#
# Copyright (C) 2017 Intel Corporation
#
# SPDX-License-Identifier: MIT
#

import os
import time
import glob
import sys
import importlib
import subprocess
import unittest
from random import choice

import oeqa
import oe
import bb.utils
import bb.tinfoil

from oeqa.core.context import OETestContext, OETestContextExecutor
from oeqa.core.exception import OEQAPreRun, OEQATestNotFound

from oeqa.utils.commands import runCmd, get_bb_vars, get_test_layer

OESELFTEST_METADATA=["run_all_tests", "run_tests", "skips", "machine", "select_tags", "exclude_tags"]

def get_oeselftest_metadata(args):
    result = {}
    raw_args = vars(args)
    for metadata in OESELFTEST_METADATA:
        if metadata in raw_args:
            result[metadata] = raw_args[metadata]

    return result

class NonConcurrentTestSuite(unittest.TestSuite):
    def __init__(self, suite, processes, setupfunc, removefunc, bb_vars):
        super().__init__([suite])
        self.processes = processes
        self.suite = suite
        self.setupfunc = setupfunc
        self.removefunc = removefunc
        self.bb_vars = bb_vars

    def run(self, result):
        origenv = os.environ.copy()
        (builddir, newbuilddir) = self.setupfunc("-st", None, self.suite)
        ret = super().run(result)
        # In forks we don't have to restore but in a single process, restore cwd and the env
        os.chdir(builddir)
        for e in origenv:
            os.environ[e] = origenv[e]
        if newbuilddir and ret.wasSuccessful() and self.removefunc:
            self.removefunc(newbuilddir)

def removebuilddir(d):
    delay = 5
    while delay and (os.path.exists(d + "/bitbake.lock") or os.path.exists(d + "/cache/hashserv.db-wal")):
        time.sleep(1)
        delay = delay - 1
    # Deleting these directories takes a lot of time, use autobuilder
    # clobberdir if its available
    clobberdir = os.path.expanduser("~/yocto-autobuilder-helper/janitor/clobberdir")
    if os.path.exists(clobberdir):
        try:
            subprocess.check_call([clobberdir, d])
            return
        except subprocess.CalledProcessError:
            pass
    bb.utils.prunedir(d, ionice=True)

class OESelftestTestContext(OETestContext):
    def __init__(self, td=None, logger=None, machines=None, config_paths=None, newbuilddir=None, keep_builddir=None):
        super(OESelftestTestContext, self).__init__(td, logger)

        self.config_paths = config_paths
        self.newbuilddir = newbuilddir

        if keep_builddir:
            self.removebuilddir = None
        else:
            self.removebuilddir = removebuilddir

    def set_variables(self, vars):
        self.bb_vars = vars

    def setup_builddir(self, suffix, selftestdir, suite):
        sstatedir = self.bb_vars['SSTATE_DIR']

        builddir = os.environ['BUILDDIR']
        if not selftestdir:
            selftestdir = get_test_layer(self.bb_vars['BBLAYERS'])
        if self.newbuilddir:
            newbuilddir = os.path.join(self.newbuilddir, 'build' + suffix)
        else:
            newbuilddir = builddir + suffix
        newselftestdir = newbuilddir + "/meta-selftest"

        if os.path.exists(newbuilddir):
            self.logger.error("Build directory %s already exists, aborting" % newbuilddir)
            sys.exit(1)

        bb.utils.mkdirhier(newbuilddir)
        oe.path.copytree(builddir + "/conf", newbuilddir + "/conf")
        oe.path.copytree(builddir + "/cache", newbuilddir + "/cache")
        oe.path.copytree(selftestdir, newselftestdir)

        # if the last line of local.conf in newbuilddir is not empty and does not end with newline then add one
        localconf_path = newbuilddir + "/conf/local.conf"
        with open(localconf_path, "r+", encoding="utf-8") as f:
            last_line = f.readlines()[-1]
            if last_line and not last_line.endswith("\n"):
                f.write("\n")

        subprocess.check_output("git init && git add * && git commit -a -m 'initial'", cwd=newselftestdir, shell=True)

        # Tried to used bitbake-layers add/remove but it requires recipe parsing and hence is too slow
        subprocess.check_output("sed %s/conf/bblayers.conf -i -e 's#%s#%s#g'" % (newbuilddir, selftestdir, newselftestdir), cwd=newbuilddir, shell=True)

