import difflib
import time
import logging
from io import IOBase


class TSV:
    """Helper to get pretty diffs between expected and actual tab-separated value files"""

    def __init__(self, contents):
        if isinstance(contents, IOBase):
            raw_lines = contents.readlines()
        elif isinstance(contents, str) or isinstance(contents, str):
            raw_lines = contents.splitlines(True)
        elif isinstance(contents, list):
            raw_lines = ['\t'.join(map(str, l)) if isinstance(l, list) else str(l) for l in contents]
        elif isinstance(contents, TSV):
            self.lines = contents.lines
            return
        else:
            raise TypeError("contents must be either file or string or list, actual type: " + type(contents).__name__)
        self.lines = [l.strip() for l in raw_lines if l.strip()]

    def __eq__(self, other):
        if not isinstance(other, TSV):
            return self == TSV(other)
        return self.lines == other.lines

    def __ne__(self, other):
        if not isinstance(other, TSV):
            return self != TSV(other)
        return self.lines != other.lines

    def diff(self, other, n1='', n2=''):
        if not isinstance(other, TSV):
            return self.diff(TSV(other), n1=n1, n2=n2)
        return list(line.rstrip() for line in difflib.unified_diff(self.lines, other.lines, fromfile=n1, tofile=n2))[2:]

    def __str__(self):
        return '\n'.join(self.lines)

    def __repr__(self):
        return self.__str__()

    def __len__(self):
        return len(self.lines)

    @staticmethod
    def toMat(contents):
        return [line.split("\t") for line in contents.split("\n") if line.strip()]


def assert_eq_with_retry(instance, query, expectation, retry_count=20, sleep_time=0.5, stdin=None, timeout=None,
                         settings=None, user=None, ignore_error=False, get_result=lambda x: x):
    expectation_tsv = TSV(expectation)
    for i in range(retry_count):
        try:
            if TSV(get_result(instance.query(query, user=user, stdin=stdin, timeout=timeout, settings=settings,
                                  ignore_error=ignore_error))) == expectation_tsv:
                break
            time.sleep(sleep_time)
        except Exception as ex:
            logging.exception(f"assert_eq_with_retry retry {i+1} exception {ex}")
            time.sleep(sleep_time)
    else:
        val = TSV(get_result(instance.query(query, user=user, stdin=stdin, timeout=timeout, settings=settings,
                                 ignore_error=ignore_error)))
        if expectation_tsv != val:
            raise AssertionError("'{}' != '{}'\n{}".format(expectation_tsv, val, '\n'.join(
                expectation_tsv.diff(val, n1="expectation", n2="query"))))

def assert_logs_contain(instance, substring):
    if not instance.contains_in_log(substring):
        raise AssertionError("'{}' not found in logs".format(substring))

def assert_logs_contain_with_retry(instance, substring, retry_count=20, sleep_time=0.5):
    for i in range(retry_count):
        try:
            if instance.contains_in_log(substring):
                break
            time.sleep(sleep_time)
        except Exception as ex:
            logging.exception(f"contains_in_log_with_retry retry {i+1} exception {ex}")
            time.sleep(sleep_time)
    else:
        raise AssertionError("'{}' not found in logs".format(substring))

def exec_query_with_retry(instance, query, retry_count=40, sleep_time=0.5, silent=False, settings={}):
    exception = None
    for cnt in range(retry_count):
        try:
            res = instance.query(query, timeout=30, settings=settings)
            if not silent:
                logging.debug(f"Result of {query} on {cnt} try is {res}")
            break
        except Exception as ex:
            exception = ex
            if not silent:
                logging.exception(f"Failed to execute query '{query}' on  {cnt} try on instance '{instance.name}' will retry")
            time.sleep(sleep_time)
    else:
        raise exception

def csv_compare(result, expected):
    csv_result = TSV(result)
    csv_expected = TSV(expected)
    mismatch = []
    max_len = len(csv_result) if len(csv_result) > len(csv_expected) else len(csv_expected)
    for i in range(max_len):
        if i >= len(csv_result):
            mismatch.append("-[%d]=%s" % (i, csv_expected.lines[i]))
        elif i >= len(csv_expected):
            mismatch.append("+[%d]=%s" % (i, csv_result.lines[i]))
        elif csv_expected.lines[i] != csv_result.lines[i]:
            mismatch.append("-[%d]=%s" % (i, csv_expected.lines[i]))
            mismatch.append("+[%d]=%s" % (i, csv_result.lines[i]))

    return "\n".join(mismatch)