import SwiftUI

struct FeedItemCard: View {
    let item: FeedItem
    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
    
    var body: some View {
        Group {
            switch item.type {
            case .sermon(let sermon):
                SermonCard(sermon: sermon, style: .feed)
            case .event(let event):
                EventFeedCard(event: event)
            case .bulletin(let bulletin):
                BulletinFeedCard(bulletin: bulletin)
            case .verse(let verse):
                VerseFeedCard(verse: verse)
            }
        }
        .containerRelativeFrame(.horizontal) { width, _ in
            horizontalSizeClass == .regular ? min(width * 0.9, 600) : width * 0.95
        }
    }
}


// MARK: - Event Feed Card

struct EventFeedCard: View {
    let event: ChurchEvent
    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
    
    var body: some View {
        NavigationLink {
            EventDetailViewWrapper(event: event)
        } label: {
            HStack(spacing: 16) {
                // Date indicator
                VStack(spacing: 4) {
                    Text(event.dayOfMonth)
                        .font(.system(size: 18, weight: .bold))
                        .foregroundColor(Color(hex: "fb8b23"))
                    
                    Text(event.monthAbbreviation)
                        .font(.system(size: 10, weight: .semibold))
                        .foregroundColor(.secondary)
                        .textCase(.uppercase)
                }
                .frame(width: 50)
                .padding(.vertical, 8)
                .background(Color(hex: "fb8b23").opacity(Double(0.1)), in: RoundedRectangle(cornerRadius: 8))
                
                // Event content
                VStack(alignment: .leading, spacing: 8) {
                    Text(event.title)
                        .font(.system(size: 16, weight: .semibold))
                        .lineLimit(2)
                    
                    if !event.description.isEmpty {
                        Text(event.description.stripHtml())
                            .font(.system(size: 14))
                            .foregroundColor(.secondary)
                            .lineLimit(2)
                    }
                    
                    HStack(spacing: 8) {
                        Image(systemName: "clock.fill")
                            .font(.caption)
                            .foregroundColor(Color(hex: "fb8b23"))
                        
                        Text(event.timeString)
                            .font(.system(size: 13, weight: .medium))
                            .foregroundColor(.secondary)
                        
                        if !event.location.isEmpty {
                            Image(systemName: "location.fill")
                                .font(.caption)
                                .foregroundColor(Color(hex: "fb8b23"))
                            
                            Text(event.location)
                                .font(.system(size: 13, weight: .medium))
                                .foregroundColor(.secondary)
                                .lineLimit(1)
                        }
                    }
                }
                
                Spacer()
                
                // Event image (if available)
                if let imageUrl = event.thumbnail ?? event.image {
                    AsyncImage(url: URL(string: imageUrl)) { image in
                        image
                            .resizable()
                            .aspectRatio(contentMode: .fill)
                    } placeholder: {
                        RoundedRectangle(cornerRadius: 8)
                            .fill(.secondary.opacity(0.3))
                    }
                    .frame(width: 60, height: 60)
                    .clipShape(RoundedRectangle(cornerRadius: 8))
                }
            }
            .padding(16)
            .background(.regularMaterial, in: RoundedRectangle(cornerRadius: 16))
            .shadow(color: .black.opacity(0.1), radius: 8, x: 0, y: 4)
        }
        .buttonStyle(.plain)
    }
    
    private func dayFromDate(_ dateString: String) -> String {
        let formatter = ISO8601DateFormatter()
        if let date = formatter.date(from: dateString) {
            let dayFormatter = DateFormatter()
            dayFormatter.dateFormat = "d"
            return dayFormatter.string(from: date)
        }
        return "?"
    }
    
    private func monthFromDate(_ dateString: String) -> String {
        let formatter = ISO8601DateFormatter()
        if let date = formatter.date(from: dateString) {
            let monthFormatter = DateFormatter()
            monthFormatter.dateFormat = "MMM"
            return monthFormatter.string(from: date).uppercased()
        }
        return "???"
    }
}

