from starlette_context import context

from pr_agent.config_loader import get_settings
from pr_agent.git_providers.azuredevops_provider import AzureDevopsProvider
from pr_agent.git_providers.bitbucket_provider import BitbucketProvider
from pr_agent.git_providers.bitbucket_server_provider import \
    BitbucketServerProvider
from pr_agent.git_providers.codecommit_provider import CodeCommitProvider
from pr_agent.git_providers.gerrit_provider import GerritProvider
from pr_agent.git_providers.git_provider import GitProvider
from pr_agent.git_providers.github_provider import GithubProvider
from pr_agent.git_providers.gitlab_provider import GitLabProvider
from pr_agent.git_providers.local_git_provider import LocalGitProvider

_GIT_PROVIDERS = {
    'github': GithubProvider,
    'gitlab': GitLabProvider,
    'bitbucket': BitbucketProvider,
    'bitbucket_server': BitbucketServerProvider,
    'azure': AzureDevopsProvider,
    'codecommit': CodeCommitProvider,
    'local': LocalGitProvider,
    'gerrit': GerritProvider,
}


def get_git_provider():
    try:
        provider_id = get_settings().config.git_provider
    except AttributeError as e:
        raise ValueError("git_provider is a required attribute in the configuration file") from e
    if provider_id not in _GIT_PROVIDERS:
        raise ValueError(f"Unknown git provider: {provider_id}")
    return _GIT_PROVIDERS[provider_id]


def get_git_provider_with_context(pr_url) -> GitProvider:
    """
    Get a GitProvider instance for the given PR URL. If the GitProvider instance is already in the context, return it.
    """

    is_context_env = None
    try:
        is_context_env = context.get("settings", None)
    except Exception:
        pass  # we are not in a context environment (CLI)

    # check if context["git_provider"]["pr_url"] exists
    if is_context_env and context.get("git_provider", {}).get("pr_url", {}):
        git_provider = context["git_provider"]["pr_url"]
        # possibly check if the git_provider is still valid, or if some reset is needed
        # ...
        return git_provider
    else:
        try:
            provider_id = get_settings().config.git_provider
            if provider_id not in _GIT_PROVIDERS:
                raise ValueError(f"Unknown git provider: {provider_id}")
            git_provider = _GIT_PROVIDERS[provider_id](pr_url)
            if is_context_env:
                context["git_provider"] = {pr_url: git_provider}
            return git_provider
        except Exception as e:
            raise ValueError(f"Failed to get git provider for {pr_url}") from e