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import SwiftUI
@MainActor
class BooruManager: ObservableObject {
// MARK: - Published Properties
@Published var posts: [BooruPost] = []
@Published var allTags: [BooruTag] = []
@Published var isLoading = false
@Published var currentPage = 1
@Published var searchText = ""
@Published var endOfData = false
@Published var cacheSize: String?
@Published var selectedPost: BooruPost?
@Published var flavor: BooruProviderFlavor
@Published var domain: String
@Published private(set) var postIndexMap: [String: Int] = [:]
@Published var provider: BooruProvider
// MARK: - Private Properties
private var currentTask: Task<Void, Never>?
private let tagsCacheFileURL: URL? = FileManager.default.urls(
for: .cachesDirectory, in: .userDomainMask
).first?
.appendingPathComponent("\(BooruProvider.safebooru.asFileNameComponent)_tags.json")
private let pageCache = NSCache<NSString, BooruPageCacheEntry>() // swiftlint:disable:this legacy_objc_type
private let cacheDuration: TimeInterval = 300
// MARK: - Computed Properties
var tags: [String] {
searchText.isEmpty
? []
: searchText
.split(separator: " ")
.map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
.filter { !$0.isEmpty }
}
// MARK: - Initialization
init(_ provider: BooruProvider) {
self.provider = provider
self.flavor = BooruProviderFlavor(provider: provider)
self.domain = provider.domain
pageCache.countLimit = 50
pageCache.totalCostLimit = 50 * 1_024 * 1_024
}
// MARK: - Public Methods
func initializeTags() {
loadCachedTags()
fetchAllTags()
updateTagsCacheSize()
}
func fetchPosts(page: Int = 1, limit: Int = 100, tags: [String] = [], replace: Bool = false) async
{
guard !isLoading,
let url = urlForPosts(page: flavor == .gelbooru ? page - 1 : page, limit: limit, tags: tags)
else { return }
let cacheKey = "\(url.absoluteString)_\(replace)" as NSString // swiftlint:disable:this legacy_objc_type
if let cachedEntry = pageCache.object(forKey: cacheKey),
!cachedEntry.isExpired
{
isLoading = true
defer { isLoading = false }
updatePosts(cachedEntry.posts, replace: replace)
return
}
isLoading = true
currentTask?.cancel()
currentTask = Task {
defer { isLoading = false }
do {
let (data, _) = try await URLSession.shared.data(from: url)
guard !Task.isCancelled else { return }
let newPosts = parsePosts(from: data).sorted { $0.id > $1.id }
let cacheEntry = BooruPageCacheEntry(posts: newPosts, timestamp: Date())
pageCache.setObject(cacheEntry, forKey: cacheKey)
updatePosts(newPosts, replace: replace)
} catch {
if (error as? URLError)?.code != .cancelled { debugPrint("fetchPosts: \(error)") }
}
}
}
func clearPageCache() {
pageCache.removeAllObjects()
}
func performSearch(settings: SettingsManager? = nil) {
settings?.appendToSearchHistory(
BooruSearchQuery(provider: settings!.preferredBooru, tags: tags, searchedAt: Date())
)
currentTask?.cancel()
Task { await fetchPosts(page: 1, tags: tags, replace: true) }
}
func loadNextPage() {
guard !isLoading else { return }
Task {
await fetchPosts(page: currentPage + 1, tags: tags)
currentPage += 1
}
}
func fetchAllTags(limit: Int = 0) {
guard let url = urlForTags(limit: limit) else { return }
Task {
do {
let (data, _) = try await URLSession.shared.data(from: url)
guard !Task.isCancelled else { return }
allTags = BooruTagXMLParser(data: data).parse().sorted { $0.count > $1.count }
saveTagsToCache()
} catch {
if (error as? URLError)?.code != .cancelled { debugPrint("fetchAllTags: \(error)") }
}
}
}
func clearCachedTags() {
try? tagsCacheFileURL.map { url in
try FileManager.default.removeItem(at: url)
updateTagsCacheSize()
}
}
// MARK: - Private Helpers
private func urlForPosts(page: Int, limit: Int, tags: [String]) -> URL? {
let tagString = tags.joined(separator: "+")
switch flavor {
case .danbooru:
return URL(string: "https://\(domain)/posts.json?page=\(page)&tags=\(tagString)")
case .moebooru:
return URL(string: "https://\(domain)/post.xml?page=\(page)&limit=\(limit)&tags=\(tagString)")
case .gelbooru:
return URL(
string:
"https://\(domain)/index.php?page=dapi&s=post&q=index&pid=\(page)&limit=\(limit)&tags=\(tagString)"
)
}
}
private func urlForTags(limit: Int) -> URL? {
switch flavor {
case .moebooru:
return URL(string: "https://\(domain)/tag.xml?limit=\(limit)")
case .gelbooru:
return URL(string: "https://\(domain)/index.php?page=dapi&s=tag&q=index&limit=\(limit)")
case .danbooru:
return nil
}
}
private func parsePosts(from data: Data) -> [BooruPost] {
Array(
Set(
flavor == .danbooru
? DanbooruPostParser(data: data).parse()
: BooruPostXMLParser(data: data, provider: provider).parse()
)
)
}
private func updatePosts(_ newPosts: [BooruPost], replace: Bool) {
if replace {
posts = []
currentPage = 1
}
endOfData = newPosts.isEmpty
if !endOfData {
posts = (posts + newPosts).sorted { $0.id > $1.id }
postIndexMap.merge(
Dictionary(uniqueKeysWithValues: newPosts.enumerated().map { ($0.element.id, $0.offset) })
) { _, new in new }
}
}
private func saveTagsToCache() {
try? tagsCacheFileURL.map { url in
try JSONEncoder().encode(allTags).write(to: url)
updateTagsCacheSize()
}
}
private func loadCachedTags() {
guard let url = tagsCacheFileURL else { return }
if let data = try? Data(contentsOf: url),
let tags = try? JSONDecoder().decode([BooruTag].self, from: data)
{
allTags = tags
updateTagsCacheSize()
}
}
func updateTagsCacheSize() {
cacheSize = tagsCacheFileURL.flatMap { url in
ByteCountFormatter.string(
fromByteCount: Int64(
(try? FileManager.default.attributesOfItem(atPath: url.path)[.size] as? Int) ?? 0
),
countStyle: .file
)
}
}
deinit { currentTask?.cancel() }
}
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