#!/usr/bin/env python

from ..session.org_mode import global_session as session
import re
import copy

from functools import reduce
from typing import List, Dict
from ..modifiable_property import ModifiableProperty
from .. import parameters
from ..atoms import Atom, a, is_atom
from .. import knowledge_evaluation

def make_template(knowledge_base, tokens, parsed):
    matcher = list(tokens)
    template = list(parsed)
    session().annotate(" -- MK TEMPLATE --")
    session().annotate("MATCHR: {}".format(matcher))
    session().annotate("TEMPLT: {}".format(template))
    for i in range(len(matcher)):
        word = matcher[i]
        if word in template:
            template[template.index(word)] = i
            matcher[i] = {
                'groups': set(knowledge_base.knowledge.get(word, {}).get('groups', set())),
            }
    return tokens, matcher, template


def is_bottom_level(tree):
    for element in tree:
        if isinstance(element, list) or isinstance(element, tuple):
            return False
    return True


def get_lower_levels(parsed):
    lower = []
    def aux(subtree, path):
        nonlocal lower
        deeper = len(path) == 0
        for i, element in enumerate(subtree):
            if isinstance(element, list) or isinstance(element, tuple):
                aux(element, path + (i,))
                deeper = True

        if not deeper:
            lower.append((path, subtree))

    aux(parsed, path=())
    return lower


# TODO: probably optimize this, it creates lots of unnecessary tuples
def replace_position(tree, position, new_element):
    session().annotate("REPLACE POSITIONS:")
    session().annotate("  TREE  : {}".format(tree))
    session().annotate("POSITION: {}".format(position))
    session().annotate("NEW ELEM: {}".format(new_element))
    session().annotate("------------------")

    def aux(current_tree, remaining_route):
        if len(remaining_route) == 0:
            return new_element

        else:
            step = remaining_route[0]
            return (
                tree[:step]
                + (aux(tree[step], remaining_route[1:]),)
                + tree[step + 2:]
            )

    result = aux(tree, position)
    session().annotate("-RESULT: {}".format(result))
    return result


def integrate_language(knowledge_base, example):
    text = example["text"].lower()
    parsed = example["parsed"]

    tokens = example['tokens']
    resolved_parsed = copy.deepcopy(parsed)

    while True:
        session().annotate("P: {}".format(resolved_parsed))
        lower_levels = get_lower_levels(resolved_parsed)
        session().annotate("Lower: {}".format(lower_levels))
        if len(lower_levels) == 0:
            break

        for position, atom in lower_levels:
            with session().log("Atom {}".format(atom)):
                result = None
                similars = get_similar_tree(knowledge_base, atom, tokens)
                for similar in similars:
                    result = build_remix_matrix(knowledge_base, tokens, atom, similar)
                    if result is not None:
                        break
                else:
                    raise Exception('Similar not found')

                remix, (start_bounds, end_bounds) = result

                after_remix = apply_remix(tokens[len(start_bounds):-len(end_bounds)], remix)
                session().annotate("--FIND MIX--")
                session().annotate("-MIX- | {}".format(remix))
                session().annotate("-FRM- | {}".format(tokens))
                session().annotate("-AFT- | {}".format(after_remix))

                session().annotate("--- TEMPLATE ---")

                _, matcher, result = make_template(knowledge_base, after_remix, atom)
                session().annotate("Tx: {}".format(after_remix))
                session().annotate("Mx: {}".format(matcher))
                session().annotate("Rx: {}".format(result))
                session().annotate("Sx: {}".format(start_bounds))
                session().annotate("Ex: {}".format(end_bounds))


                assert(len(after_remix) + len(start_bounds) + len(end_bounds) == len(tokens))
                session().annotate( "  +-> {}".format(after_remix))
                subquery_type = knowledge_evaluation.get_subquery_type(knowledge_base.knowledge, atom)
                session().annotate(r"  \-> <{}>".format(subquery_type))

                # Clean remaining tokens
                new_tokens = list(tokens)
                offset = len(start_bounds)
                for _ in range(len(remix)):
                    new_tokens.pop(offset)

