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#!/opt/alt/python37/bin/python3

import re
from dataclasses import dataclass, asdict
from sqlalchemy import func
from sqlalchemy.sql.expression import literal_column
from wmt.common import cfg

from wmt.db import ScrapeResult, session_scope


@dataclass
class SummaryReport:
    count_all: int
    count_successful: int
    count_failed: int
    count_undone: int
    average_time: float

    def to_template(self, *args):
        return [self.count_all,
                self.count_successful,
                self.count_failed,
                self.count_undone,
                # emails need time in ms
                int(self.average_time / 10**3)]


@dataclass
class ErrorReport:
    code: str
    count_errors: int
    url: str

    def to_template(self, alternative):
        url = url_to_domain(self.url)
        if alternative == 'html':
            url = f'<a href="{self.url}">{url}</a>'
        return [url,
                self.code]


@dataclass
class DurationReport:
    url: str
    average_time: float

    def to_template(self, alternative):
        url = url_to_domain(self.url)
        if alternative == 'html':
            url = f'<a href="{self.url}">{url}</a>'
        return [url,
                # emails need time in ms
                int(self.average_time / 10**3)]


def url_to_domain(url):
    pattern = r'http(s)?://'
    return re.sub(pattern, '', url)


def generate_report(engine, start_date, end_date):
    with session_scope(engine) as session:
        # gets counter per status code per website -> group key: website: status_code pair
        # e.g (test.com 404 3), (test.com 500 2)
        subquery = session.query(ScrapeResult.response_code,
                                 ScrapeResult.website,
                                 func.count().label('err_count')).\
            filter(ScrapeResult.create_date >= start_date,
                   ScrapeResult.create_date <= end_date,
                   ScrapeResult.response_code != 200,
                   ScrapeResult.is_finished == True)\
            .group_by(ScrapeResult.response_code, ScrapeResult.website)\
            .subquery()

        # group previous subquery by website
        # code     count  website
        # [('451,500', 3, 'http://www.flightradar24.com'),
        #  ('404', 2, 'http://broken.com')]
        error_stats = session.query(func.group_concat(subquery.c.response_code),
                                    func.sum(subquery.c.err_count),
                                    subquery.c.website)\
            .group_by(subquery.c.website)\
            .all()
        #  website                          avg ms             count
        # [('http://www.stackoverflow.com', 538.0816599732262, 2241),
        # ('http://www.suser.com',          66.53859883980365, 2241)]
        success_stats = session.query(ScrapeResult.website,
                                      func.avg(ScrapeResult.response_time_ms).label('average_time'),
                                      func.count())\
            .filter(ScrapeResult.create_date >= start_date,
                    ScrapeResult.create_date <= end_date,
                    ScrapeResult.response_code == 200)\
            .group_by(ScrapeResult.website)\
            .order_by(literal_column('average_time').desc()) \
            .all()

        count_unsuccessful = session.query(ScrapeResult)\
            .filter(ScrapeResult.create_date >= start_date,
                    ScrapeResult.create_date <= end_date,
                    ScrapeResult.is_finished == False)\
            .count()

    success_stats = [(url, average_time, count) for url, average_time, count in success_stats if
                     not cfg.is_domain_ignored(url)]

    error_stats = [(code, count, url) for code, count, url in error_stats if
                   not cfg.is_domain_ignored(url)]

    error_report = [ErrorReport(code=code, count_errors=count_errors, url=url)
                    for code, count_errors, url in error_stats]

    duration_report = [DurationReport(url=url, average_time=int(round(average_time * 1000)))
                       for url, average_time, _ in success_stats]

    successful_requests_count = sum(success_count for url, _, success_count in success_stats)
    error_requests_count = sum(errors_count for _, errors_count, url in error_stats)

    averages = [item[1] for item in success_stats]
    average_count = 0 if not averages else int(round(1000 * sum(averages) / len(averages)))
    summary_report = SummaryReport(count_all=successful_requests_count + error_requests_count + count_unsuccessful,
                                   count_successful=successful_requests_count,
                                   count_failed=error_requests_count,
                                   count_undone=count_unsuccessful,
                                   average_time=average_count)
    return {
        'summary_report': summary_report,
        'error_report': error_report,
        'duration_report': duration_report
    }


def report_dict(report):
    return {
        'summary_report': asdict(report['summary_report']),
        'error_report': [asdict(item) for item in report['error_report']],
        'duration_report': [asdict(item) for item in report['duration_report']]
    }
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