% # This template was extracted from the Arrays.swift.gyb in order to split
% # that file into multiple to parallelize test execution.
%
% # Template caller should define the following context:
% #   - Suite -- an identifier for the test suite to append tests to.
% #   - ArrayType -- the type being tested.


extension ${ArrayType} {
  typealias _BufferID = UnsafeRawPointer?
  var _bufferID: _BufferID {
    return unsafeBitCast(_owner, to: _BufferID.self)
  }
}

protocol TestProtocol1 {}

extension ${ArrayType} where Element : TestProtocol1 {
  var _elementIsTestProtocol1: Bool {
    fatalError("not implemented")
  }
}

/// Returns an ${ArrayType} that does not share its buffer with other arrays.
func getFresh${ArrayType}<S : Sequence>(_ sequence: S)
  -> ${ArrayType}<S.Iterator.Element> {
  var result: ${ArrayType}<S.Iterator.Element> = []
  result.reserveCapacity(sequence.underestimatedCount)
  for element in sequence {
    result.append(element)
  }
  return result
}

struct SequenceWithCustomUnderestimatedCount : Sequence {
  init(_ data: [Int]) {
    self._data = MinimalSequence(elements: data.map(OpaqueValue.init))
  }

  func makeIterator() -> MinimalSequence<OpaqueValue<Int>>.Iterator {
    return _data.makeIterator()
  }

  var underestimatedCount: Int {
    SequenceWithCustomUnderestimatedCount.timesUnderestimatedCountWasCalled += 1
    return _data.underestimatedCount
  }

  static var timesUnderestimatedCountWasCalled: Int = 0

  let _data: MinimalSequence<OpaqueValue<Int>>
}

${Suite}.test("${ArrayType}/init(Sequence)") {
  let base = SequenceWithCustomUnderestimatedCount(
    [ 0, 30, 10, 90 ])

  SequenceWithCustomUnderestimatedCount.timesUnderestimatedCountWasCalled = 0

  let result = ${ArrayType}(base)

  expectEqual([ 0, 30, 10, 90 ], result.map { $0.value })

  expectEqual(1, SequenceWithCustomUnderestimatedCount.timesUnderestimatedCountWasCalled)

  expectEqualSequence(
    [], Array(base).map { $0.value }, "sequence should be consumed")
}

enum EnumWithoutPayloads : Equatable {
  case A, B, C, D
}

func == (lhs: EnumWithoutPayloads, rhs: EnumWithoutPayloads) -> Bool {
  switch (lhs, rhs) {
  case (.A, .A), (.B, .B), (.C, .C), (.D, .D):
    return true

  default:
    return false
  }
}

${Suite}.test("${ArrayType}/Sliceable/Enums") {
  typealias E = EnumWithoutPayloads

  do {
    let expected = [E.A, E.B, E.C, E.D]
    let sliceable = ${ArrayType}(expected)
    checkSliceableWithBidirectionalIndex(expected, sliceable)
  }

  /*
  FIXME: add this test when Array<T> can be conditionally Equatable.
  do {
    let expected = [[E.A, E.B], [E.B, E.C], [E.D], [E.A, E.B, E.D]]
    let sliceable = ${ArrayType}(expected)
    checkSliceableWithBidirectionalIndex(
      expected, sliceable, SourceLocStack().withCurrentLoc())
  }
  */
}

${Suite}.test("${ArrayType}/appendNonUnique") {
  var x: ${ArrayType}<Int> = []
  x.reserveCapacity(10002)
  let capacity = x.capacity
  for _ in 1...10000 {
    let y = x
    x.append(1)
    expectTrue(x.capacity == capacity)
    let z = x
    x.remove(at: 0)
  }
}

${Suite}.test("${ArrayType}/appendUndercountedCollection") {
  // test that the array safely handles a
  // collection that understates its count
  var i = 0
  let l = repeatElement(42, count: 10_000).lazy
         // capture i by reference and change behavior
         // between first pass (for count) and second
         .filter { _ in i += 1; return i > 10_000 }
  var a: ${ArrayType}<Int> = []
  a.append(contentsOf: l)
}

${Suite}.test("${ArrayType}/emptyAllocation") {
  let arr0 = ${ArrayType}<Int>()
  let arr1 = ${ArrayType}<LifetimeTracked>(repeating: LifetimeTracked(0), count: 0)
  // Empty arrays all use the same buffer
  expectEqual(arr0._bufferID, arr1._bufferID)

  let arr2: ${ArrayType}<LifetimeTracked> = []
  let emptyLiteralsShareBuffer = arr0._bufferID == arr2._bufferID
  expectTrue(emptyLiteralsShareBuffer)
}

