import SwiftUI
import SwiftData

@main
struct ExpirannerApp: App {
    private let container: ModelContainer

    init() {
        let schema = Schema([Store.self, ProductRecord.self])
        do {
            container = try ModelContainer(for: schema)
        } catch {
            // 이전 버전 저장소와 호환되지 않으면 저장소를 초기화하고 다시 시도한다.
            print("저장소 열기 실패, 데이터를 재설정합니다: \(error)")
            Self.removeDefaultStoreFiles()
            do {
                container = try ModelContainer(for: schema)
            } catch {
                fatalError("SwiftData 저장소를 만들 수 없습니다: \(error)")
            }
        }
    }

    private static func removeDefaultStoreFiles() {
        let dir = URL.applicationSupportDirectory
        for name in ["default.store", "default.store-shm", "default.store-wal"] {
            try? FileManager.default.removeItem(at: dir.appending(path: name))
        }
    }

    var body: some Scene {
        WindowGroup {
            RootView()
                .tint(Theme.accent)
        }
        .modelContainer(container)
    }
}

/// 시스템 런치 스크린에서 자연스럽게 이어지는 인앱 스플래시.
private struct RootView: View {
    @AppStorage(appearanceStorageKey) private var appearanceRaw = AppearanceMode.dark.rawValue
    @State private var showSplash = true

    var body: some View {
        ZStack {
            StoreListView()
            if showSplash {
                SplashView()
                    .transition(.opacity)
                    .zIndex(1)
            }
        }
        .preferredColorScheme(AppearanceMode(rawValue: appearanceRaw)?.colorScheme)
        .task {
            try? await Task.sleep(for: .seconds(1.0))
            withAnimation(.easeOut(duration: 0.4)) {
                showSplash = false
            }
        }
    }
}

private struct SplashView: View {
    @State private var appeared = false

    var body: some View {
        ZStack {
            Theme.bg.ignoresSafeArea()
            VStack(spacing: 18) {
                Image("LaunchIcon")
                    .resizable()
                    .scaledToFit()
                    .frame(width: 110, height: 110)
                    .scaleEffect(appeared ? 1 : 0.9)
                    .shadow(color: Theme.accent.opacity(0.25), radius: 30)
                VStack(spacing: 6) {
                    Text("Expiranner")
                        .font(.system(size: 26, weight: .bold, design: .rounded))
                        .foregroundStyle(Theme.textPrimary)
                    Text("유통기한 점검")
                        .font(.footnote.weight(.semibold))
                        .foregroundStyle(Theme.accent)
                        .kerning(1)
                }
                .opacity(appeared ? 1 : 0)
                .offset(y: appeared ? 0 : 8)
            }
        }
        .onAppear {
            withAnimation(.spring(duration: 0.6)) {
                appeared = true
            }
        }
    }
}