import io
from flask import current_app
from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain_core.output_parsers import StrOutputParser
from langchain_core.prompts import ChatPromptTemplate
import re
from langchain_core.runnables import RunnablePassthrough

from common.eveai_model.tracked_mistral_ocr_client import TrackedMistralOcrClient
from common.extensions import minio_client
from common.utils.model_utils import create_language_template, get_embedding_llm, get_template
from .base_processor import BaseProcessor
from common.utils.business_event_context import current_event
from .processor_registry import ProcessorRegistry


class AutomagicHTMLProcessor(BaseProcessor):
    def __init__(self, tenant, document_version, catalog, processor):
        super().__init__(tenant, document_version, catalog, processor)

        self.chunk_size = catalog.max_chunk_size
        self.chunk_overlap = 0
        self.tuning = self.processor.tuning

        self.prompt_params = {
            "custom_instructions": self.processor.configuration.get("custom_instructions", ""),
        }
        template, llm = get_template("automagic_html_parse")

        translation_prompt = ChatPromptTemplate.from_template(template)
        setup = RunnablePassthrough()
        output_parser = StrOutputParser()
        self.chain = (setup | translation_prompt | llm | output_parser)


    def process(self):
        self._log("Starting Automagic HTML processing")
        try:
            # Get HTML-file data
            file_data = minio_client.download_document_file(
                self.tenant.id,
                self.document_version.bucket_name,
                self.document_version.object_name,
            )

            # Invoke HTML Processing Agent
            self.prompt_params["html"] = file_data
            with current_event.create_span("Markdown Generation"):
                markdown = self.chain.invoke(self.prompt_params)
            self._save_markdown(markdown)

            # Retrieve Title
            match = re.search(r'^# (.+)', markdown, re.MULTILINE)
            title = match.group(1).strip() if match else None

            self._log("Finished Automagic HTML Processing")
            return markdown, title
        except Exception as e:
            self._log(f"Error automagically processing HTML: {str(e)}", level='error')
            raise


# Register the processor
ProcessorRegistry.register("AUTOMAGIC_HTML_PROCESSOR", AutomagicHTMLProcessor)