feat: support Podcast generation

src/podcast/graph/script_writer_node.py

@@ -0,0 +1,27 @@
+import logging
+
+from langchain.schema import HumanMessage, SystemMessage
+
+from src.config.agents import AGENT_LLM_MAP
+from src.llms.llm import get_llm_by_type
+from src.prompts.template import get_prompt_template
+
+from ..types import Script
+from .state import PodcastState
+
+logger = logging.getLogger(__name__)
+
+
+def script_writer_node(state: PodcastState):
+    logger.info("Generating script for podcast...")
+    model = get_llm_by_type(
+        AGENT_LLM_MAP["podcast_script_writer"]
+    ).with_structured_output(Script)
+    script = model.invoke(
+        [
+            SystemMessage(content=get_prompt_template("podcast_script_writer")),
+            HumanMessage(content=state["input"]),
+        ],
+    )
+    logging.info(script)
+    return {"script": script, "audio_chunks": []}