#!/usr/bin/python

import argparse
import datetime
import hashlib                  # md5
import lxml.etree as ET
import os
import re
import shutil
import subprocess
import time
import sgprops
import sys
import catalogTags

CATALOG_VERSION = 4

parser = argparse.ArgumentParser()
parser.add_argument("--update", help="Update/pull SCM source",
                    action="store_true")
parser.add_argument("--no-update",
                    help="Disable updating from SCM source",
                    action="store_true")
parser.add_argument("--clean", help="Force regeneration of all zip files",
                    action="store_true")
parser.add_argument("dir", help="Catalog directory")
args = parser.parse_args()

includes = []

# xml node (robust) get text helper
def get_xml_text(e):
    if e != None and e.text != None:
        return e.text
    else:
        return ''

# create an xml node with text content
def make_xml_leaf(name, text):
    leaf = ET.Element(name)
    if text != None:
        if isinstance(text, (int, long)):
            leaf.text = str(text)
        else:
            leaf.text = text
    else:
        leaf.text = ''
    return leaf

# return all available aircraft information from the set file as a
# dict
def scan_set_file(aircraft_dir, set_file):
    global includes

    base_file = os.path.basename(set_file)
    base_id = base_file[:-8]
    set_path = os.path.join(aircraft_dir, set_file)

    local_includes = includes
    local_includes.append(aircraft_dir)
    root_node = sgprops.readProps(set_path, includePaths = local_includes)

    if not root_node.hasChild("sim"):
        return None

    sim_node = root_node.getChild("sim")
    if sim_node == None:
        return None

    variant = {}
    variant['name'] = sim_node.getValue("description", None)
    variant['status'] = sim_node.getValue("status", None)
    variant['author'] = sim_node.getValue("author", None)
    variant['description'] = sim_node.getValue("long-description", None)
    variant['id'] = base_id

    # allow -set.xml files to declare themselves as primary.
    # we use this avoid needing a variant-of in every other -set.xml
    variant['primary-set'] = sim_node.getValue('primary-set', False)

    # extract and record previews for each variant
    if sim_node.hasChild('previews'):
        print "has previews ..."
        variant['previews'] = extract_previews(sim_node.getChild('previews'), aircraft_dir)

    if sim_node.hasChild('rating'):
        rating_node = sim_node.getChild("rating")
        variant['rating_FDM'] = rating_node.getValue("FDM", 0)
        variant['rating_systems'] = rating_node.getValue("systems", 0)
        variant['rating_cockpit'] = rating_node.getValue("cockpit", 0)
        variant['rating_model'] = rating_node.getValue("model", 0)

    if sim_node.hasChild('tags'):
        variant['tags'] = extract_tags(sim_node.getChild('tags'), set_file)

    variant['variant-of'] = sim_node.getValue("variant-of", None)
    #print '    ', variant
    return variant

def extract_previews(previews_node, aircraft_dir):
    result = []
    for node in previews_node.getChildren("preview"):
        previewType = node.getValue("type", None)
        previewPath = node.getValue("path", None)

        # check path exists in base-name-dir
        fullPath = os.path.join(aircraft_dir, previewPath)
        if not os.path.isfile(fullPath):
            print "Bad preview path, skipping:" + fullPath
            continue
        result.append({'type':previewType, 'path':previewPath})

    return result

def extract_tags(tags_node, set_path):
    result = []
    for node in tags_node.getChildren("tag"):
        tag = node.value
        # check tag is in the allowed list
        if not catalogTags.isValidTag(tag):
            print "Unknown tag value:", tag, " in ", set_path
        result.append(tag)

    return result

# scan all the -set.xml files in an aircraft directory.  Returns a
# package dict and a list of variants.
def scan_aircraft_dir(aircraft_dir):
    # old way of finding the master aircraft: it's the only one whose
    # variant-of is empty. All the others have an actual value
    # newer alternative is to specify one -set.xml as the primary. All the
    # others are therefore variants.
    setDicts = []
    found_master = False
    package = None

    files = os.listdir(aircraft_dir)
    for file in sorted(files, key=lambda s: s.lower()):
        if file.endswith('-set.xml'):
            try:
                d = scan_set_file(aircraft_dir, file)
                if d == None:
                    continue
            except:
                print "Skipping set file since couldn't be parsed:", os.path.join(aircraft_dir, file), sys.exc_info()[0]
                continue

            setDicts.append(d)
            if d['primary-set']:
                found_master = True
                package = d

