package com.example.livestreaming;

import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.PopupMenu;
import androidx.recyclerview.widget.LinearLayoutManager;

import com.example.livestreaming.databinding.ActivityConversationBinding;
import com.example.livestreaming.net.AuthStore;
import com.google.android.material.snackbar.Snackbar;

import org.json.JSONArray;
import org.json.JSONObject;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class ConversationActivity extends AppCompatActivity {

    private static final String TAG = "ConversationActivity";
    private static final String EXTRA_CONVERSATION_ID = "extra_conversation_id";
    private static final String EXTRA_CONVERSATION_TITLE = "extra_conversation_title";
    private static final String EXTRA_UNREAD_COUNT = "extra_unread_count";
    private static final int PAGE_SIZE = 20;
    private static final long POLL_INTERVAL = 3000; // 3秒轮询一次

    private ActivityConversationBinding binding;
    private final OkHttpClient httpClient = new OkHttpClient();

    private ConversationMessagesAdapter adapter;
    private final List<ChatMessage> messages = new ArrayList<>();
    private Handler handler;
    private Runnable pollRunnable;
    private boolean isPolling = false;

    private String conversationId;
    private int currentPage = 1;
    private int initialUnreadCount = 0;
    private String currentUserId;

    public static void start(Context context, String conversationId, String title) {
        Intent intent = new Intent(context, ConversationActivity.class);
        intent.putExtra(EXTRA_CONVERSATION_ID, conversationId);
        intent.putExtra(EXTRA_CONVERSATION_TITLE, title);
        context.startActivity(intent);
    }
    
    public static void start(Context context, String conversationId, String title, int otherUserId) {
        Intent intent = new Intent(context, ConversationActivity.class);
        intent.putExtra(EXTRA_CONVERSATION_ID, conversationId);
        intent.putExtra(EXTRA_CONVERSATION_TITLE, title);
        intent.putExtra("other_user_id", otherUserId);
        context.startActivity(intent);
    }

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityConversationBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        handler = new Handler(Looper.getMainLooper());

        String title = getIntent() != null ? getIntent().getStringExtra(EXTRA_CONVERSATION_TITLE) : null;
        binding.titleText.setText(title != null ? title : "会话");
        
        conversationId = getIntent() != null ? getIntent().getStringExtra(EXTRA_CONVERSATION_ID) : null;
        initialUnreadCount = getIntent() != null ? getIntent().getIntExtra(EXTRA_UNREAD_COUNT, 0) : 0;
        
        // 先尝试从 AuthStore 获取 userId
        currentUserId = AuthStore.getUserId(this);
        Log.d(TAG, "从AuthStore获取的用户ID: " + currentUserId);
        
        // 如果 userId 为空，尝试从用户信息接口获取
        if (currentUserId == null || currentUserId.isEmpty()) {
            fetchCurrentUserId();
        }

        binding.backButton.setOnClickListener(new DebounceClickListener() {
            @Override
            public void onDebouncedClick(View v) {
                finish();
            }
        });

        setupMessages();
        setupInput();
        
        // 标记会话为已读
        if (initialUnreadCount > 0 && conversationId != null) {
            markConversationAsRead();
        }
    }
    
    @Override
    protected void onPause() {
        super.onPause();
        stopPolling();
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        startPolling();
    }
    
    /**
     * 开始轮询新消息
     */
    private void startPolling() {
        if (isPolling) return;
        isPolling = true;
        
        pollRunnable = new Runnable() {
            @Override
            public void run() {
                if (!isPolling || isFinishing() || isDestroyed()) return;
                loadMessagesFromServer();
                handler.postDelayed(this, POLL_INTERVAL);
            }
        };
        // 延迟开始轮询，避免和初始加载冲突
        handler.postDelayed(pollRunnable, POLL_INTERVAL);
    }
    
    /**
     * 停止轮询
     */
    private void stopPolling() {
        isPolling = false;
        if (pollRunnable != null && handler != null) {
            handler.removeCallbacks(pollRunnable);
        }
    }

    private void setupMessages() {
        adapter = new ConversationMessagesAdapter();
        adapter.setOnMessageLongClickListener((message, position, view) -> {
            showMessageMenu(message, position, view);
        });

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setStackFromEnd(false);
        binding.messagesRecyclerView.setLayoutManager(layoutManager);
        binding.messagesRecyclerView.setAdapter(adapter);

        loadMessagesFromServer();
    }


    /**
     * 从服务器获取当前用户ID
     */
    private void fetchCurrentUserId() {
        String token = AuthStore.getToken(this);
        if (token == null) {
            Log.w(TAG, "未登录，无法获取用户ID");
            return;
        }

