//
//  OriginalTabView.swift
//  SodaLive
//
//  Created by klaus on 9/15/25.
//

import SwiftUI

struct OriginalTabView: View {
    
    @StateObject var viewModel = OriginalWorkViewModel()
    
    private let horizontalPadding: CGFloat = 12
    private let gridSpacing: CGFloat = 12
    
    var body: some View {
        BaseView(isLoading: $viewModel.isLoading) {
            GeometryReader { geo in
                let totalSpacing: CGFloat = gridSpacing * 2
                let width = (geo.size.width - (horizontalPadding * 2) - totalSpacing) / 3
                
                ScrollView(.vertical, showsIndicators: false) {
                    LazyVGrid(
                        columns: Array(
                            repeating: GridItem(
                                .flexible(),
                                spacing: gridSpacing,
                                alignment: .topLeading
                            ),
                            count: 3
                        ),
                        alignment: .leading,
                        spacing: gridSpacing
                    ) {
                        ForEach(viewModel.items.indices, id: \.self) { idx in
                            let item = viewModel.items[idx]
                            
                            OriginalTabItemView(
                                item: item,
                                size: width
                            )
                            .onAppear { viewModel.loadMoreIfNeeded(currentIndex: idx) }
                            .onTapGesture {
                                AppState.shared
                                    .setAppStep(step: .originalWorkDetail(originalId: item.id))
                            }
                        }
                    }
                    .padding(.horizontal, horizontalPadding)
                    
                    if viewModel.isLoadingMore {
                        HStack {
                            Spacer()
                            ProgressView()
                                .progressViewStyle(CircularProgressViewStyle(tint: .white))
                                .padding(.vertical, 16)
                            Spacer()
                        }
                    }
                }
            }
            .frame(minHeight: 0, maxHeight: .infinity)
            .padding(.vertical, 12)
            .onAppear {
                // 최초 1회만 로드하여 상세 진입 후 복귀 시 스크롤 위치가 유지되도록 함
                if viewModel.items.isEmpty {
                    viewModel.fetch()
                }
            }
        }
        .sodaToast(isPresented: $viewModel.isShowPopup, message: viewModel.errorMessage, autohideIn: 2)
    }
}

#Preview {
    OriginalTabView()
}