// Copyright 2021 Evmos Foundation
// This file is part of Evmos' Ethermint library.
//
// The Ethermint library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Ethermint library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Ethermint library. If not, see https://github.com/evmos/ethermint/blob/main/LICENSE
package net

import (
	"context"
	"fmt"

	"github.com/cosmos/cosmos-sdk/client"
	ethermint "github.com/evmos/ethermint/types"
	rpcclient "github.com/tendermint/tendermint/rpc/client"
)

// PublicAPI is the eth_ prefixed set of APIs in the Web3 JSON-RPC spec.
type PublicAPI struct {
	networkVersion uint64
	tmClient       rpcclient.Client
}

// NewPublicAPI creates an instance of the public Net Web3 API.
func NewPublicAPI(clientCtx client.Context) *PublicAPI {
	// parse the chainID from a integer string
	chainIDEpoch, err := ethermint.ParseChainID(clientCtx.ChainID)
	if err != nil {
		panic(err)
	}

	return &PublicAPI{
		networkVersion: chainIDEpoch.Uint64(),
		tmClient:       clientCtx.Client,
	}
}

// Version returns the current ethereum protocol version.
func (s *PublicAPI) Version() string {
	return fmt.Sprintf("%d", s.networkVersion)
}

// Listening returns if client is actively listening for network connections.
func (s *PublicAPI) Listening() bool {
	ctx := context.Background()
	netInfo, err := s.tmClient.NetInfo(ctx)
	if err != nil {
		return false
	}
	return netInfo.Listening
}

// PeerCount returns the number of peers currently connected to the client.
func (s *PublicAPI) PeerCount() int {
	ctx := context.Background()
	netInfo, err := s.tmClient.NetInfo(ctx)
	if err != nil {
		return 0
	}
	return len(netInfo.Peers)
}