import SwiftUI

struct AnalysisHomeView: View {
    var body: some View {
        ZStack {
            Color.zxBg0.ignoresSafeArea()
            VStack(spacing: 0) {
                HStack {
                    Text("学习分析").font(.system(size: 22, weight: .heavy)).foregroundColor(Color.zxF0).tracking(-0.5)
                    Spacer()
                    HStack(spacing: 4) { Text("近 7 天").font(.system(size: 12)).foregroundColor(Color.zxF05); Image(systemName: "chevron.down").font(.system(size: 10)).foregroundColor(Color.zxF04) }
                        .padding(.horizontal, 12).padding(.vertical, 6).background(Color.zxFill005).clipShape(Capsule()).overlay(Capsule().stroke(Color.zxBorder008, lineWidth: 1))
                }
                .padding(.horizontal, 20).padding(.top, ZXSpacing.statusBarH + 16).padding(.bottom, 12)
                ScrollView {
                    VStack(spacing: 16) {
                        HStack(spacing: 12) {
                            ZXStatBadge(icon: "trophy.fill", label: "综合掌握", value: "65%", trend: "+8%", color: Color.zxPurple)
                            ZXStatBadge(icon: "bolt.fill", label: "本周积分", value: "1,240", trend: "+320", color: Color.zxOrange)
                            ZXStatBadge(icon: "exclamationmark.triangle.fill", label: "待巩固", value: "23", trend: "-5", color: Color.zxYellow)
                            ZXStatBadge(icon: "chart.line.uptrend.xyaxis", label: "连续天", value: "14", trend: "🔥", color: Color.zxGreen)
                        }
                        VStack(alignment: .leading, spacing: 16) {
                            HStack { Text("掌握度趋势").font(.system(size: 14, weight: .bold)).foregroundColor(Color.zxF0); Spacer(); Text("↑ +8% 本周").font(.system(size: 12, weight: .semibold)).foregroundColor(Color.zxGreen) }
                            ZXChartView()
                        }.padding(16).background(Color.zxFill004).overlay(RoundedRectangle(cornerRadius: 20).stroke(Color.zxBorder006, lineWidth: 1)).clipShape(RoundedRectangle(cornerRadius: 20))
                        VStack(alignment: .leading, spacing: 12) {
                            HStack { HStack(spacing: 8) { Image(systemName: "exclamationmark.triangle.fill").font(.system(size: 14)).foregroundColor(Color.zxYellow); Text("薄弱知识点").font(.system(size: 15, weight: .bold)).foregroundColor(Color.zxF0) }; Spacer(); NavigationLink(destination: WeakPointsPage()) { Text("全部 23 个").font(.system(size: 12)).foregroundColor(Color.zxPurple) } }
                            NavigationLink(destination: KnowledgeDetailPage()) { ZXWeakRow(score: 32, topic: "贝叶斯定理应用", lib: "机器学习", priority: "高") }.foregroundColor(.primary)
                            NavigationLink(destination: KnowledgeDetailPage()) { ZXWeakRow(score: 41, topic: "正态分布性质", lib: "高等数学", priority: "高") }.foregroundColor(.primary)
                            ZXWeakRow(score: 55, topic: "词根 spect- 相关词汇", lib: "英语词汇", priority: "中")
                        }
                    }.padding(.horizontal, 20).padding(.bottom, 120)
                }.scrollIndicators(.hidden)
            }
        }
    }
}

struct ZXStatBadge: View { let icon: String; let label: String; let value: String; let trend: String; let color: Color
    var body: some View {
        VStack(spacing: 3) {
            Image(systemName: icon).font(.system(size: 14)).foregroundColor(color)
            Text(value).font(.system(size: 16, weight: .heavy)).foregroundColor(Color.zxF0)
            Text(label).font(.system(size: 9)).foregroundColor(Color.zxF04).multilineTextAlignment(.center)
        }.frame(maxWidth: .infinity).frame(height: 72).padding(.vertical, 4).background(color.opacity(0.06)).overlay(RoundedRectangle(cornerRadius: 14).stroke(color.opacity(0.15), lineWidth: 1)).clipShape(RoundedRectangle(cornerRadius: 14))
    }
}

struct ZXChartView: View {
    let data: [(String, CGFloat)] = [("一", 0.62), ("二", 0.65), ("三", 0.71), ("四", 0.68), ("五", 0.75), ("六", 0.79), ("今", 0.78)]
    var body: some View {
        VStack(spacing: 0) {
            GeometryReader { g in
                ZStack(alignment: .topLeading) {
                    Path { path in let w = g.size.width / 7
                        for (i, d) in data.enumerated() { let x = w * CGFloat(i) + w / 2; let y = (1 - d.1) * g.size.height
                            if i == 0 { path.move(to: CGPoint(x: x, y: y)) } else { path.addLine(to: CGPoint(x: x, y: y)) } }
                    }.stroke(Color.zxPurple, style: StrokeStyle(lineWidth: 2, lineCap: .round, lineJoin: .round))
                }
            }.frame(height: 100)
            HStack(spacing: 0) { ForEach(data, id: \.0) { d in Text(d.0).font(.system(size: 9)).foregroundColor(Color(hex: "#F0F0FF", opacity: 0.35)).frame(maxWidth: .infinity) } }
        }
    }
}