"""Shared utilities for Occasion Scanner."""

from __future__ import annotations

import os
from pathlib import Path


PROJECT_ROOT = Path(__file__).resolve().parents[1]
DATA_DIR = PROJECT_ROOT / "data"
RAW_DATA_DIR = DATA_DIR / "raw"
PROCESSED_DATA_DIR = DATA_DIR / "processed"
SAMPLE_DATA_DIR = DATA_DIR / "samples"
MODELS_DIR = PROJECT_ROOT / "models"
REPORTS_DIR = PROJECT_ROOT / "reports"
FIGURES_DIR = REPORTS_DIR / "figures"
SCREENSHOTS_DIR = REPORTS_DIR / "screenshots"
EUR_TO_CHF_RATE = float(os.getenv("EUR_TO_CHF_RATE", "0.95"))
SWISS_MARKET_FACTOR = float(os.getenv("SWISS_MARKET_FACTOR", "1.08"))


def ensure_project_directories() -> None:
    """Create the standard project directories if they do not exist."""
    for path in [
        RAW_DATA_DIR,
        PROCESSED_DATA_DIR,
        SAMPLE_DATA_DIR,
        MODELS_DIR,
        MODELS_DIR / "damage_model",
        REPORTS_DIR,
        FIGURES_DIR,
        SCREENSHOTS_DIR,
    ]:
        path.mkdir(parents=True, exist_ok=True)


def format_eur(value: float | int | None) -> str:
    """Format a numeric value as an EUR amount for app output."""
    if value is None:
        return "n/a"
    return f"EUR {float(value):,.0f}".replace(",", "'")


def eur_to_chf(value: float | int | None) -> float | None:
    """Convert an internal EUR model amount to Swiss-market-calibrated CHF."""
    if value is None:
        return None
    return round(float(value) * EUR_TO_CHF_RATE * SWISS_MARKET_FACTOR, 2)


def format_chf(value: float | int | None) -> str:
    """Format an internal EUR model amount as calibrated CHF for app output."""
    chf_value = eur_to_chf(value)
    if chf_value is None:
        return "n/a"
    return f"CHF {chf_value:,.0f}".replace(",", "'")