import SwiftUI

struct MainHomeActiveCreatorSection: View {
    let items: [HomeActiveCreatorItem]
    let onTapLive: (Int) -> Void
    let onTapContent: (Int) -> Void
    let onTapCommunityPost: (Int) -> Void

    init(
        items: [HomeActiveCreatorItem],
        onTapLive: @escaping (Int) -> Void = { _ in },
        onTapContent: @escaping (Int) -> Void = { _ in },
        onTapCommunityPost: @escaping (Int) -> Void = { _ in }
    ) {
        self.items = items
        self.onTapLive = onTapLive
        self.onTapContent = onTapContent
        self.onTapCommunityPost = onTapCommunityPost
    }

    var body: some View {
        if !items.isEmpty {
            VStack(alignment: .leading, spacing: SodaSpacing.s14) {
                SectionTitle(title: I18n.HomeRecommendation.activeCreatorSectionTitle)

                ScrollView(.horizontal, showsIndicators: false) {
                    LazyHStack(alignment: .center, spacing: SodaSpacing.s8) {
                        ForEach(items, id: \.self) { item in
                            MainHomeActiveCreatorItemView(item: item) {
                                handleTap(item)
                            }
                        }
                    }
                    .padding(.horizontal, SodaSpacing.s14)
                }
            }
        }
    }

    private func handleTap(_ item: HomeActiveCreatorItem) {
        guard let targetId = item.targetId else { return }

        switch item.activityType {
        case .live:
            onTapLive(targetId)
        case .audio:
            onTapContent(targetId)
        case .community:
            onTapCommunityPost(targetId)
        case .unknown:
            break
        }
    }
}

private struct MainHomeActiveCreatorItemView: View {
    let item: HomeActiveCreatorItem
    let action: () -> Void

    var body: some View {
        Button(action: action) {
            HStack(alignment: .center, spacing: SodaSpacing.s8) {
                DownsampledKFImage(url: URL(string: item.creatorProfileImage), size: CGSize(width: 52, height: 52))
                    .background(Color.gray800)
                    .clipShape(Circle())
                    .frame(width: 52, height: 52)

                VStack(alignment: .leading, spacing: SodaSpacing.s6) {
                    Text(item.creatorNickname)
                        .appFont(.heading4)
                        .foregroundColor(.white)
                        .lineLimit(1)
                        .truncationMode(.tail)
                        .frame(width: 147, alignment: .leading)

                    HStack(alignment: .center, spacing: SodaSpacing.s8) {
                        if !item.activityType.title.isEmpty {
                            Text(item.activityType.title)
                                .appFont(.body5)
                                .foregroundColor(Color.gray100)
                                .padding(.horizontal, SodaSpacing.s4)
                                .padding(.vertical, 2)
                                .background(Color.gray700)
                                .clipShape(RoundedRectangle(cornerRadius: SodaSpacing.s4, style: .continuous))
                        }

                        Text(item.relativeActivityAtText())
                            .appFont(.body4)
                            .foregroundColor(Color.gray500)
                            .lineLimit(1)
                    }
                }
                .frame(width: 159, alignment: .leading)
            }
            .padding(SodaSpacing.s12)
            .background(Color.gray900)
            .clipShape(Capsule())
        }
        .buttonStyle(.plain)
    }
}

private extension HomeActiveCreatorItem {
    func relativeActivityAtText(now: Date = Date()) -> String {
        guard let activityDate = DateParser.parse(activityAt) else {
            return activityAt
        }

        let interval = max(0, now.timeIntervalSince(activityDate))
        let calendar = Calendar.current
        let yearMonth = calendar.dateComponents([.year, .month], from: activityDate, to: now)

        if let years = yearMonth.year, years >= 1 {
            return I18n.Time.yearsAgo(years)
        }

        if let months = yearMonth.month, months >= 1 {
            return I18n.Time.monthsAgo(months)
        }

        if interval < 60 {
            return I18n.Time.justNow
        }

        if interval < 3600 {
            return I18n.Time.minutesAgo(max(1, Int(interval / 60)))
        }

        if interval < 86_400 {
            return I18n.Time.hoursAgo(max(1, Int(interval / 3600)))
        }

        return I18n.Time.daysAgo(max(1, Int(interval / 86_400)))
    }
}

struct MainHomeActiveCreatorSection_Previews: PreviewProvider {
    private static let previewImageUrl = "https://picsum.photos/500/500"

    static var previews: some View {
        MainHomeActiveCreatorSection(
            items: [
                HomeActiveCreatorItem(
                    creatorNickname: "크리에이터이름",
                    creatorProfileImage: previewImageUrl,
                    activityType: .live,
                    activityAt: "2026-06-29T06:39:00Z",
                    targetId: 1
                ),
                HomeActiveCreatorItem(
                    creatorNickname: "크리에이터이름",
                    creatorProfileImage: previewImageUrl,
                    activityType: .audio,
                    activityAt: "2026-06-29T06:39:00Z",
                    targetId: 2
                )
            ]
        )
        .padding(.vertical, SodaSpacing.s20)
        .background(Color.black)
        .previewLayout(.sizeThatFits)
    }
}