'use strict';
var StringReader = require('./stringReader');
var utils = require('./utils');
var CompressedObject = require('./compressedObject');
var jszipProto = require('./object');

var MADE_BY_DOS = 0x00;
var MADE_BY_UNIX = 0x03;

// class ZipEntry {{{
/**
 * An entry in the zip file.
 * @constructor
 * @param {Object} options Options of the current file.
 * @param {Object} loadOptions Options for loading the stream.
 */
function ZipEntry(options, loadOptions) {
    this.options = options;
    this.loadOptions = loadOptions;
}
ZipEntry.prototype = {
    /**
     * say if the file is encrypted.
     * @return {boolean} true if the file is encrypted, false otherwise.
     */
    isEncrypted: function() {
        // bit 1 is set
        return (this.bitFlag & 0x0001) === 0x0001;
    },
    /**
     * say if the file has utf-8 filename/comment.
     * @return {boolean} true if the filename/comment is in utf-8, false otherwise.
     */
    useUTF8: function() {
        // bit 11 is set
        return (this.bitFlag & 0x0800) === 0x0800;
    },
    /**
     * Prepare the function used to generate the compressed content from this ZipFile.
     * @param {DataReader} reader the reader to use.
     * @param {number} from the offset from where we should read the data.
     * @param {number} length the length of the data to read.
     * @return {Function} the callback to get the compressed content (the type depends of the DataReader class).
     */
    prepareCompressedContent: function(reader, from, length) {
        return function() {
            var previousIndex = reader.index;
            reader.setIndex(from);
            var compressedFileData = reader.readData(length);
            reader.setIndex(previousIndex);

            return compressedFileData;
        };
    },
    /**
     * Prepare the function used to generate the uncompressed content from this ZipFile.
     * @param {DataReader} reader the reader to use.
     * @param {number} from the offset from where we should read the data.
     * @param {number} length the length of the data to read.
     * @param {JSZip.compression} compression the compression used on this file.
     * @param {number} uncompressedSize the uncompressed size to expect.
     * @return {Function} the callback to get the uncompressed content (the type depends of the DataReader class).
     */
    prepareContent: function(reader, from, length, compression, uncompressedSize) {
        return function() {

            var compressedFileData = utils.transformTo(compression.uncompressInputType, this.getCompressedContent());
            var uncompressedFileData = compression.uncompress(compressedFileData);

            if (uncompressedFileData.length !== uncompressedSize) {
                throw new Error("Bug : uncompressed data size mismatch");
            }

            return uncompressedFileData;
        };
    },
    /**
     * Read the local part of a zip file and add the info in this object.
     * @param {DataReader} reader the reader to use.
     */
    readLocalPart: function(reader) {
        var compression, localExtraFieldsLength;

        // we already know everything from the central dir !
        // If the central dir data are false, we are doomed.
        // On the bright side, the local part is scary  : zip64, data descriptors, both, etc.
        // The less data we get here, the more reliable this should be.
        // Let's skip the whole header and dash to the data !
        reader.skip(22);
        // in some zip created on windows, the filename stored in the central dir contains \ instead of /.
        // Strangely, the filename here is OK.
        // I would love to treat these zip files as corrupted (see http://www.info-zip.org/FAQ.html#backslashes
        // or APPNOTE#4.4.17.1, "All slashes MUST be forward slashes '/'") but there are a lot of bad zip generators...
        // Search "unzip mismatching "local" filename continuing with "central" filename version" on
        // the internet.
        //
        // I think I see the logic here : the central directory is used to display
        // content and the local directory is used to extract the files. Mixing / and \
        // may be used to display \ to windows users and use / when extracting the files.
        // Unfortunately, this lead also to some issues : http://seclists.org/fulldisclosure/2009/Sep/394
        this.fileNameLength = reader.readInt(2);
        localExtraFieldsLength = reader.readInt(2); // can't be sure this will be the same as the central dir
        this.fileName = reader.readString(this.fileNameLength);
        reader.skip(localExtraFieldsLength);

        if (this.compressedSize == -1 || this.uncompressedSize == -1) {
            throw new Error("Bug or corrupted zip : didn't get enough informations from the central directory " + "(compressedSize == -1 || uncompressedSize == -1)");
        }

        compression = utils.findCompression(this.compressionMethod);
        if (compression === null) { // no compression found
            throw new Error("Corrupted zip : compression " + utils.pretty(this.compressionMethod) + " unknown (inner file : " + this.fileName + ")");
        }
        this.decompressed = new CompressedObject();
        this.decompressed.compressedSize = this.compressedSize;
        this.decompressed.uncompressedSize = this.uncompressedSize;
        this.decompressed.crc32 = this.crc32;
        this.decompressed.compressionMethod = this.compressionMethod;
        this.decompressed.getCompressedContent = this.prepareCompressedContent(reader, reader.index, this.compressedSize, compression);
        this.decompressed.getContent = this.prepareContent(reader, reader.index, this.compressedSize, compression, this.uncompressedSize);

        // we need to compute the crc32...
        if (this.loadOptions.checkCRC32) {
            this.decompressed = utils.transformTo("string", this.decompressed.getContent());
            if (jszipProto.crc32(this.decompressed) !== this.crc32) {
                throw new Error("Corrupted zip : CRC32 mismatch");
            }
        }
    },

