#!bin/python
from __future__ import division
from rdflib import URIRef
from twisted.internet import reactor
from twisted.internet.defer import inlineCallbacks, Deferred

import logging
import optparse
import os
import time
import treq
import cyclone.web, cyclone.websocket, cyclone.httpclient
from greplin import scales

from run_local import log
from lib.cycloneerr import PrettyErrorHandler

from light9.namespaces import L9, RDF
from light9 import networking, showconfig
from light9.rdfdb.syncedgraph import SyncedGraph
from light9.paint.capture import writeCaptureDescription
from light9.greplin_cyclone import StatsForCyclone
from light9.effect.settings import DeviceSettings
from light9.effect.sequencer import sendToCollector
from light9.rdfdb.patch import Patch

stats = scales.collection('/webServer', scales.PmfStat('setAttr'))

class Camera(object):
    def __init__(self, imageUrl):
        self.imageUrl = imageUrl
    
    def takePic(self, uri, writePath):
        log.info('takePic %s', uri)
        return treq.get(self.imageUrl).addCallbacks(
            lambda r: self._done(writePath, r), log.error)
        
    @inlineCallbacks
    def _done(self, writePath, response):
        jpg = yield response.content()
        try:
            os.makedirs(os.path.dirname(writePath))
        except OSError:
            pass
        with open(writePath, 'w') as out:
            out.write(jpg)
        log.info('wrote %s', writePath)

def deferSleep(sec):
    d = Deferred()
    reactor.callLater(sec, d.callback, None)
    return d
    
class Capture(object):
    firstMoveTime = 3
    settleTime = .5
    def __init__(self, graph, dev):
        self.graph = graph
        self.dev = dev
        
        def steps(a, b, n):
            return [round(a + (b - a) * i / n, 5) for i in range(n)]

        startTime = time.time()
        self.captureId = 'cap%s' % (int(startTime) - 1495170000)
        self.toGather = []

        row = 0
        for ry in steps(0.82, .92, 6):
            xSteps = steps(.23, .42, 12)
            if row % 2:
                xSteps.reverse()
            row += 1
            for rx in xSteps:
                self.toGather.append(DeviceSettings(graph, [
                    (dev, L9['rx'], rx),
                    (dev, L9['ry'], ry),
                    (dev, L9['color'], '#ffffff'),
                ]))

        self.devTail = dev.rsplit('/')[-1]
        self.session = URIRef('/'.join([showconfig.showUri(),
                                   'capture', self.devTail, self.captureId]))
        self.ctx = URIRef(self.session + '/index')
                
        self.graph.patch(Patch(addQuads=[
            (self.session, RDF.type, L9['CaptureSession'], self.ctx),
        ]))
                
        self.numPics = 0
        self.settingsCache = set()
        self.step().addErrback(log.error)

    def off(self):
        return sendToCollector(client='captureDevice', session='main',
                               settings=DeviceSettings(self.graph, []))
        
    @inlineCallbacks
    def step(self):
        if not self.toGather:
            yield self.off()
            yield deferSleep(1)
            reactor.stop()
            return
        settings = self.toGather.pop()
        
        log.info('[%s left] move to %r', len(self.toGather), settings)
        yield sendToCollector(client='captureDevice', session='main',
                              settings=settings)
        
        yield deferSleep(self.firstMoveTime if self.numPics == 0 else
                         self.settleTime)
        
        picId = 'pic%s' % self.numPics
        path = '/'.join([
            'capture', self.devTail, self.captureId, picId]) + '.jpg'
        uri = URIRef(self.session + '/' + picId)
        
        yield camera.takePic(uri, os.path.join(showconfig.root(), path))
        self.numPics += 1

        writeCaptureDescription(self.graph, self.ctx, self.session, uri,
                                self.dev,
                                path, self.settingsCache, settings)
        
        reactor.callLater(0, self.step)

        

camera = Camera('http://dash:8200/picamserve/pic?res=480&resize=480&rotation=180&iso=800&redgain=1.6&bluegain=2&shutter=60000')

class Attrs(PrettyErrorHandler, cyclone.web.RequestHandler):
    def put(self):
        with stats.setAttr.time():
            client, clientSession, settings, sendTime = parseJsonMessage(self.request.body)
            self.set_status(202)

def launch(graph):

    cap = Capture(graph, dev=L9['device/moving1'])
    reactor.listenTCP(networking.captureDevice.port,
                      cyclone.web.Application(handlers=[
                          (r'/()', cyclone.web.StaticFileHandler,
                           {"path" : "light9/web", "default_filename" : "captureDevice.html"}),
                          (r'/stats', StatsForCyclone),
                      ]),
                      interface='::')
    log.info('serving http on %s', networking.captureDevice.port)
    
def main():
    parser = optparse.OptionParser()
    parser.add_option("-v", "--verbose", action="store_true",
                      help="logging.DEBUG")
    (options, args) = parser.parse_args()
    log.setLevel(logging.DEBUG if options.verbose else logging.INFO)

    graph = SyncedGraph(networking.rdfdb.url, "captureDevice")

    graph.initiallySynced.addCallback(lambda _: launch(graph)).addErrback(log.error)
    reactor.run()

if __name__ == '__main__':
    main()