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

// PrmContainerDelete groups parameters of ContainerDelete operation.
type PrmContainerDelete struct {
	prmCommonMeta

	idSet bool
	id    cid.ID

	tokSet bool
	tok    session.Container
}

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

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

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

	// Container contract expects signature of container ID value,
	// don't get confused with stable marshaled protobuf container.ID structure.
	data := cidV2.GetValue()

	var sig frostfscrypto.Signature

	err := sig.Calculate(frostfsecdsa.SignerRFC6979(c.prm.key), data)
	if err != nil {
		return nil, fmt.Errorf("calculate signature: %w", err)
	}

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

	reqBody := new(v2container.DeleteRequestBody)
	reqBody.SetContainerID(&cidV2)
	reqBody.SetSignature(&sigv2)

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

	if x.tokSet {
		var tokv2 v2session.Token
		x.tok.WriteToV2(&tokv2)

		meta.SetSessionToken(&tokv2)
	}

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

// WithinSession specifies session within which container should be removed.
//
// Creator of the session acquires the authorship of the request.
// This may affect the execution of an operation (e.g. access control).
//
// Must be signed.
func (x *PrmContainerDelete) WithinSession(tok session.Container) {
	x.tok = tok
	x.tokSet = true
}

// ResContainerDelete groups resulting values of ContainerDelete operation.
type ResContainerDelete struct {
	statusRes
}

// ContainerDelete sends request to remove 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.
//
// 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 GetContainer).
//
// Returns an error if parameters are set incorrectly (see PrmContainerDelete docs).
// Context is required and must not be nil. It is used for network communication.
//
// Exactly one return value is non-nil. Server status return is returned in ResContainerDelete.
// Reflects all internal errors in second return value (transport problems, response processing, etc.).
//
// Return statuses:
//   - global (see Client docs).
func (c *Client) ContainerDelete(ctx context.Context, prm PrmContainerDelete) (*ResContainerDelete, error) {
	req, err := prm.formRequest(c)
	if err != nil {
		return nil, err
	}

	// init call context

	var (
		cc  contextCall
		res ResContainerDelete
	)

	c.initCallContext(&cc)
	cc.req = req
	cc.statusRes = &res
	cc.call = func() (responseV2, error) {
		return rpcapi.DeleteContainer(&c.c, req, client.WithContext(ctx))
	}

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

	return &res, nil
}