    /**
     * Read the central part of a zip file and add the info in this object.
     * @param {DataReader} reader the reader to use.
     */
    readCentralPart: function(reader) {
        this.versionMadeBy = reader.readInt(2);
        this.versionNeeded = reader.readInt(2);
        this.bitFlag = reader.readInt(2);
        this.compressionMethod = reader.readString(2);
        this.date = reader.readDate();
        this.crc32 = reader.readInt(4);
        this.compressedSize = reader.readInt(4);
        this.uncompressedSize = reader.readInt(4);
        this.fileNameLength = reader.readInt(2);
        this.extraFieldsLength = reader.readInt(2);
        this.fileCommentLength = reader.readInt(2);
        this.diskNumberStart = reader.readInt(2);
        this.internalFileAttributes = reader.readInt(2);
        this.externalFileAttributes = reader.readInt(4);
        this.localHeaderOffset = reader.readInt(4);

        if (this.isEncrypted()) {
            throw new Error("Encrypted zip are not supported");
        }

        this.fileName = reader.readString(this.fileNameLength);
        this.readExtraFields(reader);
        this.parseZIP64ExtraField(reader);
        this.fileComment = reader.readString(this.fileCommentLength);
    },

    /**
     * Parse the external file attributes and get the unix/dos permissions.
     */
    processAttributes: function () {
        this.unixPermissions = null;
        this.dosPermissions = null;
        var madeBy = this.versionMadeBy >> 8;

        // Check if we have the DOS directory flag set.
        // We look for it in the DOS and UNIX permissions
        // but some unknown platform could set it as a compatibility flag.
        this.dir = this.externalFileAttributes & 0x0010 ? true : false;

        if(madeBy === MADE_BY_DOS) {
            // first 6 bits (0 to 5)
            this.dosPermissions = this.externalFileAttributes & 0x3F;
        }

        if(madeBy === MADE_BY_UNIX) {
            this.unixPermissions = (this.externalFileAttributes >> 16) & 0xFFFF;
            // the octal permissions are in (this.unixPermissions & 0x01FF).toString(8);
        }

        // fail safe : if the name ends with a / it probably means a folder
        if (!this.dir && this.fileName.slice(-1) === '/') {
            this.dir = true;
        }
    },

    /**
     * Parse the ZIP64 extra field and merge the info in the current ZipEntry.
     * @param {DataReader} reader the reader to use.
     */
    parseZIP64ExtraField: function(reader) {

        if (!this.extraFields[0x0001]) {
            return;
        }

        // should be something, preparing the extra reader
        var extraReader = new StringReader(this.extraFields[0x0001].value);

        // I really hope that these 64bits integer can fit in 32 bits integer, because js
        // won't let us have more.
        if (this.uncompressedSize === utils.MAX_VALUE_32BITS) {
            this.uncompressedSize = extraReader.readInt(8);
        }
        if (this.compressedSize === utils.MAX_VALUE_32BITS) {
            this.compressedSize = extraReader.readInt(8);
        }
        if (this.localHeaderOffset === utils.MAX_VALUE_32BITS) {
            this.localHeaderOffset = extraReader.readInt(8);
        }
        if (this.diskNumberStart === utils.MAX_VALUE_32BITS) {
            this.diskNumberStart = extraReader.readInt(4);
        }
    },
    /**
     * Read the central part of a zip file and add the info in this object.
     * @param {DataReader} reader the reader to use.
     */
    readExtraFields: function(reader) {
        var start = reader.index,
            extraFieldId,
            extraFieldLength,
            extraFieldValue;

        this.extraFields = this.extraFields || {};

        while (reader.index < start + this.extraFieldsLength) {
            extraFieldId = reader.readInt(2);
            extraFieldLength = reader.readInt(2);
            extraFieldValue = reader.readString(extraFieldLength);

            this.extraFields[extraFieldId] = {
                id: extraFieldId,
                length: extraFieldLength,
                value: extraFieldValue
            };
        }
    },
    /**
     * Apply an UTF8 transformation if needed.
     */
    handleUTF8: function() {
        if (this.useUTF8()) {
            this.fileName = jszipProto.utf8decode(this.fileName);
            this.fileComment = jszipProto.utf8decode(this.fileComment);
        } else {
            var upath = this.findExtraFieldUnicodePath();
            if (upath !== null) {
                this.fileName = upath;
            }
            var ucomment = this.findExtraFieldUnicodeComment();
            if (ucomment !== null) {
                this.fileComment = ucomment;
            }
        }
    },

    /**
     * Find the unicode path declared in the extra field, if any.
     * @return {String} the unicode path, null otherwise.
     */
    findExtraFieldUnicodePath: function() {
        var upathField = this.extraFields[0x7075];
        if (upathField) {
            var extraReader = new StringReader(upathField.value);

            // wrong version
            if (extraReader.readInt(1) !== 1) {
                return null;
            }

            // the crc of the filename changed, this field is out of date.
            if (jszipProto.crc32(this.fileName) !== extraReader.readInt(4)) {
                return null;
            }

            return jszipProto.utf8decode(extraReader.readString(upathField.length - 5));
        }
        return null;
    },

    /**
     * Find the unicode comment declared in the extra field, if any.
     * @return {String} the unicode comment, null otherwise.
     */
    findExtraFieldUnicodeComment: function() {
        var ucommentField = this.extraFields[0x6375];
        if (ucommentField) {
            var extraReader = new StringReader(ucommentField.value);

            // wrong version
            if (extraReader.readInt(1) !== 1) {
                return null;
            }

            // the crc of the comment changed, this field is out of date.
            if (jszipProto.crc32(this.fileComment) !== extraReader.readInt(4)) {
                return null;
            }

            return jszipProto.utf8decode(extraReader.readString(ucommentField.length - 5));
        }
        return null;
    }
};
module.exports = ZipEntry;