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/*
Copyright 2012 Twitter, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.twitter.scalding

import java.util.Calendar
import java.util.Date
import java.util.TimeZone
import java.text.SimpleDateFormat

import scala.util.matching.Regex

/**
 * Holds some coversion functions for dealing with strings as RichDate objects
 */
object DateOps extends java.io.Serializable {
  val PACIFIC = TimeZone.getTimeZone("America/Los_Angeles")
  val UTC = TimeZone.getTimeZone("UTC")

  val DATE_WITH_DASH = "yyyy-MM-dd"
  val DATEHOUR_WITH_DASH = "yyyy-MM-dd HH"
  val DATETIME_WITH_DASH = "yyyy-MM-dd HH:mm"
  val DATETIME_HMS_WITH_DASH = "yyyy-MM-dd HH:mm:ss"
  val DATETIME_HMSM_WITH_DASH = "yyyy-MM-dd HH:mm:ss.SSS"

  private val DATE_RE = """\d{4}-\d{2}-\d{2}"""
  private val SEP_RE = """(T?|\s*)"""
  private val DATE_FORMAT_VALIDATORS = List(DATE_WITH_DASH -> new Regex("""^\s*""" + DATE_RE + """\s*$"""),
    DATEHOUR_WITH_DASH -> new Regex("""^\s*""" + DATE_RE +
      SEP_RE + """\d\d\s*$"""),
    DATETIME_WITH_DASH -> new Regex("""^\s*""" + DATE_RE +
      SEP_RE + """\d\d:\d\d\s*$"""),
    DATETIME_HMS_WITH_DASH -> new Regex("""^\s*""" + DATE_RE +
      SEP_RE + """\d\d:\d\d:\d\d\s*$"""),
    DATETIME_HMSM_WITH_DASH -> new Regex("""^\s*""" + DATE_RE +
      SEP_RE + """\d\d:\d\d:\d\d\.\d{1,3}\s*$"""))
  private val prepare: String => String = { (str: String) =>
    str.replace("T", " ") //We allow T to separate dates and times, just remove it and then validate
      .replaceAll("[/_]", "-") // Allow for slashes and underscores
  }
  /**
   * Return the guessed format for this datestring
   */
  def getFormat(s: String): Option[String] = {
    DATE_FORMAT_VALIDATORS.find{ _._2.findFirstIn(prepare(s)).isDefined }.map(_._1)
  }

  def getDateParser(s: String): Option[DateParser] =
    getFormat(s).map { fmt => DateParser.from(new SimpleDateFormat(fmt)).contramap(prepare) }
}