// See LICENSE for license details.

package firrtlTests
package transforms

import firrtl._
import firrtl.RenameMap
import firrtl.annotations._
import firrtl.transforms.{DedupModules, NoCircuitDedupAnnotation}
import firrtl.testutils._

/**
 * Tests inline instances transformation
 */
class DedupModuleTests extends HighTransformSpec {
  case class MultiTargetDummyAnnotation(targets: Seq[Target], tag: Int) extends Annotation {
    override def update(renames: RenameMap): Seq[Annotation] = {
      val newTargets = targets.flatMap(renames(_))
      Seq(MultiTargetDummyAnnotation(newTargets, tag))
    }
  }
  case class SingleTargetDummyAnnotation(target: ComponentName) extends SingleTargetAnnotation[ComponentName] {
    override def duplicate(n: ComponentName): Annotation = SingleTargetDummyAnnotation(n)
  }
  def transform = new DedupModules
  "The module A" should "be deduped" in {
     val input =
        """circuit Top :
          |  module Top :
          |    inst a1 of A
          |    inst a2 of A_
          |  module A :
          |    output x: UInt<1>
          |    x <= UInt(1)
          |  module A_ :
          |    output x: UInt<1>
          |    x <= UInt(1)
          """.stripMargin
     val check =
        """circuit Top :
          |  module Top :
          |    inst a1 of A
          |    inst a2 of A
          |  module A :
          |    output x: UInt<1>
          |    x <= UInt(1)
          """.stripMargin
     execute(input, check, Seq.empty)
  }
  "The module A and B" should "be deduped" in {
     val input =
        """circuit Top :
          |  module Top :
          |    inst a1 of A
          |    inst a2 of A_
          |  module A :
          |    output x: UInt<1>
          |    inst b of B
          |    x <= b.x
          |  module A_ :
          |    output x: UInt<1>
          |    inst b of B_
          |    x <= b.x
          |  module B :
          |    output x: UInt<1>
          |    x <= UInt(1)
          |  module B_ :
          |    output x: UInt<1>
          |    x <= UInt(1)
          """.stripMargin
     val check =
        """circuit Top :
          |  module Top :
          |    inst a1 of A
          |    inst a2 of A
          |  module A :
          |    output x: UInt<1>
          |    inst b of B
          |    x <= b.x
          |  module B :
          |    output x: UInt<1>
          |    x <= UInt(1)
          """.stripMargin
     execute(input, check, Seq.empty)
  }
  "The module A and B with comments" should "be deduped" in {
     val input =
        """circuit Top :
          |  module Top :
          |    inst a1 of A
          |    inst a2 of A_
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    inst b of B @[yy 2:2]
          |    x <= b.x @[yy 2:2]
          |  module A_ : @[xx 1:1]
          |    output x: UInt<1> @[xx 1:1]
          |    inst b of B_ @[xx 1:1]
          |    x <= b.x @[xx 1:1]
          |  module B :
          |    output x: UInt<1>
          |    x <= UInt(1)
          |  module B_ :
          |    output x: UInt<1>
          |    x <= UInt(1)
          """.stripMargin
     val check =
        """circuit Top :
          |  module Top :
          |    inst a1 of A
          |    inst a2 of A
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    inst b of B @[yy 2:2]
          |    x <= b.x @[yy 2:2]
          |  module B :
          |    output x: UInt<1>
          |    x <= UInt(1)
          """.stripMargin
     execute(input, check, Seq.empty)
  }
  "A_ but not A" should "be deduped if not annotated" in {
     val input =
        """circuit Top :
          |  module Top :
          |    inst a1 of A
          |    inst a2 of A_
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    x <= UInt(1)
          |  module A_ : @[xx 1:1]
          |    output x: UInt<1> @[xx 1:1]
          |    x <= UInt(1)
          """.stripMargin
     val check =
        """circuit Top :
          |  module Top :
          |    inst a1 of A
          |    inst a2 of A_
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    x <= UInt(1)
          |  module A_ : @[xx 1:1]
          |    output x: UInt<1> @[xx 1:1]
          |    x <= UInt(1)
          """.stripMargin
     execute(input, check, Seq(dontDedup("A")))
  }
  "The module A and A_" should "be deduped even with different port names and info, and annotations should remapped" in {
     val input =
        """circuit Top :
          |  module Top :
          |    output out: UInt<1>
          |    inst a1 of A
          |    inst a2 of A_
          |    out <= and(a1.x, a2.y)
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    x <= UInt(1)
          |  module A_ : @[xx 1:1]
          |    output y: UInt<1> @[xx 1:1]
          |    y <= UInt(1)
        """.stripMargin
     val check =
        """circuit Top :
          |  module Top :
          |    output out: UInt<1>
          |    inst a1 of A
          |    inst a2 of A
          |    out <= and(a1.x, a2.x)
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    x <= UInt(1)
        """.stripMargin

