import SwiftUI
import SwiftData

/// 单条「导出身体档案」详情。只读 Markdown + 复制 / 分享 / 删除。
struct HealthExportDetailView: View {
    @Environment(\.modelContext) private var ctx
    @Environment(\.dismiss) private var dismiss

    let export: HealthExport

    @State private var copiedFlash: Bool = false
    @State private var showDeleteConfirm = false

    var body: some View {
        VStack(spacing: 0) {
            header
            ScrollView {
                VStack(alignment: .leading, spacing: 16) {
                    metaBar
                    promptBlock
                    MarkdownView(text: export.content)
                        .padding(16)
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .background(
                            RoundedRectangle(cornerRadius: Tj.Radius.md, style: .continuous)
                                .fill(Tj.Palette.paper)
                        )
                        .overlay(
                            RoundedRectangle(cornerRadius: Tj.Radius.md, style: .continuous)
                                .strokeBorder(Tj.Palette.lineSoft, lineWidth: 1)
                        )
                }
                .padding(.horizontal, 20)
                .padding(.vertical, 16)
            }
            actionRow
        }
        .background(Tj.Palette.sand.ignoresSafeArea())
        .alert("永久删除这份导出?", isPresented: $showDeleteConfirm) {
            Button("删除", role: .destructive) {
                ctx.delete(export)
                try? ctx.save()
                dismiss()
            }
            Button("取消", role: .cancel) {}
        } message: {
            Text("删除后无法恢复。源记录(指标、症状等)不受影响。")
        }
    }

    private var header: some View {
        HStack(alignment: .center, spacing: 12) {
            Button { dismiss() } label: {
                Image(systemName: "xmark")
                    .font(.system(size: 16, weight: .semibold))
                    .foregroundStyle(Tj.Palette.text)
                    .frame(width: 32, height: 32)
                    .background(Circle().fill(Tj.Palette.sand2))
            }
            VStack(alignment: .leading, spacing: 2) {
                Text("身体档案 · 历史导出")
                    .font(.tjH2())
                    .foregroundStyle(Tj.Palette.text)
                Text(Self.absoluteDate(export.createdAt))
                    .font(.system(size: 11))
                    .foregroundStyle(Tj.Palette.text3)
            }
            Spacer()
            TjLockChip()
        }
        .padding(.horizontal, 20)
        .padding(.vertical, 14)
        .background(Tj.Palette.sand)
        .overlay(alignment: .bottom) {
            Rectangle().fill(Tj.Palette.lineSoft).frame(height: 1)
        }
    }

    private var metaBar: some View {
        HStack(spacing: 10) {
            TjBadge(text: export.modelTag, style: .neutral)
            if export.decodeRate > 0 {
                Text(String(format: "%.1f tok/s", export.decodeRate))
                    .font(.system(size: 11, design: .monospaced))
                    .foregroundStyle(Tj.Palette.leaf)
            }
            Spacer()
            if let from = export.inferredTimeFromDate, let to = export.inferredTimeToDate {
                Text("\(Self.shortDate(from)) — \(Self.shortDate(to))")
                    .font(.system(size: 11, design: .monospaced))
                    .foregroundStyle(Tj.Palette.text3)
            }
        }
    }

    private var promptBlock: some View {
        HStack(alignment: .top, spacing: 8) {
            Image(systemName: "quote.opening")
                .font(.system(size: 12))
                .foregroundStyle(Tj.Palette.text3)
            Text(export.prompt)
                .font(.system(size: 13))
                .foregroundStyle(Tj.Palette.text2)
        }
        .padding(12)
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(
            RoundedRectangle(cornerRadius: Tj.Radius.sm, style: .continuous)
                .fill(Tj.Palette.sand2)
        )
    }

    private var actionRow: some View {
        HStack(spacing: 10) {
            Button { copy() } label: {
                Label(copiedFlash ? "已复制" : "复制", systemImage: copiedFlash ? "checkmark" : "doc.on.doc")
            }
            .buttonStyle(TjGhostButton(height: 44, fontSize: 13, horizontalPadding: 14))

            ShareLink(item: export.content) {
                Label("分享", systemImage: "square.and.arrow.up")
                    .font(.system(size: 13, weight: .semibold))
                    .tracking(1)
                    .foregroundStyle(Tj.Palette.ink)
                    .padding(.horizontal, 14)
                    .frame(height: 44)
                    .background(Capsule().strokeBorder(Tj.Palette.ink, lineWidth: 1))
                    .contentShape(Capsule())   // 纯描边胶囊:内边距区也可点
            }

            Spacer()

            Button(role: .destructive) {
                showDeleteConfirm = true
            } label: {
                Image(systemName: "trash")
                    .font(.system(size: 15, weight: .medium))
                    .foregroundStyle(Tj.Palette.brick)
                    .frame(width: 44, height: 44)
                    .background(Circle().strokeBorder(Tj.Palette.brick.opacity(0.4), lineWidth: 1))
            }
        }
        .padding(.horizontal, 20)
        .padding(.vertical, 12)
        .background(Tj.Palette.paper)
        .overlay(alignment: .top) {
            Rectangle().fill(Tj.Palette.lineSoft).frame(height: 1)
        }
    }

    private func copy() {
        UIPasteboard.general.string = export.content
        copiedFlash = true
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.4) {
            copiedFlash = false
        }
    }

    private static func absoluteDate(_ d: Date) -> String {
        d.formatted(.dateTime.year().month().day().hour().minute())
    }

    private static func shortDate(_ d: Date) -> String {
        let f = DateFormatter()
        f.locale = Locale(identifier: "en_US_POSIX")
        f.dateFormat = "MM-dd"
        return f.string(from: d)
    }
}

#Preview {
    let exp = HealthExport(
        prompt: "我感冒3天了,把最近一个月的健康情况给医生看",
        content: """
        # 就诊摘要 — 感冒就诊

        ## 主诉
        患者男,38 岁,感冒 3 天未愈。

        ## 患者背景
        - 高血压 2 年
        - 在服药:缬沙坦 80mg qd
        """,
        inferredTimeFromDate: Calendar.current.date(byAdding: .day, value: -30, to: .now),
        inferredTimeToDate: .now,
        inferredIntent: "cold_consult",
        decodeRate: 24.3
    )
    return HealthExportDetailView(export: exp)
}