                # TODO: Get a specific types for... types
                new_tokens.insert(offset, (subquery_type, remix))
                tokens = new_tokens

                resolved_parsed = replace_position(resolved_parsed, position, offset)
                session().annotate("RP: {}".format(resolved_parsed))
                session().annotate("AT: {}".format(atom))
                session().annotate("#########")


    tokens, matcher, result = make_template(knowledge_base, tokens, resolved_parsed)
    session().annotate("T: {}".format(tokens))
    session().annotate("M: {}".format(matcher))
    session().annotate("R: {}".format(result))
    session().annotate("---")
    yield tokens, matcher, result


def apply_remix(tokens, remix):
    rebuilt = []
    for i in remix:
        if isinstance(i, int):
            if i >= len(tokens):
                return None
            rebuilt.append(tokens[i])
        else:
            assert(isinstance(i, str))
            rebuilt.append(i)
    return rebuilt


def build_remix_matrix(knowledge_base, tokens, atom, similar):
    tokens = list(tokens)
    with session().log("Remix matrix for {} - {}".format(tokens, atom)):
        tokens, matcher, result = make_template(knowledge_base, tokens, atom)
        similar_matcher, similar_result, similar_result_resolved, _, _ = similar

        start_bounds, end_bounds = find_bounds(knowledge_base, matcher, similar_matcher)

        for i, element in (end_bounds + start_bounds[::-1]):
            matcher.pop(i)
            tokens.pop(i)

        possible_remixes = get_possible_remixes(knowledge_base, matcher, similar_matcher)
        session().annotate("Possible remixes: {}".format(possible_remixes))
        if len(possible_remixes) < 1:
            return None

        chosen_remix = possible_remixes[0]

        return chosen_remix, (start_bounds, end_bounds)


def get_possible_remixes(knowledge_base, matcher, similar_matcher):

    matrix = []
    with session().log("Possible remixes from matcher: {}".format(matcher)):
        for element in matcher:
            with session().log("Element `{}`".format(element)):
                session().annotate("Similar `{}`".format(similar_matcher))
                if element in similar_matcher or isinstance(element, dict):
                    if isinstance(element, dict):
                        indexes = all_matching_indexes(knowledge_base, similar_matcher, element)
                        session().annotate("Dict element matching: {}".format(indexes))
                    else:
                        indexes = all_indexes(similar_matcher, element)
                        session().annotate("* element matching: {}".format(indexes))
                    matrix.append(indexes)
                else:
                    session().annotate("`else` element matching: [element]")
                    matrix.append([element])

        # TODO: do some scoring to find the most "interesting combination"
        return [list(x) for x in list(zip(*matrix))]


def all_indexes(collection, element):
    indexes = []
    base = 0

    for _ in range(collection.count(element)):
        i = collection.index(element, base)
        base = i + 1
        indexes.append(i)

    return indexes


def all_matching_indexes(knowledge_base, collection, element):
    indexes = []

    with session().log('Matching “{}”'.format(element)):
        assert("groups" in element)
        element = element["groups"]
        for i, instance in enumerate(collection):
            session().log('Checking “{}”'.format(instance))

            if isinstance(instance, dict):
                instance = instance["groups"]
            elif instance in knowledge_base.knowledge:
                session().log('Knowledge about “{}”: ”{}”'.format(instance, knowledge_base.knowledge[instance]))

                if "groups" not in knowledge_base.knowledge[instance]:
                    # This means that is only known as token
                    # so we should try to avoid using it
                    continue

                instance = knowledge_base.knowledge[instance]["groups"]

            intersection = set(instance) & set(element)
            if (len(intersection) > 0 or (0 == len(instance) == len(element))):
                indexes.append((i, intersection))

        return [x[0] for x in sorted(indexes, key=lambda x: len(x[1]), reverse=True)]


def element_matches_groups(knowledge, element: Dict, groups):
  with session().log("Checking if e “{}” matches groups “{}”".format(element, groups)):
    if isinstance(groups, str) and groups in knowledge:
        return len(knowledge[groups].get("groups", set()) & element['groups']) > 0
    elif isinstance(groups, dict):
        return len(element.get("groups", set()) & element['groups']) > 0
    return False


