#!/usr/bin/python

# Copyright: (c) 2019, Hetzner Cloud GmbH <info@hetzner-cloud.de>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)


DOCUMENTATION = """
---
module: hcloud_volume

short_description: Create and manage block Volume on the Hetzner Cloud.


description:
    - Create, update and attach/detach block Volume on the Hetzner Cloud.

author:
    - Christopher Schmitt (@cschmitt-hcloud)

options:
    id:
        description:
            - The ID of the Hetzner Cloud Block Volume to manage.
            - Only required if no volume I(name) is given
        type: int
    name:
        description:
            - The Name of the Hetzner Cloud Block Volume to manage.
            - Only required if no volume I(id) is given or a volume does not exist.
        type: str
    size:
        description:
            - The size of the Block Volume in GB.
            - Required if volume does not yet exists.
        type: int
    automount:
        description:
            - Automatically mount the Volume.
        type: bool
        default: False
    format:
        description:
            - Automatically Format the volume on creation
            - Can only be used in case the Volume does not exist.
        type: str
        choices: [xfs, ext4]
    location:
        description:
            - Location of the Hetzner Cloud Volume.
            - Required if no I(server) is given and Volume does not exist.
        type: str
    server:
        description:
            - Server Name the Volume should be assigned to.
            - Required if no I(location) is given and Volume does not exist.
        type: str
    delete_protection:
        description:
            - Protect the Volume for deletion.
        type: bool
    labels:
        description:
            - User-defined key-value pairs.
        type: dict
    state:
        description:
            - State of the Volume.
        default: present
        choices: [absent, present]
        type: str
extends_documentation_fragment:
- hetzner.hcloud.hcloud

"""

EXAMPLES = """
- name: Create a Volume
  hetzner.hcloud.hcloud_volume:
    name: my-volume
    location: fsn1
    size: 100
    state: present
- name: Create a Volume and format it with ext4
  hetzner.hcloud.hcloud_volume:
    name: my-volume
    location: fsn
    format: ext4
    size: 100
    state: present
- name: Mount a existing Volume and automount
  hetzner.hcloud.hcloud_volume:
    name: my-volume
    server: my-server
    automount: true
    state: present
- name: Mount a existing Volume and automount
  hetzner.hcloud.hcloud_volume:
    name: my-volume
    server: my-server
    automount: true
    state: present
- name: Ensure the Volume is absent (remove if needed)
  hetzner.hcloud.hcloud_volume:
    name: my-volume
    state: absent
"""

RETURN = """
hcloud_volume:
    description: The block Volume
    returned: Always
    type: complex
    contains:
        id:
            description: ID of the Volume
            type: int
            returned: Always
            sample: 12345
        name:
            description: Name of the Volume
            type: str
            returned: Always
            sample: my-volume
        size:
            description: Size in GB of the Volume
            type: int
            returned: Always
            sample: 1337
        linux_device:
            description: Path to the device that contains the Volume.
            returned: always
            type: str
            sample: /dev/disk/by-id/scsi-0HC_Volume_12345
            version_added: "0.1.0"
        location:
            description: Location name where the Volume is located at
            type: str
            returned: Always
            sample: "fsn1"
        labels:
            description: User-defined labels (key-value pairs)
            type: dict
            returned: Always
            sample:
                key: value
                mylabel: 123
        server:
            description: Server name where the Volume is attached to
            type: str
            returned: Always
            sample: "my-server"
        delete_protection:
            description: True if Volume is protected for deletion
            type: bool
            returned: always
            sample: false
            version_added: "0.1.0"
"""

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.common.text.converters import to_native

from ..module_utils.hcloud import AnsibleHCloud
from ..module_utils.vendor.hcloud import HCloudException


class AnsibleHCloudVolume(AnsibleHCloud):
    def __init__(self, module):
        super().__init__(module, "hcloud_volume")
        self.hcloud_volume = None

    def _prepare_result(self):
        server_name = None
        if self.hcloud_volume.server is not None:
            server_name = to_native(self.hcloud_volume.server.name)

        return {
            "id": to_native(self.hcloud_volume.id),
            "name": to_native(self.hcloud_volume.name),
            "size": self.hcloud_volume.size,
            "location": to_native(self.hcloud_volume.location.name),
            "labels": self.hcloud_volume.labels,
            "server": server_name,
            "linux_device": to_native(self.hcloud_volume.linux_device),
            "delete_protection": self.hcloud_volume.protection["delete"],
        }

