"""Helpers shared by the nowcast alarm clients (geo and point)."""

from __future__ import annotations

import csv
import json
import os
import tempfile
from copy import deepcopy
from pathlib import Path
from typing import Any
from urllib.parse import urlsplit
from uuid import UUID

from common import ApiError, ConfigurationError, IklimClient


AUTHENTICATION_FIELDS = {
    "BASIC": ("username", "password"),
    "JWT_TOKEN": ("jwtToken",),
    "API_KEY": ("apiKey", "asQueryParameter", "asHeader"),
    "HMAC_SIGNATURE": ("clientId", "secret", "algorithm"),
}


def read_json_object(path: Path, description: str) -> dict[str, Any]:
    try:
        data = json.loads(path.read_text(encoding="utf-8"))
    except FileNotFoundError as exc:
        raise ConfigurationError(f"{description} dosyası bulunamadı: {path}") from exc
    except json.JSONDecodeError as exc:
        raise ConfigurationError(
            f"{description} geçerli JSON değil ({path}:{exc.lineno})."
        ) from exc
    if not isinstance(data, dict):
        raise ConfigurationError(f"{description} kök değeri JSON nesnesi olmalıdır.")
    return data


def required_config_value(data: dict[str, Any], key: str, location: str) -> Any:
    value = data.get(key)
    if value is None or (isinstance(value, str) and not value.strip()):
        raise ConfigurationError(f"{location}.{key} eksik veya boş.")
    if isinstance(value, str) and "change-me" in value.strip().lower():
        raise ConfigurationError(f"{location}.{key} placeholder değeri değiştirilmemiş.")
    return value


def load_webhook_config(path: Path) -> dict[str, Any]:
    config = read_json_object(path, "Webhook config")
    url = str(required_config_value(config, "url", "webhook"))
    parsed_url = urlsplit(url)
    if parsed_url.scheme != "https" or not parsed_url.netloc:
        raise ConfigurationError("webhook.url geçerli bir HTTPS adresi olmalıdır.")

    http_method = str(required_config_value(config, "httpMethod", "webhook")).upper()
    if http_method not in {"POST", "PUT", "GET"}:
        raise ConfigurationError("webhook.httpMethod POST, PUT veya GET olmalıdır.")

    authentication = config.get("authentication")
    if not isinstance(authentication, dict):
        raise ConfigurationError("webhook.authentication JSON nesnesi olmalıdır.")
    selected = str(
        required_config_value(authentication, "selected", "webhook.authentication")
    ).upper()
    if selected not in AUTHENTICATION_FIELDS:
        allowed = ", ".join(AUTHENTICATION_FIELDS)
        raise ConfigurationError(
            f"webhook.authentication.selected şu değerlerden biri olmalıdır: {allowed}."
        )
    options = authentication.get("options")
    if not isinstance(options, dict) or not isinstance(options.get(selected), dict):
        raise ConfigurationError(
            f"webhook.authentication.options.{selected} JSON nesnesi olmalıdır."
        )
    selected_options = options[selected]
    auth_payload: dict[str, Any] = {"type": selected}
    for field in AUTHENTICATION_FIELDS[selected]:
        auth_payload[field] = required_config_value(
            selected_options, field, f"webhook.authentication.options.{selected}"
        )

    payload: dict[str, Any] = {
        "url": url,
        "httpMethod": http_method,
        "contentType": str(
            required_config_value(config, "contentType", "webhook")
        ),
        "authentication": auth_payload,
    }
    for optional_field in ("requestHeaders", "deliveryPolicy"):
        if optional_field in config:
            if not isinstance(config[optional_field], dict):
                raise ConfigurationError(
                    f"webhook.{optional_field} JSON nesnesi olmalıdır."
                )
            payload[optional_field] = deepcopy(config[optional_field])
    return payload


def as_uuid(value: Any, *, version: int | None = None) -> str | None:
    if not isinstance(value, str):
        return None
    try:
        parsed = UUID(value)
    except ValueError:
        return None
    if version is not None and parsed.version != version:
        return None
    return value


def response_warnings(*objects: Any) -> list[str]:
    warnings: list[str] = []
    for data in objects:
        if not isinstance(data, dict):
            continue
        for key in ("warning", "warnings"):
            value = data.get(key)
            if isinstance(value, str) and value.strip():
                warnings.append(value.strip())
            elif isinstance(value, list):
                warnings.extend(str(item) for item in value if str(item).strip())
    return warnings


def write_csv_atomic(
    path: Path, rows: list[dict[str, Any]], fieldnames: list[str]
) -> None:
    """Rewrite a semicolon separated CSV through a temp file in the same directory."""
    temp_path: Path | None = None
    try:
        with tempfile.NamedTemporaryFile(
            "w",
            encoding="utf-8-sig",
            newline="",
            dir=path.parent,
            prefix=f".{path.name}.",
            suffix=".tmp",
            delete=False,
        ) as temp_file:
            temp_path = Path(temp_file.name)
            writer = csv.DictWriter(
                temp_file,
                fieldnames=fieldnames,
                delimiter=";",
                extrasaction="ignore",
            )
            writer.writeheader()
            writer.writerows(rows)
            temp_file.flush()
            os.fsync(temp_file.fileno())
        os.replace(temp_path, path)
    finally:
        if temp_path and temp_path.exists():
            temp_path.unlink()


def fetch_account_id(client: IklimClient) -> str:
    """Return the caller's account id from /v1/users/me."""
    response = client.request_json("GET", "/v1/users/me")
    data = response.data
    account = data.get("account") if isinstance(data, dict) else None
    account_id = account.get("id") if isinstance(account, dict) else None
    if not as_uuid(account_id):
        raise ApiError("/v1/users/me yanıtında geçerli account.id bulunamadı.")
    return account_id