package services

import (
	"context"
	"errors"
	"fmt"

	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/tokens"
	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/tree"
	treepool "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree"
	grpcService "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree/service"
)

type GetNodeByPathResponseInfoWrapper struct {
	response *grpcService.GetNodeByPathResponse_Info
}

func (n GetNodeByPathResponseInfoWrapper) GetNodeID() uint64 {
	return n.response.GetNodeId()
}

func (n GetNodeByPathResponseInfoWrapper) GetParentID() uint64 {
	return n.response.GetParentId()
}

func (n GetNodeByPathResponseInfoWrapper) GetTimestamp() uint64 {
	return n.response.GetTimestamp()
}

func (n GetNodeByPathResponseInfoWrapper) GetMeta() []tree.Meta {
	res := make([]tree.Meta, len(n.response.Meta))
	for i, value := range n.response.Meta {
		res[i] = value
	}
	return res
}

type PoolWrapper struct {
	p *treepool.Pool
}

func NewPoolWrapper(p *treepool.Pool) *PoolWrapper {
	return &PoolWrapper{p: p}
}

func (w *PoolWrapper) GetNodes(ctx context.Context, prm *tree.GetNodesParams) ([]tree.NodeResponse, error) {
	poolPrm := treepool.GetNodesParams{
		CID:           prm.CnrID,
		TreeID:        prm.TreeID,
		Path:          prm.Path,
		Meta:          prm.Meta,
		PathAttribute: tree.FileNameKey,
		LatestOnly:    prm.LatestOnly,
		AllAttrs:      prm.AllAttrs,
		BearerToken:   getBearer(ctx),
	}

	nodes, err := w.p.GetNodes(ctx, poolPrm)
	if err != nil {
		return nil, handleError(err)
	}

	res := make([]tree.NodeResponse, len(nodes))
	for i, info := range nodes {
		res[i] = GetNodeByPathResponseInfoWrapper{info}
	}

	return res, nil
}

func getBearer(ctx context.Context) []byte {
	token, err := tokens.LoadBearerToken(ctx)
	if err != nil {
		return nil
	}
	return token.Marshal()
}

func handleError(err error) error {
	if err == nil {
		return nil
	}
	if errors.Is(err, treepool.ErrNodeNotFound) {
		return fmt.Errorf("%w: %s", tree.ErrNodeNotFound, err.Error())
	}
	if errors.Is(err, treepool.ErrNodeAccessDenied) {
		return fmt.Errorf("%w: %s", tree.ErrNodeAccessDenied, err.Error())
	}

	return err
}