// Copyright 2018 the Deno authors. All rights reserved. MIT license.
#include "testing/gtest/include/gtest/gtest.h"

#include "deno.h"

TEST(LibDenoTest, InitializesCorrectly) {
  Deno* d = deno_new(nullptr, nullptr);
  EXPECT_TRUE(deno_execute(d, "a.js", "1 + 2"));
  deno_delete(d);
}

TEST(LibDenoTest, CanCallFunction) {
  Deno* d = deno_new(nullptr, nullptr);
  EXPECT_TRUE(deno_execute(d, "a.js",
                           "if (CanCallFunction() != 'foo') throw Error();"));
  deno_delete(d);
}

TEST(LibDenoTest, ErrorsCorrectly) {
  Deno* d = deno_new(nullptr, nullptr);
  EXPECT_FALSE(deno_execute(d, "a.js", "throw Error()"));
  deno_delete(d);
}

deno_buf strbuf(const char* str) {
  auto len = strlen(str);

  deno_buf buf;
  buf.alloc_ptr = reinterpret_cast<uint8_t*>(strdup(str));
  buf.alloc_len = len + 1;
  buf.data_ptr = buf.alloc_ptr;
  buf.data_len = len;

  return buf;
}

// Same as strbuf but with null alloc_ptr.
deno_buf StrBufNullAllocPtr(const char* str) {
  auto len = strlen(str);
  deno_buf buf;
  buf.alloc_ptr = nullptr;
  buf.alloc_len = 0;
  buf.data_ptr = reinterpret_cast<uint8_t*>(strdup(str));
  buf.data_len = len;
  return buf;
}

void assert_null(deno_buf b) {
  EXPECT_EQ(b.alloc_ptr, nullptr);
  EXPECT_EQ(b.alloc_len, 0u);
  EXPECT_EQ(b.data_ptr, nullptr);
  EXPECT_EQ(b.data_len, 0u);
}

TEST(LibDenoTest, RecvReturnEmpty) {
  static int count = 0;
  Deno* d = deno_new(nullptr, [](auto _, int req_id, auto buf, auto data_buf) {
    assert_null(data_buf);
    count++;
    EXPECT_EQ(static_cast<size_t>(3), buf.data_len);
    EXPECT_EQ(buf.data_ptr[0], 'a');
    EXPECT_EQ(buf.data_ptr[1], 'b');
    EXPECT_EQ(buf.data_ptr[2], 'c');
  });
  EXPECT_TRUE(deno_execute(d, "a.js", "RecvReturnEmpty()"));
  EXPECT_EQ(count, 2);
  deno_delete(d);
}

TEST(LibDenoTest, RecvReturnBar) {
  static int count = 0;
  Deno* d =
      deno_new(nullptr, [](auto deno, int req_id, auto buf, auto data_buf) {
        assert_null(data_buf);
        count++;
        EXPECT_EQ(static_cast<size_t>(3), buf.data_len);
        EXPECT_EQ(buf.data_ptr[0], 'a');
        EXPECT_EQ(buf.data_ptr[1], 'b');
        EXPECT_EQ(buf.data_ptr[2], 'c');
        deno_respond(deno, req_id, strbuf("bar"));
      });
  EXPECT_TRUE(deno_execute(d, "a.js", "RecvReturnBar()"));
  EXPECT_EQ(count, 1);
  deno_delete(d);
}

TEST(LibDenoTest, DoubleRecvFails) {
  Deno* d = deno_new(nullptr, nullptr);
  EXPECT_FALSE(deno_execute(d, "a.js", "DoubleRecvFails()"));
  deno_delete(d);
}

