import datetime
from typing import List

from sqlalchemy import and_
from sqlalchemy.orm import load_only

from apps.chat.models.chat_model import Chat, ChatRecord, CreateChat, ChatInfo, RenameChat, ChatQuestion
from apps.datasource.models.datasource import CoreDatasource
from common.core.deps import SessionDep, CurrentUser


def list_chats(session: SessionDep, current_user: CurrentUser) -> List[Chat]:
    chart_list = session.query(Chat).filter(Chat.create_by == current_user.id).order_by(
        Chat.create_time.desc()).all()
    return chart_list


def rename_chat(session: SessionDep, rename_object: RenameChat) -> str:
    chat = session.query(Chat).filter(Chat.id == rename_object.id).first()
    if not chat:
        raise Exception(f"Chat with id {rename_object.id} not found")

    chat.brief = rename_object.brief.strip()[:20]
    session.add(chat)
    session.flush()
    session.refresh(chat)

    brief = chat.brief
    session.commit()
    return brief


def delete_chat(session, chart_id) -> str:
    chat = session.query(Chat).filter(Chat.id == chart_id).first()
    if not chat:
        return f'Chat with id {chart_id} has been deleted'

    session.delete(chat)
    session.commit()

    return f'Chat with id {chart_id} has been deleted'


def get_chat_with_records(session: SessionDep, chart_id: int, current_user: CurrentUser) -> ChatInfo:
    chat = session.query(Chat).filter(Chat.id == chart_id).first()
    if not chat:
        raise Exception(f"Chat with id {chart_id} not found")

    chat_info = ChatInfo(**chat.model_dump())

    ds = session.query(CoreDatasource).filter(CoreDatasource.id == chat.datasource).first()
    if not ds:
        chat_info.datasource_exists = False
        chat_info.datasource_name = 'Datasource not exist'
    else:
        chat_info.datasource_exists = True
        chat_info.datasource_name = ds.name

    record_list = session.query(ChatRecord).options(
        load_only(ChatRecord.id, ChatRecord.chat_id, ChatRecord.create_time, ChatRecord.finish_time,
                  ChatRecord.question, ChatRecord.sql_answer, ChatRecord.sql, ChatRecord.data,
                  ChatRecord.chart_answer, ChatRecord.chart, ChatRecord.analysis, ChatRecord.predict,
                  ChatRecord.datasource_select_answer, ChatRecord.recommended_question_answer,
                  ChatRecord.recommended_question, ChatRecord.first_chat,
                  ChatRecord.predict_data, ChatRecord.finish, ChatRecord.error, ChatRecord.run_time)).filter(
        and_(Chat.create_by == current_user.id, ChatRecord.chat_id == chart_id)).order_by(ChatRecord.create_time).all()

    chat_info.records = record_list

    return chat_info


def list_records(session: SessionDep, chart_id: int, current_user: CurrentUser) -> List[ChatRecord]:
    record_list = session.query(ChatRecord).filter(
        and_(Chat.create_by == current_user.id, ChatRecord.chat_id == chart_id)).order_by(ChatRecord.create_time).all()
    return record_list


def create_chat(session: SessionDep, current_user: CurrentUser, create_chat_obj: CreateChat,
                require_datasource: bool = True) -> ChatInfo:
    if not create_chat_obj.datasource and require_datasource:
        raise Exception("Datasource cannot be None")

    if not create_chat_obj.question or create_chat_obj.question.strip() == '':
        create_chat_obj.question = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

    chat = Chat(create_time=datetime.datetime.now(),
                create_by=current_user.id,
                brief=create_chat_obj.question.strip()[:20])
    ds: CoreDatasource | None = None
    if create_chat_obj.datasource:
        chat.datasource = create_chat_obj.datasource
        ds = session.query(CoreDatasource).filter(CoreDatasource.id == create_chat_obj.datasource).first()

        if not ds:
            raise Exception(f"Datasource with id {create_chat_obj.datasource} not found")

