package com.example.livestreaming;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;

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

import com.example.livestreaming.databinding.ActivityConversationBinding;

import java.util.ArrayList;
import java.util.List;

public class ConversationActivity extends AppCompatActivity {

    private static final String EXTRA_CONVERSATION_ID = "extra_conversation_id";
    private static final String EXTRA_CONVERSATION_TITLE = "extra_conversation_title";

    private ActivityConversationBinding binding;

    private ConversationMessagesAdapter adapter;
    private final List<ChatMessage> messages = new ArrayList<>();

    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);
    }

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

        String title = getIntent() != null ? getIntent().getStringExtra(EXTRA_CONVERSATION_TITLE) : null;
        binding.titleText.setText(title != null ? title : "会话");

        binding.backButton.setOnClickListener(v -> finish());

        setupMessages();
        setupInput();
    }

    private void setupMessages() {
        adapter = new ConversationMessagesAdapter();

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

        messages.clear();
        String title = binding.titleText.getText() != null ? binding.titleText.getText().toString() : "";
        messages.add(new ChatMessage(title, "你好～"));
        messages.add(new ChatMessage("我", "在的，有什么需要帮忙？"));
        adapter.submitList(new ArrayList<>(messages));
        scrollToBottom();
    }

    private void setupInput() {
        binding.sendButton.setOnClickListener(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();
        });
    }

    private void sendMessage() {
        String text = binding.messageInput.getText() != null ? binding.messageInput.getText().toString().trim() : "";
        if (TextUtils.isEmpty(text)) return;

        messages.add(new ChatMessage("我", text));
        adapter.submitList(new ArrayList<>(messages));
        binding.messageInput.setText("");
        scrollToBottom();
    }

    private void scrollToBottom() {
        if (messages.isEmpty()) return;
        binding.messagesRecyclerView.post(() -> binding.messagesRecyclerView.scrollToPosition(messages.size() - 1));
    }
}