        String url = ApiConfig.getBaseUrl() + "/api/front/user/info";
        Log.d(TAG, "获取用户信息: " + url);

        Request request = new Request.Builder()
                .url(url)
                .addHeader("Authori-zation", token)
                .get()
                .build();

        httpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e(TAG, "获取用户信息失败", e);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String body = response.body() != null ? response.body().string() : "";
                Log.d(TAG, "用户信息响应: " + body);
                try {
                    JSONObject json = new JSONObject(body);
                    if (json.optInt("code", -1) == 200) {
                        JSONObject data = json.optJSONObject("data");
                        if (data != null) {
                            int uid = data.optInt("uid", 0);
                            if (uid > 0) {
                                currentUserId = String.valueOf(uid);
                                // 保存到 AuthStore
                                AuthStore.setUserInfo(ConversationActivity.this, currentUserId, data.optString("nickname", ""));
                                Log.d(TAG, "从服务器获取到用户ID: " + currentUserId);
                                // 重新加载消息以正确显示
                                runOnUiThread(() -> loadMessagesFromServer());
                            }
                        }
                    }
                } catch (Exception e) {
                    Log.e(TAG, "解析用户信息失败", e);
                }
            }
        });
    }

    /**
     * 从服务器加载消息列表
     */
    private void loadMessagesFromServer() {
        String token = AuthStore.getToken(this);
        if (token == null || conversationId == null) {
            Log.w(TAG, "未登录或会话ID为空");
            return;
        }

        String url = ApiConfig.getBaseUrl() + "/api/front/conversations/" + conversationId + "/messages?page=" + currentPage + "&pageSize=" + PAGE_SIZE;
        Log.d(TAG, "加载消息列表: " + url);

        Request request = new Request.Builder()
                .url(url)
                .addHeader("Authori-zation", token)
                .get()
                .build();

        httpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e(TAG, "加载消息列表失败", e);
                runOnUiThread(() -> Snackbar.make(binding.getRoot(), "加载消息失败", Snackbar.LENGTH_SHORT).show());
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String body = response.body() != null ? response.body().string() : "";
                Log.d(TAG, "消息列表响应: " + body);
                runOnUiThread(() -> parseMessages(body));
            }
        });
    }

    private void parseMessages(String body) {
        try {
            JSONObject json = new JSONObject(body);
            if (json.optInt("code", -1) == 200) {
                JSONArray data = json.optJSONArray("data");
                messages.clear();
                if (data != null) {
                    for (int i = 0; i < data.length(); i++) {
                        JSONObject item = data.getJSONObject(i);
                        ChatMessage msg = parseChatMessage(item);
                        if (msg != null) {
                            messages.add(msg);
                        }
                    }
                }
                // 消息按时间倒序返回，需要反转为正序显示
                Collections.reverse(messages);
                adapter.submitList(new ArrayList<>(messages));
                scrollToBottom();
            } else {
                String msg = json.optString("message", "加载失败");
                Snackbar.make(binding.getRoot(), msg, Snackbar.LENGTH_SHORT).show();
            }
        } catch (Exception e) {
            Log.e(TAG, "解析消息列表失败", e);
        }
    }

    private ChatMessage parseChatMessage(JSONObject item) {
        try {
            String messageId = item.optString("messageId", "");
            int senderId = item.optInt("userId", 0);  // 后端返回的 userId 实际是 senderId
            String username = item.optString("username", "未知用户");
            String message = item.optString("message", "");
            long timestamp = item.optLong("timestamp", System.currentTimeMillis());
            String status = item.optString("status", "sent");
            String avatarUrl = item.optString("avatarUrl", "");
            boolean isSystem = item.optBoolean("isSystemMessage", false);

            // 判断是否是自己发送的消息
            // 每次都重新从 AuthStore 获取最新的 userId，确保登录后能正确获取
            String myUserId = AuthStore.getUserId(this);
            if (myUserId == null || myUserId.isEmpty()) {
                myUserId = currentUserId;
            } else {
                currentUserId = myUserId;  // 同步更新
            }
            
            boolean isMine = false;
            if (myUserId != null && !myUserId.isEmpty() && senderId > 0) {
                isMine = myUserId.equals(String.valueOf(senderId));
            }
            Log.d(TAG, "消息判断: myUserId=" + myUserId + ", senderId=" + senderId + ", isMine=" + isMine);
            
