import { contextBridge, ipcRenderer } from 'electron'
import type {
  ListDirResult,
  OpenFileResult,
  OpenFolderResult,
  OpenImageResult,
  SaveDialogResult
} from './ipc-types.js'

const bufferedOpenFiles: string[][] = []
let openFilesHandler: ((paths: string[]) => void) | null = null

ipcRenderer.on('myreader:open-files', (_e, paths: string[]) => {
  if (openFilesHandler) {
    openFilesHandler(paths)
  } else {
    bufferedOpenFiles.push(paths)
  }
})

export interface MyReaderApi {
  openFileDialog: () => Promise<OpenFileResult>
  openFolderDialog: () => Promise<OpenFolderResult>
  openImageDialog: () => Promise<OpenImageResult>
  saveFileDialog: (defaultPath?: string) => Promise<SaveDialogResult>
  readFile: (filePath: string) => Promise<string>
  writeFile: (filePath: string, content: string) => Promise<void>
  listDirectory: (dirPath: string) => Promise<ListDirResult>
  parentDirectory: (dirPath: string) => Promise<string>
  resolveRelativePath: (baseFilePath: string, href: string) => Promise<string>
  openExternal: (url: string) => Promise<void>
  defaultDirectory: () => Promise<string>
  deleteFile: (filePath: string) => Promise<void>
  renamePath: (oldPath: string, newName: string) => Promise<{ newPath: string }>
  allowClose: () => void
  onRequestClose: (handler: () => void) => () => void
  onMenuAction: (handler: (action: string) => void) => () => void
  onOpenFiles: (handler: (paths: string[]) => void) => () => void
  getPendingFilesIPC: () => Promise<string[]>
}

const api: MyReaderApi = {
  openFileDialog: () => ipcRenderer.invoke('myreader:open-file-dialog'),
  openFolderDialog: () => ipcRenderer.invoke('myreader:open-folder-dialog'),
  openImageDialog: () => ipcRenderer.invoke('myreader:open-image-dialog'),
  saveFileDialog: (defaultPath?: string) => ipcRenderer.invoke('myreader:save-dialog', defaultPath),
  readFile: (filePath: string) => ipcRenderer.invoke('myreader:read-file', filePath),
  writeFile: (filePath: string, content: string) =>
    ipcRenderer.invoke('myreader:write-file', filePath, content),
  listDirectory: (dirPath: string) => ipcRenderer.invoke('myreader:list-directory', dirPath),
  parentDirectory: (dirPath: string) => ipcRenderer.invoke('myreader:parent-directory', dirPath),
  resolveRelativePath: (baseFilePath: string, href: string) =>
    ipcRenderer.invoke('myreader:resolve-relative-path', baseFilePath, href),
  openExternal: (url: string) => ipcRenderer.invoke('myreader:open-external', url),
  defaultDirectory: () => ipcRenderer.invoke('myreader:default-directory'),
  deleteFile: (filePath: string) => ipcRenderer.invoke('myreader:delete-file', filePath),
  renamePath: (oldPath: string, newName: string) =>
    ipcRenderer.invoke('myreader:rename-path', oldPath, newName),
  allowClose: () => {
    ipcRenderer.send('myreader:allow-close')
  },
  onRequestClose: (handler: () => void) => {
    const listener = (): void => {
      handler()
    }
    ipcRenderer.on('myreader:request-close', listener)
    return () => {
      ipcRenderer.removeListener('myreader:request-close', listener)
    }
  },
  onMenuAction: (handler: (action: string) => void) => {
    const listener = (_e: unknown, action: string): void => {
      handler(action)
    }
    ipcRenderer.on('myreader:menu', listener)
    return () => {
      ipcRenderer.removeListener('myreader:menu', listener)
    }
  },
  onOpenFiles: (handler: (paths: string[]) => void) => {
    openFilesHandler = handler
    return () => {
      openFilesHandler = null
    }
  },
  getPendingFilesIPC: async (): Promise<string[]> => {
    const fromMain = await ipcRenderer.invoke('myreader:get-pending-files')
    const fromBuffer = bufferedOpenFiles.flat()
    bufferedOpenFiles.length = 0
    const seen = new Set<string>()
    const merged: string[] = []
    for (const p of [...fromMain, ...fromBuffer]) {
      const key = p.replace(/\\/g, '/').toLowerCase()
      if (seen.has(key)) continue
      seen.add(key)
      merged.push(p)
    }
    return merged
  }
}

try {
  contextBridge.exposeInMainWorld('myreader', api)
} catch (e) {
  console.error('[MyReader] preload contextBridge failed', e)
}