package ops2

import (
	"fmt"

	clitypes "gitlink.org.cn/cloudream/jcs-pub/client/types"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/ioswitch/dag"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/ioswitch/exec"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/storage/pool"
)

func init() {
	exec.UseOp[*S2STransfer]()
	exec.UseOp[*S2STransferDyn]()
}

type S2STransfer struct {
	SrcSpace clitypes.UserSpaceDetail
	SrcPath  clitypes.JPath
	DstSpace clitypes.UserSpaceDetail
	DstPath  clitypes.JPath
	Output   exec.VarID
}

func (o *S2STransfer) Execute(ctx *exec.ExecContext, e *exec.Executor) error {
	stgPool, err := exec.GetValueByType[*pool.Pool](ctx)
	if err != nil {
		return fmt.Errorf("getting storage pool: %w", err)
	}

	s2s, err := stgPool.GetS2STransfer(&o.DstSpace)
	if err != nil {
		return err
	}

	// 传输文件
	fileInfo, err := s2s.Transfer(ctx.Context, &o.SrcSpace, o.SrcPath, o.DstPath)
	if err != nil {
		return err
	}
	defer s2s.Close()

	// 告知后续Op处理临时文件
	e.PutVar(o.Output, &FileInfoValue{FileInfo: fileInfo})
	return nil
}

func (o *S2STransfer) String() string {
	return fmt.Sprintf("S2STransfer %v:%v -> %v:%v, %v",
		o.SrcSpace.UserSpace.Storage.String(),
		o.SrcPath,
		o.DstSpace.UserSpace.Storage.String(),
		o.DstPath,
		o.Output)
}

type S2STransferDyn struct {
	SrcSpace    clitypes.UserSpaceDetail
	SrcFileInfo exec.VarID
	DstSpace    clitypes.UserSpaceDetail
	DstPath     clitypes.JPath
	Output      exec.VarID
}

func (o *S2STransferDyn) Execute(ctx *exec.ExecContext, e *exec.Executor) error {
	stgPool, err := exec.GetValueByType[*pool.Pool](ctx)
	if err != nil {
		return fmt.Errorf("getting storage pool: %w", err)
	}

	srcInfo, err := exec.BindVar[*FileInfoValue](e, ctx.Context, o.SrcFileInfo)
	if err != nil {
		return err
	}

	s2s, err := stgPool.GetS2STransfer(&o.DstSpace)
	if err != nil {
		return err
	}

	// 传输文件
	fileInfo, err := s2s.Transfer(ctx.Context, &o.SrcSpace, srcInfo.Path, o.DstPath)
	if err != nil {
		return err
	}
	defer s2s.Close()

	// 告知后续Op处理临时文件
	e.PutVar(o.Output, &FileInfoValue{FileInfo: fileInfo})
	return nil
}

func (o *S2STransferDyn) String() string {
	return fmt.Sprintf("S2STransferDyn %v:%v -> %v:%v, %v",
		o.SrcSpace.UserSpace.Storage.String(),
		o.SrcFileInfo,
		o.DstSpace.UserSpace.Storage.String(),
		o.DstPath,
		o.Output)
}

type S2STransferNode struct {
	dag.NodeBase
	SrcSpace clitypes.UserSpaceDetail
	SrcPath  clitypes.JPath
	DstSpace clitypes.UserSpaceDetail
	DstPath  clitypes.JPath
}

func (b *GraphNodeBuilder) NewS2STransfer(srcSpace clitypes.UserSpaceDetail, srcPath clitypes.JPath, dstSpace clitypes.UserSpaceDetail, dstPath clitypes.JPath) *S2STransferNode {
	n := &S2STransferNode{
		SrcSpace: srcSpace,
		SrcPath:  srcPath,
		DstSpace: dstSpace,
		DstPath:  dstPath,
	}
	b.AddNode(n)

	n.OutputValues().Init(n, 1)
	return n
}

func (n *S2STransferNode) FileInfoVar() dag.ValueOutputSlot {
	return dag.ValueOutputSlot{
		Node:  n,
		Index: 0,
	}
}

func (n *S2STransferNode) GenerateOp() (exec.Op, error) {
	return &S2STransfer{
		SrcSpace: n.SrcSpace,
		SrcPath:  n.SrcPath,
		DstSpace: n.DstSpace,
		DstPath:  n.DstPath,
		Output:   n.FileInfoVar().Var().VarID,
	}, nil
}

type S2STransferDynNode struct {
	dag.NodeBase
	SrcSpace clitypes.UserSpaceDetail
	DstSpace clitypes.UserSpaceDetail
	DstPath  clitypes.JPath
}

func (b *GraphNodeBuilder) NewS2STransferDyn(srcSpace clitypes.UserSpaceDetail, dstSpace clitypes.UserSpaceDetail, dstPath clitypes.JPath) *S2STransferDynNode {
	n := &S2STransferDynNode{
		SrcSpace: srcSpace,
		DstSpace: dstSpace,
		DstPath:  dstPath,
	}
	b.AddNode(n)

	n.InputValues().Init(1)
	n.OutputValues().Init(n, 1)
	return n
}

func (n *S2STransferDynNode) SrcFileInfoSlot() dag.ValueInputSlot {
	return dag.ValueInputSlot{
		Node:  n,
		Index: 0,
	}
}

func (n *S2STransferDynNode) FileInfoVar() dag.ValueOutputSlot {
	return dag.ValueOutputSlot{
		Node:  n,
		Index: 0,
	}
}

func (n *S2STransferDynNode) GenerateOp() (exec.Op, error) {
	return &S2STransferDyn{
		SrcSpace:    n.SrcSpace,
		SrcFileInfo: n.SrcFileInfoSlot().Var().VarID,
		DstSpace:    n.DstSpace,
		DstPath:     n.DstPath,
		Output:      n.FileInfoVar().Var().VarID,
	}, nil
}