            String displayName = isMine ? "我" : username;

            ChatMessage.MessageStatus msgStatus;
            switch (status) {
                case "sending":
                    msgStatus = ChatMessage.MessageStatus.SENDING;
                    break;
                case "read":
                    msgStatus = ChatMessage.MessageStatus.READ;
                    break;
                default:
                    msgStatus = ChatMessage.MessageStatus.SENT;
            }

            ChatMessage chatMessage = new ChatMessage(messageId, displayName, message, timestamp, isSystem, msgStatus);
            chatMessage.setAvatarUrl(avatarUrl);
            return chatMessage;
        } catch (Exception e) {
            Log.e(TAG, "解析消息失败", e);
            return null;
        }
    }


    /**
     * 标记会话为已读
     */
    private void markConversationAsRead() {
        String token = AuthStore.getToken(this);
        if (token == null || conversationId == null) return;

        String url = ApiConfig.getBaseUrl() + "/api/front/conversations/" + conversationId + "/read";
        Log.d(TAG, "标记已读: " + url);

        Request request = new Request.Builder()
                .url(url)
                .addHeader("Authori-zation", token)
                .post(RequestBody.create("", MediaType.parse("application/json")))
                .build();

        httpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e(TAG, "标记已读失败", e);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String body = response.body() != null ? response.body().string() : "";
                Log.d(TAG, "标记已读响应: " + body);
                runOnUiThread(() -> {
                    if (initialUnreadCount > 0) {
                        UnreadMessageManager.decrementUnreadCount(ConversationActivity.this, initialUnreadCount);
                    }
                });
            }
        });
    }

    private void showMessageMenu(ChatMessage message, int position, View anchorView) {
        PopupMenu popupMenu = new PopupMenu(this, anchorView);
        popupMenu.getMenu().add(0, 0, 0, "复制");
        // 只有自己发送的消息才能删除
        if ("我".equals(message.getUsername())) {
            popupMenu.getMenu().add(0, 1, 0, "删除");
        }
        
        popupMenu.setOnMenuItemClickListener(item -> {
            if (item.getItemId() == 0) {
                copyMessage(message);
                return true;
            } else if (item.getItemId() == 1) {
                deleteMessage(message, position);
                return true;
            }
            return false;
        });
        
        popupMenu.show();
    }
    
    private void copyMessage(ChatMessage message) {
        ClipboardManager clipboard = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
        ClipData clip = ClipData.newPlainText("消息", message.getMessage());
        clipboard.setPrimaryClip(clip);
        Snackbar.make(binding.getRoot(), "已复制到剪贴板", Snackbar.LENGTH_SHORT).show();
    }
    
    private void deleteMessage(ChatMessage message, int position) {
        if (position < 0 || position >= messages.size()) return;
        
        new AlertDialog.Builder(this)
                .setTitle("删除消息")
                .setMessage("确定要删除这条消息吗？")
                .setPositiveButton("删除", (dialog, which) -> deleteMessageFromServer(message, position))
                .setNegativeButton("取消", null)
                .show();
    }

    private void deleteMessageFromServer(ChatMessage message, int position) {
        String token = AuthStore.getToken(this);
        if (token == null) return;

        String messageId = message.getMessageId();
        String url = ApiConfig.getBaseUrl() + "/api/front/conversations/messages/" + messageId;
        Log.d(TAG, "删除消息: " + url);

        Request request = new Request.Builder()
                .url(url)
                .addHeader("Authori-zation", token)
                .delete()
                .build();

        httpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e(TAG, "删除消息失败", e);
                runOnUiThread(() -> Snackbar.make(binding.getRoot(), "删除失败", Snackbar.LENGTH_SHORT).show());
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String body = response.body() != null ? response.body().string() : "";
                Log.d(TAG, "删除消息响应: " + body);
                runOnUiThread(() -> {
                    try {
                        JSONObject json = new JSONObject(body);
                        if (json.optInt("code", -1) == 200) {
                            messages.remove(position);
                            adapter.submitList(new ArrayList<>(messages));
                            Snackbar.make(binding.getRoot(), "消息已删除", Snackbar.LENGTH_SHORT).show();
                        } else {
                            Snackbar.make(binding.getRoot(), json.optString("message", "删除失败"), Snackbar.LENGTH_SHORT).show();
                        }
                    } catch (Exception e) {
                        Log.e(TAG, "解析删除响应失败", e);
                    }
                });
            }
        });
    }


    private void setupInput() {
        binding.sendButton.setOnClickListener(new DebounceClickListener(300) {
            @Override
            public void onDebouncedClick(View v) {
                sendMessage();
            }
        });

        binding.messageInput.setOnEditorActionListener((v, actionId, event) -> {
            if (event != null && event.getKeyCode() == KeyEvent.KEYCODE_ENTER) {
                sendMessage();
                return true;
            }
            return false;
        });

        binding.messageInput.setOnFocusChangeListener((v, hasFocus) -> {
            if (hasFocus) scrollToBottom();
        });
        
