// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

use super::{assert_block_instructions, assert_blocks, assert_callable, get_rir_program};
use expect_test::expect;
use indoc::indoc;
use qsc_rir::rir::{BlockId, CallableId};

#[test]
fn unitary_call_within_a_for_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            operation op(q : Qubit) : Unit { body intrinsic; }
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                for _ in 1..3 {
                    op(q);
                }
            }
        }
        "#,
    });

    let op_callable_id = CallableId(1);
    assert_callable(
        &program,
        op_callable_id,
        &expect![[r#"
            Callable:
                name: __quantum__rt__initialize
                call_type: Regular
                input_type:
                    [0]: Pointer
                output_type: <VOID>
                body: <NONE>"#]],
    );
    assert_block_instructions(
        &program,
        BlockId(0),
        &expect![[r#"
            Block:
                Call id(1), args( Pointer, )
                Variable(0, Integer) = Store Integer(1)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(2)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(3)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(4)
                Call id(3), args( Integer(0), EmptyTag, )
                Return"#]],
    );
}

#[test]
fn unitary_call_within_a_while_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            operation op(q : Qubit) : Unit { body intrinsic; }
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                mutable idx = 0;
                while idx < 3 {
                    op(q);
                    set idx += 1;
                }
            }
        }
        "#,
    });

    let rotation_callable_id = CallableId(1);
    assert_callable(
        &program,
        rotation_callable_id,
        &expect![[r#"
            Callable:
                name: __quantum__rt__initialize
                call_type: Regular
                input_type:
                    [0]: Pointer
                output_type: <VOID>
                body: <NONE>"#]],
    );
    assert_block_instructions(
        &program,
        BlockId(0),
        &expect![[r#"
            Block:
                Call id(1), args( Pointer, )
                Variable(0, Integer) = Store Integer(0)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(1)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(2)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(3)
                Call id(3), args( Integer(0), EmptyTag, )
                Return"#]],
    );
}

#[test]
fn unitary_call_within_a_repeat_until_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            operation op(q : Qubit) : Unit { body intrinsic; }
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                mutable idx = 0;
                repeat {
                    op(q);
                    set idx += 1;
                } until idx >= 3;
            }
        }
        "#,
    });

    let op_callable_id = CallableId(1);
    assert_callable(
        &program,
        op_callable_id,
        &expect![[r#"
            Callable:
                name: __quantum__rt__initialize
                call_type: Regular
                input_type:
                    [0]: Pointer
                output_type: <VOID>
                body: <NONE>"#]],
    );
    assert_block_instructions(
        &program,
        BlockId(0),
        &expect![[r#"
            Block:
                Call id(1), args( Pointer, )
                Variable(0, Integer) = Store Integer(0)
                Variable(1, Boolean) = Store Bool(true)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(1)
                Variable(1, Boolean) = Store Bool(true)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(2)
                Variable(1, Boolean) = Store Bool(true)
                Call id(2), args( Qubit(0), )
                Variable(0, Integer) = Store Integer(3)
                Variable(1, Boolean) = Store Bool(false)
                Call id(3), args( Integer(0), EmptyTag, )
                Return"#]],
    );
}

#[test]
fn rotation_call_within_a_for_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            operation rotation(theta : Double, q : Qubit) : Unit { body intrinsic; }
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                for theta in [0.0, 1.0, 2.0] {
                    rotation(theta, q);
                }
            }
        }
        "#,
    });

    let rotation_callable_id = CallableId(1);
    assert_callable(
        &program,
        rotation_callable_id,
        &expect![[r#"
            Callable:
                name: __quantum__rt__initialize
                call_type: Regular
                input_type:
                    [0]: Pointer
                output_type: <VOID>
                body: <NONE>"#]],
    );
    assert_block_instructions(
        &program,
        BlockId(0),
        &expect![[r#"
            Block:
                Call id(1), args( Pointer, )
                Variable(0, Integer) = Store Integer(0)
                Call id(2), args( Double(0), Qubit(0), )
                Variable(0, Integer) = Store Integer(1)
                Call id(2), args( Double(1), Qubit(0), )
                Variable(0, Integer) = Store Integer(2)
                Call id(2), args( Double(2), Qubit(0), )
                Variable(0, Integer) = Store Integer(3)
                Call id(3), args( Integer(0), EmptyTag, )
                Return"#]],
    );
}

#[test]
fn rotation_call_within_a_while_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            operation rotation(theta : Double, q : Qubit) : Unit { body intrinsic; }
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                let angles = [0.0, 1.0, 2.0];
                mutable idx = 0;
                while idx < 3 {
                    rotation(angles[idx], q);
                    set idx += 1;
                }
            }
        }
        "#,
    });

    let op_callable_id = CallableId(1);
    assert_callable(
        &program,
        op_callable_id,
        &expect![[r#"
            Callable:
                name: __quantum__rt__initialize
                call_type: Regular
                input_type:
                    [0]: Pointer
                output_type: <VOID>
                body: <NONE>"#]],
    );
    assert_block_instructions(
        &program,
        BlockId(0),
        &expect![[r#"
            Block:
                Call id(1), args( Pointer, )
                Variable(0, Integer) = Store Integer(0)
                Call id(2), args( Double(0), Qubit(0), )
                Variable(0, Integer) = Store Integer(1)
                Call id(2), args( Double(1), Qubit(0), )
                Variable(0, Integer) = Store Integer(2)
                Call id(2), args( Double(2), Qubit(0), )
                Variable(0, Integer) = Store Integer(3)
                Call id(3), args( Integer(0), EmptyTag, )
                Return"#]],
    );
}

