//
//  CreateSchedulePopView.swift
//  QuickLocation
//
//  Created by 八条 on 2026/6/23.
//

import UIKit
import RxSwift
import RxCocoa
import RxDataSources
import BRPickerView

// MARK: - 行程点编辑模型
struct SchedulePointItem: IdentifiableType, Equatable {
    let identity: String = UUID().uuidString
    var locationName: String = ""
    var address: String = ""
    var expectedTime: Date?
    var remark: String = ""
}

typealias SchedulePointSection = SectionModel<String, SchedulePointItem>

// MARK: - CreateSchedulePopView

class CreateSchedulePopView: UIView {

    var disposeBag = DisposeBag()

    let pointsRelay = BehaviorRelay<[SchedulePointItem]>(value: [SchedulePointItem()])

    // MARK: - Setup

    private func setupRx() {
        dateLab.rx.tapGesture.subscribe { _ in
            let picker = BRDatePickerView(pickerMode: .YMD)
            picker.minDate = Date()
            picker.maxDate = Calendar.current.date(byAdding: .day, value: 6, to: Date())
            let style = BRPickerStyle()
            style.selectRowTextColor = UIColor(hexStr: "#16B3FF")
            picker.pickerStyle = style
            picker.resultBlock = { [weak self] selectDate, value in
                guard let date = selectDate else { return }
                let fmt = DateFormatter()
                fmt.dateFormat = "yyyy年MM月dd日"
                self?.dateLab.text = fmt.string(from: date)
            }
            picker.show()
        }.disposed(by: disposeBag)

        // 新增行程点
        addBtn.rx.tap
            .subscribe(onNext: { [weak self] _ in
                guard let self = self else { return }
                var list = self.pointsRelay.value
                list.append(SchedulePointItem(
                    locationName: "",
                    address: "",
                    expectedTime: nil,
                    remark: ""
                ))
                self.pointsRelay.accept(list)
            })
            .disposed(by: disposeBag)

        // 绑定 tableView
        pointsRelay
            .observe(on: MainScheduler.asyncInstance)
            .map { [SchedulePointSection(model: "", items: $0)] }
            .bind(to: tableView.rx.items(dataSource: dataSource))
            .disposed(by: disposeBag)

        // 动态更新 tableView 高度
        pointsRelay
            .subscribe(onNext: { [weak self] items in
                guard let self = self else { return }
                let rowHeight: CGFloat = 122
                var h = CGFloat(items.count) * rowHeight
                h = max(h, rowHeight)
                self.tableView.layoutChain.height(h)
            })
            .disposed(by: disposeBag)
    }

    private lazy var dataSource: RxTableViewSectionedReloadDataSource<SchedulePointSection> = {
        RxTableViewSectionedReloadDataSource<SchedulePointSection>(
            configureCell: { [weak self] _, tv, indexPath, item in
                let cell: SchedulePointCell = tv.dequeueReusableCell(for: indexPath)
                cell.configure(item: item,
                               index: indexPath.row,
                               total: self?.pointsRelay.value.count ?? 0,
                               onDelete: { [weak self] in
                    guard let self = self else { return }
                    var list = self.pointsRelay.value
                    guard indexPath.row < list.count else { return }
                    list.remove(at: indexPath.row)
                    self.pointsRelay.accept(list)
                })
                return cell
            })
    }()

    // MARK: - UI

    private func setupUI() {
        addSubview(lineView)
        addSubview(dateView)
        addSubview(detailView)
        addSubview(scrollView)

        lineView.layoutChain
            .top(15)
            .centerX()
            .width(36)
            .height(4)

        dateView.layoutChain
            .topToBottomOfView(lineView, offset: 19)
            .edgesHorzontal()
            .height(22)

        detailView.layoutChain
            .topToBottomOfView(dateView, offset: 20)
            .edgesHorzontal()
            .height(22)
        
        scrollView.layoutChain
            .topToBottomOfView(detailView, offset: 15)
            .edges(excludingEdge: .top)
    }