        // 设置通话按钮点击事件
        setupCallButtons();
    }
    
    /**
     * 设置通话按钮
     */
    private void setupCallButtons() {
        // 语音通话按钮
        binding.voiceCallButton.setOnClickListener(new DebounceClickListener() {
            @Override
            public void onDebouncedClick(View v) {
                initiateCall("voice");
            }
        });
        
        // 视频通话按钮
        binding.videoCallButton.setOnClickListener(new DebounceClickListener() {
            @Override
            public void onDebouncedClick(View v) {
                initiateCall("video");
            }
        });
    }
    
    /**
     * 发起通话
     */
    private void initiateCall(String callType) {
        if (!AuthHelper.requireLoginWithToast(this, "发起通话需要登录")) {
            return;
        }
        
        // 获取对方用户ID（从会话中解析）
        int otherUserId = getOtherUserIdFromConversation();
        if (otherUserId <= 0) {
            // 如果无法从Intent获取，尝试从服务器获取
            fetchOtherUserIdFromServer(callType);
            return;
        }
        
        startCallWithUserId(otherUserId, callType);
    }
    
    /**
     * 使用指定的用户ID发起通话
     */
    private void startCallWithUserId(int otherUserId, String callType) {
        String callTypeText = "voice".equals(callType) ? "语音" : "视频";
        Log.d(TAG, "发起" + callTypeText + "通话，对方用户ID: " + otherUserId);
        
        // 使用CallManager发起通话
        com.example.livestreaming.call.CallManager callManager = 
                com.example.livestreaming.call.CallManager.getInstance(this);
        
        // 先连接信令服务器
        if (currentUserId != null && !currentUserId.isEmpty()) {
            try {
                int myUserId = (int) Double.parseDouble(currentUserId);
                callManager.connect(myUserId);
            } catch (NumberFormatException e) {
                Log.e(TAG, "解析用户ID失败", e);
            }
        }
        
        // 发起通话
        callManager.initiateCall(otherUserId, callType, 
                new com.example.livestreaming.call.CallManager.CallCallback() {
            @Override
            public void onSuccess(com.example.livestreaming.call.InitiateCallResponse response) {
                Log.d(TAG, "通话发起成功: " + response.getCallId());
            }

            @Override
            public void onError(String error) {
                runOnUiThread(() -> {
                    Snackbar.make(binding.getRoot(), "呼叫失败: " + error, Snackbar.LENGTH_SHORT).show();
                });
            }
        });
    }
    
    /**
     * 从会话信息中获取对方用户ID
     */
    private int getOtherUserIdFromConversation() {
        // 尝试从Intent中获取
        int otherUserId = getIntent().getIntExtra("other_user_id", 0);
        if (otherUserId > 0) {
            Log.d(TAG, "从Intent获取到对方用户ID: " + otherUserId);
            return otherUserId;
        }
        
        // 如果Intent中没有，尝试从服务器获取会话详情
        Log.w(TAG, "Intent中没有other_user_id，需要从服务器获取");
        return 0;
    }
    
    /**
     * 从服务器获取会话详情以获取对方用户ID
     */
    private void fetchOtherUserIdFromServer(String callType) {
        String token = AuthStore.getToken(this);
        if (token == null || conversationId == null) {
            Snackbar.make(binding.getRoot(), "无法获取对方用户信息", Snackbar.LENGTH_SHORT).show();
            return;
        }

        String url = ApiConfig.getBaseUrl() + "/api/front/conversations/" + conversationId;
        Log.d(TAG, "获取会话详情: " + url);

