import type {Format, FormatDefinition} from "ajv"
import type {FormatValidator, FormatCompare} from "ajv/dist/types"

export type FormatMode = "fast" | "full"

export type FormatName =
  | "date"
  | "time"
  | "date-time"
  | "duration"
  | "uri"
  | "uri-reference"
  | "uri-template"
  | "url"
  | "email"
  | "hostname"
  | "ipv4"
  | "ipv6"
  | "regex"
  | "uuid"
  | "json-pointer"
  | "json-pointer-uri-fragment"
  | "relative-json-pointer"
  | "byte"
  | "int32"
  | "int64"
  | "float"
  | "double"
  | "password"
  | "binary"

export type DefinedFormats = {
  [key in FormatName]: Format
}

function fmtDef(
  validate: RegExp | FormatValidator<string>,
  compare: FormatCompare<string>
): FormatDefinition<string> {
  return {validate, compare}
}

export const fullFormats: DefinedFormats = {
  // date: http://tools.ietf.org/html/rfc3339#section-5.6
  date: fmtDef(date, compareDate),
  // date-time: http://tools.ietf.org/html/rfc3339#section-5.6
  time: fmtDef(time, compareTime),
  "date-time": fmtDef(date_time, compareDateTime),
  // duration: https://tools.ietf.org/html/rfc3339#appendix-A
  duration: /^P(?!$)((\d+Y)?(\d+M)?(\d+D)?(T(?=\d)(\d+H)?(\d+M)?(\d+S)?)?|(\d+W)?)$/,
  uri,
  "uri-reference":
    /^(?:[a-z][a-z0-9+\-.]*:)?(?:\/?\/(?:(?:[a-z0-9\-._~!$&'()*+,;=:]|%[0-9a-f]{2})*@)?(?:\[(?:(?:(?:(?:[0-9a-f]{1,4}:){6}|::(?:[0-9a-f]{1,4}:){5}|(?:[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){4}|(?:(?:[0-9a-f]{1,4}:){0,1}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){3}|(?:(?:[0-9a-f]{1,4}:){0,2}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){2}|(?:(?:[0-9a-f]{1,4}:){0,3}[0-9a-f]{1,4})?::[0-9a-f]{1,4}:|(?:(?:[0-9a-f]{1,4}:){0,4}[0-9a-f]{1,4})?::)(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?))|(?:(?:[0-9a-f]{1,4}:){0,5}[0-9a-f]{1,4})?::[0-9a-f]{1,4}|(?:(?:[0-9a-f]{1,4}:){0,6}[0-9a-f]{1,4})?::)|[Vv][0-9a-f]+\.[a-z0-9\-._~!$&'()*+,;=:]+)\]|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)|(?:[a-z0-9\-._~!$&'"()*+,;=]|%[0-9a-f]{2})*)(?::\d*)?(?:\/(?:[a-z0-9\-._~!$&'"()*+,;=:@]|%[0-9a-f]{2})*)*|\/(?:(?:[a-z0-9\-._~!$&'"()*+,;=:@]|%[0-9a-f]{2})+(?:\/(?:[a-z0-9\-._~!$&'"()*+,;=:@]|%[0-9a-f]{2})*)*)?|(?:[a-z0-9\-._~!$&'"()*+,;=:@]|%[0-9a-f]{2})+(?:\/(?:[a-z0-9\-._~!$&'"()*+,;=:@]|%[0-9a-f]{2})*)*)?(?:\?(?:[a-z0-9\-._~!$&'"()*+,;=:@/?]|%[0-9a-f]{2})*)?(?:#(?:[a-z0-9\-._~!$&'"()*+,;=:@/?]|%[0-9a-f]{2})*)?$/i,
  // uri-template: https://tools.ietf.org/html/rfc6570
  "uri-template":
    /^(?:(?:[^\x00-\x20"'<>%\\^`{|}]|%[0-9a-f]{2})|\{[+#./;?&=,!@|]?(?:[a-z0-9_]|%[0-9a-f]{2})+(?::[1-9][0-9]{0,3}|\*)?(?:,(?:[a-z0-9_]|%[0-9a-f]{2})+(?::[1-9][0-9]{0,3}|\*)?)*\})*$/i,
  // For the source: https://gist.github.com/dperini/729294
  // For test cases: https://mathiasbynens.be/demo/url-regex
  url: /^(?:https?|ftp):\/\/(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z0-9\u{00a1}-\u{ffff}]+-)*[a-z0-9\u{00a1}-\u{ffff}]+)(?:\.(?:[a-z0-9\u{00a1}-\u{ffff}]+-)*[a-z0-9\u{00a1}-\u{ffff}]+)*(?:\.(?:[a-z\u{00a1}-\u{ffff}]{2,})))(?::\d{2,5})?(?:\/[^\s]*)?$/iu,
  email:
    /^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/i,
  hostname:
    /^(?=.{1,253}\.?$)[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?(?:\.[a-z0-9](?:[-0-9a-z]{0,61}[0-9a-z])?)*\.?$/i,
  // optimized https://www.safaribooksonline.com/library/view/regular-expressions-cookbook/9780596802837/ch07s16.html
  ipv4: /^(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)$/,
  ipv6: /^((([0-9a-f]{1,4}:){7}([0-9a-f]{1,4}|:))|(([0-9a-f]{1,4}:){6}(:[0-9a-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9a-f]{1,4}:){5}(((:[0-9a-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9a-f]{1,4}:){4}(((:[0-9a-f]{1,4}){1,3})|((:[0-9a-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9a-f]{1,4}:){3}(((:[0-9a-f]{1,4}){1,4})|((:[0-9a-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9a-f]{1,4}:){2}(((:[0-9a-f]{1,4}){1,5})|((:[0-9a-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9a-f]{1,4}:){1}(((:[0-9a-f]{1,4}){1,6})|((:[0-9a-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9a-f]{1,4}){1,7})|((:[0-9a-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))$/i,
  regex,
  // uuid: http://tools.ietf.org/html/rfc4122
  uuid: /^(?:urn:uuid:)?[0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12}$/i,
  // JSON-pointer: https://tools.ietf.org/html/rfc6901
  // uri fragment: https://tools.ietf.org/html/rfc3986#appendix-A
  "json-pointer": /^(?:\/(?:[^~/]|~0|~1)*)*$/,
  "json-pointer-uri-fragment": /^#(?:\/(?:[a-z0-9_\-.!$&'()*+,;:=@]|%[0-9a-f]{2}|~0|~1)*)*$/i,
  // relative JSON-pointer: http://tools.ietf.org/html/draft-luff-relative-json-pointer-00
  "relative-json-pointer": /^(?:0|[1-9][0-9]*)(?:#|(?:\/(?:[^~/]|~0|~1)*)*)$/,
  // the following formats are used by the openapi specification: https://spec.openapis.org/oas/v3.0.0#data-types
  // byte: https://github.com/miguelmota/is-base64
  byte,
  // signed 32 bit integer
  int32: {type: "number", validate: validateInt32},
  // signed 64 bit integer
  int64: {type: "number", validate: validateInt64},
  // C-type float
  float: {type: "number", validate: validateNumber},
  // C-type double
  double: {type: "number", validate: validateNumber},
  // hint to the UI to hide input strings
  password: true,
  // unchecked string payload
  binary: true,
}

