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# to you under the Apache License, Version 2.0 (the
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#
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import numpy as np
import pytest
import tvm_ffi

import tvm
import tvm.testing
from tvm.script import ir as I
from tvm.script import tirx as T
from tvm.testing import env


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_metal_inf_nan():
    target = "metal"

    def check_inf_nan(n, value, dtype):
        @I.ir_module(s_tir=True)
        class Module:
            @T.prim_func(s_tir=True)
            def main(
                A: T.Buffer((1,), dtype),
                C: T.Buffer((1,), dtype),
            ):
                T.func_attr({"tirx.noalias": True})
                for i in T.thread_binding(1, thread="threadIdx.x"):
                    with T.sblock("C"):
                        v_i = T.axis.spatial(1, i)
                        T.reads()
                        T.writes(C[v_i])
                        C[v_i] = T.Cast(dtype, value)

        fun = tvm.compile(Module, target=target)

        def run_and_check():
            dev = tvm.device(target, 0)
            a = tvm.runtime.empty((n,), dtype, dev)
            c = tvm.runtime.empty((n,), dtype, dev)
            fun(a, c)

        tvm.testing.run_with_gpu_lock(run_and_check)

    check_inf_nan(1, -float("inf"), "float32")
    check_inf_nan(1, -float("inf"), "float16")
    check_inf_nan(1, float("inf"), "float32")
    check_inf_nan(1, float("inf"), "float16")
    check_inf_nan(1, float("nan"), "float32")
    check_inf_nan(1, float("nan"), "float16")


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_unaligned_vectorize():
    @tvm.script.ir_module
    class IRModule:
        @T.prim_func(s_tir=True)
        def main(A: T.Buffer((2, 3), "float32"), B: T.Buffer((6,), "float32")):
            T.func_attr({"global_symbol": "main"})
            for i0_1 in T.thread_binding(3, thread="threadIdx.x"):
                for i0_0 in T.vectorized(2):
                    with T.sblock("block"):
                        vi0 = T.axis.spatial(6, i0_0 * 3 + i0_1)
                        B[vi0] = A[vi0 // 3, vi0 % 3]

    target = "metal"
    a = (np.arange(6).reshape(2, 3)).astype("float32")
    f = tvm.compile(IRModule, target=target)

    def run_and_check():
        dev = tvm.metal()
        a_nd = tvm.runtime.tensor(a, dev)
        b_nd = tvm.runtime.empty((6,), "float32", dev)
        f(a_nd, b_nd)
        tvm.testing.assert_allclose(b_nd.numpy(), a.reshape(6), atol=1e-5, rtol=1e-5)

    tvm.testing.run_with_gpu_lock(run_and_check)


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_metal_erf():
    target = "metal"

    def check_erf(n, dtype):
        @I.ir_module(s_tir=True)
        class Module:
            @T.prim_func(s_tir=True)
            def main(
                A: T.Buffer((1,), dtype),
                C: T.Buffer((1,), dtype),
            ):
                T.func_attr({"tirx.noalias": True})
                for i0 in T.thread_binding(1, thread="threadIdx.x"):
                    with T.sblock("C"):
                        v_i0 = T.axis.spatial(1, i0)
                        T.reads(A[v_i0])
                        T.writes(C[v_i0])
                        C[v_i0] = T.erf(A[v_i0])

        fun = tvm.compile(Module, target=target)

        def run_and_check():
            dev = tvm.device(target, 0)
            a = tvm.runtime.empty((n,), dtype, dev)
            c = tvm.runtime.empty((n,), dtype, dev)
            fun(a, c)

        tvm.testing.run_with_gpu_lock(run_and_check)

    check_erf(1, "float32")
    check_erf(1, "float16")


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_ramp():
    target = "metal"