    # didn't find a dict identified explicitly as the primary, look for one
    # with an undefined variant-of
    if not found_master:
        for d in setDicts:
            if d['variant-of'] == '':
                found_master = True
                package = d
                break

    if not found_master:
        if len(setDicts) > 1:
            print "Warning, no explicit primary set.xml in " + aircraft_dir
        # use the first one
        package = setDicts[0]

    # variants is just all the set dicts except the master
    variants = setDicts
    variants.remove(package)
    return (package, variants)

# use svn commands to report the last change date within dir
def last_change_date_svn(dir):
    command = [ 'svn', 'info', dir ]
    result = subprocess.check_output( command )
    match = re.search('Last Changed Date: (\d+)\-(\d+)\-(\d+)', result)
    if match:
        rev_str = match.group(1) + match.group(2) + match.group(3)
        return int(rev_str)

# find the most recent mtime within a directory subtree
def scan_dir_for_change_date_mtime(path):
    maxsec = 0
    names = os.listdir(path)
    for name in names:
        fullname = os.path.join(path, name)
        if name == '.' or name == '..':
            pass
        elif os.path.isdir( fullname ):
            mtime = scan_dir_for_change_date_mtime( fullname )
            if mtime > maxsec:
                maxsec = mtime
        else:
            mtime = os.path.getmtime( fullname )
            if mtime > maxsec:
                maxsec = mtime
    return maxsec

def make_aircraft_zip(repo_path, name, zip_file):
    print "Updating:", name + '.zip'
    savedir = os.getcwd()
    os.chdir(repo_path)
    if os.path.exists(zip_file):
        os.remove(zip_file)
    command = ['zip', '-rq', '-9']
    if os.path.exists(zip_excludes):
        command += ['-x@' + zip_excludes]
    else:
        print "warning: no zip-excludes.lst file provided", zip_excludes
    command += [zip_file, name]
    subprocess.call(command)
    os.chdir(savedir)

def get_md5sum(file):
    f = open(file, 'r')
    md5sum = hashlib.md5(f.read()).hexdigest()
    f.close()
    return md5sum

def append_preview_nodes(node, variant, download_base, package_name):
    if not 'previews' in variant:
        return

    for preview in variant['previews']:
        preview_node = ET.Element('preview')
        preview_url = download_base + 'previews/' + package_name + '_' + preview['path']
        preview_node.append( make_xml_leaf('type', preview['type']) )
        preview_node.append( make_xml_leaf('url', preview_url) )
        preview_node.append( make_xml_leaf('path', preview['path']) )
        node.append(preview_node)

def copy_previews_for_variant(variant, package_name, package_dir, previews_dir):
    if not 'previews' in variant:
        return

    for preview in variant['previews']:
        preview_src = os.path.join(package_dir, preview['path'])
        preview_dst = os.path.join(previews_dir, package_name + '_' + preview['path'])
        #print preview_src, preview_dst, preview['path']
        dir = os.path.dirname(preview_dst)
        if not os.path.isdir(dir):
            os.makedirs(dir)
        if os.path.exists(preview_src):
            shutil.copy2(preview_src, preview_dst)

def copy_previews_for_package(package, variants, package_name, package_dir, previews_dir):
    copy_previews_for_variant(package, package_name, package_dir, previews_dir)
    for v in variants:
        copy_previews_for_variant(v, package_name, package_dir, previews_dir)

def append_tag_nodes(node, variant):
    if not 'tags' in variant:
        return

    for tag in variant['tags']:
        node.append(make_xml_leaf('tag', tag))