    // MARK: - Views

    lazy var lineView: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#EBEBEB")
        v.cornerRadius = 2
        return v
    }()

    lazy var dateView: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        let titleLab = UILabel()
        titleLab.text = "行程日期："
        titleLab.font = .systemFont(ofSize: 14, weight: .medium)
        titleLab.textColor = ThemeManager.shared.color.titleAuxColor
        view.addSubview(titleLab)
        titleLab.layoutChain.left(15).centerY()
        view.addSubview(dateLab)
        dateLab.layoutChain.leftToRightOfView(titleLab).centerY()
        return view
    }()

    lazy var dateLab: UILabel = {
        let label = UILabel()
        label.font = .systemFont(ofSize: 14, weight: .medium)
        label.textColor = UIColor(hexStr: "#16B3FF")
        label.isUserInteractionEnabled = true
        let fmt = DateFormatter()
        fmt.dateFormat = "yyyy年MM月dd日"
        label.text = fmt.string(from: Date())
        return label
    }()

    lazy var detailView: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        let titleLab = UILabel()
        titleLab.text = "行程详情"
        titleLab.font = .systemFont(ofSize: 14, weight: .medium)
        titleLab.textColor = ThemeManager.shared.color.titleAuxColor
        view.addSubview(titleLab)
        titleLab.layoutChain.left(15).centerY()
        view.addSubview(addBtn)
        addBtn.layoutChain.right(15).centerY().width(18).height(18)
        return view
    }()

    lazy var addBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "Schedule/add"), for: .normal)
        btn.backgroundColor = .clear
        btn.extendEdgeInsets = UIEdgeInsets(top: 30, left: 10, bottom: 10, right: 15)
        return btn
    }()

    lazy var scrollView: UIScrollView = {
        let view = UIScrollView()
        view.backgroundColor = .white
        view.showsHorizontalScrollIndicator = false
        view.bounces = false
        
        let contentView = UIView()
        contentView.backgroundColor = .clear
        view.addSubview(contentView)
        contentView.layoutChain
            .edges().widthToView(view)
        
        contentView.addSubview(tableView)
        tableView.layoutChain
            .top()
            .edgesHorzontal()
        
        contentView.addSubview(createBtn)
        createBtn.layoutChain
            .topToBottomOfView(tableView, offset: 30)
            .edgesHorzontal(30)
            .height(50)
            .bottom(kSafeBottomMargin + 10)
        
        return view
    }()

    lazy var tableView: UITableView = {
        let tv = UITableView(frame: .zero, style: .plain)
        tv.backgroundColor = .clear
        tv.separatorStyle = .none
        tv.estimatedRowHeight = 122
        tv.isScrollEnabled = false
        tv.showsVerticalScrollIndicator = false
        tv.bounces = false
        tv.register(SchedulePointCell.self)
        return tv
    }()

    lazy var createBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setTitle("立即创建", for: .normal)
        btn.setTitleColor(.white, for: .normal)
        btn.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        btn.setBackgroundImage(UIImage(named: "Common/button_bg_2"), for: .normal)
        btn.cornerRadius = 25
        return btn
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .white
        setupUI()
        setupRx()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        layoutIfNeeded()
        setCornerRadius(corners: [.topLeft, .topRight], withCornerRadii: CGSize(width: 30, height: 30))
    }
}

// MARK: - SchedulePointCell

class SchedulePointCell: UITableViewCell {

    var disposeBag = DisposeBag()

    func configure(item: SchedulePointItem, index: Int, total: Int, onDelete: @escaping () -> Void) {
        disposeBag = DisposeBag()
        indexLabel.text = "\(index + 1)"
        locationLabel.text = item.locationName.isEmpty ? "点击选择地点" : item.locationName

        if let expectedTime = item.expectedTime {
            timeLabel.text = formatTime(expectedTime)
        }
        else {
            timeLabel.text = "请选择到达时间"
        }
        
        // 左侧竖线：仅有一条时不显示虚线，首条顶部不画、末条底部不画
        topDashView.isHidden = total <= 1 || index == 0
        bottomDashView.isHidden = total <= 1 || index == total - 1

        // 删除
        deleteBtn.rx.tap
            .subscribe(onNext: { onDelete() })
            .disposed(by: disposeBag)
    }

    private func formatTime(_ date: Date) -> String {
        let fmt = DateFormatter()
        fmt.dateFormat = "HH:mm"
        return fmt.string(from: date)
    }

    // MARK: - Init

    override init(style: CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        setupViews()
    }

