// Chat API Service
import { Chat, Message, Document } from '../types';

const API_BASE = '';

// Create a new chat
export async function createChat(title?: string): Promise<Chat> {
  const res = await fetch(`${API_BASE}/chats`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ title: title || 'New Chat' }),
  });
  
  if (!res.ok) {
    const data = await res.json();
    throw new Error(data.detail || 'Failed to create chat');
  }
  
  return res.json();
}

// Get all chats
export async function getChats(): Promise<Chat[]> {
  const res = await fetch(`${API_BASE}/chats`);
  
  if (!res.ok) {
    throw new Error('Failed to fetch chats');
  }
  
  const data = await res.json();
  return data.chats;
}

// Get messages for a chat
export async function getMessages(chatId: string): Promise<Message[]> {
  const res = await fetch(`${API_BASE}/chats/${chatId}/messages`);
  
  if (!res.ok) {
    throw new Error('Failed to fetch messages');
  }
  
  const data = await res.json();
  return data.messages;
}

// Send a message and get AI response
export async function sendMessage(chatId: string, content: string): Promise<{
  user_message: Message;
  assistant_message: Message;
}> {
  const res = await fetch(`${API_BASE}/chats/${chatId}/messages`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ content }),
  });
  
  if (!res.ok) {
    const data = await res.json();
    throw new Error(data.detail || 'Failed to send message');
  }
  
  return res.json();
}

// Delete a chat
export async function deleteChat(chatId: string): Promise<void> {
  const res = await fetch(`${API_BASE}/chats/${chatId}`, {
    method: 'DELETE',
  });
  
  if (!res.ok) {
    throw new Error('Failed to delete chat');
  }
}

// ==============================
// DOCUMENT API FUNCTIONS
// ==============================

// Get all documents
export async function getDocuments(): Promise<Document[]> {
  const res = await fetch(`${API_BASE}/documents`);
  
  if (!res.ok) {
    throw new Error('Failed to fetch documents');
  }
  
  const data = await res.json();
  return data.documents;
}

// Upload a document
export async function uploadDocument(file: File): Promise<Document> {
  const formData = new FormData();
  formData.append('file', file);

  const res = await fetch(`${API_BASE}/documents`, {
    method: 'POST',
    body: formData,
  });

  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    throw new Error(data.detail || 'Failed to upload document');
  }

  return res.json();
}

// Delete a document
export async function deleteDocument(docId: string): Promise<void> {
  const res = await fetch(`${API_BASE}/documents/${docId}`, {
    method: 'DELETE',
  });
  
  if (!res.ok) {
    throw new Error('Failed to delete document');
  }
}

// Legacy summarize function (backwards compatibility)
export async function summarizeText(text: string): Promise<string> {
  const res = await fetch(`${API_BASE}/ask`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ question: text }),
  });

  const data = await res.json();
  console.log("datalar", data);
  
  if (!res.ok) throw new Error(data.error || 'Unexpected error');

  return data.answer;
}