import SwiftUI

struct MainHomeFollowingNewsSection: View {
    let recentNews: [FollowingNewsResponse]
    let onTapCreator: (Int) -> Void
    let onTapContent: (Int) -> Void

    init(
        recentNews: [FollowingNewsResponse],
        onTapCreator: @escaping (Int) -> Void = { _ in },
        onTapContent: @escaping (Int) -> Void = { _ in }
    ) {
        self.recentNews = recentNews
        self.onTapCreator = onTapCreator
        self.onTapContent = onTapContent
    }

    var body: some View {
        if !recentNews.isEmpty {
            VStack(alignment: .leading, spacing: SodaSpacing.s14) {
                SectionTitle(title: I18n.HomeFollowing.recentNewsTitle)

                VStack(alignment: .leading, spacing: SodaSpacing.s8) {
                    ForEach(recentNews) { news in
                        newsItemView(news)
                    }
                }
                .padding(.horizontal, SodaSpacing.s14)
            }
        }
    }

    @ViewBuilder
    private func newsItemView(_ news: FollowingNewsResponse) -> some View {
        switch news.type {
        case .creatorRanking:
            if let creatorRanking = news.creatorRanking {
                MainHomeFollowingRankingNewsCard(
                    creatorRanking: creatorRanking,
                    onTapCreator: onTapCreator
                )
            }

        case .contentRanking:
            if let contentRanking = news.contentRanking {
                MainHomeFollowingRankingNewsCard(
                    contentRanking: contentRanking,
                    onTapContent: onTapContent
                )
            }

        case .communityPost:
            if let communityPost = news.communityPost {
                CommunityPostCard(
                    postId: communityPost.postId,
                    creatorNickname: communityPost.creatorNickname,
                    creatorProfileImageUrl: communityPost.creatorProfileImage,
                    content: communityPost.content,
                    imageUrl: communityPost.imageUrl,
                    audioUrl: nil,
                    price: 0,
                    existOrdered: true,
                    createdAt: communityPost.relativeCreatedAtText(),
                    isLike: false,
                    likeCount: communityPost.likeCount,
                    commentCount: communityPost.commentCount
                )
            }

        case .audioContent:
            if let audioContent = news.audioContent {
                MainHomeFollowingContentNewsCard(
                    content: audioContent,
                    visibleFromAtUtc: news.visibleFromAtUtc,
                    variant: .audio,
                    onTapContent: onTapContent
                )
            }

        case .photoContent:
            if let photoContent = news.photoContent {
                MainHomeFollowingContentNewsCard(
                    content: photoContent,
                    visibleFromAtUtc: news.visibleFromAtUtc,
                    variant: .photo,
                    onTapContent: onTapContent
                )
            }

        case .unknown:
            EmptyView()
        }
    }
}

private extension FollowingCommunityPostNewsResponse {
    func relativeCreatedAtText(now: Date = Date()) -> String {
        DateParser.relativeTimeText(fromUTC: createdAt, fallback: createdAt, now: now)
    }
}

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

    static var previews: some View {
        ScrollView(.vertical) {
            MainHomeFollowingNewsSection(
                recentNews: [
                    FollowingNewsResponse(
                        newsId: "creator-ranking",
                        type: .creatorRanking,
                        visibleFromAtUtc: "2026-07-01T00:00:00Z",
                        creatorRanking: FollowingCreatorRankingNewsResponse(
                            rank: 2,
                            creatorId: 1,
                            nickname: "크리에이터",
                            profileImageUrl: previewImageUrl
                        ),
                        audioContent: nil,
                        photoContent: nil,
                        contentRanking: nil,
                        communityPost: nil
                    ),
                    FollowingNewsResponse(
                        newsId: "community-post",
                        type: .communityPost,
                        visibleFromAtUtc: "2026-07-01T00:00:00Z",
                        creatorRanking: nil,
                        audioContent: nil,
                        photoContent: nil,
                        contentRanking: nil,
                        communityPost: FollowingCommunityPostNewsResponse(
                            postId: 10,
                            creatorProfileImage: previewImageUrl,
                            creatorNickname: "크리에이터",
                            imageUrl: previewImageUrl,
                            content: "팔로잉 크리에이터의 커뮤니티 게시글입니다.",
                            createdAt: "2026-07-01T00:00:00Z",
                            likeCount: 5,
                            commentCount: 2
                        )
                    ),
                    FollowingNewsResponse(
                        newsId: "audio-content",
                        type: .audioContent,
                        visibleFromAtUtc: "2026-07-01T00:02:00Z",
                        creatorRanking: nil,
                        audioContent: FollowingContentNewsResponse(
                            contentId: 20,
                            contentImageUrl: previewImageUrl,
                            title: "오디오 콘텐츠 이름",
                            creatorProfileImageUrl: previewImageUrl,
                            creatorNickname: "크리에이터이름"
                        ),
                        photoContent: nil,
                        contentRanking: nil,
                        communityPost: nil
                    ),
                    FollowingNewsResponse(
                        newsId: "photo-content",
                        type: .photoContent,
                        visibleFromAtUtc: "2026-07-01T00:03:00Z",
                        creatorRanking: nil,
                        audioContent: nil,
                        photoContent: FollowingContentNewsResponse(
                            contentId: 21,
                            contentImageUrl: previewImageUrl,
                            title: "화보 콘텐츠 이름",
                            creatorProfileImageUrl: previewImageUrl,
                            creatorNickname: "크리에이터이름"
                        ),
                        contentRanking: nil,
                        communityPost: nil
                    )
                ]
            )
            .padding(.vertical, SodaSpacing.s20)
            .background(Color.black)
            .previewLayout(.sizeThatFits)
        }
    }
}