function _array_like_to_array(arr, len) {
    if (len == null || len > arr.length) len = arr.length;
    for(var i = 0, arr2 = new Array(len); i < len; i++)arr2[i] = arr[i];
    return arr2;
}
function _array_with_holes(arr) {
    if (Array.isArray(arr)) return arr;
}
function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
    try {
        var info = gen[key](arg);
        var value = info.value;
    } catch (error) {
        reject(error);
        return;
    }
    if (info.done) {
        resolve(value);
    } else {
        Promise.resolve(value).then(_next, _throw);
    }
}
function _async_to_generator(fn) {
    return function() {
        var self = this, args = arguments;
        return new Promise(function(resolve, reject) {
            var gen = fn.apply(self, args);
            function _next(value) {
                asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
            }
            function _throw(err) {
                asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
            }
            _next(undefined);
        });
    };
}
function _iterable_to_array_limit(arr, i) {
    var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"];
    if (_i == null) return;
    var _arr = [];
    var _n = true;
    var _d = false;
    var _s, _e;
    try {
        for(_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true){
            _arr.push(_s.value);
            if (i && _arr.length === i) break;
        }
    } catch (err) {
        _d = true;
        _e = err;
    } finally{
        try {
            if (!_n && _i["return"] != null) _i["return"]();
        } finally{
            if (_d) throw _e;
        }
    }
    return _arr;
}
function _non_iterable_rest() {
    throw new TypeError("Invalid attempt to destructure non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _sliced_to_array(arr, i) {
    return _array_with_holes(arr) || _iterable_to_array_limit(arr, i) || _unsupported_iterable_to_array(arr, i) || _non_iterable_rest();
}
function _unsupported_iterable_to_array(o, minLen) {
    if (!o) return;
    if (typeof o === "string") return _array_like_to_array(o, minLen);
    var n = Object.prototype.toString.call(o).slice(8, -1);
    if (n === "Object" && o.constructor) n = o.constructor.name;
    if (n === "Map" || n === "Set") return Array.from(n);
    if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _array_like_to_array(o, minLen);
}
function _ts_generator(thisArg, body) {
    var f, y, t, _ = {
        label: 0,
        sent: function() {
            if (t[0] & 1) throw t[1];
            return t[1];
        },
        trys: [],
        ops: []
    }, g = Object.create((typeof Iterator === "function" ? Iterator : Object).prototype), d = Object.defineProperty;
    return d(g, "next", {
        value: verb(0)
    }), d(g, "throw", {
        value: verb(1)
    }), d(g, "return", {
        value: verb(2)
    }), typeof Symbol === "function" && d(g, Symbol.iterator, {
        value: function() {
            return this;
        }
    }), g;
    function verb(n) {
        return function(v) {
            return step([
                n,
                v
            ]);
        };
    }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while(g && (g = 0, op[0] && (_ = 0)), _)try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [
                op[0] & 2,
                t.value
            ];
            switch(op[0]){
                case 0:
                case 1:
                    t = op;
                    break;
                case 4:
                    _.label++;
                    return {
                        value: op[1],
                        done: false
                    };
                case 5:
                    _.label++;
                    y = op[1];
                    op = [
                        0
                    ];
                    continue;
                case 7:
                    op = _.ops.pop();
                    _.trys.pop();
                    continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {
                        _ = 0;
                        continue;
                    }
                    if (op[0] === 3 && (!t || op[1] > t[0] && op[1] < t[3])) {
                        _.label = op[1];
                        break;
                    }
                    if (op[0] === 6 && _.label < t[1]) {
                        _.label = t[1];
                        t = op;
                        break;
                    }
                    if (t && _.label < t[2]) {
                        _.label = t[2];
                        _.ops.push(op);
                        break;
                    }
                    if (t[2]) _.ops.pop();
                    _.trys.pop();
                    continue;
            }
            op = body.call(thisArg, _);
        } catch (e) {
            op = [
                6,
                e
            ];
            y = 0;
        } finally{
            f = t = 0;
        }
        if (op[0] & 5) throw op[1];
        return {
            value: op[0] ? op[1] : void 0,
            done: true
        };
    }
}