TEST(LibDenoTest, SendRecvSlice) {
  static int count = 0;
  Deno* d =
      deno_new(nullptr, [](auto deno, int req_id, auto buf, auto data_buf) {
        assert_null(data_buf);
        static const size_t alloc_len = 1024;
        size_t i = count++;
        // Check the size and offset of the slice.
        size_t data_offset = buf.data_ptr - buf.alloc_ptr;
        EXPECT_EQ(data_offset, i * 11);
        EXPECT_EQ(buf.data_len, alloc_len - i * 30);
        EXPECT_EQ(buf.alloc_len, alloc_len);
        // Check values written by the JS side.
        EXPECT_EQ(buf.data_ptr[0], 100 + i);
        EXPECT_EQ(buf.data_ptr[buf.data_len - 1], 100 - i);
        // Make copy of the backing buffer -- this is currently necessary
        // because deno_respond() takes ownership over the buffer, but we are
        // not given ownership of `buf` by our caller.
        uint8_t* alloc_ptr = reinterpret_cast<uint8_t*>(malloc(alloc_len));
        memcpy(alloc_ptr, buf.alloc_ptr, alloc_len);
        // Make a slice that is a bit shorter than the original.
        deno_buf buf2{alloc_ptr, alloc_len, alloc_ptr + data_offset,
                      buf.data_len - 19};
        // Place some values into the buffer for the JS side to verify.
        buf2.data_ptr[0] = 200 + i;
        buf2.data_ptr[buf2.data_len - 1] = 200 - i;
        // Send back.
        deno_respond(deno, req_id, buf2);
      });
  EXPECT_TRUE(deno_execute(d, "a.js", "SendRecvSlice()"));
  EXPECT_EQ(count, 5);
  deno_delete(d);
}

TEST(LibDenoTest, JSSendArrayBufferViewTypes) {
  static int count = 0;
  Deno* d = deno_new(nullptr, [](auto _, int req_id, auto buf, auto data_buf) {
    assert_null(data_buf);
    count++;
    size_t data_offset = buf.data_ptr - buf.alloc_ptr;
    EXPECT_EQ(data_offset, 2468u);
    EXPECT_EQ(buf.data_len, 1000u);
    EXPECT_EQ(buf.alloc_len, 4321u);
    EXPECT_EQ(buf.data_ptr[0], count);
  });
  EXPECT_TRUE(deno_execute(d, "a.js", "JSSendArrayBufferViewTypes()"));
  EXPECT_EQ(count, 3);
  deno_delete(d);
}

TEST(LibDenoTest, TypedArraySnapshots) {
  Deno* d = deno_new(nullptr, nullptr);
  EXPECT_TRUE(deno_execute(d, "a.js", "TypedArraySnapshots()"));
  deno_delete(d);
}

TEST(LibDenoTest, SnapshotBug) {
  Deno* d = deno_new(nullptr, nullptr);
  EXPECT_TRUE(deno_execute(d, "a.js", "SnapshotBug()"));
  deno_delete(d);
}

TEST(LibDenoTest, GlobalErrorHandling) {
  static int count = 0;
  Deno* d = deno_new(nullptr, [](auto _, int req_id, auto buf, auto data_buf) {
    assert_null(data_buf);
    count++;
    EXPECT_EQ(static_cast<size_t>(1), buf.data_len);
    EXPECT_EQ(buf.data_ptr[0], 42);
  });
  EXPECT_FALSE(deno_execute(d, "a.js", "GlobalErrorHandling()"));
  EXPECT_EQ(count, 1);
  deno_delete(d);
}

TEST(LibDenoTest, DoubleGlobalErrorHandlingFails) {
  Deno* d = deno_new(nullptr, nullptr);
  EXPECT_FALSE(deno_execute(d, "a.js", "DoubleGlobalErrorHandlingFails()"));
  deno_delete(d);
}

TEST(LibDenoTest, DataBuf) {
  static int count = 0;
  static deno_buf data_buf_copy;
  Deno* d = deno_new(nullptr,
                     [](auto _, int req_id, deno_buf buf, deno_buf data_buf) {
                       count++;
                       data_buf.data_ptr[0] = 4;
                       data_buf.data_ptr[1] = 2;
                       data_buf_copy = data_buf;
                       EXPECT_EQ(2u, buf.data_len);
                       EXPECT_EQ(2u, data_buf.data_len);
                       EXPECT_EQ(buf.data_ptr[0], 1);
                       EXPECT_EQ(buf.data_ptr[1], 2);
                     });
  EXPECT_TRUE(deno_execute(d, "a.js", "DataBuf()"));
  EXPECT_EQ(count, 1);
  // data_buf was subsequently changed in JS, let's check that our copy reflects
  // that.
  EXPECT_EQ(data_buf_copy.data_ptr[0], 9);
  EXPECT_EQ(data_buf_copy.data_ptr[1], 8);
  deno_delete(d);
}