     val mname = ModuleName("Top", CircuitName("Top"))
     val finalState = execute(input, check, Seq(SingleTargetDummyAnnotation(ComponentName("a2.y", mname))))
     finalState.annotations.collect({ case d: SingleTargetDummyAnnotation => d }).head should be(SingleTargetDummyAnnotation(ComponentName("a2.x", mname)))
  }

  "Extmodules" should "with the same defname and parameters should dedup" in {
     val input =
        """circuit Top :
          |  module Top :
          |    output out: UInt<1>
          |    inst a1 of A
          |    inst a2 of A_
          |    out <= and(a1.x, a2.y)
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    inst b of B
          |    x <= b.u
          |  module A_ : @[xx 1:1]
          |    output y: UInt<1> @[xx 1:1]
          |    inst c of C
          |    y <= c.v
          |  extmodule B : @[aa 3:3]
          |    output u : UInt<1> @[aa 4:4]
          |    defname = BB
          |    parameter N = 0
          |  extmodule C : @[bb 5:5]
          |    output v : UInt<1> @[bb 6:6]
          |    defname = BB
          |    parameter N = 0
        """.stripMargin
     val check =
        """circuit Top :
          |  module Top :
          |    output out: UInt<1>
          |    inst a1 of A
          |    inst a2 of A
          |    out <= and(a1.x, a2.x)
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    inst b of B
          |    x <= b.u
          |  extmodule B : @[aa 3:3]
          |    output u : UInt<1> @[aa 4:4]
          |    defname = BB
          |    parameter N = 0
        """.stripMargin

     execute(input, check, Seq.empty)
  }

  "Extmodules" should "with the different defname or parameters should NOT dedup" in {
     def mkfir(defnames: (String, String), params: (String, String)) =
       s"""circuit Top :
          |  module Top :
          |    output out: UInt<1>
          |    inst a1 of A
          |    inst a2 of A_
          |    out <= and(a1.x, a2.y)
          |  module A : @[yy 2:2]
          |    output x: UInt<1> @[yy 2:2]
          |    inst b of B
          |    x <= b.u
          |  module A_ : @[xx 1:1]
          |    output y: UInt<1> @[xx 1:1]
          |    inst c of C
          |    y <= c.v
          |  extmodule B : @[aa 3:3]
          |    output u : UInt<1> @[aa 4:4]
          |    defname = ${defnames._1}
          |    parameter N = ${params._1}
          |  extmodule C : @[bb 5:5]
          |    output v : UInt<1> @[bb 6:6]
          |    defname = ${defnames._2}
          |    parameter N = ${params._2}
        """.stripMargin
     val diff_defname = mkfir(("BB", "CC"), ("0", "0"))
     execute(diff_defname, diff_defname, Seq.empty)
     val diff_params = mkfir(("BB", "BB"), ("0", "1"))
     execute(diff_params, diff_params, Seq.empty)
  }
  "The module A and B" should "be deduped with the first module in order" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A_
        |  module A :
        |    output x: UInt<1>
        |    inst b of B
        |    x <= b.x
        |  module A_ :
        |    output x: UInt<1>
        |    inst b of B_
        |    x <= b.x
        |  module B :
        |    output x: UInt<1>
        |    x <= UInt(1)
        |  module B_ :
        |    output x: UInt<1>
        |    x <= UInt(1)
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    output x: UInt<1>
        |    inst b of B
        |    x <= b.x
        |  module B :
        |    output x: UInt<1>
        |    x <= UInt(1)
      """.stripMargin
    execute(input, check, Seq.empty)
  }

