# -*- coding: utf-8 -*-

from typing import Any

import abc

from jwutils.log import *
from jwutils.misc import load_classes
from jwutils.Cmds import Cmds
from jwutils.db.DataBase import DataBase
from jwutils.db.query.Query import Query as QueryBase
from jwutils.db.query.QueryResult import QueryResult
from jwutils.db.schema.Schema import Schema

class Queries(abc.ABC): # export

    class Query(QueryBase):

        def __init__(self: Any, query: QueryBase, name: str, location: str, func: Any):
            self.__query = query
            self.__func = func
            self.__location = location
            self.__name = name

        # -- implement API

        def _run(self, *args, **kwargs) -> QueryResult:
            return self.__func(*args, **kwargs)

        def _register(self):
            raise Exception('Can\'t call register on this object')

        def _column_names(self) -> list[str]:
            return self.__query.column_names

        @property
        def name(self):
            return self.__name

    def __init__(self, db: DataBase) -> None:
        assert(isinstance(db, DataBase))
        self.__db = db
        self.__queries: dict[str, Any] = dict()

    def __getitem__(self, name) -> Query:
        try:
            return self.__queries[name]
        except Exception as e:
            slog(ERR, f'Failed to retrieve query {name} ({e})')
            slog_m(ERR, '\n'.join(self.__queries.keys()))
            raise

    @property
    def db(self) -> DataBase:
        return self.__db

    @property
    def app(self) -> Cmds:
        return self.__db.app

    def load(self, modules: list[str], cls=QueryBase):
        for path in modules:
            slog(INFO, f'Loading modules from {path}')
            for c in load_classes(path, cls):
                c(self).register()

    @property
    def schema(self) -> Schema:
        return self.__db.schema

    def add(self, query: QueryBase, query_name: str, location: str, func: Any):
        slog(INFO, f'Adding query "{query_name}" on location "{location}"')
        assert(isinstance(query_name, str))
        assert(isinstance(location, str))
        #ret = self.Query(query, func)
        ret = self.Query(query, query_name, location, func)
        #setattr(ret, 'name', name)
        self.__queries[query_name] = ret
        self._add(ret)

    # To be overriden in case the derived class wants to keep track
    def _add(self, query):
        pass

#    def register(self):
#        return self._register()
#
#    def query(self, *args, **kwargs):
#        return self.app.query(*args, **kwargs)
#
#    def pages(self, *args, **kwargs):
#        return self.app.pages(*args, **kwargs)
#