package client

import (
	"context"
	"fmt"

	v2container "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/container"
	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"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
)

// PrmAnnounceSpace groups parameters of ContainerAnnounceUsedSpace operation.
type PrmAnnounceSpace struct {
	prmCommonMeta

	announcements []container.SizeEstimation
}

// SetValues sets values describing volume of space that is used for the container objects.
// Required parameter. Must not be empty.
//
// Must not be mutated before the end of the operation.
func (x *PrmAnnounceSpace) SetValues(vs []container.SizeEstimation) {
	x.announcements = vs
}

func (x *PrmAnnounceSpace) formRequest(c *Client) (*v2container.AnnounceUsedSpaceRequest, error) {
	if len(x.announcements) == 0 {
		return nil, errorMissingAnnouncements
	}

	v2announce := make([]v2container.UsedSpaceAnnouncement, len(x.announcements))
	for i := range x.announcements {
		x.announcements[i].WriteToV2(&v2announce[i])
	}

	reqBody := new(v2container.AnnounceUsedSpaceRequestBody)
	reqBody.SetAnnouncements(v2announce)

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

// ResAnnounceSpace groups resulting values of ContainerAnnounceUsedSpace operation.
type ResAnnounceSpace struct {
	statusRes
}

// ContainerAnnounceUsedSpace sends request to announce volume of the space used for the container objects.
//
// 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.
//
// Operation is asynchronous and no guaranteed even in the absence of errors.
// The required time is also not predictable.
//
// At this moment success can not be checked.
//
// Returns an error if parameters are set incorrectly (see PrmAnnounceSpace docs).
// Context is required and must not be nil. It is used for network communication.
//
// Return statuses:
//   - global (see Client docs).
func (c *Client) ContainerAnnounceUsedSpace(ctx context.Context, prm PrmAnnounceSpace) (*ResAnnounceSpace, 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.AnnounceUsedSpace(&c.c, req, client.WithContext(ctx))
	if err != nil {
		return nil, err
	}

	var res ResAnnounceSpace
	res.st, err = c.processResponse(resp)
	return &res, err
}