  "The module A and A_" should "be deduped with fields that sort of match" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A_
        |  module A :
        |    output x: UInt<1>
        |    wire b: {c: UInt<1>}
        |    x <= b.c
        |  module A_ :
        |    output x: UInt<1>
        |    wire b: {b: UInt<1>}
        |    x <= b.b
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    output x: UInt<1>
        |    wire b: {c: UInt<1>}
        |    x <= b.c
      """.stripMargin
    execute(input, check, Seq.empty)
  }

  "The module A and A_" should "dedup with different annotation targets" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A_
        |  module A :
        |    output x: UInt<1>
        |    wire b: UInt<1>
        |    x <= b
        |  module A_ :
        |    output x: UInt<1>
        |    wire b: UInt<1>
        |    x <= b
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    output x: UInt<1>
        |    wire b: UInt<1>
        |    x <= b
      """.stripMargin
    execute(input, check, Seq(dontTouch("A.b")))
  }

  "The module A and A_" should "be deduped with same annotation targets" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A_
        |  module A :
        |    output x: UInt<1>
        |    wire b: UInt<1>
        |    x <= b
        |  module A_ :
        |    output x: UInt<1>
        |    wire b: UInt<1>
        |    x <= b
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    output x: UInt<1>
        |    wire b: UInt<1>
        |    x <= b
      """.stripMargin
    val cs = execute(input, check, Seq(
      dontTouch(ReferenceTarget("Top", "A", Nil, "b", Nil)),
      dontTouch(ReferenceTarget("Top", "A_", Nil, "b", Nil))
    ))
    cs.annotations.toSeq should contain (dontTouch(ModuleTarget("Top", "Top").instOf("a1", "A").ref("b")))
    cs.annotations.toSeq should contain (dontTouch(ModuleTarget("Top", "Top").instOf("a2", "A").ref("b")))
    cs.annotations.toSeq should not contain dontTouch(ReferenceTarget("Top", "A_", Nil, "b", Nil))
  }
  "The module A and A_" should "be deduped with same annotation targets when there are a lot" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A_
        |  module A :
        |    output x: UInt<1>[100]
        |    wire b: UInt<1>[100]
        |    x <= b
        |  module A_ :
        |    output x: UInt<1>[100]
        |    wire b: UInt<1>[100]
        |    x <= b
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    output x: UInt<1>[100]
        |    wire b: UInt<1>[100]
        |    x <= b
      """.stripMargin
    val annos = (0 until 100).flatMap(i => Seq(dontTouch(s"A.b[$i]"), dontTouch(s"A_.b[$i]")))
    execute(input, check, annos)
  }
  "The module A and A_" should "be deduped with same annotations with same multi-targets" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A_
        |  module A :
        |    output x: UInt<1>
        |    inst b of B
        |    x <= b.x
        |  module A_ :
        |    output x: UInt<1>
        |    inst b of B_
        |    x <= b.x
        |  module B :
        |    output x: UInt<1>
        |    x <= UInt(1)
        |  module B_ :
        |    output x: UInt<1>
        |    x <= UInt(1)
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    output x: UInt<1>
        |    inst b of B
        |    x <= b.x
        |  module B :
        |    output x: UInt<1>
        |    x <= UInt(1)
      """.stripMargin
    val Top = CircuitTarget("Top")
    val A = Top.module("A")
    val B = Top.module("B")
    val A_ = Top.module("A_")
    val B_ = Top.module("B_")
    val Top_a1 = Top.module("Top").instOf("a1", "A")
    val Top_a2 = Top.module("Top").instOf("a2", "A")
    val Top_a1_b = Top_a1.instOf("b", "B")
    val Top_a2_b = Top_a2.instOf("b", "B")
    val annoAB = MultiTargetDummyAnnotation(Seq(A, B), 0)
    val annoA_B_ = MultiTargetDummyAnnotation(Seq(A_, B_), 1)
    val cs = execute(input, check, Seq(annoAB, annoA_B_))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      Top_a1, Top_a1_b
    ), 0))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      Top_a2, Top_a2_b
    ), 1))
  }
