#!/usr/bin/env python3

from pathlib import Path
from datetime import date, timedelta, datetime
from fints.client import FinTS3PinTanClient
import csv
import json
from urllib.request import urlopen

# --------------------------------------------------
# Konfiguration laden
# --------------------------------------------------

config = {}

# Zuerst Home-Verzeichnis prüfen
config_file = Path.home() / ".ing.conf"

# Falls nicht vorhanden, Datei neben dem Skript verwenden
if not config_file.exists():
    config_file = Path(__file__).parent / ".ing.conf"

with open(config_file, encoding="utf-8") as f:
    for line in f:
        line = line.strip()

        if not line or line.startswith("#"):
            continue

        if "=" not in line:
            continue

        key, value = line.split("=", 1)
        config[key] = value

# --------------------------------------------------
# ING-Konfiguration
# --------------------------------------------------

USER = config["ING_USER"]
PIN = config["ING_PIN"]
TARGET_IBAN = config["ING_IBAN"]
IOBROKER_HOST = config["IOBROKER_HOST"]
IOBROKER_PORT = config["IOBROKER_PORT"]
IOBROKER_DP_TRANSACTIONS = config["IOBROKER_DP_TRANSACTIONS"]

BLZ = "50010517"

# --------------------------------------------------
# Exportverzeichnis bestimmen
# --------------------------------------------------

base_dir = Path.home() / "Transaktionen"

if not base_dir.exists():
    base_dir = Path(__file__).parent / "Transaktionen"

# Kalenderwoche bestimmen
year, week, _ = datetime.now().isocalendar()

year_dir = base_dir / str(year)
csv_dir = year_dir / "csv"
json_dir = year_dir / "json"

# Verzeichnisse anlegen
csv_dir.mkdir(parents=True, exist_ok=True)
json_dir.mkdir(parents=True, exist_ok=True)

CSV_FILE = csv_dir / f"transactions_{year}_KW{week:02d}.csv"
JSON_FILE = json_dir / f"transactions_{year}_KW{week:02d}.json"
# --------------------------------------------------
# ING-Verbindung
# --------------------------------------------------

client = FinTS3PinTanClient(
    BLZ,
    USER,
    PIN,
    "https://fints.ing.de/fints/",
    product_id="PythonFinTS"
)

export_data = []

# --------------------------------------------------
# Transaktionen abrufen
# --------------------------------------------------

with client:
    account_found = False

    for account in client.get_sepa_accounts():

        if account.iban != TARGET_IBAN:
            continue

        account_found = True

        transactions = client.get_transactions(
            account,
            start_date=date.today() - timedelta(days=7),
            end_date=date.today()
        )

        for transaction in transactions:

            data = transaction.data

            row = {
                "date": str(data.get("date", "")),
                "amount": str(data.get("amount", "")),
                "posting_text": data.get("posting_text", ""),
                "applicant_name": data.get("applicant_name", ""),
                "purpose": data.get("purpose", "")
            }

            export_data.append(row)

        break

    if not account_found:
        raise RuntimeError(
            f"IBAN nicht gefunden: {TARGET_IBAN}"
        )

# --------------------------------------------------
# CSV schreiben
# --------------------------------------------------

with open(CSV_FILE, "w", newline="", encoding="utf-8") as csvfile:

    writer = csv.DictWriter(
        csvfile,
        fieldnames=[
            "date",
            "amount",
            "posting_text",
            "applicant_name",
            "purpose"
        ],
        delimiter=";"
    )

    writer.writeheader()
    writer.writerows(export_data)

# --------------------------------------------------
# JSON schreiben
# --------------------------------------------------

with open(JSON_FILE, "w", encoding="utf-8") as jsonfile:

    json.dump(
        export_data,
        jsonfile,
        ensure_ascii=False,
        indent=2
    )


# --------------------------------------------------
# Statistiken berechnen
# --------------------------------------------------

transaction_count = len(export_data)

week_sum = 0.0
week_expenses = 0.0

for transaction in transactions:
    amount = float(transaction.data["amount"].amount)

    week_sum += amount

    if amount < 0:
        week_expenses += abs(amount)

# --------------------------------------------------
# An ioBroker senden
# --------------------------------------------------

base_url = f"http://{IOBROKER_HOST}:{IOBROKER_PORT}/set"

urlopen(
    f"{base_url}/javascript.0.Variablen.Konto_Transaktionen"
    f"?value={transaction_count}"
).read()

urlopen(
    f"{base_url}/javascript.0.Variablen.Konto_Wochensumme"
    f"?value={round(week_sum, 2)}"
).read()

urlopen(
    f"{base_url}/javascript.0.Variablen.Konto_Wochenausgaben"
    f"?value={round(week_expenses, 2)}"
).read()

# --------------------------------------------------
# Erfolgsmeldung
# --------------------------------------------------

transaction_count = len(export_data)

url = (
    f"http://{IOBROKER_HOST}:{IOBROKER_PORT}"
    f"/set/{IOBROKER_DP_TRANSACTIONS}"
    f"?value={transaction_count}"
)

urlopen(url).read()