    @tvm.script.ir_module
    class IRModule:
        @T.prim_func(s_tir=True)
        def main(A: T.Buffer((1, 2), "int32")):
            T.func_attr({"global_symbol": "main"})
            for i in T.thread_binding(1, thread="threadIdx.x"):
                with T.sblock("block"):
                    tx = T.axis.spatial(1, i)
                    r = T.ramp(tx, 3, 2)
                    A[0, T.ramp(0, 1, 2)] = r

    f = tvm.compile(IRModule, target=target)

    def run_and_check():
        dev = tvm.metal()
        a_nd = tvm.runtime.empty((1, 2), "int32", dev)
        f(a_nd)
        assert tuple(a_nd.numpy()[0, :]) == (0, 3)

    tvm.testing.run_with_gpu_lock(run_and_check)


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_select_vectorize():
    @tvm.script.ir_module
    class IRModule:
        @T.prim_func(s_tir=True)
        def main(A: T.Buffer((6), "float32"), B: T.Buffer((6,), "float32")):
            T.func_attr({"global_symbol": "main"})
            for i0_1 in T.thread_binding(3, thread="threadIdx.x"):
                for i0_0 in T.vectorized(2):
                    with T.sblock("block"):
                        vi0 = T.axis.spatial(6, i0_0 * 3 + i0_1)
                        B[vi0] = T.Select((vi0 % 2) == 0, A[vi0], T.float32(0))

    target = "metal"
    a = np.arange(6).astype("float32")
    f = tvm.compile(IRModule, target=target)
    a.reshape(3, 2)[:, 1] = 0

    def run_and_check():
        dev = tvm.metal()
        a_nd = tvm.runtime.tensor(a, dev)
        b_nd = tvm.runtime.empty((6,), "float32", dev)
        f(a_nd, b_nd)
        tvm.testing.assert_allclose(b_nd.numpy(), a, atol=1e-5, rtol=1e-5)

    tvm.testing.run_with_gpu_lock(run_and_check)


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_vectorized_uint8():
    @T.prim_func(s_tir=True)
    def func(A: T.Buffer((16), "uint8"), B: T.Buffer((16), "float32")):
        for i in T.thread_binding(4, thread="threadIdx.x"):
            for j in T.vectorized(4):
                with T.sblock("block"):
                    vi = T.axis.spatial(16, i * 4 + j)
                    B[vi] = T.Cast("float32", A[vi])

    a = np.arange(16).astype("uint8")
    f = tvm.compile(func, target="metal")

    def run_and_check():
        dev = tvm.metal()
        a_nd = tvm.runtime.tensor(a, dev)
        b_nd = tvm.runtime.empty((16,), "float32", dev)
        f(a_nd, b_nd)
        tvm.testing.assert_allclose(b_nd.numpy(), a.astype("float32"), atol=1e-5, rtol=1e-5)

    tvm.testing.run_with_gpu_lock(run_and_check)


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_func_with_trailing_pod_params():
    from tvm.support import xcode  # pylint: disable=import-outside-toplevel

    @T.prim_func(s_tir=True)
    def func(A: T.Buffer((16), "float32"), B: T.Buffer((16), "float32"), x: T.float32):
        for i in T.thread_binding(16, thread="threadIdx.x"):
            with T.sblock("block"):
                vi = T.axis.spatial(16, i)
                B[vi] = A[vi] + x

    @tvm.register_global_func("tvm_callback_metal_compile")
    def compile_metal(src, target):
        return xcode.compile_metal(src)

    mod = tvm.IRModule({"main": func})

    f = tvm.tirx.build(mod, target="metal")
    src: str = f.imports[0].inspect_source()
    occurrences = src.count("struct func_kernel_args_t")
    assert occurrences == 1, occurrences


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_metal_compile_callback_source_passthrough():
    n = 1024

