package scala.util.matching

import org.junit.Assert._
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4

import scala.tools.testing.AssertUtil._

@RunWith(classOf[JUnit4])
class RegexTest {
  @Test def t8022CharSequence(): Unit = {
    val full = """.*: (.)$""".r
    val text = "   When I use this operator: *"
    // Testing 2.10.x compatibility of the return types of unapplySeq
    val x :: Nil = full.unapplySeq(text: Any).get
    val y :: Nil = full.unapplySeq(text: CharSequence).get
    assertEquals("*", x)
    assertEquals("*", y)
  }

  @Test def t8022Match(): Unit = {
    val R = """(\d)""".r
    val matchh = R.findFirstMatchIn("a1").get
    // Testing 2.10.x compatibility of the return types of unapplySeq
    val x :: Nil = R.unapplySeq(matchh: Any).get
    val y :: Nil = R.unapplySeq(matchh).get
    assertEquals("1", x)
    assertEquals("1", y)
  }

  @Test def t8787nullMatch() = {
    val r = """\d+""".r
    val s: String = null
    val x = s match { case r() => 1 ; case _ => 2 }
    assertEquals(2, x)
  }

  @Test def t8787nullMatcher() = {
    val r = """(\d+):(\d+)""".r
    val s = "1:2 3:4 5:6"
    val z = ((r findAllMatchIn s).toList :+ null) flatMap {
      case r(x, y) => Some((x.toInt, y.toInt))
      case _       => None
    }
    assertEquals(List((1,2),(3,4),(5,6)), z)
  }

  @Test def `SI-9666: use inline group names`(): Unit = {
    val r = new Regex("a(?<Bee>b*)c")
    val ms = r findAllIn "stuff abbbc more abc and so on"
    assertTrue(ms.hasNext)
    assertEquals("abbbc", ms.next())
    assertEquals("bbb", ms group "Bee")
    assertTrue(ms.hasNext)
    assertEquals("abc", ms.next())
    assertEquals("b", ms group "Bee")
    assertFalse(ms.hasNext)
  }

  @Test def `SI-9666: use explicit group names`(): Unit = {
    val r = new Regex("a(b*)c", "Bee")
    val ms = r findAllIn "stuff abbbc more abc and so on"
    assertTrue(ms.hasNext)
    assertEquals("abbbc", ms.next())
    assertEquals("bbb", ms group "Bee")
    assertTrue(ms.hasNext)
    assertEquals("abc", ms.next())
    assertEquals("b", ms group "Bee")
    assertFalse(ms.hasNext)
  }

  @Test def `SI-9666: fall back to explicit group names`(): Unit = {
    val r = new Regex("a(?<Bar>b*)c", "Bee")
    val ms = r findAllIn "stuff abbbc more abc and so on"
    assertTrue(ms.hasNext)
    assertEquals("abbbc", ms.next())
    assertEquals("bbb", ms group "Bee")
    assertEquals("bbb", ms group "Bar")
    assertTrue(ms.hasNext)
    assertEquals("abc", ms.next())
    assertEquals("b", ms group "Bee")
    assertEquals("b", ms group "Bar")
    assertFalse(ms.hasNext)
  }

  type NoGroup = IllegalArgumentException
  type NoMatch = NoSuchElementException
  type NoData  = IllegalStateException

  @Test def `SI-9666: throw on bad name`(): Unit = {
    assertThrows[NoGroup] {
      val r = new Regex("a(?<Bar>b*)c")
      val ms = r findAllIn "stuff abbbc more abc and so on"
      assertTrue(ms.hasNext)
      ms group "Bee"
    }
    assertThrows[NoGroup] {
      val r = new Regex("a(?<Bar>b*)c", "Bar")
      val ms = r findAllIn "stuff abbbc more abc and so on"
      assertTrue(ms.hasNext)
      ms group "Bee"
    }
    assertThrows[NoGroup] {
      val r = new Regex("a(b*)c", "Bar")
      val ms = r findAllIn "stuff abbbc more abc and so on"
      assertTrue(ms.hasNext)
      ms group "Bee"
    }
  }

  @Test def `SI-9827 MatchIterator ergonomics`(): Unit = {
    val r = "(ab)(cd)".r
    val s = "xxxabcdyyyabcdzzz"
    assertEquals(3, r.findAllIn(s).start)
    assertEquals(5, r.findAllIn(s).start(2))
    locally {
      val mi = r.findAllIn(s)
      assertTrue(mi.hasNext)
      assertEquals(3, mi.start)
      assertEquals("abcd", mi.next())
      assertEquals(3, mi.start)
      assertTrue(mi.hasNext)
      assertEquals(10, mi.start)
    }
    locally {
      val mi = r.findAllIn(s)
      assertEquals("abcd", mi.next())
      assertEquals(3, mi.start)
      assertEquals("abcd", mi.next())
      assertEquals(10, mi.start)
      assertThrows[NoMatch] { mi.next() }
      assertThrows[NoData] { mi.start }
    }
    locally {
      val mi = r.findAllIn("")
      assertThrows[NoData] { mi.start }
      assertThrows[NoMatch] { mi.next() }
    }
    locally {
      val mi = r.findAllMatchIn(s)
      val x = mi.next()
      assertEquals("abcd", x.matched)
      assertEquals(3, x.start)
      val y = mi.next()
      assertEquals("abcd", y.matched)
      assertEquals(10, y.start)
      assertThrows[NoMatch] { mi.next() }
      assertEquals(3, x.start)
      assertEquals(10, y.start)
    }
    locally {
      val regex = "(foo)-(.*)".r
      val s = "foo-abc-def"
      val result = regex.findAllIn(s)
      //result.toString // comment this line to make it not work
      val r = (result.group(1), result.group(2))
      assertEquals(("foo", "abc-def"), r)
    }
    locally {
      val t = "this is a test"
      val rx = " ".r
      val m = rx.findAllIn(t)
      assertEquals(5, rx.findAllIn(t).end)
    }
    locally {
      val data = "<a>aaaaa</a><b>bbbbbb</b><c>ccccccc</c>"
      val p = "^<a>(.+)</a><b>(.+)</b><c>(.+)</c>$".r
      val parts = p.findAllIn(data)
      val aes = parts.group(1)
      val bes = parts.group(2)
      val ces = parts.group(3)
      assertEquals("ccccccc", ces)
      assertEquals("bbbbbb", bes)
      assertEquals("aaaaa", aes)
    }
  }
}