#[test]
fn rotation_call_within_a_repeat_until_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            operation rotation(theta : Double, q : Qubit) : Unit { body intrinsic; }
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                let angles = [0.0, 1.0, 2.0];
                mutable idx = 0;
                repeat {
                    rotation(angles[idx], q);
                    set idx += 1;
                } until idx >= 3;
            }
        }
        "#,
    });

    let rotation_callable_id = CallableId(1);
    assert_callable(
        &program,
        rotation_callable_id,
        &expect![[r#"
            Callable:
                name: __quantum__rt__initialize
                call_type: Regular
                input_type:
                    [0]: Pointer
                output_type: <VOID>
                body: <NONE>"#]],
    );
    assert_block_instructions(
        &program,
        BlockId(0),
        &expect![[r#"
            Block:
                Call id(1), args( Pointer, )
                Variable(0, Integer) = Store Integer(0)
                Variable(1, Boolean) = Store Bool(true)
                Call id(2), args( Double(0), Qubit(0), )
                Variable(0, Integer) = Store Integer(1)
                Variable(1, Boolean) = Store Bool(true)
                Call id(2), args( Double(1), Qubit(0), )
                Variable(0, Integer) = Store Integer(2)
                Variable(1, Boolean) = Store Bool(true)
                Call id(2), args( Double(2), Qubit(0), )
                Variable(0, Integer) = Store Integer(3)
                Variable(1, Boolean) = Store Bool(false)
                Call id(3), args( Integer(0), EmptyTag, )
                Return"#]],
    );
}

#[test]
fn mutable_bool_updated_in_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                mutable flag = false;
                for _ in 1..3 {
                    if not flag {
                        set flag = MResetZ(q) == One;
                    }
                }
            }
        }
        "#,
    });

    assert_block_instructions(
        &program,
        BlockId(0),
        &expect![[r#"
            Block:
                Call id(1), args( Pointer, )
                Variable(0, Boolean) = Store Bool(false)
                Variable(1, Integer) = Store Integer(1)
                Call id(2), args( Qubit(0), Result(0), )
                Variable(2, Boolean) = Call id(3), args( Result(0), )
                Variable(3, Boolean) = Store Variable(2, Boolean)
                Variable(0, Boolean) = Store Variable(3, Boolean)
                Variable(1, Integer) = Store Integer(2)
                Variable(4, Boolean) = LogicalNot Variable(0, Boolean)
                Branch Variable(4, Boolean), 2, 1"#]],
    );
}

#[test]
fn mutable_int_updated_in_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                mutable count = 1;
                for _ in 1..3 {
                    if count > 0 and MResetZ(q) == One {
                        set count = -count;
                    }
                }
            }
        }
        "#,
    });

    assert_block_instructions(
        &program,
        BlockId(0),
        &expect![[r#"
            Block:
                Call id(1), args( Pointer, )
                Variable(0, Integer) = Store Integer(1)
                Variable(1, Integer) = Store Integer(1)
                Call id(2), args( Qubit(0), Result(0), )
                Variable(2, Boolean) = Call id(3), args( Result(0), )
                Variable(3, Boolean) = Store Variable(2, Boolean)
                Branch Variable(3, Boolean), 2, 1"#]],
    );
}

#[test]
fn mutable_double_updated_in_loop() {
    let program = get_rir_program(indoc! {
        r#"
        namespace Test {
            @EntryPoint()
            operation Main() : Unit {
                use q = Qubit();
                mutable count = 1.1;
                for _ in 1..3 {
                    if count > 0.1 and MResetZ(q) == One {
                        set count = -count;
                    }
                }
            }
        }
        "#,
    });

