package com.xuqm.sdk.im

import com.xuqm.sdk.XuqmLoginSession
import com.xuqm.sdk.XuqmSDK
import com.xuqm.sdk.core.ServiceEndpointRegistry
import com.xuqm.sdk.im.api.AddMemberRequest
import com.xuqm.sdk.im.api.CreateGroupRequest
import com.xuqm.sdk.im.api.ImApi
import com.xuqm.sdk.im.api.SetMutedRequest
import com.xuqm.sdk.im.api.SetPinnedRequest
import com.xuqm.sdk.im.api.UpdateGroupRequest
import com.xuqm.sdk.im.listener.ImEventListener
import com.xuqm.sdk.im.model.ImConnectionState
import com.xuqm.sdk.im.model.ConversationData
import com.xuqm.sdk.im.model.ImGroup
import com.xuqm.sdk.im.model.ImMessage
import com.xuqm.sdk.network.ApiClient
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow

object ImSDK {

    private var client: ImClient? = null
    private val api: ImApi get() = ApiClient.create(ImApi::class.java, ServiceEndpointRegistry.imApiBaseUrl)
    private val connectionListener = object : ImEventListener {
        override fun onConnected() {
            _connectionState.value = ImConnectionState.Connected
        }

        override fun onDisconnected(reason: String?) {
            _connectionState.value = ImConnectionState.Disconnected(reason)
        }

        override fun onError(error: String) {
            _connectionState.value = ImConnectionState.Disconnected(error)
        }
    }
    private val _connectionState = MutableStateFlow<ImConnectionState>(ImConnectionState.Disconnected("未连接"))
    val connectionState: StateFlow<ImConnectionState> = _connectionState

    var currentUserId: String = ""
        private set

    init {
        XuqmSDK.currentLoginSession?.let { onSdkLogin(it) }
    }

    suspend fun login(
        userId: String,
        userSig: String,
        nickname: String? = null,
        avatar: String? = null,
    ) = withContext(Dispatchers.IO) {
        XuqmSDK.requireInit()
        currentUserId = userId
        connectWithToken(userSig)
    }

    suspend fun loginWithUserSig(userId: String, userSig: String) =
        withContext(Dispatchers.IO) {
            XuqmSDK.requireInit()
            currentUserId = userId
            connectWithToken(userSig)
        }

    @Deprecated("Use loginWithUserSig(userId, userSig) instead.")
    suspend fun loginWithToken(userId: String, token: String) =
        loginWithUserSig(userId, token)

    fun sendMessage(toId: String, chatType: String, msgType: String, content: String) {
        client?.sendMessage(toId, chatType, msgType, content)
    }

    suspend fun fetchHistory(toId: String, page: Int = 0, size: Int = 20): List<ImMessage> =
        withContext(Dispatchers.IO) {
            api.fetchHistory(toId, XuqmSDK.appId, page, size).data ?: emptyList()
        }

    suspend fun fetchGroupHistory(groupId: String, page: Int = 0, size: Int = 20): List<ImMessage> =
        withContext(Dispatchers.IO) {
            api.fetchGroupHistory(groupId, XuqmSDK.appId, page, size).data ?: emptyList()
        }

    suspend fun listGroups(): List<ImGroup> =
        withContext(Dispatchers.IO) { api.listGroups(XuqmSDK.appId).data ?: emptyList() }

    suspend fun createGroup(name: String, memberIds: List<String>): ImGroup? =
        withContext(Dispatchers.IO) { api.createGroup(XuqmSDK.appId, CreateGroupRequest(name, memberIds)).data }

    suspend fun getGroupInfo(groupId: String): ImGroup? =
        withContext(Dispatchers.IO) { api.getGroupInfo(groupId).data }

    suspend fun updateGroupInfo(groupId: String, name: String? = null, announcement: String? = null) =
        withContext(Dispatchers.IO) { api.updateGroupInfo(groupId, UpdateGroupRequest(name, announcement)) }

    suspend fun addGroupMember(groupId: String, userId: String) =
        withContext(Dispatchers.IO) { api.addGroupMember(groupId, AddMemberRequest(userId)) }

    suspend fun removeGroupMember(groupId: String, userId: String) =
        withContext(Dispatchers.IO) { api.removeGroupMember(groupId, userId) }

    suspend fun leaveGroup(groupId: String) =
        withContext(Dispatchers.IO) { api.removeGroupMember(groupId, currentUserId) }

    suspend fun listFriends(): List<String> =
        withContext(Dispatchers.IO) { api.listFriends(XuqmSDK.appId).data ?: emptyList() }

    suspend fun addFriend(friendId: String) =
        withContext(Dispatchers.IO) { api.addFriend(XuqmSDK.appId, friendId) }

    suspend fun removeFriend(friendId: String) =
        withContext(Dispatchers.IO) { api.removeFriend(friendId, XuqmSDK.appId) }

    suspend fun listConversations(): List<ConversationData> =
        withContext(Dispatchers.IO) { api.listConversations(XuqmSDK.appId).data ?: emptyList() }

    suspend fun setConversationPinned(targetId: String, chatType: String, pinned: Boolean) =
        withContext(Dispatchers.IO) {
            api.setConversationPinned(targetId, chatType, SetPinnedRequest(pinned))
        }

    suspend fun setConversationMuted(targetId: String, chatType: String, muted: Boolean) =
        withContext(Dispatchers.IO) {
            api.setConversationMuted(targetId, chatType, SetMutedRequest(muted))
        }

    suspend fun markRead(targetId: String, chatType: String = "SINGLE") =
        withContext(Dispatchers.IO) { api.markRead(targetId, XuqmSDK.appId, chatType) }

    fun addListener(listener: ImEventListener) = client?.addListener(listener)
    fun removeListener(listener: ImEventListener) = client?.removeListener(listener)

    fun disconnect() {
        disconnectInternal(clearTokenStore = true)
    }

    fun onSdkLogin(session: XuqmLoginSession) {
        XuqmSDK.requireInit()
        currentUserId = session.userId
        connectWithToken(session.userSig)
    }

    fun onSdkLogout() {
        disconnectInternal(clearTokenStore = false)
    }

    private fun connectWithToken(token: String) {
        XuqmSDK.tokenStore.saveToken(token)
        client?.disconnect()
        _connectionState.value = ImConnectionState.Connecting
        client = ImClient(ServiceEndpointRegistry.imWsUrl, token, XuqmSDK.appId)
        client?.addListener(connectionListener)
        client?.connect()
    }

    private fun disconnectInternal(clearTokenStore: Boolean) {
        client?.disconnect()
        client = null
        currentUserId = ""
        _connectionState.value = ImConnectionState.Disconnected("已断开")
        if (clearTokenStore) {
            XuqmSDK.tokenStore.clear()
        }
    }
}