// transpile internal data type
import { SYMBOL_GEO_POINT, SYMBOL_SERVER_DATE, SYMBOL_REGEXP } from '../helper/symbol'
import { getType, isObject, isArray, isDate, isNumber, isInternalObject, isRegExp } from '../utils/type'
import { Point } from '../geo'
import { ServerDate } from '../serverDate'
import { RegExp } from '../regexp'
import { LogicCommand } from '../commands/logic'

export type IQueryCondition = Record<string, any> | LogicCommand

export type AnyObject = {
  [x: string]: any
}

export function serialize(val: any): IQueryCondition {
  return serializeHelper(val, [val])
}

function serializeHelper(
  val: any,
  visited: object[]
): Record<string, any> {
  if (isInternalObject(val)) {
    switch (val._internalType) {
      case SYMBOL_GEO_POINT: {
        return (val as Point).toJSON()
      }
      case SYMBOL_SERVER_DATE: {
        return (val as ServerDate).parse()
      }
      case SYMBOL_REGEXP: {
        return (val as RegExp).parse()
      }
      default: {
        return val.toJSON ? val.toJSON() : val
      }
    }
  } else if (isDate(val)) {
    return {
      $date: +val,
    }
  } else if (isRegExp(val)) {
    return {
      $regex: val.source,
      $options: val.flags,
    }
  } else if (isArray(val)) {
    return val.map(item => {
      if (visited.indexOf(item) > -1) {
        throw new Error(`Cannot convert circular structure to JSON`)
      }

      return serializeHelper(item, [
        ...visited,
        item,
      ])
    })
  } else if (isObject(val)) {
    const ret: AnyObject = { ...val }
    for (const key in ret) {
      if (visited.indexOf(ret[key]) > -1) {
        throw new Error(`Cannot convert circular structure to JSON`)
      }

      ret[key] = serializeHelper(ret[key], [
        ...visited,
        ret[key],
      ])
    }
    return ret
  } else {
    return val
  }
}

export function deserialize(object: AnyObject): any {
  const ret = { ...object }
  for (const key in ret) {
    switch (key) {
      case '$date': {
        switch (getType(ret[key])) {
          case 'number': {
            // normal timestamp
            return new Date(ret[key])
          }
          case 'object': {
            // serverDate
            return new ServerDate(ret[key])
          }
        }
        break
      }
      case 'type': {
        switch (ret.type) {
          case 'Point': {
            // GeoPoint
            if (isArray(ret.coordinates) && isNumber(ret.coordinates[0]) && isNumber(ret.coordinates[1])) {
              return new Point(ret.coordinates[0], ret.coordinates[1])
            }
            break
          }
        }
        break
      }
    }
  }
  return object
}