import copy
import logging

from .session.org_mode import global_session as session

from . import parsing
from . import knowledge_evaluation
from .modifiable_property import is_modifiable_property


def diff_knowledge(before, after):
    import jsondiff
    return jsondiff.diff(before, after)


class KnowledgeBase(object):
    def __init__(self, knowledge, examples=[], trained=[]):
        self.knowledge = copy.copy(knowledge)
        self.originals = []
        self.examples = copy.copy(examples)
        self.trained = copy.copy(trained)

    def train(self, examples):
        knowledge_before = copy.deepcopy(self.knowledge)
        with session().log('Train'):
            # Parse everything
            for example in examples:
                # If there's parsed data, leverage it ASAP
                if 'parsed' in example:
                    with session().log('parsed information integration'):
                        result = knowledge_evaluation.integrate_information(self.knowledge, {
                            "parsed": example['parsed'],
                        })
                        self.act_upon(result)

                with session().log("language integration"):
                    tokens, decomposition, inferred_tree = parsing.integrate_language(self, example)
                    session().annotate(tokens)

                with session().log("full information integration"):
                    result = knowledge_evaluation.integrate_information(self.knowledge, {
                        "elements": tokens,
                        "decomposition": decomposition,
                        "parsed": inferred_tree,
                    })

                    session().annotate("Result: {}".format(self.get_value(result)))
                    self.act_upon(result)
                    session().annotate("Set: {}".format(self.get_value(result)))
                    self.examples.append((decomposition, inferred_tree))
                    self.originals.append(example['text'])

                # Reduce values
                with session().log("reprocessing"):
                    self.trained = parsing.reprocess_language_knowledge(self, self.examples)

            knowledge_after = copy.deepcopy(self.knowledge)
            knowledge_diff_getter = lambda: diff_knowledge(knowledge_before,
                                                       knowledge_after)

            return knowledge_diff_getter

    def process(self, row):
        row = row.lower()
        knowledge_before = copy.deepcopy(self.knowledge)
        with session().log("Process: {}".format(row)):
            tokens = parsing.to_tokens(row)
            fit = parsing.get_fit(self, tokens)
            if fit is None:
                return None

            tokens, inferred_tree = fit
            result = knowledge_evaluation.integrate_information(self.knowledge,
                                                                {
                                                                    "elements": tokens,
                                                                    "parsed": inferred_tree,
                                                                })
            self.act_upon(result)
            session().annotate("Result: {}".format(result))

            knowledge_after = copy.deepcopy(self.knowledge)
            knowledge_diff_getter = lambda: diff_knowledge(knowledge_before,
                                                           knowledge_after)

            return result, inferred_tree, knowledge_diff_getter

    def get_value(self, result):
        if is_modifiable_property(result):
            return result.getter()
        else:
            return result

    def act_upon(self, result):
        if is_modifiable_property(result):
            result.setter()
        else:
            logging.warning("Cannot act upon: {}".format(result))