#!/bin/bash
#
# Copyright 2015 The Bazel Authors. 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.

set -eu

# Load the test setup defined in the parent directory
CURRENT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "${CURRENT_DIR}/../integration_test_setup.sh" \
  || { echo "integration_test_setup.sh not found!" >&2; exit 1; }

function test_cc_test_coverage() {
  if [[ ! -x /usr/bin/lcov ]]; then
    echo "lcov not installed. Skipping test."
    return
  fi

  cat << EOF > BUILD
cc_library(
    name = "a",
    srcs = ["a.cc"],
    hdrs = ["a.h"],
)

cc_test(
    name = "t",
    srcs = ["t.cc"],
    deps = [":a"],
)
EOF

  cat << EOF > a.h
int a(bool what);
EOF

  cat << EOF > a.cc
#include "a.h"

int a(bool what) {
  if (what) {
    return 1;
  } else {
    return 2;
  }
}
EOF

  cat << EOF > t.cc
#include <stdio.h>
#include "a.h"

int main(void) {
  a(true);
}
EOF

  bazel coverage --test_output=all --build_event_text_file=bep.txt //:t \
      &>$TEST_log || fail "Coverage for //:t failed"

  ending_part=$(sed -n -e '/PASSED/,$p' $TEST_log)

  coverage_file_path=$(grep -Eo "/[/a-zA-Z0-9\.\_\-]+\.dat$" <<< "$ending_part")
  [ -e $coverage_file_path ] || fail "Coverage output file does not exist!"

  # Check if a.cc is in the coverage file
  assert_contains "^SF:.*a.cc$" "$coverage_file_path"
  # Check if the only branch in a() has correct coverage:
  assert_contains "^DA:5,1$" "$coverage_file_path"  # true branch should be taken
  assert_contains "^DA:7,0$" "$coverage_file_path"  # false branch should not be

  # Verify the files are reported correctly in the build event protocol.
  assert_contains 'name: "test.lcov"' bep.txt
  assert_contains 'name: "baseline.lcov"' bep.txt

  # Verify that this is also true for cached coverage actions.
  bazel coverage --test_output=all --build_event_text_file=bep.txt //:t \
      &>$TEST_log || fail "Coverage for //:t failed"
  expect_log '//:t.*cached'
  assert_contains 'name: "test.lcov"' bep.txt
  assert_contains 'name: "baseline.lcov"' bep.txt
}

function test_failed_coverage() {
  if [[ ! -x /usr/bin/lcov ]]; then
    echo "lcov not installed. Skipping test."
    return
  fi

  cat << EOF > BUILD
cc_library(
    name = "a",
    srcs = ["a.cc"],
    hdrs = ["a.h"],
)

cc_test(
    name = "t",
    srcs = ["t.cc"],
    deps = [":a"],
)
EOF

  cat << EOF > a.h
int a();
EOF

  cat << EOF > a.cc
#include "a.h"

int a() {
  return 1;
}
EOF

  cat << EOF > t.cc
#include <stdio.h>
#include "a.h"

int main(void) {
  return a();
}
EOF

  bazel coverage --test_output=all --build_event_text_file=bep.txt //:t \
      &>$TEST_log && fail "Expected test failure" || :

  # Verify that coverage data is still reported.
  assert_contains 'name: "test.lcov"' bep.txt
}

function test_java_test_coverage() {

  cat <<EOF > BUILD
java_test(
    name = "test",
    srcs = glob(["src/test/**/*.java"]),
    test_class = "com.example.TestCollatz",
    deps = [":collatz-lib"],
)

java_library(
    name = "collatz-lib",
    srcs = glob(["src/main/**/*.java"]),
)
EOF

  mkdir -p src/main/com/example
  cat <<EOF > src/main/com/example/Collatz.java
package com.example;

public class Collatz {

  public static int getCollatzFinal(int n) {
    if (n == 1) {
      return 1;
    }
    if (n % 2 == 0) {
      return getCollatzFinal(n / 2);
    } else {
      return getCollatzFinal(n * 3 + 1);
    }
  }