export const fastFormats: DefinedFormats = {
  ...fullFormats,
  date: fmtDef(/^\d\d\d\d-[0-1]\d-[0-3]\d$/, compareDate),
  time: fmtDef(
    /^(?:[0-2]\d:[0-5]\d:[0-5]\d|23:59:60)(?:\.\d+)?(?:z|[+-]\d\d(?::?\d\d)?)?$/i,
    compareTime
  ),
  "date-time": fmtDef(
    /^\d\d\d\d-[0-1]\d-[0-3]\d[t\s](?:[0-2]\d:[0-5]\d:[0-5]\d|23:59:60)(?:\.\d+)?(?:z|[+-]\d\d(?::?\d\d)?)$/i,
    compareDateTime
  ),
  // uri: https://github.com/mafintosh/is-my-json-valid/blob/master/formats.js
  uri: /^(?:[a-z][a-z0-9+\-.]*:)(?:\/?\/)?[^\s]*$/i,
  "uri-reference": /^(?:(?:[a-z][a-z0-9+\-.]*:)?\/?\/)?(?:[^\\\s#][^\s#]*)?(?:#[^\\\s]*)?$/i,
  // email (sources from jsen validator):
  // http://stackoverflow.com/questions/201323/using-a-regular-expression-to-validate-an-email-address#answer-8829363
  // http://www.w3.org/TR/html5/forms.html#valid-e-mail-address (search for 'wilful violation')
  email:
    /^[a-z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?(?:\.[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?)*$/i,
}

export const formatNames = Object.keys(fullFormats) as FormatName[]

function isLeapYear(year: number): boolean {
  // https://tools.ietf.org/html/rfc3339#appendix-C
  return year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0)
}

const DATE = /^(\d\d\d\d)-(\d\d)-(\d\d)$/
const DAYS = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

function date(str: string): boolean {
  // full-date from http://tools.ietf.org/html/rfc3339#section-5.6
  const matches: string[] | null = DATE.exec(str)
  if (!matches) return false
  const year: number = +matches[1]
  const month: number = +matches[2]
  const day: number = +matches[3]
  return (
    month >= 1 &&
    month <= 12 &&
    day >= 1 &&
    day <= (month === 2 && isLeapYear(year) ? 29 : DAYS[month])
  )
}

