(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
	typeof define === 'function' && define.amd ? define(['exports'], factory) :
	(factory((global.Shadow = {})));
}(this, (function (exports) { 'use strict';

	/**
	 * 脚本编辑器
	 * @author mrdoob / http://mrdoob.com/
	 * @author tengge / https://github.com/tengge1
	 * @param {*} container 容器
	 */
	function ScriptEditor(container = document.body) {
	    this.delay = null; // 代码校验延迟函数
	    this.delayTime = 1000; // 代码校验间隔时间（毫秒）

	    this.mode = 'javascript'; // 模式：json, vertexShader, fragmentShader, javascript
	    this.source = ''; // 代码

	    this.errorLines = []; // 代码错误行数
	    this.widgets = [];

	    // Code Mirror
	    var codemirror = CodeMirror(container, {
	        value: '',
	        lineNumbers: true,
	        matchBrackets: true,
	        indentWithTabs: true,
	        tabSize: 4,
	        indentUnit: 4,
	        hintOptions: {
	            completeSingle: false
	        }
	    });

	    codemirror.setOption('theme', 'monokai');
	    codemirror.on('change', this.onCodeMirrorChange.bind(this));

	    // 防止回退键删除物体
	    var wrapper = codemirror.getWrapperElement();
	    wrapper.addEventListener('keydown', event => {
	        event.stopPropagation();
	    });

	    // tern js 自动完成
	    var server = new CodeMirror.TernServer({
	        caseInsensitive: true,
	        plugins: { threejs: null }
	    });

	    // 快捷键
	    codemirror.setOption('extraKeys', {
	        'Ctrl-Space': cm => { server.complete(cm); },
	        'Ctrl-I': cm => { server.showType(cm); },
	        'Ctrl-O': cm => { server.showDocs(cm); },
	        'Alt-.': cm => { server.jumpToDef(cm); },
	        'Alt-,': cm => { server.jumpBack(cm); },
	        'Ctrl-Q': cm => { server.rename(cm); },
	        'Ctrl-.': cm => { server.selectName(cm); }
	    });

	    codemirror.on('cursorActivity', cm => {
	        if (this.mode !== 'javascript') {
	            return;
	        }
	        server.updateArgHints(cm);
	    });

	    codemirror.on('keypress', (cm, kb) => {
	        if (this.mode !== 'javascript') {
	            return;
	        }
	        var typed = String.fromCharCode(kb.which || kb.keyCode);
	        if (/[\w\.]/.exec(typed)) {
	            server.complete(cm);
	        }
	    });

	    this.codemirror = codemirror;
	}
	/**
	 * 设置编辑器脚本代码
	 * @param {*} source 源码
	 * @param {*} mode 模式 javascript, vertexShader, fragmentShader, json
	 * @param {*} cursorPosition 光标位置
	 * @param {*} scrollInfo 滚动信息
	 */
	ScriptEditor.prototype.setValue = function (
	    source = '',
	    mode = 'javascript',
	    cursorPosition = { line: 0, ch: 0 },
	    scrollInfo = { left: 0, top: 0 }
	) {
	    this.source = source;
	    this.mode = mode;

	    var codemirror = this.codemirror;

	    var history = codemirror.getHistory();

	    codemirror.setValue(source);

	    if (mode === 'json') {
	        codemirror.setOption('mode', {
	            name: 'javascript',
	            json: true
	        });
	    } else if (mode === 'vertexShader' || mode === 'fragmentShader') {
	        codemirror.setOption('mode', 'glsl');
	    } else {
	        codemirror.setOption('mode', mode);
	    }

	    codemirror.focus();

	    codemirror.setCursor(cursorPosition);
	    codemirror.scrollTo(scrollInfo.left, scrollInfo.top);

	    codemirror.setHistory(history);
	};

	/**
	 * 获取编辑器脚本代码
	 */
	ScriptEditor.prototype.getValue = function () {
	    return this.codemirror.getValue();
	};

	/**
	 * 清空编辑器
	 */
	ScriptEditor.prototype.clear = function () {
	    this.setValue();
	};

	// ---------------------- 内部函数 -----------------------------------------

	/**
	 * 代码修改事件
	 */
	ScriptEditor.prototype.onCodeMirrorChange = function () {
	    var codemirror = this.codemirror;

	    if (codemirror.state.focused === false) {
	        return;
	    }

	    if (this.delay) {
	        clearTimeout(this.delay);
	    }

	    this.delay = setTimeout(() => {
	        var code = codemirror.getValue();
	        this.validate(code);
	    }, this.delayTime);
	};

	/**
	 * 校验编辑器中代码正确性
	 * @param {*} string 
	 */
	ScriptEditor.prototype.validate = function (string) {
	    var codemirror = this.codemirror;
	    var mode = this.mode;

	    var errorLines = this.errorLines;
	    var widgets = this.widgets;

	    var errors = [];

	    return codemirror.operation(() => {
	        while (errorLines.length > 0) {
	            codemirror.removeLineClass(errorLines.shift(), 'background', 'errorLine');
	        }

	        while (widgets.length > 0) {
	            codemirror.removeLineWidget(widgets.shift());
	        }

	        switch (mode) {
	            case 'javascript':
	                try {
	                    var syntax = esprima.parse(string, { tolerant: true });
	                    errors = syntax.errors;
	                } catch (error) {
	                    errors.push({
	                        lineNumber: error.lineNumber - 1,
	                        message: error.message
	                    });
	                }

	                for (var i = 0; i < errors.length; i++) {
	                    var error = errors[i];
	                    error.message = error.message.replace(/Line [0-9]+: /, '');
	                }
	                break;
	            case 'json':
	                jsonlint.parseError = (message, info) => {
	                    message = message.split('\n')[3];
	                    errors.push({
	                        lineNumber: info.loc.first_line - 1,
	                        message: message
	                    });
	                };

	                try {
	                    jsonlint.parse(string);
	                } catch (error) {
	                    // ignore failed error recovery
	                }
	                break;
	            case 'vertexShader':
	            case 'fragmentShader':
	                try {
	                    var shaderType = mode === 'vertexShader' ? glslprep.Shader.VERTEX : glslprep.Shader.FRAGMENT;
	                    glslprep.parseGlsl(string, shaderType);
	                } catch (error) {
	                    if (error instanceof glslprep.SyntaxError) {
	                        errors.push({
	                            lineNumber: error.line,
	                            message: "Syntax Error: " + error.message
	                        });
	                    } else {
	                        console.error(error.stack || error);
	                    }
	                }
	        }

	        for (var i = 0; i < errors.length; i++) {
	            var error = errors[i];

	            var message = document.createElement('div');
	            message.className = 'esprima-error';
	            message.textContent = error.message;

	            var lineNumber = Math.max(error.lineNumber, 0);
	            errorLines.push(lineNumber);

	            codemirror.addLineClass(lineNumber, 'background', 'errorLine');

	            var widget = codemirror.addLineWidget(lineNumber, message);
	            widgets.push(widget);
	        }

	        return errors.length === 0;
	    });
	};

	exports.ScriptEditor = ScriptEditor;

	Object.defineProperty(exports, '__esModule', { value: true });

})));