${Suite}.test("${ArrayType}/filter") {
  do {
    let arr: ${ArrayType}<Int> = []
    var result = arr.filter() {
      (x: Int) -> Bool in
      expectUnreachable()
      return true
    }
    expectType(Array<Int>.self, &result)
    expectEqual([], result)
    expectEqual(0, result.capacity)
  }
  do {
    let arr: ${ArrayType}<Int> = [ 0, 30, 10, 90 ]
    let result = arr.filter() { (x: Int) -> Bool in true }
    expectEqual([ 0, 30, 10, 90 ], result)
    expectGE(2 * result.count, result.capacity)
  }
  do {
    let arr: ${ArrayType}<Int> = [ 0, 30, 10, 90 ]
    let result = arr.filter() { (x: Int) -> Bool in false }
    expectEqual([], result)
    expectGE(2 * result.count, result.capacity)
  }
  do {
    let arr: ${ArrayType}<Int> = [ 0, 30, 10, 90 ]
    let result = arr.filter() { $0 % 3 == 0 }
    expectEqual([ 0, 30, 90 ], result)
    expectGE(2 * result.count, result.capacity)
  }
}

${Suite}.test("${ArrayType}/map") {
  do {
    let arr: ${ArrayType}<Int> = []
    var result = arr.map() {
      (x: Int) -> Int16 in
      expectUnreachable()
      return 42
    }
    expectType(Array<Int16>.self, &result)
    expectEqual([], result)
    expectEqual(0, result.capacity)
  }
  do {
    let arr: ${ArrayType}<Int> = [ 0, 30, 10, 90 ]
    let result = arr.map() { $0 + 1 }
    expectEqual([ 1, 31, 11, 91 ], result)
    expectGE(2 * result.count, result.capacity)
  }
}

${Suite}.test("${ArrayType}/flatMap") {
  let enumerate : (Int) -> ${ArrayType}<Int> =
    { return ${ArrayType}(1..<($0 + 1)) }
  expectEqualSequence([], ${ArrayType}().flatMap(enumerate))
  expectEqualSequence([ 1 ], ${ArrayType}([ 1 ]).flatMap(enumerate))
  expectEqualSequence(
    [ 1, 1, 2 ],
    ${ArrayType}([ 1, 2 ]).flatMap(enumerate))
  expectEqualSequence(
    [ 1, 1, 1, 2 ],
    ${ArrayType}([ 1, 2 ]).flatMap(enumerate).flatMap(enumerate))
}

${Suite}.test("${ArrayType}/Mirror") {
  do {
    let input: ${ArrayType}<Int> = []
    var output = ""
    dump(input, to: &output)

    let expected =
      "- 0 elements\n"

    expectEqual(expected, output)
  }
  do {
    let input: ${ArrayType}<Int> = [ 10, 20, 30, 40 ]
    var output = ""
    dump(input, to: &output)

    let expected =
      "▿ 4 elements\n" +
      "  - 10\n" +
      "  - 20\n" +
      "  - 30\n" +
      "  - 40\n"

    expectEqual(expected, output)
  }
%   if ArrayType == 'ArraySlice':
  do {
    let base = [ 10, 20, 30, 40 ]
    let input: ArraySlice<Int> = base[1..<3]
    var output = ""
    dump(input, to: &output)

    let expected =
      "▿ 2 elements\n" +
      "  - 20\n" +
      "  - 30\n"

    expectEqual(expected, output)
  }
%   end
}

//===----------------------------------------------------------------------===//
// _withUnsafeMutableBufferPointerIfSupported()
//===----------------------------------------------------------------------===//

struct WithUnsafeMutableBufferPointerIfSupportedTest {
  let sequence: [Int]
  let loc: SourceLoc

  init(
    _ sequence: [Int],
    file: String = #file, line: UInt = #line
  ) {
    self.sequence = sequence
    self.loc = SourceLoc(file, line, comment: "test data")
  }
}

let withUnsafeMutableBufferPointerIfSupportedTests = [
  WithUnsafeMutableBufferPointerIfSupportedTest([]),
  WithUnsafeMutableBufferPointerIfSupportedTest([ 10 ]),
  WithUnsafeMutableBufferPointerIfSupportedTest([ 10, 20, 30, 40, 50 ]),
]

${Suite}.test("${ArrayType}/_withUnsafeMutableBufferPointerIfSupported") {
  for test in withUnsafeMutableBufferPointerIfSupportedTests {
    var a = getFresh${ArrayType}(test.sequence.map(OpaqueValue.init))
    do {
      // Read.
      var result = a._withUnsafeMutableBufferPointerIfSupported {
        (baseAddress, count) -> OpaqueValue<[OpaqueValue<Int>]> in
        let bufferPointer =
          UnsafeMutableBufferPointer(start: baseAddress, count: count)
        return OpaqueValue(Array(bufferPointer))
      }
      expectType(Optional<OpaqueValue<Array<OpaqueValue<Int>>>>.self, &result)
      expectEqualSequence(test.sequence, result!.value.map { $0.value })
      expectEqualSequence(test.sequence, a.map { $0.value })
    }
    do {
      // Read and write.
      var result = a._withUnsafeMutableBufferPointerIfSupported {
        (baseAddress, count) -> OpaqueValue<Array<OpaqueValue<Int>>> in
        let bufferPointer =
          UnsafeMutableBufferPointer(start: baseAddress, count: count)
        let result = OpaqueValue(Array(bufferPointer))
        for i in bufferPointer.indices {
          bufferPointer[i] = OpaqueValue(bufferPointer[i].value * 10)
        }
        return result
      }
      expectType(Optional<OpaqueValue<Array<OpaqueValue<Int>>>>.self, &result)
      expectEqualSequence(test.sequence, result!.value.map { $0.value })
      expectEqualSequence(
        test.sequence.map { $0 * 10 },
        a.map { $0.value })
    }
  }
  // FIXME: tests for arrays bridged from Objective-C.
}