// MARK: - Bulletin Feed Card

struct BulletinFeedCard: View {
    let bulletin: ChurchBulletin
    
    var body: some View {
        NavigationLink {
            BulletinDetailView(bulletin: bulletin)
        } label: {
            HStack(spacing: 16) {
                // PDF icon
                Image(systemName: "doc.text.fill")
                    .font(.system(size: 32))
                    .foregroundStyle(Color(hex: "fb8b23"))
                    .frame(width: 50)
                
                // Bulletin content
                VStack(alignment: .leading, spacing: 8) {
                    Text(bulletin.title)
                        .font(.headline)
                        .fontWeight(.semibold)
                        .lineLimit(2)
                        .multilineTextAlignment(.leading)
                    
                    Text(bulletin.formattedDate)
                        .font(.subheadline)
                        .foregroundStyle(.secondary)
                    
                    Label("Church Bulletin", systemImage: "newspaper.fill")
                        .font(.caption)
                        .padding(.horizontal, 8)
                        .padding(.vertical, 4)
                        .background(.green.opacity(0.1), in: Capsule())
                        .foregroundStyle(.green)
                }
                
                Spacer()
                
                Image(systemName: "chevron.right")
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
            .padding(16)
            .background(.regularMaterial, in: RoundedRectangle(cornerRadius: 16))
            .shadow(color: .black.opacity(0.1), radius: 8, x: 0, y: 4)
        }
        .buttonStyle(.plain)
    }
}

// MARK: - Bible Verse Feed Card

struct VerseFeedCard: View {
    let verse: BibleVerse
    
    var body: some View {
        VStack(alignment: .leading, spacing: 16) {
            HStack {
                Image(systemName: "book.fill")
                    .foregroundStyle(Color(hex: "fb8b23"))
                
                Text("Verse of the Day")
                    .font(.caption)
                    .fontWeight(.medium)
                    .foregroundStyle(.secondary)
                
                Spacer()
            }
            
            Text("\"\(verse.text)\"")
                .font(.body)
                .fontWeight(.medium)
                .italic()
                .lineLimit(4)
                .multilineTextAlignment(.leading)
            
            HStack {
                Text(verse.reference)
                    .font(.caption)
                    .fontWeight(.semibold)
                    .foregroundStyle(Color(hex: "fb8b23"))
                
                if let version = verse.version {
                    Text(version)
                        .font(.caption)
                        .foregroundStyle(.secondary)
                }
                
                Spacer()
                
                Button {
                    // Share verse
                } label: {
                    Image(systemName: "square.and.arrow.up")
                        .font(.caption)
                        .foregroundStyle(.secondary)
                }
            }
        }
        .padding(16)
        .background(
            LinearGradient(
                colors: [Color(hex: "fb8b23").opacity(0.1), Color(hex: "fb8b23").opacity(0.05)],
                startPoint: .topLeading,
                endPoint: .bottomTrailing
            ),
            in: RoundedRectangle(cornerRadius: 16)
        )
        .overlay(
            RoundedRectangle(cornerRadius: 16)
                .stroke(Color(hex: "fb8b23").opacity(0.2), lineWidth: 1)
        )
    }
}

// MARK: - Color Extension

extension Color {
    init(hex: String) {
        let hex = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int: UInt64 = 0
        Scanner(string: hex).scanHexInt64(&int)
        let a, r, g, b: UInt64
        switch hex.count {
        case 3: // RGB (12-bit)
            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: // RGB (24-bit)
            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
        case 8: // ARGB (32-bit)
            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
        default:
            (a, r, g, b) = (1, 1, 1, 0)
        }

        self.init(
            .sRGB,
            red: Double(r) / 255,
            green: Double(g) / 255,
            blue:  Double(b) / 255,
            opacity: Double(a) / 255
        )
    }
}

#Preview {
    VStack(spacing: 20) {
        FeedItemCard(item: FeedItem(
            type: .sermon(Sermon.sampleSermon()),
            timestamp: Date()
        ))
        
        FeedItemCard(item: FeedItem(
            type: .event(ChurchEvent.sampleEvent()),
            timestamp: Date()
        ))
    }
    .padding()
}