package client

import (
	"context"
	"errors"
	"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"
	"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) formRequest(_ *Client) (*v2container.GetRequest, error) {
	if !x.idSet {
		return nil, errorMissingContainer
	}

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

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

	var req v2container.GetRequest
	req.SetBody(reqBody)
	return &req, nil
}

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

	cnr 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.formRequest(c)
	if err != nil {
		return nil, err
	}

	// init call context

	var (
		cc  contextCall
		res ResContainerGet
	)

	c.initCallContext(&cc)
	cc.meta = prm.prmCommonMeta
	cc.req = req
	cc.statusRes = &res
	cc.call = func() (responseV2, error) {
		return rpcapi.GetContainer(&c.c, req, client.WithContext(ctx))
	}
	cc.result = func(r responseV2) {
		resp := r.(*v2container.GetResponse)

		cnrV2 := resp.GetBody().GetContainer()
		if cnrV2 == nil {
			cc.err = errors.New("missing container in response")
			return
		}

		cc.err = res.cnr.ReadFromV2(*cnrV2)
		if cc.err != nil {
			cc.err = fmt.Errorf("invalid container in response: %w", cc.err)
		}
	}

	// process call
	if !cc.processCall() {
		return nil, cc.err
	}

	return &res, nil
}