package client

import (
	"context"
	"fmt"

	v2container "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/container"
	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
	rpcapi "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc"
	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client"
	v2session "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/signature"
	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
)

// PrmContainerEACL groups parameters of ContainerEACL operation.
type PrmContainerEACL struct {
	prmCommonMeta

	idSet bool
	id    cid.ID
}

// SetContainer sets identifier of the FrostFS container to read the eACL table.
// Required parameter.
func (x *PrmContainerEACL) SetContainer(id cid.ID) {
	x.id = id
	x.idSet = true
}

func (x *PrmContainerEACL) formRequest(c *Client) (*v2container.GetExtendedACLRequest, error) {
	if !x.idSet {
		return nil, errorMissingContainer
	}

	var cidV2 refs.ContainerID
	x.id.WriteToV2(&cidV2)

	reqBody := new(v2container.GetExtendedACLRequestBody)
	reqBody.SetContainerID(&cidV2)

	var req v2container.GetExtendedACLRequest
	req.SetBody(reqBody)
	c.prepareRequest(&req, new(v2session.RequestMetaHeader))
	return &req, nil
}

// ResContainerEACL groups resulting values of ContainerEACL operation.
type ResContainerEACL struct {
	statusRes

	table eacl.Table
}

// Table returns eACL table of the requested container.
func (x ResContainerEACL) Table() eacl.Table {
	return x.table
}

// ContainerEACL reads eACL table of the FrostFS container.
//
// Exactly one return value is non-nil. By default, server status is returned in res structure.
// Any client's internal or transport errors are returned as `error`.
// If PrmInit.ResolveFrostFSFailures has been called, unsuccessful
// FrostFS status codes are returned as `error`, otherwise, are included
// in the returned result structure.
//
// Returns an error if parameters are set incorrectly (see PrmContainerEACL docs).
// Context is required and must not be nil. It is used for network communication.
//
// Return statuses:
//   - global (see Client docs);
//   - *apistatus.ContainerNotFound;
//   - *apistatus.EACLNotFound.
func (c *Client) ContainerEACL(ctx context.Context, prm PrmContainerEACL) (*ResContainerEACL, error) {
	req, err := prm.formRequest(c)
	if err != nil {
		return nil, err
	}

	if err := signature.SignServiceMessage(&c.prm.key, req); err != nil {
		return nil, fmt.Errorf("sign request: %w", err)
	}

	resp, err := rpcapi.GetEACL(&c.c, req, client.WithContext(ctx))
	if err != nil {
		return nil, err
	}

	var res ResContainerEACL
	res.st, err = c.processResponse(resp)
	if err != nil || !apistatus.IsSuccessful(res.st) {
		return &res, err
	}

	eACL := resp.GetBody().GetEACL()
	if eACL == nil {
		return &res, newErrMissingResponseField("eACL")
	}

	res.table = *eacl.NewTableFromV2(eACL)
	return &res, nil
}