import logging
from pathlib import Path
import cmd
import shlex
import hydra
from omegaconf import DictConfig, OmegaConf
from art import tprint
import utils

log = logging.getLogger(__name__)

class CLIApp(cmd.Cmd):

    class CleanExit:
        def __init__(self, cliapp):
            self.cliapp = cliapp
        def __enter__(self):
            return self
        def __exit__(self, exc_type, exc_value, exc_tb):
            if exc_type is KeyboardInterrupt:
                    print("\n", end="")
                    self.cliapp.do_exit(None)
                    return True
            return exc_type is None

    prompt = '> '
    intro = """Running in interactive mode:
Welcome to the LLM4SciLit shell. Type help or ? to list commands.\n"""

    def __init__(self, app, cfg : DictConfig) -> None:
        super().__init__()
        self.app = app
        self.cfg = cfg

    def do_exit(self, _):
        """Exit the shell."""
        # self.app.vector_store.save(self.cfg.storage_path.vector_store)
        print("\nLLM4SciLit: Bye!\n")
        self.app.exit()
        return True
    do_EOF = do_exit

    def do_ask_paper(self, line):
        """Ask a question about a paper."""
        paper, line = shlex.split(line)
        filter_dict = {"paper_title": paper}
        print(f"\nLLM4SciLit: {self.app.qa_model.answer_question(line, filter_dict)['result']}\n")

    def default(self, line):
        # print(f"\nLLM4SciLit: a bunch of nonsense\n")
        print(f"\nLLM4SciLit: {self.app.qa_model.answer_question(line, {})['result']}\n")


class App:
    def __init__(self, cfg : DictConfig) -> None:
        self.cfg = cfg

        log.info("Loading: Document Loader")
        self.loader = hydra.utils.instantiate(cfg.document_loader)
        log.info("Loading: Text Splitter")
        self.splitter = hydra.utils.instantiate(cfg.text_splitter)
        log.info("Loading: Text Embedding Model")
        self.text_embedding_model = hydra.utils.instantiate(cfg.text_embedding)
        log.info("Loading: Vector Store")
        self.vector_store = hydra.utils.instantiate(cfg.vector_store, self.text_embedding_model)
        log.info("Loading: Document Retriever")
        self.retriever = hydra.utils.instantiate(cfg.document_retriever, self.vector_store)
        log.info("Loading: Question Answering Model")
        self.qa_model = hydra.utils.instantiate(cfg.question_answering, self.retriever)

    def _bootstrap(self) -> None:
        # if vector store does not exist, create it
        # if vector store exists, load it
        
        if not Path(self.cfg.storage_path.vector_store).exists() or self.cfg.debug.force_rebuild_storage:
            message = (
                "Vector store not found at %s. Building storage from scratch"
                if not self.cfg.debug.force_rebuild_storage
                else "Forced to rebuild storage. Building storage from scratch"
            )
            log.info(message, self.cfg.storage_path.vector_store)

            docs = self.loader.load_documents(self.cfg.storage_path.documents)
            docs = self.splitter.split_documents(docs)
            utils.save_docs_to_jsonl(docs, self.cfg.storage_path.documents_processed)

            self.vector_store.initialize_from_documents(docs)
            self.vector_store.save(self.cfg.storage_path.vector_store)
        else:
            log.info("Vector store found at %s. Loading existing storage", self.cfg.storage_path.vector_store)
            self.vector_store.initialize_from_file(self.cfg.storage_path.vector_store)
        
        self.retriever.initialize()
        self.qa_model.initialize()
        print("Ready to answer your questions 🔥🔥\n")


    ##################################################################################################
    # App functionalities

    def ask_paper(self, line):
        """Ask a question about a paper."""
        paper, line = shlex.split(line)
        filter_dict = {"paper_title": paper}
        print(f"\nLLM4SciLit: {self.qa_model.answer_question(line, filter_dict)['result']}\n")

    def ask(self, line):
        # print(f"\nLLM4SciLit: a bunch of nonsense\n")
        print(f"\nLLM4SciLit: {self.qa_model.answer_question(line, {})['result']}\n")
    
    def ask_chat(self, line, history):
        # print(f"\nLLM4SciLit: a bunch of nonsense\n")
        return self.qa_model.answer_question(line, {})['result']


    ##################################################################################################
    # App modes        

    def run_interactive(self) -> None:
        self._bootstrap()
        cli = CLIApp(self, self.cfg)
        with CLIApp.CleanExit(cli):
            cli.cmdloop()

    def exit(self):
        """
            Do any cleanup here
        """

@hydra.main(version_base=None, config_path="../config", config_name="config")
def main(cfg : DictConfig) -> None:
    tprint("LLM4SciLit")

    if cfg.debug.is_debug:
        print("Running with config:")
        print(OmegaConf.to_yaml(cfg))

    app = App(cfg)
    match cfg.mode:
        case "interactive":
            app.run_interactive()
        case _:
            raise ValueError(f"Unknown mode: {cfg.mode}")

if __name__ == "__main__":
    main() # pylint: disable=E1120:no-value-for-parameter