//
//  medicine.swift
//  medicine
//
//  Created by richard on 2025/11/13.
//

import WidgetKit
import SwiftUI

// MARK: - 用药数据模型
struct MedicationItem: Codable, Identifiable {
    let id: String
    let name: String
    let dosage: String
    let scheduledTime: String
    let status: String
    let medicationId: String
    let recordId: String?
    let image: String?
}

struct MedicationWidgetData: Codable {
    let medications: [MedicationItem]
    let lastSyncTime: String
    let date: String
}

// MARK: - Timeline Provider
struct Provider: AppIntentTimelineProvider {
    func placeholder(in context: Context) -> MedicationEntry {
        MedicationEntry(
            date: Date(),
            medications: [],
            displayDate: formatDate(Date()),
            lastSyncTime: Date().timeIntervalSince1970
        )
    }

    func snapshot(for configuration: ConfigurationAppIntent, in context: Context) async -> MedicationEntry {
        let medicationData = loadMedicationDataFromAppGroup()
        let lastSyncTimeInterval = parseTimeInterval(from: medicationData.lastSyncTime)
        return MedicationEntry(
            date: Date(),
            medications: medicationData.medications,
            displayDate: medicationData.date,
            lastSyncTime: lastSyncTimeInterval
        )
    }
    
    func timeline(for configuration: ConfigurationAppIntent, in context: Context) async -> Timeline<MedicationEntry> {
        let currentDate = Date()
        let medicationData = loadMedicationDataFromAppGroup()
        let lastSyncTimeInterval = parseTimeInterval(from: medicationData.lastSyncTime)
        let entry = MedicationEntry(
            date: currentDate,
            medications: medicationData.medications,
            displayDate: medicationData.date,
            lastSyncTime: lastSyncTimeInterval
        )
        
        // 下次更新时间 - 每15分钟更新一次
        let nextUpdate = Calendar.current.date(byAdding: .minute, value: 15, to: currentDate)!
        return Timeline(entries: [entry], policy: .after(nextUpdate))
    }
}

// MARK: - Timeline Entry
struct MedicationEntry: TimelineEntry {
    let date: Date
    let medications: [MedicationItem]
    let displayDate: String
    let lastSyncTime: TimeInterval
}

// MARK: - Widget View
struct medicineEntryView: View {
    var entry: Provider.Entry
    
    var body: some View {
        VStack(spacing: 8) {
            // 日期标题
            Text(entry.displayDate)
                .font(.caption)
                .foregroundColor(.secondary)
            
            // 用药列表
            if entry.medications.isEmpty {
                Text("今日无用药计划")
                    .font(.body)
                    .foregroundColor(.secondary)
            } else {
                LazyVStack(spacing: 6) {
                    ForEach(entry.medications, id: \.id) { medication in
                        MedicationRowView(medication: medication)
                    }
                }
            }
            
            Spacer()
            
            // 底部信息
            Text("最后更新: \(formatTime(from: entry.lastSyncTime))")
                .font(.caption2)
                .foregroundColor(Color.secondary)
        }
        .padding()
    }
}

// MARK: - 用药行视图
struct MedicationRowView: View {
    let medication: MedicationItem
    
    var body: some View {
        HStack {
            // 状态指示器
            Circle()
                .fill(statusColor)
                .frame(width: 8, height: 8)
            
            VStack(alignment: .leading, spacing: 2) {
                Text(medication.name)
                    .font(.caption)
                    .fontWeight(.medium)
                    .lineLimit(1)
                
                Text("\(medication.scheduledTime) • \(medication.dosage)")
                    .font(.caption2)
                    .foregroundColor(.secondary)
            }
            
            Spacer()
            
            // 状态标签
            Text(statusText)
                .font(.caption2)
                .padding(.horizontal, 8)
                .padding(.vertical, 2)
                .background(statusColor.opacity(0.2))
                .foregroundColor(statusColor)
                .cornerRadius(4)
        }
        .padding(.vertical, 2)
    }
    
    private var statusColor: Color {
        switch medication.status {
        case "taken":
            return .green
        case "missed":
            return .red
        default:
            return .blue
        }
    }
    
    private var statusText: String {
        switch medication.status {
        case "taken":
            return "已服用"
        case "missed":
            return "已错过"
        default:
            return "待服用"
        }
    }
}

