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# App composites collection implementation
from util import *
from atomutil import *
from sys import debug

# Convert an id to a composite id
def compid(id):
    return ("apps", car(id), "app.composite")

# Put a composite into the composite db
def put(id, comp, user, cache, apps):
    debug('composites.py::put::id', id)
    debug('composites.py::put::comp', comp)

    # Get the requested app
    app = apps.get(id)
    if isNil(app):
        debug('composites.py::put', 'app not found', id)
        return False

    # Check app author
    if author(app) != user.get(()):
        debug('composites.py::put', 'different author', author(app))
        return False

    # Update the composite in the composite db
    compentry = mkentry(title(app), car(id), user.get(()), now(), content(comp))
    debug('composites.py::put::compentry', compentry)
    return cache.put(compid(id), compentry)

# Get a composite from the composite db
def get(id, user, cache, apps):
    debug('composites.py::get::id', id)
    if isNil(id):
        return (("'feed", ("'title", "Composites"), ("'id", "composites")),)

    # Get the requested app
    app = apps.get(id)
    if isNil(app):
        debug('composites.py::get', 'app not found', id)

        # Return a default new composite
        return mkentry(car(id), car(id), user.get(()), now(), ())

    # Get the requested composite
    comp = cache.get(compid(id))
    if isNil(comp):
        debug('composites.py::get', 'composite not found', id)

        # Return a default new composite
        return mkentry(title(app), car(id), author(app), now(), ())

    # Return the composite
    compentry = mkentry(title(app), car(id), author(app), updated(comp), content(comp))
    debug('composites.py::get::compentry', compentry)
    return compentry

# Delete a composite from the composite db
def delete(id, user, cache, apps):
    debug('composites.py::delete::id', id)

    # Get the requested app
    app = apps.get(id)
    if isNil(app):
        debug('composites.py::delete', 'app not found', id)
        return False

    # Check app author
    if author(app) != user.get(()):
        debug('composites.py::delete', 'different author', author(app))
        return False

    # Delete the composite
    return cache.delete(compid(id))