import gear
import sys
import json
import distbuild


# Artifact build states. These are used to loosely track the state of the
# remote cache.
UNBUILT = 'not-built'
BUILDING = 'building'
BUILT = 'built'

import logging
logging.basicConfig()

gear.Server()

class theController():
    def __init__(self):
        self.graph_client = BuildGraphClient(self)
        self.artifact = None

    def _process_build_graph(self, packet):
        print "Decoding artifact received"
        self.artifact = distbuild.decode_artifact_reference(job.data[-1])
        print "Decoding artifact received done"
        # Mark everything as unbuilt to begin with. We'll query the actua
        # state from the cache in self._query_cache_state().
        def set_initial_state(artifact):
            artifact.state = UNBUILT
        print "Setting them as unbuilt"
        self._map_build_graph(self.artifact, set_initial_state)
        print "Setting them as unbuilt done"

    def _map_build_graph(self, artifact, callback, components=[]):
        """Run callback on each artifact in the build graph and return result.

        If components is given, then only look at the components given and
        their dependencies. Also, return a list of the components after they
        have had callback called on them.

        """
        result = []
        mapped_components = []
        done = set()
        if components:
            queue = list(components)
        else:
            queue = [artifact]
        while queue:
            a = queue.pop()
            if a not in done:
                result.append(callback(a))
                queue.extend(a.dependencies)
                done.add(a)
                if a in components:
                    mapped_components.append(a)
        return result, mapped_components

    def find_artifacts_that_are_ready_to_build(self, root_artifact, components=[]):
        '''Return unbuilt artifacts whose dependencies are all built.

        The 'root_artifact' parameter is expected to be a tree of ArtifactReference
        objects. These must have the 'state' attribute set to BUILT or UNBUILT. If
        'components' is passed, then only those artifacts and their dependencies
        will be built.

        '''
        def is_ready_to_build(artifact):
            return (artifact.state == UNBUILT and
                    all(a.state == BUILT
                        for a in artifact.dependencies))

        artifacts, _ = self._map_build_graph(root_artifact, lambda a: a,
                                       components)
        return [a for a in artifacts if is_ready_to_build(a)]



class BuildGraphClient(gear.Client):
    def __init__(self, controller):
        super(BuildGraphClient, self).__init__()
        self.controller = controller
        self.finished = False

    def handleWorkComplete(self, packet):
        job = super(BuildGraphClient, self).handleWorkComplete(packet)
        print "workcomplete"
        self.controller._process_build_graph(packet)
        return job

    def handleWorkData(self, packet):
        job = super(BuildGraphClient, self).handleWorkData(packet)
        print job.data[-1]
        job.data = []
        return job

    def handleWorkFail(self, packet):
        job = super(BuildGraphClient, self).handleWorkFail(packet)
        print "workfail"
        return job

    def handleWorkException(self, packet):
        job = super(BuildGraphClient, self).handleWorkException(packet)
        print "workexception"
        return job

    def handleDisconnect(self, job):
        job = super(BuildGraphClient, self).handleDisconnect(job)
        print "disconnect"





controller = theController()
client = controller.graph_client
client.addServer('localhost')
client.waitForServer()  # Wait for at least one server to be connected
print "server connected"
#job = gear.Job("reverse", "test string")
build_graph_request = {}
build_graph_request['repo'] = "baserock:baserock/definitions"
build_graph_request['ref'] = "master"
build_graph_request['system'] = "systems/minimal-system-x86_64-generic.morph"

s=json.dumps(build_graph_request)

print "Json produced: "
print s

job = gear.Job("build-graph", s)
client.submitJob(job)

# loop so that client doesn't die
while True:
    import time
    time.sleep(2)
    if controller.artifact != None:
        to_build = controller.find_artifacts_that_are_ready_to_build(controller.artifact)
        print to_build
        exit(0)