}
EOF

  mkdir -p src/test/com/example
  cat <<EOF > src/test/com/example/TestCollatz.java
package com.example;

import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class TestCollatz {

  @Test
  public void testGetCollatzFinal() {
    assertEquals(Collatz.getCollatzFinal(1), 1);
    assertEquals(Collatz.getCollatzFinal(5), 1);
    assertEquals(Collatz.getCollatzFinal(10), 1);
    assertEquals(Collatz.getCollatzFinal(21), 1);
  }

}
EOF

  bazel coverage //:test &>$TEST_log || fail "Coverage for //:test failed"
  cat $TEST_log
  ending_part=$(sed -n -e '/PASSED/,$p' $TEST_log)

  coverage_file_path=$(grep -Eo "/[/a-zA-Z0-9\.\_\-]+\.dat$" <<< "$ending_part")
  [ -e $coverage_file_path ] || fail "Coverage output file does not exist!"

  cat <<EOF > result.dat
SF:com/example/Collatz.java
FN:3,com/example/Collatz::<init> ()V
FNDA:0,com/example/Collatz::<init> ()V
FN:6,com/example/Collatz::getCollatzFinal (I)I
FNDA:1,com/example/Collatz::getCollatzFinal (I)I
BA:6,2
BA:6,2
BA:9,2
BA:9,2
DA:3,0
DA:6,3
DA:7,2
DA:9,4
DA:10,5
DA:12,7
end_of_record
EOF

  if ! cmp result.dat $coverage_file_path; then
    fail "Coverage output file is different with expected"
  fi
}

function test_java_test_java_import_coverage() {

  cat <<EOF > BUILD
java_test(
    name = "test",
    srcs = glob(["src/test/**/*.java"]),
    test_class = "com.example.TestCollatz",
    deps = [":collatz-import"],
)

java_import(
    name = "collatz-import",
    jars = [":libcollatz-lib.jar"],
)

java_library(
    name = "collatz-lib",
    srcs = glob(["src/main/**/*.java"]),
)
EOF

  mkdir -p src/main/com/example
  cat <<EOF > src/main/com/example/Collatz.java
package com.example;

public class Collatz {

  public static int getCollatzFinal(int n) {
    if (n == 1) {
      return 1;
    }
    if (n % 2 == 0) {
      return getCollatzFinal(n / 2);
    } else {
      return getCollatzFinal(n * 3 + 1);
    }
  }

}
EOF

  mkdir -p src/test/com/example
  cat <<EOF > src/test/com/example/TestCollatz.java
package com.example;

import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class TestCollatz {

  @Test
  public void testGetCollatzFinal() {
    assertEquals(Collatz.getCollatzFinal(1), 1);
    assertEquals(Collatz.getCollatzFinal(5), 1);
    assertEquals(Collatz.getCollatzFinal(10), 1);
    assertEquals(Collatz.getCollatzFinal(21), 1);
  }

}
EOF

  bazel coverage --experimental_java_coverage //:test &>$TEST_log || fail "Coverage for //:test failed"
  ending_part=$(sed -n -e '/PASSED/,$p' $TEST_log)

  coverage_file_path=$(grep -Eo "/[/a-zA-Z0-9\.\_\-]+\.dat$" <<< "$ending_part")
  [ -e $coverage_file_path ] || fail "Coverage output file not exists!"

  cat <<EOF > result.dat
SF:src/main/com/example/Collatz.java
FN:3,com/example/Collatz::<init> ()V
FNDA:0,com/example/Collatz::<init> ()V
FN:6,com/example/Collatz::getCollatzFinal (I)I
FNDA:1,com/example/Collatz::getCollatzFinal (I)I
BA:6,2
BA:6,2
BA:9,2
BA:9,2
DA:3,0
DA:6,3
DA:7,2
DA:9,4
DA:10,5
DA:12,7
end_of_record
EOF

  cmp result.dat "$coverage_file_path" || fail "Coverage output file is different than the expected file"
}

run_suite "test tests"