//
//  SDLSuperSession.swift
//  punchnet
//
//  Created by 安礼成 on 2026/5/27.
//
import Foundation

final class SDLSuperSession: @unchecked Sendable {
    typealias MessageHandler = @Sendable (SDLQUICInboundMessage) async -> Void

    private let serverEndpoint: SDLConfiguration.ResolvedServerEndpoint
    private let port: UInt16
    private let onMessage: MessageHandler
    private let client: SDLSuperClient

    init(serverEndpoint: SDLConfiguration.ResolvedServerEndpoint, port: UInt16, onMessage: @escaping MessageHandler) {
        self.serverEndpoint = serverEndpoint
        self.port = port
        self.onMessage = onMessage
        self.client = SDLSuperClient(serverEndpoint: serverEndpoint, port: port)
    }

    func run() async throws {
        do {
            try await self.runLoops()
            await self.stop()
        } catch {
            await self.stop()
            throw error
        }
    }

    func stop() async {
        await self.client.stop()
    }

    func send(type: SDLPacketType, data: Data) async {
        await self.client.send(type: type, data: data)
    }

    private func runLoops() async throws {
        SDLLogger.log("[SDLSuperSession] start super client: \(self.serverEndpoint.ip)")

        try await withThrowingTaskGroup(of: Void.self) { group in
            defer {
                group.cancelAll()
            }

            group.addTask {
                try await self.client.run()
            }

            group.addTask {
                try await self.readLoop()
            }

            group.addTask {
                try await self.pingLoop()
            }

            _ = try await group.next()
        }
    }

    private func readLoop() async throws {
        for try await message in self.client.messageStream {
            try Task.checkCancellation()
            await self.onMessage(message)
        }
    }

    private func pingLoop() async throws {
        while true {
            try await Task.sleep(for: .seconds(5))
            try Task.checkCancellation()
            await self.client.send(type: .ping, data: Data())
        }
    }
}