package client

import (
	"context"
	"errors"
	"fmt"

	containergrpc "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/container/grpc"
	refsgrpc "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs/grpc"
	rpcapi "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc"
	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client"
	sessiongrpc "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session/grpc"
	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/signature"
	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
)

// PrmContainerGet groups parameters of ContainerGet operation.
type PrmContainerGet struct {
	prmCommonMeta

	idSet bool
	id    cid.ID
}

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

func (x *PrmContainerGet) buildRequest(c *Client) (*containergrpc.GetRequest, error) {
	if !x.idSet {
		return nil, errorMissingContainer
	}

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

	reqBody := new(containergrpc.GetRequest_Body)
	reqBody.SetContainerId(&cidV2)

	var req containergrpc.GetRequest
	req.SetBody(reqBody)
	c.prepareRequest(&req, new(sessiongrpc.RequestMetaHeader))
	return &req, nil
}

// ResContainerGet groups resulting values of ContainerGet operation.
type ResContainerGet struct {
	statusRes

	cnr *container.Container
}

func NewResContainerGet() *ResContainerGet {
	return &ResContainerGet{
		cnr: new(container.Container),
	}
}

// Container returns structured information about the requested container.
//
// Client doesn't retain value so modification is safe.
func (x *ResContainerGet) Container() *container.Container {
	return x.cnr
}

// ContainerGet reads FrostFS container by ID.
//
// 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 PrmContainerGet docs).
// Context is required and must not be nil. It is used for network communication.
//
// Return statuses:
//   - global (see Client docs);
//   - *apistatus.ContainerNotFound.
func (c *Client) ContainerGet(ctx context.Context, prm PrmContainerGet) (*ResContainerGet, error) {
	req, err := prm.buildRequest(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.GetContainer(&c.c, req, client.WithContext(ctx))
	if err != nil {
		return nil, err
	}

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

	cnrV2 := resp.GetBody().GetContainer()
	if cnrV2 == nil {
		return nil, errors.New("missing container in response")
	}
	if err := res.cnr.ReadFromV2(cnrV2); err != nil {
		return nil, fmt.Errorf("invalid container in response: %w", err)
	}
	return res, nil
}