//
//  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 "Free"
        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)?
    let size: String
    private let height: CGFloat
    private let backgroundColor: Color?
    
    init(status: SubscriptionStatus, height: CGFloat? = nil, backgroundColor: Color? = nil, onSubscribeTap: (() -> Void)? = nil, size: String? = "md") {
        self.status = status
        self.height = height ?? 155 // 默认高度为155
        self.backgroundColor = backgroundColor
        self.onSubscribeTap = onSubscribeTap
        self.size = size ?? "md"
    }
    
    var body: some View {   
        ZStack(alignment: .leading) {
            // SwiftUI 绘制的背景
            SubscriptionBackground(status: status, customBackground: backgroundColor, size: size)
                .frame(maxWidth: .infinity, minHeight: 120)
                .clipped()
            
            // Main content container
            VStack(alignment: .leading, spacing: 0) {
                // Title - Centered vertically
                Text(status.title)
                    .font(.system(size: size == "sm" ? 24 : 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
    let customBackground: Color?
    let size: String
    
    private let parallelogramHeight: CGFloat
    private let parallelogramWidth: CGFloat

    init(status: SubscriptionStatus,  customBackground: Color? = nil, size: String? = "md") {
        self.status = status
        self.customBackground = customBackground
        self.size = size ?? "md"
        self.parallelogramHeight = size == "sm" ? 14 : 18
        self.parallelogramWidth = size == "sm" ? 12 : 16
    }

    var body: some View {
        ZStack {
            // 背景底板：自定义颜色优先，否则根据状态给出渐变
            if let color = customBackground {
                RoundedRectangle(cornerRadius: 10)
                    .fill(color)
                    .shadow(color: Color.black.opacity(0.06), radius: 10, x: 0, y: 6)
            } else {
                RoundedRectangle(cornerRadius: 10)
                    .fill(defaultBackground)
                    .shadow(color: Color.black.opacity(0.06), radius: 10, x: 0, y: 6)
            }

            // 左上角斜条纹（装饰）
            VStack {
                HStack {
                    ParallelogramRow(
                        count: 6,
                        itemSize: CGSize(width: parallelogramWidth, height: parallelogramHeight),
                        shear: -0.35,
                        cornerRadius: 2,
                        color: .black.opacity(0.85),
                        spacing: 1
                    )
                    Spacer()
                }
                Spacer()
            }
            .padding(.top, 12)
            .padding(.leading, 16)

            // 右下角斜条纹（装饰）
            VStack {
                Spacer()
                HStack {
                    Spacer()
                    ParallelogramRow(
                        count: 3,
                        itemSize: CGSize(width: parallelogramWidth, height: parallelogramHeight),
                        shear: -0.35,
                        cornerRadius: 2,
                        color: .black.opacity(0.85),
                        spacing: 1
                    )
                }
            }
            .padding(.bottom, 14)
            .padding(.trailing, 16)

            // 右上角圆形徽标 + 三角指针（与示例类似）
            VStack {
                HStack {
                    Spacer()
                    ZStack {
                        CircleView(diameter: size == "sm" ? 70 : 100, color: .black)
                        TriangleView(
                            width: size == "sm" ? 20 : 24,
                            height: size == "sm" ? 20 : 24,
                            direction: .right,
                            color: Color(white: 0.9),
                            rotation: .degrees(157)
                        )
                    }
                    .offset(x: size == "sm" ? 8 : 12, y: size == "sm" ? -8 : -12)
                }
                Spacer()
            }
        }
        .clipShape(RoundedRectangle(cornerRadius: 16))
    }
    
    private var defaultBackground: LinearGradient {
        switch status {
        case .free:
            return LinearGradient(colors: [Color(hex: "FFF8DE")], 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,
            backgroundColor: Color(white: 0.98),
            onSubscribeTap: {
                print("Subscribe tapped")
            }
        )
        .padding(.horizontal)
        
        // Pioneer status preview
        SubscriptionStatusBar(
            status: .pioneer(
                expiryDate: Calendar.current.date(byAdding: .month, value: 6, to: Date()) ?? Date()
            ),
            backgroundColor: Color.orange.opacity(0.9)
        )
        .padding(.horizontal)
    }
    .padding()
    .background(Theme.Colors.background)
}