//
//  XSHomeNewViewController.swift
//  XSeri
//
//  Created by 长沙鸿瑶 on 2025/12/31.
//

import UIKit
import SnapKit

class XSHomeNewViewController: XSHomeChildViewController {
    
    private lazy var dataArr: [XSShortModel] = []
    private lazy var page: Int = 1
    
    
    private lazy var layout: UICollectionViewCompositionalLayout = {
        let layout = UICollectionViewCompositionalLayout { section, environment in
            
            
            if section == 0 {
                let headerItem = NSCollectionLayoutBoundarySupplementaryItem(layoutSize: .init(widthDimension: .fractionalWidth(1), heightDimension: .absolute(32)), elementKind: UICollectionView.elementKindSectionHeader, alignment: .top)
                
                let item = NSCollectionLayoutItem(layoutSize: .init(widthDimension: .fractionalWidth(1), heightDimension: .fractionalHeight(1)))
                let group = NSCollectionLayoutGroup.horizontal(layoutSize: .init(widthDimension: .absolute(210), heightDimension: .absolute(360)), subitems: [item])
                let layoutSection = NSCollectionLayoutSection(group: group)
                layoutSection.interGroupSpacing = 15
                layoutSection.orthogonalScrollingBehavior = .continuous
                layoutSection.contentInsets = .init(top: 0, leading: 16, bottom: 0, trailing: 16)
                layoutSection.boundarySupplementaryItems = [headerItem]
                return layoutSection
            } else {
                let headerItem = NSCollectionLayoutBoundarySupplementaryItem(layoutSize: .init(widthDimension: .fractionalWidth(1), heightDimension: .absolute(57)), elementKind: UICollectionView.elementKindSectionHeader, alignment: .top)
                
                let item = NSCollectionLayoutItem(layoutSize: .init(widthDimension: .fractionalWidth(1), heightDimension: .fractionalHeight(1)))
                let group = NSCollectionLayoutGroup.horizontal(layoutSize: .init(widthDimension: .fractionalWidth(1), heightDimension: .absolute(146)), subitems: [item])
                
                let layoutSection = NSCollectionLayoutSection(group: group)
                layoutSection.interGroupSpacing = 12
                layoutSection.contentInsets = .init(top: 0, leading: 16, bottom: 0, trailing: 16)
                layoutSection.boundarySupplementaryItems = [headerItem]
                return layoutSection
            }
        }
        return layout
    }()
    
    private lazy var collectionView: XSCollectionView = {
        let collectionView = XSCollectionView(frame: .zero, collectionViewLayout: layout)
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.contentInset = .init(top: 0, left: 0, bottom: XSScreen.customTabBarHeight + 10, right: 0)
        collectionView.xs_addRefreshHeader { [weak self] in
            self?.handleHeaderRefresh(nil)
        }
        collectionView.xs_addRefreshFooter(insetBottom: 0) { [weak self] in
            self?.handleFooterRefresh(nil)
        }
        collectionView.register(XSHomeNewBigCell.self, forCellWithReuseIdentifier: "XSHomeNewBigCell")
        collectionView.register(XSHomeNewCell.self, forCellWithReuseIdentifier: "XSHomeNewCell")
        collectionView.register(XSHomeNewTitleView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "title")
        return collectionView
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()

        xs_setupUI()
        
        Task {
            await requestDataArr(page: 1)
        }
    }
    
    override func handleHeaderRefresh(_ completer: (() -> Void)?) {
        Task {
            await requestDataArr(page: 1)
            self.collectionView.xs_endHeaderRefreshing()
        }
    }
    
    override func handleFooterRefresh(_ completer: (() -> Void)?) {
        Task {
            await requestDataArr(page: self.page + 1)
            self.collectionView.xs_endFooterRefreshing()
        }
    }


}

extension XSHomeNewViewController {
    
    private func xs_setupUI() {
        view.addSubview(collectionView)
        
        collectionView.snp.makeConstraints { make in
            make.left.right.bottom.equalToSuperview()
            make.top.equalToSuperview().offset(self.topHeight + 13)
        }
        
    }
    
}

//MARK: UICollectionViewDelegate UICollectionViewDataSource
extension XSHomeNewViewController: UICollectionViewDelegate, UICollectionViewDataSource {
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        var model: XSShortModel
        if indexPath.section == 0 {
            model = self.dataArr[indexPath.row]
        } else {
            model = self.dataArr[indexPath.row + 3]
        }
        
        
        if indexPath.section == 0 {
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "XSHomeNewBigCell", for: indexPath) as! XSHomeNewBigCell
            cell.model = model
            return cell
        } else {
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "XSHomeNewCell", for: indexPath) as! XSHomeNewCell
            cell.model = model
            return cell
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        let totalCount = self.dataArr.count
        if section == 0 {
            return min(3, totalCount)
        } else {
            return totalCount - 3
        }
    }
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        if self.dataArr.count > 3 {
            return 2
        } else if self.dataArr.count > 0 {
            return 1
        } else {
            return 0
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
        let view = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "title", for: indexPath) as! XSHomeNewTitleView
        view.titleLabel.text = "New Releases".localized
        return view
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        var model: XSShortModel
        if indexPath.section == 0 {
            model = self.dataArr[indexPath.row]
        } else {
            model = self.dataArr[indexPath.row + 3]
        }
        let vc = XSShortDetailViewController()
        vc.shortId = model.short_play_id
        self.navigationController?.pushViewController(vc, animated: true)
    }
}

extension XSHomeNewViewController {
    
    private func requestDataArr(page: Int) async {
        guard let list = await XSHomeAPI.requestHomeNew(page: page) else { return }
        if page == 1 {
            self.dataArr.removeAll()
        }
        self.page = page
        self.dataArr += list
        
        self.collectionView.reloadData()
    }
    
}