#!/usr/bin/env python

"""
This script prepares this ONOS directory so that the Sonar Scanner can be run.
  - Build ONOS
  - Run coverage tests on a per module basis, stage surefire-reports and jacoco.exec
  - Generate sonar-project.properties file
"""

import os
import sys
import fnmatch

from shutil import copy, rmtree
from subprocess import check_output, STDOUT, CalledProcessError

ONOS_VERSION = '2.0.0-SNAPSHOT'

GENFILES = 'bazel-genfiles'
SONAR_PROJECT = GENFILES + '/sonar-project'
SUREFIRE_REPORTS = 'surefire-reports'
SONAR_PROPERTIES_FILE_NAME = SONAR_PROJECT + '/sonar-project.properties'

# Template for the sonar properties file
ROOT_TEMPLATE = '''# Auto-generated properties file
sonar.projectKey=%(key)s
sonar.projectName=%(name)s
sonar.projectVersion=%(version)s

sonar.sourceEncoding=UTF-8
sonar.java.target = 1.8
sonar.java.source = 1.8
sonar.language=java

sonar.junit.reportsPath = surefire-reports
sonar.jacoco.reportPath = jacoco.exec

sonar.modules=%(modules)s

'''


def split_target(target):
    path, module = target.split(':', 2)
    path = path.replace('//', '', 1)
    return path, module


def run_command(cmd):
    output = check_output(cmd).rstrip()
    return output.split('\n') if output else []


def run_command_with_stderr(cmd):
    output = check_output(cmd, stderr=STDOUT).rstrip()
    return output.split('\n') if output else []


def make_dirs(path):
    try:
        os.makedirs(path)
    except OSError:
        pass


def find_bazel_project():
    return os.path.basename(os.getcwd())


def find_bazel_classes_directory(module_name, path):
    bazel_bin_marker = "bazel-bin:"
    bazel_bin_dir = ""
    info = run_command(["bazel", "info"])
    for bin_dir in info:
        if bin_dir.startswith(bazel_bin_marker):
            bazel_bin_dir = bin_dir.replace(bazel_bin_marker, "")
            break
    return bazel_bin_dir


def capture_surefire_reports(module_path):
    matches = []
    for root, dirnames, filenames in os.walk('bazel-testlogs/' + module_path + '/src/test/java'):
        for filename in fnmatch.filter(filenames, '*.xml'):
            source_path = os.path.join(root, filename)
            matches.append(source_path)

            destination_path = \
                SONAR_PROJECT + "/" + module_path + "/" + SUREFIRE_REPORTS + "/TEST-" + \
                source_path.replace("bazel-testlogs/", "")\
                .replace("/test.xml", "test.xml")\
                .replace(module_path, "")\
                .replace("/src/test/java/", "")\
                .replace("/", ".")
            make_dirs(path=os.path.dirname(destination_path))
            copy(source_path, destination_path)


def capture_jacoco(module_path):
    source_path = '/tmp/jacoco.exec'
    destination_path = \
        SONAR_PROJECT + "/" + module_path
    make_dirs(path=os.path.dirname(destination_path))
    copy(source_path, destination_path)


def capture_sources(module_path):
    source_path = module_path + '/src'
    destination_path = SONAR_PROJECT + "/" + module_path + '/src'
    os.symlink(os.getcwd() + '/' + source_path, destination_path)


"""
    Writes out the properties for a given module and stages the files needed by the scanner.
"""


def write_module(target, out):
    path, module_name = split_target(target)
    query = 'labels(srcs, "%s-native")' % target

    # get rid of previous data
    try:
        os.remove('/tmp/jacoco.exec')
    except OSError:
        pass

    try:
        # Find all the test targets in this package
        coverage_target_query = "attr(name, .*-coverage, tests(//" + path + ":*))"
        coverage_targets_result = run_command(["bazel", "query", coverage_target_query])

        # Find the test targets that are coverage targets
        run_coverage_command = ['bazel', 'test']
        for coverage_target in coverage_targets_result:
            run_coverage_command.append(str(coverage_target))
    except CalledProcessError:
        print "Error querying test files for target " + target
        return

    try:
        # Use bazel to run all the coverage targets
        run_coverage_command.append('--cache_test_results=no')
        run_command(run_coverage_command)

