#if os(iOS)
import SwiftUI
import Charts

struct StatsView: View {
    let index: BundleIndex

    struct DayVal: Identifiable { let id = UUID(); let label: String; let value: Int }
    struct MonthVal: Identifiable { let id = UUID(); let label: String; let value: Int }
    struct YearVal: Identifiable { let id = UUID(); let label: String; let hours: Double }

    var weekSeries: [DayVal] {
        let arr = (index.stats.global.week_total_minutes, index.stats.global) // placeholder; real daily array不可用
        // 因数据包 week 只给总和，无法还原每日；占位 7 段按衰减示例
        let total = Double(index.stats.global.week_total_minutes)
        return (0..<7).map { i in
            let frac = (7.0-Double(i))*1.0/28.0 + 0.05
            return DayVal(label: ["今","昨","2","3","4","5","6"][i], value: Int(total * frac / 2.0))
        }
    }

    var body: some View {
        ScrollView {
            VStack(alignment:.leading, spacing: 24) {
                Text("阅读统计").font(.title2).bold().padding(.top)
                // 气泡指标
                let g = index.stats.global
                let metrics: [BubbleMetric] = [
                    BubbleMetric(label: "全年", display: String(format: "%d小时", g.year_total_minutes/60), valueMinutes: Double(g.year_total_minutes), color: .blue),
                    BubbleMetric(label: "月均", display: String(format: "%d分钟", g.month_avg_minutes), valueMinutes: Double(g.month_avg_minutes), color: .purple),
                    BubbleMetric(label: "近7天", display: String(format: "%d分钟", g.week_total_minutes), valueMinutes: Double(g.week_total_minutes), color: .pink),
                    BubbleMetric(label: "日均", display: String(format: "%d分钟", g.day_avg_minutes), valueMinutes: Double(g.day_avg_minutes), color: .yellow),
                    BubbleMetric(label: "已读", display: String(format: "%d本", g.finished_books_count), valueMinutes: Double(g.finished_books_count*60), color: .green)
                ]
                BubbleMetricsView(metrics: metrics)
                // 占位周数据图
                Chart(weekSeries) { item in
                    BarMark(x: .value("Day", item.label), y: .value("Min", item.value))
                }.frame(height: 180)
                Text("说明: 因数据包未携带逐日数组，这里周图为占位模拟。可扩展导出添加 daily 数组。")
                    .font(.footnote).foregroundColor(.secondary)
                // 年度平均小时散点（使用 readtime_year）
                let yearHours = Double(g.year_total_minutes)/60.0
                HStack { Text("全年总时长约 \(String(format: "%.1f", yearHours)) 小时").font(.headline); Spacer() }
            }
            .padding(.horizontal)
        }
    }
}
#endif