    def _get_volume(self):
        try:
            if self.module.params.get("id") is not None:
                self.hcloud_volume = self.client.volumes.get_by_id(self.module.params.get("id"))
            else:
                self.hcloud_volume = self.client.volumes.get_by_name(self.module.params.get("name"))
        except HCloudException as exception:
            self.fail_json_hcloud(exception)

    def _create_volume(self):
        self.module.fail_on_missing_params(required_params=["name", "size"])
        params = {
            "name": self.module.params.get("name"),
            "size": self.module.params.get("size"),
            "automount": self.module.params.get("automount"),
            "format": self.module.params.get("format"),
            "labels": self.module.params.get("labels"),
        }
        if self.module.params.get("server") is not None:
            params["server"] = self.client.servers.get_by_name(self.module.params.get("server"))
        elif self.module.params.get("location") is not None:
            params["location"] = self.client.locations.get_by_name(self.module.params.get("location"))
        else:
            self.module.fail_json(msg="server or location is required")

        if not self.module.check_mode:
            try:
                resp = self.client.volumes.create(**params)
                resp.action.wait_until_finished()
                [action.wait_until_finished() for action in resp.next_actions]
                delete_protection = self.module.params.get("delete_protection")
                if delete_protection is not None:
                    self._get_volume()
                    self.hcloud_volume.change_protection(delete=delete_protection).wait_until_finished()
            except HCloudException as exception:
                self.fail_json_hcloud(exception)
        self._mark_as_changed()
        self._get_volume()

    def _update_volume(self):
        try:
            size = self.module.params.get("size")
            if size:
                if self.hcloud_volume.size < size:
                    if not self.module.check_mode:
                        self.hcloud_volume.resize(size).wait_until_finished()
                    self._mark_as_changed()
                elif self.hcloud_volume.size > size:
                    self.module.warn("Shrinking of volumes is not supported")

            server_name = self.module.params.get("server")
            if server_name:
                server = self.client.servers.get_by_name(server_name)
                if self.hcloud_volume.server is None or self.hcloud_volume.server.name != server.name:
                    if not self.module.check_mode:
                        automount = self.module.params.get("automount", False)
                        self.hcloud_volume.attach(server, automount=automount).wait_until_finished()
                    self._mark_as_changed()
            else:
                if self.hcloud_volume.server is not None:
                    if not self.module.check_mode:
                        self.hcloud_volume.detach().wait_until_finished()
                    self._mark_as_changed()

            labels = self.module.params.get("labels")
            if labels is not None and labels != self.hcloud_volume.labels:
                if not self.module.check_mode:
                    self.hcloud_volume.update(labels=labels)
                self._mark_as_changed()

            delete_protection = self.module.params.get("delete_protection")
            if delete_protection is not None and delete_protection != self.hcloud_volume.protection["delete"]:
                if not self.module.check_mode:
                    self.hcloud_volume.change_protection(delete=delete_protection).wait_until_finished()
                self._mark_as_changed()

            self._get_volume()
        except HCloudException as exception:
            self.fail_json_hcloud(exception)

    def present_volume(self):
        self._get_volume()
        if self.hcloud_volume is None:
            self._create_volume()
        else:
            self._update_volume()

    def delete_volume(self):
        try:
            self._get_volume()
            if self.hcloud_volume is not None:
                if not self.module.check_mode:
                    if self.hcloud_volume.server is not None:
                        self.hcloud_volume.detach().wait_until_finished()
                    self.client.volumes.delete(self.hcloud_volume)
                self._mark_as_changed()
            self.hcloud_volume = None
        except HCloudException as exception:
            self.fail_json_hcloud(exception)

    @classmethod
    def define_module(cls):
        return AnsibleModule(
            argument_spec=dict(
                id={"type": "int"},
                name={"type": "str"},
                size={"type": "int"},
                location={"type": "str"},
                server={"type": "str"},
                labels={"type": "dict"},
                automount={"type": "bool", "default": False},
                format={"type": "str", "choices": ["xfs", "ext4"]},
                delete_protection={"type": "bool"},
                state={
                    "choices": ["absent", "present"],
                    "default": "present",
                },
                **super().base_module_arguments()
            ),
            required_one_of=[["id", "name"]],
            mutually_exclusive=[["location", "server"]],
            supports_check_mode=True,
        )


def main():
    module = AnsibleHCloudVolume.define_module()

    hcloud = AnsibleHCloudVolume(module)
    state = module.params.get("state")
    if state == "absent":
        module.fail_on_missing_params(required_params=["name"])
        hcloud.delete_volume()
    else:
        hcloud.present_volume()

    module.exit_json(**hcloud.get_result())


if __name__ == "__main__":
    main()