#!/usr/bin/env python
from __future__ import division
from __future__ import unicode_literals

import os
from os import path
import shutil
import codecs
import random

import plac
import cProfile
import pstats
import re

import spacy.util
from spacy.en import English
from spacy.en.pos import POS_TEMPLATES, POS_TAGS, setup_model_dir

from spacy.syntax.parser import GreedyParser
from spacy.syntax.parser import OracleError
from spacy.syntax.util import Config
from spacy.gold import read_json_file
from spacy.gold import GoldParse

from spacy.scorer import Scorer


def add_noise(c, noise_level):
    if random.random() >= noise_level:
        return c
    elif c == ' ':
        return '\n'
    elif c == '\n':
        return ' '
    elif c in ['.', "'", "!", "?"]:
        return ''
    else:
        return c.lower()


def train(Language, gold_tuples, model_dir, n_iter=15, feat_set=u'basic', seed=0,
          gold_preproc=False, n_sents=0, corruption_level=0):
    dep_model_dir = path.join(model_dir, 'deps')
    pos_model_dir = path.join(model_dir, 'pos')
    ner_model_dir = path.join(model_dir, 'ner')
    if path.exists(dep_model_dir):
        shutil.rmtree(dep_model_dir)
    if path.exists(pos_model_dir):
        shutil.rmtree(pos_model_dir)
    if path.exists(ner_model_dir):
        shutil.rmtree(ner_model_dir)
    os.mkdir(dep_model_dir)
    os.mkdir(pos_model_dir)
    os.mkdir(ner_model_dir)

    setup_model_dir(sorted(POS_TAGS.keys()), POS_TAGS, POS_TEMPLATES, pos_model_dir)

    Config.write(dep_model_dir, 'config', features=feat_set, seed=seed,
                 labels=Language.ParserTransitionSystem.get_labels(gold_tuples))
    Config.write(ner_model_dir, 'config', features='ner', seed=seed,
                 labels=Language.EntityTransitionSystem.get_labels(gold_tuples))

    if n_sents > 0:
        gold_tuples = gold_tuples[:n_sents]
    nlp = Language(data_dir=model_dir)

    print "Itn.\tP.Loss\tUAS\tNER F.\tTag %\tToken %"
    for itn in range(n_iter):
        scorer = Scorer()
        loss = 0
        for raw_text, annot_tuples, ctnt in gold_tuples:
            if corruption_level != 0:
                raw_text = ''.join(add_noise(c, corruption_level) for c in raw_text)
            tokens = nlp(raw_text, merge_mwes=False)
            gold = GoldParse(tokens, annot_tuples)
            scorer.score(tokens, gold, verbose=False)
            assert not gold_preproc
            sents = [nlp.tokenizer(raw_text)]
            for tokens in sents:
                gold = GoldParse(tokens, annot_tuples)
                nlp.tagger(tokens)
                try:
                    loss += nlp.parser.train(tokens, gold)
                except AssertionError:
                    # TODO: Do something about non-projective sentences
                    continue
                if gold.ents:
                    nlp.entity.train(tokens, gold)
                nlp.tagger.train(tokens, gold.tags)

        print '%d:\t%d\t%.3f\t%.3f\t%.3f\t%.3f' % (itn, loss, scorer.uas, scorer.ents_f,
                                               scorer.tags_acc,
                                               scorer.token_acc)
        random.shuffle(gold_tuples)
    nlp.parser.model.end_training()
    nlp.entity.model.end_training()
    nlp.tagger.model.end_training()
    nlp.vocab.strings.dump(path.join(model_dir, 'vocab', 'strings.txt'))


def evaluate(Language, gold_tuples, model_dir, gold_preproc=False, verbose=True):
    assert not gold_preproc
    nlp = Language(data_dir=model_dir)
    scorer = Scorer()
    for raw_text, annot_tuples, brackets in gold_tuples:
        tokens = nlp(raw_text, merge_mwes=False)
        gold = GoldParse(tokens, annot_tuples)
        scorer.score(tokens, gold, verbose=verbose)
    return scorer


def write_parses(Language, dev_loc, model_dir, out_loc):
    nlp = Language()
    gold_tuples = read_docparse_file(dev_loc)
    scorer = Scorer()
    out_file = codecs.open(out_loc, 'w', 'utf8')
    for raw_text, segmented_text, annot_tuples in gold_tuples:
        tokens = nlp(raw_text)
        for t in tokens:
            out_file.write(
                '%s\t%s\t%s\t%s\n' % (t.orth_, t.tag_, t.head.orth_, t.dep_)
            )
    return scorer


@plac.annotations(
    train_loc=("Location of training json file"),
    dev_loc=("Location of development json file"),
    corruption_level=("Amount of noise to add to training data", "option", "c", float),
    model_dir=("Location of output model directory",),
    out_loc=("Out location", "option", "o", str),
    n_sents=("Number of training sentences", "option", "n", int),
    n_iter=("Number of training iterations", "option", "i", int),
    verbose=("Verbose error reporting", "flag", "v", bool),
    debug=("Debug mode", "flag", "d", bool)
)
def main(train_loc, dev_loc, model_dir, n_sents=0, n_iter=15, out_loc="", verbose=False,
         debug=False, corruption_level=0.0):
    train(English, read_json_file(train_loc), model_dir,
          feat_set='basic' if not debug else 'debug',
          gold_preproc=False, n_sents=n_sents,
          corruption_level=corruption_level, n_iter=n_iter)
    if out_loc:
        write_parses(English, dev_loc, model_dir, out_loc)
    scorer = evaluate(English, read_json_file(dev_loc),
                      model_dir, gold_preproc=False, verbose=verbose)
    print 'TOK', 100-scorer.token_acc
    print 'POS', scorer.tags_acc
    print 'UAS', scorer.uas
    print 'LAS', scorer.las

    print 'NER P', scorer.ents_p
    print 'NER R', scorer.ents_r
    print 'NER F', scorer.ents_f


if __name__ == '__main__':
    plac.call(main)