import classNames from "classnames";
import React, { startTransition, useEffect, useRef, useState } from "react";
import { useGetSetState } from "react-use";
import { loadKatex } from "./loadKatex";
/**
 * Katex 组件 - KaTeX 数学公式渲染组件
 *
 * 该组件使用KaTeX库渲染数学公式，支持LaTeX语法，提供错误处理和延迟渲染。
 * 包含公式渲染、错误状态管理、占位符显示等功能。
 *
 * @component
 * @description KaTeX 数学公式渲染组件，支持LaTeX语法渲染
 * @param {Object} props - 组件属性
 * @param {CodeNode} props.el - 代码节点，包含公式内容
 * @param {string} [props.el.value] - LaTeX公式字符串
 *
 * @example
 * ```tsx
 * <Katex
 *   el={{
 *     type: 'code',
 *     value: '\\sum_{i=1}^{n} x_i = x_1 + x_2 + \\cdots + x_n'
 *   }}
 * />
 * ```
 *
 * @returns {React.ReactElement} 渲染的数学公式组件
 *
 * @remarks
 * - 基于KaTeX库实现数学公式渲染
 * - 支持LaTeX数学语法
 * - 提供延迟渲染优化性能
 * - 包含错误处理机制
 * - 支持占位符显示
 * - 提供美观的样式设计
 * - 禁用文本选择
 * - 居中显示公式
 */ export var Katex = function(props) {
    var _useGetSetState = _sliced_to_array(useGetSetState({
        code: '',
        error: ''
    }), 2), state = _useGetSetState[0], setState = _useGetSetState[1];
    var _useState = _sliced_to_array(useState(false), 2), katexLoaded = _useState[0], setKatexLoaded = _useState[1];
    var katexRef = useRef(null);
    var divRef = useRef(null);
    var timer = useRef(0);
    // 异步加载 Katex 库和 CSS
    useEffect(function() {
        if (process.env.NODE_ENV === 'test') {
            // 测试环境跳过加载
            setKatexLoaded(true);
            return;
        }
        startTransition(function() {
            // 异步加载在 startTransition 外部执行
            (function() {
                return _async_to_generator(function() {
                    var katexModule, error;
                    return _ts_generator(this, function(_state) {
                        switch(_state.label){
                            case 0:
                                _state.trys.push([
                                    0,
                                    2,
                                    ,
                                    3
                                ]);
                                return [
                                    4,
                                    loadKatex()
                                ];
                            case 1:
                                katexModule = _state.sent();
                                katexRef.current = katexModule.default;
                                setKatexLoaded(true);
                                return [
                                    3,
                                    3
                                ];
                            case 2:
                                error = _state.sent();
                                console.error('Failed to load Katex:', error);
                                // 即使加载失败也设置 loaded，避免无限加载
                                setKatexLoaded(true);
                                return [
                                    3,
                                    3
                                ];
                            case 3:
                                return [
                                    2
                                ];
                        }
                    });
                })();
            })();
        });
    }, []);
    useEffect(function() {
        if (!katexLoaded || !katexRef.current) return;
        var code = props.el.value || '';
        clearTimeout(timer.current);
        timer.current = window.setTimeout(function() {
            setState({
                code: code
            });
            if (state().code) {
                try {
                    if (divRef.current && katexRef.current) {
                        katexRef.current.render(state().code, divRef.current, {
                            strict: false,
                            output: 'htmlAndMathml',
                            throwOnError: false,
                            displayMode: true,
                            macros: {
                                '\\f': '#1f(#2)'
                            }
                        });
                    }
                } catch (e) {}
            } else {
                setState({
                    error: ''
                });
            }
        }, !state().code ? 0 : 300);
        return function() {
            return window.clearTimeout(timer.current);
        };
    }, [
        props.el,
        katexLoaded,
        state
    ]);
    return /*#__PURE__*/ React.createElement("div", {
        style: {
            marginBottom: '0.75em',
            cursor: 'default',
            userSelect: 'none',
            textAlign: 'center',
            backgroundColor: 'rgba(107, 114, 128, 0.05)',
            paddingTop: '1em',
            paddingBottom: '1em',
            borderRadius: '0.25em'
        },
        contentEditable: false
    }, /*#__PURE__*/ React.createElement("div", {
        ref: divRef,
        className: classNames('katex-container', {
            hidden: !state().code.trim()
        })
    }), !state().code.trim() && /*#__PURE__*/ React.createElement("div", {
        style: {
            textAlign: 'center',
            color: '#6B7280'
        }
    }, "Formula"));
};