#def get_file_stats(file):
#    f = open(file, 'r')
#    md5 = hashlib.md5(f.read()).hexdigest()
#    file_size = os.path.getsize(file)
#    return (md5, file_size)

if not os.path.isdir(args.dir):
    print "A valid catalog directory must be provided"
    exit(0)

parser = ET.XMLParser(remove_blank_text=True)

config_file = os.path.join(args.dir, 'catalog.config.xml')
config = ET.parse(config_file, parser)
config_node = config.getroot()

template_file = os.path.join(args.dir, 'template.xml')
template = ET.parse(template_file, parser)
template_root = template.getroot()
template_node = template_root.find('template')

md5sum_file = os.path.join(args.dir, 'md5sum.xml')
if os.path.exists(md5sum_file):
    md5sum_tree = ET.parse(md5sum_file, parser)
    md5sum_root = md5sum_tree.getroot()
else:
    md5sum_root = ET.Element('PropertyList')
    md5sum_tree = ET.ElementTree(md5sum_root)

scm_list = config_node.findall('scm')
upload_node = config_node.find('upload')
download_base = get_xml_text(config_node.find('download-url'))
output_dir = get_xml_text(config_node.find('local-output'))
if output_dir == '':
    output_dir = os.path.join(args.dir, 'output')
if not os.path.isdir(output_dir):
    os.mkdir(output_dir)

thumbnail_dir = os.path.join(output_dir, 'thumbnails')
if not os.path.isdir(thumbnail_dir):
    os.mkdir(thumbnail_dir)

previews_dir = os.path.join(output_dir, 'previews')
if not os.path.isdir(previews_dir):
    os.mkdir(previews_dir)

tmp = os.path.join(args.dir, 'zip-excludes.lst')
zip_excludes = os.path.realpath(tmp)

for i in config_node.findall("include-dir"):
    path = get_xml_text(i)
    if not os.path.exists(path):
        print "Skipping missing include path:", path
        continue
    includes.append(path)

# freshen repositories
if args.no_update:
    print 'Skipping repository updates.'
else:
    cwd = os.getcwd()
    for scm in scm_list:
        repo_type = get_xml_text(scm.find('type'))
        repo_path = get_xml_text(scm.find('path'))
        includes.append(repo_path)

        if repo_type == 'svn':
            print 'SVN update:', repo_path
            subprocess.call(['svn', 'update', repo_path])
        elif repo_type == 'git':
            print 'GIT pull:', repo_path
            os.chdir(repo_path)
            subprocess.call(['git','pull'])
        elif repo_type == 'no-scm':
            print "No update of unmannaged files:", repo_path
        else:
            print "Unknown scm type:", scm, repo_path
    os.chdir(cwd)

# names of zip files we want (so we can identify/remove orphans)
valid_zips = []

# create the catalog tree
catalog_node = ET.Element('PropertyList')
catalog_root = ET.ElementTree(catalog_node)

# include the template configuration
for child in template_node:
    catalog_node.append(child)

# scan repositories for catalog information
for scm in scm_list:
    repo_type = get_xml_text(scm.find('type'))
    repo_path = get_xml_text(scm.find('path'))
    skip_nodes = scm.findall('skip')
    skip_list = []
    for s in skip_nodes:
        skip_list.append(get_xml_text(s))
    print 'skip list:', skip_list
    names = os.listdir(repo_path)
    for name in sorted(names, key=lambda s: s.lower()):
        if name in skip_list:
            print "skipping:", name
            continue

        aircraft_dir = os.path.join(repo_path, name)
        if os.path.isdir(aircraft_dir):
            print "%s:" % name,
            (package, variants) = scan_aircraft_dir(aircraft_dir)
            if package == None:
                print "skipping:", name, "(no -set.xml files)"
                continue
            #print "package:", package
            #print "variants:", variants
            package_node = ET.Element('package')
            package_node.append( make_xml_leaf('name', package['name']) )
            package_node.append( make_xml_leaf('status', package['status']) )
            package_node.append( make_xml_leaf('author', package['author']) )
            package_node.append( make_xml_leaf('description', package['description']) )
            if 'rating_FDM' in package or 'rating_systems' in package \
               or 'rating_cockpit' in package or 'rating_model' in package:
                rating_node = ET.Element('rating')
                package_node.append(rating_node)
                rating_node.append( make_xml_leaf('FDM',
                                                  package['rating_FDM']) )
                rating_node.append( make_xml_leaf('systems',
                                                  package['rating_systems']) )
                rating_node.append( make_xml_leaf('cockpit',
                                                  package['rating_cockpit']) )
                rating_node.append( make_xml_leaf('model',
                                                  package['rating_model']) )
            package_node.append( make_xml_leaf('id', package['id']) )
            for variant in variants:
                variant_node = ET.Element('variant')
                package_node.append(variant_node)
                variant_node.append( make_xml_leaf('id', variant['id']) )
                variant_node.append( make_xml_leaf('name', variant['name']) )
                if 'description' in variant:
                    variant_node.append( make_xml_leaf('description', variant['description']) )