        # Relative paths in BBLAYERS only works when the new build dir share the same ascending node
        if self.newbuilddir:
            bblayers = subprocess.check_output("bitbake-getvar --value BBLAYERS | tail -1", cwd=builddir, shell=True, text=True)
            if '..' in bblayers:
                bblayers_abspath = [os.path.abspath(path) for path in bblayers.split()]
                with open("%s/conf/bblayers.conf" % newbuilddir, "a") as f:
                    newbblayers = "# new bblayers to be used by selftest in the new build dir '%s'\n" % newbuilddir
                    newbblayers += 'unset BBLAYERS\n'
                    newbblayers += 'BBLAYERS = "%s"\n' % ' '.join(bblayers_abspath)
                    f.write(newbblayers)

        # Rewrite builddir paths seen in environment variables
        for e in os.environ:
            # Rewrite paths that absolutely point inside builddir
            # (e.g $builddir/conf/ would be rewritten but not $builddir/../bitbake/)
            if builddir + "/" in os.environ[e] and builddir + "/" in os.path.abspath(os.environ[e]):
                os.environ[e] = os.environ[e].replace(builddir + "/", newbuilddir + "/")
            if os.environ[e].endswith(builddir):
                os.environ[e] = os.environ[e].replace(builddir, newbuilddir)

        # Set SSTATE_DIR to match the parent SSTATE_DIR
        subprocess.check_output("echo 'SSTATE_DIR ?= \"%s\"' >> %s/conf/local.conf" % (sstatedir, newbuilddir), cwd=newbuilddir, shell=True)

        os.chdir(newbuilddir)

        def patch_test(t):
            if not hasattr(t, "tc"):
                return
            cp = t.tc.config_paths
            for p in cp:
                if selftestdir in cp[p] and newselftestdir not in cp[p]:
                    cp[p] = cp[p].replace(selftestdir, newselftestdir)
                if builddir in cp[p] and newbuilddir not in cp[p]:
                    cp[p] = cp[p].replace(builddir, newbuilddir)

        def patch_suite(s):
            for x in s:
                if isinstance(x, unittest.TestSuite):
                    patch_suite(x)
                else:
                    patch_test(x)

        patch_suite(suite)

        return (builddir, newbuilddir)

    def prepareSuite(self, suites, processes):
        if processes:
            from oeqa.core.utils.concurrencytest import ConcurrentTestSuite

            return ConcurrentTestSuite(suites, processes, self.setup_builddir, self.removebuilddir, self.bb_vars)
        else:
            return NonConcurrentTestSuite(suites, processes, self.setup_builddir, self.removebuilddir, self.bb_vars)

    def runTests(self, processes=None, machine=None, skips=[]):
        return super(OESelftestTestContext, self).runTests(processes, skips)

    def listTests(self, display_type, machine=None):
        return super(OESelftestTestContext, self).listTests(display_type)

class OESelftestTestContextExecutor(OETestContextExecutor):
    _context_class = OESelftestTestContext
    _script_executor = 'oe-selftest'

    name = 'oe-selftest'
    help = 'oe-selftest test component'
    description = 'Executes selftest tests'

    def register_commands(self, logger, parser):
        group = parser.add_mutually_exclusive_group(required=True)

        group.add_argument('-a', '--run-all-tests', default=False,
                action="store_true", dest="run_all_tests",
                help='Run all (unhidden) tests')
        group.add_argument('-r', '--run-tests', required=False, action='store',
                nargs='+', dest="run_tests", default=None,
                help='Select what tests to run (modules, classes or test methods). Format should be: <module>.<class>.<test_method>')

        group.add_argument('-m', '--list-modules', required=False,
                action="store_true", default=False,
                help='List all available test modules.')
        group.add_argument('--list-classes', required=False,
                action="store_true", default=False,
                help='List all available test classes.')
        group.add_argument('-l', '--list-tests', required=False,
                action="store_true", default=False,
                help='List all available tests.')

