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"""SCons.Errors

This file contains the exception classes used to handle internal
and user errors in SCons.

"""

__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import shutil
import SCons.Util


class BuildError(Exception):
    """ Errors occurring while building.

    BuildError have the following attributes:
    =========================================

    Information about the cause of the build error:
    -----------------------------------------------

    errstr : a description of the error message

    status : the return code of the action that caused the build error.
    Must be set to a non-zero value even if the build error is not due
    to an action returning a non-zero returned code.

    exitstatus : SCons exit status due to this build error.
    Must be nonzero unless due to an explicit Exit()
    call.  Not always the same as status, since
    actions return a status code that should be
    respected, but SCons typically exits with 2
    irrespective of the return value of the failed
    action.

    filename : The name of the file or directory that caused the
    build error. Set to None if no files are associated with
    this error. This might be different from the target
    being built. For example, failure to create the
    directory in which the target file will appear. It
    can be None if the error is not due to a particular
    filename.

    exc_info : Info about exception that caused the build
    error. Set to (None, None, None) if this build
    error is not due to an exception.


    Information about the cause of the location of the error:
    ---------------------------------------------------------

    node : the error occured while building this target node(s)

    executor : the executor that caused the build to fail (might
               be None if the build failures is not due to the
               executor failing)

    action : the action that caused the build to fail (might be
             None if the build failures is not due to the an
             action failure)

    command : the command line for the action that caused the
              build to fail (might be None if the build failures
              is not due to the an action failure)
    """

    def __init__(self,
                 node=None, errstr="Unknown error", status=2, exitstatus=2,
                 filename=None, executor=None, action=None, command=None,
                 exc_info=(None, None, None)):

        # py3: errstr should be string and not bytes.

        self.errstr = SCons.Util.to_str(errstr)
        self.status = status
        self.exitstatus = exitstatus
        self.filename = filename
        self.exc_info = exc_info

        self.node = node
        self.executor = executor
        self.action = action
        self.command = command

        Exception.__init__(self, node, errstr, status, exitstatus, filename,
                           executor, action, command, exc_info)

    def __str__(self):
        if self.filename:
            return self.filename + ': ' + self.errstr
        else:
            return self.errstr

class InternalError(Exception):
    pass

class UserError(Exception):
    pass

class StopError(Exception):
    pass

class EnvironmentError(Exception):
    pass

class MSVCError(IOError):
    pass

class ExplicitExit(Exception):
    def __init__(self, node=None, status=None, *args):
        self.node = node
        self.status = status
        self.exitstatus = status
        Exception.__init__(self, *args)

def convert_to_BuildError(status, exc_info=None):
    """
    Convert any return code a BuildError Exception.

    :Parameters:
      - `status`: can either be a return code or an Exception.

    The buildError.status we set here will normally be
    used as the exit status of the "scons" process.
    """

    if not exc_info and isinstance(status, Exception):
        exc_info = (status.__class__, status, None)


    if isinstance(status, BuildError):
        buildError = status
        buildError.exitstatus = 2   # always exit with 2 on build errors
    elif isinstance(status, ExplicitExit):
        status = status.status
        errstr = 'Explicit exit, status %s' % status
        buildError = BuildError(
            errstr=errstr,
            status=status,      # might be 0, OK here
            exitstatus=status,      # might be 0, OK here
            exc_info=exc_info)
    elif isinstance(status, (StopError, UserError)):
        buildError = BuildError(
            errstr=str(status),
            status=2,
            exitstatus=2,
            exc_info=exc_info)
    elif isinstance(status, shutil.SameFileError):
        # PY3 has a exception for when copying file to itself
        # It's object provides info differently than below
        try:
            filename = status.filename
        except AttributeError:
            filename = None
        
        buildError = BuildError( 
            errstr=status.args[0],
            status=status.errno,
            exitstatus=2,
            filename=filename,
            exc_info=exc_info)

    elif isinstance(status, (EnvironmentError, OSError, IOError)):
        # If an IOError/OSError happens, raise a BuildError.
        # Report the name of the file or directory that caused the
        # error, which might be different from the target being built
        # (for example, failure to create the directory in which the
        # target file will appear).
        try:
            filename = status.filename
        except AttributeError:
            filename = None

        buildError = BuildError( 
            errstr=status.strerror,
            status=status.errno,
            exitstatus=2,
            filename=filename,
            exc_info=exc_info)
    elif isinstance(status, Exception):
        buildError = BuildError(
            errstr='%s : %s' % (status.__class__.__name__, status),
            status=2,
            exitstatus=2,
            exc_info=exc_info)
    elif SCons.Util.is_String(status):
        buildError = BuildError(
            errstr=status,
            status=2,
            exitstatus=2)
    else:
        buildError = BuildError(
            errstr="Error %s" % status,
            status=status,
            exitstatus=2)
    
    #import sys
    #sys.stderr.write("convert_to_BuildError: status %s => (errstr %s, status %s)\n"%(status,buildError.errstr, buildError.status))
    return buildError

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