// Copyright 2011 Google Inc. All Rights Reserved.
//
// 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 "clean.h"
#include "build.h"

#include "util.h"
#include "test.h"

#ifndef _WIN32
#include <unistd.h>
#endif

using namespace std;

namespace {

const char kTestFilename[] = "CleanTest-tempfile";

struct CleanTest : public StateTestWithBuiltinRules {
  VirtualFileSystem fs_;
  BuildConfig config_;
  virtual void SetUp() {
    config_.verbosity = BuildConfig::QUIET;
  }
};

TEST_F(CleanTest, CleanAll) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build in1: cat src1\n"
"build out1: cat in1\n"
"build in2: cat src2\n"
"build out2: cat in2\n"));
  fs_.Create("in1", "");
  fs_.Create("out1", "");
  fs_.Create("in2", "");
  fs_.Create("out2", "");

  Cleaner cleaner(&state_, config_, &fs_);

  ASSERT_EQ(0, cleaner.cleaned_files_count());
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(4, cleaner.cleaned_files_count());
  EXPECT_EQ(4u, fs_.files_removed_.size());

  // Check they are removed.
  string err;
  EXPECT_EQ(0, fs_.Stat("in1", &err));
  EXPECT_EQ(0, fs_.Stat("out1", &err));
  EXPECT_EQ(0, fs_.Stat("in2", &err));
  EXPECT_EQ(0, fs_.Stat("out2", &err));
  fs_.files_removed_.clear();

  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(0, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanAllDryRun) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build in1: cat src1\n"
"build out1: cat in1\n"
"build in2: cat src2\n"
"build out2: cat in2\n"));
  fs_.Create("in1", "");
  fs_.Create("out1", "");
  fs_.Create("in2", "");
  fs_.Create("out2", "");

  config_.dry_run = true;
  Cleaner cleaner(&state_, config_, &fs_);

  ASSERT_EQ(0, cleaner.cleaned_files_count());
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(4, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());

  // Check they are not removed.
  string err;
  EXPECT_LT(0, fs_.Stat("in1", &err));
  EXPECT_LT(0, fs_.Stat("out1", &err));
  EXPECT_LT(0, fs_.Stat("in2", &err));
  EXPECT_LT(0, fs_.Stat("out2", &err));
  fs_.files_removed_.clear();

  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(4, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanTarget) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build in1: cat src1\n"
"build out1: cat in1\n"
"build in2: cat src2\n"
"build out2: cat in2\n"));
  fs_.Create("in1", "");
  fs_.Create("out1", "");
  fs_.Create("in2", "");
  fs_.Create("out2", "");

  Cleaner cleaner(&state_, config_, &fs_);

  ASSERT_EQ(0, cleaner.cleaned_files_count());
  ASSERT_EQ(0, cleaner.CleanTarget("out1"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(2u, fs_.files_removed_.size());

  // Check they are removed.
  string err;
  EXPECT_EQ(0, fs_.Stat("in1", &err));
  EXPECT_EQ(0, fs_.Stat("out1", &err));
  EXPECT_LT(0, fs_.Stat("in2", &err));
  EXPECT_LT(0, fs_.Stat("out2", &err));
  fs_.files_removed_.clear();

  ASSERT_EQ(0, cleaner.CleanTarget("out1"));
  EXPECT_EQ(0, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanTargetDryRun) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build in1: cat src1\n"
"build out1: cat in1\n"
"build in2: cat src2\n"
"build out2: cat in2\n"));
  fs_.Create("in1", "");
  fs_.Create("out1", "");
  fs_.Create("in2", "");
  fs_.Create("out2", "");

  config_.dry_run = true;
  Cleaner cleaner(&state_, config_, &fs_);

  ASSERT_EQ(0, cleaner.cleaned_files_count());
  ASSERT_EQ(0, cleaner.CleanTarget("out1"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());

  // Check they are not removed.
  string err;
  EXPECT_LT(0, fs_.Stat("in1", &err));
  EXPECT_LT(0, fs_.Stat("out1", &err));
  EXPECT_LT(0, fs_.Stat("in2", &err));
  EXPECT_LT(0, fs_.Stat("out2", &err));
  fs_.files_removed_.clear();

  ASSERT_EQ(0, cleaner.CleanTarget("out1"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanRule) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule cat_e\n"
"  command = cat -e $in > $out\n"
"build in1: cat_e src1\n"
"build out1: cat in1\n"
"build in2: cat_e src2\n"
"build out2: cat in2\n"));
  fs_.Create("in1", "");
  fs_.Create("out1", "");
  fs_.Create("in2", "");
  fs_.Create("out2", "");

  Cleaner cleaner(&state_, config_, &fs_);

