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_without_holes(arr) {
    if (Array.isArray(arr)) return _array_like_to_array(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(iter) {
    if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter);
}
function _non_iterable_spread() {
    throw new TypeError("Invalid attempt to spread non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _to_consumable_array(arr) {
    return _array_without_holes(arr) || _iterable_to_array(arr) || _unsupported_iterable_to_array(arr) || _non_iterable_spread();
}
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
        };
    }
}
/**
 * 读取目录下全部条目。
 *
 * 浏览器 `FileSystemDirectoryReader.readEntries` 单次最多返回 100 条（且不同浏览器实现不同），
 * 必须循环调用直到返回空数组才算读完，否则大目录会丢文件。
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryReader/readEntries
 */ var readAllDirectoryEntries = function readAllDirectoryEntries(dirReader) {
    return new Promise(function(resolve, reject) {
        var allEntries = [];
        var readBatch = function readBatch1() {
            dirReader.readEntries(function(entries) {
                var _allEntries;
                if (entries.length === 0) {
                    resolve(allEntries);
                    return;
                }
                (_allEntries = allEntries).push.apply(_allEntries, _to_consumable_array(entries));
                readBatch();
            }, function(error) {
                reject(error);
            });
        };
        readBatch();
    });
};
/**
 * 将单个 FileSystemFileEntry 解析为 File，失败时返回空数组（不阻塞整批）。
 */ var readFileEntry = function readFileEntry(entry) {
    return new Promise(function(resolve) {
        entry.file(function(file) {
            return resolve([
                file
            ]);
        }, function() {
            return resolve([]);
        });
    });
};
/**
 * 递归处理 FileSystemEntry，返回该条目下所有 File 对象。
 * - 文件：直接读取
 * - 目录：递归展开
 * - 其他：返回空
 */ var processEntry = function processEntry1(entry) {
    return _async_to_generator(function() {
        var dirReader, entries, fileArrays, unused;
        return _ts_generator(this, function(_state) {
            switch(_state.label){
                case 0:
                    if (entry.isFile) {
                        return [
                            2,
                            readFileEntry(entry)
                        ];
                    }
                    if (!entry.isDirectory) return [
                        3,
                        5
                    ];
                    _state.label = 1;
                case 1:
                    _state.trys.push([
                        1,
                        4,
                        ,
                        5
                    ]);
                    dirReader = entry.createReader();
                    return [
                        4,
                        readAllDirectoryEntries(dirReader)
                    ];
                case 2:
                    entries = _state.sent();
                    return [
                        4,
                        Promise.all(entries.map(processEntry))
                    ];
                case 3:
                    fileArrays = _state.sent();
                    return [
                        2,
                        fileArrays.flat()
                    ];
                case 4:
                    unused = _state.sent();
                    // 目录读取失败时返回空，避免 unhandled rejection
                    return [
                        2,
                        []
                    ];
                case 5:
                    return [
                        2,
                        []
                    ];
            }
        });
    })();
};
/**
 * 从剪贴板事件中提取所有 File 对象。
 *
 * 优先使用 `getAsFile()`（兼容 Safari），回退到 `webkitGetAsEntry()` 以支持目录粘贴。
 *
 * @param clipboardData - 剪贴板数据对象（`ClipboardEvent.clipboardData`）
 */ export var getFileListFromDataTransferItems = function getFileListFromDataTransferItems(clipboardData) {
    return _async_to_generator(function() {
        var items, filePromises, _iteratorNormalCompletion, _didIteratorError, _iteratorError, _iterator, _step, item, file, entry, fileArrays;
        return _ts_generator(this, function(_state) {
            switch(_state.label){
                case 0:
                    items = Array.from((clipboardData === null || clipboardData === void 0 ? void 0 : clipboardData.items) || []);
                    if (items.length === 0) {
                        return [
                            2,
                            []
                        ];
                    }
                    filePromises = [];
                    _iteratorNormalCompletion = true, _didIteratorError = false, _iteratorError = undefined;
                    try {
                        for(_iterator = items[Symbol.iterator](); !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true){
                            item = _step.value;
                            if (item.kind !== 'file') continue;
                            // Safari browser may throw error when using FileSystemFileEntry.file()
                            // So we prioritize using getAsFile() method first for better browser compatibility
                            file = item.getAsFile();
                            if (file) {
                                filePromises.push(Promise.resolve([
                                    file
                                ]));
                                continue;
                            }
                            entry = item.webkitGetAsEntry();
                            if (entry) {
                                filePromises.push(processEntry(entry));
                            }
                        }
                    } catch (err) {
                        _didIteratorError = true;
                        _iteratorError = err;
                    } finally{
                        try {
                            if (!_iteratorNormalCompletion && _iterator.return != null) {
                                _iterator.return();
                            }
                        } finally{
                            if (_didIteratorError) {
                                throw _iteratorError;
                            }
                        }
                    }
                    return [
                        4,
                        Promise.all(filePromises)
                    ];
                case 1:
                    fileArrays = _state.sent();
                    return [
                        2,
                        fileArrays.flat()
                    ];
            }
        });
    })();
};
