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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

// Package release contains the node service that tracks client releases.
package release

import (
    "fmt"
    "strings"
    "time"

    "github.com/ethereum/go-ethereum/accounts/abi/bind"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/logger/glog"
    "github.com/ethereum/go-ethereum/node"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/rpc"
)

// Interval to check for new releases
const releaseRecheckInterval = time.Hour

// Config contains the configurations of the release service.
type Config struct {
    Oracle common.Address // Ethereum address of the release oracle
    Major  uint32         // Major version component of the release
    Minor  uint32         // Minor version component of the release
    Patch  uint32         // Patch version component of the release
    Commit [20]byte       // Git SHA1 commit hash of the release
}

// ReleaseService is a node service that periodically checks the blockchain for
// newly released versions of the client being run and issues a warning to the
// user about it.
type ReleaseService struct {
    config Config          // Current version to check releases against
    oracle *ReleaseOracle  // Native binding to the release oracle contract
    quit   chan chan error // Quit channel to terminate the version checker
}

// NewReleaseService creates a new service to periodically check for new client
// releases and notify the user of such.
func NewReleaseService(ctx *node.ServiceContext, config Config) (node.Service, error) {
    // Retrieve the Ethereum service dependency to access the blockchain
    var ethereum *eth.Ethereum
    if err := ctx.Service(&ethereum); err != nil {
        return nil, err
    }
    // Construct the release service
    contract, err := NewReleaseOracle(config.Oracle, eth.NewContractBackend(ethereum))
    if err != nil {
        return nil, err
    }
    return &ReleaseService{
        config: config,
        oracle: contract,
        quit:   make(chan chan error),
    }, nil
}

// Protocols returns an empty list of P2P protocols as the release service does
// not have a networking component.
func (r *ReleaseService) Protocols() []p2p.Protocol { return nil }

// APIs returns an empty list of RPC descriptors as the release service does not
// expose any functioanlity to the outside world.
func (r *ReleaseService) APIs() []rpc.API { return nil }

// Start spawns the periodic version checker goroutine
func (r *ReleaseService) Start(server *p2p.Server) error {
    go r.checker()
    return nil
}

// Stop terminates all goroutines belonging to the service, blocking until they
// are all terminated.
func (r *ReleaseService) Stop() error {
    errc := make(chan error)
    r.quit <- errc
    return <-errc
}

// checker runs indefinitely in the background, periodically checking for new
// client releases.
func (r *ReleaseService) checker() {
    // Set up the timers to periodically check for releases
    timer := time.NewTimer(0) // Immediately fire a version check
    defer timer.Stop()

    for {
        select {
        // If the time arrived, check for a new release
        case <-timer.C:
            // Rechedule the timer before continuing
            timer.Reset(releaseRecheckInterval)

            // Retrieve the current version, and handle missing contracts gracefully
            version, err := r.oracle.CurrentVersion(nil)
            if err != nil {
                if err == bind.ErrNoCode {
                    glog.V(logger.Debug).Infof("Release oracle not found at %x", r.config.Oracle)
                    continue
                }
                glog.V(logger.Error).Infof("Failed to retrieve current release: %v", err)
                continue
            }
            // Version was successfully retrieved, notify if newer than ours
            if version.Major > r.config.Major ||
                (version.Major == r.config.Major && version.Minor > r.config.Minor) ||
                (version.Major == r.config.Major && version.Minor == r.config.Minor && version.Patch > r.config.Patch) {

                warning := fmt.Sprintf("Client v%d.%d.%d-%x seems older than the latest upstream release v%d.%d.%d-%x",
                    r.config.Major, r.config.Minor, r.config.Patch, r.config.Commit[:4], version.Major, version.Minor, version.Patch, version.Commit[:4])
                howtofix := fmt.Sprintf("Please check https://github.com/ethereum/go-ethereum/releases for new releases")
                separator := strings.Repeat("-", len(warning))

                glog.V(logger.Warn).Info(separator)
                glog.V(logger.Warn).Info(warning)
                glog.V(logger.Warn).Info(howtofix)
                glog.V(logger.Warn).Info(separator)
            } else {
                glog.V(logger.Debug).Infof("Client v%d.%d.%d-%x seems up to date with upstream v%d.%d.%d-%x",
                    r.config.Major, r.config.Minor, r.config.Patch, r.config.Commit[:4], version.Major, version.Minor, version.Patch, version.Commit[:4])
            }

        // If termination was requested, return
        case errc := <-r.quit:
            errc <- nil
            return
        }
    }
}