LibraryManager2.0.swift

//
//  LibraryManager.swift
//  Folium
//
//  Created by Jarrod Norwell on 15/5/2024.
//

import Foundation

class LibraryManager {
    static let shared = LibraryManager()
    
    var cytrusManager = CytrusManager.shared
    var grapeManager = GrapeManager.shared
    var kiwiManager = KiwiManager.shared
    
    func library() throws {
        func crawler(_ core: Core) throws -> (core: Core, urls: [URL]) {
            enum CrawlerError : Error {
                case enumeratorFailed
            }
            
            let documentsDirectory = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
            guard let enumerator = FileManager.default.enumerator(at: documentsDirectory.appendingPathComponent(core.rawValue, conformingTo: .folder),
                                                                  includingPropertiesForKeys: [.isRegularFileKey]) else {
                throw CrawlerError.enumeratorFailed
            }
            
            return (core, try enumerator.reduce(into: [URL]()) { partialResult, element in
                switch element {
                case let url as URL:
                    let attributes = try url.resourceValues(forKeys: [.isRegularFileKey])
                    if let isRegularFile = attributes.isRegularFile, isRegularFile {
                        let pathExtension = url.pathExtension.lowercased()
                        switch core {
                        case .cytrus:
                            if ["3ds", "3dsx", "app", "cci", "cxi"].contains(pathExtension) {
                                partialResult.append(url)
                            }
                        case .grape:
                            if ["gba", "nds"].contains(pathExtension) {
                                partialResult.append(url)
                            }
                        case .kiwi:
                            if ["nes"].contains(pathExtension) {
                                partialResult.append(url)
                            }
                        }
                    }
                default:
                    break
                }
            })
        }
        
        // TODO: Add cores to populate additional game information such as the icon, publisher, region, size and title
        func games(_ core: Core, _ urls: [URL]) {
            urls.forEach { url in
                guard let nameWithoutExtension = url.lastPathComponent.components(separatedBy: ".").first else {
                    return
                }
                
                switch core {
                case .cytrus:
                    cytrusManager.cytrus.add(.init(core: core, fileDetails: .init(extension: url.pathExtension.lowercased(), name: url.lastPathComponent,
                                                                                  nameWithoutExtension: nameWithoutExtension,
                                                                                  url: .documentsDirectory), title: ""))
                case .grape:
                    grapeManager.grape.add(.init(core: core, fileDetails: .init(extension: url.pathExtension.lowercased(), name: url.lastPathComponent,
                                                                                nameWithoutExtension: nameWithoutExtension,
                                                                                url: .documentsDirectory), title: ""))
                case .kiwi:
                    kiwiManager.kiwi.add(.init(core: core, fileDetails: .init(extension: url.pathExtension.lowercased(), name: url.lastPathComponent,
                                                                              nameWithoutExtension: nameWithoutExtension,
                                                                              url: .documentsDirectory), title: ""))
                }
            }
        }
        
        let cytrusCrawler = try crawler(.cytrus)
        games(cytrusCrawler.core, cytrusCrawler.urls)
        
        let grapeCrawler = try crawler(.grape)
        games(grapeCrawler.core, grapeCrawler.urls)
        
        let kiwiCrawler = try crawler(.kiwi)
        games(kiwiCrawler.core, kiwiCrawler.urls)
    }
}