//
//  ChatListVC.swift
//  yinmeng-ios
//
//  Created by yinmeng on 2024/2/27.
//  回话列表

import UIKit
import NIMSDK
class ChatListVC: BaseViewController, HiddenNavigationBarProtocol {

	var list:NSMutableArray?

	deinit {
		NIMSDK.shared().loginManager.remove(self)
		NIMSDK.shared().conversationManager.remove(self)
	}

    override func viewDidLoad() {
        super.viewDidLoad()
		NIMSDK.shared().conversationManager.add(self)
		NIMSDK.shared().loginManager.add(self)
		getList()
		view.addSubview(backImgView)
		view.addSubview(tableView)
		view.addSubview(clearBtn)
		view.addSubview(titleLb)

		backImgView.snp.makeConstraints { make in
			make.edges.equalTo(view)
		}

		tableView.snp.makeConstraints { make in
			make.left.right.bottom.equalToSuperview()
			make.top.equalToSuperview().offset(NavHeight)
		}

		clearBtn.snp.makeConstraints { make in
make.size.equalTo(CGSize(width: 28, height: 28))
			make.right.equalToSuperview().offset(-16)
			make.top.equalToSuperview().offset(StatusBarHeight + 8)
		}

		titleLb.snp.makeConstraints { make in
make.centerY.equalTo(clearBtn)
			make.left.equalToSuperview().offset(16)
		}
    }

	private lazy var tableView: UITableView = {
		let tableView = UITableView(frame: .zero, style: .plain)
		tableView.delegate = self
		tableView.dataSource = self
		tableView.tableFooterView = UIView()
		tableView.separatorStyle = .none
		tableView.backgroundColor = .clear
		if #available(iOS 11.0, *) {
			tableView.contentInsetAdjustmentBehavior = .never
		}
		tableView.register(cellType: ChatListCell.self)
		return tableView
	}()

	
	private lazy var backImgView: UIImageView = {
		let imageView = UIImageView()
		imageView.image = UIImage(named: "auth_login_bg")
		imageView.isUserInteractionEnabled = true
		imageView.layer.masksToBounds = true
		imageView.contentMode = .scaleAspectFill
		return imageView
	}()

	private lazy var clearBtn: UIButton = {
		let button = UIButton(type: .custom)
		button.setImage(UIImage(named: "chat_clear"), for: .normal)
		button.setImage(UIImage(named: "chat_clear"), for: .selected)
		button.addTarget(self, action: #selector(clearClick), for: .touchUpInside)
		return button
	}()

	private lazy var titleLb: UILabel = {
		let label = UILabel()
		label.textColor = .white
		label.text = "消息中心"
		label.font = UIFont.systemFont(ofSize: 18, weight: .medium)
		return label
	}()

	@objc func clearClick() {
		NIMSDK.shared().conversationManager.markAllMessagesRead()
	}

}

extension ChatListVC: UITableViewDelegate, UITableViewDataSource {
	func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
		let cell = tableView.dequeueReusableCell(for: indexPath, cellType: ChatListCell.self)
		if indexPath.row < list?.count ?? 0 {
			let res = list?.object(at: indexPath.row) as? NIMRecentSession
			cell.rescent = res
		}
		return cell
	}

	func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
		return list?.count ?? 0
	}

	func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
		return 82
	}

	func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
		tableView.deselectRow(at: indexPath, animated: true)
		if indexPath.row < list?.count ?? 0 {
			let res = list?.object(at: indexPath.row) as? NIMRecentSession
			if let session = res?.session {
				let chat = ChatVC(session: session)
				self.navigationController?.pushViewController(chat, animated: true)
			}
		}
	}
}

extension ChatListVC: NIMConversationManagerDelegate, NIMLoginManagerDelegate {
	func onLogin(_ step: NIMLoginStep) {
		if (step == .syncOK) {
			getList()
		}
	}

	func didLoadAllRecentSessionCompletion() {
         getList()
	}

	func didAdd(_ recentSession: NIMRecentSession, totalUnreadCount: Int) {
		var isInList = false
		for index in 0..<(list?.count ?? 0) {
			let recent = list?[index] as? NIMRecentSession
			if recent?.session?.sessionId == recentSession.session?.sessionId{
				isInList = true
				list?.replaceObject(at: index, with: recentSession)
				break
			}
		}
		if isInList == false {
			list?.add(recentSession)
		}
		mai_sortMessages()
		updateItemBadge()
	}

	func didUpdate(_ recentSession: NIMRecentSession, totalUnreadCount: Int) {
		var isInList = false
		for index in 0..<(list?.count ?? 0) {
			let session = list?[index] as? NIMRecentSession
			if session?.session?.sessionId == recentSession.session?.sessionId{
				isInList = true
				list?.replaceObject(at: index, with: recentSession)
				break
			}
		}
		if isInList == false {
			list?.add(recentSession)
		}
		mai_sortMessages()
		updateItemBadge()
	}

	func didRemove(_ recentSession: NIMRecentSession, totalUnreadCount: Int) {
		let arr = NSArray.init(object: recentSession.session as Any)
		NIMSDK.shared().conversationManager.deleteRemoteSessions(arr as! [NIMSession], completion: nil)
		tableView.reloadData()
	}
}

extension ChatListVC {

	fileprivate func getList() {
		if let array = NIMSDK.shared().conversationManager.allRecentSessions() {
			list = NSMutableArray.init(array: array)
			mai_sortMessages()
		}
	}

	fileprivate func mai_sortMessages() -> Void {
		var arr = list?.sortedArray(options: NSSortOptions.stable, usingComparator: { obj1, obj2 in
			let item1 = obj1 as? NIMRecentSession
			let item2 = obj2 as? NIMRecentSession
			let time1 = (item1?.lastMessage?.timestamp ?? 0) as Double
			let time2 = (item2?.lastMessage?.timestamp ?? 0) as Double
			if time1 < time2{
				return .orderedDescending
			}
			return .orderedAscending
		})

		if let array = arr {
			list = NSMutableArray(array: array)
		}
		tableView.reloadData()
	}


	private func updateItemBadge() {
		let unreadCount = NIMSDK.shared().conversationManager.allUnreadCount()
		self.tabBarItem.badgeValue = "\(unreadCount)"
	}
}