# Copyright (C) 2005 Aaron Bentley and Panometrics, Inc.
# <abentley@panoramicfeedback.com>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
import os
import os.path
import errno
import time
import doctest

from beuuid import uuid_gen
from properties import Property, doc_property, local_property, \
    defaulting_property, checked_property, cached_property, \
    primed_property, change_hook_property, settings_property
import settings_object
import mapfile
import comment
import utility


### Define and describe valid bug categories
# Use a tuple of (category, description) tuples since we don't have
# ordered dicts in Python yet http://www.python.org/dev/peps/pep-0372/

# in order of increasing severity.  (name, description) pairs
severity_def = (
  ("wishlist","A feature that could improve usefulness, but not a bug."),
  ("minor","The standard bug level."),
  ("serious","A bug that requires workarounds."),
  ("critical","A bug that prevents some features from working at all."),
  ("fatal","A bug that makes the package unusable."))

# in order of increasing resolution
# roughly following http://www.bugzilla.org/docs/3.2/en/html/lifecycle.html
active_status_def = (
  ("unconfirmed","A possible bug which lacks independent existance confirmation."),
  ("open","A working bug that has not been assigned to a developer."),
  ("assigned","A working bug that has been assigned to a developer."),
  ("test","The code has been adjusted, but the fix is still being tested."))
inactive_status_def = (
  ("closed", "The bug is no longer relevant."),
  ("fixed", "The bug should no longer occur."),
  ("wontfix","It's not a bug, it's a feature."),
  ("disabled", "?"))


### Convert the description tuples to more useful formats

severity_values = ()
severity_description = {}
severity_index = {}
def load_severities(severity_def):
    global severity_values
    global severity_description
    global severity_index
    severity_values = tuple([val for val,description in severity_def])
    severity_description = dict(severity_def)
    severity_index = {}
    for i,severity in enumerate(severity_values):
        severity_index[severity] = i
load_severities(severity_def)

active_status_values = tuple(val for val,description in active_status_def)
inactive_status_values = tuple(val for val,description in inactive_status_def)
status_values = active_status_values + inactive_status_values
status_description = dict(active_status_def+inactive_status_def)
status_index = {}
for i in range(len(status_values)):
    status_index[status_values[i]] = i


class Bug(settings_object.SavedSettingsObject):
    """
    >>> b = Bug()
    >>> print b.status
    open
    >>> print b.severity
    minor

    There are two formats for time, int and string.  Setting either
    one will adjust the other appropriately.  The string form is the
    one stored in the bug's settings file on disk.
    >>> print type(b.time)
    <type 'int'>
    >>> print type(b.time_string)
    <type 'str'>
    >>> b.time = 0
    >>> print b.time_string
    Thu, 01 Jan 1970 00:00:00 +0000
    >>> b.time_string="Thu, 01 Jan 1970 00:01:00 +0000"
    >>> b.time
    60
    >>> print b.settings["time"]
    Thu, 01 Jan 1970 00:01:00 +0000
    """
    settings_properties = []
    required_saved_properties = []
    _prop_save_settings = settings_object.prop_save_settings
    _prop_load_settings = settings_object.prop_load_settings
    def _versioned_property(settings_properties=settings_properties,
                            required_saved_properties=required_saved_properties,
                            **kwargs):
        if "settings_properties" not in kwargs:
            kwargs["settings_properties"] = settings_properties
        if "required_saved_properties" not in kwargs:
            kwargs["required_saved_properties"]=required_saved_properties
        return settings_object.versioned_property(**kwargs)

    @_versioned_property(name="severity",
                         doc="A measure of the bug's importance",
                         default="minor",
                         check_fn=lambda s: s in severity_values,
                         require_save=True)
    def severity(): return {}

    @_versioned_property(name="status",
                         doc="The bug's current status",
                         default="open",
                         allowed=status_values,
                         require_save=True)
    def status(): return {}
    
    @property
    def active(self):
        return self.status in active_status_values

    @_versioned_property(name="target",
                         doc="The deadline for fixing this bug")
    def target(): return {}

    @_versioned_property(name="creator",
                         doc="The user who entered the bug into the system")
    def creator(): return {}

    @_versioned_property(name="reporter",
                         doc="The user who reported the bug")
    def reporter(): return {}

    @_versioned_property(name="assigned",
                         doc="The developer in charge of the bug")
    def assigned(): return {}

    @_versioned_property(name="time",
                         doc="An RFC 2822 timestamp for bug creation")
    def time_string(): return {}

    def _get_time(self):
        if self.time_string == None or self.time_string == settings_object.EMPTY:
            return None
        return utility.str_to_time(self.time_string)
    def _set_time(self, value):
        self.time_string = utility.time_to_str(value)
    time = property(fget=_get_time,
                    fset=_set_time,
                    doc="An integer version of .time_string")

