var aws = require('aws-sdk');
var promise = require('bluebird');
var fs = promise.promisifyAll(require('fs'));

var awsConfig = {
    region: "aws.region",
    accessKeyId: "aws.accessKeyId",
    secretAccessKey: "aws.secretAccessKey",
    sslEnabled: true
};

var s3 = promise.promisifyAll(new aws.S3(awsConfig));

/**
 * @param {Object} data - required s3 properties regarding object
 * @param {String} data.path - absolute path of the object,
 * @param {String} data.name - name define object relative path, example: path/to/object.ext
 * @param {String} data.mimeType - aws require content type, provide
 * @param {String} [data.acl] - default permission is private
 * @param {String} bucketName - cache-control max age in days
 * @param {Number} [maxAge] - cache-control max age in days
 * @returns {promise} - checksum
 */
function uploadObject(data, bucketName, maxAge){
    return fs.readFileAsync(data.path)
    .then(function(buffer){
        if(data.mimeType){
            var params = {};
            params.Bucket = bucketName;
            params.Body = buffer;
            params.Key = data.name;
            params.ContentType = data.mimeType;
            params.ACL = data.acl || 'private';
            params.StorageClass = 'STANDARD';
            if(maxAge) params.CacheControl = 'max-age=' + (3600 * 24 * maxAge);
            return s3.putObjectAsync(params);
        } else
          throw new Error('mime type is mandatory');
    }).then(function(checksum){
        return checksum;
    }).catch(function(err){
        console.log("Error in CDN file upload, ", data.path, err);
        return err;
    });

}



module.exports = {
    uploadObject: uploadObject
};