/*
 * Atoll (DynamicIsland)
 * Copyright (C) 2024-2026 Atoll Contributors
 *
 * Originally from boring.notch project
 * Modified and adapted for Atoll (DynamicIsland)
 * See NOTICE for details.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

import Foundation
import Defaults

public protocol ImageServiceProtocol {
    func fetchImageData(from url: URL) async throws -> Data
}

public final class ImageService: ImageServiceProtocol {
    public static let shared = ImageService()

    private let session: URLSession

    private init() {
        let config = URLSessionConfiguration.default
        
        // Create proper cache directory path
        let cacheDir = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first!
        let artworkCachePath = cacheDir.appendingPathComponent("artwork_cache").path
        
        let cache = URLCache(memoryCapacity: 50 * 1024 * 1024, // 50MB
                             diskCapacity: 100 * 1024 * 1024, // 100MB
                             diskPath: artworkCachePath)
        config.urlCache = cache
        config.timeoutIntervalForRequest = 15
        config.timeoutIntervalForResource = 30
        config.httpShouldSetCookies = false
        self.session = URLSession(configuration: config)

        performLegacyCacheCleanupIfNeeded()
    }

    private func performLegacyCacheCleanupIfNeeded() {

        if !Defaults[.didClearLegacyURLCacheV1] {
            URLCache.shared.removeAllCachedResponses()
            Defaults[.didClearLegacyURLCacheV1] = true
        }
    }

    public func fetchImageData(from url: URL) async throws -> Data {
        guard let scheme = url.scheme?.lowercased(), scheme == "http" || scheme == "https" else {
            throw URLError(.unsupportedURL)
        }
        let (data, _) = try await session.data(from: url)
        return data
    }
}