    @_versioned_property(name="summary",
                         doc="A one-line bug description")
    def summary(): return {}

    def _get_comment_root(self, load_full=False):
        if self.sync_with_disk:
            return comment.loadComments(self, load_full=load_full)
        else:
            return comment.Comment(self, uuid=comment.INVALID_UUID)

    @Property
    @cached_property(generator=_get_comment_root)
    @local_property("comment_root")
    @doc_property(doc="The trunk of the comment tree")
    def comment_root(): return {}

    def _get_rcs(self):
        if hasattr(self.bugdir, "rcs"):
            return self.bugdir.rcs

    @Property
    @cached_property(generator=_get_rcs)
    @local_property("rcs")
    @doc_property(doc="A revision control system instance.")
    def rcs(): return {}

    def __init__(self, bugdir=None, uuid=None, from_disk=False,
                 load_comments=False, summary=None):
        settings_object.SavedSettingsObject.__init__(self)
        self.bugdir = bugdir
        self.uuid = uuid
        if from_disk == True:
            self.sync_with_disk = True
        else:
            self.sync_with_disk = False
            if uuid == None:
                self.uuid = uuid_gen()
            self.time = int(time.time()) # only save to second precision
            if self.rcs != None:
                self.creator = self.rcs.get_user_id()
            self.summary = summary

    def __repr__(self):
        return "Bug(uuid=%r)" % self.uuid

    def _setting_attr_string(self, setting):
        value = getattr(self, setting)
        if value == settings_object.EMPTY:
            return ""
        else:
            return str(value)

    def string(self, shortlist=False, show_comments=False):
        if self.bugdir == None:
            shortname = self.uuid
        else:
            shortname = self.bugdir.bug_shortname(self)
        if shortlist == False:
            if self.time_string == "":
                timestring = self.time_string
            else:
                htime = utility.handy_time(self.time)
                timestring = "%s (%s)" % (htime, self.time_string)
            info = [("ID", self.uuid),
                    ("Short name", shortname),
                    ("Severity", self.severity),
                    ("Status", self.status),
                    ("Assigned", self._setting_attr_string("assigned")),
                    ("Target", self._setting_attr_string("target")),
                    ("Reporter", self._setting_attr_string("reporter")),
                    ("Creator", self._setting_attr_string("creator")),
                    ("Created", timestring)]
            longest_key_len = max([len(k) for k,v in info])
            infolines = ["  %*s : %s\n" %(longest_key_len,k,v) for k,v in info]
            bugout = "".join(infolines) + "%s" % self.summary.rstrip('\n')
        else:
            statuschar = self.status[0]
            severitychar = self.severity[0]
            chars = "%c%c" % (statuschar, severitychar)
            bugout = "%s:%s: %s" % (shortname,chars,self.summary.rstrip('\n'))
        
        if show_comments == True:
            # take advantage of the string_thread(auto_name_map=True)
            # SIDE-EFFECT of sorting by comment time.
            comout = self.comment_root.string_thread(flatten=False,
                                                     auto_name_map=True,
                                                     bug_shortname=shortname)
            output = bugout + '\n' + comout.rstrip('\n')
        else :
            output = bugout
        return output

    def __str__(self):
        return self.string(shortlist=True)

    def __cmp__(self, other):
        return cmp_full(self, other)

    def get_path(self, name=None):
        my_dir = os.path.join(self.bugdir.get_path("bugs"), self.uuid)
        if name is None:
            return my_dir
        assert name in ["values", "comments"]
        return os.path.join(my_dir, name)

    def load_settings(self):
        self.settings = mapfile.map_load(self.rcs, self.get_path("values"))
        self._setup_saved_settings()

    def load_comments(self, load_full=True):
        if load_full == True:
            # Force a complete load of the whole comment tree
            self.comment_root = self._get_comment_root(load_full=True)
        else:
            # Setup for fresh lazy-loading.  Clear _comment_root, so
            # _get_comment_root returns a fresh version.  Turn of
            # syncing temporarily so we don't write our blank comment
            # tree to disk.
            self.sync_with_disk = False
            self.comment_root = None
            self.sync_with_disk = True

    def save_settings(self):
        assert self.summary != None, "Can't save blank bug"
        
        self.rcs.mkdir(self.get_path())
        path = self.get_path("values")
        mapfile.map_save(self.rcs, path, self._get_saved_settings())
        
    def save(self):
        self.save_settings()

