"""
Test the performance of the search in terms of compression and speed.
"""
import json
import numpy as np
import os
from datetime import datetime
from itertools import islice

from spacy.lang.en import English
from starlette.testclient import TestClient

from app import app, complete
from index import TinyIndexer, index_titles_and_urls, PAGE_SIZE, NUM_PAGES
from paths import TEST_INDEX_PATH
from wiki import get_wiki_titles_and_urls


NUM_DOCUMENTS = 30000
NUM_PAGES_FOR_STATS = 10


def query_test():
    titles_and_urls = get_wiki_titles_and_urls()

    client = TestClient(app)

    start = datetime.now()
    hits = 0
    for title, url in islice(titles_and_urls, NUM_DOCUMENTS):
        result = client.get('/complete', params={'q': title})
        assert result.status_code == 200
        data = result.content.decode('utf8')
        # print("Data", data, url, sep='\n')

        if title in data:
            hits += 1

    end = datetime.now()
    print("Hits:", hits)
    print("Query time:", (end - start).total_seconds() / NUM_DOCUMENTS)


def page_stats(indexer: TinyIndexer):
    page_sizes = []
    for i in range(NUM_PAGES):
        page = indexer.get_page(i)
        if page is not None:
            page_sizes.append(len(page))
    big_page_sizes = sorted(page_sizes)[-NUM_PAGES_FOR_STATS:]
    return np.mean(big_page_sizes), np.std(big_page_sizes)


def performance_test():
    nlp = English()
    try:
        os.remove(TEST_INDEX_PATH)
    except FileNotFoundError:
        print("No test index found, creating")
    with TinyIndexer(TEST_INDEX_PATH, NUM_PAGES, PAGE_SIZE) as indexer:
        titles_and_urls = get_wiki_titles_and_urls()
        titles_and_urls_slice = islice(titles_and_urls, NUM_DOCUMENTS)

        start_time = datetime.now()
        index_titles_and_urls(indexer, nlp, titles_and_urls_slice)
        stop_time = datetime.now()

        index_time = (stop_time - start_time).total_seconds()
        index_size = os.path.getsize(TEST_INDEX_PATH)

        page_size_mean, page_size_std = page_stats(indexer)

    print("Indexed pages:", NUM_DOCUMENTS)
    print("Index time:", index_time)
    print("Index size:", index_size)
    print("Mean docs per page:", page_size_mean)
    print("Std err of docs per page:", page_size_std)
    # print("Num tokens", indexer.get_num_tokens())

    query_test()


if __name__ == '__main__':
    performance_test()