#!/usr/bin/python
#
# Copyright 2016 Red Hat | Ansible
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations


DOCUMENTATION = r"""
module: docker_image_load

short_description: Load docker image(s) from archives

version_added: 1.3.0

description:
  - Load one or multiple Docker images from a C(.tar) archive, and return information on the loaded image(s).
extends_documentation_fragment:
  - community.docker._docker.api_documentation
  - community.docker._attributes
  - community.docker._attributes.actiongroup_docker

attributes:
  check_mode:
    support: none
  diff_mode:
    support: none
  idempotent:
    support: none

options:
  path:
    description:
      - The path to the C(.tar) archive to load Docker image(s) from.
    type: path
    required: true

requirements:
  - "Docker API >= 1.25"

author:
  - Felix Fontein (@felixfontein)

seealso:
  - module: community.docker.docker_image_export
  - module: community.docker.docker_image_push
  - module: community.docker.docker_image_remove
  - module: community.docker.docker_image_tag
"""

EXAMPLES = r"""
---
- name: Load all image(s) from the given tar file
  community.docker.docker_image_load:
    path: /path/to/images.tar
  register: result

- name: Print the loaded image names
  ansible.builtin.debug:
    msg: "Loaded the following images: {{ result.image_names | join(', ') }}"
"""

RETURN = r"""
image_names:
  description: List of image names and IDs loaded from the archive.
  returned: success
  type: list
  elements: str
  sample:
    - 'hello-world:latest'
    - 'sha256:e004c2cc521c95383aebb1fb5893719aa7a8eae2e7a71f316a4410784edb00a9'
images:
  description: Image inspection results for the loaded images.
  returned: success
  type: list
  elements: dict
  sample: []
"""

import errno
import traceback

from ansible_collections.community.docker.plugins.module_utils._api.errors import (
    DockerException,
)
from ansible_collections.community.docker.plugins.module_utils._common_api import (
    AnsibleDockerClient,
    RequestException,
)
from ansible_collections.community.docker.plugins.module_utils._util import (
    DockerBaseClass,
    is_image_name_id,
)


class ImageManager(DockerBaseClass):
    def __init__(self, client, results):
        super().__init__()

        self.client = client
        self.results = results
        parameters = self.client.module.params
        self.check_mode = self.client.check_mode

        self.path = parameters["path"]

        self.load_images()

    @staticmethod
    def _extract_output_line(line, output):
        """
        Extract text line from stream output and, if found, adds it to output.
        """
        if "stream" in line or "status" in line:
            # Make sure we have a string (assuming that line['stream'] and
            # line['status'] are either not defined, falsish, or a string)
            text_line = line.get("stream") or line.get("status") or ""
            output.extend(text_line.splitlines())

    def load_images(self):
        """
        Load images from a .tar archive
        """
        # Load image(s) from file
        load_output = []
        try:
            self.log(f"Opening image {self.path}")
            with open(self.path, "rb") as image_tar:
                self.log(f"Loading images from {self.path}")
                res = self.client._post(
                    self.client._url("/images/load"), data=image_tar, stream=True
                )
                for line in self.client._stream_helper(res, decode=True):
                    self.log(line, pretty_print=True)
                    self._extract_output_line(line, load_output)
        except EnvironmentError as exc:
            if exc.errno == errno.ENOENT:
                self.client.fail(f"Error opening archive {self.path} - {exc}")
            self.client.fail(
                f"Error loading archive {self.path} - {exc}",
                stdout="\n".join(load_output),
            )
        except Exception as exc:  # pylint: disable=broad-exception-caught
            self.client.fail(
                f"Error loading archive {self.path} - {exc}",
                stdout="\n".join(load_output),
            )

        # Collect loaded images
        loaded_images = []
        for line in load_output:
            if line.startswith("Loaded image:"):
                loaded_images.append(line[len("Loaded image:") :].strip())
            if line.startswith("Loaded image ID:"):
                loaded_images.append(line[len("Loaded image ID:") :].strip())

        if not loaded_images:
            self.client.fail(
                "Detected no loaded images. Archive potentially corrupt?",
                stdout="\n".join(load_output),
            )

        images = []
        for image_name in loaded_images:
            if is_image_name_id(image_name):
                images.append(self.client.find_image_by_id(image_name))
            elif ":" in image_name:
                image_name, tag = image_name.rsplit(":", 1)
                images.append(self.client.find_image(image_name, tag))
            else:
                self.client.module.warn(
                    f'Image name "{image_name}" is neither ID nor has a tag'
                )

        self.results["image_names"] = loaded_images
        self.results["images"] = images
        self.results["changed"] = True
        self.results["stdout"] = "\n".join(load_output)


def main():
    client = AnsibleDockerClient(
        argument_spec={
            "path": {"type": "path", "required": True},
        },
        supports_check_mode=False,
    )

    try:
        results = {
            "image_names": [],
            "images": [],
        }

        ImageManager(client, results)
        client.module.exit_json(**results)
    except DockerException as e:
        client.fail(
            f"An unexpected Docker error occurred: {e}",
            exception=traceback.format_exc(),
        )
    except RequestException as e:
        client.fail(
            f"An unexpected requests error occurred when trying to talk to the Docker daemon: {e}",
            exception=traceback.format_exc(),
        )


if __name__ == "__main__":
    main()