import SwiftUI
import UIKit

/// 邀请好友(mock:后端暂无邀请接口,用 user.id 当邀请码占位,对齐安卓 InviteScreen 的 mock 状态)。
struct InviteView: View {
    @Environment(SessionStore.self) private var session
    @State private var copied = false

    private var inviteCode: String {
        if let id = session.user?.id { return String(format: "%06d", id) }
        return "------"
    }

    var body: some View {
        VStack(spacing: 20) {
            Image(systemName: "gift.fill")
                .font(.system(size: 56))
                .foregroundStyle(AppColors.brand)
            Text("邀请好友一起省钱").font(.title3.bold())
            Text("把傻瓜比价推荐给好友,一起比价领券")
                .font(.subheadline).foregroundStyle(.secondary)
                .multilineTextAlignment(.center)

            VStack(spacing: 6) {
                Text("我的邀请码").font(.caption).foregroundStyle(.secondary)
                Text(inviteCode).font(.system(.largeTitle, design: .monospaced).bold())
            }
            .padding(24)
            .frame(maxWidth: .infinity)
            .background(AppColors.primaryBg)
            .clipShape(RoundedRectangle(cornerRadius: 14))
            .padding(.horizontal, 32)

            Button {
                UIPasteboard.general.string = inviteCode
                copied = true
            } label: {
                Text(copied ? "已复制" : "复制邀请码")
                    .font(.headline)
                    .frame(maxWidth: .infinity)
                    .padding(.vertical, 14)
                    .background(AppColors.primary)
                    .foregroundStyle(.black)
                    .clipShape(RoundedRectangle(cornerRadius: 12))
            }
            .padding(.horizontal, 32)

            Spacer()
        }
        .padding(.top, 40)
        .navigationTitle("邀请好友")
        .navigationBarTitleDisplayMode(.inline)
    }
}