def find_bounds(knowledge, matcher, similar_matcher):
    start_bounds = []
    for i, element in enumerate(matcher):
        if element in similar_matcher:
            break
        else:
            start_bounds.append((i, element))

    end_bounds = []
    for i, element in enumerate(matcher[::-1]):
        in_similar = False
        if isinstance(element, str):
            in_similar = element in similar_matcher
        elif isinstance(element, dict):
            in_similar = any(map(lambda groups: element_matches_groups(knowledge.knowledge,
                                                                       element, groups),
                                 similar_matcher))

        if in_similar:
            break
        else:
            end_bounds.append((len(matcher) - (i + 1), element))

    return start_bounds, end_bounds


def get_similar_tree(knowledge_base, atom, tokens):
    possibilities = []

    # Find matching possibilities
    for entry, tree in knowledge_base.trained:
        if not is_bottom_level(tree):
            continue
        if tree[0] == atom[0]:
            possibilities.append((entry, tree))

    # Sort by more matching elements
    sorted_possibilities = []
    for (raw, possibility) in possibilities:
        resolved = []
        for element in atom:
            if isinstance(element, str):
                resolved.append(element)
            else:
                resolved.append(knowledge_evaluation.resolve(
                    knowledge_base.knowledge,
                    element,
                    raw))

        # TODO: Probably should take into account the categories of the elements in the "intake" ([0]) element
        atom_score = sum([resolved[i] == atom[i]
                     for i
                     in range(min(len(resolved),
                                  len(atom)))])
        token_score = sum([similar_token in tokens
                           for similar_token
                           in raw])

        sorted_possibilities.append((raw, possibility, resolved, atom_score, token_score))

    sorted_possibilities = sorted(sorted_possibilities, key=lambda p: p[3] * 100 + p[4], reverse=True)
    if len(sorted_possibilities) < 1:
        return []

    for i, possibility in enumerate(sorted_possibilities):
        similar_matcher, similar_result, similar_result_resolved, _atom_score, _token_score = possibility
        with session().log("Like {}".format(similar_matcher)):
            session().annotate('AST: {}'.format(similar_result))
            session().annotate('Results on: {}'.format(similar_result_resolved))
            session().annotate('Atom score: {}'.format(_atom_score))
            session().annotate('Token score: {}'.format(_token_score))

    return sorted_possibilities


# TODO: unroll this mess
def get_matching(sample, other):
    l = len(sample[0])
    other = list(filter(lambda x: len(x[0]) == l, other))
    for i in range(l):
        if len(other) == 0:
            return []

        if isinstance(sample[0][i], dict): # Dictionaries are compared by groups
            other = list(filter(lambda x: isinstance(x[0][i], dict) and
                                len(x[0][i]['groups'] & sample[0][i]['groups']) > 0,
                                other))

        elif isinstance(sample[0][i], tuple): # Tuples are compared by types [0]
            other = list(filter(lambda x: isinstance(x[0][i], tuple) and
                                x[0][i][0] == sample[0][i][0],
                                other))

    matching = []
    for x in range(l):  # Generate the combination of this and other(s) matcher
        first_sample_data = sample[0][x]
        if isinstance(first_sample_data, str):
            matching.append(first_sample_data)
        elif isinstance(first_sample_data, tuple):
            matching.append(first_sample_data)
        else:
            this_groups = sample[0][x]['groups']
            if len(other) > 0:
                other_groups = reduce(lambda a, b: a & b,
                                      map(lambda y: y[0][x]['groups'],
                                          other))
                this_groups = this_groups & other_groups

            matching.append({'groups': this_groups})
    return matching


def reverse_remix(tree_section, remix):
    result_section = []
    offset = 0
    for origin in remix:
        if isinstance(origin, int):
            if (origin + offset) >= len(tree_section):
                return None

            result_section.append(copy.deepcopy(tree_section[origin + offset]))
        else:
            assert(isinstance(origin, str))
            offset += 1
    return result_section + tree_section[len(remix):]