  "The module A and A_" should "be deduped with same annotations with same multi-targets, that share roots" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A_
        |  module A :
        |    output x: UInt<1>
        |    inst b of B
        |    x <= b.x
        |  module A_ :
        |    output x: UInt<1>
        |    inst b of B_
        |    x <= b.x
        |  module B :
        |    output x: UInt<1>
        |    x <= UInt(1)
        |  module B_ :
        |    output x: UInt<1>
        |    x <= UInt(1)
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    output x: UInt<1>
        |    inst b of B
        |    x <= b.x
        |  module B :
        |    output x: UInt<1>
        |    x <= UInt(1)
      """.stripMargin
    val Top = CircuitTarget("Top")
    val A = Top.module("A")
    val A_ = Top.module("A_")
    val annoA = MultiTargetDummyAnnotation(Seq(A, A.instOf("b", "B")), 0)
    val annoA_ = MultiTargetDummyAnnotation(Seq(A_, A_.instOf("b", "B_")), 1)
    val cs = execute(input, check, Seq(annoA, annoA_))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      Top.module("Top").instOf("a1", "A"),
      Top.module("Top").instOf("a1", "A").instOf("b", "B")
    ),0))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      Top.module("Top").instOf("a2", "A"),
      Top.module("Top").instOf("a2", "A").instOf("b", "B")
    ),1))
    cs.deletedAnnotations.isEmpty should be (true)
  }
  "The deduping module A and A_" should "rename internal signals that have different names" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    a1 is invalid
        |    inst a2 of A_
        |    a2 is invalid
        |  module A :
        |    input x: UInt<1>
        |    output y: UInt<1>
        |    node a = add(x, UInt(1))
        |    y <= add(a, a)
        |  module A_ :
        |    input x: UInt<1>
        |    output y: UInt<1>
        |    node b = add(x, UInt(1))
        |    y <= add(b, b)
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a1 of A
        |    a1 is invalid
        |    inst a2 of A
        |    a2 is invalid
        |  module A :
        |    input x: UInt<1>
        |    output y: UInt<1>
        |    node a = add(x, UInt<1>("h1"))
        |    y <= add(a, a)
      """.stripMargin
    val Top = CircuitTarget("Top")
    val A = Top.module("A")
    val A_ = Top.module("A_")
    val annoA  = SingleTargetDummyAnnotation(A.ref("a"))
    val annoA_ = SingleTargetDummyAnnotation(A_.ref("b"))
    val cs = execute(input, check, Seq(annoA, annoA_))
    cs.annotations.toSeq should contain (annoA)
    cs.annotations.toSeq should not contain (SingleTargetDummyAnnotation(A.ref("b")))
    cs.deletedAnnotations.isEmpty should be (true)
  }
  "main" should "not be deduped even if it's the last module" in {
    val input =
      """circuit main:
        |  module dupe:
        |    input in: UInt<8>
        |    output out: UInt<8>
        |    out <= in
        |  module main:
        |    input in:  UInt<8>
        |    output out: UInt<8>
        |    out <= in
      """.stripMargin
    val check =
      """circuit main:
        |  module dupe:
        |    input in: UInt<8>
        |    output out: UInt<8>
        |    out <= in
        |  module main:
        |    input in:  UInt<8>
        |    output out: UInt<8>
        |    out <= in
      """.stripMargin
    execute(input, check, Seq.empty)
  }
  "modules" should "not be deduped if the NoCircuitDedupAnnotation (or --no-dedup option) is supplied" in {
    val input =
      """circuit main:
        |  module dupe:
        |    input in: UInt<8>
        |    output out: UInt<8>
        |    out <= in
        |  module main:
        |    input in:  UInt<8>
        |    output out: UInt<8>
        |    out <= in
      """.stripMargin
    val check =
      """circuit main:
        |  module dupe:
        |    input in: UInt<8>
        |    output out: UInt<8>
        |    out <= in
        |  module main:
        |    input in:  UInt<8>
        |    output out: UInt<8>
        |    out <= in
      """.stripMargin
    execute(input, check, Seq(NoCircuitDedupAnnotation))
  }

