# Author: Dmitriy Morozov <hg@foxcub.org>, 2007

"""A very simple and lightweight issue tracker for Mercurial."""

from mercurial import hg, util

from mercurial.i18n import _

import os, time, random, mailbox, glob, socket, ConfigParser

state = {'new': 'new', 'fixed': 'fixed'}

state['default'] = state['new']

issues_dir = ".issues"

filter_prefix = ".filter"

date_format = '%a, %d %b %Y %H:%M:%S'

def ilist(ui, repo, **opts):

    """List issues associated with the project"""

    # Process options

    show_all = opts['all']

    properties = []

    match_date, date_match = False, lambda x: True

    if opts['date']:

        match_date, date_match = True, util.matchdate(opts['date'])

    # Find issues

    issues_path = os.path.join(repo.root, issues_dir)

    if not os.path.exists(issues_path): return

    issues = glob.glob(os.path.join(issues_path, '*'))

    # Process filter

    if opts['filter']:

        filters = glob.glob(os.path.join(issues_path, filter_prefix + '*'))

        config = ConfigParser.SafeConfigParser()

        config.read(filters)

        if not config.has_section(opts['filter']):

            ui.warning('No filter %s defined\n', opts['filter'])

        else:

            properties += config.items(opts['filter'])

    properties += _get_properties(opts['property'])

    for issue in issues:

        mbox = mailbox.mbox(issue)

        property_match = True

        for property,value in properties:

            property_match = property_match and (mbox[0][property] == value)

        if not show_all and (not properties or not property_match) and (properties or mbox[0]['State'].upper() == state['fixed'].upper()): continue

        if match_date and not date_match(util.parsedate(mbox[0]['date'])[0]): continue

def iadd(ui, repo, id = None, comment = 0):

    """Adds a new issue, or comment to an existing issue ID or its comment COMMENT"""

    comment = int(comment)

    # First, make sure issues have a directory

    issues_path = os.path.join(repo.root, issues_dir)

    if not os.path.exists(issues_path): os.mkdir(issues_path)

    if id:

        issue_fn, issue_id = _find_issue(ui, repo, id)

        if not issue_fn:

            ui.warn('No such issue\n')

            return

    user = ui.username()

    default_issue_text  =         "From: %s\nDate: %s\n" % (user, util.datestr(format = date_format))

    if not id:

        default_issue_text +=     "State: %s\n" % state['default']

    default_issue_text +=        "Subject: brief description\n\n"

    default_issue_text +=         "Detailed description."

    issue = ui.edit(default_issue_text, user)

    if issue.strip() == '':

        ui.warn('Empty issue, ignoring\n')

        return

    if issue.strip() == default_issue_text:

        ui.warn('Unchanged issue text, ignoring\n')

        return

    # Create the message

    msg = mailbox.mboxMessage(issue)

    msg.set_from('artemis', True)

    # Pick random filename

    if not id:

        issue_fn = issues_path

        while os.path.exists(issue_fn):

            issue_id = _random_id()

            issue_fn = os.path.join(issues_path, issue_id)

    # else: issue_fn already set

    # Add message to the mailbox

    mbox = mailbox.mbox(issue_fn)

    if id and comment not in mbox:

        ui.warn('No such comment number in mailbox, commenting on the issue itself\n')

    if not id:

        msg.add_header('Message-Id', "<%s-0-artemis@%s>" % (issue_id, socket.gethostname()))

    else:

        msg.add_header('Message-Id', "<%s-%s-artemis@%s>" % (issue_id, _random_id(), socket.gethostname()))

        msg.add_header('References', mbox[(comment < len(mbox) and comment) or 0]['Message-Id'])

        msg.add_header('In-Reply-To', mbox[(comment < len(mbox) and comment) or 0]['Message-Id'])

    mbox.add(msg)

    mbox.close()

    # If adding issue, add the new mailbox to the repository

    if not id:

        repo.add([issue_fn[(len(repo.root)+1):]])            # +1 for the trailing /

        ui.status('Added new issue %s\n' % issue_id)

def ishow(ui, repo, id, comment = 0, **opts):

    """Shows issue ID, or possibly its comment COMMENT"""

    comment = int(comment)

    issue, id = _find_issue(ui, repo, id)

    if not issue: return

    mbox = mailbox.mbox(issue)

    if opts['all']:

        ui.write('='*70 + '\n')

        for i in xrange(len(mbox)):

            _write_message(ui, mbox[i], i)

            ui.write('-'*70 + '\n')

        return

    _show_mbox(ui, mbox, comment)

def iupdate(ui, repo, id, **opts):

    """Update properties of issue ID"""

    issue, id = _find_issue(ui, repo, id)

    if not issue: return

    properties = _get_properties(opts['property'])

    # Read the issue

    mbox = mailbox.mbox(issue)

    msg = mbox[0]

