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import { type } from './type'
function parseError(maybeError){  const typeofError = maybeError.__proto__.toString()  if (![ 'Error', 'TypeError' ].includes(typeofError)) return []
  return [ typeofError, maybeError.message ]}
function parseDate(maybeDate){  if (!maybeDate.toDateString) return [ false ]
  return [ true, maybeDate.getTime() ]}
function parseRegex(maybeRegex){  if (maybeRegex.constructor !== RegExp) return [ false ]
  return [ true, maybeRegex.toString() ]}
export function equals(a, b){  if (arguments.length === 1) return _b => equals(a, _b)
  const aType = type(a)  if (aType !== type(b)) return false  if (aType === 'Function'){    return a.name === undefined ? false : a.name === b.name  }
  if ([ 'NaN', 'Undefined', 'Null' ].includes(aType)) return true
  if (aType === 'Number'){    if (Object.is(-0, a) !== Object.is(-0, b)) return false
    return a.toString() === b.toString()  }
  if ([ 'String', 'Boolean' ].includes(aType)){    return a.toString() === b.toString()  }
  if (aType === 'Array'){    const aClone = Array.from(a)    const bClone = Array.from(b)
    if (aClone.toString() !== bClone.toString()){      return false    }
    let loopArrayFlag = true    aClone.forEach((aCloneInstance, aCloneIndex) => {      if (loopArrayFlag){        if (          aCloneInstance !== bClone[ aCloneIndex ] &&          !equals(aCloneInstance, bClone[ aCloneIndex ])        ){          loopArrayFlag = false        }      }    })
    return loopArrayFlag  }
  const aRegex = parseRegex(a)  const bRegex = parseRegex(b)
  if (aRegex[ 0 ]){    return bRegex[ 0 ] ? aRegex[ 1 ] === bRegex[ 1 ] : false  } else if (bRegex[ 0 ]) return false
  const aDate = parseDate(a)  const bDate = parseDate(b)
  if (aDate[ 0 ]){    return bDate[ 0 ] ? aDate[ 1 ] === bDate[ 1 ] : false  } else if (bDate[ 0 ]) return false
  const aError = parseError(a)  const bError = parseError(b)
  if (aError[ 0 ]){    return bError[ 0 ] ?      aError[ 0 ] === bError[ 0 ] && aError[ 1 ] === bError[ 1 ] :      false  }
  if (aType === 'Object'){    const aKeys = Object.keys(a)
    if (aKeys.length !== Object.keys(b).length){      return false    }
    let loopObjectFlag = true    aKeys.forEach(aKeyInstance => {      if (loopObjectFlag){        const aValue = a[ aKeyInstance ]        const bValue = b[ aKeyInstance ]
        if (aValue !== bValue && !equals(aValue, bValue)){          loopObjectFlag = false        }      }    })
    return loopObjectFlag  }
  return false}