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"""Helper script for automatic build of debian packages."""

import os

import sys

from git import GitCommandError

from optparse import OptionParser

from sh import mktemp, cd, rm, git_dch  # pylint: disable=E0611

from devflow import versioning

from devflow import utils

from devflow import BRANCH_TYPES

if sys.stdout.isatty():

    try:

        import colors

        use_colors = True

    except AttributeError:

        use_colors = False

else:

    use_colors = False

if use_colors:

    red = colors.red

    green = colors.green

else:

    red = lambda x: x

    green = lambda x: x

print_red = lambda x: sys.stdout.write(red(x) + "\n")

print_green = lambda x: sys.stdout.write(green(x) + "\n")

AVAILABLE_MODES = ["release", "snapshot"]

DESCRIPTION = """Tool for automatical build of debian packages.

%(prog)s is a helper script for automatic build of debian packages from

repositories that follow the `git flow` development model

<http://nvie.com/posts/a-successful-git-branching-model/>.

This script must run from inside a clean git repository and will perform the

following steps:

    * Clone your repository to a temporary directory

    * Merge the current branch with the corresponding debian branch

    * Compute the version of the new package and update the python

      version files

    * Create a new entry in debian/changelog, using `git-dch`

    * Create the debian packages, using `git-buildpackage`

    * Tag the appropriate branches if in `release` mode

%(prog)s will work with the packages that are declared in `autopkg.conf`

file, which must exist in the toplevel directory of the git repository.

"""

def print_help(prog):

    print DESCRIPTION % {"prog": prog}

def main():

    from devflow.version import __version__  # pylint: disable=E0611,F0401

    parser = OptionParser(usage="usage: %prog [options] mode",

                          version="devflow %s" % __version__,

                          add_help_option=False)

    parser.add_option("-h", "--help",

                      action="store_true",

                      default=False,

                      help="show this help message")

    parser.add_option("-k", "--keep-repo",

                      action="store_true",

                      dest="keep_repo",

                      default=False,

                      help="Do not delete the cloned repository")

    parser.add_option("-b", "--build-dir",

                      dest="build_dir",

                      default=None,

                      help="Directory to store created pacakges")

    parser.add_option("-r", "--repo-dir",

                      dest="repo_dir",

                      default=None,

                      help="Directory to clone repository")

    parser.add_option("-d", "--dirty",

                      dest="force_dirty",

                      default=False,

                      action="store_true",

                      help="Do not check if working directory is dirty")

    parser.add_option("-c", "--config-file",

                      dest="config_file",

                      help="Override default configuration file")

    parser.add_option("--no-sign",

                      dest="sign",

                      action="store_false",

                      default=True,

                      help="Do not sign the packages")

    parser.add_option("--key-id",

                      dest="keyid",

                      help="Use this keyid for gpg signing")

    parser.add_option("--dist",

                      dest="dist",

                      default="unstable",

                      help="If running in snapshot mode, automatically set"

                           " the changelog distribution to this value"

                           " (default=unstable).")

    parser.add_option("-S", "--source-only",

                      dest="source_only",

                      default=False,

                      action="store_true",

                      help="Specifies a source-only build, no binary packages"

                           " need to be made.")

    (options, args) = parser.parse_args()

    if options.help:

        print_help(parser.get_prog_name())

        parser.print_help()

        return

    # Get build mode

    try:

        mode = args[0]

    except IndexError:

        mode = utils.get_build_mode()

    if mode not in AVAILABLE_MODES:

        raise ValueError(red("Invalid argument! Mode must be one: %s"

                         % ", ".join(AVAILABLE_MODES)))

    # Load the repository

    original_repo = utils.get_repository()

    # Check that repository is clean

    toplevel = original_repo.working_dir

    if original_repo.is_dirty() and not options.force_dirty:

        raise RuntimeError(red("Repository %s is dirty." % toplevel))

    # Get packages from configuration file

    config = utils.get_config(options.config_file)

    packages = config['packages'].keys()

    print_green("Will build the following packages:\n" + "\n".join(packages))

    # Get current branch name and type and check if it is a valid one

    branch = original_repo.head.reference.name

    branch = utils.undebianize(branch)

    branch_type_str = utils.get_branch_type(branch)

    if branch_type_str not in BRANCH_TYPES.keys():

        allowed_branches = ", ".join(BRANCH_TYPES.keys())

        raise ValueError("Malformed branch name '%s', cannot classify as"

                         " one of %s" % (branch, allowed_branches))

    # Fix needed environment variables

    os.environ["DEVFLOW_BUILD_MODE"] = mode

    git_config = original_repo.config_reader()

    try:

        os.environ["DEBFULLNAME"] = git_config.get_value("user", "name")

        os.environ["DEBEMAIL"] = git_config.get_value("user", "email")

    except:

        print "Could not load user/email from config"

    # Check that base version file and branch are correct

    versioning.get_python_version()

