import { contextBridge, ipcRenderer, shell } from 'electron'
import { IPC_CHANNELS } from '../shared/ipc-channels'
import type { ElectronAPI } from '../renderer/types/ipc'

// C-02: 运行时实现受 ElectronAPI 类型约束，编译期保证 preload 与渲染进程契约一致
const api: ElectronAPI = {
  // File operations
  openFile: () => ipcRenderer.invoke(IPC_CHANNELS.DIALOG_OPEN_FILE),
  readFile: (filePath: string) => ipcRenderer.invoke(IPC_CHANNELS.FILE_READ, filePath),
  saveFile: (data) => ipcRenderer.invoke(IPC_CHANNELS.FILE_SAVE, data),
  saveFileAs: (data) => ipcRenderer.invoke(IPC_CHANNELS.FILE_SAVE_AS, data),
  getCurrentPath: () => ipcRenderer.invoke(IPC_CHANNELS.FILE_GET_CURRENT_PATH),
  getFileStats: (filePath: string) => ipcRenderer.invoke(IPC_CHANNELS.FILE_STATS, filePath),
  reloadFile: () => ipcRenderer.invoke(IPC_CHANNELS.FILE_RELOAD),

  // Tab management
  tabSwitched: (filePath: string | null) => ipcRenderer.invoke(IPC_CHANNELS.TAB_SWITCHED, filePath),

  // Window control
  forceClose: () => ipcRenderer.invoke(IPC_CHANNELS.WINDOW_FORCE_CLOSE),
  cancelClose: () => ipcRenderer.invoke(IPC_CHANNELS.WINDOW_CANCEL_CLOSE),

  // Shell — 仅允许 http/https 协议
  openExternal: (url: string) => {
    try {
      const parsed = new URL(url)
      if (parsed.protocol === 'http:' || parsed.protocol === 'https:') {
        shell.openExternal(url)
      }
    } catch {
      // 无效 URL，忽略
    }
  },

  // File Tree (Sidebar)
  readDirTree: (dirPath: string) => ipcRenderer.invoke(IPC_CHANNELS.DIR_READ_TREE, dirPath),
  openFolderDialog: () => ipcRenderer.invoke(IPC_CHANNELS.DIR_OPEN_DIALOG),
  watchDir: (dirPath: string) => ipcRenderer.invoke(IPC_CHANNELS.DIR_WATCH, dirPath),
  unwatchDir: () => ipcRenderer.invoke(IPC_CHANNELS.DIR_UNWATCH),

  // Events from main process — 返回取消订阅函数
  onFileOpenInTab: (callback) => {
    const handler = (_event: Electron.IpcRendererEvent, data: { filePath: string; content: string }) => callback(data)
    ipcRenderer.on(IPC_CHANNELS.FILE_OPEN_IN_TAB, handler)
    return () => { ipcRenderer.removeListener(IPC_CHANNELS.FILE_OPEN_IN_TAB, handler) }
  },
  onExternalModification: (callback) => {
    const handler = (_event: Electron.IpcRendererEvent, filePath: string) => callback(filePath)
    ipcRenderer.on(IPC_CHANNELS.FILE_EXTERNALLY_MODIFIED, handler)
    return () => { ipcRenderer.removeListener(IPC_CHANNELS.FILE_EXTERNALLY_MODIFIED, handler) }
  },
  onDirChanged: (callback) => {
    const handler = () => callback()
    ipcRenderer.on(IPC_CHANNELS.SIDEBAR_DIR_CHANGED, handler)
    return () => { ipcRenderer.removeListener(IPC_CHANNELS.SIDEBAR_DIR_CHANGED, handler) }
  },
  onConfirmClose: (callback) => {
    const handler = () => callback()
    ipcRenderer.on(IPC_CHANNELS.WINDOW_CONFIRM_CLOSE, handler)
    return () => { ipcRenderer.removeListener(IPC_CHANNELS.WINDOW_CONFIRM_CLOSE, handler) }
  }
}

contextBridge.exposeInMainWorld('electronAPI', api)