//
//  PlaceholderController.swift
//  ComposeUI
//
//  Created by Shadowfacts on 3/6/23.
//

import SwiftUI

final class PlaceholderController: ViewController, PlaceholderViewProvider {
    
    private let placeholderView: PlaceholderView = PlaceholderController.makePlaceholderView()
        
    static func makePlaceholderView() -> some View {
        let components = Calendar.current.dateComponents([.month, .day], from: Date())
        if components.month == 3 && components.day == 14,
           Date().formatted(date: .numeric, time: .omitted).starts(with: "3") {
            Text("Happy π day!")
        } else if components.month == 4 && components.day == 1 {
            Text("April Fool's!").rotationEffect(.radians(.pi), anchor: .center)
        } else if components.month == 9 && components.day == 5 {
            // https://weirder.earth/@noracodes/109276419847254552
            // https://retrocomputing.stackexchange.com/questions/14763/what-warning-was-given-on-attempting-to-post-to-usenet-circa-1990
            Text("This program posts news to thousands of machines throughout the entire populated world. Please be sure you know what you are doing.").italic()
        } else if components.month == 9 && components.day == 21 {
            Text("Do you remember?")
        } else if components.month == 10 && components.day == 31 {
            if .random() {
                Text("Post something spooky!")
            } else {
                Text("Any questions?")
            }
        } else {
            Text("What's on your mind?")
        }
    }
    
    var view: some View {
        placeholderView
    }
}

// exists to provide access to the type alias since the @State property needs it to be explicit
private protocol PlaceholderViewProvider {
    associatedtype PlaceholderView: View
    @ViewBuilder
    static func makePlaceholderView() -> PlaceholderView
}