    # Get the debian branch

    debian_branch = utils.get_debian_branch(branch)

    origin_debian = "origin/" + debian_branch

    # Clone the repo

    repo_dir = options.repo_dir or create_temp_directory("df-repo")

    repo_dir = os.path.abspath(repo_dir)

    repo = original_repo.clone(repo_dir, branch=branch)

    print_green("Cloned repository to '%s'." % repo_dir)

    build_dir = options.build_dir or create_temp_directory("df-build")

    build_dir = os.path.abspath(build_dir)

    print_green("Build directory: '%s'" % build_dir)

    # Create the debian branch

    repo.git.branch(debian_branch, origin_debian)

    print_green("Created branch '%s' to track '%s'" % (debian_branch,

                origin_debian))

    # Go to debian branch

    repo.git.checkout(debian_branch)

    print_green("Changed to branch '%s'" % debian_branch)

    # Merge with starting branch

    repo.git.merge(branch)

    print_green("Merged branch '%s' into '%s'" % (branch, debian_branch))

    # Compute python and debian version

    cd(repo_dir)

    python_version = versioning.get_python_version()

    debian_version = versioning.\

        debian_version_from_python_version(python_version)

    print_green("The new debian version will be: '%s'" % debian_version)

    # Update the version files

    versioning.update_version()

    # Tag branch with python version

    branch_tag = python_version

    try:

        repo.git.tag(branch_tag, branch)

    except GitCommandError:

        # Tag may already exist, if only the debian branch has changed

        pass

    upstream_tag = "upstream/" + branch_tag

    repo.git.tag(upstream_tag, branch)

    # Update changelog

    dch = git_dch("--debian-branch=%s" % debian_branch,

                  "--git-author",

                  "--ignore-regex=\".*\"",

                  "--multimaint-merge",

                  "--since=HEAD",

                  "--new-version=%s" % debian_version)

    print_green("Successfully ran '%s'" % " ".join(dch.cmd))

    if mode == "release":

        call("vim debian/changelog")

    else:

        f = open("debian/changelog", 'r+')

        lines = f.readlines()

        lines[0] = lines[0].replace("UNRELEASED", options.dist)

        lines[2] = lines[2].replace("UNRELEASED", "Snapshot build")

        f.seek(0)

        f.writelines(lines)

        f.close()

    # Add changelog to INDEX

    repo.git.add("debian/changelog")

    # Commit Changes

    repo.git.commit("-s", "-a", m="Bump version to %s" % debian_version)

    # Tag debian branch

    debian_branch_tag = "debian/" + utils.version_to_tag(debian_version)

    if mode == "release":

        repo.git.tag(debian_branch_tag)

    # Add version.py files to repo

    call("grep \"__version_vcs\" -r . -l -I | xargs git add -f")

    # Create debian packages

    cd(repo_dir)

    version_files = []

    for _, pkg_info in config['packages'].items():

        version_files.append(pkg_info['version_file'])

    ignore_regexp = "|".join(["^(%s)$" % vf for vf in version_files])

    build_cmd = "git-buildpackage --git-export-dir=%s"\

                " --git-upstream-branch=%s --git-debian-branch=%s"\

                " --git-export=INDEX --git-ignore-new -sa"\

                " --source-option='\"--extend-diff-ignore=%s\"'"\

                " --git-upstream-tag=%s"\

                % (build_dir, branch, debian_branch, ignore_regexp,

                   upstream_tag)

    if options.source_only:

        build_cmd += " -S"

    if not options.sign:

        build_cmd += " -uc -us"

    elif options.keyid:

        build_cmd += " -k\"'%s'\"" % options.keyid

    call(build_cmd)

    # Remove cloned repo

    if mode != 'release' and not options.keep_repo:

        print_green("Removing cloned repo '%s'." % repo_dir)

        rm("-r", repo_dir)

    # Print final info

    info = (("Version", debian_version),

            ("Upstream branch", branch),

            ("Upstream tag", branch_tag),

            ("Debian branch", debian_branch),

            ("Debian tag", debian_branch_tag),

            ("Repository directory", repo_dir),

            ("Packages directory", build_dir))

    print_green("\n".join(["%s: %s" % (name, val) for name, val in info]))

    # Print help message

    if mode == "release":

        origin = original_repo.remote().url

        repo.create_remote("original_origin", origin)

        print_green("Created remote 'original_origin' for the repository '%s'"

                    % origin)

        print_green("To update repositories '%s' and '%s' go to '%s' and run:"

                    % (toplevel, origin, repo_dir))

        for remote in ['origin', 'original_origin']:

            objects = [debian_branch, branch_tag, debian_branch_tag]

            print_green("git push %s %s" % (remote, " ".join(objects)))

def create_temp_directory(suffix):

    create_dir_cmd = mktemp("-d", "/tmp/" + suffix + "-XXXXX")

    return create_dir_cmd.stdout.strip()

def call(cmd):

    rc = os.system(cmd)

    if rc:

        raise RuntimeError("Command '%s' failed!" % cmd)

if __name__ == "__main__":

    sys.exit(main())