Reisacher-Forderung/app/query_filter.py

import csv
from dataclasses import dataclass, field
from urllib.parse import quote, unquote

EMPTY_FILTER_VALUE = "__empty__"
EMPTY_FILTER_LABEL = "Ohne Wert"


def decode_filter_values(value: str | None) -> list[str]:
    """Split the GET-decoded parameter before decoding individual values."""
    return list(dict.fromkeys(decoded for part in (value or "").split(",")
                              if (decoded := unquote(part).strip())))


def encode_filter_values(values) -> str:
    return ",".join(quote(value, safe="") for value in dict.fromkeys(
        str(value).strip() for value in values) if value)


def filter_clauses(config, params, exclude=None):
    clauses, values = [], {}
    for f in config:
        current = params.get(f.name, f.default_value)
        if f.name == exclude or f.filter_type == "hidden" or not current:
            continue
        parameter = f"filter_{f.name.lower()}"
        if f.filter_type == "date":
            operator = "<=" if "bis" in f.name.lower() else ">="
            clauses.append(f"F.[{f.key_column}] {operator} :{parameter}")
            values[parameter] = current
            continue
        parts = decode_filter_values(current)
        terms = []
        for index, part in enumerate(parts):
            key = parameter if len(parts) == 1 else f"{parameter}_{index}"
            if part == EMPTY_FILTER_VALUE:
                terms.append(f"NULLIF(F.[{f.key_column}], '') IS NULL")
                continue
            operator = "=" if f.filter_type == "select" else "LIKE"
            terms.append(f"F.[{f.key_column}] {operator} :{key}")
            values[key] = part if f.filter_type == "select" else f"%{part}%"
        if terms:
            clauses.append("(" + " OR ".join(terms) + ")")
    return clauses, values


@dataclass
class FilterConfig:
    name: str
    text: str
    filter_type: str
    width: str
    key_column: str
    value_column: str
    sort_column: str
    visible: bool = True
    default_value: str = ""
    options: dict[str, str] | None = field(default_factory=dict)
    current_value: str | None = None

    @property
    def selected_values(self) -> list[str]:
        return decode_filter_values(self.current_value)

    @property
    def selected_items(self) -> list[dict[str, str]]:
        options = {str(key): str(value) for key, value in (self.options or {}).items()}
        options[EMPTY_FILTER_VALUE] = EMPTY_FILTER_LABEL
        return [{"value": value, "label": options.get(value, value)} for value in self.selected_values]

    @property
    def query_param(self) -> str:
        if self.current_value is None or self.current_value == "":
            if self.default_value is None or self.default_value == "":
                return None
            self.current_value = self.default_value

        if self.filter_type == "date":
            if "bis" in self.name.lower():
                return f" F.[{self.key_column}] <= '{self.current_value}' "
            return f" F.[{self.key_column}] >= '{self.current_value}' "
        # if self.filter_type == "select":
        #     return f"{self.key_column} IN ({self.current_value})"
        return f" F.[{self.key_column}] LIKE '%{self.current_value}%' "

    @staticmethod
    def from_dict(
        name: str,
        filter_type: str,
        width: str,
        text: str,
        key_column: str,
        value_column: str,
        sort_column: str,
        default_value: str,
    ) -> "FilterConfig":
        if filter_type not in ["text", "select", "date", "hidden"]:
            filter_type = "text"
        if width not in ["1", "2", "3", "4"]:
            width = "2"
        if not text:
            text = name
        if not key_column:
            key_column = name
        if not value_column:
            value_column = key_column
        if not sort_column:
            sort_column = key_column
        if not default_value:
            default_value = ""

        return FilterConfig(
            name=name,
            text=text,
            filter_type=filter_type,
            width=width,
            key_column=key_column,
            value_column=value_column,
            sort_column=sort_column,
            default_value=default_value,
        )


filter_type_option = {
    "text": "text",
    "select": "selectedOptionValue",
    "date": "selectedDate",
    "hidden": "selectedOptionValue",
}


def import_filter_config(area: str) -> list[FilterConfig]:
    res = []
    with open(f"templates\\{area}\\liste\\config\\liste_filter.csv", "r", newline="", encoding="latin-1") as csvfile:
        reader = csv.DictReader(csvfile, delimiter=";")
        for row in reader:
            config = FilterConfig.from_dict(*row.values())

            res.append(config)
    return res