// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "xfa/fxfa/fm2js/cxfa_fmparser.h"

#include <vector>

#include "core/fxcrt/cfx_widetextbuf.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/test_support.h"
#include "third_party/base/ptr_util.h"
#include "xfa/fxfa/fm2js/cxfa_fmtojavascriptdepth.h"

TEST(CXFA_FMParserTest, Empty) {
  auto parser = pdfium::MakeUnique<CXFA_FMParser>(L"");
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast);
  EXPECT_FALSE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  // TODO(dsinclair): This is a little weird .....
  EXPECT_STREQ(L"// comments only", buf.MakeString().c_str());
}

TEST(CXFA_FMParserTest, CommentOnlyIsError) {
  auto parser = pdfium::MakeUnique<CXFA_FMParser>(L"; Just comment");
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast);
  // TODO(dsinclair): This isn't allowed per the spec.
  EXPECT_FALSE(parser->HasError());
  // EXPECT_TRUE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  EXPECT_STREQ(L"// comments only", buf.MakeString().c_str());
}

TEST(CXFA_FMParserTest, CommentThenValue) {
  const wchar_t ret[] =
      LR"***((function() {
let pfm_method_runner = function(obj, cb) {
  if (pfm_rt.is_ary(obj)) {
    let pfm_method_return = null;
    for (var idx = obj.length -1; idx > 1; idx--) {
      pfm_method_return = cb(obj[idx]);
    }
    return pfm_method_return;
  }
  return cb(obj);
};
var pfm_ret = null;
pfm_ret = 12;
return pfm_rt.get_val(pfm_ret);
}).call(this);)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(L"; Just comment\n12");
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast);
  EXPECT_FALSE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  EXPECT_STREQ(ret, buf.MakeString().c_str());
}

TEST(CXFA_FMParserTest, Parse) {
  const wchar_t input[] =
      LR"***($ = Avg (-3, 5, -6, 12, -13);
$ = Avg (Table2..Row[*].Cell1);
if ($ ne -1)then
  border.fill.color.value = "255,64,64";
elseif ($ ne -2) then
  border.fill.color.value = "128,128,128";
else
  border.fill.color.value = "20,170,13";
endif
$)***";

  const wchar_t ret[] =
      LR"***((function() {
let pfm_method_runner = function(obj, cb) {
  if (pfm_rt.is_ary(obj)) {
    let pfm_method_return = null;
    for (var idx = obj.length -1; idx > 1; idx--) {
      pfm_method_return = cb(obj[idx]);
    }
    return pfm_method_return;
  }
  return cb(obj);
};
var pfm_ret = null;
if (pfm_rt.is_obj(this))
{
pfm_rt.asgn_val_op(this, pfm_rt.Avg(pfm_rt.neg_op(3), 5, pfm_rt.neg_op(6), 12, pfm_rt.neg_op(13)));
}
if (pfm_rt.is_obj(this))
{
pfm_rt.asgn_val_op(this, pfm_rt.Avg(pfm_rt.dot_acc(pfm_rt.dotdot_acc(Table2, "Table2", "Row", 1), "", "Cell1", 0, 0)));
}
if (pfm_rt.get_val(pfm_rt.neq_op(this, pfm_rt.neg_op(1))))
{
if (pfm_rt.is_obj(pfm_rt.dot_acc(pfm_rt.dot_acc(pfm_rt.dot_acc(border, "border", "fill", 0, 0), "", "color", 0, 0), "", "value", 0, 0)))
{
pfm_rt.asgn_val_op(pfm_rt.dot_acc(pfm_rt.dot_acc(pfm_rt.dot_acc(border, "border", "fill", 0, 0), "", "color", 0, 0), "", "value", 0, 0), "255,64,64");
}
}
else if (pfm_rt.get_val(pfm_rt.neq_op(this, pfm_rt.neg_op(2))))
{
if (pfm_rt.is_obj(pfm_rt.dot_acc(pfm_rt.dot_acc(pfm_rt.dot_acc(border, "border", "fill", 0, 0), "", "color", 0, 0), "", "value", 0, 0)))
{
pfm_rt.asgn_val_op(pfm_rt.dot_acc(pfm_rt.dot_acc(pfm_rt.dot_acc(border, "border", "fill", 0, 0), "", "color", 0, 0), "", "value", 0, 0), "128,128,128");
}
}
else {
if (pfm_rt.is_obj(pfm_rt.dot_acc(pfm_rt.dot_acc(pfm_rt.dot_acc(border, "border", "fill", 0, 0), "", "color", 0, 0), "", "value", 0, 0)))
{
pfm_rt.asgn_val_op(pfm_rt.dot_acc(pfm_rt.dot_acc(pfm_rt.dot_acc(border, "border", "fill", 0, 0), "", "color", 0, 0), "", "value", 0, 0), "20,170,13");
}
}
pfm_ret = this;
return pfm_rt.get_val(pfm_ret);
}).call(this);)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast);
  EXPECT_FALSE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  EXPECT_EQ(ret, buf.AsStringView());
}

