//
//  MinimedReservoirView.swift
//  MinimedKitUI
//
//  Created by Pete Schwamb on 11/30/22.
//  Copyright © 2022 LoopKit Authors. All rights reserved.
//

import SwiftUI

struct MinimedReservoirView: View {

    let filledPercent: Double
    let fillColor: Color

    // mask height to reservoir height ratio
    let maskHeightRatio = 0.887

    let reservoirAspectRatio = 28.0 / 44.0

    func reservoirSize(in frame: CGSize) -> CGSize {
        let frameAspectRatio = frame.width / frame.height
        if frameAspectRatio > reservoirAspectRatio {
            return CGSize(
                width: frame.height * reservoirAspectRatio,
                height: frame.height)
        } else {
            return CGSize(
                width: frame.width,
                height: frame.width / reservoirAspectRatio)
        }
    }

    var body: some View {
        ZStack(alignment: Alignment(horizontal: .center, vertical: .center)) {
            GeometryReader { geometry in
                let reservoirSize = reservoirSize(in: geometry.size)
                let frameCenterX = geometry.size.width / 2
                let frameCenterY = geometry.size.height / 2
                let maskHeight = reservoirSize.height * maskHeightRatio
                let fillHeight = maskHeight * filledPercent
                let maskOffset = (reservoirSize.height - maskHeight) / 2

                Rectangle()
                    .fill(fillColor)
                    .mask(
                        Image("reservoir_mask")
                            .resizable()
                            .scaledToFit()
                            .frame(height: maskHeight)
                            .position(x:frameCenterX, y:frameCenterY+maskOffset)
                    )
                    .mask(
                        Rectangle().path(in: CGRect(x:0, y: frameCenterY+maskHeight/2 - fillHeight + maskOffset, width: geometry.size.width, height: fillHeight))
                    )
            }
            Image("reservoir")
                .resizable()
                .scaledToFit()
        }
    }
}