/*!
MIT License

Copyright (c) 2018 Arturas Molcanovas <a.molcanovas@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

*/


/**
 * Abstracts constructing a Blob object, so it also works in older
 * browsers that don't support the native Blob constructor. (i.e.
 * old QtWebKit versions, at least).
 * Abstracts constructing a Blob object, so it also works in older
 * browsers that don't support the native Blob constructor. (i.e.
 * old QtWebKit versions, at least).
 *
 * @param parts
 * @param properties
 */
function createBlob(parts, properties) {
    /* global BlobBuilder,MSBlobBuilder,MozBlobBuilder,WebKitBlobBuilder */
    parts = parts || [];
    properties = properties || {};
    try {
        return new Blob(parts, properties);
    }
    catch (e) {
        if (e.name !== 'TypeError') {
            throw e;
        }
        //tslint:disable-next-line:variable-name
        const Builder = typeof BlobBuilder !== 'undefined' ? BlobBuilder
            : typeof MSBlobBuilder !== 'undefined' ? MSBlobBuilder
                : typeof MozBlobBuilder !== 'undefined' ? MozBlobBuilder
                    : WebKitBlobBuilder;
        const builder = new Builder();
        for (let i = 0; i < parts.length; i += 1) {
            builder.append(parts[i]);
        }
        return builder.getBlob(properties.type);
    }
}

const BLOB_TYPE_PREFIX_REGEX = /^~~local_forage_type~([^~]+)~/;
const SERIALIZED_MARKER_LENGTH = "__lfsc__:" /* SERIALIZED_MARKER */.length;
const TYPE_SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER_LENGTH + "arbf" /* TYPE_ARRAYBUFFER */.length;
//tslint:disable:no-magic-numbers no-bitwise prefer-switch no-unbound-method
const toString = Object.prototype.toString;
function stringToBuffer(serializedString) {
    // Fill the string into a ArrayBuffer.
    let bufferLength = serializedString.length * 0.75;
    const len = serializedString.length;
    if (serializedString[serializedString.length - 1] === '=') {
        bufferLength--;
        if (serializedString[serializedString.length - 2] === '=') {
            bufferLength--;
        }
    }
    const buffer = new ArrayBuffer(bufferLength);
    const bytes = new Uint8Array(buffer);
    for (let i = 0, p = 0; i < len; i += 4) {
        const encoded1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */.indexOf(serializedString[i]);
        const encoded2 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */.indexOf(serializedString[i + 1]);
        const encoded3 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */.indexOf(serializedString[i + 2]);
        const encoded4 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */.indexOf(serializedString[i + 3]);
        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
    }
    return buffer;
}
/**
 * Converts a buffer to a string to store, serialized, in the backend
 * storage library.
 */
function bufferToString(buffer) {
    // base64-arraybuffer
    const bytes = new Uint8Array(buffer);
    let base64String = '';
    for (let i = 0; i < bytes.length; i += 3) {
        /*jslint bitwise: true */
        base64String += "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */[bytes[i] >> 2];
        base64String += "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
        base64String +=
            "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
        base64String += "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" /* BASE_CHARS */[bytes[i + 2] & 63];
    }
    if (bytes.length % 3 === 2) {
        base64String = base64String.substring(0, base64String.length - 1) + '=';
    }
    else if (bytes.length % 3 === 1) {
        base64String = base64String.substring(0, base64String.length - 2) + '==';
    }
    return base64String;
}
/**
 * Serialize a value, afterwards executing a callback (which usually
 * instructs the `setItem()` callback/promise to be executed). This is how
 * we store binary data with localStorage.
 * @param value
 * @param callback
 */
function serialize(value, callback) {
    let valueType = '';
    if (value) {
        valueType = toString.call(value);
    }
    // Cannot use `value instanceof ArrayBuffer` or such here, as these
    // checks fail when running the tests using casper.js...
    if (value && (valueType === '[object ArrayBuffer]' ||
        (value.buffer && toString.call(value.buffer) === '[object ArrayBuffer]'))) {
        // Convert binary arrays to a string and prefix the string with
        // a special marker.
        let buffer;
        let marker = "__lfsc__:" /* SERIALIZED_MARKER */;
        if (value instanceof ArrayBuffer) {
            buffer = value;
            marker += "arbf" /* TYPE_ARRAYBUFFER */;
        }
        else {
            buffer = value.buffer;
            if (valueType === '[object Int8Array]') {
                marker += "si08" /* TYPE_INT8ARRAY */;
            }
            else if (valueType === '[object Uint8Array]') {
                marker += "ui08" /* TYPE_UINT8ARRAY */;
            }
            else if (valueType === '[object Uint8ClampedArray]') {
                marker += "uic8" /* TYPE_UINT8CLAMPEDARRAY */;
            }
            else if (valueType === '[object Int16Array]') {
                marker += "si16" /* TYPE_INT16ARRAY */;
            }
            else if (valueType === '[object Uint16Array]') {
                marker += "ur16" /* TYPE_UINT16ARRAY */;
            }
            else if (valueType === '[object Int32Array]') {
                marker += "si32" /* TYPE_INT32ARRAY */;
            }
            else if (valueType === '[object Uint32Array]') {
                marker += "ui32" /* TYPE_UINT32ARRAY */;
            }
            else if (valueType === '[object Float32Array]') {
                marker += "fl32" /* TYPE_FLOAT32ARRAY */;
            }
            else if (valueType === '[object Float64Array]') {
                marker += "fl64" /* TYPE_FLOAT64ARRAY */;
            }
            else {
                callback(new Error('Failed to get type for BinaryArray'));
            }
        }
        callback(marker + bufferToString(buffer));
    }
    else if (valueType === '[object Blob]') {
        // Convert the blob to a binaryArray and then to a string.
        const fileReader = new FileReader();
        fileReader.onload = function () {
            // Backwards-compatible prefix for the blob type.
            //tslint:disable-next-line:restrict-plus-operands
            const str = `${"~~local_forage_type~" /* BLOB_TYPE_PREFIX */ + value.type}~${bufferToString(this.result)}`;
            callback("__lfsc__:" /* SERIALIZED_MARKER */ + "blob" /* TYPE_BLOB */ + str);
        };
        fileReader.readAsArrayBuffer(value);
    }
    else {
        try {
            callback(JSON.stringify(value));
        }
        catch (e) {
            console.error('Couldn\'t convert value into a JSON string: ', value);
            callback(null, e);
        }
    }
}
/**
 * Deserialize data we've inserted into a value column/field. We place
 * special markers into our strings to mark them as encoded; this isn't
 * as nice as a meta field, but it's the only sane thing we can do whilst
 * keeping localStorage support intact.
 *
 * Oftentimes this will just deserialize JSON content, but if we have a
 * special marker (SERIALIZED_MARKER, defined above), we will extract
 * some kind of arraybuffer/binary data/typed array out of the string.
 * @param value
 */
function deserialize(value) {
    // If we haven't marked this string as being specially serialized (i.e.
    // something other than serialized JSON), we can just return it and be
    // done with it.
    if (value.substring(0, SERIALIZED_MARKER_LENGTH) !== "__lfsc__:" /* SERIALIZED_MARKER */) {
        return JSON.parse(value);
    }
    // The following code deals with deserializing some kind of Blob or
    // TypedArray. First we separate out the type of data we're dealing
    // with from the data itself.
    let serializedString = value.substring(TYPE_SERIALIZED_MARKER_LENGTH);
    const type = value.substring(SERIALIZED_MARKER_LENGTH, TYPE_SERIALIZED_MARKER_LENGTH);
    let blobType;
    // Backwards-compatible blob type serialization strategy.
    // DBs created with older versions of localForage will simply not have the blob type.
    if (type === "blob" /* TYPE_BLOB */ && BLOB_TYPE_PREFIX_REGEX.test(serializedString)) {
        const matcher = serializedString.match(BLOB_TYPE_PREFIX_REGEX);
        blobType = matcher[1];
        serializedString = serializedString.substring(matcher[0].length);
    }
    const buffer = stringToBuffer(serializedString);
    // Return the right type based on the code/type set during
    // serialization.
    switch (type) {
        case "arbf" /* TYPE_ARRAYBUFFER */:
            return buffer;
        case "blob" /* TYPE_BLOB */:
            return createBlob([buffer], { type: blobType });
        case "si08" /* TYPE_INT8ARRAY */:
            return new Int8Array(buffer);
        case "ui08" /* TYPE_UINT8ARRAY */:
            return new Uint8Array(buffer);
        case "uic8" /* TYPE_UINT8CLAMPEDARRAY */:
            return new Uint8ClampedArray(buffer);
        case "si16" /* TYPE_INT16ARRAY */:
            return new Int16Array(buffer);
        case "ur16" /* TYPE_UINT16ARRAY */:
            return new Uint16Array(buffer);
        case "si32" /* TYPE_INT32ARRAY */:
            return new Int32Array(buffer);
        case "ui32" /* TYPE_UINT32ARRAY */:
            return new Uint32Array(buffer);
        case "fl32" /* TYPE_FLOAT32ARRAY */:
            return new Float32Array(buffer);
        case "fl64" /* TYPE_FLOAT64ARRAY */:
            return new Float64Array(buffer);
        default:
            throw new Error('Unkown type: ' + type);
    }
}

