package protocol

import (
	"encoding/json"
	"io"

	"hash-of-wisdom/internal/pow/challenge"
)


// ChallengeRequest is empty (no payload for challenge requests)
type ChallengeRequest struct{}

// Decode reads a challenge request from the payload stream
func (r *ChallengeRequest) Decode(stream io.Reader) error {
	// Challenge requests have no payload to decode
	return nil
}

// Encode writes a challenge request to the writer
func (r *ChallengeRequest) Encode(w io.Writer) error {
	return encode(w, ChallengeRequestType, nil)
}

// SolutionRequest contains the client's solution attempt
type SolutionRequest struct {
	Challenge challenge.Challenge `json:"challenge"`
	Nonce     uint64              `json:"nonce"`
}

// Decode reads a solution request from the payload stream
func (r *SolutionRequest) Decode(stream io.Reader) error {
	if stream == nil {
		// json.NewDecoder panics on nil reader
		return io.EOF
	}

	// Parse JSON directly from stream
	decoder := json.NewDecoder(stream)
	return decoder.Decode(r)
}

// Encode writes a solution request to the writer
func (r *SolutionRequest) Encode(w io.Writer) error {
	return encode(w, SolutionRequestType, r)
}