package sdk

import (
	"errors"

	rpcv1 "code.icb4dc0.de/buildr/wasi-module-sdk-go/protocol/generated/rpc/v1"

	"code.icb4dc0.de/buildr/wasi-module-sdk-go/mem"
)

type StateProxy struct{}

func (s StateProxy) Set(key, state []byte) error {
	setCmd := &rpcv1.SetState{
		Key:  key,
		Data: state,
	}
	data, err := setCmd.MarshalVT()
	if err != nil {
		return err
	}

	result := _set_state(mem.DataToManagedPtr(data))
	if result == 0 {
		return errors.New("unknown error occurred")
	}
	resultPtr := uint32(result >> 32)
	resultSize := uint32(result)

	if resultSize == 0 {
		return nil
	}

	resultMsg := new(rpcv1.Result)
	if err := resultMsg.UnmarshalVT(mem.PtrToData(resultPtr, resultSize)); err != nil {
		return err
	}

	if !resultMsg.Success {
		if resultMsg.Error != "" {
			return errors.New(resultMsg.Error)
		}
		return errors.New("unknown error occurred")
	}

	return nil
}

func (s StateProxy) Get(key []byte) (state []byte, meta StateMetadata, err error) {
	getCmd := &rpcv1.GetStateRequest{
		Key: key,
	}

	data, err := getCmd.MarshalVT()
	if err != nil {
		return nil, StateMetadata{}, err
	}

	result := _get_state(mem.DataToManagedPtr(data))
	if result == 0 {
		return nil, StateMetadata{}, errors.New("error occurred while processing request")
	}
	resultPtr := uint32(result >> 32)
	resultSize := uint32(result)

	if resultSize == 0 {
		return nil, StateMetadata{}, nil
	}

	getStateResult := new(rpcv1.GetStateResponse)
	if err := getStateResult.UnmarshalVT(mem.PtrToData(resultPtr, resultSize)); err != nil {
		return nil, StateMetadata{}, err
	}

	return getStateResult.Data, StateMetadata{}, nil
}