import * as t from 'babel-types'
import generate from 'better-babel-generator'

import babylonConfig from '../config/babylon'

const template = require('babel-template')

export function convertObjectToAstExpression (obj: Record<string, any>): t.ObjectProperty[] {
  const objArr = Object.keys(obj).map(key => {
    const value = obj[key]
    if (typeof value === 'string') {
      return t.objectProperty(t.stringLiteral(key), t.stringLiteral(value))
    }
    if (typeof value === 'number') {
      return t.objectProperty(t.stringLiteral(key), t.numericLiteral(value))
    }
    if (typeof value === 'boolean') {
      return t.objectProperty(t.stringLiteral(key), t.booleanLiteral(value))
    }
    if (Array.isArray(value)) {
      return t.objectProperty(t.stringLiteral(key), t.arrayExpression(convertArrayToAstExpression(value as [])))
    }
    if (value === null) {
      return t.objectProperty(t.stringLiteral(key), t.nullLiteral())
    }
    if (typeof value === 'object') {
      return t.objectProperty(t.stringLiteral(key), t.objectExpression(convertObjectToAstExpression(value)))
    }
    return t.objectProperty(t.stringLiteral(key), t.nullLiteral())
  })
  return objArr
}

// 最低限度的转义： https://github.com/mathiasbynens/jsesc#minimal
export function generateMinimalEscapeCode (ast: t.File) {
  return generate(ast, {
    jsescOption: {
      minimal: true
    }
  }).code
}

export function convertArrayToAstExpression (arr: any[]): any[] {
  return arr.map(value => {
    if (typeof value === 'string') {
      return t.stringLiteral(value)
    }
    if (typeof value === 'number') {
      return t.numericLiteral(value)
    }
    if (typeof value === 'boolean') {
      return t.booleanLiteral(value)
    }
    if (Array.isArray(value)) {
      return convertArrayToAstExpression(value)
    }
    if (typeof value === 'object') {
      return t.objectExpression(convertObjectToAstExpression(value))
    }
    return t.nullLiteral()
  })
}

export function convertSourceStringToAstExpression (str: string, opts: object = {}) {
  return template(str, Object.assign({}, babylonConfig, opts))()
}

export function convertAstExpressionToVariable<T = any> (node): T {
  if (t.isObjectExpression(node)) {
    const obj = {}
    const properties = node.properties
    properties.forEach(property => {
      if (property.type === 'ObjectProperty' || property.type === 'ObjectMethod') {
        const key = convertAstExpressionToVariable(property.key)
        const value = convertAstExpressionToVariable(property.value)
        obj[key] = value
      }
    })
    return (obj as any) as T
  } else if (t.isArrayExpression(node)) {
    return (node.elements.map(convertAstExpressionToVariable) as any) as T
  } else if (t.isLiteral(node)) {
    return (node as any).value
  } else if (t.isIdentifier(node) || t.isJSXIdentifier(node)) {
    const name = node.name
    return name === 'undefined' ? ((undefined as any) as T) : ((name as any) as T)
  } else if (t.isJSXExpressionContainer(node)) {
    return convertAstExpressionToVariable<T>(node.expression)
  } else {
    return (undefined as any) as T
  }
}

export const getObjKey = node => {
  if (t.isIdentifier(node)) {
    return node.name
  } else {
    return node.value
  }
}