var EEPROM = function(srcId, endpoint, authorization) {
    this.srcId = parseInt(srcId);
    this.setEndpoint(endpoint);
    this.setAuthorization(authorization);
};
EEPROM.prototype.setEndpoint = function(endpoint) {
    this.endpoint = endpoint.toString();
};
EEPROM.prototype.setAuthorization = function(authorization) {
    this.authorization = authorization.toString();
};
EEPROM.prototype.deleteUpload = function(fileInfo) {
    return new EEPROM.EEPROMDeleteTask(
        this.authorization,
        fileInfo
    );
};
EEPROM.prototype.createUpload = function(file) {
    return new EEPROM.EEPROMUploadTask(
        this.srcId,
        this.endpoint,
        this.authorization,
        file
    );
};
EEPROM.ERR_GENERIC = 'generic'; // Generic error, no further details
EEPROM.ERR_INVALID = 'invalid'; // Request is invalid
EEPROM.ERR_AUTH = 'auth'; // Auth token expired
EEPROM.ERR_ACCESS = 'access'; // Barred from uploading
EEPROM.ERR_DMCA = 'dmca'; // DMCA takedown
EEPROM.ERR_GONE = 'gone'; // Invalid endpoint
EEPROM.ERR_SERVER = 'server'; // Server error
EEPROM.ERR_SIZE = 'size'; // Too large

EEPROM.EEPROMFile = function(fileInfo) {
    // A merge operation woulda been neat.
    this.id = (fileInfo.id || '').toString();
    this.url = (fileInfo.url || '').toString();
    this.urlf = (fileInfo.urlf || '').toString();
    this.thumb = (fileInfo.thumb || '').toString();
    this.name = (fileInfo.name || '').toString();
    this.type = (fileInfo.type || '').toString();
    this.size = parseInt(fileInfo.size || 0);
    this.user = parseInt(fileInfo.user || 0);
    this.hash = (fileInfo.hash || '').toString();
    this.created = (fileInfo.created || null);
    this.accessed = (fileInfo.accessed || null);
    this.expires = (fileInfo.expires || null);
    this.deleted = (fileInfo.deleted || null);
    this.dmca = (fileInfo.dmca || null);
};
EEPROM.EEPROMFile.prototype.isImage = function() { return this.type.indexOf('image/') === 0; };
EEPROM.EEPROMFile.prototype.isAudio = function() { return this.type.indexOf('audio/') === 0; };
EEPROM.EEPROMFile.prototype.isVideo = function() { return this.type.indexOf('video/') === 0; };

EEPROM.EEPROMDeleteTask = function(authorization, fileInfo) {
    var _self = this;
    this.authorization = authorization;
    this.fileInfo = fileInfo;
    this.xhr = new XMLHttpRequest;
    this.xhr.addEventListener('readystatechange', function() {
        if(this.readyState !== 4)
            return;

        if(this.status !== 204) {
            _self.errorCode = EEPROM.ERR_GENERIC;

            switch(this.status) {
                case 401:
                    _self.errorCode = EEPROM.ERR_AUTH;
                    break;
                case 403:
                    _self.errorCode = EEPROM.ERR_ACCESS;
                    break;
                case 404:
                case 410:
                    _self.errorCode = EEPROM.ERR_GONE;
                    break;
                case 500:
                case 503:
                    _self.errorCode = EEPROM.ERR_SERVER;
                    break;
            }

            if(_self.onFailure)
                _self.onFailure(_self.errorCode);
            return;
        }

        if(_self.onSuccess)
            _self.onSuccess();
    });
};
EEPROM.EEPROMDeleteTask.prototype.onSuccess = undefined;
EEPROM.EEPROMDeleteTask.prototype.onFailure = undefined;
EEPROM.EEPROMDeleteTask.prototype.start = function() {
    this.xhr.open('DELETE', this.fileInfo.urlf);
    this.xhr.setRequestHeader('Authorization', this.authorization);
    this.xhr.send();
};

EEPROM.EEPROMUploadTask = function(srcId, endpoint, authorization, file) {
    var _self = this;

    this.aborted = false;
    this.endpoint = endpoint;
    this.authorization = authorization;
    this.xhr = new XMLHttpRequest;
    this.formData = new FormData;
    this.formData.append('src', srcId);
    this.formData.append('file', file);

    var reportUploadProgress = function(ev) {
        if(_self.onProgress)
            _self.onProgress(new EEPROM.EEPROMUploadTask.EEPROMUploadTaskProgress(ev.loaded, ev.total));
    };

    this.xhr.upload.addEventListener('loadstart', reportUploadProgress);
    this.xhr.upload.addEventListener('progress', reportUploadProgress);
    this.xhr.upload.addEventListener('load', reportUploadProgress);

    this.xhr.addEventListener('readystatechange', function() {
        if(this.readyState !== 4)
            return;

        if(this.status !== 201) {
            _self.failureResponse = {
                userAborted: _self.aborted,
                error: EEPROM.ERR_GENERIC,
            };

            switch(this.status) {
                case 400:
                case 405:
                    _self.failureResponse.error = EEPROM.ERR_INVALID;
                    break;
                case 401:
                    _self.failureResponse.error = EEPROM.ERR_AUTH;
                    break;
                case 403:
                    _self.failureResponse.error = EEPROM.ERR_ACCESS;
                    break;
                case 404:
                case 410:
                    _self.failureResponse.error = EEPROM.ERR_GONE;
                    break;
                case 451:
                    _self.failureResponse.error = EEPROM.ERR_DMCA;
                    break;
                case 413:
                    _self.failureResponse.error = EEPROM.ERR_SIZE;
                    _self.failureResponse.maxSize = parseInt(this.getResponseHeader('X-EEPROM-Max-Size'));
                    break;
                case 500:
                case 503:
                    _self.failureResponse.error = EEPROM.ERR_SERVER;
                    break;
            }

            if(_self.onFailure)
                _self.onFailure(_self.failureResponse);
            return;
        }

        _self.fileInfo = new EEPROM.EEPROMFile(JSON.parse(this.responseText));

        if(_self.onComplete)
            _self.onComplete(_self.fileInfo);
    });
};
EEPROM.EEPROMUploadTask.EEPROMUploadTaskProgress = function(loaded, total) {
    this.progress = Math.ceil(((this.loaded = loaded) / (this.total = total)) * 100);
};
EEPROM.EEPROMUploadTask.prototype.onComplete = undefined;
EEPROM.EEPROMUploadTask.prototype.onFailure = undefined;
EEPROM.EEPROMUploadTask.prototype.onProgress = undefined;
EEPROM.EEPROMUploadTask.prototype.abort = function() {
    this.aborted = true;
    this.xhr.abort();
};
EEPROM.EEPROMUploadTask.prototype.start = function() {
    this.xhr.open('POST', this.endpoint);
    this.xhr.setRequestHeader('Authorization', this.authorization);
    this.xhr.send(this.formData);
};