//
//  NewCharacterListView.swift
//  SodaLive
//
//  Created by klaus on 9/12/25.
//

import SwiftUI

struct NewCharacterListView: View {
    @StateObject private var viewModel = NewCharacterListViewModel()
    
    private let horizontalPadding: CGFloat = 12
    private let gridSpacing: CGFloat = 12
    
    var body: some View {
        NavigationStack {
            BaseView(isLoading: $viewModel.isLoading) {
                VStack(spacing: 8) {
                    // Toolbar
                    DetailNavigationBar(title: "신규 캐릭터 전체보기")
                    
                    VStack(alignment: .leading, spacing: 12) {
                        // 전체 n개
                        HStack(spacing: 0) {
                            Text("전체 ")
                                .font(.custom(Font.preRegular.rawValue, size: 12))
                                .foregroundColor(Color(hex: "e2e2e2"))
                            Text("\(viewModel.totalCount)")
                                .font(.custom(Font.preRegular.rawValue, size: 12))
                                .foregroundColor(Color(hex: "ff5c49"))
                            Text("개")
                                .font(.custom(Font.preRegular.rawValue, size: 12))
                                .foregroundColor(Color(hex: "e2e2e2"))
                            Spacer()
                        }
                        .padding(.horizontal, 24)
                        
                        // Grid 3열
                        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]
                                        
                                        NavigationLink(value: item.characterId) {
                                            CharacterItemView(
                                                character: item,
                                                size: width,
                                                rank: 0,
                                                isShowRank: false
                                            )
                                            .onAppear { viewModel.loadMoreIfNeeded(currentIndex: idx) }
                                        }
                                    }
                                }
                                .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()
                        }
                    }
                }
                .background(Color.black)
            }
            .popup(isPresented: $viewModel.isShowPopup, type: .toast, position: .top, autohideIn: 2) {
                GeometryReader { geo in
                    HStack {
                        Spacer()
                        Text(viewModel.errorMessage)
                            .padding(.vertical, 13.3)
                            .frame(width: geo.size.width - 66.7, alignment: .center)
                            .font(.custom(Font.medium.rawValue, size: 12))
                            .background(Color.button)
                            .foregroundColor(Color.white)
                            .multilineTextAlignment(.center)
                            .cornerRadius(20)
                            .padding(.top, 66.7)
                        Spacer()
                    }
                }
            }
            .navigationDestination(for: Int.self) { characterId in
                CharacterDetailView(characterId: characterId)
            }
        }
    }
}

#Preview {
    NewCharacterListView()
        .background(Color.black)
}