        parser.add_argument('-R', '--skip-tests', required=False, action='store',
                nargs='+', dest="skips", default=None,
                help='Skip the tests specified. Format should be <module>[.<class>[.<test_method>]]')

        def check_parallel_support(parameter):
            if not parameter.isdigit():
                import argparse
                raise argparse.ArgumentTypeError("argument -j/--num-processes: invalid int value: '%s' " % str(parameter))

            processes = int(parameter)
            if processes:
                try:
                    import testtools, subunit
                except ImportError:
                    print("Failed to import testtools or subunit, the testcases will run serially")
                    processes = None
            return processes

        parser.add_argument('-j', '--num-processes', dest='processes', action='store',
                type=check_parallel_support, help="number of processes to execute in parallel with")

        parser.add_argument('-t', '--select-tag', dest="select_tags",
                action='append', default=None,
                help='Filter all (unhidden) tests to any that match any of the specified tag(s).')
        parser.add_argument('-T', '--exclude-tag', dest="exclude_tags",
                action='append', default=None,
                help='Exclude all (unhidden) tests that match any of the specified tag(s). (exclude applies before select)')

        parser.add_argument('-K', '--keep-builddir', action='store_true',
                help='Keep the test build directory even if all tests pass')

        parser.add_argument('-B', '--newbuilddir', help='New build directory to use for tests.')
        parser.add_argument('-v', '--verbose', action='store_true')
        parser.set_defaults(func=self.run)

    def _get_cases_paths(self, bbpath):
        cases_paths = []
        for layer in bbpath:
            cases_dir = os.path.join(layer, 'lib', 'oeqa', 'selftest', 'cases')
            if os.path.isdir(cases_dir):
                cases_paths.append(cases_dir)
        return cases_paths

    def _process_args(self, logger, args):
        args.test_start_time = time.strftime("%Y%m%d%H%M%S")
        args.test_data_file = None
        args.CASES_PATHS = None

        bbvars = get_bb_vars()
        logdir = os.environ.get("BUILDDIR")
        if 'LOG_DIR' in bbvars:
            logdir = bbvars['LOG_DIR']
        bb.utils.mkdirhier(logdir)
        args.output_log = logdir + '/%s-results-%s.log' % (self.name, args.test_start_time)

        super(OESelftestTestContextExecutor, self)._process_args(logger, args)

        if args.list_modules:
            args.list_tests = 'module'
        elif args.list_classes:
            args.list_tests = 'class'
        elif args.list_tests:
            args.list_tests = 'name'

        self.tc_kwargs['init']['td'] = bbvars

        builddir = os.environ.get("BUILDDIR")
        self.tc_kwargs['init']['config_paths'] = {}
        self.tc_kwargs['init']['config_paths']['testlayer_path'] = get_test_layer(bbvars["BBLAYERS"])
        self.tc_kwargs['init']['config_paths']['builddir'] = builddir
        self.tc_kwargs['init']['config_paths']['localconf'] = os.path.join(builddir, "conf/local.conf")
        self.tc_kwargs['init']['config_paths']['bblayers'] = os.path.join(builddir, "conf/bblayers.conf")
        self.tc_kwargs['init']['newbuilddir'] = args.newbuilddir
        self.tc_kwargs['init']['keep_builddir'] = args.keep_builddir

        def tag_filter(tags):
            if args.exclude_tags:
                if any(tag in args.exclude_tags for tag in tags):
                    return True
            if args.select_tags:
                if not tags or not any(tag in args.select_tags for tag in tags):
                    return True
            return False

        if args.select_tags or args.exclude_tags:
            self.tc_kwargs['load']['tags_filter'] = tag_filter

        self.tc_kwargs['run']['skips'] = args.skips
        self.tc_kwargs['run']['processes'] = args.processes

    def _pre_run(self):
        def _check_required_env_variables(vars):
            for var in vars:
                if not os.environ.get(var):
                    self.tc.logger.error("%s is not set. Did you forget to source your build environment setup script?" % var)
                    raise OEQAPreRun

        def _check_presence_meta_selftest():
            builddir = os.environ.get("BUILDDIR")
            if os.getcwd() != builddir:
                self.tc.logger.info("Changing cwd to %s" % builddir)
                os.chdir(builddir)

            if not "meta-selftest" in self.tc.td["BBLAYERS"]:
                self.tc.logger.info("meta-selftest layer not found in BBLAYERS, adding it")
                meta_selftestdir = os.path.join(
                    self.tc.td["BBLAYERS_FETCH_DIR"], 'meta-selftest')
                if os.path.isdir(meta_selftestdir):
                    runCmd("bitbake-layers add-layer %s" % meta_selftestdir)
                    # reload data is needed because a meta-selftest layer was add
                    self.tc.td = get_bb_vars()
                    self.tc.config_paths['testlayer_path'] = get_test_layer(self.tc.td["BBLAYERS"])
                else:
                    self.tc.logger.error("could not locate meta-selftest in:\n%s" % meta_selftestdir)
                    raise OEQAPreRun

        def _add_layer_libs():
            bbpath = self.tc.td['BBPATH'].split(':')
            layer_libdirs = [p for p in (os.path.join(l, 'lib') \
                    for l in bbpath) if os.path.exists(p)]
            if layer_libdirs:
                self.tc.logger.info("Adding layer libraries:")
                for l in layer_libdirs:
                    self.tc.logger.info("\t%s" % l)

                sys.path.extend(layer_libdirs)
                importlib.reload(oeqa.selftest)

