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//
// BOMController.swift
// ShedCalc
//
// Created by Jacky Jack on 01/08/2026.
//
import SwiftUI
import Combine
private func roundUpPieces(_ value: Float) -> Int {
Int(value.rounded(.up))
}
private func roundUpPieces(_ value: Double) -> Int {
Int(value.rounded(.up))
}
struct MaterialItem: Identifiable {
let materialName: String
let pricePerMeter: Double
let totalMeters: Double
let totalPrice: Double
let metersPerPiece: Double
let totalPieces: Double
let id = UUID()
}
class BOMController {
func calcBOM(from paramModel: ParamModel) -> [MaterialItem] {
var items: [MaterialItem] = []
items.append(calcOSB(from: paramModel))
items.append(calcWallTimber2x4(from: paramModel))
items.append(calcFloorTimber2x4(from: paramModel))
items.append(calcRoofTimber2x4(from: paramModel))
items.append(calcRoofFelt(from: paramModel))
items.append(calcWeatherWrap(from: paramModel))
items.append(calcCladding(from: paramModel))
return items
}
private func calcOSB(from paramModel: ParamModel) -> MaterialItem {
let totalOSBarea = paramModel.floorArea()
let OSBPrice = totalOSBarea*paramModel.OSBSheetPrice
let OSBPricePerMeter = paramModel.OSBSheetPrice / (1.2*2.4)
let totalPieces = roundUpPieces(totalOSBarea / (1.2*2.4))
return MaterialItem(
materialName: "OSB",
pricePerMeter: Double(OSBPricePerMeter),
totalMeters: Double(totalOSBarea),
totalPrice: Double(totalPieces)*Double(paramModel.OSBSheetPrice),
metersPerPiece:Double(paramModel.OSBSheetPrice),
totalPieces: Double(totalPieces))
}
private func calcWallTimber2x4(from paramModel: ParamModel) -> MaterialItem {
let totalLength = paramModel.totalWallBeamLength()
let timberBeamPrice = paramModel.timberBeamPrice
let totalPrice = totalLength*timberBeamPrice
let pieceSize = paramModel.timberLengthSize
let totalPieces = roundUpPieces(totalLength/pieceSize)
return MaterialItem(
materialName: "2x4",
pricePerMeter: Double(timberBeamPrice),
totalMeters: Double(totalLength),
totalPrice: Double(totalPrice),
metersPerPiece:Double(pieceSize),
totalPieces: Double(totalPieces)
)
}
private func calcFloorTimber2x4(from paramModel: ParamModel) -> MaterialItem {
let joistLength = paramModel.totalJoistBeamLength() * 2
let spacersLength = Double(paramModel.lengthBeamNum())*paramModel.beamSpace
let timberBeamPrice = paramModel.timberBeamPrice
let totalLength = Double(paramModel.lengthBeamNum())*paramModel.beamSpace
let totalPrice = totalLength*timberBeamPrice
let pieceSize = Double(paramModel.timberLengthSize)
let totalPieces = roundUpPieces(totalLength/pieceSize)
return MaterialItem(
materialName: "Floor 2x4",
pricePerMeter: Double(timberBeamPrice),
totalMeters: Double(totalLength),
totalPrice: Double(totalPrice),
metersPerPiece:Double(pieceSize),
totalPieces: Double(totalPieces)
)
}
private func calcRoofTimber2x4(from paramModel: ParamModel) -> MaterialItem {
let joistLength = paramModel.totalJoistBeamLength() * 2
let spacersLength = Double(paramModel.lengthBeamNum())*paramModel.beamSpace
let timberBeamPrice = paramModel.timberBeamPrice
let totalLength = Double(paramModel.lengthBeamNum())*paramModel.beamSpace
let totalPrice = totalLength*timberBeamPrice
let pieceSize = Double(paramModel.timberLengthSize)
let totalPieces = roundUpPieces(totalLength/pieceSize)
return MaterialItem(
materialName: "Roof 2x4",
pricePerMeter: Double(timberBeamPrice),
totalMeters: Double(totalLength),
totalPrice: Double(totalPrice),
metersPerPiece:Double(pieceSize),
totalPieces: Double(totalPieces)
)
}
private func calcRoofFelt(from paramModel: ParamModel) -> MaterialItem {
let roofArea = paramModel.roofArea()
let feltRollArea = Double(paramModel.feltWidth)*Double(paramModel.feltLength)
var feltPricePerMeter:Double = 0.0
if paramModel.feltPrice > 0.0 {
feltPricePerMeter = Double(paramModel.feltPrice) / feltRollArea
}
let totalPieces = roundUpPieces(Double(roofArea)/Double(feltRollArea))
let totalPrice = Double(totalPieces) * paramModel.feltPrice
return MaterialItem(
materialName: "Roof Felt",
pricePerMeter: Double(feltPricePerMeter),
totalMeters: Double(roofArea),
totalPrice: Double(totalPrice),
metersPerPiece:Double(feltRollArea),
totalPieces: Double(totalPieces)
)
}
private func calcWeatherWrap(from paramModel: ParamModel) -> MaterialItem {
return MaterialItem(
materialName: "Weather Wrap",
pricePerMeter: Double(0.1),
totalMeters: Double(0.1),
totalPrice: Double(0.1),
metersPerPiece:Double(0.1),
totalPieces: Double(0.1)
)
}
private func calcCladding(from paramModel: ParamModel) -> MaterialItem {
let wallArea = Double(paramModel.length*paramModel.height)*2 + Double(paramModel.width*paramModel.height)*2
let singleCladArea = paramModel.claddingLength * (Double(paramModel.claddingWidth) - paramModel.claddingOverlap)
let claddingPieces = wallArea/singleCladArea
let totalPieces = roundUpPieces(claddingPieces)
let totalPrice = Double(totalPieces) * paramModel.claddingPrice
return MaterialItem(
materialName: "Cladding",
pricePerMeter: Double(paramModel.claddingPrice),
totalMeters: Double(claddingPieces*paramModel.claddingLength),
totalPrice: Double(totalPrice),
metersPerPiece:Double(paramModel.claddingLength),
totalPieces: Double(totalPieces)
)
}
private func calcBeam(from paramModel: ParamModel) -> MaterialItem {
return MaterialItem(materialName: "2x4", pricePerMeter: 1.0, totalMeters: 10, totalPrice: 100, metersPerPiece: 1.2, totalPieces: 11.2)
}
}
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