from typing import Any, cast, Dict, Optional, TYPE_CHECKING, Union

import requests

from gitlab import cli
from gitlab import exceptions as exc
from gitlab.base import RequiredOptional, RESTManager, RESTObject
from gitlab.mixins import CreateMixin, ListMixin, RefreshMixin, RetrieveMixin

from .discussions import ProjectCommitDiscussionManager  # noqa: F401

__all__ = [
    "ProjectCommit",
    "ProjectCommitManager",
    "ProjectCommitComment",
    "ProjectCommitCommentManager",
    "ProjectCommitStatus",
    "ProjectCommitStatusManager",
]


class ProjectCommit(RESTObject):
    _short_print_attr = "title"

    comments: "ProjectCommitCommentManager"
    discussions: ProjectCommitDiscussionManager
    statuses: "ProjectCommitStatusManager"

    @cli.register_custom_action("ProjectCommit")
    @exc.on_http_error(exc.GitlabGetError)
    def diff(self, **kwargs: Any) -> Union[Dict[str, Any], requests.Response]:
        """Generate the commit diff.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabGetError: If the diff could not be retrieved

        Returns:
            The changes done in this commit
        """
        path = f"{self.manager.path}/{self.get_id()}/diff"
        return self.manager.gitlab.http_get(path, **kwargs)

    @cli.register_custom_action("ProjectCommit", ("branch",))
    @exc.on_http_error(exc.GitlabCherryPickError)
    def cherry_pick(self, branch: str, **kwargs: Any) -> None:
        """Cherry-pick a commit into a branch.

        Args:
            branch: Name of target branch
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabCherryPickError: If the cherry-pick could not be performed
        """
        path = f"{self.manager.path}/{self.get_id()}/cherry_pick"
        post_data = {"branch": branch}
        self.manager.gitlab.http_post(path, post_data=post_data, **kwargs)

    @cli.register_custom_action("ProjectCommit", optional=("type",))
    @exc.on_http_error(exc.GitlabGetError)
    def refs(
        self, type: str = "all", **kwargs: Any
    ) -> Union[Dict[str, Any], requests.Response]:
        """List the references the commit is pushed to.

        Args:
            type: The scope of references ('branch', 'tag' or 'all')
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabGetError: If the references could not be retrieved

        Returns:
            The references the commit is pushed to.
        """
        path = f"{self.manager.path}/{self.get_id()}/refs"
        data = {"type": type}
        return self.manager.gitlab.http_get(path, query_data=data, **kwargs)

    @cli.register_custom_action("ProjectCommit")
    @exc.on_http_error(exc.GitlabGetError)
    def merge_requests(self, **kwargs: Any) -> Union[Dict[str, Any], requests.Response]:
        """List the merge requests related to the commit.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabGetError: If the references could not be retrieved

        Returns:
            The merge requests related to the commit.
        """
        path = f"{self.manager.path}/{self.get_id()}/merge_requests"
        return self.manager.gitlab.http_get(path, **kwargs)

    @cli.register_custom_action("ProjectCommit", ("branch",))
    @exc.on_http_error(exc.GitlabRevertError)
    def revert(
        self, branch: str, **kwargs: Any
    ) -> Union[Dict[str, Any], requests.Response]:
        """Revert a commit on a given branch.

        Args:
            branch: Name of target branch
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabRevertError: If the revert could not be performed

        Returns:
            The new commit data (*not* a RESTObject)
        """
        path = f"{self.manager.path}/{self.get_id()}/revert"
        post_data = {"branch": branch}
        return self.manager.gitlab.http_post(path, post_data=post_data, **kwargs)

    @cli.register_custom_action("ProjectCommit")
    @exc.on_http_error(exc.GitlabGetError)
    def signature(self, **kwargs: Any) -> Union[Dict[str, Any], requests.Response]:
        """Get the signature of the commit.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabGetError: If the signature could not be retrieved

        Returns:
            The commit's signature data
        """
        path = f"{self.manager.path}/{self.get_id()}/signature"
        return self.manager.gitlab.http_get(path, **kwargs)


class ProjectCommitManager(RetrieveMixin, CreateMixin, RESTManager):
    _path = "/projects/{project_id}/repository/commits"
    _obj_cls = ProjectCommit
    _from_parent_attrs = {"project_id": "id"}
    _create_attrs = RequiredOptional(
        required=("branch", "commit_message", "actions"),
        optional=("author_email", "author_name"),
    )

    def get(
        self, id: Union[str, int], lazy: bool = False, **kwargs: Any
    ) -> ProjectCommit:
        return cast(ProjectCommit, super().get(id=id, lazy=lazy, **kwargs))


class ProjectCommitComment(RESTObject):
    _id_attr = None
    _short_print_attr = "note"


class ProjectCommitCommentManager(ListMixin, CreateMixin, RESTManager):
    _path = "/projects/{project_id}/repository/commits/{commit_id}/comments"
    _obj_cls = ProjectCommitComment
    _from_parent_attrs = {"project_id": "project_id", "commit_id": "id"}
    _create_attrs = RequiredOptional(
        required=("note",), optional=("path", "line", "line_type")
    )


class ProjectCommitStatus(RefreshMixin, RESTObject):
    pass


class ProjectCommitStatusManager(ListMixin, CreateMixin, RESTManager):
    _path = "/projects/{project_id}/repository/commits/{commit_id}/statuses"
    _obj_cls = ProjectCommitStatus
    _from_parent_attrs = {"project_id": "project_id", "commit_id": "id"}
    _create_attrs = RequiredOptional(
        required=("state",),
        optional=("description", "name", "context", "ref", "target_url", "coverage"),
    )

    @exc.on_http_error(exc.GitlabCreateError)
    def create(
        self, data: Optional[Dict[str, Any]] = None, **kwargs: Any
    ) -> ProjectCommitStatus:
        """Create a new object.

        Args:
            data: Parameters to send to the server to create the
                         resource
            **kwargs: Extra options to send to the server (e.g. sudo or
                      'ref_name', 'stage', 'name', 'all')

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabCreateError: If the server cannot perform the request

        Returns:
            A new instance of the manage object class build with
                the data sent by the server
        """
        # project_id and commit_id are in the data dict when using the CLI, but
        # they are missing when using only the API
        # See #511
        base_path = "/projects/{project_id}/statuses/{commit_id}"
        path: Optional[str]
        if data is not None and "project_id" in data and "commit_id" in data:
            path = base_path.format(**data)
        else:
            path = self._compute_path(base_path)
        if TYPE_CHECKING:
            assert path is not None
        return cast(
            ProjectCommitStatus, CreateMixin.create(self, data, path=path, **kwargs)
        )