// Package models provides the models for the KermaGo application
package models

import (
	"errors"

	"github.com/docker/go/canonical/json"
	"golang.org/x/exp/slices"
)

/*
A Mempool represents a struct that has a type, and a list of tx ids
*/
type Mempool struct {
	Type  string   `json:"type" binding:"required"`
	Txids []string `json:"txids" binding:"required"`
}

/*
Construct creates a new Mempool object for this instance
*/
func (m *Mempool) Construct(mempool []string) {
	m.Type = "mempool"
	m.Txids = slices.Clone(mempool)
}

/*
MarshalJson returns the canonical json of the mempool object
*/
func (m *Mempool) MarshalJson() ([]byte, error) {
	return json.MarshalCanonical(m)
}

/*
UnmarshalJSON returns a new Mempool request from a byte array
*/
func (m *Mempool) UnmarshalJSON(data []byte) error {
	if len(data) == 0 {
		return nil
	}

	type tmp Mempool
	err := json.Unmarshal(data, (*tmp)(m))
	if err != nil {
		return err
	}

	if !m.verify() {
		return errors.New("mempool request not valid")
	}

	return nil
}

func (m *Mempool) verify() bool {
	return m.Type == "mempool"
}