  "The deduping module A and A_" should "rename instances and signals that have different names" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a of A
        |    inst a_ of A_
        |  module A :
        |    inst b of B
        |  module A_ :
        |    inst b_ of B_
        |  module B :
        |    node foo = UInt<1>(0)
        |  module B_ :
        |    node bar = UInt<1>(0)
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a of A
        |    inst a_ of A
        |  module A :
        |    inst b of B
        |  module B :
        |    node foo = UInt<1>(0)
      """.stripMargin
    val Top = CircuitTarget("Top")
    val inst1 = Top.module("Top").instOf("a", "A").instOf("b", "B")
    val inst2 = Top.module("Top").instOf("a_", "A_").instOf("b_", "B_")
    val ref1 = Top.module("Top").instOf("a", "A").instOf("b", "B").ref("foo")
    val ref2 = Top.module("Top").instOf("a_", "A_").instOf("b_", "B_").ref("bar")
    val anno1 = MultiTargetDummyAnnotation(Seq(inst1, ref1), 0)
    val anno2 = MultiTargetDummyAnnotation(Seq(inst2, ref2), 1)
    val cs = execute(input, check, Seq(anno1, anno2))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      inst1, ref1
    ),0))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      Top.module("Top").instOf("a_", "A").instOf("b", "B"),
      Top.module("Top").instOf("a_", "A").instOf("b", "B").ref("foo")
    ),1))
    cs.deletedAnnotations.isEmpty should be (true)
  }

  "The deduping module A and A_" should "rename nested instances that have different names" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst a of A
        |    inst a_ of A_
        |  module A :
        |    inst b of B
        |  module A_ :
        |    inst b_ of B_
        |  module B :
        |    inst c of C
        |  module B_ :
        |    inst c_ of C_
        |  module C :
        |    inst d of D
        |  module C_ :
        |    inst d_ of D_
        |  module D :
        |    node foo = UInt<1>(0)
        |  module D_ :
        |    node bar = UInt<1>(0)
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst a of A
        |    inst a_ of A
        |  module A :
        |    inst b of B
        |  module B :
        |    inst c of C
        |  module C :
        |    inst d of D
        |  module D :
        |    node foo = UInt<1>(0)
      """.stripMargin
    val Top = CircuitTarget("Top")
    val inst1 = Top.module("Top").instOf("a", "A").instOf("b", "B").instOf("c", "C").instOf("d", "D")
    val inst2 = Top.module("Top").instOf("a_", "A_").instOf("b_", "B_").instOf("c_", "C_").instOf("d_", "D_")
    val ref1 = Top.module("Top").instOf("a", "A").instOf("b", "B").instOf("c", "C").instOf("d", "D").ref("foo")
    val ref2 = Top.module("Top").instOf("a_", "A_").instOf("b_", "B_").instOf("c_", "C_").instOf("d_", "D_").ref("bar")
    val anno1 = MultiTargetDummyAnnotation(Seq(inst1, ref1), 0)
    val anno2 = MultiTargetDummyAnnotation(Seq(inst2, ref2), 1)
    val cs = execute(input, check, Seq(anno1, anno2))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      inst1, ref1
    ),0))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      Top.module("Top").instOf("a_", "A").instOf("b", "B").instOf("c", "C").instOf("d", "D"),
      Top.module("Top").instOf("a_", "A").instOf("b", "B").instOf("c", "C").instOf("d", "D").ref("foo")
    ),1))
    cs.deletedAnnotations.isEmpty should be (true)
  }