  ASSERT_EQ(0, cleaner.cleaned_files_count());
  ASSERT_EQ(0, cleaner.CleanRule("cat_e"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(2u, fs_.files_removed_.size());

  // Check they are removed.
  string err;
  EXPECT_EQ(0, fs_.Stat("in1", &err));
  EXPECT_LT(0, fs_.Stat("out1", &err));
  EXPECT_EQ(0, fs_.Stat("in2", &err));
  EXPECT_LT(0, fs_.Stat("out2", &err));
  fs_.files_removed_.clear();

  ASSERT_EQ(0, cleaner.CleanRule("cat_e"));
  EXPECT_EQ(0, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanRuleDryRun) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule cat_e\n"
"  command = cat -e $in > $out\n"
"build in1: cat_e src1\n"
"build out1: cat in1\n"
"build in2: cat_e src2\n"
"build out2: cat in2\n"));
  fs_.Create("in1", "");
  fs_.Create("out1", "");
  fs_.Create("in2", "");
  fs_.Create("out2", "");

  config_.dry_run = true;
  Cleaner cleaner(&state_, config_, &fs_);

  ASSERT_EQ(0, cleaner.cleaned_files_count());
  ASSERT_EQ(0, cleaner.CleanRule("cat_e"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());

  // Check they are not removed.
  string err;
  EXPECT_LT(0, fs_.Stat("in1", &err));
  EXPECT_LT(0, fs_.Stat("out1", &err));
  EXPECT_LT(0, fs_.Stat("in2", &err));
  EXPECT_LT(0, fs_.Stat("out2", &err));
  fs_.files_removed_.clear();

  ASSERT_EQ(0, cleaner.CleanRule("cat_e"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanRuleGenerator) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule regen\n"
"  command = cat $in > $out\n"
"  generator = 1\n"
"build out1: cat in1\n"
"build out2: regen in2\n"));
  fs_.Create("out1", "");
  fs_.Create("out2", "");

  Cleaner cleaner(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(1, cleaner.cleaned_files_count());
  EXPECT_EQ(1u, fs_.files_removed_.size());

  fs_.Create("out1", "");

  EXPECT_EQ(0, cleaner.CleanAll(/*generator=*/true));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(2u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanDepFile) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule cc\n"
"  command = cc $in > $out\n"
"  depfile = $out.d\n"
"build out1: cc in1\n"));
  fs_.Create("out1", "");
  fs_.Create("out1.d", "");

  Cleaner cleaner(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(2u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanDepFileOnCleanTarget) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule cc\n"
"  command = cc $in > $out\n"
"  depfile = $out.d\n"
"build out1: cc in1\n"));
  fs_.Create("out1", "");
  fs_.Create("out1.d", "");

  Cleaner cleaner(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner.CleanTarget("out1"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(2u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanDepFileOnCleanRule) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule cc\n"
"  command = cc $in > $out\n"
"  depfile = $out.d\n"
"build out1: cc in1\n"));
  fs_.Create("out1", "");
  fs_.Create("out1.d", "");

  Cleaner cleaner(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner.CleanRule("cc"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(2u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanDyndep) {
  // Verify that a dyndep file can be loaded to discover a new output
  // to be cleaned.
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build out: cat in || dd\n"
"  dyndep = dd\n"
  ));
  fs_.Create("in", "");
  fs_.Create("dd",
"ninja_dyndep_version = 1\n"
"build out | out.imp: dyndep\n"
);
  fs_.Create("out", "");
  fs_.Create("out.imp", "");

  Cleaner cleaner(&state_, config_, &fs_);

  ASSERT_EQ(0, cleaner.cleaned_files_count());
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(2u, fs_.files_removed_.size());

  string err;
  EXPECT_EQ(0, fs_.Stat("out", &err));
  EXPECT_EQ(0, fs_.Stat("out.imp", &err));
}

TEST_F(CleanTest, CleanDyndepMissing) {
  // Verify that a missing dyndep file is tolerated.
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build out: cat in || dd\n"
"  dyndep = dd\n"
  ));
  fs_.Create("in", "");
  fs_.Create("out", "");
  fs_.Create("out.imp", "");

  Cleaner cleaner(&state_, config_, &fs_);

  ASSERT_EQ(0, cleaner.cleaned_files_count());
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(1, cleaner.cleaned_files_count());
  EXPECT_EQ(1u, fs_.files_removed_.size());

  string err;
  EXPECT_EQ(0, fs_.Stat("out", &err));
  EXPECT_EQ(1, fs_.Stat("out.imp", &err));
}

TEST_F(CleanTest, CleanRspFile) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule cc\n"
"  command = cc $in > $out\n"
"  rspfile = $rspfile\n"
"  rspfile_content=$in\n"
"build out1: cc in1\n"
"  rspfile = cc1.rsp\n"));
  fs_.Create("out1", "");
  fs_.Create("cc1.rsp", "");