        _check_required_env_variables(["BUILDDIR"])
        _check_presence_meta_selftest()

        if "buildhistory.bbclass" in self.tc.td["BBINCLUDED"]:
            self.tc.logger.error("You have buildhistory enabled already and this isn't recommended for selftest, please disable it first.")
            raise OEQAPreRun

        if "rm_work.bbclass" in self.tc.td["BBINCLUDED"]:
            self.tc.logger.error("You have rm_work enabled which isn't recommended while running oe-selftest. Please disable it before continuing.")
            raise OEQAPreRun

        if "PRSERV_HOST" in self.tc.td:
            self.tc.logger.error("Please unset PRSERV_HOST in order to run oe-selftest")
            raise OEQAPreRun

        if "SANITY_TESTED_DISTROS" in self.tc.td:
            self.tc.logger.error("Please unset SANITY_TESTED_DISTROS in order to run oe-selftest")
            raise OEQAPreRun

        _add_layer_libs()

        self.tc.logger.info("Checking base configuration is valid/parsable")

        with bb.tinfoil.Tinfoil(tracking=True) as tinfoil:
            tinfoil.prepare(quiet=2, config_only=True)
            d = tinfoil.config_data
            vars = {}
            vars['SSTATE_DIR'] = str(d.getVar('SSTATE_DIR'))
            vars['BBLAYERS'] = str(d.getVar('BBLAYERS'))
        self.tc.set_variables(vars)

    def get_json_result_dir(self, args):
        json_result_dir = os.path.join(self.tc.td["LOG_DIR"], 'oeqa')
        if "OEQA_JSON_RESULT_DIR" in self.tc.td:
            json_result_dir = self.tc.td["OEQA_JSON_RESULT_DIR"]

        return json_result_dir

    def get_configuration(self, args):
        import platform
        from oeqa.utils.metadata import metadata_from_bb
        metadata = metadata_from_bb()
        oeselftest_metadata = get_oeselftest_metadata(args)
        configuration = {'TEST_TYPE': 'oeselftest',
                        'STARTTIME': args.test_start_time,
                        'MACHINE': self.tc.td["MACHINE"],
                        'HOST_DISTRO': oe.lsb.distro_identifier().replace(' ', '-'),
                        'HOST_NAME': metadata['hostname'],
                        'LAYERS': metadata['layers'],
                        'OESELFTEST_METADATA': oeselftest_metadata}
        return configuration

    def get_result_id(self, configuration):
        return '%s_%s_%s_%s' % (configuration['TEST_TYPE'], configuration['HOST_DISTRO'], configuration['MACHINE'], configuration['STARTTIME'])

    def _internal_run(self, logger, args):
        self.module_paths = self._get_cases_paths(
                self.tc_kwargs['init']['td']['BBPATH'].split(':'))

        self.tc = self._context_class(**self.tc_kwargs['init'])
        try:
            self.tc.loadTests(self.module_paths, **self.tc_kwargs['load'])
        except OEQATestNotFound as ex:
            logger.error(ex)
            sys.exit(1)

        if args.list_tests:
            rc = self.tc.listTests(args.list_tests, **self.tc_kwargs['list'])
        else:
            self._pre_run()
            rc = self.tc.runTests(**self.tc_kwargs['run'])
            configuration = self.get_configuration(args)
            rc.logDetails(self.get_json_result_dir(args),
                          configuration,
                          self.get_result_id(configuration))
            rc.logSummary(self.name)

        return rc

    def run(self, logger, args):
        self._process_args(logger, args)

        rc = None
        try:
             rc = self._internal_run(logger, args)
        finally:
            config_paths = self.tc_kwargs['init']['config_paths']

            output_link = os.path.join(os.path.dirname(args.output_log),
                    "%s-results.log" % self.name)
            if os.path.lexists(output_link):
                os.unlink(output_link)
            os.symlink(args.output_log, output_link)

        return rc

_executor_class = OESelftestTestContextExecutor