  "Deduping modules with multiple instances" should "corectly rename instances" in {
    val input =
      """circuit Top :
        |  module Top :
        |    inst b of B
        |    inst b_ of B_
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    inst b of B
        |    inst b_ of B_
        |  module B :
        |    inst c of C
        |  module B_ :
        |    inst c of C
        |  module C :
        |    skip
      """.stripMargin
    val check =
      """circuit Top :
        |  module Top :
        |    inst b of B
        |    inst b_ of B
        |    inst a1 of A
        |    inst a2 of A
        |  module A :
        |    inst b of B
        |    inst b_ of B
        |  module B :
        |    inst c of C
        |  module C :
        |    skip
      """.stripMargin
    val Top = CircuitTarget("Top").module("Top")
    val bInstances = Seq(
      Top.instOf("b", "B"),
      Top.instOf("b_", "B_"),
      Top.instOf("a1", "A").instOf("b_", "B_"),
      Top.instOf("a2", "A").instOf("b_", "B_"),
      Top.instOf("a1", "A").instOf("b", "B"),
      Top.instOf("a2", "A").instOf("b", "B")
    )
    val cInstances = bInstances.map(_.instOf("c", "C"))
    val annos = MultiTargetDummyAnnotation(bInstances ++ cInstances, 0)
    val cs = execute(input, check, Seq(annos))
    cs.annotations.toSeq should contain (MultiTargetDummyAnnotation(Seq(
      Top.instOf("b", "B"),
      Top.instOf("b_", "B"),
      Top.instOf("a1", "A").instOf("b_", "B"),
      Top.instOf("a2", "A").instOf("b_", "B"),
      Top.instOf("a1", "A").instOf("b", "B"),
      Top.instOf("a2", "A").instOf("b", "B"),
      Top.instOf("b", "B").instOf("c", "C"),
      Top.instOf("b_", "B").instOf("c", "C"),
      Top.instOf("a1", "A").instOf("b_", "B").instOf("c", "C"),
      Top.instOf("a2", "A").instOf("b_", "B").instOf("c", "C"),
      Top.instOf("a1", "A").instOf("b", "B").instOf("c", "C"),
      Top.instOf("a2", "A").instOf("b", "B").instOf("c", "C")
    ),0))
    cs.deletedAnnotations.isEmpty should be (true)
  }

  "dedup" should "properly rename target components after retyping" in {
    val input = """
      |circuit top:
      |  module top:
      |    input ia: {z: {y: {x: UInt<1>}}, a: UInt<1>}
      |    input ib: {a: {b: {c: UInt<1>}}, z: UInt<1>}
      |    output oa: {z: {y: {x: UInt<1>}}, a: UInt<1>}
      |    output ob: {a: {b: {c: UInt<1>}}, z: UInt<1>}
      |    inst a of a
      |    a.i <= ia
      |    oa <= a.o
      |    inst b of b
      |    b.q <= ib
      |    ob <= b.r
      |  module a:
      |    input i: {z: {y: {x: UInt<1>}}, a: UInt<1>}
      |    output o: {z: {y: {x: UInt<1>}}, a: UInt<1>}
      |    o <= i
      |  module b:
      |    input q: {a: {b: {c: UInt<1>}}, z: UInt<1>}
      |    output r: {a: {b: {c: UInt<1>}}, z: UInt<1>}
      |    r <= q
      |""".stripMargin

    case class DummyRTAnnotation(target: ReferenceTarget) extends SingleTargetAnnotation[ReferenceTarget] {
      def duplicate(n: ReferenceTarget) = DummyRTAnnotation(n)
    }

    val annA = DummyRTAnnotation(ReferenceTarget("top", "a", Nil, "i", Seq(TargetToken.Field("a"))))
    val annB = DummyRTAnnotation(ReferenceTarget("top", "b", Nil, "q", Seq(TargetToken.Field("a"))))


    val cs = CircuitState(Parser.parseString(input, Parser.IgnoreInfo), Seq(annA, annB))

    val deduper = new stage.transforms.Compiler(stage.Forms.Deduped, Nil)
    val csDeduped = deduper.execute(cs)

    /*
     During dedup, input q of b gets "retyped." The connections get updated to reflect this
     retyping, and annotations with a non-empty "component" must get renamed to reflect this
     retyping. Since the "retyping" maps b.q.a onto a.i.z in its structural significance and
     connection, and since failure to rename "component" will result in annotations that are
     fundamentally illegal, the deduplication of these modules (if it occurs) must include a rename
     mapping from ~top|b>q.a to ~top|a>i.z to best capture the retyping.
     */
    val aPath = Seq((TargetToken.Instance("a"), TargetToken.OfModule("a")))
    val bPath = Seq((TargetToken.Instance("b"), TargetToken.OfModule("a")))
    val expectedAnnA = DummyRTAnnotation(ReferenceTarget("top", "top", aPath, "i", Seq(TargetToken.Field("a"))))
    val expectedAnnB = DummyRTAnnotation(ReferenceTarget("top", "top", aPath, "i", Seq(TargetToken.Field("a"))))
    csDeduped.annotations.toSeq should contain (expectedAnnA)
    csDeduped.annotations.toSeq should contain (expectedAnnB)
  }
}

