// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"context"
	"io"
	"net/http"
	"os"
	"time"

	"github.com/minio/mc/pkg/probe"
	minio "github.com/minio/minio-go/v7"
	"github.com/minio/minio-go/v7/pkg/encrypt"
	"github.com/minio/minio-go/v7/pkg/lifecycle"
	"github.com/minio/minio-go/v7/pkg/replication"
)

// DirOpt - list directory option.
type DirOpt int8

const (
	// DirNone - do not include directories in the list.
	DirNone DirOpt = iota
	// DirFirst - include directories before objects in the list.
	DirFirst
	// DirLast - include directories after objects in the list.
	DirLast
)

// GetOptions holds options of the GET operation
type GetOptions struct {
	SSE       encrypt.ServerSide
	VersionID string
}

// PutOptions holds options for PUT operation
type PutOptions struct {
	metadata              map[string]string
	sse                   encrypt.ServerSide
	md5, disableMultipart bool
	isPreserve            bool
	storageClass          string
	multipartSize         uint64
	multipartThreads      uint
}

// StatOptions holds options of the HEAD operation
type StatOptions struct {
	incomplete bool
	preserve   bool
	sse        encrypt.ServerSide
	timeRef    time.Time
	versionID  string
}

// ListOptions holds options for listing operation
type ListOptions struct {
	Recursive         bool
	Incomplete        bool
	WithMetadata      bool
	WithOlderVersions bool
	WithDeleteMarkers bool
	TimeRef           time.Time
	ShowDir           DirOpt
	Count             int
}

// CopyOptions holds options for copying operation
type CopyOptions struct {
	versionID        string
	size             int64
	srcSSE, tgtSSE   encrypt.ServerSide
	metadata         map[string]string
	disableMultipart bool
	isPreserve       bool
	storageClass     string
}

// Client - client interface
type Client interface {
	// Common operations
	Stat(ctx context.Context, opts StatOptions) (content *ClientContent, err *probe.Error)

	List(ctx context.Context, opts ListOptions) <-chan *ClientContent

	// Bucket operations
	MakeBucket(ctx context.Context, region string, ignoreExisting, withLock bool) *probe.Error
	RemoveBucket(ctx context.Context, forceRemove bool) *probe.Error

	// Object lock config
	SetObjectLockConfig(ctx context.Context, mode minio.RetentionMode, validity uint64, unit minio.ValidityUnit) *probe.Error
	GetObjectLockConfig(ctx context.Context) (status string, mode minio.RetentionMode, validity uint64, unit minio.ValidityUnit, perr *probe.Error)

	// Access policy operations.
	GetAccess(ctx context.Context) (access string, policyJSON string, error *probe.Error)
	GetAccessRules(ctx context.Context) (policyRules map[string]string, error *probe.Error)
	SetAccess(ctx context.Context, access string, isJSON bool) *probe.Error

	// I/O operations
	Copy(ctx context.Context, source string, opts CopyOptions, progress io.Reader) *probe.Error

	// Runs select expression on object storage on specific files.
	Select(ctx context.Context, expression string, sse encrypt.ServerSide, opts SelectObjectOpts) (io.ReadCloser, *probe.Error)

	// I/O operations with metadata.
	Get(ctx context.Context, opts GetOptions) (reader io.ReadCloser, err *probe.Error)

	Put(ctx context.Context, reader io.Reader, size int64, progress io.Reader, opts PutOptions) (n int64, err *probe.Error)

	// Object Locking related API
	PutObjectRetention(ctx context.Context, versionID string, mode minio.RetentionMode, retainUntilDate time.Time, bypassGovernance bool) *probe.Error
	GetObjectRetention(ctx context.Context, versionID string) (minio.RetentionMode, time.Time, *probe.Error)
	PutObjectLegalHold(ctx context.Context, versionID string, hold minio.LegalHoldStatus) *probe.Error
	GetObjectLegalHold(ctx context.Context, versionID string) (minio.LegalHoldStatus, *probe.Error)

	// I/O operations with expiration
	ShareDownload(ctx context.Context, versionID string, expires time.Duration) (string, *probe.Error)
	ShareUpload(context.Context, bool, time.Duration, string) (string, map[string]string, *probe.Error)

	// Watch events
	Watch(ctx context.Context, options WatchOptions) (*WatchObject, *probe.Error)

	// Delete operations
	Remove(ctx context.Context, isIncomplete, isRemoveBucket, isBypass bool, contentCh <-chan *ClientContent) (errorCh <-chan *probe.Error)
	// GetURL returns back internal url
	GetURL() ClientURL

	AddUserAgent(app, version string)

	// Tagging operations
	GetTags(ctx context.Context, versionID string) (map[string]string, *probe.Error)
	SetTags(ctx context.Context, versionID, tags string) *probe.Error
	DeleteTags(ctx context.Context, versionID string) *probe.Error

	// Lifecycle operations
	GetLifecycle(ctx context.Context) (*lifecycle.Configuration, *probe.Error)
	SetLifecycle(ctx context.Context, config *lifecycle.Configuration) *probe.Error

	// Versioning operations
	GetVersion(ctx context.Context) (minio.BucketVersioningConfiguration, *probe.Error)
	SetVersion(ctx context.Context, status string) *probe.Error
	// Replication operations
	GetReplication(ctx context.Context) (replication.Config, *probe.Error)
	SetReplication(ctx context.Context, cfg *replication.Config, opts replication.Options) *probe.Error
	RemoveReplication(ctx context.Context) *probe.Error
	GetReplicationMetrics(ctx context.Context) (replication.Metrics, *probe.Error)
	ResetReplication(ctx context.Context, before time.Duration, arn string) (replication.ResyncTargetsInfo, *probe.Error)
	// Encryption operations
	GetEncryption(ctx context.Context) (string, string, *probe.Error)
	SetEncryption(ctx context.Context, algorithm, kmsKeyID string) *probe.Error
	DeleteEncryption(ctx context.Context) *probe.Error
	// Bucket info operation
	GetBucketInfo(ctx context.Context) (BucketInfo, *probe.Error)
}

// ClientContent - Content container for content metadata
type ClientContent struct {
	URL          ClientURL
	Time         time.Time
	Size         int64
	Type         os.FileMode
	StorageClass string
	Metadata     map[string]string
	UserMetadata map[string]string
	ETag         string
	Expires      time.Time

	Expiration       time.Time
	ExpirationRuleID string

	RetentionEnabled  bool
	RetentionMode     string
	RetentionDuration string
	BypassGovernance  bool
	LegalHoldEnabled  bool
	LegalHold         string
	VersionID         string
	IsDeleteMarker    bool
	IsLatest          bool
	ReplicationStatus string
	Err               *probe.Error
}

// Config - see http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?RESTAuthentication.html
type Config struct {
	AccessKey    string
	SecretKey    string
	SessionToken string
	Signature    string
	HostURL      string
	AppName      string
	AppVersion   string
	Debug        bool
	Insecure     bool
	Lookup       minio.BucketLookupType
	Transport    *http.Transport
}

// SelectObjectOpts - opts entered for select API
type SelectObjectOpts struct {
	InputSerOpts    map[string]map[string]string
	OutputSerOpts   map[string]map[string]string
	CompressionType minio.SelectCompressionType
}