        # Find the source files used by the tests
        sources = run_command(['bazel', 'query', query])
    except CalledProcessError as exc:
        print "Error running test files for target " + target
        raise exc

    if not os.path.exists('/tmp/jacoco.exec'):
        # No coverage data was produced, not much to do
        return

    # Filter out non-Java files
    sources = \
        [source_file for source_file in sources if "package-info" not in source_file and ".java" in source_file]

    # Adjust source file paths to be relative to the root
    sources_filtered = []
    for source in sources:
        sources_filtered.append(source.replace('//' + path + ':', "", 1))

    # create a CSL of all the source files for use in the properties file
    sources_csl = ",".join(sources_filtered).replace("//", "").replace(":", "/")

    # Write out the properties for this package
    out.write('%s.sonar.projectBaseDir=%s\n' % (module_name, path))
    out.write('%(name)s.sonar.projectName=%(name)s\n' % {'name': module_name})
    out.write('%s.sonar.sources=%s\n' % (module_name, sources_csl))
    binaries = find_bazel_classes_directory(module_name, path)
    out.write('%s.sonar.java.binaries = %s\n' % (module_name, binaries))

    # Get the dependencies for this package using bazel
    deps_files = run_command_with_stderr(['bazel', 'build', '%s-tests-gen-deps' % target])

    dep_file = ""
    for source_file in deps_files:
        if source_file.endswith(".txt"):
            dep_file = source_file.strip()

    libraries = []
    with open(dep_file, 'r') as read_files:
        lines = read_files.readline().split(',')

        external_base_path = os.path.realpath(
            os.path.realpath("bazel-" + find_bazel_project() + "/external") + "/../../..")
        for line in lines:
            library_file_name = line
            if line.startswith("external"):
                library_file_name = external_base_path + "/" + library_file_name
            else:
                library_file_name = os.getcwd() + "/" + library_file_name
            libraries.append(library_file_name)

    out.write('%s.sonar.java.libraries = %s\n' % (module_name, ",".join(libraries)))

    # Capture files needed by the scanner into the staging area
    capture_surefire_reports(path)
    capture_jacoco(path)
    capture_sources(path)


def _main():
    global ONOS_ROOT, targets
    debug = False
    if len(sys.argv) > 1:
        debug = True

    # Change to $ONOS_ROOT
    ONOS_ROOT = os.environ['ONOS_ROOT']
    if ONOS_ROOT:
        os.chdir(ONOS_ROOT)

    # build ONOS
    run_command(["bazel", "build", "onos"])

    # find the test targets to get coverage for
    if debug:
        # Use a predefined list of targets for debugging
        targets = ['//core/net:onos-core-net', '//utils/misc:onlab-misc']
    else:
        # Query all onos OSGi jar file rules with tests from bazel
        targets = run_command(["bazel", "query", "attr('name', '.*-tests-gen', '//...')"])
        targets = [target.replace("-tests-gen-deps", "") for target in targets]

    # Filter out targets without any tests in them
    targets_with_tests = []
    for target in targets:
        colon = target.find(':')
        base_target = target[0:colon]
        target_query_result = run_command(['bazel', 'query', 'tests(' + base_target + ':*)'])
        for result_line in target_query_result:
            if "src/test" in result_line:
                targets_with_tests.append(target)
                break
    targets = targets_with_tests

    # Clear out any old results
    rmtree(SONAR_PROJECT, True)

    # make a directory for the new results
    make_dirs(SONAR_PROJECT)

    # fill in the template for the sonar properties
    sonar_parameters = {
        'name': 'onos',
        'key': 'org.onosproject:onos',
        'version': ONOS_VERSION,
        'jacoco': '/tmp/jacoco.exec',
        'reports': 'surefire-reports',
        'modules': ','.join([split_target(t)[1] for t in targets])
    }
    if debug:
        sonar_parameters["key"] = 'org.onosproject:onos-test-sonar'
        sonar_parameters["name"] = 'onos-test-sonar'

    # Write the sonar properties file
    with open(SONAR_PROPERTIES_FILE_NAME, 'w') as out:
        out.write(ROOT_TEMPLATE % sonar_parameters)
        for target in targets:
            print "Processing coverage for target " + target
            write_module(target, out)


if __name__ == "__main__":
    _main()