package ioswitch2

import (
	"gitlink.org.cn/cloudream/common/utils/math2"
	clitypes "gitlink.org.cn/cloudream/jcs-pub/client/types"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/ioswitch/exec"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/storage/types"
)

type From interface {
	GetStreamIndex() StreamIndex
}

type To interface {
	// To所需要的文件流的范围。具体含义与DataIndex有关系：
	// 如果DataIndex == -1，则表示在整个文件的范围。
	// 如果DataIndex >= 0，则表示在文件的某个分片的范围。
	GetRange() math2.Range
	GetStreamIndex() StreamIndex
}

const (
	// 未处理的完整文件流
	StreamIndexRaw = iota
	// EC编码的某一块的流
	StreamIndexEC
	// 分段编码的某一段的流
	StreamIndexSegment
)

type StreamIndex struct {
	Type  int
	Index int
}

func RawStream() StreamIndex {
	return StreamIndex{
		Type: StreamIndexRaw,
	}
}

func ECStream(index int) StreamIndex {
	return StreamIndex{
		Type:  StreamIndexEC,
		Index: index,
	}
}

func SegmentStream(index int) StreamIndex {
	return StreamIndex{
		Type:  StreamIndexSegment,
		Index: index,
	}
}

func (s StreamIndex) IsRaw() bool {
	return s.Type == StreamIndexRaw
}

func (s StreamIndex) IsEC() bool {
	return s.Type == StreamIndexEC
}

func (s StreamIndex) IsSegment() bool {
	return s.Type == StreamIndexSegment
}

type FromTos []FromTo

type FromTo struct {
	// 如果输入或者输出用到了EC编码的流，则需要提供EC参数。
	ECParam *clitypes.ECRedundancy
	// 同上
	SegmentParam *clitypes.SegmentRedundancy
	Froms        []From
	Toes         []To
}

func NewFromTo() FromTo {
	return FromTo{}
}

func (ft *FromTo) AddFrom(from From) *FromTo {
	ft.Froms = append(ft.Froms, from)
	return ft
}

func (ft *FromTo) AddTo(to To) *FromTo {
	ft.Toes = append(ft.Toes, to)
	return ft
}

type FromDriver struct {
	Handle      *exec.DriverWriteStream
	StreamIndex StreamIndex
}

func NewFromDriver(strIdx StreamIndex) (*FromDriver, *exec.DriverWriteStream) {
	handle := &exec.DriverWriteStream{
		RangeHint: &math2.Range{},
	}
	return &FromDriver{
		Handle:      handle,
		StreamIndex: strIdx,
	}, handle
}

func (f *FromDriver) GetStreamIndex() StreamIndex {
	return f.StreamIndex
}

type FromShardStore struct {
	FileHash    clitypes.FileHash
	UserSpace   clitypes.UserSpaceDetail
	StreamIndex StreamIndex
}

func NewFromShardstore(fileHash clitypes.FileHash, space clitypes.UserSpaceDetail, strIdx StreamIndex) *FromShardStore {
	return &FromShardStore{
		FileHash:    fileHash,
		UserSpace:   space,
		StreamIndex: strIdx,
	}
}

func (f *FromShardStore) GetStreamIndex() StreamIndex {
	return f.StreamIndex
}

type FromBaseStore struct {
	UserSpace clitypes.UserSpaceDetail
	Path      clitypes.JPath
}

func NewFromBaseStore(space clitypes.UserSpaceDetail, path clitypes.JPath) *FromBaseStore {
	return &FromBaseStore{
		UserSpace: space,
		Path:      path,
	}
}

func (f *FromBaseStore) GetStreamIndex() StreamIndex {
	return StreamIndex{
		Type: StreamIndexRaw,
	}
}

type ToDriver struct {
	Handle      *exec.DriverReadStream
	StreamIndex StreamIndex
	Range       math2.Range
}

func NewToDriver(strIdx StreamIndex) (*ToDriver, *exec.DriverReadStream) {
	str := exec.DriverReadStream{}
	return &ToDriver{
		Handle:      &str,
		StreamIndex: strIdx,
	}, &str
}

func NewToDriverWithRange(strIdx StreamIndex, rng math2.Range) (*ToDriver, *exec.DriverReadStream) {
	str := exec.DriverReadStream{}
	return &ToDriver{
		Handle:      &str,
		StreamIndex: strIdx,
		Range:       rng,
	}, &str
}

func (t *ToDriver) GetStreamIndex() StreamIndex {
	return t.StreamIndex
}

func (t *ToDriver) GetRange() math2.Range {
	return t.Range
}

type ToShardStore struct {
	UserSpace      clitypes.UserSpaceDetail
	StreamIndex    StreamIndex
	Range          math2.Range
	ResultStoreKey string
}

func NewToShardStore(space clitypes.UserSpaceDetail, strIdx StreamIndex, retStoreKey string) *ToShardStore {
	return &ToShardStore{
		UserSpace:      space,
		StreamIndex:    strIdx,
		ResultStoreKey: retStoreKey,
	}
}

func NewToShardStoreWithRange(space clitypes.UserSpaceDetail, streamIndex StreamIndex, retStoreKey string, rng math2.Range) *ToShardStore {
	return &ToShardStore{
		UserSpace:      space,
		StreamIndex:    streamIndex,
		ResultStoreKey: retStoreKey,
		Range:          rng,
	}
}

func (t *ToShardStore) GetStreamIndex() StreamIndex {
	return t.StreamIndex
}

func (t *ToShardStore) GetRange() math2.Range {
	return t.Range
}

type ToBaseStore struct {
	UserSpace  clitypes.UserSpaceDetail
	ObjectPath clitypes.JPath
	Option     types.WriteOption
}

func NewToBaseStore(space clitypes.UserSpaceDetail, objectPath clitypes.JPath) *ToBaseStore {
	return &ToBaseStore{
		UserSpace:  space,
		ObjectPath: objectPath,
	}
}

func (t *ToBaseStore) GetStreamIndex() StreamIndex {
	return StreamIndex{
		Type: StreamIndexRaw,
	}
}

func (t *ToBaseStore) GetRange() math2.Range {
	return math2.Range{}
}