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# pylint: disable=missing-function-docstring,missing-module-docstring
import pytest
import tvm
from tvm import tir
from tvm.script import tir as T
from tvm.tir.schedule.testing import verify_trace_roundtrip

# fmt: off
# pylint: disable=no-member,invalid-name,unused-variable,unexpected-keyword-arg

@T.prim_func
def element_wise(A: T.Buffer[(128, 128), "float32"], C: T.Buffer[(128, 128), "float32"]) -> None:
    B = T.alloc_buffer((128, 128), dtype="float32")

    for i, j in T.grid(128, 128):
        with T.block("B"):
            vi, vj = T.axis.remap("SS", [i, j])
            B[vi, vj] = A[vi, vj] * 2.0
    for i, j in T.grid(128, 128):
        with T.block("C"):
            vi, vj = T.axis.remap("SS", [i, j])
            C[vi, vj] = B[vi, vj] + 1.0


@T.prim_func
def element_wise_set_scope(A: T.Buffer[(128, 128), "float32"], C: T.Buffer[(128, 128), "float32"]) -> None:
    B_shared = T.alloc_buffer([128, 128], dtype="float32", scope="shared")

    for i, j in T.grid(128, 128):
        with T.block("B"):
            vi, vj = T.axis.remap("SS", [i, j])
            B_shared[vi, vj] = A[vi, vj] * T.float32(2)
    for i, j in T.grid(128, 128):
        with T.block("C"):
            vi, vj = T.axis.remap("SS", [i, j])
            C[vi, vj] = B_shared[vi, vj] + T.float32(1)


@T.prim_func
def element_wise_subregion_match(A: T.Buffer[(128, 128), "float32"], C: T.Buffer[(128, 128), "float32"]) -> None:
    B = T.alloc_buffer((128, 128), dtype="float32")

    for i, j in T.grid(128, 128):
        with T.block("B"):
            vi, vj = T.axis.remap("SS", [i, j])
            B_subregion0 = T.match_buffer(B[i, j], [], offset_factor=1)
            B_subregion0[()] = A[vi, vj] * 2.0
    for i, j in T.grid(128, 128):
        with T.block("C"):
            vi, vj = T.axis.remap("SS", [i, j])
            B_subregion1 = T.match_buffer(B[i, j], [], offset_factor=1)
            C[vi, vj] = B_subregion1[()] + 1.0


@T.prim_func
def element_wise_subregion_match_set_scope(A: T.Buffer[(128, 128), "float32"], C: T.Buffer[(128, 128), "float32"]) -> None:
    B_shared = T.alloc_buffer([128, 128], dtype="float32", scope="shared")

    for i, j in T.grid(128, 128):
        with T.block("B"):
            vi, vj = T.axis.remap("SS", [i, j])
            B_subregion0_shared = T.match_buffer(B_shared[i, j], [], dtype="float32", scope="shared", offset_factor=1)
            B_subregion0_shared[()] = A[vi, vj] * T.float32(2)
    for i, j in T.grid(128, 128):
        with T.block("C"):
            vi, vj = T.axis.remap("SS", [i, j])
            B_subregion1_shared = T.match_buffer(B_shared[i, j], [], dtype="float32", scope="shared", offset_factor=1)
            C[vi, vj] = B_subregion1_shared[()] + T.float32(1)


# pylint: enable=no-member,invalid-name,unused-variable,unexpected-keyword-arg


def test_set_scope():
    func = element_wise
    s = tir.Schedule(func, debug_mask='all')
    s.set_scope(s.get_block("B"), 0, "shared")
    tvm.ir.assert_structural_equal(element_wise_set_scope, s.mod["main"])
    verify_trace_roundtrip(sch=s, mod=func)


def test_set_scope_fail_on_output_buffer():
    func = element_wise
    s = tir.Schedule(func, debug_mask='all')
    with pytest.raises(tvm.tir.ScheduleError):
        s.set_scope(s.get_block("C"), 0, "shared")


def test_set_scope_fail_on_index_out_of_bound():
    func = element_wise
    s = tir.Schedule(func, debug_mask='all')
    with pytest.raises(tvm.tir.ScheduleError):
        s.set_scope(s.get_block("B"), 1, "shared")
    with pytest.raises(tvm.tir.ScheduleError):
        s.set_scope(s.get_block("B"), -1, "shared")


def test_set_scope_fail_on_invalid_scope():
    func = element_wise
    s = tir.Schedule(func, debug_mask='all')
    with pytest.raises(tvm.tir.ScheduleError):
        s.set_scope(s.get_block("B"), 0, "test_scope")


def test_set_scope_subregion():
    func = element_wise_subregion_match
    s = tir.Schedule(func, debug_mask='all')
    s.set_scope(s.get_block("B"), 0, "shared")
    tvm.ir.assert_structural_equal(element_wise_subregion_match_set_scope, s.mod["main"])
    verify_trace_roundtrip(sch=s, mod=func)


if __name__ == "__main__":
    test_set_scope()
    test_set_scope_fail_on_output_buffer()
    test_set_scope_fail_on_index_out_of_bound()
    test_set_scope_fail_on_invalid_scope()
    test_set_scope_subregion()