/**
 * Rule: prefer-await-to-then
 * Discourage using then() and instead use async/await.
 */

'use strict'

const getDocsUrl = require('./lib/get-docs-url')

module.exports = {
  meta: {
    docs: {
      url: getDocsUrl('prefer-await-to-then')
    }
  },
  create: function(context) {
    return {
      MemberExpression: function(node) {
        // you can then() if you are inside of a yield or await
        if (
          context.getAncestors().some(function(parent) {
            return (
              parent.type === 'AwaitExpression' ||
              parent.type === 'YieldExpression'
            )
          })
        ) {
          return
        }

        // if you're a then expression then you're probably a promise
        if (node.property && node.property.name === 'then') {
          context.report({
            node: node.property,
            message: 'Prefer await to then().'
          })
        }
      }
    }
  }
}