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-sdk-go/container"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	frostfscrypto "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/crypto"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
)

// PrmContainerPut groups parameters of ContainerPut operation.
type PrmContainerPut struct {
	prmCommonMeta

	cnrSet bool
	cnr    container.Container

	sessionSet bool
	session    session.Container
}

// SetContainer sets structured information about new FrostFS container.
// Required parameter.
func (x *PrmContainerPut) SetContainer(cnr container.Container) {
	x.cnr = cnr
	x.cnrSet = true
}

// WithinSession specifies session within which container should be saved.
//
// Creator of the session acquires the authorship of the request. This affects
// the execution of an operation (e.g. access control).
//
// Session is optional, if set the following requirements apply:
//   - session operation MUST be session.VerbContainerPut (ForVerb)
//   - token MUST be signed using private key of the owner of the container to be saved
func (x *PrmContainerPut) WithinSession(s session.Container) {
	x.session = s
	x.sessionSet = true
}

func (x *PrmContainerPut) formRequest(c *Client) (*v2container.PutRequest, error) {
	if !x.cnrSet {
		return nil, errorMissingContainer
	}

	// TODO: check private key is set before forming the request
	var cnr v2container.Container
	x.cnr.WriteToV2(&cnr)

	var sig frostfscrypto.Signature

	err := container.CalculateSignature(&sig, x.cnr, c.prm.key)
	if err != nil {
		return nil, fmt.Errorf("calculate container signature: %w", err)
	}

	var sigv2 refs.Signature
	sig.WriteToV2(&sigv2)

	reqBody := new(v2container.PutRequestBody)
	reqBody.SetContainer(&cnr)
	reqBody.SetSignature(&sigv2)

	var meta v2session.RequestMetaHeader
	writeXHeadersToMeta(x.prmCommonMeta.xHeaders, &meta)

	if x.sessionSet {
		var tokv2 v2session.Token
		x.session.WriteToV2(&tokv2)

		meta.SetSessionToken(&tokv2)
	}

	var req v2container.PutRequest
	req.SetBody(reqBody)
	req.SetMetaHeader(&meta)
	return &req, nil
}

// ResContainerPut groups resulting values of ContainerPut operation.
type ResContainerPut struct {
	statusRes

	id cid.ID
}

// ID returns identifier of the container declared to be stored in the system.
// Used as a link to information about the container (in particular, you can
// asynchronously check if the save was successful).
func (x ResContainerPut) ID() cid.ID {
	return x.id
}

// ContainerPut sends request to save container in FrostFS.
//
// 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.
//
// Success can be verified by reading by identifier (see ResContainerPut.ID).
//
// Returns an error if parameters are set incorrectly (see PrmContainerPut docs).
// Context is required and must not be nil. It is used for network communication.
//
// Return statuses:
//   - global (see Client docs).
//
// nolint: funlen
func (c *Client) ContainerPut(ctx context.Context, prm PrmContainerPut) (*ResContainerPut, error) {
	req, err := prm.formRequest(c)
	if err != nil {
		return nil, err
	}

	// init call context

	var (
		cc  contextCall
		res ResContainerPut
	)

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

		const fieldCnrID = "container ID"

		cidV2 := resp.GetBody().GetContainerID()
		if cidV2 == nil {
			cc.err = newErrMissingResponseField(fieldCnrID)
			return
		}

		cc.err = res.id.ReadFromV2(*cidV2)
		if cc.err != nil {
			cc.err = newErrInvalidResponseField(fieldCnrID, cc.err)
		}
	}

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

	return &res, nil
}