#!/usr/bin/env python

import xml.etree.ElementTree as ET

import argparse

import StringIO

import re

import subprocess

import logging

from os.path import exists as pathexists

from os.path import realpath

from os.path import join as pathjoin

from os import makedirs

from os import symlink

from os import remove as rmfile

from shutil import copyfile

class Artifact(object):

    def __init__(self, a, g, v):

        self.artifact = a

        self.group = g

        self.version = v

    @classmethod

    def fromCoords(k, coords):

        g,a,v = coords.split(":")

        return k(a, g, v)

    @classmethod

    def fromSubtree(k, t, ns):

        a = t.find("./%sartifactId" % ns).text

        g = t.find("./%sgroupId" % ns).text

        v = t.find("./%sversion" % ns).text

        return k(a, g, v)

    def contains(self, substrings):

        for s in substrings:

            if s in self.artifact or s in self.group:

                cn_debug("ignoring %r because it contains %s" % (self, s))

                return True

        if len(substrings) > 0:

            cn_debug("not ignoring %r; looked for %r" % (self, substrings))

        return False

    def __repr__(self):

        return "%s:%s:%s" % (self.group, self.artifact, self.version)

class DummyPOM(object):

    def __init__(self, groupID=None, artifactID=None, version=None):

        self.groupID = groupID

        self.artifactID = artifactID

        self.version = version

        self.deps = []

def interestingDep(dt, namespace):

    if len(dt.findall("./%soptional" % namespace)) != 0:

        cn_debug("ignoring optional dep %r" % Artifact.fromSubtree(dt, namespace))

        return False

    if [e for e in dt.findall("./%sscope" % namespace) if e.text == "test"] != []:

        cn_debug("ignoring test dep %r" % Artifact.fromSubtree(dt, namespace))

        return False

    return True

class POM(object):

    def __init__(self, filename, suppliedGroupID=None, suppliedArtifactID=None, ignored_deps=[], override=None, extra_deps=[]):

        self.filename = filename

        self.sGroupID = suppliedGroupID

        self.sArtifactID = suppliedArtifactID

        self.logger = logging.getLogger("com.freevariable.climbing-nemesis")

        self.deps = []

        self.ignored_deps = ignored_deps

        self.extra_deps = extra_deps

        cn_debug("POM:  extra_deps is %r" % extra_deps)

        self._parsePom()

        self.claimedGroup, self.claimedArtifact  = override is not None and override or (self.groupID, self.artifactID)

    def _parsePom(self):

        tree = ET.parse(self.filename)

        project = tree.getroot()

        self.logger.info("parsing POM %s", self.filename)

        self.logger.debug("project tag is '%s'", project.tag)

        tagmatch = re.match("[{](.*)[}].*", project.tag)

        namespace = tagmatch and "{%s}" % tagmatch.groups()[0] or ""

        self.logger.debug("looking for '%s'", ("./%sgroupId" % namespace))

        groupIDtag = project.find("./%sgroupId" % namespace) 

        if groupIDtag is None:

            groupIDtag = project.find("./%sparent/%sgroupId" % (namespace,namespace))

        versiontag = project.find("./%sversion" % namespace)

        if versiontag is None:

            versiontag = project.find("./%sparent/%sversion" % (namespace,namespace))

        self.logger.debug("group ID tag is '%s'", groupIDtag)

        self.groupID = groupIDtag.text

        self.artifactID = project.find("./%sartifactId" % namespace).text

        self.version = versiontag.text

        depTrees = project.findall(".//%sdependencies/%sdependency" % (namespace, namespace))

        alldeps = [Artifact.fromSubtree(depTree, namespace) for depTree in depTrees if interestingDep(depTree, namespace)]

        alldeps = [dep for dep in alldeps if not (dep.group == self.groupID and dep.artifact == self.artifactID)]

        self.deps = [dep for dep in alldeps if not dep.contains(self.ignored_deps)] + [Artifact.fromCoords(xtra) for xtra in self.extra_deps]

        jarmatch = re.match(".*JPP-(.*).pom", self.filename)

        self.jarname = (jarmatch and jarmatch.groups()[0] or None)

def cn_debug(*args):

    logging.getLogger("com.freevariable.climbing-nemesis").debug(*args)

def cn_info(*args):

    logging.getLogger("com.freevariable.climbing-nemesis").info(*args)

def resolveArtifact(group, artifact, pomfile=None, kind="jar", ignored_deps=[], override=None, extra_deps=[]):

    # XXX: some error checking would be the responsible thing to do here

    cn_debug("rA:  extra_deps is %r" % extra_deps)

    if pomfile is None:

        try:

            if getFedoraRelease() > 19:

                [pom] = subprocess.check_output(["xmvn-resolve", "%s:%s:pom:%s" % (group, artifact, kind)]).split()

            else:

                [pom] = subprocess.check_output(["xmvn-resolve", "%s:%s:%s" % (group, artifact, kind)]).split()

            return POM(pom, ignored_deps=ignored_deps, override=override, extra_deps=extra_deps)

        except:

            return DummyPOM(group, artifact)

    else:

        return POM(pomfile, ignored_deps=ignored_deps, override=override, extra_deps=extra_deps)

def resolveArtifacts(identifiers):

    coords = ["%s:%s:jar" % (group, artifact) for (group, artifact) in identifiers]

    poms =  subprocess.check_output(["xmvn-resolve"] + coords).split()

    return [POM(pom) for pom in poms]

def resolveJar(group, artifact):

