//
//  HomeView.swift
//  demo
//
//  Created by Jason on 2024/1/23.
//

import SwiftUI

struct HomeView: View {
    @State private var selectedTab = 0

    var body: some View {
        ScrollView(.vertical, showsIndicators: false) {
            VStack(spacing: 12) {
                Search
                Banner
                Navigation
                TodayKill
                Living
                Bestselling
                PartyReading
                NewBooks
                Categories
            }
        }
        .frame(maxWidth: .infinity)
        .padding(.horizontal, 12)
        .background(Color.gray.opacity(0.2))
    }

    var Search: some View {
        HStack(alignment: .center, spacing: 16) {
            HStack {
                Image(systemName: "magnifyingglass")
                    .resizable()
                    .frame(width: 18, height: 18)
                    .foregroundColor(Color.gray)
                Text("搜索书籍")
                    .foregroundColor(Color.gray)
                    .font(.system(size: 16))
                Spacer()
            }
            .frame(maxWidth: /*@START_MENU_TOKEN@*/ .infinity/*@END_MENU_TOKEN@*/)
            .padding(12)
            .background(Color.white)
            .cornerRadius(32)
            Image(systemName: "bell")
                .resizable()
                .frame(width: 24, height: 24)
                .overlay(alignment: .topTrailing) {
                    Circle()
                        .fill(Color.red.opacity(0.8))
                        .frame(width: 20, height: 20)
                        .overlay {
                            Text("20")
                                .foregroundColor(Color.white)
                                .font(.system(size: 12))
                        }
                        .offset(x: 8, y: -10)
                }

            Spacer()
        }
    }

    let columns = [GridItem(.flexible()), GridItem(.flexible())]

    var Categories: some View {
        VStack {
            ScrollView(.horizontal, showsIndicators: false) {
                HStack {
                    Text("推荐")
                    Text("竞品书单")
                    Text("少儿")
                    Text("武侠")
                    Text("文创")
                    Text("历史")
                    Text("专辑")
                    Text("世纪难题")
                    Text("个性推荐")
                }
            }

            LazyVGrid(columns: columns, alignment: .center) {
                ForEach(0 ..< 20, id: \.self) { _ in
                    GoodsCard(title: "首页进入的商品标题，如果长了，会不会自动隐藏的问题，这里需要测试")
                }
            }
        }
    }

    var Banner: some View {
        TabView {
            ForEach(1 ..< 4) { index in
                GeometryReader { proxy in
                    let minX = proxy.frame(in: .global).minX
                    Image("Images/banner" + String(index))
                        .resizable()
                        .aspectRatio(contentMode: .fill)
                        .cornerRadius(12)
                        .rotation3DEffect(
                            .degrees(minX / -10),
                            axis: (x: 0.0, y: 1, z: 0.0)
                        )
                }
            }
        }
        .tabViewStyle(.page(indexDisplayMode: .always))
        .frame(height: 220)
        .cornerRadius(12)
    }

    var NewBooks: some View {
        VStack(alignment: .leading) {
            HStack {
                Text("新书上架")
                Spacer()

                Image(systemName: "chevron.forward")
            }

            HStack(alignment: .top) {
                ForEach(0 ..< 4) { _ in
                    VStack {
                        Image("Images/LaunchScreen")
                            .resizable()
                            .frame(maxHeight: 120)
                            .cornerRadius(4)
                        Text("唐伯虎的故事，成就的是谁")
                            .lineLimit(1)
                    }
                    .frame(maxWidth: 100)
                }
            }
        }
        .padding(12)
        .background(Color.white)
        .cornerRadius(12)
    }

    var PartyReading: some View {
        VStack(alignment: .leading) {
            HStack {
                Text("党政读物预订专区")
                    .font(.title3)
                    .foregroundColor(Color.white)
                Spacer()
                ShowMore(title: "全部")
            }
            Text("阅读这10本书，让你深度学习党政相关知识，思想提升")
                .foregroundColor(Color.red)
            Text("治国必先治党，治党才能国强，进入新时代，以习近平通知为核心的党中央以前所未有的勇气和定理推进全面从严治党，")
                .font(.caption)
                .foregroundColor(Color.gray)
                .lineLimit(2)
            ScrollView(.horizontal) {
                HStack(alignment: .top) {
                    ForEach(/*@START_MENU_TOKEN@*/0 ..< 5/*@END_MENU_TOKEN@*/) { _ in
                        VStack {
                            Image("Images/LaunchScreen")
                                .resizable()
                                .frame(maxWidth: 120, maxHeight: 150)
                                .cornerRadius(4)
                            Text("唐伯虎的故事，成就的是谁")
                                .lineLimit(1)
                        }
                        .frame(maxWidth: 100)
                    }
                }
            }
        }
        .padding(12)
        .background(LinearGradient(colors: [Color.red, Color.white], startPoint: UnitPoint.top, endPoint: UnitPoint.bottom))
        .cornerRadius(12)
    }

