"""Job cost and time estimation from STL geometry."""
import os

# g/cm³ per material — used to convert volume → weight
_DENSITY: dict[str, float] = {
    "PLA":   1.24,
    "PETG":  1.27,
    "ABS":   1.04,
    "ASA":   1.07,
    "TPU":   1.20,
    "Nylon": 1.14,
    "PC":    1.20,
}
_DEFAULT_DENSITY = 1.24

# Conservative average FDM print speed for weight-based time estimate
_PRINT_SPEED_G_PER_HOUR = 20.0


def estimate(volume_ccm: float, material: str | None) -> dict:
    """
    Returns a cost/time estimate dict for one job.

    Assumptions:
      - 20 % infill  →  material used = volume * 0.20
      - filament density from _DENSITY (default 1.24 g/cm³)
      - print speed: 20 g/h (conservative FDM average)
      - filament cost: FILAMENT_PRICE_PER_KG EUR / kg  (env, default 15)
      - misprint buffer: +20 %
      - gross profit margin: +30 %
      - VAT: VAT_RATE %  (env, default 19)
    """
    vat_rate      = float(os.environ.get("VAT_RATE", 19))
    price_per_kg  = float(os.environ.get("FILAMENT_PRICE_PER_KG", 15))
    density       = _DENSITY.get(material or "", _DEFAULT_DENSITY)

    material_ccm  = volume_ccm * 0.20
    weight_g      = material_ccm * density
    print_minutes = round((weight_g / _PRINT_SPEED_G_PER_HOUR) * 60)

    filament_cost = weight_g / 1000 * price_per_kg
    after_misprint = filament_cost * 1.20
    net_price     = after_misprint * 1.30
    gross_price   = net_price * (1 + vat_rate / 100)

    return {
        "material_ccm":    round(material_ccm, 2),
        "weight_g":        round(weight_g, 1),
        "print_minutes":   print_minutes,
        "filament_cost":   round(filament_cost, 2),
        "net_price":       round(net_price, 2),
        "gross_price":     round(gross_price, 2),
        "vat_rate":        vat_rate,
        "price_per_kg":    price_per_kg,
    }