const API_BASE = import.meta.env.VITE_API_BASE_URL || '/api';

async function fetchAPI(endpoint, options = {}) {
  const response = await fetch(`${API_BASE}${endpoint}`, {
    headers: {
      'Content-Type': 'application/json',
      ...options.headers,
    },
    ...options,
  });

  if (!response.ok) {
    const error = await response.json().catch(() => ({ detail: 'Request failed' }));
    throw new Error(error.detail || `HTTP ${response.status}`);
  }

  if (response.status === 204) {
    return null;
  }

  return response.json();
}

// Projects
export const getProjects = (archived = null) => {
  const params = new URLSearchParams();
  if (archived !== null) {
    params.append('archived', archived);
  }
  const queryString = params.toString();
  return fetchAPI(`/projects${queryString ? `?${queryString}` : ''}`);
};
export const getProject = (id) => fetchAPI(`/projects/${id}`);
export const createProject = (data) => fetchAPI('/projects', {
  method: 'POST',
  body: JSON.stringify(data),
});
export const updateProject = (id, data) => fetchAPI(`/projects/${id}`, {
  method: 'PUT',
  body: JSON.stringify(data),
});
export const deleteProject = (id) => fetchAPI(`/projects/${id}`, { method: 'DELETE' });
export const archiveProject = (id) => updateProject(id, { is_archived: true });
export const unarchiveProject = (id) => updateProject(id, { is_archived: false });

// Tasks
export const getProjectTasks = (projectId) => fetchAPI(`/projects/${projectId}/tasks`);
export const getProjectTaskTree = (projectId) => fetchAPI(`/projects/${projectId}/tasks/tree`);
export const getTasksByStatus = (projectId, status) =>
  fetchAPI(`/projects/${projectId}/tasks/by-status/${status}`);

export const getTask = (id) => fetchAPI(`/tasks/${id}`);
export const createTask = (data) => fetchAPI('/tasks', {
  method: 'POST',
  body: JSON.stringify(data),
});
export const updateTask = (id, data) => fetchAPI(`/tasks/${id}`, {
  method: 'PUT',
  body: JSON.stringify(data),
});
export const deleteTask = (id) => fetchAPI(`/tasks/${id}`, { method: 'DELETE' });

// JSON Import
export const importJSON = (data) => fetchAPI('/import-json', {
  method: 'POST',
  body: JSON.stringify(data),
});

// Search
export const searchTasks = (query, projectIds = null) => {
  const params = new URLSearchParams({ query });
  if (projectIds && projectIds.length > 0) {
    params.append('project_ids', projectIds.join(','));
  }
  return fetchAPI(`/search?${params.toString()}`);
};