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// Copyright 2016 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package main

import (
    "fmt"
    "io/ioutil"
    "os"
    "path/filepath"
    "runtime"
    "strconv"
    "strings"

    "github.com/ethereum/go-ethereum/cmd/utils"
    "github.com/ethereum/go-ethereum/consensus/ethash"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/params"
    "gopkg.in/urfave/cli.v1"
)

var (
    makedagCommand = cli.Command{
        Action:    makedag,
        Name:      "makedag",
        Usage:     "Generate ethash DAG (for testing)",
        ArgsUsage: "<blockNum> <outputDir>",
        Category:  "MISCELLANEOUS COMMANDS",
        Description: `
The makedag command generates an ethash DAG in /tmp/dag.

This command exists to support the system testing project.
Regular users do not need to execute it.
`,
    }
    versionCommand = cli.Command{
        Action:    version,
        Name:      "version",
        Usage:     "Print version numbers",
        ArgsUsage: " ",
        Category:  "MISCELLANEOUS COMMANDS",
        Description: `
The output of this command is supposed to be machine-readable.
`,
    }
    licenseCommand = cli.Command{
        Action:    license,
        Name:      "license",
        Usage:     "Display license information",
        ArgsUsage: " ",
        Category:  "MISCELLANEOUS COMMANDS",
    }
)

func makedag(ctx *cli.Context) error {
    args := ctx.Args()
    wrongArgs := func() {
        utils.Fatalf(`Usage: geth makedag <block number> <outputdir>`)
    }
    switch {
    case len(args) == 2:
        blockNum, err := strconv.ParseUint(args[0], 0, 64)
        dir := args[1]
        if err != nil {
            wrongArgs()
        } else {
            dir = filepath.Clean(dir)
            // seems to require a trailing slash
            if !strings.HasSuffix(dir, "/") {
                dir = dir + "/"
            }
            _, err = ioutil.ReadDir(dir)
            if err != nil {
                utils.Fatalf("Can't find dir")
            }
            fmt.Println("making DAG, this could take awhile...")
            ethash.MakeDataset(blockNum, dir)
        }
    default:
        wrongArgs()
    }
    return nil
}

func version(ctx *cli.Context) error {
    fmt.Println(strings.Title(clientIdentifier))
    fmt.Println("Version:", params.Version)
    if gitCommit != "" {
        fmt.Println("Git Commit:", gitCommit)
    }
    fmt.Println("Protocol Versions:", eth.ProtocolVersions)
    fmt.Println("Network Id:", ctx.GlobalInt(utils.NetworkIdFlag.Name))
    fmt.Println("Go Version:", runtime.Version())
    fmt.Println("OS:", runtime.GOOS)
    fmt.Printf("GOPATH=%s\n", os.Getenv("GOPATH"))
    fmt.Printf("GOROOT=%s\n", runtime.GOROOT())
    return nil
}

func license(_ *cli.Context) error {
    fmt.Println(`Geth is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Geth 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with geth. If not, see <http://www.gnu.org/licenses/>.
`)
    return nil
}