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// Copyright 2017 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 (
    "bytes"
    "fmt"
    "io"
    "io/ioutil"
    "net/url"
    "os/exec"
    "runtime"
    "strings"

    "github.com/dexon-foundation/dexon/cmd/internal/browser"
    "github.com/dexon-foundation/dexon/params"

    "github.com/dexon-foundation/dexon/cmd/utils"
    cli "gopkg.in/urfave/cli.v1"
)

var bugCommand = cli.Command{
    Action:    utils.MigrateFlags(reportBug),
    Name:      "bug",
    Usage:     "opens a window to report a bug on the gdex repo",
    ArgsUsage: " ",
    Category:  "MISCELLANEOUS COMMANDS",
}

const issueURL = "https://github.com/dexon-foundation/dexon/issues/new"

// reportBug reports a bug by opening a new URL to the go-ethereum GH issue
// tracker and setting default values as the issue body.
func reportBug(ctx *cli.Context) error {
    // execute template and write contents to buff
    var buff bytes.Buffer

    fmt.Fprintln(&buff, "#### System information")
    fmt.Fprintln(&buff)
    fmt.Fprintln(&buff, "Version:", params.VersionWithMeta)
    fmt.Fprintln(&buff, "Go Version:", runtime.Version())
    fmt.Fprintln(&buff, "OS:", runtime.GOOS)
    printOSDetails(&buff)
    fmt.Fprintln(&buff, header)

    // open a new GH issue
    if !browser.Open(issueURL + "?body=" + url.QueryEscape(buff.String())) {
        fmt.Printf("Please file a new issue at %s using this template:\n\n%s", issueURL, buff.String())
    }
    return nil
}

// copied from the Go source. Copyright 2017 The Go Authors
func printOSDetails(w io.Writer) {
    switch runtime.GOOS {
    case "darwin":
        printCmdOut(w, "uname -v: ", "uname", "-v")
        printCmdOut(w, "", "sw_vers")
    case "linux":
        printCmdOut(w, "uname -sr: ", "uname", "-sr")
        printCmdOut(w, "", "lsb_release", "-a")
    case "openbsd", "netbsd", "freebsd", "dragonfly":
        printCmdOut(w, "uname -v: ", "uname", "-v")
    case "solaris":
        out, err := ioutil.ReadFile("/etc/release")
        if err == nil {
            fmt.Fprintf(w, "/etc/release: %s\n", out)
        } else {
            fmt.Printf("failed to read /etc/release: %v\n", err)
        }
    }
}

// printCmdOut prints the output of running the given command.
// It ignores failures; 'go bug' is best effort.
//
// copied from the Go source. Copyright 2017 The Go Authors
func printCmdOut(w io.Writer, prefix, path string, args ...string) {
    cmd := exec.Command(path, args...)
    out, err := cmd.Output()
    if err != nil {
        fmt.Printf("%s %s: %v\n", path, strings.Join(args, " "), err)
        return
    }
    fmt.Fprintf(w, "%s%s\n", prefix, bytes.TrimSpace(out))
}

const header = `
#### Expected behaviour


#### Actual behaviour


#### Steps to reproduce the behaviour


#### Backtrace
`