# Copyright © 2022 Cerc

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http:#www.gnu.org/licenses/>.

# Builds or pulls containers for the system components

# env vars:
# CERC_REPO_BASE_DIR defaults to ~/cerc

# TODO: display the available list of containers; allow re-build of either all or specific containers

import os
import sys
from decouple import config
import subprocess
import click
import importlib.resources
from pathlib import Path
import yaml
from .util import include_exclude_check

# TODO: find a place for this
#    epilog="Config provided either in .env or settings.ini or env vars: CERC_REPO_BASE_DIR (defaults to ~/cerc)"


@click.command()
@click.option('--include', help="only build these containers")
@click.option('--exclude', help="don\'t build these containers")
@click.pass_context
def command(ctx, include, exclude):
    '''build the set of containers required for a complete stack'''

    quiet = ctx.obj.quiet
    verbose = ctx.obj.verbose
    dry_run = ctx.obj.dry_run
    local_stack = ctx.obj.local_stack
    stack = ctx.obj.stack
    continue_on_error = ctx.obj.continue_on_error

    # See: https://stackoverflow.com/questions/25389095/python-get-path-of-root-project-structure
    container_build_dir = Path(__file__).absolute().parent.joinpath("data", "container-build")

    if local_stack:
        dev_root_path = os.getcwd()[0:os.getcwd().rindex("stack-orchestrator")]
        print(f'Local stack dev_root_path (CERC_REPO_BASE_DIR) overridden to: {dev_root_path}')
    else:
        dev_root_path = os.path.expanduser(config("CERC_REPO_BASE_DIR", default="~/cerc"))

    if not quiet:
        print(f'Dev Root is: {dev_root_path}')

    if not os.path.isdir(dev_root_path):
        print('Dev root directory doesn\'t exist, creating')

    # See: https://stackoverflow.com/a/20885799/1701505
    from . import data
    with importlib.resources.open_text(data, "container-image-list.txt") as container_list_file:
        all_containers = container_list_file.read().splitlines()

    containers_in_scope = []
    if stack:
        # In order to be compatible with Python 3.8 we need to use this hack to get the path:
        # See: https://stackoverflow.com/questions/25389095/python-get-path-of-root-project-structure
        stack_file_path = Path(__file__).absolute().parent.joinpath("data", "stacks", stack, "stack.yml")
        with stack_file_path:
            stack_config = yaml.safe_load(open(stack_file_path, "r"))
            # TODO: syntax check the input here
            containers_in_scope = stack_config['containers']
    else:
        containers_in_scope = all_containers

    if verbose:
        print(f'Containers: {containers_in_scope}')
        if stack:
            print(f"Stack: {stack}")

    # TODO: make this configurable
    container_build_env = {
        "CERC_NPM_URL": "http://gitea.local:3000/api/packages/cerc-io/npm/",
        "CERC_NPM_AUTH_TOKEN": config("CERC_NPM_AUTH_TOKEN", default="<token-not-supplied>"),
        "CERC_REPO_BASE_DIR": dev_root_path
    }

    def process_container(container):
        if not quiet:
            print(f"Building: {container}")
        build_dir = os.path.join(container_build_dir, container.replace("/", "-"))
        build_script_filename = os.path.join(build_dir, "build.sh")
        if verbose:
            print(f"Build script filename: {build_script_filename}")
        if os.path.exists(build_script_filename):
            build_command = build_script_filename
        else:
            if verbose:
                print(f"No script file found: {build_script_filename}, using default build script")
            repo_dir = container.split('/')[1]
            # TODO: make this less of a hack -- should be specified in some metadata somewhere
            # Check if we have a repo for this container. If not, set the context dir to the container-build subdir
            repo_full_path = os.path.join(dev_root_path, repo_dir)
            repo_dir_or_build_dir = repo_dir if os.path.exists(repo_full_path) else build_dir
            build_command = os.path.join(container_build_dir, "default-build.sh") + f" {container} {repo_dir_or_build_dir}"
        if not dry_run:
            if verbose:
                print(f"Executing: {build_command}")
            build_result = subprocess.run(build_command, shell=True, env=container_build_env)
            if verbose:
                print(f"Return code is: {build_result.returncode}")
            if build_result.returncode != 0:
                print(f"Error running build for {container}")
                if not continue_on_error:
                    print("FATAL Error: container build failed and --continue-on-error not set, exiting")
                    sys.exit(1)
                else:
                    print("****** Container Build Error, continuing because --continue-on-error is set")
        else:
            print("Skipped")

    for container in containers_in_scope:
        if include_exclude_check(container, include, exclude):
            process_container(container)
        else:
            if verbose:
                print(f"Excluding: {container}")