/*
 * Copyright (c) 2026 Meshtastic LLC
 *
 * 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/>.
 */
package com.geeksville.mesh.service

import com.geeksville.mesh.repository.radio.RadioInterfaceService
import io.mockk.every
import io.mockk.mockk
import io.mockk.verify
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.test.StandardTestDispatcher
import kotlinx.coroutines.test.TestScope
import kotlinx.coroutines.test.runTest
import org.junit.Before
import org.junit.Test
import org.meshtastic.core.data.repository.MeshLogRepository
import org.meshtastic.core.data.repository.PacketRepository
import org.meshtastic.core.service.ConnectionState
import org.meshtastic.proto.MeshProtos

class PacketHandlerTest {

    private val packetRepository: PacketRepository = mockk(relaxed = true)
    private val serviceBroadcasts: MeshServiceBroadcasts = mockk(relaxed = true)
    private val radioInterfaceService: RadioInterfaceService = mockk(relaxed = true)
    private val meshLogRepository: MeshLogRepository = mockk(relaxed = true)
    private val connectionStateHolder: ConnectionStateHandler = mockk(relaxed = true)

    private val testDispatcher = StandardTestDispatcher()
    private val testScope = TestScope(testDispatcher)

    private lateinit var handler: PacketHandler

    @Before
    fun setUp() {
        handler =
            PacketHandler(
                dagger.Lazy { packetRepository },
                serviceBroadcasts,
                radioInterfaceService,
                dagger.Lazy { meshLogRepository },
                connectionStateHolder,
            )
        handler.start(testScope)
    }

    @Test
    fun `sendToRadio with ToRadio Builder sends immediately`() {
        val builder =
            MeshProtos.ToRadio.newBuilder().apply { packet = MeshProtos.MeshPacket.newBuilder().setId(123).build() }

        handler.sendToRadio(builder)

        verify { radioInterfaceService.sendToRadio(any()) }
        // Verify broadcast status ENROUTE (via status mapping) is not directly testable easily without more mocks,
        // but we verify the call to radio service occurred.
    }

    @Test
    fun `sendToRadio with MeshPacket queues and sends when connected`() = runTest(testDispatcher) {
        val packet = MeshProtos.MeshPacket.newBuilder().setId(456).build()
        every { connectionStateHolder.connectionState } returns MutableStateFlow(ConnectionState.Connected)

        handler.sendToRadio(packet)
        testScheduler.runCurrent()

        verify { radioInterfaceService.sendToRadio(any()) }
    }

    @Test
    fun `handleQueueStatus completes deferred`() = runTest(testDispatcher) {
        val packet = MeshProtos.MeshPacket.newBuilder().setId(789).build()
        every { connectionStateHolder.connectionState } returns MutableStateFlow(ConnectionState.Connected)

        handler.sendToRadio(packet)
        testScheduler.runCurrent()

        val status =
            MeshProtos.QueueStatus.newBuilder()
                .apply {
                    meshPacketId = 789
                    res = 0 // Success
                    free = 1
                }
                .build()

        handler.handleQueueStatus(status)
        testScheduler.runCurrent()

        // If it completed, the queue job should move to the next packet or finish.
        // We can't easily check the deferred inside, but we can check if it cleared the internal wait.
    }
}