import csv
import json
import os
import random
import string
import sys
from datetime import datetime
from io import StringIO

from devtools import debug
from functools import partial
from pathlib import Path
from statistics import StatisticsError, mean
from statistics import stdev as stdev_

from test_pydantic import TestPydantic
from test_trafaret import TestTrafaret
from test_drf import TestDRF
from test_marshmallow import TestMarshmallow
from test_toasted_marshmallow import TestToastedMarshmallow

PUNCTUATION = ' \t\n!"#$%&\'()*+,-./'
LETTERS = string.ascii_letters
UNICODE = '\xa0\xad¡¢£¤¥¦§¨©ª«¬ ®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ'
ALL = PUNCTUATION * 5 + LETTERS * 20 + UNICODE
random = random.SystemRandom()


class GenerateData:
    def __init__(self):
        pass


def rand_string(min_length, max_length, corpus=ALL):
    return ''.join(random.choices(corpus, k=random.randrange(min_length, max_length)))


MISSING = object()


def null_missing_v(f, null_chance=0.2, missing_chance=None):
    r = random.random()
    if random.random() < null_chance:
        return None
    missing_chance = null_chance if missing_chance is None else missing_chance
    if r < (null_chance + missing_chance):
        return MISSING
    return f()


def null_missing_string(*args, **kwargs):
    f = partial(rand_string, *args)
    return null_missing_v(f, **kwargs)


def rand_email():
    if random.random() < 0.2:
        c1, c2 = UNICODE, LETTERS
    else:
        c1, c2 = LETTERS, LETTERS
    return f'{rand_string(10, 50, corpus=c1)}@{rand_string(10, 50, corpus=c2)}.{rand_string(2, 5, corpus=c2)}'


def null_missing_email():
    return null_missing_v(rand_email)


def rand_date():
    r = random.randrange
    return f'{r(1900, 2020)}-{r(0, 12)}-{r(0, 32)}T{r(0, 24)}:{r(0, 60)}:{r(0, 60)}'


def remove_missing(d):
    if isinstance(d, dict):
        return {k: remove_missing(v) for k, v in d.items() if v is not MISSING}
    elif isinstance(d, list):
        return [remove_missing(d_) for d_ in d]
    else:
        return d


def generate_case():
    return remove_missing(dict(
        id=random.randrange(1, 2000),
        client_name=null_missing_string(10, 280, null_chance=0.05, missing_chance=0.05),
        sort_index=random.random() * 200,
        # client_email=null_missing_email(),  # email checks differ with different frameworks
        client_phone=null_missing_string(5, 15),
        location=dict(
            latitude=random.random() * 180 - 90,
            longitude=random.random() * 180,
        ),
        contractor=str(random.randrange(-100, 2000)),
        upstream_http_referrer=null_missing_string(10, 1050),
        grecaptcha_response=null_missing_string(10, 1050, null_chance=0.05, missing_chance=0.05),
        last_updated=rand_date(),
        skills=[dict(
            subject=null_missing_string(5, 20, null_chance=0.01, missing_chance=0),
            subject_id=i,
            category=rand_string(5, 20),
            qual_level=rand_string(5, 20),
            qual_level_id=random.randrange(2000),
            qual_level_ranking=random.random() * 20
        ) for i in range(random.randrange(1, 5))]
    ))

THIS_DIR = Path(__file__).parent.resolve()


def stdev(d):
    try:
        return stdev_(d)
    except StatisticsError:
        return 0


def main():
    json_path = THIS_DIR / 'cases.json'
    if not json_path.exists():
        print('generating test cases...')
        cases = [generate_case() for _ in range(2000)]
        with json_path.open('w') as f:
            json.dump(cases, f, indent=2, sort_keys=True)
    else:
        with json_path.open() as f:
            cases = json.load(f)

    if 'pydantic-only' in sys.argv:
        tests = [TestPydantic]
    else:
        # in order of performance for csv
        tests = [TestPydantic, TestToastedMarshmallow, TestMarshmallow, TestTrafaret, TestDRF]

    repeats = int(os.getenv('BENCHMARK_REPEATS', '5'))
    results = []
    csv_file = StringIO()
    csv_writer = csv.writer(csv_file)
    for test_class in tests:
        times = []
        p = test_class.package
        for i in range(repeats):
            count, pass_count = 0, 0
            start = datetime.now()
            test = test_class(True)
            for i in range(3):
                for case in cases:
                    passed, result = test.validate(case)
                    count += 1
                    pass_count += passed
            time = (datetime.now() - start).total_seconds()
            success = pass_count / count * 100
            print(f'{p:>40} time={time:0.3f}s, success={success:0.2f}%')
            times.append(time)
        print(f'{p:>40} best={min(times):0.3f}s, avg={mean(times):0.3f}s, stdev={stdev(times):0.3f}s')
        model_count = repeats * 3 * len(cases)
        avg = mean(times) / model_count * 1e6
        sd = stdev(times) / model_count * 1e6
        results.append(f'{p:>40} best={min(times) / model_count * 1e6:0.3f}μs/iter '
                       f'avg={avg:0.3f}μs/iter stdev={sd:0.3f}μs/iter')
        csv_writer.writerow([p, f'{avg:0.1f}μs', f'{sd:0.3f}μs'])
        print()

    for r in results:
        print(r)

    if 'SAVE' in os.environ:
        p = Path(THIS_DIR / '../docs/benchmarks.csv')
        print(f'saving results to {p}')
        p.write_text(csv_file.getvalue())


def diff():
    json_path = THIS_DIR / 'cases.json'
    with json_path.open() as f:
        cases = json.load(f)

    allow_extra = True
    pydantic = TestPydantic(allow_extra)
    others = [
        TestTrafaret(allow_extra),
        TestDRF(allow_extra),
        TestMarshmallow(allow_extra),
        TestToastedMarshmallow(allow_extra)
    ]

    for case in cases:
        pydantic_passed, pydantic_result = pydantic.validate(case)
        for other in others:
            other_passed, other_result = other.validate(case)
            if other_passed != pydantic_passed:
                print(f'⨯ pydantic {pydantic_passed} != {other.package} {other_passed}')
                debug(case, pydantic_result, other_result)
                return
    print('✓ data passes match for all packages')


if __name__ == '__main__':
    if 'diff' in sys.argv:
        diff()
    else:
        main()