - Callback for when error notice should be displayed.
* @param {Function}              [settings.onTabPrevious] - Callback to handle tabbing to the previous tabbable element.
* @param {Function}              [settings.onTabNext] - Callback to handle tabbing to the next tabbable element.
* @param {Object}                [settings.codemirror] - Options for CodeMirror.
* @param {Object}                [settings.csslint] - Rules for CSSLint.
* @param {Object}                [settings.htmlhint] - Rules for HTMLHint.
* @param {Object}                [settings.jshint] - Rules for JSHint.
*
* @return {CodeEditorInstance} Instance.
*/
wp.codeEditor.initialize = function initialize( textarea, settings ) {
var $textarea, codemirror, instanceSettings, instance;
if ( 'string' === typeof textarea ) {
$textarea = $( '#' + textarea );
} else {
$textarea = $( textarea );
}

instanceSettings = $.extend( {}, wp.codeEditor.defaultSettings, settings );
instanceSettings.codemirror = $.extend( {}, instanceSettings.codemirror );

codemirror = wp.CodeMirror.fromTextArea( $textarea[0], instanceSettings.codemirror );

configureLinting( codemirror, instanceSettings );

instance = {
settings: instanceSettings,
codemirror: codemirror
};

if ( codemirror.showHint ) {
codemirror.on( 'keyup', function( editor, event ) { // eslint-disable-line complexity
var shouldAutocomplete, isAlphaKey = /^[a-zA-Z]$/.test( event.key ), lineBeforeCursor, innerMode, token;
if ( codemirror.state.completionActive && isAlphaKey ) {
return;
}

// Prevent autocompletion in string literals or comments.
token = codemirror.getTokenAt( codemirror.getCursor() );
if ( 'string' === token.type || 'comment' === token.type ) {
return;
}

innerMode = wp.CodeMirror.innerMode( codemirror.getMode(), token.state ).mode.name;
lineBeforeCursor = codemirror.doc.getLine( codemirror.doc.getCursor().line ).substr( 0, codemirror.doc.getCursor().ch );
if ( 'html' === innerMode || 'xml' === innerMode ) {
shouldAutocomplete =
'<' === event.key ||
'/' === event.key && 'tag' === token.type ||
isAlphaKey && 'tag' === token.type ||
isAlphaKey && 'attribute' === token.type ||
'=' === token.string && token.state.htmlState && token.state.htmlState.tagName;
} else if ( 'css' === innerMode ) {
shouldAutocomplete =
isAlphaKey ||
':' === event.key ||
' ' === event.key && /:\s+$/.test( lineBeforeCursor );
} else if ( 'javascript' === innerMode ) {
shouldAutocomplete = isAlphaKey || '.' === event.key;
} else if ( 'clike' === innerMode && 'php' === codemirror.options.mode ) {
shouldAutocomplete = 'keyword' === token.type || 'variable' === token.type;
}
if ( shouldAutocomplete ) {
codemirror.showHint( { completeSingle: false } );
}
});
}

// Facilitate tabbing out of the editor.
configureTabbing( codemirror, settings );

return instance;
};

})( window.jQuery, window.wp );