//
// Swiftfin is subject to the terms of the Mozilla Public
// License, v2.0. If a copy of the MPL was not distributed with this
// file, you can obtain one at https://mozilla.org/MPL/2.0/.
//
// Copyright (c) 2022 Jellyfin & Jellyfin Contributors
//

import Foundation
import SwiftUI

struct ParallaxHeaderScrollView<Header: View, StaticOverlayView: View, Content: View>: View {
    var header: Header
    var staticOverlayView: StaticOverlayView
    var overlayAlignment: Alignment
    var headerHeight: CGFloat
    var content: () -> Content

    init(
        header: Header,
        staticOverlayView: StaticOverlayView,
        overlayAlignment: Alignment = .center,
        headerHeight: CGFloat,
        content: @escaping () -> Content
    ) {
        self.header = header
        self.staticOverlayView = staticOverlayView
        self.overlayAlignment = overlayAlignment
        self.headerHeight = headerHeight
        self.content = content
    }

    var body: some View {
        ScrollView(showsIndicators: false) {
            GeometryReader { proxy in
                let yOffset = proxy.frame(in: .global).minY > 0 ? -proxy.frame(in: .global).minY : 0
                header
                    .frame(width: proxy.size.width, height: proxy.size.height - yOffset)
                    .overlay(staticOverlayView, alignment: overlayAlignment)
                    .offset(y: yOffset)
            }
            .frame(height: headerHeight)

            HStack {
                content()
                Spacer(minLength: 0)
            }
        }
    }
}