TEST(CXFA_FMParserTest, MaxParseDepth) {
  auto parser = pdfium::MakeUnique<CXFA_FMParser>(L"foo(bar[baz(fizz[0])])");
  parser->SetMaxParseDepthForTest(5);
  EXPECT_EQ(nullptr, parser->Parse());
  EXPECT_TRUE(parser->HasError());
}

TEST(CFXA_FMParserTest, chromium752201) {
  auto parser = pdfium::MakeUnique<CXFA_FMParser>(
      LR"***(fTep a
.#
fo@ =[=l)***");
  EXPECT_EQ(nullptr, parser->Parse());
  EXPECT_TRUE(parser->HasError());
}

TEST(CXFA_FMParserTest, MultipleAssignmentIsNotAllowed) {
  auto parser = pdfium::MakeUnique<CXFA_FMParser>(L"(a=(b=t))=u");

  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(!ast);
  EXPECT_TRUE(parser->HasError());
}

TEST(CXFA_FMParserTest, ParseFuncWithParams) {
  const wchar_t input[] =
      LR"***(func MyFunction(param1, param2) do
  param1 * param2
endfunc)***";

  const wchar_t ret[] =
      LR"***((function() {
let pfm_method_runner = function(obj, cb) {
  if (pfm_rt.is_ary(obj)) {
    let pfm_method_return = null;
    for (var idx = obj.length -1; idx > 1; idx--) {
      pfm_method_return = cb(obj[idx]);
    }
    return pfm_method_return;
  }
  return cb(obj);
};
var pfm_ret = null;
function MyFunction(param1, param2) {
var pfm_ret = null;
pfm_ret = pfm_rt.mul_op(param1, param2);
return pfm_ret;
}
return pfm_rt.get_val(pfm_ret);
}).call(this);)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast);
  EXPECT_FALSE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  EXPECT_STREQ(ret, buf.MakeString().c_str());
}

TEST(CXFA_FMParserTest, ParseFuncWithoutParams) {
  const wchar_t input[] =
      LR"***(func MyFunction() do
  42
endfunc)***";

  const wchar_t ret[] =
      LR"***((function() {
let pfm_method_runner = function(obj, cb) {
  if (pfm_rt.is_ary(obj)) {
    let pfm_method_return = null;
    for (var idx = obj.length -1; idx > 1; idx--) {
      pfm_method_return = cb(obj[idx]);
    }
    return pfm_method_return;
  }
  return cb(obj);
};
var pfm_ret = null;
function MyFunction() {
var pfm_ret = null;
pfm_ret = 42;
return pfm_ret;
}
return pfm_rt.get_val(pfm_ret);
}).call(this);)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast);
  EXPECT_FALSE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  EXPECT_STREQ(ret, buf.MakeString().c_str());
}

TEST(CXFA_FMParserTest, ParseFuncWithBadParamsList) {
  const wchar_t input[] =
      LR"***(func MyFunction(param1,) do
  param1 * param2
endfunc)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast == nullptr);
  EXPECT_TRUE(parser->HasError());
}

