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 _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
        };
    }
}
var processEntry = function(entry) {
    return _async_to_generator(function() {
        return _ts_generator(this, function(_state) {
            return [
                2,
                new Promise(function(resolve) {
                    if (entry.isFile) {
                        entry.file(function(file) {
                            resolve([
                                file
                            ]);
                        });
                    } else if (entry.isDirectory) {
                        var dirReader = entry.createReader();
                        dirReader.readEntries(function(entries) {
                            return _async_to_generator(function() {
                                var filesPromises, fileArrays;
                                return _ts_generator(this, function(_state) {
                                    switch(_state.label){
                                        case 0:
                                            filesPromises = entries.map(function(element) {
                                                return processEntry(element);
                                            });
                                            return [
                                                4,
                                                Promise.all(filesPromises)
                                            ];
                                        case 1:
                                            fileArrays = _state.sent();
                                            resolve(fileArrays.flat());
                                            return [
                                                2
                                            ];
                                    }
                                });
                            })();
                        });
                    } else {
                        resolve([]);
                    }
                })
            ];
        });
    })();
};
export var getFileListFromDataTransferItems = function(event) {
    return _async_to_generator(function() {
        var _event_clipboardData, items, filePromises, _iteratorNormalCompletion, _didIteratorError, _iteratorError, _loop, _iterator, _step, fileArrays;
        return _ts_generator(this, function(_state) {
            switch(_state.label){
                case 0:
                    items = Array.from(((_event_clipboardData = event.clipboardData) === null || _event_clipboardData === void 0 ? void 0 : _event_clipboardData.items) || []);
                    if (items.length === 0) {
                        return [
                            2,
                            []
                        ];
                    }
                    // get filesList
                    filePromises = [];
                    _iteratorNormalCompletion = true, _didIteratorError = false, _iteratorError = undefined;
                    try {
                        _loop = function() {
                            var item = _step.value;
                            if (item.kind === 'file') {
                                // Safari browser may throw error when using FileSystemFileEntry.file()
                                // So we prioritize using getAsFile() method first for better browser compatibility
                                var file = item.getAsFile();
                                if (file) {
                                    filePromises.push(new Promise(function(resolve) {
                                        resolve([
                                            file
                                        ]);
                                    }));
                                } else {
                                    var entry = item.webkitGetAsEntry();
                                    if (entry) {
                                        filePromises.push(processEntry(entry));
                                    }
                                }
                            }
                        };
                        for(_iterator = items[Symbol.iterator](); !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true)_loop();
                    } 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()
                    ];
            }
        });
    })();
};
