#! /usr/bin/env python3.3
"""class TempP4BranchMapping."""
import logging

import p4gf_const
from   p4gf_l10n      import _, NTR
import p4gf_util

LOG = logging.getLogger(__name__)


class TempP4BranchMapping:

    """A class that can create or overwrite a Perforce branch spec.

    Generates its own temporary branch name.
    """

    def __init__(self, p4 = None):
        self.name    = p4gf_const.P4GF_BRANCH_TEMP_N.format(p4gf_util.uuid(p4=p4
                                        , namespace="TempP4BranchMapping"))
        self.written = False

    def write_map(self, p4, p4map):
        """Write our spec to Perforce."""
        spec = p4gf_util.first_dict(p4.run('branch', '-o', self.name))
        spec['Options']     = NTR('unlocked') # 'locked' complicates cleanup/delete.
        spec['View']        = p4map.as_array()
        spec['Description'] = _("Temporary mapping created during 'git push'.")
        if LOG.isEnabledFor(logging.DEBUG3):
            LOG.debug3('write_map() name={} view={}'.format(self.name, spec['View']))
        else:
            LOG.debug2('write_map() name={}'.format(self.name))
        p4.save_branch(spec)
        self.written = True

    def delete(self, p4):
        """Remove our branch spec."""
        if not self.written:
            return

        with p4.at_exception_level(p4.RAISE_NONE):
            p4.run('branch', '-d', self.name)