    [jar] = subprocess.check_output(["xmvn-resolve", "%s:%s:jar:jar" % (group, artifact)]).split()

    return jar

def makeIvyXmlTree(org, module, revision, status="release", meta={}, deps=[]):

    ivy_module = ET.Element("ivy-module", {"version":"1.0", "xmlns:e":"http://ant.apache.org/ivy/extra"})

    info = ET.SubElement(ivy_module, "info", dict({"organisation":org, "module":module, "revision":revision, "status":status}.items() + meta.items()))

    info.text = " " # ensure a close tag

    confs = ET.SubElement(ivy_module, "configurations")

    for conf in ["default", "provided", "test"]:

        ET.SubElement(confs, "conf", {"name":conf})

    pubs = ET.SubElement(ivy_module, "publications")

    ET.SubElement(pubs, "artifact", {"name":module, "type":"jar"})

    if len(deps) > 0:

        deptree = ET.SubElement(ivy_module, "dependencies")

        for dep in deps:

            ET.SubElement(deptree, "dependency", {"org":dep.group, "name":dep.artifact, "rev":dep.version})

    return ET.ElementTree(ivy_module)

def writeIvyXml(org, module, revision, status="release", fileobj=None, meta={}, deps=[]):

    # XXX: handle deps!

    if fileobj is None:

        fileobj = StringIO.StringIO()

    tree = makeIvyXmlTree(org, module, revision, status, meta=meta, deps=deps)

    tree.write(fileobj, xml_declaration=True)

    return fileobj

def ivyXmlAsString(org, module, revision, status, meta={}, deps=[]):

    return writeIvyXml(org, module, revision, status, meta=meta, deps=deps).getvalue()

def placeArtifact(artifact_file, repo_dirname, org, module, revision, status="release", meta={}, deps=[], supplied_ivy_file=None, scala=None, override=None, override_dir_only=False):

    if scala is not None:

        module = module + "_%s" % scala

    jarmodule = module

    if override is not None:

        org, module = override

        if not override_dir_only:

            jarmodule = module

    repo_dir = realpath(repo_dirname)

    artifact_dir = pathjoin(*[repo_dir] + [org] + [module, revision])

    ivyxml_path = pathjoin(artifact_dir, "ivy.xml")

    artifact_repo_path = pathjoin(artifact_dir, "%s-%s.jar" % (jarmodule, revision))

    if not pathexists(artifact_dir):

        makedirs(artifact_dir)

    ivyxml_file = open(ivyxml_path, "w")

    if supplied_ivy_file is None:

        writeIvyXml(org, module, revision, status, ivyxml_file, meta=meta, deps=deps)

    else:

        copyfile(supplied_ivy_file, ivyxml_path)

    if pathexists(artifact_repo_path):

        rmfile(artifact_repo_path)

    symlink(artifact_file, artifact_repo_path)

def getFedoraRelease():

    cmd = "rpm -q --qf %{version} fedora-release"

    return int(subprocess.check_output(cmd.split()))

def main():

    parser = argparse.ArgumentParser(description="Place a locally-installed artifact in a custom local Ivy repository; get metadata from Maven")

    parser.add_argument("group", metavar="GROUP", type=str, help="name of group")

    parser.add_argument("artifact", metavar="ARTIFACT", type=str, help="name of artifact")

    parser.add_argument("repodir", metavar="REPO", type=str, help="location for local repo")

    parser.add_argument("--version", metavar="VERSION", type=str, help="version to advertise this artifact as, overriding Maven metadata")

    parser.add_argument("--meta", metavar="K=V", type=str, help="extra metadata to store in ivy.xml", action='append')

    parser.add_argument("--jarfile", metavar="JAR", type=str, help="local jar file (use instead of POM metadata")

    parser.add_argument("--pomfile", metavar="POM", type=str, help="local pom file (use instead of xmvn-resolved one")

    parser.add_argument("--log", metavar="LEVEL", type=str, help="logging level")

    parser.add_argument("--ivyfile", metavar="IVY", type=str, help="supplied Ivy file (use instead of POM metadata)")

    parser.add_argument("--scala", metavar="VERSION", type=str, help="encode given scala version in artifact name")

    parser.add_argument("--ignore", metavar="STR", type=str, help="ignore dependencies whose artifact or group contains str", action='append')

    parser.add_argument("--override", metavar="ORG:NAME", type=str, help="override organization and/or artifact name")

    parser.add_argument("--override-dir-only", action='store_true', help="override organization and/or artifact name")

    parser.add_argument("--extra-dep", metavar="ORG:NAME:VERSION", action='append', help="add the given dependencya")

    args = parser.parse_args()

    if args.log is not None:

        logging.basicConfig(level=getattr(logging, args.log.upper()))

    override = args.override and args.override.split(":") or None

    cn_debug("cl: args.extra_dep is %r" % args.extra_dep)

    extra_deps = args.extra_dep is not None and args.extra_dep or []

    pom = resolveArtifact(args.group, args.artifact, args.pomfile, "jar", ignored_deps=(args.ignore or []), override=((not args.override_dir_only) and override or None), extra_deps=extra_deps)

    if args.jarfile is None:

        jarfile = resolveJar(pom.groupID or args.group, pom.artifactID or args.artifact)

    else:

        jarfile = args.jarfile

    version = (args.version or pom.version)

    meta = dict([kv.split("=") for kv in (args.meta or [])])

    cn_debug("meta is %r" % meta)

    placeArtifact(jarfile, args.repodir, pom.groupID, pom.artifactID, version, meta=meta, deps=pom.deps, supplied_ivy_file=args.ivyfile, scala=args.scala, override=override, override_dir_only=args.override_dir_only)

if __name__ == "__main__":

    main()