/**
 * DELETE /api/messages/:instanceId/:chatId
 * Delete a chat and all its related data (messages, etc.)
 */
import { query } from '../../../../utils/database'

export default defineEventHandler(async (event) => {
  const username = getHeader(event, 'x-authentik-username')
  if (!username) {
    throw createError({ statusCode: 401, message: 'Unauthorized' })
  }

  const instanceId = getRouterParam(event, 'instanceId')
  const chatId = getRouterParam(event, 'chatId')

  if (!instanceId) {
    throw createError({ statusCode: 400, message: 'Missing instanceId' })
  }

  if (!chatId) {
    throw createError({ statusCode: 400, message: 'Missing chatId' })
  }

  try {
    // First, get chat info for logging
    const chatResult = await query(
      `SELECT id, jid, name, alias FROM chats WHERE id = $1 AND instance_id = $2`,
      [chatId, instanceId]
    )

    if (chatResult.rows.length === 0) {
      throw createError({ statusCode: 404, message: 'Chat not found' })
    }

    const chat = chatResult.rows[0]

    // Count messages that will be deleted
    const messageCount = await query(
      `SELECT COUNT(*) as count FROM messages WHERE chat_id = $1`,
      [chatId]
    )

    // Delete the chat (messages will be deleted via CASCADE)
    await query(
      `DELETE FROM chats WHERE id = $1 AND instance_id = $2`,
      [chatId, instanceId]
    )

    console.log(`[Chat API] Deleted chat ${chat.jid} (${chat.name || chat.alias || 'unnamed'}) with ${messageCount.rows[0].count} messages`)

    return {
      success: true,
      deleted: {
        chatId: chat.id,
        jid: chat.jid,
        name: chat.name || chat.alias,
        messagesDeleted: parseInt(messageCount.rows[0].count)
      }
    }
  } catch (error: any) {
    console.error('[Chat API] Error deleting chat:', error)

    if (error.statusCode) {
      throw error
    }

    throw createError({
      statusCode: 500,
      message: error.message || 'Error deleting chat'
    })
  }
})