    @I.ir_module(s_tir=True)
    class Module:
        @T.prim_func(s_tir=True)
        def main(A: T.Buffer((n,), "float32"), B: T.Buffer((n,), "float32")):
            T.func_attr({"tirx.noalias": True})
            for i_0 in T.thread_binding(n // 32, thread="blockIdx.x"):
                for i_1 in T.thread_binding(32, thread="threadIdx.x"):
                    with T.sblock("B"):
                        v_i = T.axis.spatial(n, i_0 * 32 + i_1)
                        T.reads(A[v_i])
                        T.writes(B[v_i])
                        B[v_i] = A[v_i] + 1.0

    seen = {}

    def inspect_callback(src, target):
        # Pure inspection callback: capture the source, return it untouched and
        # declare it is still textual MSL so it is compiled at load time.
        seen["src"] = src
        return (src, "metal")

    tvm.register_global_func("tvm_callback_metal_compile", inspect_callback, override=True)
    try:
        f = tvm.compile(Module, target="metal")
        dev = tvm.metal()
        a = np.random.rand(n).astype("float32")
        a_nd = tvm.runtime.tensor(a, dev)
        b_nd = tvm.runtime.empty((n,), "float32", dev)
        f(a_nd, b_nd)
        dev.sync()
    finally:
        tvm_ffi.registry.remove_global_func("tvm_callback_metal_compile")

    assert "src" in seen and len(seen["src"]) > 0
    tvm.testing.assert_allclose(b_nd.numpy(), a + 1.0, atol=1e-5, rtol=1e-5)


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_metal_compile_callback_mixed_formats_rejected():
    n = 1024

    @I.ir_module(s_tir=True)
    class Module:
        @T.prim_func(s_tir=True)
        def main(
            A: T.Buffer((n,), "float32"),
            B: T.Buffer((n,), "float32"),
            C: T.Buffer((n,), "float32"),
        ):
            T.func_attr({"tirx.noalias": True})
            # Two independent thread-bound regions -> two device kernels, so the
            # compile callback is invoked twice within one module.
            for i_0 in T.thread_binding(n // 32, thread="blockIdx.x"):
                for i_1 in T.thread_binding(32, thread="threadIdx.x"):
                    with T.sblock("B"):
                        v_i = T.axis.spatial(n, i_0 * 32 + i_1)
                        T.reads(A[v_i])
                        T.writes(B[v_i])
                        B[v_i] = A[v_i] + 1.0
            for j_0 in T.thread_binding(n // 32, thread="blockIdx.x"):
                for j_1 in T.thread_binding(32, thread="threadIdx.x"):
                    with T.sblock("C"):
                        v_j = T.axis.spatial(n, j_0 * 32 + j_1)
                        T.reads(A[v_j])
                        T.writes(C[v_j])
                        C[v_j] = A[v_j] + 2.0

    calls = {"n": 0}

    def mixed_callback(src, target):
        calls["n"] += 1
        if calls["n"] == 1:
            # Treated as a compiled metallib payload.
            return src
        # Second kernel declares textual MSL, contradicting the metallib above.
        return (src, "metal")

    tvm.register_global_func("tvm_callback_metal_compile", mixed_callback, override=True)
    try:
        with pytest.raises(Exception, match="inconsistent formats"):
            tvm.compile(Module, target="metal")
    finally:
        tvm_ffi.registry.remove_global_func("tvm_callback_metal_compile")


@pytest.mark.gpu
@pytest.mark.skipif(not env.has_metal(), reason="need metal")
def test_export_load_with_fallback(monkeypatch, tmp_path):
    """Force the codegen wrapper into the fallback branch, then export."""
    n = 1024

    @I.ir_module(s_tir=True)
    class Module:
        @T.prim_func(s_tir=True)
        def main(A: T.Buffer((n,), "float32"), B: T.Buffer((n,), "float32")):
            T.func_attr({"tirx.noalias": True})
            for i_0 in T.thread_binding(n // 32, thread="blockIdx.x"):
                for i_1 in T.thread_binding(32, thread="threadIdx.x"):
                    with T.sblock("B"):
                        v_i = T.axis.spatial(n, i_0 * 32 + i_1)
                        T.reads(A[v_i])
                        T.writes(B[v_i])
                        B[v_i] = A[v_i] + 1.0

    monkeypatch.setenv("TVM_COMPILE_FORCE_FALLBACK", "1")
    host_lib = tvm.compile(Module, target="metal")
    monkeypatch.delenv("TVM_COMPILE_FORCE_FALLBACK")

    lib_path = str(tmp_path / "lib.so")
    host_lib.export_library(lib_path)


if __name__ == "__main__":
    tvm.testing.main()
