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import SwiftUI
@MainActor
class BooruManager: ObservableObject {
@Published var posts: [BooruPost] = []
@Published var allTags: [BooruTag] = []
@Published var isLoading: Bool = false
@Published var currentPage: Int = 1
@Published var searchText = ""
@Published var endOfData: Bool = false
private var currentTask: Task<Void, Never>?
let provider: BooruProvider
var tags: [String] {
if searchText.isEmpty {
return []
}
return
searchText
.split(separator: " ")
.map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
.filter { !$0.isEmpty }
}
private var tagsCacheFileURL: URL? {
guard let directory = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first
else {
return nil
}
return directory.appendingPathComponent("\(provider)_tags.json")
}
#if os(macOS)
@Published var selectedPost: BooruPost?
#endif
init(_ provider: BooruProvider) {
self.provider = provider
loadCachedTags()
fetchAllTags()
}
func fetchPosts(page: Int = 1, limit: Int = 100, tags: [String] = [], replace: Bool = false) async
{
guard !isLoading else { return }
currentTask?.cancel()
currentTask = Task {
isLoading = true
defer { isLoading = false }
if replace {
self.posts = []
self.currentPage = 1
}
guard
let url = urlForPosts(
page: self.provider == .safebooru ? page - 1 : page, limit: limit, tags: tags
)
else {
return
}
do {
let (data, _) = try await URLSession.shared.data(from: url)
if Task.isCancelled { return }
DispatchQueue.main.async {
let newPosts = Array(Set(BooruPostXMLParser(data: data, provider: self.provider).parse()))
.sorted { lhs, rhs in
lhs.id > rhs.id
}
if newPosts.isEmpty {
self.endOfData = true
} else {
self.posts += Array(Set(newPosts))
}
}
} catch {
if (error as? URLError)?.code != .cancelled {
#if DEBUG
print("fetchPosts: \(error)")
#endif
}
}
}
}
func performSearch() {
currentTask?.cancel()
currentTask = Task {
await fetchPosts(page: 1, tags: tags, replace: true)
}
}
func loadNextPage() {
guard !isLoading else { return }
Task {
await fetchPosts(page: currentPage + 1, tags: tags)
DispatchQueue.main.async {
self.currentPage += 1
}
}
}
func fetchAllTags(limit: Int = 0) {
Task {
guard let url = urlForTags(limit: limit) else { return }
do {
let (data, _) = try await URLSession.shared.data(from: url)
if Task.isCancelled { return }
DispatchQueue.main.async {
self.allTags = BooruTagXMLParser(data: data).parse().sorted { $0.count > $1.count }
self.saveTagsToCache()
}
} catch {
if (error as? URLError)?.code != .cancelled {
#if DEBUG
print("fetchAllTags: \(error)")
#endif
}
}
}
}
private func moebooruURL(domain: String, page: Int, limit: Int, tagString: String) -> URL? {
URL(string: "https://\(domain)/post.xml?page=\(page)&limit=\(limit)&tags=\(tagString)")
}
private func gelbooruURL(domain: String, page: Int, limit: Int, tagString: String) -> URL? {
URL(
string:
"https://\(domain)/index.php?page=dapi&s=post&q=index&pid=\(page)&limit=\(limit)&tags=\(tagString)"
)
}
private func urlForPosts(page: Int, limit: Int, tags: [String]) -> URL? {
let tagString = tags.joined(separator: "+")
switch provider {
case .yandere:
return moebooruURL(domain: "yande.re", page: page, limit: limit, tagString: tagString)
case .konachan:
return moebooruURL(domain: "konachan.com", page: page, limit: limit, tagString: tagString)
case .sakugabooru:
return moebooruURL(domain: "sakugabooru.com", page: page, limit: limit, tagString: tagString)
case .safebooru:
return gelbooruURL(domain: "safebooru.org", page: page, limit: limit, tagString: tagString)
case .gelbooru:
return gelbooruURL(domain: "gelbooru.com", page: page, limit: limit, tagString: tagString)
}
}
private func urlForTags(limit: Int) -> URL? {
switch provider {
case .yandere:
URL(string: "https://yande.re/tag.xml?limit=\(limit)")
case .safebooru:
URL(string: "https://safebooru.org/index.php?page=dapi&s=tag&q=index&limit=\(limit)")
default:
nil
}
}
private func saveTagsToCache() {
guard let url = tagsCacheFileURL else { return }
do {
let data = try JSONEncoder().encode(allTags)
try data.write(to: url)
} catch {
#if DEBUG
print("saveTagsToCache: \(error)")
#endif
}
}
private func loadCachedTags() {
guard let url = tagsCacheFileURL else { return }
do {
let data = try Data(contentsOf: url)
let cachedTags = try JSONDecoder().decode([BooruTag].self, from: data)
DispatchQueue.main.async {
self.allTags = cachedTags
}
} catch {
#if DEBUG
print("loadCachedTags: \(error)")
#endif
}
}
deinit {
currentTask?.cancel()
}
}
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