// Copyright 2017 The Dawn Authors
//
// 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.

#include <gmock/gmock.h>

#include "dawn_native/CommandEncoder.h"

#include "tests/unittests/validation/ValidationTest.h"

#include "utils/WGPUHelpers.h"

using ::testing::HasSubstr;

class CommandBufferValidationTest : public ValidationTest {};

// Test for an empty command buffer
TEST_F(CommandBufferValidationTest, Empty) {
    device.CreateCommandEncoder().Finish();
}

// Test that a command buffer cannot be ended mid render pass
TEST_F(CommandBufferValidationTest, EndedMidRenderPass) {
    DummyRenderPass dummyRenderPass(device);

    // Control case, command buffer ended after the pass is ended.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        encoder.Finish();
    }

    // Error case, command buffer ended mid-pass.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Command buffer recording ended before [RenderPassEncoder] was ended."));
    }

    // Error case, command buffer ended mid-pass. Trying to use encoders after Finish
    // should fail too.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Command buffer recording ended before [RenderPassEncoder] was ended."));
        ASSERT_DEVICE_ERROR(
            pass.EndPass(),
            HasSubstr("Recording in an error or already ended [RenderPassEncoder]."));
    }
}

// Test that a command buffer cannot be ended mid compute pass
TEST_F(CommandBufferValidationTest, EndedMidComputePass) {
    // Control case, command buffer ended after the pass is ended.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
        pass.EndPass();
        encoder.Finish();
    }

    // Error case, command buffer ended mid-pass.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Command buffer recording ended before [ComputePassEncoder] was ended."));
    }

    // Error case, command buffer ended mid-pass. Trying to use encoders after Finish
    // should fail too.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Command buffer recording ended before [ComputePassEncoder] was ended."));
        ASSERT_DEVICE_ERROR(
            pass.EndPass(),
            HasSubstr("Recording in an error or already ended [ComputePassEncoder]."));
    }
}

// Test that a render pass cannot be ended twice
TEST_F(CommandBufferValidationTest, RenderPassEndedTwice) {
    DummyRenderPass dummyRenderPass(device);

    // Control case, pass is ended once
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        encoder.Finish();
    }

    // Error case, pass ended twice
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        pass.EndPass();
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Recording in an error or already ended [RenderPassEncoder]."));
    }
}

// Test that a compute pass cannot be ended twice
TEST_F(CommandBufferValidationTest, ComputePassEndedTwice) {
    // Control case, pass is ended once.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
        pass.EndPass();
        encoder.Finish();
    }

    // Error case, pass ended twice
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
        pass.EndPass();
        pass.EndPass();
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Recording in an error or already ended [ComputePassEncoder]."));
    }
}

// Test that beginning a compute pass before ending the previous pass causes an error.
TEST_F(CommandBufferValidationTest, BeginComputePassBeforeEndPreviousPass) {
    DummyRenderPass dummyRenderPass(device);

    // Beginning a compute pass before ending a render pass causes an error.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder renderPass = encoder.BeginRenderPass(&dummyRenderPass);
        wgpu::ComputePassEncoder computePass = encoder.BeginComputePass();
        computePass.EndPass();
        renderPass.EndPass();
        ASSERT_DEVICE_ERROR(encoder.Finish());
    }

    // Beginning a compute pass before ending a compute pass causes an error.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::ComputePassEncoder computePass1 = encoder.BeginComputePass();
        wgpu::ComputePassEncoder computePass2 = encoder.BeginComputePass();
        computePass2.EndPass();
        computePass1.EndPass();
        ASSERT_DEVICE_ERROR(encoder.Finish());
    }
}

// Test that beginning a render pass before ending the previous pass causes an error.
TEST_F(CommandBufferValidationTest, BeginRenderPassBeforeEndPreviousPass) {
    DummyRenderPass dummyRenderPass(device);

    // Beginning a render pass before ending the render pass causes an error.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder renderPass1 = encoder.BeginRenderPass(&dummyRenderPass);
        wgpu::RenderPassEncoder renderPass2 = encoder.BeginRenderPass(&dummyRenderPass);
        renderPass2.EndPass();
        renderPass1.EndPass();
        ASSERT_DEVICE_ERROR(encoder.Finish());
    }

    // Beginning a compute pass before ending a compute pass causes an error.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::ComputePassEncoder computePass = encoder.BeginComputePass();
        wgpu::RenderPassEncoder renderPass = encoder.BeginRenderPass(&dummyRenderPass);
        renderPass.EndPass();
        computePass.EndPass();
        ASSERT_DEVICE_ERROR(encoder.Finish());
    }
}

// Test that encoding command after a successful finish produces an error
TEST_F(CommandBufferValidationTest, CallsAfterASuccessfulFinish) {
    // A buffer that can be used in CopyBufferToBuffer
    wgpu::BufferDescriptor copyBufferDesc;
    copyBufferDesc.size = 16;
    copyBufferDesc.usage = wgpu::BufferUsage::CopySrc | wgpu::BufferUsage::CopyDst;
    wgpu::Buffer copyBuffer = device.CreateBuffer(&copyBufferDesc);

    wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.Finish();

