package frostfsid

import (
	"fmt"

	frostfsidclient "git.frostfs.info/TrueCloudLab/frostfs-contract/frostfsid/client"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/client"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)

const (
	methodGetSubject         = "getSubject"
	methodGetSubjectExtended = "getSubjectExtended"
)

func (c *Client) GetSubject(addr util.Uint160) (*frostfsidclient.Subject, error) {
	prm := client.TestInvokePrm{}
	prm.SetMethod(methodGetSubject)
	prm.SetArgs(addr)

	res, err := c.client.TestInvoke(prm)
	if err != nil {
		return nil, fmt.Errorf("could not perform test invocation (%s): %w", methodGetSubject, err)
	}

	structArr, err := checkStackItem(res)
	if err != nil {
		return nil, fmt.Errorf("invalid test invocation result (%s): %w", methodGetSubjectExtended, err)
	}

	subj, err := frostfsidclient.ParseSubject(structArr)
	if err != nil {
		return nil, fmt.Errorf("could not parse test invocation result (%s): %w", methodGetSubject, err)
	}

	return subj, nil
}

func (c *Client) GetSubjectExtended(addr util.Uint160) (*frostfsidclient.SubjectExtended, error) {
	prm := client.TestInvokePrm{}
	prm.SetMethod(methodGetSubjectExtended)
	prm.SetArgs(addr)

	res, err := c.client.TestInvoke(prm)
	if err != nil {
		return nil, fmt.Errorf("could not perform test invocation (%s): %w", methodGetSubjectExtended, err)
	}

	structArr, err := checkStackItem(res)
	if err != nil {
		return nil, fmt.Errorf("invalid test invocation result (%s): %w", methodGetSubjectExtended, err)
	}

	subj, err := frostfsidclient.ParseSubjectExtended(structArr)
	if err != nil {
		return nil, fmt.Errorf("could not parse test invocation result (%s): %w", methodGetSubject, err)
	}

	return subj, nil
}

func checkStackItem(res []stackitem.Item) (structArr []stackitem.Item, err error) {
	if ln := len(res); ln != 1 {
		return nil, fmt.Errorf("unexpected stack item count (%s): %d", methodGetSubject, ln)
	}

	structArr, err = client.ArrayFromStackItem(res[0])
	if err != nil {
		return nil, fmt.Errorf("could not get item array of container (%s): %w", methodGetSubject, err)
	}
	return
}