${Suite}.test("${ArrayType}/_withUnsafeMutableBufferPointerIfSupported/ReplacingTheBufferTraps/1") {
  var a = getFresh${ArrayType}([ OpaqueValue(10) ])
  var result = a._withUnsafeMutableBufferPointerIfSupported {
    (baseAddress, count) -> OpaqueValue<Int> in
    // buffer = UnsafeMutableBufferPointer(start: buffer.baseAddress, count: 0)
    // FIXME: does not trap since the buffer is not passed inout.
    // expectCrashLater()
    return OpaqueValue(42)
  }
}

${Suite}.test("${ArrayType}/_withUnsafeMutableBufferPointerIfSupported/ReplacingTheBufferTraps/2") {
  var a = getFresh${ArrayType}([ OpaqueValue(10) ])
  var result = a._withUnsafeMutableBufferPointerIfSupported {
    (baseAddress, count) -> OpaqueValue<Int> in
    // buffer = UnsafeMutableBufferPointer(start: nil, count: 1)
    // FIXME: does not trap since the buffer is not passed inout.
    // expectCrashLater()
    return OpaqueValue(42)
  }
}

//===----------------------------------------------------------------------===//
// withUnsafeMutableBytes
//===----------------------------------------------------------------------===//

// Test the uniqueness of the raw buffer.
${Suite}.test("${ArrayType}/withUnsafeMutableBytes") {
  var a = getFresh${ArrayType}([UInt8](repeating: 10, count: 1))
  let b = a
  a.withUnsafeMutableBytes { bytes in
    bytes[0] = 42
  }
  expectEqual(42, a[0])
  expectEqual(10, b[0])
}

//===---
// Check that iterators traverse a snapshot of the collection.
//===---

${Suite}.test(
  "${ArrayType}/mutationDoesNotAffectIterator/subscript/store") {
  var arr: ${ArrayType}<Int> = [ 1010, 1020, 1030 ]
  var iter = arr.makeIterator()
  arr[0] = 1011
  expectEqual([ 1010, 1020, 1030 ], Array(IteratorSequence(iter)))
}

${Suite}.test(
  "${ArrayType}/mutationDoesNotAffectIterator/subscript/append") {
  var arr: ${ArrayType}<Int> = [ 1010, 1020, 1030 ]
  var iter = arr.makeIterator()
  arr.append(1040)
  expectEqual([ 1010, 1020, 1030 ], Array(IteratorSequence(iter)))
}

${Suite}.test(
  "${ArrayType}/mutationDoesNotAffectIterator/subscript/replaceSubrange") {
  var arr: ${ArrayType}<Int> = [ 1010, 1020, 1030 ]
  var iter = arr.makeIterator()
  arr.replaceSubrange(1..<3, with: [ 1040, 1050, 1060 ])
  expectEqual([ 1010, 1020, 1030 ], Array(IteratorSequence(iter)))
}

//===----------------------------------------------------------------------===//
// Special cases and one-off tests.
//===----------------------------------------------------------------------===//

${Suite}.test("${ArrayType}<Void>/map") {
  // This code used to crash because it generated an array of Void with
  // stride == 0.
  do {
    let input: ${ArrayType}<Void> = [ (), (), () ]
    let result = input.map { (_) -> Void in return () }
    expectEqual(3, result.count)
  }

  do {
    let input: ${ArrayType}<OpaqueValue<Int>> = [
      OpaqueValue(10), OpaqueValue(20), OpaqueValue(30)
    ]
    let result = input.map { (_) -> Void in return () }
    expectEqual(3, result.count)
  }
}

//===----------------------------------------------------------------------===//
// MutableCollectionType and RangeReplaceableCollectionType conformance tests.
//===----------------------------------------------------------------------===//

${Suite}.test("${ArrayType}/AssociatedTypes") {
  typealias Collection = ${ArrayType}<OpaqueValue<Int>>
  typealias CollectionSlice = ArraySlice<OpaqueValue<Int>>
  expectCollectionAssociatedTypes(
    collectionType: Collection.self,
    iteratorType: IndexingIterator<Collection>.self,
    subSequenceType: CollectionSlice.self,
    indexType: Int.self,
    indexDistanceType: Int.self,
    indicesType: CountableRange<Int>.self)
}