"""Renderer for SQLFlow pipeline visualizations."""

from sqlflow.visualizer.dag_builder import PipelineDAG


class Renderer:
    """Renders DAG visualizations."""

    def render_html(self, dag: PipelineDAG, output_path: str) -> None:
        """Render a DAG as an interactive HTML visualization.

        Args:
        ----
            dag: PipelineDAG to render
            output_path: Path to write the HTML file

        """

    def render_dot(self, dag: PipelineDAG) -> str:
        """Render a DAG as a DOT graph.

        Args:
        ----
            dag: PipelineDAG to render

        Returns:
        -------
            DOT graph representation

        """
        dot = ["digraph G {"]

        for node_id in dag.get_all_nodes():
            attrs = dag.get_node_attributes(node_id)
            label = attrs.get("label", node_id)
            node_type = attrs.get("type", "unknown")

            style = ""
            if node_type == "source":
                style = 'style="filled" fillcolor="#e6f3ff"'
            elif node_type == "transform":
                style = 'style="filled" fillcolor="#e6ffe6"'
            elif node_type == "export":
                style = 'style="filled" fillcolor="#fff0e6"'

            dot.append(f'  "{node_id}" [label="{label}" {style}];')

        for node_id in dag.get_all_nodes():
            for successor in dag.get_successors(node_id):
                dot.append(f'  "{node_id}" -> "{successor}";')

        dot.append("}")
        return "\n".join(dot)

    def render_png(self, dag: PipelineDAG, output_path: str) -> None:
        """Render a DAG as a PNG image.

        Args:
        ----
            dag: PipelineDAG to render
            output_path: Path to write the PNG file

        """