    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

    private func setupViews() {
        contentView.addSubview(topDashView)
        contentView.addSubview(pointIcon)
        contentView.addSubview(bottomDashView)

        contentView.addSubview(cardView)
        cardView.addSubview(cardCornerView)
        cardCornerView.addSubview(indexLabel)
        cardCornerView.addSubview(locationLabel)
        cardCornerView.addSubview(timeLabel)
        cardCornerView.addSubview(remarkTF)
        cardCornerView.addSubview(deleteBtn)

        topDashView.layoutChain
            .top().width(2)

        pointIcon.layoutChain
            .centerY()
            .left(22)
            .width(18).height(18)

        topDashView.layoutChain
            .centerX(pointIcon)
            .bottomToTopOfView(pointIcon, offset: -10)
        
        bottomDashView.layoutChain
            .topToBottomOfView(pointIcon, offset: 10)
            .centerX(pointIcon)
            .width(2)
            .bottom()

        // 右侧卡片
        cardView.layoutChain
            .top(15)
            .leftToRightOfView(pointIcon, offset: 20)
            .right(15)
            .height(92)
            .bottom(15)

        cardCornerView.layoutChain.edges()
        
        indexLabel.layoutChain
            .top().left()
            .width(30).height(20)

        locationLabel.layoutChain
            .topToBottomOfView(indexLabel, offset: 10)
            .left(10)

        timeLabel.layoutChain
            .centerY(locationLabel)
            .leftToRightOfView(locationLabel, offset: 38)

        deleteBtn.layoutChain
            .bottom(15).right(15)
            .width(14).height(14)
        
        remarkTF.layoutChain
            .topToBottomOfView(locationLabel, offset: 15)
            .leftToView(locationLabel)
            .rightToLeftOfView(deleteBtn, offset: -10)
    }

    // MARK: - Views
    private let topDashView: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#E0E0E0")
        v.isHidden = true
        return v
    }()

    private let pointIcon: UIImageView = {
        let iv = UIImageView(image: UIImage(named: "Schedule/point"))
        iv.contentMode = .scaleAspectFit
        return iv
    }()

    private let bottomDashView: UIView = {
        let v = UIView()
        v.backgroundColor = UIColor(hexStr: "#E0E0E0")
        v.isHidden = true
        return v
    }()

    private let cardView: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        view.layer.shadowColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.05).cgColor
        view.layer.shadowOffset = CGSize(width: 0, height: 0)
        view.layer.shadowOpacity = 1
        view.layer.shadowRadius = 8
        return view
    }()
    
    lazy var cardCornerView: UIView = {
        let view = UIView()
        view.backgroundColor = .white
        view.cornerRadius = 10
        return view
    }()

    private let indexLabel: UILabel = {
        let l = UILabel()
        l.backgroundColor = UIColor(hexStr: "#DCF4FF")
        l.textColor = UIColor(hexStr: "#176F9B")
        l.font = .systemFont(ofSize: 12, weight: .medium)
        l.textAlignment = .center
        return l
    }()

    private let locationLabel: UILabel = {
        let l = UILabel()
        l.font = .systemFont(ofSize: 14, weight: .medium)
        l.textColor = UIColor(hexStr: "#333333")
        l.lineBreakMode = .byTruncatingTail
        return l
    }()

    private let timeLabel: UILabel = {
        let l = UILabel()
        l.font = .systemFont(ofSize: 12, weight: .medium)
        l.textColor = UIColor(hexStr: "#333333")
        l.isUserInteractionEnabled = true
        return l
    }()
    
    lazy var remarkTF: UITextField = {
        let tf = UITextField()
        tf.font = .systemFont(ofSize: 12)
        tf.placeholder = "在此添加备注..."
        tf.returnKeyType = .done
        return tf
    }()

    private let deleteBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "Schedule/delete"), for: .normal)
        btn.extendEdgeInsets = UIEdgeInsets(top: 10, left: 15, bottom: 15, right: 15)
        return btn
    }()
    
    override func layoutSubviews() {
        super.layoutSubviews()
        cardCornerView.layoutIfNeeded()
        indexLabel.setCornerRadius(corners: [.bottomRight], withCornerRadii: CGSize(width: 10, height: 10))
    }
}