/*
 * Copyright 2021 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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.
 */
package io.net5.buffer.api.tests;

import io.net5.buffer.api.Buffer;
import io.net5.buffer.api.BufferAllocator;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

import static org.junit.jupiter.api.Assertions.assertThrows;

public class BufferLongOffsettedAccessorsTest extends BufferTestSupport {
    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongMustBoundsCheckOnNegativeOffset(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            assertThrows(IndexOutOfBoundsException.class, () -> buf.getLong(-1));
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongReadOnlyMustBoundsCheckOnNegativeOffset(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            assertThrows(IndexOutOfBoundsException.class, () -> buf.makeReadOnly().getLong(-1));
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongMustNotBoundsCheckWhenReadOffsetAndSizeIsEqualToWriteOffset(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            long value = 0x0102030405060708L;
            buf.writeLong(value);
            assertEquals(value, buf.getLong(0));
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongMustReadWithDefaultEndianByteOrder(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            long value = 0x0102030405060708L;
            buf.writeLong(value);
            buf.setByte(0, (byte) 0x10);
            assertEquals(0x1002030405060708L, buf.getLong(0));
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongMustBoundsCheckWhenReadOffsetAndSizeIsGreaterThanWriteOffset(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            long value = 0x0102030405060708L;
            buf.writeLong(value);
            assertThrows(IndexOutOfBoundsException.class, () -> buf.getLong(1));
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongReadOnlyMustBoundsCheckWhenReadOffsetAndSizeIsGreaterThanWriteOffset(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            long value = 0x0102030405060708L;
            buf.writeLong(value);
            assertThrows(IndexOutOfBoundsException.class, () -> buf.makeReadOnly().getLong(1));
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongMustNotBoundsCheckWhenReadOffsetIsGreaterThanWriteOffset(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            buf.getLong(0);
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongMustBoundsCheckWhenReadOffsetIsGreaterThanCapacity(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            assertThrows(IndexOutOfBoundsException.class, () -> buf.getLong(8));
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongReadOnlyMustNotBoundsCheckWhenReadOffsetIsGreaterThanWriteOffset(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            buf.makeReadOnly().getLong(0);
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedGetOfLongReadOnlyMustBoundsCheckWhenReadOffsetIsGreaterThanCapacity(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            assertThrows(IndexOutOfBoundsException.class, () -> buf.makeReadOnly().getLong(8));
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedSetOfLongMustBoundsCheckWhenWriteOffsetIsNegative(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            assertEquals(Long.BYTES, buf.capacity());
            long value = 0x0102030405060708L;
            assertThrows(IndexOutOfBoundsException.class, () -> buf.setLong(-1, value));
            buf.writerOffset(Long.BYTES);
            // Verify contents are unchanged.
            assertEquals(0, buf.readLong());
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedSetOfLongMustBoundsCheckWhenWriteOffsetAndSizeIsBeyondCapacity(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            assertEquals(Long.BYTES, buf.capacity());
            long value = 0x0102030405060708L;
            assertThrows(IndexOutOfBoundsException.class, () -> buf.setLong(1, value));
            buf.writerOffset(Long.BYTES);
            // Verify contents are unchanged.
            assertEquals(0, buf.readLong());
        }
    }

    @ParameterizedTest
    @MethodSource("allocators")
    void offsettedSetOfLongMustHaveDefaultEndianByteOrder(Fixture fixture) {
        try (BufferAllocator allocator = fixture.createAllocator();
             Buffer buf = allocator.allocate(8)) {
            long value = 0x0102030405060708L;
            buf.setLong(0, value);
            buf.writerOffset(Long.BYTES);
            assertEquals((byte) 0x01, buf.readByte());
            assertEquals((byte) 0x02, buf.readByte());
            assertEquals((byte) 0x03, buf.readByte());
            assertEquals((byte) 0x04, buf.readByte());
            assertEquals((byte) 0x05, buf.readByte());
            assertEquals((byte) 0x06, buf.readByte());
            assertEquals((byte) 0x07, buf.readByte());
            assertEquals((byte) 0x08, buf.readByte());
        }
    }
}
