/**
 * Shinkan Jinkendo API Client
 *
 * Zentrale API-Kommunikation mit automatischer Token-Injektion
 */

const API_URL = import.meta.env.VITE_API_URL || ''

/**
 * Generic API request with automatic token injection
 */
async function request(endpoint, options = {}) {
  const token = localStorage.getItem('authToken')

  const headers = {
    'Content-Type': 'application/json',
    ...options.headers
  }

  if (token) {
    headers['X-Auth-Token'] = token
  }

  const response = await fetch(`${API_URL}${endpoint}`, {
    ...options,
    headers
  })

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

  return response.json()
}

// ============================================================================
// Auth
// ============================================================================

export async function login(email, password) {
  return request('/api/auth/login', {
    method: 'POST',
    body: JSON.stringify({ email, password })
  })
}

export async function register(email, password, name) {
  return request('/api/auth/register', {
    method: 'POST',
    body: JSON.stringify({ email, password, name })
  })
}

export async function logout() {
  return request('/api/auth/logout', { method: 'POST' })
}

export async function getCurrentProfile() {
  return request('/api/profiles/me')
}

// ============================================================================
// Clubs & Groups
// ============================================================================

export async function listClubs() {
  return request('/api/clubs')
}

export async function getClub(id) {
  return request(`/api/clubs/${id}`)
}

export async function createClub(data) {
  return request('/api/clubs', {
    method: 'POST',
    body: JSON.stringify(data)
  })
}

export async function updateClub(id, data) {
  return request(`/api/clubs/${id}`, {
    method: 'PUT',
    body: JSON.stringify(data)
  })
}

export async function deleteClub(id) {
  return request(`/api/clubs/${id}`, { method: 'DELETE' })
}

export async function listDivisions(clubId) {
  const query = clubId ? `?club_id=${clubId}` : ''
  return request(`/api/divisions${query}`)
}

export async function createDivision(data) {
  return request('/api/divisions', {
    method: 'POST',
    body: JSON.stringify(data)
  })
}

export async function updateDivision(id, data) {
  return request(`/api/divisions/${id}`, {
    method: 'PUT',
    body: JSON.stringify(data)
  })
}

export async function deleteDivision(id) {
  return request(`/api/divisions/${id}`, { method: 'DELETE' })
}

export async function listTrainingGroups(filters = {}) {
  const query = new URLSearchParams(filters).toString()
  return request(`/api/groups${query ? '?' + query : ''}`)
}

export async function getTrainingGroup(id) {
  return request(`/api/groups/${id}`)
}

export async function createTrainingGroup(data) {
  return request('/api/groups', {
    method: 'POST',
    body: JSON.stringify(data)
  })
}

export async function updateTrainingGroup(id, data) {
  return request(`/api/groups/${id}`, {
    method: 'PUT',
    body: JSON.stringify(data)
  })
}

export async function deleteTrainingGroup(id) {
  return request(`/api/groups/${id}`, { method: 'DELETE' })
}

// ============================================================================
// Skills & Methods
// ============================================================================

export async function listSkills() {
  return request('/api/skills')
}

export async function createSkill(data) {
  return request('/api/skills', {
    method: 'POST',
    body: JSON.stringify(data)
  })
}

export async function listMethods() {
  return request('/api/methods')
}

export async function createMethod(data) {
  return request('/api/methods', {
    method: 'POST',
    body: JSON.stringify(data)
  })
}

// ============================================================================
// Exercises
// ============================================================================

export async function listExercises(filters = {}) {
  const query = new URLSearchParams(filters).toString()
  return request(`/api/exercises${query ? '?' + query : ''}`)
}

export async function getExercise(id) {
  return request(`/api/exercises/${id}`)
}

export async function createExercise(data) {
  return request('/api/exercises', {
    method: 'POST',
    body: JSON.stringify(data)
  })
}

export async function updateExercise(id, data) {
  return request(`/api/exercises/${id}`, {
    method: 'PUT',
    body: JSON.stringify(data)
  })
}

export async function deleteExercise(id) {
  return request(`/api/exercises/${id}`, { method: 'DELETE' })
}

// ============================================================================
// Training Planning
// ============================================================================

export async function listTrainingUnits(groupId, startDate, endDate) {
  const query = new URLSearchParams({ group_id: groupId, start_date: startDate, end_date: endDate }).toString()
  return request(`/api/training-units?${query}`)
}

export async function getTrainingUnit(id) {
  return request(`/api/training-units/${id}`)
}

export async function createTrainingUnit(data) {
  return request('/api/training-units', {
    method: 'POST',
    body: JSON.stringify(data)
  })
}

export async function updateTrainingUnit(id, data) {
  return request(`/api/training-units/${id}`, {
    method: 'PUT',
    body: JSON.stringify(data)
  })
}

// ============================================================================
// Version & Health
// ============================================================================

export async function getVersion() {
  return request('/api/version')
}

export async function healthCheck() {
  return request('/health')
}

export const api = {
  // Auth
  login,
  register,
  logout,
  getCurrentProfile,

  // Clubs & Groups
  listClubs,
  getClub,
  createClub,
  updateClub,
  deleteClub,
  listDivisions,
  createDivision,
  updateDivision,
  deleteDivision,
  listTrainingGroups,
  getTrainingGroup,
  createTrainingGroup,
  updateTrainingGroup,
  deleteTrainingGroup,

  // Skills & Methods
  listSkills,
  createSkill,
  listMethods,
  createMethod,

  // Exercises
  listExercises,
  getExercise,
  createExercise,
  updateExercise,
  deleteExercise,

  // Training Planning
  listTrainingUnits,
  getTrainingUnit,
  createTrainingUnit,
  updateTrainingUnit,

  // System
  getVersion,
  healthCheck
}

export default api