    var Bestselling: some View {
        VStack(alignment: .leading) {
            HStack {
                Text("畅销图书")
                Spacer()
                Text("全部")
                Image(systemName: "chevron.forward")
            }
            ScrollView(.horizontal) {
                HStack(alignment: .top) {
                    ForEach(/*@START_MENU_TOKEN@*/0 ..< 5/*@END_MENU_TOKEN@*/) { _ in
                        VStack {
                            Image("Images/LaunchScreen")
                                .resizable()
                                .frame(maxWidth: 120, maxHeight: 150)
                                .cornerRadius(4)
                            Text("唐伯虎的故事，成就的是谁")
                                .lineLimit(1)
                            HStack {
                                Image(systemName: "eye")
                                Text("299万")
                            }
                        }
                        .frame(maxWidth: 100)
                    }
                }
            }
        }
        .padding(12)
        .background(Color.white)
        .cornerRadius(12)
    }

    var Living: some View {
        HStack {
            ForEach(0 ..< 3) { _ in
                VStack {
                    HStack {
                        Text("正在直播")
                        Image(systemName: "livephoto")
                    }
                    Image("Images/LaunchScreen")
                        .resizable(resizingMode: /*@START_MENU_TOKEN@*/ .stretch/*@END_MENU_TOKEN@*/)
                        .aspectRatio(contentMode: .fit)
                        .frame(maxWidth: 120)
                        .cornerRadius(12)
                }
                .background(Color.pink.opacity(0.5))
                .cornerRadius(12)
            }
        }
    }

    var TodayKill: some View {
        VStack(alignment: .leading) {
            VStack(alignment: .leading) {
                HStack {
                    Text("今日秒杀")
                        .foregroundColor(Color.white)
                        .font(.system(size: 16))
                    KillCountDown()
                }
                .padding(8)
                .background(LinearGradient(colors: [Color.yellow.opacity(0.3), Color.white.opacity(0.3)], startPoint: .leading, endPoint: .bottom))
                HStack(spacing: 12) {
                    Image("Images/LaunchScreen")
                        .resizable(resizingMode: /*@START_MENU_TOKEN@*/ .stretch/*@END_MENU_TOKEN@*/)
                        .frame(maxWidth: 120, maxHeight: 150)
                        .overlay(alignment: .bottom) {
                            Text("剩余100")
                                .font(.system(size: 14))
                                .foregroundColor(Color.white)
                                .frame(maxWidth: .infinity)
                                .padding(.vertical, 4)
                                .background(Color.red.opacity(0.5))
                        }
                        .cornerRadius(8)
                    VStack {
                        Text("石床垫：阿特伍德黑暗就故事（有的人说啥就是啥呢有的人说啥就是啥呢有的人说啥就是啥呢）")
                            .font(.system(size: 20))
                            .multilineTextAlignment(/*@START_MENU_TOKEN@*/ .leading/*@END_MENU_TOKEN@*/)
                            .lineLimit(/*@START_MENU_TOKEN@*/2/*@END_MENU_TOKEN@*/)
                            .foregroundColor(Color.white)
                        Text("￥19.99")
                            .foregroundColor(Color.red)
                            .padding(12)
                            .cornerRadius(12)
                            .background(Color.white)
                        HStack {
                            Text("抢购")
                                .font(.system(size: 14))
                            Image(systemName: "chevron.forward")
                        }
                        .foregroundColor(Color.white)
                    }
                    .frame(height: 150)
                }
            }
            .padding(12)
            VStack {
                ScrollView(.horizontal) {
                    HStack {
                        ForEach(0 ..< 8) { _ in
                            VStack {
                                Image("Images/LaunchScreen")
                                    .antialiased(true)
                                    .resizable(resizingMode: .stretch)
                                    .frame(maxWidth: 100, maxHeight: 130)
                                Text("是石床垫：阿特伍德黑暗就故事")
                                    .font(.system(size: 14))
                                    .lineLimit(1)
                                CamelPrice(amount: 19.99, size: 12)
                            }
                            .padding(4)
                            .frame(maxWidth: 110)
                            .background(Color.white)
                            .cornerRadius(4)
                        }
                    }
                }
            }
            .padding(12)
            .background(Color.white.opacity(0.3))
        }
        .frame(maxWidth: /*@START_MENU_TOKEN@*/ .infinity/*@END_MENU_TOKEN@*/)
        .background(Color.pink)
        .cornerRadius(12)
    }

    var Navigation: some View {
        HStack(spacing: 32) {
            ForEach(/*@START_MENU_TOKEN@*/0 ..< 5/*@END_MENU_TOKEN@*/) { _ in
                VStack {
                    Image("Images/logo")
                        .resizable(resizingMode: /*@START_MENU_TOKEN@*/ .stretch/*@END_MENU_TOKEN@*/)
                        .aspectRatio(contentMode: .fit)
                        .background(Color.white)
                        .cornerRadius(64)

                    Text("图书")
                        .font(.system(size: 14))
                }
            }
        }
    }
}

#Preview {
    HomeView()
}