#!/usr/bin/env python
# Copyright (C) 2012 The CyanogenMod Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
import sys
import urllib2
import json
import re
import netrc, base64
from xml.etree import ElementTree

product = sys.argv[1];

if len(sys.argv) > 2:
    depsonly = sys.argv[2]
else:
    depsonly = None

try:
    device = product[product.index("_") + 1:]
except:
    device = product

if not depsonly:
    print "Device %s not found. Attempting to retrieve device repository from CyanogenMod Github (http://github.com/CyanogenMod)." % device

repositories = []

try:
    authtuple = netrc.netrc().authenticators("api.github.com")

    if authtuple:
        githubauth = base64.encodestring('%s:%s' % (authtuple[0], authtuple[2])).replace('\n', '')
    else:
        githubauth = None
except:
    githubauth = None

def add_auth(githubreq):
    if githubauth:
        githubreq.add_header("Authorization","Basic %s" % githubauth)

page = 1
while not depsonly:
    githubreq = urllib2.Request("https://api.github.com/users/CyanogenMod/repos?per_page=100&page=%d" % page)
    add_auth(githubreq)
    result = json.loads(urllib2.urlopen(githubreq).read())
    if len(result) == 0:
        break
    for res in result:
        repositories.append(res)
    page = page + 1

def exists_in_tree(lm, repository):
    for child in lm.getchildren():
        if child.attrib['name'].endswith(repository):
            return True
    return False

# in-place prettyprint formatter
def indent(elem, level=0):
    i = "\n" + level*"  "
    if len(elem):
        if not elem.text or not elem.text.strip():
            elem.text = i + "  "
        if not elem.tail or not elem.tail.strip():
            elem.tail = i
        for elem in elem:
            indent(elem, level+1)
        if not elem.tail or not elem.tail.strip():
            elem.tail = i
    else:
        if level and (not elem.tail or not elem.tail.strip()):
            elem.tail = i

def get_default_revision():
    m = ElementTree.parse(".repo/manifests/default.xml")
    d = m.findall('default')[0]
    r = d.get('revision')
    return r.split('/')[-1]

def get_from_manifest(devicename):
    try:
        lm = ElementTree.parse(".repo/local_manifest.xml")
        lm = lm.getroot()
    except:
        lm = ElementTree.Element("manifest")

    for localpath in lm.findall("project"):
        if re.search("android_device_.*_%s$" % device, localpath.get("name")):
            return localpath.get("path")

    # Devices originally from AOSP are in the main manifest...
    try:
        mm = ElementTree.parse(".repo/manifest.xml")
        mm = mm.getroot()
    except:
        mm = ElementTree.Element("manifest")

    for localpath in mm.findall("project"):
        if re.search("android_device_.*_%s$" % device, localpath.get("name")):
            return localpath.get("path")

    return None

def is_in_manifest(projectname):
    try:
        lm = ElementTree.parse(".repo/local_manifest.xml")
        lm = lm.getroot()
    except:
        lm = ElementTree.Element("manifest")

    for localpath in lm.findall("project"):
        if localpath.get("name") == projectname:
            return 1

    return None

def add_to_manifest(repositories, fallback_branch = None):
    try:
        lm = ElementTree.parse(".repo/local_manifest.xml")
        lm = lm.getroot()
    except:
        lm = ElementTree.Element("manifest")

    for repository in repositories:
        repo_name = repository['repository']
        repo_target = repository['target_path']
        if exists_in_tree(lm, repo_name):
            print 'CyanogenMod/%s already exists' % (repo_name)
            continue

        print 'Adding dependency: CyanogenMod/%s -> %s' % (repo_name, repo_target)
        project = ElementTree.Element("project", attrib = { "path": repo_target,
            "remote": "github", "name": "CyanogenMod/%s" % repo_name })

        if 'branch' in repository:
            project.set('revision',repository['branch'])
        elif fallback_branch:
            print "Using fallback branch %s for %s" % (fallback_branch, repo_name)
            project.set('revision', fallback_branch)
        else:
            print "Using default branch for %s" % repo_name

        lm.append(project)

    indent(lm, 0)
    raw_xml = ElementTree.tostring(lm)
    raw_xml = '<?xml version="1.0" encoding="UTF-8"?>\n' + raw_xml

    f = open('.repo/local_manifest.xml', 'w')
    f.write(raw_xml)
    f.close()

def fetch_dependencies(repo_path, fallback_branch = None):
    print 'Looking for dependencies'
    dependencies_path = repo_path + '/cm.dependencies'
    syncable_repos = []

    if os.path.exists(dependencies_path):
        dependencies_file = open(dependencies_path, 'r')
        dependencies = json.loads(dependencies_file.read())
        fetch_list = []

        for dependency in dependencies:
            if not is_in_manifest("CyanogenMod/%s" % dependency['repository']):
                fetch_list.append(dependency)
                syncable_repos.append(dependency['target_path'])

        dependencies_file.close()

        if len(fetch_list) > 0:
            print 'Adding dependencies to manifest'
            add_to_manifest(fetch_list, fallback_branch)
    else:
        print 'Dependencies file not found, bailing out.'

    if len(syncable_repos) > 0:
        print 'Syncing dependencies'
        os.system('repo sync %s' % ' '.join(syncable_repos))

def has_branch(branches, revision):
    return revision in [branch['name'] for branch in branches]

if depsonly:
    repo_path = get_from_manifest(device)
    if repo_path:
        fetch_dependencies(repo_path)
    else:
        print "Trying dependencies-only mode on a non-existing device tree?"

    sys.exit()

else:
    for repository in repositories:
        repo_name = repository['name']
        if repo_name.startswith("android_device_") and repo_name.endswith("_" + device):
            print "Found repository: %s" % repository['name']
            
            manufacturer = repo_name.replace("android_device_", "").replace("_" + device, "")
            
            default_revision = get_default_revision()
            print "Default revision: %s" % default_revision
            print "Checking branch info"
            githubreq = urllib2.Request(repository['branches_url'].replace('{/branch}', ''))
            add_auth(githubreq)
            result = json.loads(urllib2.urlopen(githubreq).read())

            ## Try tags, too, since that's what releases use
            if not has_branch(result, default_revision):
                githubreq = urllib2.Request(repository['tags_url'].replace('{/tag}', ''))
                add_auth(githubreq)
                result = json.loads(urllib2.urlopen(githubreq).read())
            
            repo_path = "device/%s/%s" % (manufacturer, device)
            adding = {'repository':repo_name,'target_path':repo_path}
            
            fallback_branch = None
            if not has_branch(result, default_revision):
                if os.getenv('ROOMSERVICE_BRANCHES'):
                    fallbacks = filter(bool, os.getenv('ROOMSERVICE_BRANCHES').split(' '))
                    for fallback in fallbacks:
                        if has_branch(result, fallback):
                            print "Using fallback branch: %s" % fallback
                            fallback_branch = fallback
                            break

                if not fallback_branch:
                    print "Default revision %s not found in %s. Bailing." % (default_revision, repo_name)
                    print "Branches found:"
                    for branch in [branch['name'] for branch in result]:
                        print branch
                    print "Use the ROOMSERVICE_BRANCHES environment variable to specify a list of fallback branches."
                    sys.exit()

            add_to_manifest([adding], fallback_branch)

            print "Syncing repository to retrieve project."
            os.system('repo sync %s' % repo_path)
            print "Repository synced!"

            fetch_dependencies(repo_path, fallback_branch)
            print "Done"
            sys.exit()

print "Repository for %s not found in the CyanogenMod Github repository list. If this is in error, you may need to manually add it to your local_manifest.xml." % device