#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright 2019 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Tests for heat_map.py."""


import os
import unittest
import unittest.mock as mock

from cros_utils import command_executer
from heatmaps import heat_map
from heatmaps import heatmap_generator


def make_heatmap(
    chromeos_root="/path/to/fake/chromeos_root/",
    perf_data="/any_path/perf.data",
):
    return heat_map.HeatMapProducer(chromeos_root, perf_data, None, None, "")


def fake_mkdtemp(prefix):
    """Mock tempfile.mkdtemp() by just create a pathname."""
    return prefix + "random_dir"


def fake_parser_error(_, msg):
    """Redirect parser.error() to exception."""
    raise Exception(msg)


def fake_generate_perf_report_exception(_):
    raise Exception


class HeatmapTest(unittest.TestCase):
    """All of our tests for heat_map."""

    # pylint: disable=protected-access
    @mock.patch("shutil.copy2")
    @mock.patch("tempfile.mkdtemp")
    def test_EnsureFileInChrootAlreadyInside(self, mock_mkdtemp, mock_copy):
        perf_data_inchroot = (
            "/path/to/fake/chromeos_root/chroot/inchroot_path/perf.data"
        )
        heatmap = make_heatmap(perf_data=perf_data_inchroot)
        heatmap._EnsureFileInChroot()
        self.assertFalse(heatmap.temp_dir_created)
        self.assertEqual(
            heatmap.temp_dir,
            "/path/to/fake/chromeos_root/chroot/inchroot_path/",
        )
        self.assertEqual(heatmap.temp_perf_inchroot, "/inchroot_path/")
        mock_mkdtemp.assert_not_called()
        mock_copy.assert_not_called()

    @mock.patch("shutil.copy2")
    @mock.patch("tempfile.mkdtemp", fake_mkdtemp)
    def test_EnsureFileInChrootOutsideNeedCopy(self, mock_copy):
        heatmap = make_heatmap()
        heatmap._EnsureFileInChroot()
        self.assertTrue(heatmap.temp_dir_created)
        self.assertEqual(mock_copy.call_count, 1)
        self.assertEqual(
            heatmap.temp_dir, "/path/to/fake/chromeos_root/src/random_dir"
        )
        self.assertEqual(heatmap.temp_perf_inchroot, "~/trunk/src/random_dir")

    @mock.patch.object(command_executer.CommandExecuter, "ChrootRunCommand")
    def test_GeneratePerfReport(self, mock_ChrootRunCommand):
        heatmap = make_heatmap()
        heatmap.temp_dir = "/fake/chroot/inchroot_path/"
        heatmap.temp_perf_inchroot = "/inchroot_path/"
        mock_ChrootRunCommand.return_value = 0
        heatmap._GeneratePerfReport()
        cmd = (
            "cd %s && perf report -D -i perf.data > perf_report.txt"
            % heatmap.temp_perf_inchroot
        )
        mock_ChrootRunCommand.assert_called_with(heatmap.chromeos_root, cmd)
        self.assertEqual(mock_ChrootRunCommand.call_count, 1)
        self.assertEqual(
            heatmap.perf_report, "/fake/chroot/inchroot_path/perf_report.txt"
        )

    @mock.patch.object(heatmap_generator, "HeatmapGenerator")
    def test_GetHeatMap(self, mock_heatmap_generator):
        heatmap = make_heatmap()
        heatmap._GetHeatMap(10)
        self.assertTrue(mock_heatmap_generator.called)

    @mock.patch.object(heat_map.HeatMapProducer, "_EnsureFileInChroot")
    @mock.patch.object(heat_map.HeatMapProducer, "_GeneratePerfReport")
    @mock.patch.object(heat_map.HeatMapProducer, "_GetHeatMap")
    @mock.patch.object(heat_map.HeatMapProducer, "_RemoveFiles")
    def test_Run(
        self,
        mock_remove_files,
        mock_get_heatmap,
        mock_generate_perf_report,
        mock_ensure_file_in_chroot,
    ):
        heatmap = make_heatmap()
        heatmap.Run(10)
        mock_ensure_file_in_chroot.assert_called_once_with()
        mock_generate_perf_report.assert_called_once_with()
        mock_get_heatmap.assert_called_once_with(10)
        mock_remove_files.assert_called_once_with()

    @mock.patch.object(heat_map.HeatMapProducer, "_EnsureFileInChroot")
    @mock.patch.object(
        heat_map.HeatMapProducer,
        "_GeneratePerfReport",
        new=fake_generate_perf_report_exception,
    )
    @mock.patch.object(heat_map.HeatMapProducer, "_GetHeatMap")
    @mock.patch.object(heat_map.HeatMapProducer, "_RemoveFiles")
    @mock.patch("builtins.print")
    def test_Run_with_exception(
        self,
        mock_print,
        mock_remove_files,
        mock_get_heatmap,
        mock_ensure_file_in_chroot,
    ):
        heatmap = make_heatmap()
        with self.assertRaises(Exception):
            heatmap.Run(10)
        mock_ensure_file_in_chroot.assert_called_once_with()
        mock_get_heatmap.assert_not_called()
        mock_remove_files.assert_called_once_with()
        mock_print.assert_not_called()

    @mock.patch("argparse.ArgumentParser.error", fake_parser_error)
    @mock.patch.object(os.path, "isfile")
    @mock.patch.object(heat_map, "IsARepoRoot")
    def test_main_arg_format(self, mock_IsARepoRoot, mock_isfile):
        """Test wrong arg format are detected."""
        args = [
            "--chromeos_root=/fake/chroot/",
            "--perf_data=/path/to/perf.data",
        ]

        # Test --chromeos_root format
        mock_IsARepoRoot.return_value = False
        with self.assertRaises(Exception) as msg:
            heat_map.main(args)
        self.assertIn("does not contain .repo dir.", str(msg.exception))

        # Test --perf_data format
        mock_IsARepoRoot.return_value = True
        mock_isfile.return_value = False
        with self.assertRaises(Exception) as msg:
            heat_map.main(args)
        self.assertIn("Cannot find perf_data", str(msg.exception))

        # Test --hugepage format
        mock_isfile.return_value = True
        args.append("--hugepage=0")
        with self.assertRaises(Exception) as msg:
            heat_map.main(args)
        self.assertIn("Wrong format of hugepage range", str(msg.exception))

        # Test --hugepage parse
        args[-1] = "--hugepage=0,4096"
        heat_map.HeatMapProducer = mock.MagicMock()
        heat_map.main(args)
        heat_map.HeatMapProducer.assert_called_with(
            "/fake/chroot/", "/path/to/perf.data", [0, 4096], None, ""
        )


if __name__ == "__main__":
    unittest.main()