  Cleaner cleaner(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_EQ(2u, fs_.files_removed_.size());
}

TEST_F(CleanTest, CleanRsp) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule cat_rsp \n"
"  command = cat $rspfile > $out\n"
"  rspfile = $rspfile\n"
"  rspfile_content = $in\n"
"build in1: cat src1\n"
"build out1: cat in1\n"
"build in2: cat_rsp src2\n"
"  rspfile=in2.rsp\n"
"build out2: cat_rsp in2\n"
"  rspfile=out2.rsp\n"
));
  fs_.Create("in1", "");
  fs_.Create("out1", "");
  fs_.Create("in2.rsp", "");
  fs_.Create("out2.rsp", "");
  fs_.Create("in2", "");
  fs_.Create("out2", "");

  Cleaner cleaner(&state_, config_, &fs_);
  ASSERT_EQ(0, cleaner.cleaned_files_count());
  ASSERT_EQ(0, cleaner.CleanTarget("out1"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  ASSERT_EQ(0, cleaner.CleanTarget("in2"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  ASSERT_EQ(0, cleaner.CleanRule("cat_rsp"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());

  EXPECT_EQ(6u, fs_.files_removed_.size());

  // Check they are removed.
  string err;
  EXPECT_EQ(0, fs_.Stat("in1", &err));
  EXPECT_EQ(0, fs_.Stat("out1", &err));
  EXPECT_EQ(0, fs_.Stat("in2", &err));
  EXPECT_EQ(0, fs_.Stat("out2", &err));
  EXPECT_EQ(0, fs_.Stat("in2.rsp", &err));
  EXPECT_EQ(0, fs_.Stat("out2.rsp", &err));
}

TEST_F(CleanTest, CleanFailure) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
                                      "build dir: cat src1\n"));
  fs_.MakeDir("dir");
  Cleaner cleaner(&state_, config_, &fs_);
  EXPECT_NE(0, cleaner.CleanAll());
}

TEST_F(CleanTest, CleanPhony) {
  string err;
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build phony: phony t1 t2\n"
"build t1: cat\n"
"build t2: cat\n"));

  fs_.Create("phony", "");
  fs_.Create("t1", "");
  fs_.Create("t2", "");

  // Check that CleanAll does not remove "phony".
  Cleaner cleaner(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_LT(0, fs_.Stat("phony", &err));

  fs_.Create("t1", "");
  fs_.Create("t2", "");

  // Check that CleanTarget does not remove "phony".
  EXPECT_EQ(0, cleaner.CleanTarget("phony"));
  EXPECT_EQ(2, cleaner.cleaned_files_count());
  EXPECT_LT(0, fs_.Stat("phony", &err));
}

TEST_F(CleanTest, CleanDepFileAndRspFileWithSpaces) {
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"rule cc_dep\n"
"  command = cc $in > $out\n"
"  depfile = $out.d\n"
"rule cc_rsp\n"
"  command = cc $in > $out\n"
"  rspfile = $out.rsp\n"
"  rspfile_content = $in\n"
"build out$ 1: cc_dep in$ 1\n"
"build out$ 2: cc_rsp in$ 1\n"
));
  fs_.Create("out 1", "");
  fs_.Create("out 2", "");
  fs_.Create("out 1.d", "");
  fs_.Create("out 2.rsp", "");

  Cleaner cleaner(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner.CleanAll());
  EXPECT_EQ(4, cleaner.cleaned_files_count());
  EXPECT_EQ(4u, fs_.files_removed_.size());

  string err;
  EXPECT_EQ(0, fs_.Stat("out 1", &err));
  EXPECT_EQ(0, fs_.Stat("out 2", &err));
  EXPECT_EQ(0, fs_.Stat("out 1.d", &err));
  EXPECT_EQ(0, fs_.Stat("out 2.rsp", &err));
}

struct CleanDeadTest : public CleanTest, public BuildLogUser{
  virtual void SetUp() {
    // In case a crashing test left a stale file behind.
    unlink(kTestFilename);
    CleanTest::SetUp();
  }
  virtual void TearDown() {
    unlink(kTestFilename);
  }
  virtual bool IsPathDead(StringPiece) const { return false; }
};

TEST_F(CleanDeadTest, CleanDead) {
  State state;
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state,
"rule cat\n"
"  command = cat $in > $out\n"
"build out1: cat in\n"
"build out2: cat in\n"
));
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build out2: cat in\n"
));
  fs_.Create("in", "");
  fs_.Create("out1", "");
  fs_.Create("out2", "");

