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package common

import (
    "io/ioutil"
    "os"
    "os/user"
    "path"
    "path/filepath"
    "runtime"
    "strings"

    "github.com/kardianos/osext"
)

func ExpandHomePath(p string) (path string) {
    path = p

    // Check in case of paths like "/something/~/something/"
    if len(path) > 1 && path[:2] == "~/" {
        usr, _ := user.Current()
        dir := usr.HomeDir

        path = strings.Replace(p, "~", dir, 1)
    }

    return
}

func FileExist(filePath string) bool {
    _, err := os.Stat(filePath)
    if err != nil && os.IsNotExist(err) {
        return false
    }

    return true
}

func ReadAllFile(filePath string) (string, error) {
    file, err := os.Open(filePath)
    if err != nil {
        return "", err
    }

    data, err := ioutil.ReadAll(file)
    if err != nil {
        return "", err
    }

    return string(data), nil
}

func WriteFile(filePath string, content []byte) error {
    fh, err := os.OpenFile(filePath, os.O_TRUNC|os.O_RDWR|os.O_CREATE, os.ModePerm)
    if err != nil {
        return err
    }
    defer fh.Close()

    _, err = fh.Write(content)
    if err != nil {
        return err
    }

    return nil
}

func AbsolutePath(Datadir string, filename string) string {
    if path.IsAbs(filename) {
        return filename
    }
    return path.Join(Datadir, filename)
}

func DefaultAssetPath() string {
    var assetPath string
    pwd, _ := os.Getwd()
    srcdir := path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist")

    // If the current working directory is the go-ethereum dir
    // assume a debug build and use the source directory as
    // asset directory.
    if pwd == srcdir {
        assetPath = path.Join(pwd, "assets")
    } else {
        switch runtime.GOOS {
        case "darwin":
            // Get Binary Directory
            exedir, _ := osext.ExecutableFolder()
            assetPath = filepath.Join(exedir, "../Resources")
        case "linux":
            assetPath = "/usr/share/mist"
        case "windows":
            assetPath = "./assets"
        default:
            assetPath = "."
        }
    }

    // Check if the assetPath exists. If not, try the source directory
    // This happens when binary is run from outside cmd/mist directory
    if _, err := os.Stat(assetPath); os.IsNotExist(err) {
        assetPath = path.Join(srcdir, "assets")
    }

    return assetPath
}

func DefaultDataDir() string {
    usr, _ := user.Current()
    if runtime.GOOS == "darwin" {
        return path.Join(usr.HomeDir, "Library/Ethereum")
    } else if runtime.GOOS == "windows" {
        return path.Join(usr.HomeDir, "AppData/Roaming/Ethereum")
    } else {
        return path.Join(usr.HomeDir, ".ethereum")
    }
}

func IsWindows() bool {
    return runtime.GOOS == "windows"
}

func WindonizePath(path string) string {
    if string(path[0]) == "/" && IsWindows() {
        path = path[1:]
    }
    return path
}