"""Tests for coverage.data"""

import os, sys

from coverage.backward import pickle
from coverage.data import CoverageData

sys.path.insert(0, os.path.split(__file__)[0]) # Force relative import for Py3k
from coveragetest import CoverageTest


DATA_1 = { 'a.py': {1:None, 2:None}, 'b.py': {3:None} }
SUMMARY_1 = { 'a.py':2, 'b.py':1 }
MEASURED_FILES_1 = [ 'a.py', 'b.py' ]
A_PY_LINES_1 = [1,2]
B_PY_LINES_1 = [3]

DATA_2 = { 'a.py': {1:None, 5:None}, 'c.py': {17:None} }
SUMMARY_1_2 = { 'a.py':3, 'b.py':1, 'c.py':1 }
MEASURED_FILES_1_2 = [ 'a.py', 'b.py', 'c.py' ]

ARC_DATA_3 = { 'x.py': {(1,2):None, (2,3):None}, 'y.py': {(17,23):None} }
X_PY_ARCS_3 = [(1,2), (2,3)]
Y_PY_ARCS_3 = [(17,23)]

class DataTest(CoverageTest):
    """Test cases for coverage.data."""

    def assert_summary(self, covdata, summary):
        """Check that the summary of `covdata` is `summary`."""
        self.assertEqual(covdata.summary(), summary)

    def assert_measured_files(self, covdata, measured):
        """Check that `covdata`'s measured files are `measured`."""
        self.assertSameElements(covdata.measured_files(), measured)

    def test_reading_empty(self):
        covdata = CoverageData()
        covdata.read()
        self.assert_summary(covdata, {})

    def test_adding_data(self):
        covdata = CoverageData()
        covdata.add_line_data(DATA_1)
        self.assert_summary(covdata, SUMMARY_1)
        self.assert_measured_files(covdata, MEASURED_FILES_1)

    def test_touch_file(self):
        covdata = CoverageData()
        covdata.add_line_data(DATA_1)
        covdata.touch_file('x.py')
        self.assert_measured_files(covdata, MEASURED_FILES_1 + ['x.py'])

    def test_writing_and_reading(self):
        covdata1 = CoverageData()
        covdata1.add_line_data(DATA_1)
        covdata1.write()

        covdata2 = CoverageData()
        covdata2.read()
        self.assert_summary(covdata2, SUMMARY_1)

    def test_combining(self):
        covdata1 = CoverageData()
        covdata1.add_line_data(DATA_1)
        covdata1.write(suffix='1')

        covdata2 = CoverageData()
        covdata2.add_line_data(DATA_2)
        covdata2.write(suffix='2')

        covdata3 = CoverageData()
        covdata3.combine_parallel_data()
        self.assert_summary(covdata3, SUMMARY_1_2)
        self.assert_measured_files(covdata3, MEASURED_FILES_1_2)

    def test_erasing(self):
        covdata1 = CoverageData()
        covdata1.add_line_data(DATA_1)
        covdata1.write()
        covdata1.erase()
        self.assert_summary(covdata1, {})

        covdata2 = CoverageData()
        covdata2.read()
        self.assert_summary(covdata2, {})

    def test_file_format(self):
        # Write with CoverageData, then read the pickle explicitly.
        covdata = CoverageData()
        covdata.add_line_data(DATA_1)
        covdata.write()

        fdata = open(".coverage", 'rb')
        try:
            data = pickle.load(fdata)
        finally:
            fdata.close()

        lines = data['lines']
        self.assertSameElements(lines.keys(), MEASURED_FILES_1)
        self.assertSameElements(lines['a.py'], A_PY_LINES_1)
        self.assertSameElements(lines['b.py'], B_PY_LINES_1)
        # If not measuring branches, there's no arcs entry.
        self.assertEqual(data.get('arcs', 'not there'), 'not there')

    def test_file_format_with_arcs(self):
        # Write with CoverageData, then read the pickle explicitly.
        covdata = CoverageData()
        covdata.add_arc_data(ARC_DATA_3)
        covdata.write()

        fdata = open(".coverage", 'rb')
        try:
            data = pickle.load(fdata)
        finally:
            fdata.close()

        self.assertSameElements(data['lines'].keys(), [])
        arcs = data['arcs']
        self.assertSameElements(arcs['x.py'], X_PY_ARCS_3)
        self.assertSameElements(arcs['y.py'], Y_PY_ARCS_3)