#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from typing import Self, Any, Optional
from Interfaces.Application.CXCVInterface import CXCVInterface
from Models.ResultsModel import ResultsModel
from Abstracts.DatabasesAbstract import DatabasesAbstract
from Utils.Patterns import RE
from Utils.Utils import Utils
from sqlite3 import Connection, Cursor, connect as sqlite_connect
from re import Match as REMatch

class SQLiteDriver(DatabasesAbstract):

    def __init__(self:Self, 
        cxcv:CXCVInterface,
        key:str, 
        inputs:dict[str, Any|None]|list[Any|None]|tuple[Any|None, ...]
    ) -> None:
        super().__init__(cxcv, key, inputs)
        self.__connection:Connection|None = None
        self.__path:str = Utils.get_value("path", inputs)
        build_file:str|None = Utils.get_value("builder_file", inputs)
        self.__in_use:bool = False

        self.connect()

        build_file is None or self.execute_file(build_file)
        
    def connect(self:Self) -> bool:
        if self.__connection is None:
            try:

                directory:str = self.cxcv.files.get_directory_path(self.__path)

                self.cxcv.files.prepare_path(directory)
                self.__connection = sqlite_connect(self.__path, check_same_thread = False)

            except Exception as exception:
                self.cxcv.exception(exception, "database_driver_connection_exception")
                return False
        return True
    
    def close(self:Self) -> bool:
        try:
            if self.__connection:
                self.__connection.execute("PRAGMA wal_checkpoint(FULL);")
                self.__connection.close()
                self.__connection = None
        except Exception as exception:
            self.cxcv.exception(exception, "database_driver_close_exception")
            return False
        return True

    @staticmethod
    def build_match(matches:REMatch, parameters:dict[str, Any|None]) -> str:
            
        value:Any|None = parameters.get(matches.group(1), matches.group(0))
        
        return (
            "null" if value is None else 
            "'" + str(value).replace("'", "''") + "'" if isinstance(value, str) else 
        str(value))

    @classmethod
    def prepare(cls:type[Self], 
        sql:str, 
        parameters:Optional[dict[str, Any|None]] = None, 
        builder:Optional[dict[str, Any|None]] = None
    ) -> list[str]:

        queries:list[str] = [""]
        has_parameters:bool = parameters is not None

        if builder:
            sql = Utils.string_variables(sql, builder)
        
        while len(sql):
            
            comment:str|None
            fragment:str|None
            string:str|None
            separator:str|None
            matches:REMatch = RE.SQL_LITE.search(sql)

            comment, fragment, string, separator = matches.groups()

            if comment is None:
                if separator is None:
                    queries[-1] += fragment or string or ""
                else:
                    queries[-1] = queries[-1].strip()
                    if len(queries[-1]):
                        queries[-1] += ";"
                        queries.append("")
            
            sql = sql[matches.end():]
        
        return [(
            RE.STRING_VARIABLE.sub(
                lambda matches:cls.build_match(matches, parameters), 
                subsql
            ) if has_parameters else 
        subsql) for subsql in queries if len(subsql)]
    
    def execute(self:Self, 
        query:str, 
        parameters:Optional[dict[str, Any|None]] = None, 
        builder:Optional[dict[str, Any|None]] = None
    ) -> ResultsModel:
        
        while self.__in_use and self.cxcv.working:
            self.cxcv.wait(.01, .1)
        self.__in_use = True

        cursor:Cursor = self.__connection.cursor()
        results:ResultsModel = ResultsModel()

        try:

            for subquery in self.prepare(query, parameters, builder):

                order:str = subquery[:7].lower()

                try:
                    cursor.execute(subquery)
                except Exception as exception:
                    print(subquery)
                    self.cxcv.exception(exception, "database_driver_execute_subquery_exception", {
                        "subquery" : subquery
                    })
                    continue

                if order == "insert ":
                    self.__in_use = False
                    results.ids.append(self.get_last_id())
                elif order in ("select ", "with   "):
                    results.set(cursor.fetchall(), Type=tuple(column[0] for column in cursor.description))

            self.__connection.commit()
            cursor.close()

        except Exception as exception:
            self.cxcv.exception(exception, "database_driver_execute_exception", {
                "query" : query,
                "parameters" : parameters
            })

        self.__in_use = False

        return results
    
    def execute_file(self:Self, 
        path:str, 
        parameters:Optional[dict[str, Any|None]] = None, 
        builder:Optional[dict[str, Any|None]] = None
    ) -> ResultsModel:
        return self.execute(self.cxcv.files.load(path, "r"), parameters, builder)
    
    def get(self:Self, 
        query:str, 
        parameters:Optional[dict[str, Any|None]] = None, 
        builder:Optional[dict[str, Any|None]] = None
    ) -> Any|None:
        return self.execute(query, parameters, builder).get(0)
    
    def get_id(self:Self, 
        query:str, 
        parameters:Optional[dict[str, Any|None]] = None, 
        builder:Optional[dict[str, Any|None]] = None
    ) -> int|None:
        
        value:Any|None = self.get(query, parameters, builder)

        return int(value) if value is not None else None
    
    def get_last_id(self:Self) -> int|None:
        return self.get_id("select last_insert_rowid();")