//
//  DropDownView.swift
//  AcaMate
//
//  Created by TAnine on 3/25/25.
//

import SwiftUI
class DropdownManager: ObservableObject {
    static let shared = DropdownManager()
    
    @Published var isPresented = false
    @Published var items: [String] = []
    @Published var anchor: CGRect = .zero
    var onSelect: ((String) -> Void)?
    
    func show(items: [String], anchor: CGRect, onSelect: @escaping (String) -> Void) {
        self.items = items
        self.anchor = anchor
        self.onSelect = onSelect
        isPresented = true
    }
    
    func dismiss() {
        isPresented = false
    }
}

struct DropdownButton: View {
    let title: String
    let items: [String]
    
    @State private var frame: CGRect = .zero
    
    var body: some View {
        Button {
            DropdownManager.shared.show(items: items, anchor: frame) { selected in
                print("선택한 항목:", selected)
            }
        } label: {
            HStack {
                Text(title)
                Image(systemName: "chevron.down")
            }
            .padding()
            .background(RoundedRectangle(cornerRadius: 8).stroke(Color.gray))
        }
        .background(
            GeometryReader { geo in
                Color.clear
                    .onAppear {
                        frame = geo.frame(in: .global)
                    }
            }
        )
    }
}


struct GlobalDropdownOverlay: View {
    @ObservedObject var manager = DropdownManager.shared
    
    var body: some View {
        if manager.isPresented {
            ZStack(alignment: .topLeading) {
                Color.black.opacity(0.001)
                    .ignoresSafeArea()
                    .onTapGesture {
                        manager.dismiss()
                    }
                
                VStack(alignment: .leading, spacing: 0) {
                    ForEach(manager.items, id: \.self) { item in
                        Button {
                            manager.onSelect?(item)
                            manager.dismiss()
                        } label: {
                            Text(item)
                                .padding()
                                .frame(maxWidth: .infinity, alignment: .leading)
                        }
                        .buttonStyle(.plain)
                        .background(Color.white)
                    }
                }
                .frame(width: manager.anchor.width)
                .background(RoundedRectangle(cornerRadius: 8).stroke(Color.gray))
                .shadow(radius: 5)
                .position(x: manager.anchor.midX, y: manager.anchor.maxY + 10)
            }
        }
    }
}