import type { Project, Tool, Settings } from '../types';

const BASE = '/api';
const TOKEN_KEY = 'codedump_token';

function getToken(): string | null {
  return localStorage.getItem(TOKEN_KEY);
}

async function req<T>(path: string, options: RequestInit = {}): Promise<T> {
  const token = getToken();
  const headers: Record<string, string> = {
    ...(options.headers as Record<string, string> || {}),
  };
  if (token) headers['Authorization'] = `Bearer ${token}`;
  if (options.body && typeof options.body === 'string') headers['Content-Type'] = 'application/json';

  const res = await fetch(`${BASE}${path}`, { ...options, headers });

  if (res.status === 401) {
    // Token expired — clear storage and reload to login
    localStorage.removeItem(TOKEN_KEY);
    localStorage.removeItem('codedump_user');
    window.location.href = '/login';
    throw new Error('Session expired');
  }

  if (!res.ok) {
    const err = await res.json().catch(() => ({ error: res.statusText }));
    throw new Error(err.error || res.statusText);
  }
  if (res.status === 204) return undefined as T;
  return res.json();
}

// Auth
export const pinLogin = (pin: string) =>
  req<{ token: string; user: any }>('/auth/pin', { method: 'POST', body: JSON.stringify({ pin }) });
export const adminLogin = (username: string, password: string) =>
  req<{ token: string; user: any }>('/auth/login', { method: 'POST', body: JSON.stringify({ username, password }) });

// Users (admin only)
export const getUsers = () => req<any[]>('/users');
export const createUser = (data: any) =>
  req<any>('/users', { method: 'POST', body: JSON.stringify(data) });
export const updateUser = (id: string, data: any) =>
  req<any>(`/users/${id}`, { method: 'PUT', body: JSON.stringify(data) });
export const deleteUser = (id: string) => req<void>(`/users/${id}`, { method: 'DELETE' });

// Projects
export const getProjects = () => req<Project[]>('/projects');
export const getProject = (id: string) => req<Project>(`/projects/${id}`);
export const createProject = (data: Partial<Project>) =>
  req<Project>('/projects', { method: 'POST', body: JSON.stringify(data) });
export const updateProject = (id: string, data: Partial<Project>) =>
  req<Project>(`/projects/${id}`, { method: 'PUT', body: JSON.stringify(data) });
export const deleteProject = (id: string) => req<void>(`/projects/${id}`, { method: 'DELETE' });

// Tools
export const getTools = () => req<Tool[]>('/tools');
export const createTool = (data: Partial<Tool>) =>
  req<Tool>('/tools', { method: 'POST', body: JSON.stringify(data) });
export const updateTool = (id: string, data: Partial<Tool>) =>
  req<Tool>(`/tools/${id}`, { method: 'PUT', body: JSON.stringify(data) });
export const deleteTool = (id: string) => req<void>(`/tools/${id}`, { method: 'DELETE' });

// Uploads
export const uploadDocument = (projectId: string, file: File) => {
  const form = new FormData();
  form.append('file', file);
  const token = getToken();
  return fetch(`${BASE}/uploads/projects/${projectId}`, {
    method: 'POST',
    headers: token ? { Authorization: `Bearer ${token}` } : {},
    body: form,
  }).then((r) => r.json());
};
export const deleteDocument = (id: string) => req<void>(`/uploads/documents/${id}`, { method: 'DELETE' });
export const getFileUrl = (filename: string) => `${BASE}/uploads/${filename}`;

// Settings
export const getSettings = () => req<Settings>('/settings');
export const updateSettings = (data: Partial<Settings>) =>
  req<Settings>('/settings', { method: 'PUT', body: JSON.stringify(data) });
export const uploadLogo = (file: File) => {
  const form = new FormData();
  form.append('logo', file);
  const token = getToken();
  return fetch(`${BASE}/settings/logo`, {
    method: 'POST',
    headers: token ? { Authorization: `Bearer ${token}` } : {},
    body: form,
  }).then((r) => r.json());
};