interface Note {
  id: string
  x: number
  y: number
  content: string
}

interface Space {
  id: string
  notes: Note[]
}

type StorageMode = 'indexeddb' | 'database'

interface StorageAdapter {
  init(): Promise<void>
  getSpace(id: string): Promise<Space | undefined>
  saveSpace(space: Space): Promise<void>
  createSpace(id: string): Promise<Space>
  addNoteToSpace(spaceId: string, note: Note): Promise<void>
  updateNoteInSpace(spaceId: string, noteId: string, updates: Partial<Note>): Promise<void>
  deleteNoteFromSpace(spaceId: string, noteId: string): Promise<void>
  getAllSpaceIds(): Promise<string[]>
  deleteSpace(id: string): Promise<void>
}

class IndexedDBAdapter implements StorageAdapter {
  private db: IDBDatabase | null = null

  async init() {
    return new Promise<void>((resolve, reject) => {
      const request = indexedDB.open('palace-db', 1)
      
      request.onerror = () => reject(request.error)
      request.onsuccess = () => {
        this.db = request.result
        resolve()
      }
      
      request.onupgradeneeded = (event) => {
        const db = (event.target as IDBOpenDBRequest).result
        if (!db.objectStoreNames.contains('spaces')) {
          db.createObjectStore('spaces', { keyPath: 'id' })
        }
      }
    })
  }

  async getSpace(id: string): Promise<Space | undefined> {
    if (!this.db) {
await this.init()
}
    return new Promise((resolve, reject) => {
      const transaction = this.db!.transaction(['spaces'], 'readonly')
      const store = transaction.objectStore('spaces')
      const request = store.get(id)
      
      request.onerror = () => reject(request.error)
      request.onsuccess = () => resolve(request.result)
    })
  }

  async saveSpace(space: Space): Promise<void> {
    if (!this.db) {
await this.init()
}
    return new Promise((resolve, reject) => {
      const transaction = this.db!.transaction(['spaces'], 'readwrite')
      const store = transaction.objectStore('spaces')
      const request = store.put(space)
      
      request.onerror = () => reject(request.error)
      request.onsuccess = () => resolve()
    })
  }

  async createSpace(id: string): Promise<Space> {
    const space: Space = {
      id,
      notes: []
    }
    await this.saveSpace(space)
    return space
  }

  async addNoteToSpace(spaceId: string, note: Note): Promise<void> {
    const space = await this.getSpace(spaceId)
    if (!space) {
      throw new Error(`Space ${spaceId} not found`)
    }
    space.notes.push(note)
    await this.saveSpace(space)
  }

  async updateNoteInSpace(spaceId: string, noteId: string, updates: Partial<Note>): Promise<void> {
    const space = await this.getSpace(spaceId)
    if (!space) {
      throw new Error(`Space ${spaceId} not found`)
    }
    const noteIndex = space.notes.findIndex(n => n.id === noteId)
    if (noteIndex === -1) {
      throw new Error(`Note ${noteId} not found in space ${spaceId}`)
    }
    space.notes[noteIndex] = { ...space.notes[noteIndex]!, ...updates } as Note
    await this.saveSpace(space)
  }

  async deleteNoteFromSpace(spaceId: string, noteId: string): Promise<void> {
    const space = await this.getSpace(spaceId)
    if (!space) {
      throw new Error(`Space ${spaceId} not found`)
    }
    space.notes = space.notes.filter(n => n.id !== noteId)
    await this.saveSpace(space)
  }

  async getAllSpaceIds(): Promise<string[]> {
    if (!this.db) {
await this.init()
}
    return new Promise((resolve, reject) => {
      const transaction = this.db!.transaction(['spaces'], 'readonly')
      const store = transaction.objectStore('spaces')
      const request = store.getAllKeys()
      
      request.onerror = () => reject(request.error)
      request.onsuccess = () => resolve(request.result as string[])
    })
  }

  async deleteSpace(id: string): Promise<void> {
    if (!this.db) {
await this.init()
}
    return new Promise((resolve, reject) => {
      const transaction = this.db!.transaction(['spaces'], 'readwrite')
      const store = transaction.objectStore('spaces')
      const request = store.delete(id)
      
      request.onerror = () => reject(request.error)
      request.onsuccess = () => resolve()
    })
  }
}

class DatabaseAdapter implements StorageAdapter {
  private readonly apiUrl: string

  constructor(apiUrl?: string) {
    this.apiUrl = apiUrl || this.getApiUrl()
  }

  private getApiUrl(): string {
    if (typeof window !== 'undefined' && window.location.hostname === 'palace.raphaelforment.fr') {
      return 'https://palace.raphaelforment.fr:3001/api'
    }
    return '/api'
  }

  async init(): Promise<void> {
    // Database connection is handled per request
  }

  async getSpace(id: string): Promise<Space | undefined> {
    const response = await fetch(`${this.apiUrl}/spaces/${id}`)
    if (response.status === 404) {
return undefined
}
    if (!response.ok) {
throw new Error(`Failed to get space: ${response.statusText}`)
}
    return await response.json()
  }

  async saveSpace(space: Space): Promise<void> {
    const response = await fetch(`${this.apiUrl}/spaces/${space.id}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(space)
    })
    if (!response.ok) {
throw new Error(`Failed to save space: ${response.statusText}`)
}
  }

  async createSpace(id: string): Promise<Space> {
    const space: Space = { id, notes: [] }
    await this.saveSpace(space)
    return space
  }

  async addNoteToSpace(spaceId: string, note: Note): Promise<void> {
    const response = await fetch(`${this.apiUrl}/spaces/${spaceId}/notes`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(note)
    })
    if (!response.ok) {
throw new Error(`Failed to add note: ${response.statusText}`)
}
  }

  async updateNoteInSpace(spaceId: string, noteId: string, updates: Partial<Note>): Promise<void> {
    const response = await fetch(`${this.apiUrl}/spaces/${spaceId}/notes/${noteId}`, {
      method: 'PATCH',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(updates)
    })
    if (!response.ok) {
throw new Error(`Failed to update note: ${response.statusText}`)
}
  }

  async deleteNoteFromSpace(spaceId: string, noteId: string): Promise<void> {
    const response = await fetch(`${this.apiUrl}/spaces/${spaceId}/notes/${noteId}`, {
      method: 'DELETE'
    })
    if (!response.ok) {
throw new Error(`Failed to delete note: ${response.statusText}`)
}
  }

  async getAllSpaceIds(): Promise<string[]> {
    const response = await fetch(`${this.apiUrl}/spaces`)
    if (!response.ok) {
throw new Error(`Failed to get spaces: ${response.statusText}`)
}
    const spaces = await response.json()
    return spaces.map((space: Space) => space.id)
  }

  async deleteSpace(id: string): Promise<void> {
    const response = await fetch(`${this.apiUrl}/spaces/${id}`, {
      method: 'DELETE'
    })
    if (!response.ok) {
throw new Error(`Failed to delete space: ${response.statusText}`)
}
  }
}

function getStorageMode(): StorageMode {
  return (localStorage.getItem('palace-storage-mode') as StorageMode) || 'indexeddb'
}

function setStorageMode(mode: StorageMode): void {
  localStorage.setItem('palace-storage-mode', mode)
}

function createStorageAdapter(): StorageAdapter {
  const mode = getStorageMode()
  switch (mode) {
    case 'database':
      return new DatabaseAdapter()
    case 'indexeddb':
    default:
      return new IndexedDBAdapter()
  }
}

export const db = createStorageAdapter()
export { type Note, type Space, type StorageMode, getStorageMode, setStorageMode }