        if len(self.comment_root) > 0:
            self.rcs.mkdir(self.get_path("comments"))
            comment.saveComments(self)

    def remove(self):
        self.comment_root.remove()
        path = self.get_path()
        self.rcs.recursive_remove(path)
    
    def comments(self):
        for comment in self.comment_root.traverse():
            yield comment

    def new_comment(self, body=None):
        comm = self.comment_root.new_reply(body=body)
        return comm

    def comment_from_shortname(self, shortname, *args, **kwargs):
        return self.comment_root.comment_from_shortname(shortname,
                                                        *args, **kwargs)

    def comment_from_uuid(self, uuid):
        return self.comment_root.comment_from_uuid(uuid)

    def comment_shortnames(self, shortname=None):
        """
        SIDE-EFFECT : Comment.comment_shortnames will sort the comment
        tree by comment.time
        """
        for id, comment in self.comment_root.comment_shortnames(shortname):
            yield (id, comment)


# The general rule for bug sorting is that "more important" bugs are
# less than "less important" bugs.  This way sorting a list of bugs
# will put the most important bugs first in the list.  When relative
# importance is unclear, the sorting follows some arbitrary convention
# (i.e. dictionary order).

def cmp_severity(bug_1, bug_2):
    """
    Compare the severity levels of two bugs, with more severe bugs
    comparing as less.
    >>> bugA = Bug()
    >>> bugB = Bug()
    >>> bugA.severity = bugB.severity = "wishlist"
    >>> cmp_severity(bugA, bugB) == 0
    True
    >>> bugB.severity = "minor"
    >>> cmp_severity(bugA, bugB) > 0
    True
    >>> bugA.severity = "critical"
    >>> cmp_severity(bugA, bugB) < 0
    True
    """
    if not hasattr(bug_2, "severity") :
        return 1
    return -cmp(severity_index[bug_1.severity], severity_index[bug_2.severity])

def cmp_status(bug_1, bug_2):
    """
    Compare the status levels of two bugs, with more 'open' bugs
    comparing as less.
    >>> bugA = Bug()
    >>> bugB = Bug()
    >>> bugA.status = bugB.status = "open"
    >>> cmp_status(bugA, bugB) == 0
    True
    >>> bugB.status = "closed"
    >>> cmp_status(bugA, bugB) < 0
    True
    >>> bugA.status = "fixed"
    >>> cmp_status(bugA, bugB) > 0
    True
    """
    if not hasattr(bug_2, "status") :
        return 1
    val_2 = status_index[bug_2.status]
    return cmp(status_index[bug_1.status], status_index[bug_2.status])

def cmp_attr(bug_1, bug_2, attr, invert=False):
    """
    Compare a general attribute between two bugs using the conventional
    comparison rule for that attribute type.  If invert == True, sort
    *against* that convention.
    >>> attr="severity"
    >>> bugA = Bug()
    >>> bugB = Bug()
    >>> bugA.severity = "critical"
    >>> bugB.severity = "wishlist"
    >>> cmp_attr(bugA, bugB, attr) < 0
    True
    >>> cmp_attr(bugA, bugB, attr, invert=True) > 0
    True
    >>> bugB.severity = "critical"
    >>> cmp_attr(bugA, bugB, attr) == 0
    True
    """
    if not hasattr(bug_2, attr) :
        return 1
    val_1 = getattr(bug_1, attr)
    val_2 = getattr(bug_2, attr)
    if val_1 == settings_object.EMPTY: val_1 = None
    if val_2 == settings_object.EMPTY: val_2 = None
    
    if invert == True :
        return -cmp(val_1, val_2)
    else :
        return cmp(val_1, val_2)

# alphabetical rankings (a < z)
cmp_creator = lambda bug_1, bug_2 : cmp_attr(bug_1, bug_2, "creator")
cmp_assigned = lambda bug_1, bug_2 : cmp_attr(bug_1, bug_2, "assigned")
# chronological rankings (newer < older)
cmp_time = lambda bug_1, bug_2 : cmp_attr(bug_1, bug_2, "time", invert=True)

def cmp_full(bug_1, bug_2, cmp_list=(cmp_status,cmp_severity,cmp_assigned,
                                     cmp_time,cmp_creator)):
    for comparison in cmp_list :
        val = comparison(bug_1, bug_2)
        if val != 0 :
            return val
    return 0

class InvalidValue(ValueError):
    def __init__(self, name, value):
        msg = "Cannot assign value %s to %s" % (value, name)
        Exception.__init__(self, msg)
        self.name = name
        self.value = value

suite = doctest.DocTestSuite()