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import re
import sys


class CrashLogs(object):
    def __init__(self, filesystem):
        self._filesystem = filesystem

    def find_newest_log(self, process_name):
        if sys.platform == "darwin":
            return self._find_newest_log_darwin(process_name)

    def _log_directory_darwin(self):
        log_directory = self._filesystem.expanduser("~")
        log_directory = self._filesystem.join(log_directory, "Library", "Logs")
        if self._filesystem.exists(self._filesystem.join(log_directory, "DiagnosticReports")):
            log_directory = self._filesystem.join(log_directory, "DiagnosticReports")
        else:
            log_directory = self._filesystem.join(log_directory, "CrashReporter")
        return log_directory

    def _find_newest_log_darwin(self, process_name):
        def is_crash_log(fs, dirpath, basename):
            return basename.startswith(process_name + "_") and basename.endswith(".crash")

        log_directory = self._log_directory_darwin()
        logs = self._filesystem.files_under(log_directory, file_filter=is_crash_log)
        if not logs:
            return None
        return self._filesystem.read_text_file(sorted(logs)[-1])
