//
//  ForayTableViewController.swift
//  foray
//
//  Created by Nicholas Tay on 14/3/2022.
//

import UIKit

struct YearSection {
    var year: Int
    var items: [PenguinItemViewModel]
}

class ForayTableViewController: UITableViewController, ForayCoordinated {
    
    let presenter: PenguinItemPresenter = PenguinItemPresenter()
    var coordinator: ForayCoordinator?
    
    // MARK: - Static data TEMP
    
    var sections = [YearSection]()
    
    // MARK: - On load
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "Foray"
        
        tableView.rowHeight = UITableView.automaticDimension
        
        // Register our custom cell
        tableView.register(ForayTableViewCell.self, forCellReuseIdentifier: "ForayTableViewCell")
        
        // Not sure if this is the right way to go about this...
        coordinator?.showLoading()
        reloadApiData()
        
        self.refreshControl = UIRefreshControl()
        self.refreshControl?.addTarget(self, action: #selector(doRefresh), for: UIControl.Event.valueChanged)
    }
    
    @objc func doRefresh(sender: AnyObject) {
        reloadApiData()
    }
    
    func reloadApiData() {
        presenter.fetch(receiver: { (data: [PenguinItemViewModel]) in
            let groups = Dictionary(grouping: data) { $0.year }
            self.sections = groups.map { (key, values) in
                return YearSection(year: key, items: values)
            }
            // Sort the sections from oldest year to newest
            self.sections.sort { (lhs, rhs) in lhs.year < rhs.year }
            
            self.tableView.reloadData()
            self.refreshControl?.endRefreshing()
            self.coordinator?.hideLoading()
        })
    }
    
    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        // Returns number of sections for table
        return self.sections.count
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // Returns number of rows for table's section
        return self.sections[section].items.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let item = self.sections[indexPath.section].items[indexPath.row]
        
        let type: String
        let icon: UIImage
        switch item.type {
        case .item:
            type = "Item"
            icon = UIImage(named: item.id)!
        case .quest:
            type = "Quest"
            icon = UIImage(named: "spy")!
        }
        
        let cell: ForayTableViewCell = tableView.dequeueReusableCell(withIdentifier: "ForayTableViewCell", for: indexPath) as! ForayTableViewCell
        cell.setData(name: item.name, desc: type + "ID: " + item.id, img: icon)
        return cell
    }
    
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return "Released in \(self.sections[section].year)"
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        
        let item = self.sections[indexPath.section].items[indexPath.row]
        self.coordinator?.showDetails(item: item)
    }
}