                if 'author' in variant:
                    variant_node.append( make_xml_leaf('author', variant['author']) )

                append_preview_nodes(variant_node, variant, download_base, name)
                append_tag_nodes(variant_node, variant)

            package_node.append( make_xml_leaf('dir', name) )
            if not download_base.endswith('/'):
                download_base += '/'
            download_url = download_base + name + '.zip'
            thumbnail_url = download_base + 'thumbnails/' + name + '_thumbnail.jpg'
            package_node.append( make_xml_leaf('url', download_url) )
            package_node.append( make_xml_leaf('thumbnail', thumbnail_url) )

            append_preview_nodes(package_node, package, download_base, name)
            append_tag_nodes(package_node, package)

            # todo: url (download), thumbnail (download url)

            # get cached md5sum if it exists
            md5sum = get_xml_text(md5sum_root.find(str('aircraft_' + name)))

            # now do the packaging and rev number stuff
            dir_mtime = scan_dir_for_change_date_mtime(aircraft_dir)
            if repo_type == 'svn':
                rev = last_change_date_svn(aircraft_dir)
            else:
                d = datetime.datetime.utcfromtimestamp(dir_mtime)
                rev = d.strftime("%Y%m%d")
            package_node.append( make_xml_leaf('revision', rev) )
            #print "rev:", rev
            #print "dir mtime:", dir_mtime
            zipfile = os.path.join( output_dir, name + '.zip' )
            valid_zips.append(name + '.zip')
            if not os.path.exists(zipfile) \
               or dir_mtime > os.path.getmtime(zipfile) \
               or args.clean:
                # rebuild zip file
                print "updating:", zipfile
                make_aircraft_zip(repo_path, name, zipfile)
                md5sum = get_md5sum(zipfile)
            else:
                print "(no change)"
                if md5sum == "":
                    md5sum = get_md5sum(zipfile)
            filesize = os.path.getsize(zipfile)
            package_node.append( make_xml_leaf('md5', md5sum) )
            package_node.append( make_xml_leaf('file-size-bytes', filesize) )

            # handle md5sum cache
            node = md5sum_root.find('aircraft_' + name)
            if node != None:
                node.text = md5sum
            else:
                md5sum_root.append( make_xml_leaf('aircraft_' + name, md5sum) )

            # handle thumbnails
            thumbnail_src = os.path.join(aircraft_dir, 'thumbnail.jpg')
            thumbnail_dst = os.path.join(thumbnail_dir, name + '_thumbnail.jpg')
            if os.path.exists(thumbnail_src):
                shutil.copy2(thumbnail_src, thumbnail_dst)
            catalog_node.append(package_node)
            package_node.append( make_xml_leaf('thumbnail-path', 'thumbnail.jpg') )

            # copy previews for the package and variants into the
            # output directory
            copy_previews_for_package(package, variants, name, aircraft_dir, previews_dir)

# write out the master catalog file
cat_file = os.path.join(output_dir, 'catalog.xml')
catalog_root.write(cat_file, encoding='utf-8', xml_declaration=True, pretty_print=True)

# write out the md5sum cache file
print md5sum_file
md5sum_tree.write(md5sum_file, encoding='utf-8', xml_declaration=True, pretty_print=True)

# look for orphaned zip files
files = os.listdir(output_dir)
for file in files:
    if file.endswith('.zip')and not file in valid_zips:
        print "orphaned zip:", file