#!/usr/bin/env node
const { promises: { readFile, writeFile } } = require('fs')
const path = require('path')
const { homedir } = require('os')

const util = require('util');
const { exec } = require('child_process')

const JSON_FILE = path.resolve(homedir(), 'nixos/snippets.json')

const $ = async (cmd, input) => {
  const stdout = await (new Promise((resolve, reject) => {
    const ps = exec(cmd, (err, stdout) => err ? reject(err) : resolve(stdout))
    if (typeof input === 'string') {
      ps.stdin.end(input)
    }
  }))

  return `${stdout}`.toString().trim()
}

const getSelection = () => $(`xclip -o`)

const saveToClipboard = text => $('xclip -i -selection clipboard', text)

const promptName = () => $(`sh -c 'echo -n "" | dmenu -p "Name :: "'`) // TODO: use input

// TODO: Show current tags
const promptTags = () => $(`sh -c 'echo -n "" | dmenu -p "Tags :: "'`)
  .then(input => `${input}`.split(/\s+/g).filter(Boolean))

const getCurrentJson = async () => {
  try {
    const contents = await readFile(JSON_FILE, 'utf8')
    return JSON.parse(contents.toString())
  } catch(_) {
    return {}
  }
}

const setCurrentJson = (data) =>
  writeFile(JSON_FILE, JSON.stringify(data, null, 2))

const promptSelect = async ls => $(`dmenu -p "Snippets :: "`, ls.join('\n'))

const saveSnippets = async () => {
  const contents = await getSelection()
  const currentSnippets = await getCurrentJson()

  const name = await promptName()
  const tags = await promptTags()

  const data = {
    ...currentSnippets,
    [name]: {
      contents,
      tags,
    },
  }

  await setCurrentJson(data)
}

const loadSnippets = async () => {
  const currentSnippets = await getCurrentJson()
  const seperator = ' :: '

  const menuInput = Object.entries(currentSnippets)
    .map(([ name, { tags } ]) => `${name}${seperator}(${tags.join(', ')})`)

  const selection = await promptSelect(menuInput)

  if (selection) {
    const name = selection.split(seperator)[0].trim()
    const { contents } = currentSnippets[name] || {}
    console.log(contents)
    await saveToClipboard(contents)
  }
}

const main = async () => {
  try {
    await saveToClipboard('foobaraa')
    // await loadSnippets()
  } catch(_) {
    console.log('cancelled')
  }
}

main()