//
//  SubscriptionStatusBar.swift
//  wake
//
//  Created by fairclip on 2025/8/19.
//

import SwiftUI

// MARK: - 订阅状态枚举
enum SubscriptionStatus {
    case free
    case pioneer(expiryDate: Date)
    
    var title: String {
        switch self {
        case .free:
            return ""
        case .pioneer:
            return "Pioneer"
        }
    }
    
    var backgroundColor: Color {
        switch self {
        case .free:
            return .clear
        case .pioneer:
            return .clear
        }
    }
    
    var textColor: Color {
        switch self {
        case .free:
            return Theme.Colors.textPrimary
        case .pioneer:
            return .themeTextMessageMain
        }
    }
    
    var backgroundImageName: String {
        switch self {
        case .free:
            return "Free"
        case .pioneer:
            return "Pioneer"
        }
    }
}

// MARK: - 订阅状态栏组件
struct SubscriptionStatusBar: View {
    let status: SubscriptionStatus
    let onSubscribeTap: (() -> Void)?
    private let height: CGFloat
    
    init(status: SubscriptionStatus, height: CGFloat? = nil, onSubscribeTap: (() -> Void)? = nil) {
        self.status = status
        self.height = height ?? 155 // 默认高度为155
        self.onSubscribeTap = onSubscribeTap
    }
    
    var body: some View {
        ZStack(alignment: .leading) {
            // SwiftUI 绘制的背景
            SubscriptionBackground(status: status)
                .frame(maxWidth: .infinity, minHeight: 120)
                .clipped()
            
            // Main content container
            VStack(alignment: .leading, spacing: 0) {
                // Title - Centered vertically
                Text(status.title)
                    .font(.system(size: 28, weight: .bold, design: .rounded))
                    .foregroundColor(status.textColor)
                    .frame(maxHeight: .infinity, alignment: .center) // Center vertically
                    .padding(.leading, 12)
                    .padding(.top, height < 155 ? 30 : 40)
                
                // Expiry date - Bottom left
                if case .pioneer(let expiryDate) = status {
                    VStack(alignment: .leading, spacing: 4) {
                        Text("Expires on :")
                            .font(.system(size: 12))
                            .foregroundColor(.themeTextMessageMain)
                        
                        Text(formatDate(expiryDate))
                            .font(.system(size: 12))
                            .fontWeight(.bold)
                            .foregroundColor(.themeTextMessageMain)
                    }
                    .padding(.leading, 12)
                    .padding(.bottom, 12)
                }
            }
            .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .leading)
        }
        .frame(height: height)
    }
    
    // MARK: - 日期格式化
    private func formatDate(_ date: Date) -> String {
        let formatter = DateFormatter()
        formatter.dateFormat = "MMM d, yyyy"
        return formatter.string(from: date)
    }
}

// MARK: - 背景绘制
private struct SubscriptionBackground: View {
    let status: SubscriptionStatus
    
    var body: some View {
        ZStack(alignment: .topTrailing) {
            RoundedRectangle(cornerRadius: 20)
                .fill(background)
                .shadow(color: Color.black.opacity(0.06), radius: 10, x: 0, y: 6)
            
            // 装饰元素（右上角）
            if case .pioneer = status {
                Circle()
                    .fill(Color.black.opacity(0.08))
                    .frame(width: 90, height: 90)
                    .offset(x: 12, y: -12)
            } else {
                Circle()
                    .fill(Color.black.opacity(0.04))
                    .frame(width: 70, height: 70)
                    .offset(x: 12, y: -12)
            }
        }
        .clipShape(RoundedRectangle(cornerRadius: 20))
    }
    
    private var background: some ShapeStyle {
        switch status {
        case .free:
            return LinearGradient(colors: [Color.white, Color.white.opacity(0.96)], startPoint: .topLeading, endPoint: .bottomTrailing)
        case .pioneer:
            return LinearGradient(colors: [Color.themePrimary.opacity(0.85), Color.orange.opacity(0.6)], startPoint: .topLeading, endPoint: .bottomTrailing)
        }
    }
}

// MARK: - 预览
#Preview {
    VStack(spacing: 20) {
        // Free status preview
        SubscriptionStatusBar(
            status: .free,
            onSubscribeTap: {
                print("Subscribe tapped")
            }
        )
        .padding(.horizontal)
        
        // Pioneer status preview
        SubscriptionStatusBar(
            status: .pioneer(
                expiryDate: Calendar.current.date(byAdding: .month, value: 6, to: Date()) ?? Date()
            )
        )
        .padding(.horizontal)
    }
    .padding()
    .background(Theme.Colors.background)
}