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"""This is the main tool for handling llvm builds, bisects etc."""

import os
from sys import exit

from modules.llvm import LLVMSubproject
from modules.llvm import LLVMSourceConfig
from modules.llvm import get_remote_branch
from modules.llvm import push_branch

from linaropy.git.clone import Clone
from linaropy.proj import Proj

from argparse import Action, ArgumentParser, RawTextHelpFormatter
from functools import partial


def die(message, config_to_dump=None):
    """Print an error message and exit."""
    print(message)

    if config_to_dump is not None:
        dump_config(config_to_dump)

    exit(1)


def get_worktree_root(env):
    """Get the path to the LLVM worktree corresponding to env."""
    return os.path.join(env, "llvm")


def dump_config(config):
    """Dump the list of projects that are enabled in the given config."""

    print("Projects linked:")
    enabled = config.get_enabled_subprojects()
    if not enabled:
        print("none")
    else:
        for subproj in sorted(enabled):
            print("  + {}".format(subproj))


def projects(args):
    """Add/remove subprojects based on the values in args."""

    proj = Proj()

    llvm_worktree_root = get_worktree_root(args.env)
    llvm_repos_root = args.repos
    config = LLVMSourceConfig(proj, llvm_worktree_root)

    if not args.add and not args.remove:
        # Nothing to change, just print the current configuration
        dump_config(config)
        exit(0)

    to_add = {}
    if args.add:
        for subproj in args.add:
            repo = Clone(proj, os.path.join(llvm_repos_root, subproj))
            to_add[subproj] = repo

    try:
        config.update(to_add, args.remove)
    except (EnvironmentError, ValueError) as exc:
        die("Failed to update subprojects because:\n{}".format(str(exc)))

    dump_config(config)


def push_current_branch(args):
    """Push current branch to origin."""

    proj = Proj()

    llvm_worktree_root = get_worktree_root(args.env)
    config = LLVMSourceConfig(proj, llvm_worktree_root)

    llvm_worktree = Clone(proj, llvm_worktree_root)
    local_branch = llvm_worktree.getbranch()

    try:
        remote_branch = get_remote_branch(llvm_worktree, local_branch)
        config.for_each_enabled(partial(push_branch, proj, local_branch,
                                        remote_branch))
        print("Pushed to {}".format(remote_branch))
    except (EnvironmentError, RuntimeError) as exc:
        die("Failed to push branch because: " + str(exc) + str(exc.__cause__))


##########################################################################
# Command line parsing                                                   #
##########################################################################

# If we decide we want shorthands for the subprojects, we can append to this
# list
valid_subprojects = list(LLVMSubproject.get_all_subprojects().keys())

options = ArgumentParser(formatter_class=RawTextHelpFormatter)
options.add_argument(
    '--env',
    required=True,
    help="Path to the environment to update.")
options.add_argument(
    '--repos', required=True,
    help="Path to the directory containing the repositories for all LLVM subprojects.")

subcommands = options.add_subparsers()

# Subcommand for adding / removing subprojects
projs = subcommands.add_parser("projects", help="Add/remove LLVM subprojects.")
projs.set_defaults(run_command=projects)

# TODO: Overwriting previous values is not necessarily what users expect (so for
# instance --add S1 S2 --remove S3 --add S4 would lead to adding only S4). We
# can do better by using action='append', which would create a list (of lists?
# or of lists and scalars?) that we can flatten to obtain all the values passed
# by the user.
projs.add_argument(
    '-a', '--add',
    nargs='+',
    choices=valid_subprojects,
    metavar='subproject',
    help="Link given subprojects. Valid values are:\n\t{}\n".format(
         "\n\t".join(valid_subprojects)))
projs.add_argument(
    '-r', '--remove',
    nargs='+',
    choices=valid_subprojects,
    metavar='subproject',
    help="Unlink given subprojects.")

# Subcommand for pushing the current branch to origin
push = subcommands.add_parser(
    "push",
    help="Push current branch to origin linaro-local/<user>/<branch>, for all linked subprojects.")
push.set_defaults(run_command=push_current_branch)

args = options.parse_args()
args.run_command(args)