  BuildLog log1;
  string err;
  EXPECT_TRUE(log1.OpenForWrite(kTestFilename, *this, &err));
  ASSERT_EQ("", err);
  log1.RecordCommand(state.edges_[0], 15, 18);
  log1.RecordCommand(state.edges_[1], 20, 25);
  log1.Close();

  BuildLog log2;
  EXPECT_TRUE(log2.Load(kTestFilename, &err));
  ASSERT_EQ("", err);
  ASSERT_EQ(2u, log2.entries().size());
  ASSERT_TRUE(log2.LookupByOutput("out1"));
  ASSERT_TRUE(log2.LookupByOutput("out2"));

  // First use the manifest that describe how to build out1.
  Cleaner cleaner1(&state, config_, &fs_);
  EXPECT_EQ(0, cleaner1.CleanDead(log2.entries()));
  EXPECT_EQ(0, cleaner1.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
  EXPECT_NE(0, fs_.Stat("in", &err));
  EXPECT_NE(0, fs_.Stat("out1", &err));
  EXPECT_NE(0, fs_.Stat("out2", &err));

  // Then use the manifest that does not build out1 anymore.
  Cleaner cleaner2(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner2.CleanDead(log2.entries()));
  EXPECT_EQ(1, cleaner2.cleaned_files_count());
  EXPECT_EQ(1u, fs_.files_removed_.size());
  EXPECT_EQ("out1", *(fs_.files_removed_.begin()));
  EXPECT_NE(0, fs_.Stat("in", &err));
  EXPECT_EQ(0, fs_.Stat("out1", &err));
  EXPECT_NE(0, fs_.Stat("out2", &err));

  // Nothing to do now.
  EXPECT_EQ(0, cleaner2.CleanDead(log2.entries()));
  EXPECT_EQ(0, cleaner2.cleaned_files_count());
  EXPECT_EQ(1u, fs_.files_removed_.size());
  EXPECT_EQ("out1", *(fs_.files_removed_.begin()));
  EXPECT_NE(0, fs_.Stat("in", &err));
  EXPECT_EQ(0, fs_.Stat("out1", &err));
  EXPECT_NE(0, fs_.Stat("out2", &err));
  log2.Close();
}

TEST_F(CleanDeadTest, CleanDeadPreservesInputs) {
  State state;
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state,
"rule cat\n"
"  command = cat $in > $out\n"
"build out1: cat in\n"
"build out2: cat in\n"
));
  // This manifest does not build out1 anymore, but makes
  // it an implicit input. CleanDead should detect this
  // and preserve it.
  ASSERT_NO_FATAL_FAILURE(AssertParse(&state_,
"build out2: cat in | out1\n"
));
  fs_.Create("in", "");
  fs_.Create("out1", "");
  fs_.Create("out2", "");

  BuildLog log1;
  string err;
  EXPECT_TRUE(log1.OpenForWrite(kTestFilename, *this, &err));
  ASSERT_EQ("", err);
  log1.RecordCommand(state.edges_[0], 15, 18);
  log1.RecordCommand(state.edges_[1], 20, 25);
  log1.Close();

  BuildLog log2;
  EXPECT_TRUE(log2.Load(kTestFilename, &err));
  ASSERT_EQ("", err);
  ASSERT_EQ(2u, log2.entries().size());
  ASSERT_TRUE(log2.LookupByOutput("out1"));
  ASSERT_TRUE(log2.LookupByOutput("out2"));

  // First use the manifest that describe how to build out1.
  Cleaner cleaner1(&state, config_, &fs_);
  EXPECT_EQ(0, cleaner1.CleanDead(log2.entries()));
  EXPECT_EQ(0, cleaner1.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
  EXPECT_NE(0, fs_.Stat("in", &err));
  EXPECT_NE(0, fs_.Stat("out1", &err));
  EXPECT_NE(0, fs_.Stat("out2", &err));

  // Then use the manifest that does not build out1 anymore.
  Cleaner cleaner2(&state_, config_, &fs_);
  EXPECT_EQ(0, cleaner2.CleanDead(log2.entries()));
  EXPECT_EQ(0, cleaner2.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
  EXPECT_NE(0, fs_.Stat("in", &err));
  EXPECT_NE(0, fs_.Stat("out1", &err));
  EXPECT_NE(0, fs_.Stat("out2", &err));

  // Nothing to do now.
  EXPECT_EQ(0, cleaner2.CleanDead(log2.entries()));
  EXPECT_EQ(0, cleaner2.cleaned_files_count());
  EXPECT_EQ(0u, fs_.files_removed_.size());
  EXPECT_NE(0, fs_.Stat("in", &err));
  EXPECT_NE(0, fs_.Stat("out1", &err));
  EXPECT_NE(0, fs_.Stat("out2", &err));
  log2.Close();
}
}  // anonymous namespace