// Name: Expose Script API
// Description: REST API for script execution
// Author: erauner12

import '@johnlindquist/kit'
import express, { Express, Request, Response } from 'express'

/**
 * Interface defining the structure of a script object.
 */
interface Script {
  name: string
  filePath: string}

/**
 * Fetches all scripts available in the Script Kit environment.
 */
const scripts = await getScripts()

/**
 * Filters out the 'index' script and maps the remaining scripts to choice objects for the prompt.
 */
const choices = scripts
  .filter((s: Script) => s.name !== 'index')
  .map((s: Script) => ({
    name: s.name,
    value: s.filePath,
    description: s.filePath,
  }))

/**
 * Prompts the user to select a script from the available choices.
 */
const selectedScript = await arg<string>('Select a script to expose via REST API', choices)

/**
 * Extracts the script name from the selected script's file path.
 */
const scriptName = selectedScript.split('/').pop()?.split('.')[0]

/**
 * Prompts the user to enter the port number for the REST API, defaulting to 3000.
 */
const port = await env('PORT', 'Enter the port to use for the REST API', '3000')

/**
 * Constructs the base URL and the full endpoint URL for the REST API.
 */
const baseUrl = `http://localhost:${port}`
const endpoint = `${baseUrl}/${scriptName}`

/**
 * Displays a markdown-formatted div with information about the created REST API endpoint and example usage.
 */
await div(
  md(`
# REST API endpoint createdEndpoint: [${endpoint}](${endpoint})

## Example usage

\`\`\`bash
curl ${endpoint}
\`\`\`

## How to End Long-Running Scripts

Press "${cmd}+p" from the Main Menu to open the Process Manager. Select the process you want to end.

![http://res.cloudinary.com/johnlindquist/image/upload/v1689094925/clipboard/stzc2z4dsi15wrwdctao.png](http://res.cloudinary.com/johnlindquist/image/upload/v1689094925/clipboard/stzc2z4dsi15wrwdctao.png)
`)
)

/**
 * Hides the prompt window after displaying the endpoint information.
 */
hide()

/**
 * Initializes an Express application.
 */
const app: Express = express()

/**
 * Defines a GET endpoint for the selected script.
 * When this endpoint is called, it executes the selected script using the `run` function.
 */
app.get(`/${scriptName}`, async (req: Request, res: Response) => {
  try {
    /**     * Executes the selected script.
     */
    await run(selectedScript)
    /**
     * Sends a success response if the script executes without errors.
     */
    res.send(`Script ${scriptName} executed successfully`)
  } catch (error: any) {
    /**
     * Sends an error response if there's an issue executing the script.
     */
    res.status(500).send(`Error executing script ${scriptName}: ${error}`)
  }
})

/**
 * Starts the Express server and listens on the specified port. * Returns a promise that resolves when the server starts listening.
 */
await new Promise<void>((resolve, reject) => {
  app.listen(port, () => resolve())
})