//
//  GroupIconListView.swift
//  QuickLocation
//
//  Created by 八条 on 2026/6/2.
//

import UIKit
import RxSwift
import RxCocoa

class GroupIconListView: UIView {

    var disposeBag = DisposeBag()
    
    var selectedIndex: Int = 1 {
        didSet {
            selectedIconView.image = UIImage(named: "GroupIcon/\(selectedIndex)")
            iconCollectionView.reloadData()
        }
    }
    
    private var iconImgList: [UIImage] = []
    
    private func setupRx() {
        
        backBtn.rx.tap.subscribe(onNext: { _ in
            AppRouter.shared.popOrDismiss()
        }).disposed(by: disposeBag)
    }
    
    private func setupUI() {
        addSubview(navBgView)
        addSubview(navBarView)
        navBarView.addSubview(navTitleLabel)
        navBarView.addSubview(backBtn)
        addSubview(selectedIconView)
        addSubview(titleLab)
        addSubview(iconCollectionView)
        
        navBgView.layoutChain
            .edges(excludingEdge: .bottom)
            .heightToWidth(160/375)
        
        navBarView.layoutChain
            .edges(excludingEdge: .bottom)
            .height(kNaviHeight)
        
        navTitleLabel.layoutChain
            .top(kStatusBarHeight + 12)
            .centerY(backBtn)
            .centerX()
        
        backBtn.layoutChain
            .centerY(navTitleLabel)
            .left(15)
            .width(24)
            .height(24)
        
        selectedIconView.layoutChain
            .topToBottomOfView(navBarView, offset: 30)
            .centerX()
            .width(80)
            .height(80)
        
        titleLab.layoutChain
            .topToBottomOfView(selectedIconView, offset: 39)
            .left(40)
        
        iconCollectionView.layoutChain
            .topToBottomOfView(titleLab, offset: 13)
            .edgesHorzontal(40)
            .bottom(kSafeBottomMargin + 10)
    }
    
    lazy var navBgView: UIImageView = {
        let iv = UIImageView()
        iv.image = UIImage(named: "Common/navBar_bg_2")
        iv.contentMode = .scaleAspectFill
        return iv
    }()
    
    lazy var navBarView: UIView = {
        let view = UIView()
        view.backgroundColor = .clear
        return view
    }()

    lazy var navTitleLabel: UILabel = {
        let label = UILabel()
        label.text = "更换图标"
        label.font = .systemFont(ofSize: 18, weight: .medium)
        label.textColor = ThemeManager.shared.color.titleAuxColor
        label.textAlignment = .center
        return label
    }()
    
    lazy var backBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setImage(UIImage(named: "Common/back"), for: .normal)
        btn.extendEdgeInsets = UIEdgeInsets(top: 54, left: 15, bottom: 100, right: 100)
        return btn
    }()
    
    lazy var selectedIconView: UIImageView = {
        let view = UIImageView()
        view.cornerRadius = 40
        return view
    }()
    
    lazy var titleLab: UILabel = {
        let label = UILabel()
        label.text = "选择图标"
        label.font = .systemFont(ofSize: 16, weight: .bold)
        label.textColor = ThemeManager.shared.color.titleAuxColor
        return label
    }()
    
    lazy var iconCollectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        let cvWidth = kScreenWidth - 80
        let spacing: CGFloat = 18
        let itemW = (cvWidth - spacing * 3) / 4
        layout.itemSize = CGSize(width: itemW, height: itemW)
        layout.minimumInteritemSpacing = spacing
        layout.minimumLineSpacing = 20

        let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
        cv.backgroundColor = .clear
        cv.isScrollEnabled = false
        cv.register(GroupIconCell.self)
        cv.delegate = self
        cv.dataSource = self
        return cv
    }()
    
    override init(frame: CGRect) {
        super.init(frame: .zero)
        backgroundColor = .white
        setupUI()
        setupRx()
        
        for i in 1...11 {
            if let img = UIImage(named: "GroupIcon/\(i)") {
                iconImgList.append(img)
            }
        }
    }

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

// MARK: - UICollectionViewDelegate, UICollectionViewDataSource
extension GroupIconListView: UICollectionViewDelegate, UICollectionViewDataSource {

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return iconImgList.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(for: indexPath) as GroupIconCell
        cell.configure(img: iconImgList[indexPath.row], isSelected: selectedIndex == indexPath.row+1)
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        selectedIndex = indexPath.row + 1
    }
}

// MARK: - TagCell
final class GroupIconCell: UICollectionViewCell {

    func configure(img: UIImage, isSelected: Bool) {
        iconImgView.image = img
        selectedMaskView.isHidden = !isSelected
        selectedIcon.isHidden = !isSelected
    }
    
    private func setupUI() {
        contentView.addSubview(iconImgView)
        contentView.addSubview(selectedMaskView)
        contentView.addSubview(selectedIcon)
        
        iconImgView.layoutChain.edges()
        selectedMaskView.layoutChain.edges()
        
        selectedIcon.layoutChain
            .right(3)
            .bottom(4)
    }
    
    lazy var iconImgView: UIImageView = {
        let view = UIImageView()
        view.backgroundColor = .clear
        view.contentMode = .scaleAspectFill
        view.cornerRadius = 10
        return view
    }()
    
    lazy var selectedMaskView: UIView = {
        let view = UIView()
        view.backgroundColor = .black.withAlphaComponent(0.5)
        view.cornerRadius = 10
        view.isHidden = true
        return view
    }()
    
    lazy var selectedIcon: UIImageView = {
        let view = UIImageView()
        view.image = UIImage(named: "GroupIcon/selected")
        view.isHidden = true
        return view
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }

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