from typing import Optional

import yaml
from flask_login import current_user

from extensions.ext_database import db
from models.dataset import PipelineCustomizedTemplate
from services.rag_pipeline.pipeline_template.pipeline_template_base import PipelineTemplateRetrievalBase
from services.rag_pipeline.pipeline_template.pipeline_template_type import PipelineTemplateType


class CustomizedPipelineTemplateRetrieval(PipelineTemplateRetrievalBase):
    """
    Retrieval recommended app from database
    """

    def get_pipeline_templates(self, language: str) -> dict:
        result = self.fetch_pipeline_templates_from_customized(
            tenant_id=current_user.current_tenant_id, language=language
        )
        return result

    def get_pipeline_template_detail(self, template_id: str):
        result = self.fetch_pipeline_template_detail_from_db(template_id)
        return result

    def get_type(self) -> str:
        return PipelineTemplateType.CUSTOMIZED

    @classmethod
    def fetch_pipeline_templates_from_customized(cls, tenant_id: str, language: str) -> dict:
        """
        Fetch pipeline templates from db.
        :param tenant_id: tenant id
        :param language: language
        :return:
        """
        pipeline_customized_templates = (
            db.session.query(PipelineCustomizedTemplate)
            .filter(PipelineCustomizedTemplate.tenant_id == tenant_id, PipelineCustomizedTemplate.language == language)
            .order_by(PipelineCustomizedTemplate.position.asc(), PipelineCustomizedTemplate.created_at.desc())
            .all()
        )
        recommended_pipelines_results = []
        for pipeline_customized_template in pipeline_customized_templates:
            recommended_pipeline_result = {
                "id": pipeline_customized_template.id,
                "name": pipeline_customized_template.name,
                "description": pipeline_customized_template.description,
                "icon": pipeline_customized_template.icon,
                "position": pipeline_customized_template.position,
                "chunk_structure": pipeline_customized_template.chunk_structure,
            }
            recommended_pipelines_results.append(recommended_pipeline_result)

        return {"pipeline_templates": recommended_pipelines_results}

    @classmethod
    def fetch_pipeline_template_detail_from_db(cls, template_id: str) -> Optional[dict]:
        """
        Fetch pipeline template detail from db.
        :param template_id: Template ID
        :return:
        """
        pipeline_template = (
            db.session.query(PipelineCustomizedTemplate).filter(PipelineCustomizedTemplate.id == template_id).first()
        )
        if not pipeline_template:
            return None

        dsl_data = yaml.safe_load(pipeline_template.yaml_content)
        graph_data = dsl_data.get("workflow", {}).get("graph", {})

        return {
            "id": pipeline_template.id,
            "name": pipeline_template.name,
            "icon_info": pipeline_template.icon,
            "description": pipeline_template.description,
            "chunk_structure": pipeline_template.chunk_structure,
            "export_data": pipeline_template.yaml_content,
            "graph": graph_data,
            "created_by": pipeline_template.created_user_name,
        }