#!/usr/bin/env python

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import os
import subprocess
import sys
import json
import urllib2
import git_submodule as GitSubmodule

chromium_version = '33.0.1750.170'
chromium_branch = '1750'

json_url = 'http://omahaproxy.appspot.com/all.json'
git_deps_url = 'http://src.chromium.org/chrome/branches/' + chromium_branch + '/src/.DEPS.git'
base_deps_url = 'http://src.chromium.org/chrome/releases/'

def currentVersion():
    return chromium_version

def currentBranch():
    return chromium_branch

def readReleaseChannels():
    response = urllib2.urlopen(json_url)
    raw_json = response.read().strip()
    data = json.loads(raw_json)
    channels = {}

    for obj in data:
        os = obj['os']
        channels[os] = []
        for ver in obj['versions']:
            channels[os].append({ 'channel': ver['channel'], 'version': ver['version'], 'branch': ver['true_branch'] })
    return channels

def repositoryUrlFix(submodule):
    # The git repository info for webrtc is outdated in the 1750
    # branch's .DEPS.git file, so we have to update the url.
    # We should be able to remove this with a branch post 1750.
    repository_url = submodule.url
    if 'external/webrtc/stable' in repository_url:
        submodule.url = repository_url.replace('external/webrtc/stable', 'external/webrtc/trunk')

def sanityCheckModules(submodules):
    submodule_dict = {}
    sys.stdout.write('\nverifying submodule refs.')
    for submodule in submodules:
        sys.stdout.flush()
        if submodule.path in submodule_dict:
            prev_module = submodule_dict[submodule.path]
            # We might have to create our own DEPS file if different platforms use different branches,
            # but for now it should be safe to select the latest revision from the requirements.
            if submodule.shasum or prev_module.revision >= submodule.revision:
                continue
            if prev_module.ref != submodule.ref:
                # Ignore for Android which might lag behind.
                if submodule.os == 'android':
                    continue
                sys.exit('ERROR: branch mismatch for ' + submodule.path + '(' + prev_module.ref + ' vs ' + submodule.ref + ')')
            print('Duplicate submodule ' + submodule.path + '. Using latest revison ' + str(submodule.revision) + '.')
        if submodule.ref:
            repositoryUrlFix(submodule)
            sys.stdout.write('.')
            result = subprocess.check_output(['git', 'ls-remote', submodule.url, submodule.ref])
            if submodule.ref not in result:
                # We could fall back to the git shasum if the parsed remote ref does not exist in
                # the git repository but that would most certainly be outdated, so bail out here.
                sys.exit('\nERROR: No valid remote found!')
            sys.stdout.flush()
        submodule_dict[submodule.path] = submodule
    print('done.\n')
    return list(submodule_dict.values())

def readSubmodules():
    response = urllib2.urlopen(base_deps_url + chromium_version + '/DEPS')
    svn_deps = response.read().strip()

    response = urllib2.urlopen(git_deps_url)
    git_deps = response.read().strip()

    parser = GitSubmodule.DEPSParser()
    svn_submodules = parser.parse(svn_deps)
    git_submodules = parser.parse(git_deps)

    submodule_dict = {}
    git_dict = {}

    for sub in git_submodules:
        git_dict[sub.path] = sub

    for sub in svn_submodules:
        if 'reference_build' not in sub.path and (sub.revision or sub.shasum) and sub.path in git_dict:
            submodule_dict[sub.path] = sub

    for git in git_submodules:
        if git.path in submodule_dict:
            # We'll use the git repository instead of svn.
            module = submodule_dict[git.path]
            module.url = git.url
            if not module.shasum:
                # We use the git shasum as fallback.
                module.shasum = git.shasum

    return sanityCheckModules(submodule_dict.values())