        chat.engine_type = ds.type_name
    else:
        chat.engine_type = ''

    chat_info = ChatInfo(**chat.model_dump())

    session.add(chat)
    session.flush()
    session.refresh(chat)
    chat_info.id = chat.id
    session.commit()

    if ds:
        chat_info.datasource_exists = True
        chat_info.datasource_name = ds.name

    if require_datasource and ds:
        # generate first empty record
        record = ChatRecord()
        record.chat_id = chat.id
        record.datasource = ds.id
        record.engine_type = ds.type_name
        record.first_chat = True
        record.finish = True
        record.create_time = datetime.datetime.now()
        record.create_by = current_user.id

        _record = ChatRecord(**record.model_dump())

        session.add(record)
        session.flush()
        session.refresh(record)
        _record.id = record.id
        session.commit()

        # todo suggest questions

        chat_info.records.append(_record)

    return chat_info


def save_question(session: SessionDep, current_user: CurrentUser, question: ChatQuestion) -> ChatRecord:
    if not question.chat_id:
        raise Exception("ChatId cannot be None")
    if not question.question or question.question.strip() == '':
        raise Exception("Question cannot be Empty")

    chat = session.query(Chat).filter(Chat.id == question.chat_id).first()
    if not chat:
        raise Exception(f"Chat with id {question.chat_id} not found")

    record = ChatRecord()
    record.question = question.question
    record.chat_id = chat.id
    record.create_time = datetime.datetime.now()
    record.create_by = current_user.id
    record.datasource = chat.datasource
    record.engine_type = chat.engine_type
    record.ai_modal_id = question.ai_modal_id

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)
    result.id = record.id
    session.commit()

    return result


def save_full_sql_message(session: SessionDep, record_id: int, full_message: str) -> ChatRecord:
    return save_full_sql_message_and_answer(session=session, record_id=record_id, full_message=full_message, answer='')


def save_full_sql_message_and_answer(session: SessionDep, record_id: int, answer: str, full_message: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.full_sql_message = full_message
    record.sql_answer = answer

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_full_analysis_message_and_answer(session: SessionDep, record_id: int, answer: str,
                                          full_message: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.full_analysis_message = full_message
    record.analysis = answer

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_full_predict_message_and_answer(session: SessionDep, record_id: int, answer: str,
                                         full_message: str, data: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.full_predict_message = full_message
    record.predict = answer
    record.predict_data = data

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_full_select_datasource_message_and_answer(session: SessionDep, record_id: int, answer: str,
                                                   full_message: str, datasource: int = None,
                                                   engine_type: str = None) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.full_select_datasource_message = full_message
    record.datasource_select_answer = answer

    if datasource:
        record.datasource = datasource
        record.engine_type = engine_type

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_sql(session: SessionDep, record_id: int, sql: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.sql = sql

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_full_chart_message(session: SessionDep, record_id: int, full_message: str) -> ChatRecord:
    return save_full_chart_message_and_answer(session=session, record_id=record_id, full_message=full_message,
                                              answer='')


def save_full_chart_message_and_answer(session: SessionDep, record_id: int, answer: str,
                                       full_message: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.full_chart_message = full_message
    record.chart_answer = answer

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_chart(session: SessionDep, record_id: int, chart: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.chart = chart

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_predict_data(session: SessionDep, record_id: int, data: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.predict_data = data

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_error_message(session: SessionDep, record_id: int, message: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.error = message
    record.finish = True
    record.finish_time = datetime.datetime.now()

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def save_sql_exec_data(session: SessionDep, record_id: int, data: str) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.data = data

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result


def finish_record(session: SessionDep, record_id: int) -> ChatRecord:
    if not record_id:
        raise Exception("Record id cannot be None")
    record = session.query(ChatRecord).filter(ChatRecord.id == record_id).first()
    record.finish = True
    record.finish_time = datetime.datetime.now()

    result = ChatRecord(**record.model_dump())

    session.add(record)
    session.flush()
    session.refresh(record)

    session.commit()

    return result