'''
Usage:
    $ python ss13_genchangelog.py [--dry-run] html/changelog.html html/changelogs/

ss13_genchangelog.py - Generate changelog from YAML.

Copyright 2013 Rob "N3X15" Nelson <nexis@7chan.org>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
'''

from __future__ import print_function
import yaml, os, glob, sys, re, time, argparse
from datetime import datetime, date
from time import time

today = date.today()

dateformat = "%Y.%m.%d"

opt = argparse.ArgumentParser()
opt.add_argument('-d', '--dry-run', dest='dryRun', default=False, action='store_true', help='Only parse changelogs and, if needed, the targetFile. (A .dry_changelog.yml will be output for debugging purposes.)')
opt.add_argument('targetFile', help='The HTML changelog we wish to update.')
opt.add_argument('ymlDir', help='The directory of YAML changelogs we will use.')

args = opt.parse_args()

all_changelog_entries = {}

validPrefixes = [
    'bugfix',
    'wip',
    'tweak',
    'soundadd',
    'sounddel',
    'rscdel',
    'rscadd',
    'imageadd',
    'imagedel',
    'spellcheck',
    'experiment',
    'tgs'
]

def dictToTuples(inp):
    return [(k, v) for k, v in inp.items()]

changelog_cache = os.path.join(args.ymlDir, '.all_changelog.yml')

failed_cache_read = True
if os.path.isfile(changelog_cache):
    try:
        with open(changelog_cache) as f:
            (_, all_changelog_entries) = yaml.load_all(f)
            failed_cache_read = False
            
            # Convert old timestamps to newer format.
            new_entries = {}
            for _date in all_changelog_entries.keys():
                ty = type(_date).__name__
                # print(ty)
                if ty in ['str', 'unicode']:
                    temp_data = all_changelog_entries[_date]
                    _date = datetime.strptime(_date, dateformat).date()
                    new_entries[_date] = temp_data
                else:
                    new_entries[_date] = all_changelog_entries[_date]
            all_changelog_entries = new_entries
    except Exception as e:
        print("Failed to read cache:")
        print(e, file=sys.stderr)
        
if args.dryRun: 
    changelog_cache = os.path.join(args.ymlDir, '.dry_changelog.yml')
    
if failed_cache_read and os.path.isfile(args.targetFile):
    from bs4 import BeautifulSoup
    from bs4.element import NavigableString
    print(' Generating cache...')
    with open(args.targetFile, 'r') as f:
        soup = BeautifulSoup(f)
        for e in soup.find_all('div', {'class':'commit'}):
            entry = {}
            date = datetime.strptime(e.h2.string.strip(), dateformat).date()  # key
            for authorT in e.find_all('h3', {'class':'author'}):
                author = authorT.string
                # Strip suffix
                if author.endswith('updated:'):
                    author = author[:-8]
                author = author.strip()
                
                # Find <ul>
                ulT = authorT.next_sibling
                while(ulT.name != 'ul'):
                    ulT = ulT.next_sibling
                changes = []

                for changeT in ulT.children:
                    if changeT.name != 'li': continue
                    val = changeT.decode_contents(formatter="html")
                    newdat = {changeT['class'][0] + '': val + ''}
                    if newdat not in changes:
                        changes += [newdat]
                
                if len(changes) > 0:
                    entry[author] = changes
            if date in all_changelog_entries:
                all_changelog_entries[date].update(entry)
            else:
                all_changelog_entries[date] = entry
        
del_after = []
print('Reading changelogs...')
for fileName in glob.glob(os.path.join(args.ymlDir, "*.yml")):
    name, ext = os.path.splitext(os.path.basename(fileName))
    if name.startswith('.'): continue
    if name == 'example': continue
    fileName = os.path.abspath(fileName)
    print(' Reading {}...'.format(fileName))
    cl = {}
    with open(fileName, 'r') as f:
        cl = yaml.load(f)
        f.close()
    if today not in all_changelog_entries:
        all_changelog_entries[today] = {}
    author_entries = all_changelog_entries[today].get(cl['author'], [])
    if len(cl['changes']):
        new = 0
        for change in cl['changes']:
            if change not in author_entries:
                (change_type, _) = dictToTuples(change)[0]
                if change_type not in validPrefixes:
                    print('  {0}: Invalid prefix {1}'.format(fileName, change_type), file=sys.stderr)
                author_entries += [change]
                new += 1
        all_changelog_entries[today][cl['author']] = author_entries 
        if new > 0:
            print('  Added {0} new changelog entries.'.format(new))
        
    if cl.get('delete-after', False):
        if os.path.isfile(fileName):
            if args.dryRun:
                print('  Would delete {0} (delete-after set)...'.format(fileName))
            else:
                del_after += [fileName]
    
    if args.dryRun: continue
    
    cl['changes'] = []
    with open(fileName, 'w') as f:
        yaml.dump(cl, f, default_flow_style=False) 
        
targetDir = os.path.dirname(args.targetFile)

with open(args.targetFile.replace('.htm', '.dry.htm') if args.dryRun else args.targetFile, 'w') as changelog:
    with open(os.path.join(targetDir, 'templates', 'header.html'), 'r') as h:
        for line in h:
            changelog.write(line)
    
    for _date in reversed(sorted(all_changelog_entries.keys())):
        entry_htm = '\n'
        entry_htm += '\t\t\t<h2 class="date">{date}</h2>\n'.format(date=_date.strftime(dateformat))
        write_entry = False
        for author in sorted(all_changelog_entries[_date].keys()):
            if len(all_changelog_entries[_date]) == 0: continue
            author_htm = '\t\t\t<h3 class="author">{author} updated:</h3>\n'.format(author=author)
            author_htm += '\t\t\t<ul class="changes bgimages16">\n'
            changes_added = []
            for (css_class, change) in (dictToTuples(e)[0] for e in all_changelog_entries[_date][author]):
                if change in changes_added: continue
                write_entry = True
                changes_added += [change] 
                author_htm += '\t\t\t\t<li class="{css_class}">{change}</li>\n'.format(css_class=css_class, change=change.strip())
            author_htm += '\t\t\t</ul>\n'
            if len(changes_added) > 0:
                entry_htm += author_htm
        if write_entry:
            changelog.write(entry_htm)
        
    with open(os.path.join(targetDir, 'templates', 'footer.html'), 'r') as h:
        for line in h:
            changelog.write(line)
            

with open(changelog_cache, 'w') as f:
    cache_head = 'DO NOT EDIT THIS FILE BY HAND!  AUTOMATICALLY GENERATED BY ss13_genchangelog.py.'
    yaml.dump_all([cache_head, all_changelog_entries], f, default_flow_style=False)

if len(del_after):
    print('Cleaning up...')
    for fileName in del_after:
        if os.path.isfile(fileName):
            print(' Deleting {0} (delete-after set)...'.format(fileName))
            os.remove(fileName)