#!/usr/bin/env python3

import argparse
import json
import os
import subprocess
import xml.etree.ElementTree as ET
import sys

from scripts.common import git
from scripts.common import Colors
from scripts.common import get_meson
from scripts.common import accept_command


SCRIPTDIR = os.path.normpath(os.path.dirname(__file__))


def checkout_subprojects(worktree_dir, branch):
    subprojects_dir = os.path.join(SCRIPTDIR, "subprojects")
    worktree_subdir = os.path.join(worktree_dir, "subprojects")

    meson = get_meson()
    installed_s = subprocess.check_output(meson + ['introspect', options.builddir, '--projectinfo'])
    for subproj in json.loads(installed_s.decode())["subprojects"]:
        repo_name = subproj["name"]
        if not repo_name.startswith("gst"):
            continue

        repo_dir = os.path.normpath(os.path.join(SCRIPTDIR, subprojects_dir, repo_name))
        if not os.path.exists(os.path.join(repo_dir, '.git')):
            continue

        workdir = os.path.normpath(os.path.join(worktree_subdir, repo_name))
        if not checkout_worktree(repo_name, repo_dir, workdir, branch):
            return False

    return True


def checkout_worktree(repo_name, repo_dir, worktree_dir, branch):
    print("Checking out worktree %s in %s (branch %s)" % (repo_name, worktree_dir, branch))
    try:
        git("worktree", "add", worktree_dir, branch, repository_path=repo_dir)
    except Exception as e:
        out = getattr(e, "output", b"").decode()
        print("\nCould not checkout worktree %s, please fix and try again."
              " Error:\n\n%s %s" % (repo_dir, out, e))

        return False

    commit_message = git("show", "--shortstat", repository_path=repo_dir).split("\n")
    print(u"  -> %s%s%s - %s" % (Colors.HEADER, repo_dir, Colors.ENDC,
                                    commit_message[4].strip()))

    return True


if __name__ == "__main__":
    parser = argparse.ArgumentParser(prog="git-update")


    parser.add_argument('worktree_dir', metavar='worktree_dir', type=str,
                        help='The directory where to checkout the new worktree')
    parser.add_argument('branch', metavar='branch', type=str,
                        help='The branch to checkout')
    parser.add_argument("--no-color",
                        default=False,
                        action='store_true',
                        help="Do not output ansi colors.")
    parser.add_argument("--builddir", '-C',
                        default=os.path.join(SCRIPTDIR, "build"),
                        help="The meson build directory")
    options = parser.parse_args()

    if options.no_color or not Colors.can_enable():
        Colors.disable()

    if not os.path.exists(options.builddir):
        print("GStreamer not built in %s\n\nBuild it and try again" %
              options.builddir)
        exit(1)

    options.worktree_dir = os.path.abspath(options.worktree_dir)
    if not checkout_worktree('gst-build', SCRIPTDIR, options.worktree_dir, options.branch):
        exit(1)
    if not checkout_subprojects(options.worktree_dir, options.branch):
        exit(1)