TEST(CXFA_FMParserTest, ParseBadIfExpression) {
  const wchar_t input[] = L"if ( then";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast == nullptr);
  EXPECT_TRUE(parser->HasError());
}

TEST(CXFA_FMParserTest, ParseBadElseIfExpression) {
  const wchar_t input[] =
      LR"***(if ($ ne -1) then"
elseif( then)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  ASSERT_TRUE(ast == nullptr);
  EXPECT_TRUE(parser->HasError());
}

TEST(CXFA_FMParserTest, ParseDepthWithWideTree) {
  const wchar_t input[] = L"a <> b <> c <> d <> e <> f <> g <> h <> i <> j";

  {
    auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
    std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
    ASSERT_TRUE(ast);
    EXPECT_TRUE(!parser->HasError());
  }

  {
    auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
    parser->SetMaxParseDepthForTest(5);
    std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
    ASSERT_TRUE(ast == nullptr);
    EXPECT_TRUE(parser->HasError());
  }
}

TEST(CXFA_FMParserTest, ParseCallSmall) {
  const wchar_t input[] = L"i.f(O)";
  const wchar_t ret[] =
      LR"***((function() {
let pfm_method_runner = function(obj, cb) {
  if (pfm_rt.is_ary(obj)) {
    let pfm_method_return = null;
    for (var idx = obj.length -1; idx > 1; idx--) {
      pfm_method_return = cb(obj[idx]);
    }
    return pfm_method_return;
  }
  return cb(obj);
};
var pfm_ret = null;
pfm_ret = pfm_rt.get_val((function() {
  return pfm_method_runner(i, function(obj) {
    return obj.f(pfm_rt.get_val(O));
  });
}).call(this));
return pfm_rt.get_val(pfm_ret);
}).call(this);)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  EXPECT_FALSE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  EXPECT_STREQ(ret, buf.MakeString().c_str());
}

TEST(CXFA_FMParserTest, ParseCallBig) {
  const wchar_t input[] = L"i.f(O.e(O.e(O)))";
  const wchar_t ret[] =
      LR"***((function() {
let pfm_method_runner = function(obj, cb) {
  if (pfm_rt.is_ary(obj)) {
    let pfm_method_return = null;
    for (var idx = obj.length -1; idx > 1; idx--) {
      pfm_method_return = cb(obj[idx]);
    }
    return pfm_method_return;
  }
  return cb(obj);
};
var pfm_ret = null;
pfm_ret = pfm_rt.get_val((function() {
  return pfm_method_runner(i, function(obj) {
    return obj.f(pfm_rt.get_val((function() {
  return pfm_method_runner(O, function(obj) {
    return obj.e(pfm_rt.get_val((function() {
  return pfm_method_runner(O, function(obj) {
    return obj.e(pfm_rt.get_val(O));
  });
}).call(this)));
  });
}).call(this)));
  });
}).call(this));
return pfm_rt.get_val(pfm_ret);
}).call(this);)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  EXPECT_FALSE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  EXPECT_STREQ(ret, buf.MakeString().c_str());
}

TEST(CXFA_FMParserTest, ParseVar) {
  const wchar_t input[] = LR"(var s = "")";
  const wchar_t ret[] =
      LR"***((function() {
let pfm_method_runner = function(obj, cb) {
  if (pfm_rt.is_ary(obj)) {
    let pfm_method_return = null;
    for (var idx = obj.length -1; idx > 1; idx--) {
      pfm_method_return = cb(obj[idx]);
    }
    return pfm_method_return;
  }
  return cb(obj);
};
var pfm_ret = null;
var s = "";
s = pfm_rt.var_filter(s);
pfm_ret = s;
return pfm_rt.get_val(pfm_ret);
}).call(this);)***";

  auto parser = pdfium::MakeUnique<CXFA_FMParser>(input);
  std::unique_ptr<CXFA_FMAST> ast = parser->Parse();
  EXPECT_FALSE(parser->HasError());

  CXFA_FMToJavaScriptDepth::Reset();
  CFX_WideTextBuf buf;
  EXPECT_TRUE(ast->ToJavaScript(&buf));
  EXPECT_STREQ(ret, buf.MakeString().c_str());
}