import { useSessionStore } from '@/stores/session-store'

export type User = {
  id: string
  username: string
  isAdmin: boolean
}

export type Artist = {
  id: string
  name: string
  albumCount: number
  coverArtId: string
}

export type Album = {
  id: string
  artistId: string
  artistName: string
  title: string
  year: number
  trackCount: number
  coverArtId: string
}

export type Track = {
  id: string
  albumId: string
  artistId: string
  title: string
  artistName: string
  albumTitle: string
  trackNumber: number
  durationSeconds: number
  coverArtId?: string
}

export type ArtistDetail = Artist & {
  albums: Album[]
}

export type AlbumDetail = Album & {
  tracks: Track[]
}

export type SearchResults = {
  artists: Artist[]
  albums: Album[]
  tracks: Track[]
}

export type ScanStatus = {
  scanning: boolean
  startedAt?: string
  finishedAt?: string
  lastError?: string
  artists: number
  albums: number
  tracks: number
}

export type HomePayload = {
  recentAlbums: Album[]
  artists: Artist[]
}

export type PlaylistSummary = {
  id: string
  name: string
  comment: string
  public: boolean
  songCount: number
  durationSeconds: number
  createdAt: string
  updatedAt: string
}

export type PlaylistDetail = PlaylistSummary & {
  tracks: Track[]
}

const API_BASE = import.meta.env.VITE_API_BASE ?? 'http://localhost:4040'

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const token = useSessionStore.getState().token
  const response = await fetch(`${API_BASE}${path}`, {
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
      ...(init?.headers ?? {}),
    },
    ...init,
  })

  if (!response.ok) {
    throw new Error(`Request failed: ${response.status}`)
  }

  if (response.status === 204) {
    return undefined as T
  }

  return response.json() as Promise<T>
}

export async function login(username: string, password: string) {
  return request<{ token: string; user: User }>('/api/auth/login', {
    method: 'POST',
    body: JSON.stringify({ username, password }),
  })
}

export async function fetchHome() {
  return request<HomePayload>('/api/home')
}

export async function fetchArtists() {
  return request<{ items: Artist[] }>('/api/artists')
}

export async function fetchArtist(id: string) {
  return request<ArtistDetail>(`/api/artists/${id}`)
}

export async function fetchAlbums() {
  return request<{ items: Album[] }>('/api/albums')
}

export async function fetchAlbum(id: string) {
  return request<AlbumDetail>(`/api/albums/${id}`)
}

export async function fetchTracks() {
  return request<{ items: Track[] }>('/api/tracks')
}

export async function fetchTrack(id: string) {
  return request<Track>(`/api/tracks/${id}`)
}

export async function searchLibrary(query: string) {
  return request<SearchResults>(`/api/search?q=${encodeURIComponent(query)}`)
}

export async function fetchScanStatus() {
  return request<ScanStatus>('/api/admin/scan-status')
}

export async function triggerScan() {
  return request<ScanStatus>('/api/admin/scan', { method: 'POST' })
}

export async function fetchPlaylists() {
  return request<{ items: PlaylistSummary[] }>('/api/playlists')
}

export async function fetchPlaylist(id: string) {
  return request<PlaylistDetail>(`/api/playlists/${id}`)
}

export async function createPlaylist(input: {
  name: string
  comment?: string
  public?: boolean
  trackIds?: string[]
}) {
  return request<PlaylistDetail>('/api/playlists', {
    method: 'POST',
    body: JSON.stringify(input),
  })
}

export async function updatePlaylist(
  id: string,
  input: {
    name?: string
    comment?: string
    public?: boolean
    addTrackIds?: string[]
    removeTrackIds?: string[]
  },
) {
  return request<PlaylistDetail>(`/api/playlists/${id}`, {
    method: 'PATCH',
    body: JSON.stringify(input),
  })
}

export async function deletePlaylist(id: string) {
  await request<void>(`/api/playlists/${id}`, { method: 'DELETE' })
}

export function coverArtUrl(id: string) {
  const token = useSessionStore.getState().token
  return `${API_BASE}/api/cover-art/${id}${token ? `?token=${encodeURIComponent(token)}` : ''}`
}

export function streamUrl(id: string) {
  const token = useSessionStore.getState().token
  return `${API_BASE}/api/stream/${id}${token ? `?token=${encodeURIComponent(token)}` : ''}`
}