import WidgetKit
import SwiftUI

// V1：写死文案的小组件（Small/Medium/Large + 点击跳转 Home）

struct EmotionProvider: TimelineProvider {
    func placeholder(in context: Context) -> EmotionEntry {
        EmotionEntry(date: Date())
    }

    func getSnapshot(in context: Context, completion: @escaping (EmotionEntry) -> ()) {
        completion(EmotionEntry(date: Date()))
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<EmotionEntry>) -> ()) {
        // V1：内容写死，不做数据更新；给一个较长的刷新间隔（系统仍可能自行调度）
        let entry = EmotionEntry(date: Date())
        let nextUpdate = Calendar.current.date(byAdding: .day, value: 7, to: Date())
            ?? Date().addingTimeInterval(60 * 60 * 24 * 7)
        completion(Timeline(entries: [entry], policy: .after(nextUpdate)))
    }
}

struct EmotionEntry: TimelineEntry {
    let date: Date
}

struct EmotionWidgetView: View {
    var entry: EmotionProvider.Entry
    @Environment(\.widgetFamily) var family

    private let title = "正念"
    private let text = "你已经很努力了，今天也值得被温柔对待。"
    private let deepLink = URL(string: "client:///(app)/home")

    var body: some View {
        switch family {
        case .systemSmall:
            smallView()
        case .systemMedium:
            mediumView()
        case .systemLarge:
            largeView()
        default:
            smallView()
        }
    }

    // 统一的“卡片背景”风格（iOS 15 兼容）
    private func cardBackground(colors: [Color]) -> some View {
        ZStack {
            LinearGradient(
                colors: colors,
                startPoint: .topLeading,
                endPoint: .bottomTrailing
            )
            // 轻微光斑，增加层次
            RadialGradient(
                gradient: Gradient(colors: [Color.white.opacity(0.16), Color.white.opacity(0.0)]),
                center: .topTrailing,
                startRadius: 10,
                endRadius: 180
            )
        }
        .overlay(
            RoundedRectangle(cornerRadius: 18, style: .continuous)
                .stroke(Color.white.opacity(0.14), lineWidth: 1)
        )
        .cornerRadius(18)
    }

    private func chip(_ text: String) -> some View {
        Text(text)
            .font(.system(size: 12, weight: .semibold))
            .foregroundColor(Color.white.opacity(0.9))
            .padding(.horizontal, 10)
            .padding(.vertical, 6)
            .background(Color.white.opacity(0.14))
            .cornerRadius(999)
    }

    private func smallView() -> some View {
        ZStack {
            cardBackground(colors: [
                Color(red: 0.06, green: 0.08, blue: 0.12),
                Color(red: 0.13, green: 0.16, blue: 0.22),
            ])

            VStack(alignment: .leading, spacing: 10) {
                HStack {
                    chip(title)
                    Spacer(minLength: 0)
                }

                Text(text)
                    .font(.system(size: 15, weight: .semibold))
                    .foregroundColor(Color.white.opacity(0.92))
                    .lineSpacing(2)
                    .lineLimit(4)

                Spacer(minLength: 0)

                Text("点我回到 App")
                    .font(.system(size: 11, weight: .medium))
                    .foregroundColor(Color.white.opacity(0.65))
            }
            .padding(14)
        }
        .widgetURL(deepLink)
    }

    private func mediumView() -> some View {
        ZStack {
            cardBackground(colors: [
                Color(red: 0.06, green: 0.08, blue: 0.12),
                Color(red: 0.09, green: 0.11, blue: 0.17),
            ])

            HStack(alignment: .top, spacing: 14) {
                VStack(alignment: .leading, spacing: 10) {
                    chip(title)
                    Text(text)
                        .font(.system(size: 17, weight: .semibold))
                        .foregroundColor(Color.white.opacity(0.92))
                        .lineSpacing(3)
                        .lineLimit(5)

                    Spacer(minLength: 0)

                    Text("轻轻呼吸，回到当下")
                        .font(.system(size: 12, weight: .medium))
                        .foregroundColor(Color.white.opacity(0.7))
                }

                // 右侧装饰区：让版面更饱满
                VStack(alignment: .trailing, spacing: 8) {
                    Text(entry.date, style: .time)
                        .font(.system(size: 12, weight: .semibold))
                        .foregroundColor(Color.white.opacity(0.8))
                    Spacer(minLength: 0)
                    Text("今日")
                        .font(.system(size: 28, weight: .bold))
                        .foregroundColor(Color.white.opacity(0.12))
                }
            }
            .padding(16)
        }
        .widgetURL(deepLink)
    }

    private func largeView() -> some View {
        ZStack {
            cardBackground(colors: [
                Color(red: 0.06, green: 0.08, blue: 0.12),
                Color(red: 0.14, green: 0.18, blue: 0.28),
            ])

            VStack(alignment: .leading, spacing: 14) {
                HStack {
                    chip(title)
                    Spacer(minLength: 0)
                    Text(entry.date, style: .time)
                        .font(.system(size: 12, weight: .semibold))
                        .foregroundColor(Color.white.opacity(0.78))
                }

                Text(text)
                    .font(.system(size: 20, weight: .semibold))
                    .foregroundColor(Color.white.opacity(0.92))
                    .lineSpacing(4)
                    .lineLimit(8)

                Spacer(minLength: 0)

                HStack {
                    Text("点我回到 Home")
                        .font(.system(size: 12, weight: .medium))
                        .foregroundColor(Color.white.opacity(0.7))
                    Spacer(minLength: 0)
                    Text("🌿")
                        .font(.system(size: 18))
                        .opacity(0.9)
                }
            }
            .padding(18)
        }
        .widgetURL(deepLink)
    }
}

@main
struct EmotionWidget: Widget {
    let kind: String = "EmotionWidget"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: EmotionProvider()) { entry in
            EmotionWidgetView(entry: entry)
        }
        .configurationDisplayName("情绪小组件")
        .description("一段温柔提醒，陪你回到当下。")
        .supportedFamilies([.systemSmall, .systemMedium, .systemLarge])
    }
}