        Request request = new Request.Builder()
                .url(url)
                .addHeader("Authori-zation", token)
                .get()
                .build();

        httpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e(TAG, "获取会话详情失败", e);
                runOnUiThread(() -> Snackbar.make(binding.getRoot(), "无法获取对方用户信息", Snackbar.LENGTH_SHORT).show());
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String body = response.body() != null ? response.body().string() : "";
                Log.d(TAG, "会话详情响应: " + body);
                runOnUiThread(() -> {
                    try {
                        JSONObject json = new JSONObject(body);
                        if (json.optInt("code", -1) == 200) {
                            JSONObject data = json.optJSONObject("data");
                            if (data != null) {
                                int otherUserId = data.optInt("otherUserId", 0);
                                if (otherUserId > 0) {
                                    Log.d(TAG, "从服务器获取到对方用户ID: " + otherUserId);
                                    startCallWithUserId(otherUserId, callType);
                                } else {
                                    Snackbar.make(binding.getRoot(), "无法获取对方用户信息", Snackbar.LENGTH_SHORT).show();
                                }
                            }
                        } else {
                            Snackbar.make(binding.getRoot(), "无法获取对方用户信息", Snackbar.LENGTH_SHORT).show();
                        }
                    } catch (Exception e) {
                        Log.e(TAG, "解析会话详情失败", e);
                        Snackbar.make(binding.getRoot(), "无法获取对方用户信息", Snackbar.LENGTH_SHORT).show();
                    }
                });
            }
        });
    }

    private void sendMessage() {
        if (!AuthHelper.requireLoginWithToast(this, "发送私信需要登录")) {
            return;
        }
        
        String text = binding.messageInput.getText() != null ? binding.messageInput.getText().toString().trim() : "";
        if (TextUtils.isEmpty(text)) return;
        if (conversationId == null) {
            Snackbar.make(binding.getRoot(), "会话ID无效", Snackbar.LENGTH_SHORT).show();
            return;
        }

        // 先在本地显示消息（发送中状态）
        ChatMessage newMessage = new ChatMessage("我", text);
        newMessage.setStatus(ChatMessage.MessageStatus.SENDING);
        messages.add(newMessage);
        adapter.submitList(new ArrayList<>(messages));
        binding.messageInput.setText("");
        scrollToBottom();

        // 发送到服务器
        sendMessageToServer(text, newMessage);
    }

    private void sendMessageToServer(String text, ChatMessage localMessage) {
        String token = AuthStore.getToken(this);
        if (token == null) return;

        String url = ApiConfig.getBaseUrl() + "/api/front/conversations/" + conversationId + "/messages";
        Log.d(TAG, "发送消息: " + url);

        try {
            JSONObject body = new JSONObject();
            body.put("message", text);
            body.put("messageType", "text");

            Request request = new Request.Builder()
                    .url(url)
                    .addHeader("Authori-zation", token)
                    .post(RequestBody.create(body.toString(), MediaType.parse("application/json")))
                    .build();

            httpClient.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                    Log.e(TAG, "发送消息失败", e);
                    runOnUiThread(() -> {
                        Snackbar.make(binding.getRoot(), "发送失败", Snackbar.LENGTH_SHORT).show();
                        // 移除发送失败的消息
                        messages.remove(localMessage);
                        adapter.submitList(new ArrayList<>(messages));
                    });
                }

                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    String responseBody = response.body() != null ? response.body().string() : "";
                    Log.d(TAG, "发送消息响应: " + responseBody);
                    runOnUiThread(() -> handleSendResponse(responseBody, localMessage));
                }
            });
        } catch (Exception e) {
            Log.e(TAG, "构建请求失败", e);
        }
    }

    private void handleSendResponse(String responseBody, ChatMessage localMessage) {
        try {
            JSONObject json = new JSONObject(responseBody);
            if (json.optInt("code", -1) == 200) {
                JSONObject data = json.optJSONObject("data");
                if (data != null) {
                    // 更新本地消息的ID和状态
                    localMessage.setMessageId(data.optString("messageId", localMessage.getMessageId()));
                    localMessage.setStatus(ChatMessage.MessageStatus.SENT);
                    adapter.notifyItemChanged(messages.indexOf(localMessage));
                }
            } else {
                String msg = json.optString("message", "发送失败");
                Snackbar.make(binding.getRoot(), msg, Snackbar.LENGTH_SHORT).show();
                messages.remove(localMessage);
                adapter.submitList(new ArrayList<>(messages));
            }
        } catch (Exception e) {
            Log.e(TAG, "解析发送响应失败", e);
        }
    }

    private void scrollToBottom() {
        if (messages.isEmpty()) return;
        binding.messagesRecyclerView.post(() -> {
            int lastPosition = messages.size() - 1;
            if (lastPosition >= 0) {
                binding.messagesRecyclerView.smoothScrollToPosition(lastPosition);
            }
        });
    }
    
    @Override
    protected void onDestroy() {
        super.onDestroy();
        stopPolling();
        handler = null;
    }
}