from langgraph.graph import START, END, StateGraph

from blogGenerator.state.state import State
from blogGenerator.nodes.route_deciding_node import RouteDecidingNode
from blogGenerator.nodes.yt_transcript_node import YTTranscriptNode
from blogGenerator.nodes.content_generator_node import ContentGeneratorNode


class GraphBuilder:
    def __init__(self, model):
        self.llm = model
        self.graph_builder = StateGraph(State)

    def blog_generator_build_graph(self):
        """
        Build a blog generation graph
        """

        # print("Build a blog generation graph.......")
        try:
            self.route_deciding_node = RouteDecidingNode(self.llm)
            self.yt_transcript_node = YTTranscriptNode()
            self.content_generator_node = ContentGeneratorNode(self.llm)

            self.graph_builder.add_node("Router", self.route_deciding_node.process)
            self.graph_builder.add_node(
                "YT Transcript", self.yt_transcript_node.process
            )
            self.graph_builder.add_node(
                "Generate Blog", self.content_generator_node.process
            )

            self.graph_builder.add_edge(START, "Router")
            self.graph_builder.add_conditional_edges(
                "Router",
                self.route_deciding_node.route_decision,
                {"youtube": "YT Transcript", "topic": "Generate Blog"},
            )
            self.graph_builder.add_edge("YT Transcript", "Generate Blog")
            self.graph_builder.add_edge("Generate Blog", END)

        except Exception as e:
            print(f"Error : {e}")

    def setup_graph(self):
        self.blog_generator_build_graph()

        return self.graph_builder.compile()