    ASSERT_DEVICE_ERROR(encoder.CopyBufferToBuffer(copyBuffer, 0, copyBuffer, 0, 0));
}

// Test that encoding command after a failed finish produces an error
TEST_F(CommandBufferValidationTest, CallsAfterAFailedFinish) {
    // A buffer that can be used in CopyBufferToBuffer
    wgpu::BufferDescriptor copyBufferDesc;
    copyBufferDesc.size = 16;
    copyBufferDesc.usage = wgpu::BufferUsage::CopySrc | wgpu::BufferUsage::CopyDst;
    wgpu::Buffer copyBuffer = device.CreateBuffer(&copyBufferDesc);

    // A buffer that can't be used in CopyBufferToBuffer
    wgpu::BufferDescriptor bufferDesc;
    bufferDesc.size = 16;
    bufferDesc.usage = wgpu::BufferUsage::Uniform;
    wgpu::Buffer buffer = device.CreateBuffer(&bufferDesc);

    wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.CopyBufferToBuffer(buffer, 0, buffer, 0, 0);
    ASSERT_DEVICE_ERROR(encoder.Finish());

    ASSERT_DEVICE_ERROR(encoder.CopyBufferToBuffer(copyBuffer, 0, copyBuffer, 0, 0));
}

// Test that passes which are de-referenced prior to ending still allow the correct errors to be
// produced.
TEST_F(CommandBufferValidationTest, PassDereferenced) {
    DummyRenderPass dummyRenderPass(device);

    // Control case, command buffer ended after the pass is ended.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        encoder.Finish();
    }

    // Error case, no reference is kept to a render pass.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        encoder.BeginRenderPass(&dummyRenderPass);
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Command buffer recording ended before [RenderPassEncoder] was ended."));
    }

    // Error case, no reference is kept to a compute pass.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        encoder.BeginComputePass();
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Command buffer recording ended before [ComputePassEncoder] was ended."));
    }

    // Error case, beginning a new pass after failing to end a de-referenced pass.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        encoder.BeginRenderPass(&dummyRenderPass);
        wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
        pass.EndPass();
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Command buffer recording ended before [RenderPassEncoder] was ended."));
    }

    // Error case, deleting the pass after finishing the command encoder shouldn't generate an
    // uncaptured error.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
        ASSERT_DEVICE_ERROR(
            encoder.Finish(),
            HasSubstr("Command buffer recording ended before [ComputePassEncoder] was ended."));

        pass = nullptr;
    }

    // Valid case, command encoder is never finished so the de-referenced pass shouldn't
    // generate an uncaptured error.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        encoder.BeginComputePass();
    }
}

// Test that calling inject validation error produces an error.
TEST_F(CommandBufferValidationTest, InjectValidationError) {
    wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.InjectValidationError("my error");
    ASSERT_DEVICE_ERROR(encoder.Finish(), HasSubstr("my error"));
}

TEST_F(CommandBufferValidationTest, DestroyEncoder) {
    // Skip these tests if we are using wire because the destroy functionality is not exposed
    // and needs to use a cast to call manually. We cannot test this in the wire case since the
    // only way to trigger the destroy call is by losing all references which means we cannot
    // call finish.
    DAWN_SKIP_TEST_IF(UsesWire());
    DummyRenderPass dummyRenderPass(device);

    // Control case, command buffer ended after the pass is ended.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        encoder.Finish();
    }

    // Destroyed encoder with encoded commands should emit error on finish.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        dawn::native::FromAPI(encoder.Get())->Destroy();
        ASSERT_DEVICE_ERROR(encoder.Finish(), HasSubstr("Destroyed encoder cannot be finished."));
    }

    // Destroyed encoder with encoded commands shouldn't emit an error if never finished.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        dawn::native::FromAPI(encoder.Get())->Destroy();
    }

    // Destroyed encoder should allow encoding, and emit error on finish.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        dawn::native::FromAPI(encoder.Get())->Destroy();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        ASSERT_DEVICE_ERROR(encoder.Finish(), HasSubstr("Destroyed encoder cannot be finished."));
    }

    // Destroyed encoder should allow encoding and shouldn't emit an error if never finished.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        dawn::native::FromAPI(encoder.Get())->Destroy();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
    }

    // Destroying a finished encoder should not emit any errors.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&dummyRenderPass);
        pass.EndPass();
        encoder.Finish();
        dawn::native::FromAPI(encoder.Get())->Destroy();
    }

    // Destroying an encoder twice should not emit any errors.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        dawn::native::FromAPI(encoder.Get())->Destroy();
        dawn::native::FromAPI(encoder.Get())->Destroy();
    }

    // Destroying an encoder twice and then calling finish should fail.
    {
        wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
        dawn::native::FromAPI(encoder.Get())->Destroy();
        dawn::native::FromAPI(encoder.Get())->Destroy();
        ASSERT_DEVICE_ERROR(encoder.Finish(), HasSubstr("Destroyed encoder cannot be finished."));
    }
}