import { getNativeBridgeWindow, hasFlutterBridge } from './environment'
import { mobileUtil } from './mobileUtil'

/** 原生文件选择桥接名（按优先级） */
const NATIVE_FILE_PICKER_BRIDGES = [
  'pickFile',
  'chooseFile',
  'filePicker',
  'selectFile',
  'openFilePicker',
  'fileAlbum',
  'documentPicker',
  'chooseDocument',
]

export interface NativePickedFile {
  name?: string
  size?: number | string
  filePath?: string
  path?: string
  content?: string
}

export function getNativeFilePickerBridge(): string | null {
  for (const name of NATIVE_FILE_PICKER_BRIDGES) {
    if (hasFlutterBridge(name))
      return name
  }
  return null
}

export function hasNativeFilePicker(): boolean {
  return !!getNativeFilePickerBridge()
}

function normalizePickedFiles(data: any): NativePickedFile[] {
  if (!data)
    return []
  if (Array.isArray(data.files))
    return data.files
  if (Array.isArray(data))
    return data
  return [data]
}

/**
 * App 内打开系统文件选择器（需 Flutter 侧实现对应桥接）。
 * 返回 true 表示已发起原生调用。
 */
export function openNativeFilePicker(
  options: {
    accept?: string
    multiple?: boolean
    onSuccess: (files: NativePickedFile[]) => void
    onError?: (message?: string) => void
  },
): boolean {
  const bridgeName = getNativeFilePickerBridge()
  if (!bridgeName)
    return false

  mobileUtil.execute({
    funcName: bridgeName,
    param: {
      accept: options.accept || '*/*',
      multiple: options.multiple ?? true,
    },
    callbackFunc: (result: any) => {
      if (result?.status === 'success') {
        const files = normalizePickedFiles(result.data)
        if (files.length > 0)
          options.onSuccess(files)
        else
          options.onError?.('未选择文件')
        return
      }
      if (result?.data?.status === 'cancelled')
        return
      options.onError?.(result?.message || result?.msg || '文件选择失败')
    },
  })
  return true
}

/** 同步触发浏览器 file input（须在用户点击事件的同一调用栈内） */
export function triggerBrowserFileInput(input: HTMLInputElement | undefined | null): boolean {
  if (!input)
    return false
  input.value = ''
  input.click()
  return true
}

/** 调试：列出当前 window 上已注入的桥接名 */
export function listNativeBridges(): string[] {
  const win = getNativeBridgeWindow()
  return Object.keys(win).filter(key => typeof win[key]?.postMessage === 'function')
}