    # Fix the properties

    properties_text = ''

    for property, value in properties:

        msg.replace_header(property, value)

        properties_text += '%s=%s\n' % (property, value)

    mbox[0] = msg

    # Write down a comment about updated properties

    if properties and not opts['no_property_comment']:

        user = ui.username()

        properties_text  =     "From: %s\nDate: %s\nSubject: properties changes (%s)\n\n%s" % \

                            (user, util.datestr(format = date_format),

                             _pretty_list(list(set([property for property, value in properties]))),

                             properties_text)

        msg = mailbox.mboxMessage(properties_text)

        msg.add_header('Message-Id', "<%s-%s-artemis@%s>" % (id, _random_id(), socket.gethostname()))

        msg.add_header('References', mbox[0]['Message-Id'])

        msg.add_header('In-Reply-To', mbox[0]['Message-Id'])

        msg.set_from('artemis', True)

        mbox.add(msg)

    mbox.flush()

    # Show updated message

    _show_mbox(ui, mbox, 0)

def _find_issue(ui, repo, id):

    issues_path = os.path.join(repo.root, issues_dir)

    if not os.path.exists(issues_path): return False

    issues = glob.glob(os.path.join(issues_path, id + '*'))

    if len(issues) == 0:

        return False, 0

    elif len(issues) > 1:

        ui.status("Multiple choices:\n")

        for i in issues: ui.status('  ', i[len(issues_path)+1:], '\n')

        return False, 0

    return issues[0], issues[0][len(issues_path)+1:]

def _get_properties(property_list):

    return [p.split('=') for p in property_list]

def _write_message(ui, message, index = 0):

    if index: ui.write("Comment: %d\n" % index)

    if ui.verbose:

        ui.write(message.as_string().strip() + '\n')

    else:

        if 'From' in message: ui.write('From: %s\n' % message['From'])

        if 'Date' in message: ui.write('Date: %s\n' % message['Date'])

        if 'Subject' in message: ui.write('Subject: %s\n' % message['Subject'])

        if 'State' in message: ui.write('State: %s\n' % message['State'])

        ui.write('\n' + message.get_payload().strip() + '\n')

def _show_mbox(ui, mbox, comment):

    # Output the issue (or comment)

    if comment >= len(mbox):

        comment = 0

        ui.warn('Comment out of range, showing the issue itself\n')

    msg = mbox[comment]

    ui.write('='*70 + '\n')

    if comment:

        ui.write('Subject: %s\n' % mbox[0]['Subject'])

        ui.write('State: %s\n' % mbox[0]['State'])

        ui.write('-'*70 + '\n')

    _write_message(ui, msg, comment)

    ui.write('-'*70 + '\n')

    # Read the mailbox into the messages and children dictionaries

    messages = {}

    children = {}

    for i in xrange(len(mbox)):

        m = mbox[i]

        messages[m['Message-Id']] = (i,m)

        children.setdefault(m['In-Reply-To'], []).append(m['Message-Id'])

    children[None] = []                # Safeguard against infinte loop on empty Message-Id

    # Iterate over children

    id = msg['Message-Id']

    id_stack = (id in children and map(lambda x: (x, 1), reversed(children[id]))) or []

    if not id_stack: return

    ui.write('Comments:\n')

    while id_stack:

        id,offset = id_stack.pop()

        id_stack += (id in children and map(lambda x: (x, offset+1), reversed(children[id]))) or []

        index, msg = messages[id]

        ui.write('  '*offset + ('%d: ' % index) + msg['Subject'] + '\n')

    ui.write('-'*70 + '\n')

def _pretty_list(lst):

    s = ''

    for i in lst:

        s += i + ', '

    return s[:-2]

def _random_id():

    return "%x" % random.randint(2**63, 2**64-1)

cmdtable = {

    'ilist':    (ilist,

                 [('a', 'all', False,

                   'list all issues (by default only those with state new)'),

                  ('p', 'property', [],

                   'list issues with specific field values (e.g., -p state=fixed)'),

                  ('d', 'date', '', 'restrict to issues matching the date (e.g., -d ">12/28/2007)"'),

                  ('f', 'filter', '', 'restrict to pre-defined filter (in %s/%s*)' % (issues_dir, filter_prefix))],

                 _('hg ilist [OPTIONS]')),

    'iadd':       (iadd, 

                 [],

                 _('hg iadd [ID] [COMMENT]')),

    'ishow':      (ishow,

                 [('a', 'all', None, 'list all comments')],

                 _('hg ishow [OPTIONS] ID [COMMENT]')),

    'iupdate':    (iupdate,

                 [('p', 'property', [],

                   'update properties (e.g., -p state=fixed)'),

                  ('n', 'no-property-comment', None,

                   'do not add a comment about changed properties')],

                 _('hg iupdate [OPTIONS] ID'))

}