function compareDate(d1: string, d2: string): number | undefined {
  if (!(d1 && d2)) return undefined
  if (d1 > d2) return 1
  if (d1 < d2) return -1
  return 0
}

const TIME = /^(\d\d):(\d\d):(\d\d)(\.\d+)?(z|[+-]\d\d(?::?\d\d)?)?$/i

function time(str: string, withTimeZone?: boolean): boolean {
  const matches: string[] | null = TIME.exec(str)
  if (!matches) return false

  const hour: number = +matches[1]
  const minute: number = +matches[2]
  const second: number = +matches[3]
  const timeZone: string = matches[5]
  return (
    ((hour <= 23 && minute <= 59 && second <= 59) ||
      (hour === 23 && minute === 59 && second === 60)) &&
    (!withTimeZone || timeZone !== "")
  )
}

function compareTime(t1: string, t2: string): number | undefined {
  if (!(t1 && t2)) return undefined
  const a1 = TIME.exec(t1)
  const a2 = TIME.exec(t2)
  if (!(a1 && a2)) return undefined
  t1 = a1[1] + a1[2] + a1[3] + (a1[4] || "")
  t2 = a2[1] + a2[2] + a2[3] + (a2[4] || "")
  if (t1 > t2) return 1
  if (t1 < t2) return -1
  return 0
}

const DATE_TIME_SEPARATOR = /t|\s/i
function date_time(str: string): boolean {
  // http://tools.ietf.org/html/rfc3339#section-5.6
  const dateTime: string[] = str.split(DATE_TIME_SEPARATOR)
  return dateTime.length === 2 && date(dateTime[0]) && time(dateTime[1], true)
}

function compareDateTime(dt1: string, dt2: string): number | undefined {
  if (!(dt1 && dt2)) return undefined
  const [d1, t1] = dt1.split(DATE_TIME_SEPARATOR)
  const [d2, t2] = dt2.split(DATE_TIME_SEPARATOR)
  const res = compareDate(d1, d2)
  if (res === undefined) return undefined
  return res || compareTime(t1, t2)
}

const NOT_URI_FRAGMENT = /\/|:/
const URI =
  /^(?:[a-z][a-z0-9+\-.]*:)(?:\/?\/(?:(?:[a-z0-9\-._~!$&'()*+,;=:]|%[0-9a-f]{2})*@)?(?:\[(?:(?:(?:(?:[0-9a-f]{1,4}:){6}|::(?:[0-9a-f]{1,4}:){5}|(?:[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){4}|(?:(?:[0-9a-f]{1,4}:){0,1}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){3}|(?:(?:[0-9a-f]{1,4}:){0,2}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){2}|(?:(?:[0-9a-f]{1,4}:){0,3}[0-9a-f]{1,4})?::[0-9a-f]{1,4}:|(?:(?:[0-9a-f]{1,4}:){0,4}[0-9a-f]{1,4})?::)(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?))|(?:(?:[0-9a-f]{1,4}:){0,5}[0-9a-f]{1,4})?::[0-9a-f]{1,4}|(?:(?:[0-9a-f]{1,4}:){0,6}[0-9a-f]{1,4})?::)|[Vv][0-9a-f]+\.[a-z0-9\-._~!$&'()*+,;=:]+)\]|(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)|(?:[a-z0-9\-._~!$&'()*+,;=]|%[0-9a-f]{2})*)(?::\d*)?(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})*)*|\/(?:(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})+(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})*)*)?|(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})+(?:\/(?:[a-z0-9\-._~!$&'()*+,;=:@]|%[0-9a-f]{2})*)*)(?:\?(?:[a-z0-9\-._~!$&'()*+,;=:@/?]|%[0-9a-f]{2})*)?(?:#(?:[a-z0-9\-._~!$&'()*+,;=:@/?]|%[0-9a-f]{2})*)?$/i

function uri(str: string): boolean {
  // http://jmrware.com/articles/2009/uri_regexp/URI_regex.html + optional protocol + required "."
  return NOT_URI_FRAGMENT.test(str) && URI.test(str)
}

const BYTE = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/gm

function byte(str: string): boolean {
  BYTE.lastIndex = 0
  return BYTE.test(str)
}

const MIN_INT32 = -(2 ** 31)
const MAX_INT32 = 2 ** 31 - 1

function validateInt32(value: number): boolean {
  return Number.isInteger(value) && value <= MAX_INT32 && value >= MIN_INT32
}

function validateInt64(value: number): boolean {
  // JSON and javascript max Int is 2**53, so any int that passes isInteger is valid for Int64
  return Number.isInteger(value)
}

function validateNumber(): boolean {
  return true
}

const Z_ANCHOR = /[^\\]\\Z/
function regex(str: string): boolean {
  if (Z_ANCHOR.test(str)) return false
  try {
    new RegExp(str)
    return true
  } catch (e) {
    return false
  }
}