//
//  CharacterDetailGalleryView.swift
//  SodaLive
//
//  Created by klaus on 9/1/25.
//

import SwiftUI

struct CharacterDetailGalleryView: View {
    @StateObject var viewModel = CharacterDetailGalleryViewModel()
    
    private let columns = Array(repeating: GridItem(.flexible(), spacing: 0), count: 3)
    let characterId: Int
    
    // 계산된 속성들
    private var progressBarWidth: CGFloat {
        let maxWidth: CGFloat = screenSize().width - 48
        guard viewModel.totalCount > 0 else { return 0 }
        let percentage = Double(viewModel.ownedCount) / Double(viewModel.totalCount)
        return maxWidth * percentage
    }
    
    var body: some View {
        BaseView(isLoading: $viewModel.isLoading) {
            VStack(spacing: 24) {
                // 보유 정보 섹션
                collectionInfoView()
                    .padding(.horizontal, 24)
                
                // 갤러리 그리드
                ScrollView {
                    LazyVGrid(columns: columns, spacing: 0) {
                        ForEach(Array(viewModel.galleryItems.enumerated()), id: \.element.id) { index, item in
                            galleryImageView(item: item, index: index)
                                .onAppear {
                                    viewModel.loadMoreIfNeeded(currentItem: item)
                                }
                        }
                    }
                    .frame(width: screenSize().width)
                }
                
                Spacer()
            }
            .padding(.top, 24)
            .popup(isPresented: $viewModel.isShowPopup, type: .toast, position: .top, autohideIn: 2) {
                GeometryReader { geo in
                    HStack {
                        Spacer()
                        Text(viewModel.errorMessage)
                            .padding(.vertical, 13.3)
                            .frame(alignment: .center)
                            .frame(maxWidth: .infinity)
                            .padding(.horizontal, 33.3)
                            .font(.custom(Font.medium.rawValue, size: 12))
                            .background(Color.button)
                            .foregroundColor(Color.white)
                            .multilineTextAlignment(.center)
                            .cornerRadius(20)
                            .padding(.top, 66.7)
                        Spacer()
                    }
                }
            }
        }
        .onAppear {
            viewModel.characterId = characterId
            viewModel.loadInitialData()
        }
        .sheet(isPresented: $viewModel.isShowImageViewer) {
            ImageViewerView(
                images: viewModel.ownedImages.map { $0.imageUrl },
                selectedIndex: $viewModel.selectedImageIndex
            )
        }
        .overlay {
            if viewModel.isShowPurchaseDialog {
                SodaDialog(
                    title: "구매 확인",
                    desc: "선택한 이미지를 구매하시겠습니까?",
                    confirmButtonTitle: viewModel.selectedItemPrice,
                    confirmButtonAction: viewModel.onPurchaseConfirm,
                    cancelButtonTitle: "취소",
                    cancelButtonAction: viewModel.onPurchaseCancel
                )
            }
        }
    }
    
    @ViewBuilder
    private func collectionInfoView() -> some View {
        VStack(spacing: 8) {
            // 상단 정보 (계산된 % 보유중, 정보 아이콘, 개수)
            HStack {
                Text("\(viewModel.ownershipPercentage)% 보유중")
                    .font(.custom(Font.preBold.rawValue, size: 18))
                    .foregroundColor(.white)
                
                Spacer()
            
                HStack(spacing: 4) {
                    Text("\(viewModel.ownedCount)")
                        .font(.custom(Font.preRegular.rawValue, size: 16))
                        .foregroundColor(Color(hex: "#FDD453"))
                    
                    Text("/")
                        .font(.custom(Font.preRegular.rawValue, size: 16))
                        .foregroundColor(.white)
                    
                    Text("\(viewModel.totalCount)개")
                        .font(.custom(Font.preRegular.rawValue, size: 16))
                        .foregroundColor(.white)
                }
            }
            
            // 진행률 바
            GeometryReader { geometry in
                ZStack(alignment: .leading) {
                    // 배경 바
                    RoundedRectangle(cornerRadius: 999)
                        .foregroundColor(Color(hex: "#37474F"))
                        .frame(height: 9)
                    
                    // 진행률 바 (계산된 퍼센트)
                    RoundedRectangle(cornerRadius: 999)
                        .fill(
                            LinearGradient(
                                colors: [Color(hex: "#80D8FF"), Color(hex: "#6D5ED7")],
                                startPoint: .leading,
                                endPoint: .trailing
                            )
                        )
                        .frame(width: min(progressBarWidth, geometry.size.width), height: 9)
                }
            }
            .frame(height: 9)
        }
    }
    
    @ViewBuilder
    private func galleryImageView(item: CharacterImageListItemResponse, index: Int) -> some View {
        ZStack {
            // 이미지
            AsyncImage(url: URL(string: item.imageUrl)) { image in
                image
                    .resizable()
                    .aspectRatio(contentMode: .fill)
            } placeholder: {
                Rectangle()
                    .fill(Color.gray.opacity(0.3))
            }
            .frame(width: 132, height: 165)
            .clipped()
            .cornerRadius(0)
            
            // 미소유 이미지 오버레이
            if !item.isOwned {
                // 어두운 오버레이
                Rectangle()
                    .fill(Color.black.opacity(0.2))
                    .frame(width: 132, height: 165)
                
                // 자물쇠 아이콘과 코인 정보
                VStack(spacing: 8) {
                    // 자물쇠 아이콘
                    Image("ic_new_lock")
                        .resizable()
                        .scaledToFit()
                        .frame(width: 24)
                    
                    // 코인 정보 배경
                    HStack(spacing: 4) {
                        Image("ic_can")
                            .resizable()
                            .scaledToFit()
                            .frame(width: 16)
                        
                        Text("\(item.imagePriceCan)")
                            .font(.custom(Font.preBold.rawValue, size: 16))
                            .foregroundColor(Color(hex: "#263238"))
                    }
                    .padding(.horizontal, 12)
                    .padding(.vertical, 6)
                    .background(Color(hex: "#B5E7FA"))
                    .cornerRadius(30)
                    .overlay {
                        RoundedRectangle(cornerRadius: 30)
                            .strokeBorder(lineWidth: 1)
                            .foregroundColor(.button)
                    }
                }
            }
        }
        .onTapGesture {
            viewModel.onImageTapped(item, index: index)
        }
    }
}

#Preview {
    CharacterDetailGalleryView(characterId: 1)
}