#if os(iOS)
import Foundation
import AVFoundation
import UIKit

/// iOS 录制器 — 录制本地文件，流媒体暂不支持（CBS 有 DRM 保护，需 ffmpeg iOS）
@MainActor
final class HLSRecorder: ObservableObject {
    @Published var isRecording = false
    @Published var durationText = "00:00"

    var onRecordingSaved: ((URL) -> Void)?
    var onError: ((String) -> Void)?

    private var recordTask: Task<Void, Never>?
    private var startTime: Date?
    private var timer: Timer?

    func startRecording(url: URL, player: AVPlayer) {
        guard !isRecording else { return }
        isRecording = true
        startTime = Date()

        timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] _ in
            Task { @MainActor in
                guard let self, let start = self.startTime else { return }
                let elapsed = Int(Date().timeIntervalSince(start))
                self.durationText = String(format: "%02d:%02d:%02d", elapsed / 3600, (elapsed % 3600) / 60, elapsed % 60)
            }
        }

        recordTask = Task { [weak self] in
            guard let self else { return }
            do {
                let outputURL: URL
                if url.isFileURL {
                    outputURL = try await self.copyLocalFile(url: url)
                } else {
                    // 流媒体：当前 iOS 不支持直接录制 HLS 流
                    // CBS 等有 DRM/CDN 保护，需 ffmpeg iOS 静态库
                    // 先用 URLSession 下载尝试（仅对无保护的 HTTP 流有效）
                    outputURL = try await self.downloadFile(url: url)
                }

                let attrs = try? FileManager.default.attributesOfItem(atPath: outputURL.path)
                let size = (attrs?[.size] as? Int64) ?? 0
                NSLog("[MiniPlayer] Recording complete: %@ (%lld bytes)", outputURL.path, size)

                await MainActor.run {
                    self.isRecording = false
                    self.timer?.invalidate()
                    if size > 1024 {
                        self.onRecordingSaved?(outputURL)
                    } else {
                        self.onError?("Recording too small (\(size) bytes) — stream may be DRM-protected. Try recording a local file.")
                        try? FileManager.default.removeItem(at: outputURL)
                    }
                }
            } catch {
                NSLog("[MiniPlayer] Recording error: %@", error.localizedDescription)
                await MainActor.run {
                    self.isRecording = false
                    self.timer?.invalidate()
                    self.onError?(error.localizedDescription)
                }
            }
        }
    }

    func stopRecording() {
        guard isRecording else { return }
        // 对于本地文件复制，立即完成；对于网络下载，取消任务
        recordTask?.cancel()
        isRecording = false
        timer?.invalidate()
    }

    // MARK: - 本地文件复制

    private func copyLocalFile(url: URL) async throws -> URL {
        let ext = url.pathExtension.isEmpty ? "mp4" : url.pathExtension
        let outputURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            .appendingPathComponent("MiniPlayer_Recording_\(Int(Date().timeIntervalSince1970)).\(ext)")

        if FileManager.default.fileExists(atPath: outputURL.path) {
            try FileManager.default.removeItem(at: outputURL)
        }
        try FileManager.default.copyItem(at: url, to: outputURL)
        return outputURL
    }

    // MARK: - 网络流下载（仅对无保护 HTTP 流有效）

    private func downloadFile(url: URL) async throws -> URL {
        let ext = url.pathExtension.isEmpty ? "mp4" : url.pathExtension
        let outputURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            .appendingPathComponent("MiniPlayer_Recording_\(Int(Date().timeIntervalSince1970)).\(ext)")

        if FileManager.default.fileExists(atPath: outputURL.path) {
            try FileManager.default.removeItem(at: outputURL)
        }

        let (tempURL, _) = try await URLSession.shared.download(from: url)
        try FileManager.default.moveItem(at: tempURL, to: outputURL)
        return outputURL
    }
}
#endif