const ConfigManager = {
    // 读取配置文件
    readConfigFile(callback) {
        if (typeof plus === 'undefined') {
            callback(new Error('plus is not defined. Run on a real device or emulator.'));
            return;
        }
        plus.io.resolveLocalFileSystemURL('_doc/config.json', function(entry) {
            entry.file(function(file) {
                const reader = new plus.io.FileReader();
                reader.onloadend = function(e) {
                    try {
                        const config = JSON.parse(e.target.result);
                        callback(null, config);
                    } catch (error) {
                        callback(error);
                    }
                };
                reader.readAsText(file);
            }, function(error) {
                callback(error);
            });
        }, function(error) {
            callback(error);
        });
    },

    // 保存配置文件
    saveConfigFile(newConfig, callback) {
        if (typeof plus === 'undefined') {
            callback(new Error('plus is not defined. Run on a real device or emulator.'));
            return;
        }
        plus.io.resolveLocalFileSystemURL('_doc/config.json', function(entry) {
            entry.createWriter(function(writer) {
                writer.onwriteend = function() {
                    callback(null);
                };
                writer.onerror = function(error) {
                    callback(error);
                };
                writer.write(JSON.stringify(newConfig));
            }, function(error) {
                callback(error);
            });
        }, function(error) {
            callback(error);
        });
    },

    // 初始化配置文件
    initializeConfigFile(defaultConfig, callback) {
        if (typeof plus === 'undefined') {
            callback(new Error('plus is not defined. Run on a real device or emulator.'));
            return;
        }
        plus.io.resolveLocalFileSystemURL('_doc/', function(directoryEntry) {
            directoryEntry.getFile('config.json', { create: true }, function(fileEntry) {
                fileEntry.createWriter(function(writer) {
                    writer.onwriteend = function() {
                        callback(null, defaultConfig);
                    };
                    writer.onerror = function(error) {
                        callback(error);
                    };
                    writer.write(JSON.stringify(defaultConfig));
                });
            });
        });
    },

    // 重置配置文件
    resetConfigFile(defaultConfig, callback) {
        this.initializeConfigFile(defaultConfig, callback);
    }
};

export default ConfigManager;