"""
generator/github_actions_generator.py
----------------------------------------
Renders github-actions.yml (lint/test/build/push/deploy), with the
build-and-push and deploy steps adapted to the selected deployment
target's real deploy mechanics — fully deterministic, no AI involvement.

GitHub Actions expression syntax (`${{ ... }}`) uses the same double-
curly-brace delimiters as Jinja2. To avoid Jinja2 trying to parse those
as its own template expressions, every `${{ ... }}` token is built as a
plain Python string here and passed into the template as a variable —
the .j2 file itself never contains a literal `${{ }}`.
"""

from __future__ import annotations

from utils.config import InfraConfig
from utils.template_env import get_env
from rules.kubernetes_rules import sanitize_dns_label


class GitHubActionsGenerator:
    """Generates a CI/CD workflow, adapted to the selected deployment target."""

    TEMPLATE_NAME = "github_actions/workflow.yml.j2"

    def generate(self, config: InfraConfig) -> str:
        namespace = sanitize_dns_label(config.project_name)
        image_tag = f"REGISTRY/{namespace}-app:" + "${{ github.sha }}"

        template = get_env().get_template(self.TEMPLATE_NAME)
        return template.render(
            deployment_target=config.deployment_target,
            cloud_provider=config.cloud_provider,
            namespace=namespace,
            image_tag=image_tag,
            gcp_sa_key_expr="${{ secrets.GCP_SA_KEY }}",
            registry_username_expr="${{ secrets.REGISTRY_USERNAME }}",
            registry_password_expr="${{ secrets.REGISTRY_PASSWORD }}",
        )