import type { Session } from 'next-auth'
import toast from 'react-hot-toast'
import { Octokit } from '@octokit/core'
import Router from 'next/router'

import state from '../index'
import { saveAllFiles } from './saveFile'

const octokit = new Octokit()

// Syncs the current files from the state to GitHub Gists.
export const syncToGist = async (session?: Session | null, createNewGist?: boolean) => {
  saveAllFiles()
  let files: Record<string, { filename: string; content: string }> = {}
  state.gistLoading = true

  if (!session || !session.user) {
    state.gistLoading = false
    return toast.error('You need to be logged in!')
  }
  const toastId = toast.loading('Pushing to Gist')
  if (!state.files || !state.files.length) {
    state.gistLoading = false
    return toast.error(`You need to create some files we can push to gist`, {
      id: toastId
    })
  }
  if (state.gistId && session?.user.username === state.gistOwner && !createNewGist) {
    // You can only remove files from Gist by updating file with empty contents
    // So we need to fetch existing files and compare those to local state
    // and then send empty content if we don't have matching files anymore
    // on local state
    const currentFilesRes = await octokit.request('GET /gists/{gist_id}', {
      gist_id: state.gistId
    })
    if (currentFilesRes.data.files) {
      Object.keys(currentFilesRes?.data?.files).forEach(filename => {
        files[`${filename}`] = { filename, content: '' }
      })
    }
    state.files.forEach(file => {
      files[`${file.name}`] = { filename: file.name, content: file.content }
    })
    // Update existing Gist
    octokit
      .request('PATCH /gists/{gist_id}', {
        gist_id: state.gistId,
        files,
        headers: {
          authorization: `token ${session?.accessToken || ''}`
        }
      })
      .then(res => {
        state.gistLoading = false
        return toast.success('Updated to gist successfully!', { id: toastId })
      })
      .catch(err => {
        console.log(err)
        state.gistLoading = false
        return toast.error(`Could not update Gist, try again later!`, {
          id: toastId
        })
      })
  } else {
    // Not Gist of the current user or it isn't Gist yet
    state.files.forEach(file => {
      files[`${file.name}`] = { filename: file.name, content: file.content }
    })
    octokit
      .request('POST /gists', {
        files,
        public: true,
        headers: {
          authorization: `token ${session?.accessToken || ''}`
        }
      })
      .then(res => {
        state.gistLoading = false
        state.gistOwner = res.data.owner?.login
        state.gistId = res.data.id
        state.gistName = Array.isArray(res.data.files)
          ? Object.keys(res.data?.files)?.[0]
          : 'Untitled'
        Router.push({ pathname: `/develop/${res.data.id}` })
        return toast.success('Created new gist successfully!', { id: toastId })
      })
      .catch(err => {
        console.log(err)
        state.gistLoading = false
        return toast.error(`Could not create Gist, try again later!`, {
          id: toastId
        })
      })
  }
}

export default syncToGist