import mariadb
from PySide6.QtWidgets import QHBoxLayout, QCheckBox


class KontorModelConfig:

    def __init__(self, db_config, main_window, table_name: str):
        self.header = {}
        self.filter = {}
        self.main_window = main_window
        self._table = table_name
        self._table_id = None
        self.db_conn = mariadb.connect(
            host=db_config['mariadb']['host'],
            port=db_config['mariadb']['port'],
            user=db_config['mariadb']['user'],
            password=db_config['mariadb']['password'],
            database=db_config['mariadb']['database']
        )
        self.get_table_config()

    def get_table_id(self):
        if self._table_id is not None:
            return
        cursor = self.db_conn.cursor()
        cursor.execute("SELECT id, created_date, last_modified_date FROM meta_data_table WHERE table_name=?", (self._table, ))
        rows = cursor.fetchall()
        if len(rows) == 1:
            self._table_id = rows[0][0]

    def get_table_config(self):
        if self._table_id is None:
            self.get_table_id()
        cursor = self.db_conn.cursor()
        cursor.execute("SELECT column_name, column_order, column_label FROM meta_data_column WHERE table_id=? AND is_shown is true ORDER bY column_order", (self._table_id, ))
        rows = cursor.fetchall()
        self.header.clear()
        order = 0
        for (column_name, column_order, column_label) in rows:
            self.header[order] = { 'column': column_name, 'label': column_label, 'order': column_order}
            order += 1            
        # print(f"retrieved {len(rows)} columns, set {len(self.header)} headers")
        cursor.execute("SELECT column_name, filter_label from meta_data_column WHERE table_id=? AND show_filter is true", (self._table_id, ))
        rows = cursor.fetchall()
        for row in rows:
            self.filter[row[0]] = {'label': row[1], 'widget': None}
        # print(f"retrieved {len(rows)} filters: {self.filter}")

    def get_filter(self) -> str:
        filter_rule = ""
        # print(self.filter["download"].isChecked())
        for column, filter_info in self.filter.items():
            # print(column, filter_info)
            if filter_info['widget'].isChecked():
                # print(column, filter_info, filter_rule, len(filter_rule))
                if len(filter_rule) < 1:
                    filter_rule += "WHERE "
                if len(filter_rule) > 8:
                    filter_rule += " AND "
                filter_rule += f"{column} is true"
        # print(f"{filter_rule=}")
        return filter_rule

    def get_statement(self) -> str:
        filter_rule = self.get_filter()
        # self.get_table_config()
        columns = ""
        for index, column in self.header.items():
            if index > 0:
                columns += ", "
            columns += column['column']
        statement = f"SELECT {columns} FROM media_file {filter_rule}"
        return statement

    def get_filter_layout(self) -> QHBoxLayout:
        filter_layout = QHBoxLayout()
        for column, filter_info in self.filter.items():
            filter_checkbox = QCheckBox()
            filter_checkbox.setText(filter_info['label'])
            filter_checkbox.checkStateChanged.connect(self.main_window.refresh)
            self.filter[column]['widget'] = filter_checkbox
            filter_layout.addWidget(filter_checkbox)
        filter_layout.addStretch()
        return filter_layout