function clone(obj) {
    if (obj === null || typeof (obj) !== 'object' || 'isActiveClone' in obj) {
        return obj;
    }
    const temp = obj instanceof Date ? new Date(obj) : (obj.constructor());
    for (const key of Object.keys(obj)) {
        if (Object.prototype.hasOwnProperty.call(obj, key)) {
            obj['isActiveClone'] = null;
            temp[key] = clone(obj[key]);
            delete obj['isActiveClone'];
        }
    }
    return temp;
}

function getKeyPrefix(options, defaultConfig) {
    return `${options.name || defaultConfig.name}/${options.storeName || defaultConfig.storeName}/`;
}

function executeCallback(promise, callback) {
    if (callback) {
        promise.then((result) => {
            callback(null, result);
        }, (error) => {
            callback(error);
        });
    }
}

function getCallback(..._args) {
    if (arguments.length && typeof arguments[arguments.length - 1] === 'function') {
        return arguments[arguments.length - 1];
    }
}

//tslint:disable-next-line:no-ignored-initial-value
function dropInstanceCommon(options, callback) {
    callback = getCallback.apply(this, arguments);
    options = (typeof options !== 'function' && options) || {};
    if (!options.name) {
        const currentConfig = this.config();
        options.name = options.name || currentConfig.name;
        options.storeName = options.storeName || currentConfig.storeName;
    }
    let promise;
    if (!options.name) {
        promise = Promise.reject('Invalid arguments');
    }
    else {
        promise = new Promise(resolve => {
            if (!options.storeName) {
                resolve(`${options.name}/`);
            }
            else {
                resolve(getKeyPrefix(options, this._defaultConfig));
            }
        });
    }
    return { promise, callback };
}

function normaliseKey(key) {
    // Cast the key to a string, as that's all we can set as a key.
    if (typeof key !== 'string') {
        console.warn(`${key} used as a key, but it is not a string.`);
        key = String(key);
    }
    return key;
}

const serialiser = {
    bufferToString,
    deserialize,
    serialize,
    stringToBuffer
};

export { serialiser, clone, getKeyPrefix, executeCallback, getCallback, dropInstanceCommon, normaliseKey };
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