//
//  WaterWidget.swift
//  WaterWidget
//
//  Created by richard on 2025/9/9.
//

import WidgetKit
import SwiftUI

// Data model for water intake
struct WaterData {
    let currentIntake: Int
    let targetIntake: Int
    let quickAddAmount: Int
    let progressPercentage: Double
    
    init(currentIntake: Int = 0, targetIntake: Int = 2000, quickAddAmount: Int = 150) {
        self.currentIntake = currentIntake
        self.targetIntake = targetIntake
        self.quickAddAmount = quickAddAmount
        self.progressPercentage = min(Double(currentIntake) / Double(targetIntake), 1.0)
    }
}

struct Provider: AppIntentTimelineProvider {
    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), configuration: ConfigurationAppIntent(), waterData: WaterData())
    }

    func snapshot(for configuration: ConfigurationAppIntent, in context: Context) async -> SimpleEntry {
        // In a real app, you would fetch the actual water data here
        let waterData = await fetchWaterData()
        return SimpleEntry(date: Date(), configuration: configuration, waterData: waterData)
    }
    
    func timeline(for configuration: ConfigurationAppIntent, in context: Context) async -> Timeline<SimpleEntry> {
        var entries: [SimpleEntry] = []
        let currentDate = Date()
        
        // Fetch current water data
        let waterData = await fetchWaterData()
        
        // Generate timeline entries for every hour for the next 5 hours
        for hourOffset in 0 ..< 5 {
            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
            let entry = SimpleEntry(date: entryDate, configuration: configuration, waterData: waterData)
            entries.append(entry)
        }

        // Refresh every 15 minutes to keep data current
        return Timeline(entries: entries, policy: .after(Calendar.current.date(byAdding: .minute, value: 15, to: currentDate)!))
    }
    
    // Fetch water data from shared App Group storage
    private func fetchWaterData() async -> WaterData {
        guard let sharedDefaults = UserDefaults(suiteName: "group.com.anonymous.digitalpilates") else {
            print("Failed to access App Group UserDefaults")
            return WaterData() // Return default data
        }
        
        // Read data using the same keys as defined in widgetDataSync.ts
        let currentIntake = sharedDefaults.object(forKey: "widget_current_water_intake") as? Int ?? 0
        let targetIntake = sharedDefaults.object(forKey: "widget_daily_water_goal") as? Int ?? 2000
        let quickAddAmount = sharedDefaults.object(forKey: "widget_quick_add_amount") as? Int ?? 150
        
        print("Widget data loaded - Current: \(currentIntake)ml, Target: \(targetIntake)ml, Quick: \(quickAddAmount)ml")
        
        return WaterData(
            currentIntake: currentIntake,
            targetIntake: targetIntake,
            quickAddAmount: quickAddAmount
        )
    }
}

struct SimpleEntry: TimelineEntry {
    let date: Date
    let configuration: ConfigurationAppIntent
    let waterData: WaterData
}

struct WaterWidgetEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        VStack(spacing: 0) {
            // Header with title and add button
            HStack {
                Text("喝水")
                    .font(.system(size: 14, weight: .medium))
                    .foregroundColor(Color(red: 0.098, green: 0.129, blue: 0.149))
                
                Spacer()
                
                // Quick add water button
                Button(intent: AddWaterIntent(amount: entry.waterData.quickAddAmount)) {
                    HStack(spacing: 2) {
                        Text("+")
                        Text("\(entry.waterData.quickAddAmount)ml")
                    }
                    .font(.system(size: 10, weight: .bold))
                    .foregroundColor(Color(red: 0.388, green: 0.4, blue: 0.945))
                    .padding(.horizontal, 6)
                    .padding(.vertical, 5)
                    .background(Color(red: 0.882, green: 0.906, blue: 1.0))
                    .cornerRadius(16)
                }
                .buttonStyle(PlainButtonStyle())
            }
            .padding(.bottom, 8)
            
            Spacer()
            
            // Progress visualization - simplified bar chart representation
            HStack(spacing: 2) {
                ForEach(0..<12, id: \.self) { index in
                    RoundedRectangle(cornerRadius: 1)
                        .fill(index < Int(entry.waterData.progressPercentage * 12) ? 
                              Color(red: 0.49, green: 0.827, blue: 0.988) : 
                              Color(red: 0.941, green: 0.976, blue: 1.0))
                        .frame(width: 3, height: 12)
                }
            }
            .padding(.bottom, 8)
            
            // Water intake stats
            HStack(alignment: .firstTextBaseline, spacing: 2) {
                Text("\(entry.waterData.currentIntake)")
                    .font(.system(size: 14, weight: .semibold))
                    .foregroundColor(Color(red: 0.098, green: 0.129, blue: 0.149))
                
                Text("ml")
                    .font(.system(size: 14, weight: .semibold))
                    .foregroundColor(Color(red: 0.098, green: 0.129, blue: 0.149))
                
                Text("/ \(entry.waterData.targetIntake)ml")
                    .font(.system(size: 12))
                    .foregroundColor(Color(red: 0.42, green: 0.447, blue: 0.502))
            }
        }
        .padding(16)
        .containerBackground(.fill.tertiary, for: .widget)
    }
}

struct WaterWidget: Widget {
    let kind: String = "WaterWidget"

    var body: some WidgetConfiguration {
        AppIntentConfiguration(kind: kind, intent: ConfigurationAppIntent.self, provider: Provider()) { entry in
            WaterWidgetEntryView(entry: entry)
        }
        .configurationDisplayName("饮水记录")
        .description("追踪你的每日饮水量，快速添加饮水记录")
        .supportedFamilies([.systemSmall])
    }
}

extension ConfigurationAppIntent {
    fileprivate static var defaultConfig: ConfigurationAppIntent {
        return ConfigurationAppIntent()
    }
}

#Preview(as: .systemSmall) {
    WaterWidget()
} timeline: {
    SimpleEntry(date: .now, configuration: .defaultConfig, waterData: WaterData(currentIntake: 500, targetIntake: 2000, quickAddAmount: 150))
    SimpleEntry(date: .now, configuration: .defaultConfig, waterData: WaterData(currentIntake: 1200, targetIntake: 2000, quickAddAmount: 200))
    SimpleEntry(date: .now, configuration: .defaultConfig, waterData: WaterData(currentIntake: 1800, targetIntake: 2000, quickAddAmount: 150))
}