src/models.py

import math
from dataclasses import dataclass, field
from typing import List, Optional

@dataclass
class FluteProfile:
    name: str
    height_mm: float
    factor: float # Direct input now
    pitch_mm: float = 0.0 # Optional/Reference only now

    def __post_init__(self):
        pass # No calculation needed

@dataclass
class PaperGrade:
    code: str
    gsm: int
    rate: float
    rct_cd_N: float  # Ring Crush CD in Newtons (N)
    rct_md_N: float  # Ring Crush MD in Newtons (N)
    bursting_strength_kpa: float  # kPa
    ash_pct: float
    moisture_pct: float

@dataclass
class FactoryConfig:
    wastage_process_pct: float
    cost_conversion_per_kg: float
    cost_fixed_setup: float
    margin_pct: float
    process_efficiency_pct: float
    currency: str
    available_reel_sizes: List[int]
    # Value-Add Costs (optional processes)
    cost_printing_per_1000: float = 0.0
    cost_printing_plate: float = 0.0
    cost_uv_per_1000: float = 0.0
    cost_lamination_per_1000: float = 0.0
    cost_die_cutting_per_1000: float = 0.0
    cost_die_frame: float = 0.0
    ect_conversion_factor: float = 0.85

@dataclass
class LayerInput:
    layer_type: str  # "Liner" or "Flute"
    paper: PaperGrade
    flute_profile: Optional[FluteProfile] = None
    deckle_mm: Optional[int] = None # User provided reel size for this layer

@dataclass
class CartonSpecification:
    length_mm: float
    width_mm: float
    height_mm: float
    layers: List[LayerInput]
    ply_type: str # "3 Ply", "5 Ply", "2+1 (Bleach Card)"
    stitch_allowance_mm: float = 40.0
    # Process Flags
    has_printing: bool = False
    has_uv: bool = False
    has_lamination: bool = False
    has_die_cutting: bool = False