/* -----------------------------------------------------------------------------
Copyright 2020 Kevin P. Barry

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.
----------------------------------------------------------------------------- */

// Author: Kevin P. Barry [ta0kira@gmail.com]

testcase "optional persists" {
  success Test$run()
}

define Test {
  @value optional Test self2

  @type create () -> (Test)
  create () {
    return Test{ empty }
  }

  @value set () -> ()
  set () {
    scoped {
      Test value <- create()
    } in self2 <- value
  }

  @value check () -> ()
  check () {
    \ require(self2)
  }

  run () {
    Test value <- create()
    \ value.set()
    \ value.check()
  }
}

concrete Test {
  @type run () -> ()
}


testcase "weak is weak" {
  success Test$run()
}

define Test {
  @value weak Test self2

  @type create () -> (Test)
  create () {
    return Test{ empty }
  }

  @value set () -> ()
  set () {
    scoped {
      Test value <- create()
    } in self2 <- value
  }

  @value check () -> ()
  check () {
    scoped {
      optional Test self3 <- strong(self2)
    } in if (present(self3)) {
      fail("Failed")
    }
  }

  run () {
    Test value <- create()
    \ value.set()
    \ value.check()
  }
}

concrete Test {
  @type run () -> ()
}


testcase "present weak" {
  success Test$run()
}

define Test {
  @type create () -> (Test)
  create () {
    return Test{}
  }

  @value check () -> ()
  check () {
    weak Test value <- create()
    if (present(strong(value))) {  // value should be nullptr here
      fail("Failed")
    }
  }

  run () {
    Test value <- create()
    \ value.check()
  }
}

concrete Test {
  @type run () -> ()
}


testcase "weak variable to weak variable" {
  success Test$run()
}

define Test {
  @category weak Test one <- empty

  run () {
    weak Test two <- one
    one <- two
  }
}

concrete Test {
  @type run () -> ()
}


testcase "optional variable to weak variable" {
  success Test$run()
}

define Test {
  @category optional Test one <- empty

  run () {
    weak Test two <- one
    two <- one
  }
}

concrete Test {
  @type run () -> ()
}


testcase "weak in multi assign" {
  success Test$run()
}

concrete Value {
  @type create () -> (Value)
}

define Value {
  create () {
    return Value{}
  }
}

define Test {
  @type get () -> (Value,Value)
  get () {
    Value value <- Value$create()
    return value, value
  }

  run () {
    // value1 ensures value2 is present.
    Value value1, weak Value value2 <- get()
    if (!present(strong(value2))) {
      fail("Failed")
    }
  }
}

concrete Test {
  @type run () -> ()
}


testcase "weak in inline assign" {
  success Test$run()
}

concrete Value {
  @type create () -> (Value)
}

define Value {
  create () {
    return Value{}
  }
}

define Test {
  run () {
    Value value1 <- Value$create()
    weak Value value2 <- empty
    if (!present(strong((value2 <- value1)))) {
      fail("Failed")
    }
  }
}

concrete Test {
  @type run () -> ()
}


testcase "present required" {
  success Test$run()
}

define Test {
  @type create () -> (Test)
  create () {
    return Test{}
  }

  run () {
    Test value <- create()
    if (!present(value)) {
      fail("Failed")
    }
  }
}

concrete Test {
  @type run () -> ()
}


testcase "require required" {
  success Test$run()
}

define Test {
  @type create () -> (Test)
  create () {
    return Test{}
  }

  @value call () -> ()
  call () {}

  run () {
    Test value <- create()
    \ require(value).call()
  }
}

concrete Test {
  @type run () -> ()
}