import { NextRequest, NextResponse } from 'next/server';
import { db } from '@/lib/db';
import { requireAuth } from '@/lib/auth';
import { getErrorMessage } from '@/lib/errors';

// Send a message to a conversation
export async function POST(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const user = await requireAuth();
    if (!user) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    }

    const { id } = await params;
    const { content } = await request.json();

    if (!content || content.trim().length === 0) {
      return NextResponse.json({ error: 'Message content is required' }, { status: 400 });
    }

    // Verify user is participant
    const { rows: participants } = await db.query(
      'SELECT * FROM conversation_participants WHERE conversation_id = $1 AND user_id = $2',
      [id, user.id]
    );

    if (participants.length === 0) {
      return NextResponse.json({ error: 'Not authorized for this conversation' }, { status: 403 });
    }

    // Create message
    const { rows: msgRows } = await db.query(
      'INSERT INTO direct_messages (conversation_id, sender_id, content) VALUES ($1, $2, $3) RETURNING *',
      [id, user.id, content]
    );

    // Update conversation updated_at
    await db.query(
      'UPDATE conversations SET updated_at = NOW() WHERE id = $1',
      [id]
    );

    // Get sender info
    const { rows: userRows } = await db.query(
      'SELECT id, username, first_name, last_name, role FROM users WHERE id = $1',
      [user.id]
    );

    return NextResponse.json({
      message: {
        ...msgRows[0],
        sender_id: user.id,
        username: userRows[0].username,
        first_name: userRows[0].first_name,
        last_name: userRows[0].last_name,
        role: userRows[0].role
      }
    });
  } catch (error) {
    console.error('Send message error:', error);
    return NextResponse.json(
      { error: getErrorMessage(error, 'Failed to send message') },
      { status: 500 }
    );
  }
}