# coding: utf-8
"""Script to process Wikipedia and Wikidata dumps and create a knowledge base (KB)
with specific parameters. Intermediate files are written to disk.

Running the full pipeline on a standard laptop, may take up to 13 hours of processing.
Use the -p, -d and -s options to speed up processing using the intermediate files
from a previous run.

For the Wikidata dump: get the latest-all.json.bz2 from https://dumps.wikimedia.org/wikidatawiki/entities/
For the Wikipedia dump: get enwiki-latest-pages-articles-multistream.xml.bz2
from https://dumps.wikimedia.org/enwiki/latest/

"""
from __future__ import unicode_literals

import datetime
from pathlib import Path
import plac

from bin.wiki_entity_linking import wikipedia_processor as wp
from bin.wiki_entity_linking import kb_creator

import spacy

from spacy import Errors


def now():
    return datetime.datetime.now()


@plac.annotations(
    wd_json=("Path to the downloaded WikiData JSON dump.", "positional", None, Path),
    wp_xml=("Path to the downloaded Wikipedia XML dump.", "positional", None, Path),
    output_dir=("Output directory", "positional", None, Path),
    model=("Model name, should include pretrained vectors.", "positional", None, str),
    max_per_alias=("Max. # entities per alias (default 10)", "option", "a", int),
    min_freq=("Min. count of an entity in the corpus (default 20)", "option", "f", int),
    min_pair=("Min. count of entity-alias pairs (default 5)", "option", "c", int),
    entity_vector_length=("Length of entity vectors (default 64)", "option", "v", int),
    loc_prior_prob=("Location to file with prior probabilities", "option", "p", Path),
    loc_entity_defs=("Location to file with entity definitions", "option", "d", Path),
    loc_entity_desc=("Location to file with entity descriptions", "option", "s", Path),
    limit=("Optional threshold to limit lines read from dumps", "option", "l", int),
)
def main(
    wd_json,
    wp_xml,
    output_dir,
    model,
    max_per_alias=10,
    min_freq=20,
    min_pair=5,
    entity_vector_length=64,
    loc_prior_prob=None,
    loc_entity_defs=None,
    loc_entity_desc=None,
    limit=None,
):
    print(now(), "Creating KB with Wikipedia and WikiData")
    print()

    if limit is not None:
        print("Warning: reading only", limit, "lines of Wikipedia/Wikidata dumps.")

    # STEP 0: set up IO
    if not output_dir.exists():
        output_dir.mkdir()

    # STEP 1: create the NLP object
    print(now(), "STEP 1: loaded model", model)
    nlp = spacy.load(model)

    # check the length of the nlp vectors
    if "vectors" not in nlp.meta or not nlp.vocab.vectors.size:
        raise ValueError(
            "The `nlp` object should have access to pre-trained word vectors, "
            " cf. https://spacy.io/usage/models#languages."
        )

    # STEP 2: create prior probabilities from WP
    print()
    if loc_prior_prob:
        print(now(), "STEP 2: reading prior probabilities from", loc_prior_prob)
    else:
        # It takes about 2h to process 1000M lines of Wikipedia XML dump
        loc_prior_prob = output_dir / "prior_prob.csv"
        print(now(), "STEP 2: writing prior probabilities at", loc_prior_prob)
        wp.read_prior_probs(wp_xml, loc_prior_prob, limit=limit)

    # STEP 3: deduce entity frequencies from WP (takes only a few minutes)
    print()
    print(now(), "STEP 3: calculating entity frequencies")
    loc_entity_freq = output_dir / "entity_freq.csv"
    wp.write_entity_counts(loc_prior_prob, loc_entity_freq, to_print=False)

    loc_kb = output_dir / "kb"

    # STEP 4: reading entity descriptions and definitions from WikiData or from file
    print()
    if loc_entity_defs and loc_entity_desc:
        read_raw = False
        print(now(), "STEP 4a: reading entity definitions from", loc_entity_defs)
        print(now(), "STEP 4b: reading entity descriptions from", loc_entity_desc)
    else:
        # It takes about 10h to process 55M lines of Wikidata JSON dump
        read_raw = True
        loc_entity_defs = output_dir / "entity_defs.csv"
        loc_entity_desc = output_dir / "entity_descriptions.csv"
        print(now(), "STEP 4: parsing wikidata for entity definitions and descriptions")

    # STEP 5: creating the actual KB
    # It takes ca. 30 minutes to pretrain the entity embeddings
    print()
    print(now(), "STEP 5: creating the KB at", loc_kb)
    kb = kb_creator.create_kb(
        nlp=nlp,
        max_entities_per_alias=max_per_alias,
        min_entity_freq=min_freq,
        min_occ=min_pair,
        entity_def_output=loc_entity_defs,
        entity_descr_output=loc_entity_desc,
        count_input=loc_entity_freq,
        prior_prob_input=loc_prior_prob,
        wikidata_input=wd_json,
        entity_vector_length=entity_vector_length,
        limit=limit,
        read_raw_data=read_raw,
    )
    if read_raw:
        print(" - wrote entity definitions to", loc_entity_defs)
        print(" - wrote writing entity descriptions to", loc_entity_desc)

    kb.dump(loc_kb)
    nlp.to_disk(output_dir / "nlp")

    print()
    print(now(), "Done!")


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