/*
 * MinIO Cloud Storage, (C) 2015, 2016, 2017, 2018 MinIO, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cmd

import (
	"encoding/base64"
	"net/url"
	"strconv"
)

// Parse bucket url queries
func getListObjectsV1Args(values url.Values) (prefix, marker, delimiter string, maxkeys int, encodingType string, errCode APIErrorCode) {
	errCode = ErrNone

	if values.Get("max-keys") != "" {
		var err error
		if maxkeys, err = strconv.Atoi(values.Get("max-keys")); err != nil {
			errCode = ErrInvalidMaxKeys
			return
		}
	} else {
		maxkeys = maxObjectList
	}

	prefix = trimLeadingSlash(values.Get("prefix"))
	marker = trimLeadingSlash(values.Get("marker"))
	delimiter = values.Get("delimiter")
	encodingType = values.Get("encoding-type")
	return
}

func getListBucketObjectVersionsArgs(values url.Values) (prefix, marker, delimiter string, maxkeys int, encodingType, versionIDMarker string, errCode APIErrorCode) {
	errCode = ErrNone

	if values.Get("max-keys") != "" {
		var err error
		if maxkeys, err = strconv.Atoi(values.Get("max-keys")); err != nil {
			errCode = ErrInvalidMaxKeys
			return
		}
	} else {
		maxkeys = maxObjectList
	}

	prefix = trimLeadingSlash(values.Get("prefix"))
	marker = trimLeadingSlash(values.Get("key-marker"))
	delimiter = values.Get("delimiter")
	encodingType = values.Get("encoding-type")
	versionIDMarker = values.Get("version-id-marker")
	return
}

// Parse bucket url queries for ListObjects V2.
func getListObjectsV2Args(values url.Values) (prefix, token, startAfter, delimiter string, fetchOwner bool, maxkeys int, encodingType string, errCode APIErrorCode) {
	errCode = ErrNone

	// The continuation-token cannot be empty.
	if val, ok := values["continuation-token"]; ok {
		if len(val[0]) == 0 {
			errCode = ErrIncorrectContinuationToken
			return
		}
	}

	if values.Get("max-keys") != "" {
		var err error
		if maxkeys, err = strconv.Atoi(values.Get("max-keys")); err != nil {
			errCode = ErrInvalidMaxKeys
			return
		}
	} else {
		maxkeys = maxObjectList
	}

	prefix = trimLeadingSlash(values.Get("prefix"))
	startAfter = trimLeadingSlash(values.Get("start-after"))
	delimiter = values.Get("delimiter")
	fetchOwner = values.Get("fetch-owner") == "true"
	encodingType = values.Get("encoding-type")

	if token = values.Get("continuation-token"); token != "" {
		decodedToken, err := base64.StdEncoding.DecodeString(token)
		if err != nil {
			errCode = ErrIncorrectContinuationToken
			return
		}
		token = string(decodedToken)
	}
	return
}

// Parse bucket url queries for ?uploads
func getBucketMultipartResources(values url.Values) (prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int, encodingType string, errCode APIErrorCode) {
	errCode = ErrNone

	if values.Get("max-uploads") != "" {
		var err error
		if maxUploads, err = strconv.Atoi(values.Get("max-uploads")); err != nil {
			errCode = ErrInvalidMaxUploads
			return
		}
	} else {
		maxUploads = maxUploadsList
	}

	prefix = trimLeadingSlash(values.Get("prefix"))
	keyMarker = trimLeadingSlash(values.Get("key-marker"))
	uploadIDMarker = values.Get("upload-id-marker")
	delimiter = values.Get("delimiter")
	encodingType = values.Get("encoding-type")
	return
}

// Parse object url queries
func getObjectResources(values url.Values) (uploadID string, partNumberMarker, maxParts int, encodingType string, errCode APIErrorCode) {
	var err error
	errCode = ErrNone

	if values.Get("max-parts") != "" {
		if maxParts, err = strconv.Atoi(values.Get("max-parts")); err != nil {
			errCode = ErrInvalidMaxParts
			return
		}
	} else {
		maxParts = maxPartsList
	}

	if values.Get("part-number-marker") != "" {
		if partNumberMarker, err = strconv.Atoi(values.Get("part-number-marker")); err != nil {
			errCode = ErrInvalidPartNumberMarker
			return
		}
	}

	uploadID = values.Get("uploadId")
	encodingType = values.Get("encoding-type")
	return
}