// MARK: - Widget Configuration
struct medicine: Widget {
    let kind: String = "medicine"

    var body: some WidgetConfiguration {
        AppIntentConfiguration(kind: kind, intent: ConfigurationAppIntent.self, provider: Provider()) { entry in
            medicineEntryView(entry: entry)
                .containerBackground(.fill.tertiary, for: .widget)
        }
        .configurationDisplayName("用药计划")
        .description("显示今日用药计划和服药状态")
    }
}

// MARK: - Helper Functions
private func loadMedicationDataFromAppGroup() -> MedicationWidgetData {
    guard let userDefaults = UserDefaults(suiteName: "group.com.anonymous.digitalpilates") else {
        print("❌ Failed to initialize UserDefaults with App Group")
        return MedicationWidgetData(
            medications: [],
            lastSyncTime: Date().toISOString(),
            date: formatDate(Date())
        )
    }
    
    guard let dataJson = userDefaults.string(forKey: "widget_medication_data") else {
        print("⚠️ No medication data found in App Group UserDefaults")
        return MedicationWidgetData(
            medications: [],
            lastSyncTime: Date().toISOString(),
            date: formatDate(Date())
        )
    }
    
    print("✅ Found medication data JSON: \(dataJson.prefix(100))...")
    
    guard let data = dataJson.data(using: .utf8) else {
        print("❌ Failed to convert JSON string to Data")
        return MedicationWidgetData(
            medications: [],
            lastSyncTime: Date().toISOString(),
            date: formatDate(Date())
        )
    }
    
    do {
        let medicationData = try JSONDecoder().decode(MedicationWidgetData.self, from: data)
        print("✅ Successfully decoded medication data: \(medicationData.medications.count) medications")
        return medicationData
    } catch {
        print("❌ Failed to decode medication data: \(error)")
        return MedicationWidgetData(
            medications: [],
            lastSyncTime: Date().toISOString(),
            date: formatDate(Date())
        )
    }
}

private func formatDate(_ date: Date) -> String {
    let formatter = DateFormatter()
    formatter.dateFormat = "M月d日"
    return formatter.string(from: date)
}

private func formatTime(from timeInterval: TimeInterval) -> String {
    let date = Date(timeIntervalSince1970: timeInterval)
    let formatter = DateFormatter()
    formatter.timeStyle = .short
    formatter.locale = Locale(identifier: "zh_CN")
    return formatter.string(from: date)
}

/// 解析时间间隔 - 支持ISO字符串和时间戳
private func parseTimeInterval(from string: String) -> TimeInterval {
    // 尝试直接转换为数字（时间戳）
    if let timestamp = Double(string) {
        return timestamp
    }
    
    // 尝试解析ISO 8601格式
    let isoFormatter = ISO8601DateFormatter()
    isoFormatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
    if let date = isoFormatter.date(from: string) {
        return date.timeIntervalSince1970
    }
    
    // 尝试不带毫秒的ISO格式
    isoFormatter.formatOptions = [.withInternetDateTime]
    if let date = isoFormatter.date(from: string) {
        return date.timeIntervalSince1970
    }
    
    // 如果都失败，返回当前时间
    return Date().timeIntervalSince1970
}

/// 将Date转换为ISO字符串（辅助函数）
extension Date {
    func toISOString() -> String {
        let formatter = ISO8601DateFormatter()
        formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
        return formatter.string(from: self)
    }
}

extension ConfigurationAppIntent {
    fileprivate static var smiley: ConfigurationAppIntent {
        let intent = ConfigurationAppIntent()
        intent.favoriteEmoji = "😀"
        return intent
    }
    
    fileprivate static var starEyes: ConfigurationAppIntent {
        let intent = ConfigurationAppIntent()
        intent.favoriteEmoji = "🤩"
        return intent
    }
}

#Preview(as: .systemSmall) {
    medicine()
} timeline: {
    MedicationEntry(date: .now, medications: [], displayDate: formatDate(Date()), lastSyncTime: Date().timeIntervalSince1970)
    MedicationEntry(date: .now, medications: [], displayDate: formatDate(Date()), lastSyncTime: Date().timeIntervalSince1970)
}