    assert_blocks(
        &program,
        &expect![[r#"
            Blocks:
            Block 0:Block:
                Call id(1), args( Pointer, )
                Variable(0, Double) = Store Double(1.1)
                Variable(1, Integer) = Store Integer(1)
                Call id(2), args( Qubit(0), Result(0), )
                Variable(2, Boolean) = Call id(3), args( Result(0), )
                Variable(3, Boolean) = Store Variable(2, Boolean)
                Branch Variable(3, Boolean), 2, 1
            Block 1:Block:
                Variable(1, Integer) = Store Integer(2)
                Variable(4, Boolean) = Fcmp Ogt, Variable(0, Double), Double(0.1)
                Variable(5, Boolean) = Store Bool(false)
                Branch Variable(4, Boolean), 4, 3
            Block 2:Block:
                Variable(0, Double) = Store Double(-1.1)
                Jump(1)
            Block 3:Block:
                Branch Variable(5, Boolean), 6, 5
            Block 4:Block:
                Call id(2), args( Qubit(0), Result(1), )
                Variable(6, Boolean) = Call id(3), args( Result(1), )
                Variable(7, Boolean) = Store Variable(6, Boolean)
                Variable(5, Boolean) = Store Variable(7, Boolean)
                Jump(3)
            Block 5:Block:
                Variable(1, Integer) = Store Integer(3)
                Variable(9, Boolean) = Fcmp Ogt, Variable(0, Double), Double(0.1)
                Variable(10, Boolean) = Store Bool(false)
                Branch Variable(9, Boolean), 8, 7
            Block 6:Block:
                Variable(8, Double) = Fmul Double(-1), Variable(0, Double)
                Variable(0, Double) = Store Variable(8, Double)
                Jump(5)
            Block 7:Block:
                Branch Variable(10, Boolean), 10, 9
            Block 8:Block:
                Call id(2), args( Qubit(0), Result(2), )
                Variable(11, Boolean) = Call id(3), args( Result(2), )
                Variable(12, Boolean) = Store Variable(11, Boolean)
                Variable(10, Boolean) = Store Variable(12, Boolean)
                Jump(7)
            Block 9:Block:
                Variable(1, Integer) = Store Integer(4)
                Call id(4), args( Integer(0), EmptyTag, )
                Return
            Block 10:Block:
                Variable(13, Double) = Fmul Double(-1), Variable(0, Double)
                Variable(0, Double) = Store Variable(13, Double)
                Jump(9)"#]],
    );
}

#[test]
fn result_array_index_range_in_for_loop() {
    let program = get_rir_program(indoc! {r#"
        namespace Test {
            @EntryPoint()
            operation Main() : Int {
                use qs = Qubit[2];
                let results = MResetEachZ(qs);
                mutable count = 0;
                for i in Std.Arrays.IndexRange(results) {
                    if results[i] == One {
                        set count += 1;
                    }
                }
                count
            }
        }
    "#});
    expect![[r#"
        Program:
            entry: 0
            callables:
                Callable 0: Callable:
                    name: main
                    call_type: Regular
                    input_type: <VOID>
                    output_type: Integer
                    body: 0
                Callable 1: Callable:
                    name: __quantum__rt__initialize
                    call_type: Regular
                    input_type:
                        [0]: Pointer
                    output_type: <VOID>
                    body: <NONE>
                Callable 2: Callable:
                    name: __quantum__qis__mresetz__body
                    call_type: Measurement
                    input_type:
                        [0]: Qubit
                        [1]: Result
                    output_type: <VOID>
                    body: <NONE>
                Callable 3: Callable:
                    name: __quantum__rt__read_result
                    call_type: Readout
                    input_type:
                        [0]: Result
                    output_type: Boolean
                    body: <NONE>
                Callable 4: Callable:
                    name: __quantum__rt__int_record_output
                    call_type: OutputRecording
                    input_type:
                        [0]: Integer
                        [1]: Pointer
                    output_type: <VOID>
                    body: <NONE>
            blocks:
                Block 0: Block:
                    Call id(1), args( Pointer, )
                    Variable(0, Integer) = Store Integer(0)
                    Variable(0, Integer) = Store Integer(1)
                    Variable(0, Integer) = Store Integer(2)
                    Variable(1, Integer) = Store Integer(0)
                    Call id(2), args( Qubit(0), Result(0), )
                    Variable(1, Integer) = Store Integer(1)
                    Call id(2), args( Qubit(1), Result(1), )
                    Variable(1, Integer) = Store Integer(2)
                    Variable(2, Integer) = Store Integer(0)
                    Variable(3, Integer) = Store Integer(0)
                    Variable(4, Boolean) = Call id(3), args( Result(0), )
                    Variable(5, Boolean) = Store Variable(4, Boolean)
                    Branch Variable(5, Boolean), 2, 1
                Block 1: Block:
                    Variable(3, Integer) = Store Integer(1)
                    Variable(6, Boolean) = Call id(3), args( Result(1), )
                    Variable(7, Boolean) = Store Variable(6, Boolean)
                    Branch Variable(7, Boolean), 4, 3
                Block 2: Block:
                    Variable(2, Integer) = Store Integer(1)
                    Jump(1)
                Block 3: Block:
                    Variable(3, Integer) = Store Integer(2)
                    Variable(9, Integer) = Store Variable(2, Integer)
                    Variable(10, Integer) = Store Integer(0)
                    Variable(10, Integer) = Store Integer(1)
                    Variable(10, Integer) = Store Integer(2)
                    Call id(4), args( Variable(9, Integer), Tag(0, 3), )
                    Return
                Block 4: Block:
                    Variable(8, Integer) = Add Variable(2, Integer), Integer(1)
                    Variable(2, Integer) = Store Variable(8, Integer)
                    Jump(3)
            config: Config:
                capabilities: TargetCapabilityFlags(Adaptive | IntegerComputations | FloatingPointComputations | BackwardsBranching | HigherLevelConstructs)
            num_qubits: 2
            num_results: 2
            tags:
                [0]: 0_i
    "#]].assert_eq(&program.to_string());
}