def get_fit(knowledge, tokens, remaining_recursions=parameters.MAX_RECURSIONS):
    results = []
    for matcher, ast in knowledge.trained:
        with session().log("{} <- {}".format(matcher, tokens)):
            result = match_fit(knowledge, tokens, matcher, ast,
                               remaining_recursions)

            if result is not None:
                with session().log("Result: {}".format(result)):
                    results.append(result)

    if len(results) > 0:
        return results[0]


def is_definite_minisegment(minisegment):
    return isinstance(minisegment, str) or isinstance(minisegment, dict)


def match_token(knowledge, next_token, minisegment):
    if isinstance(minisegment, dict):
        return knowledge_evaluation.can_be_used_in_place(knowledge, next_token, minisegment)
    elif isinstance(minisegment, str):
        # TODO: check if the two elements can be used in each other place
        return next_token == minisegment

    return False


def resolve_fit(knowledge, fit, remaining_recursions):
    fitted = []
    for element in fit:
        if is_definite_minisegment(element):
            fitted.append(element)
        else:
            with session().log("Resolving fit of `{}`".format(element)):
                ((result_type, remixer), tokens) = element
                remixed_tokens = reverse_remix(tokens, remixer)
                if remixed_tokens is None:
                    return None

                minifit = get_fit(knowledge, remixed_tokens, remaining_recursions - 1)
                if minifit is None:
                    return None

                minitokens, miniast = minifit
                session().annotate(" AST | {}".format(miniast))
                subproperty = knowledge_evaluation.resolve(knowledge.knowledge, minitokens, miniast)
                fitted.append(subproperty)

    return fitted


def match_fit(knowledge, tokens, matcher, ast, remaining_recursions):
    segment_possibilities = [([], tokens)]  # Matched tokens, remaining tokens
    indent = ' ' * (parameters.MAX_RECURSIONS - remaining_recursions)
    session().annotate(indent + 'T> {}'.format(tokens))
    session().annotate(indent + 'M> {}'.format(matcher))
    for minisegment in matcher:
        with session().log("Minisegment `{}`".format(minisegment)):
            possibilities_after_round = []
            for matched_tokens, remaining_tokens in segment_possibilities:
                if len(remaining_tokens) < 1:
                    continue

                session().annotate(indent + "RT {}".format(remaining_tokens[0]))
                session().annotate(indent + "DEF {}".format(is_definite_minisegment(minisegment)))
                if is_definite_minisegment(minisegment):
                    # What if not match -----<
                    if match_token(knowledge, remaining_tokens[0], minisegment):
                        possibilities_after_round.append((
                            matched_tokens + [remaining_tokens[0]],
                            remaining_tokens[1:]
                           ))
                else:
                    # What if not match!!!!!!-----<
                    # TODO: optimize this with a look ahead
                    for i in range(1, len(tokens)):
                        possibilities_after_round.append((
                            matched_tokens + [(minisegment, remaining_tokens[:i])],
                            remaining_tokens[i:]
                           ))
                session().annotate(indent + "## PA {}".format(possibilities_after_round))
            else:
                segment_possibilities = possibilities_after_round
                for possibility in segment_possibilities:
                    with session().log("Possibility: `{}`".format(possibility)):
                        pass
                if len(segment_possibilities) < 1:
                    with session().log("NO POSSIBLE"):
                        pass

    fully_matched_segments = [(matched, remaining)
                              for (matched, remaining)
                              in segment_possibilities
                              if len(remaining) == 0]

    resolved_fits = []
    with session().log("Full matches"):
        for fit, _ in fully_matched_segments:
            with session().log(fit):  # REMIXES HAVE TO BE APPLIED BEFORE!!!
                pass

    with session().log("Resolutions"):
        for fit, _ in fully_matched_segments:
            with session().log("Resolving {}".format(fit)):  # REMIXES HAVE TO BE APPLIED BEFORE!!!
                resolved_fit = resolve_fit(knowledge, fit, remaining_recursions)
                if resolved_fit is not None:
                    resolved_fits.append(resolved_fit)
                else:
                    session().annotate("Not resolved")

    if len(resolved_fits) == 0:
        return None

    return resolved_fits[0], ast