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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 build

import (
    "archive/tar"
    "archive/zip"
    "compress/gzip"
    "fmt"
    "io"
    "os"
    "path/filepath"
    "strings"
)

type Archive interface {
    // Directory adds a new directory entry to the archive and sets the
    // directory for subsequent calls to Header.
    Directory(name string) error

    // Header adds a new file to the archive. The file is added to the directory
    // set by Directory. The content of the file must be written to the returned
    // writer.
    Header(os.FileInfo) (io.Writer, error)

    // Close flushes the archive and closes the underlying file.
    Close() error
}

func NewArchive(file *os.File) (Archive, string) {
    switch {
    case strings.HasSuffix(file.Name(), ".zip"):
        return NewZipArchive(file), strings.TrimSuffix(file.Name(), ".zip")
    case strings.HasSuffix(file.Name(), ".tar.gz"):
        return NewTarballArchive(file), strings.TrimSuffix(file.Name(), ".tar.gz")
    default:
        return nil, ""
    }
}

// AddFile appends an existing file to an archive.
func AddFile(a Archive, file string) error {
    fd, err := os.Open(file)
    if err != nil {
        return err
    }
    defer fd.Close()
    fi, err := fd.Stat()
    if err != nil {
        return err
    }
    w, err := a.Header(fi)
    if err != nil {
        return err
    }
    if _, err := io.Copy(w, fd); err != nil {
        return err
    }
    return nil
}

// WriteArchive creates an archive containing the given files.
func WriteArchive(name string, files []string) (err error) {
    archfd, err := os.Create(name)
    if err != nil {
        return err
    }

    defer func() {
        archfd.Close()
        // Remove the half-written archive on failure.
        if err != nil {
            os.Remove(name)
        }
    }()
    archive, basename := NewArchive(archfd)
    if archive == nil {
        return fmt.Errorf("unknown archive extension")
    }
    fmt.Println(name)
    if err := archive.Directory(basename); err != nil {
        return err
    }
    for _, file := range files {
        fmt.Println("   +", filepath.Base(file))
        if err := AddFile(archive, file); err != nil {
            return err
        }
    }
    return archive.Close()
}

type ZipArchive struct {
    dir  string
    zipw *zip.Writer
    file io.Closer
}

func NewZipArchive(w io.WriteCloser) Archive {
    return &ZipArchive{"", zip.NewWriter(w), w}
}

func (a *ZipArchive) Directory(name string) error {
    a.dir = name + "/"
    return nil
}

func (a *ZipArchive) Header(fi os.FileInfo) (io.Writer, error) {
    head, err := zip.FileInfoHeader(fi)
    if err != nil {
        return nil, fmt.Errorf("can't make zip header: %v", err)
    }
    head.Name = a.dir + head.Name
    head.Method = zip.Deflate
    w, err := a.zipw.CreateHeader(head)
    if err != nil {
        return nil, fmt.Errorf("can't add zip header: %v", err)
    }
    return w, nil
}

func (a *ZipArchive) Close() error {
    if err := a.zipw.Close(); err != nil {
        return err
    }
    return a.file.Close()
}

type TarballArchive struct {
    dir  string
    tarw *tar.Writer
    gzw  *gzip.Writer
    file io.Closer
}

func NewTarballArchive(w io.WriteCloser) Archive {
    gzw := gzip.NewWriter(w)
    tarw := tar.NewWriter(gzw)
    return &TarballArchive{"", tarw, gzw, w}
}

func (a *TarballArchive) Directory(name string) error {
    a.dir = name + "/"
    return a.tarw.WriteHeader(&tar.Header{
        Name:     a.dir,
        Mode:     0755,
        Typeflag: tar.TypeDir,
    })
}

func (a *TarballArchive) Header(fi os.FileInfo) (io.Writer, error) {
    head, err := tar.FileInfoHeader(fi, "")
    if err != nil {
        return nil, fmt.Errorf("can't make tar header: %v", err)
    }
    head.Name = a.dir + head.Name
    if err := a.tarw.WriteHeader(head); err != nil {
        return nil, fmt.Errorf("can't add tar header: %v", err)
    }
    return a.tarw, nil
}

func (a *TarballArchive) Close() error {
    if err := a.tarw.Close(); err != nil {
        return err
    }
    if err := a.gzw.Close(); err != nil {
        return err
    }
    return a.file.Close()
}