import hotshot
import hotshot.log
import os
import pprint
import unittest

import test_support

from hotshot.log import ENTER, EXIT, LINE


def shortfilename(fn):
    # We use a really shortened filename since an exact match is made,
    # and the source may be either a Python source file or a
    # pre-compiled bytecode file.
    if fn:
        return os.path.splitext(os.path.basename(fn))[0]
    else:
        return fn


class UnlinkingLogReader(hotshot.log.LogReader):
    """Extend the LogReader so the log file is unlinked when we're
    done with it."""

    def __init__(self, logfn):
        self.__logfn = logfn
        hotshot.log.LogReader.__init__(self, logfn)

    def next(self, index=None):
        try:
            return hotshot.log.LogReader.next(self)
        except (IndexError, StopIteration):
            os.unlink(self.__logfn)
            raise


class HotShotTestCase(unittest.TestCase):
    def new_profiler(self, lineevents=0, linetimings=1):
        self.logfn = test_support.TESTFN
        return hotshot.Profile(self.logfn, lineevents, linetimings)

    def get_logreader(self):
        log = UnlinkingLogReader(self.logfn)
        return log

    def get_events_wotime(self):
        L = []
        for event in self.get_logreader():
            what, (filename, lineno, funcname), tdelta = event
            L.append((what, (shortfilename(filename), lineno, funcname)))
        return L

    def check_events(self, expected):
        events = self.get_events_wotime()
        if not __debug__:
            # Running under -O, so we don't get LINE events
            expected = [ev for ev in expected if ev[0] != LINE]
        if events != expected:
            self.fail(
                "events did not match expectation; got:\n%s\nexpected:\n%s"
                % (pprint.pformat(events), pprint.pformat(expected)))

    def run_test(self, callable, events, profiler=None):
        if profiler is None:
            profiler = self.new_profiler()
        profiler.runcall(callable)
        profiler.close()
        self.check_events(events)

    def test_line_numbers(self):
        def f():
            y = 2
            x = 1
        def g():
            f()
        f_lineno = f.func_code.co_firstlineno
        g_lineno = g.func_code.co_firstlineno
        events = [(ENTER, ("test_hotshot", g_lineno, "g")),
                  (LINE,  ("test_hotshot", g_lineno, "g")),
                  (LINE,  ("test_hotshot", g_lineno+1, "g")),
                  (ENTER, ("test_hotshot", f_lineno, "f")),
                  (LINE,  ("test_hotshot", f_lineno, "f")),
                  (LINE,  ("test_hotshot", f_lineno+1, "f")),
                  (LINE,  ("test_hotshot", f_lineno+2, "f")),
                  (EXIT,  ("test_hotshot", f_lineno, "f")),
                  (EXIT,  ("test_hotshot", g_lineno, "g")),
                  ]
        self.run_test(g, events, self.new_profiler(lineevents=1))


def test_main():
    test_support.run_unittest(HotShotTestCase)


if __name__ == "__main__":
    test_main()