"""Classes for storing and processing test results."""

from __future__ import absolute_import, print_function

import datetime
import json
import os

from lib.util import (
    display,
)

from lib.config import (
    TestConfig,
)


def calculate_best_confidence(choices, metadata):
    """
    :type choices: tuple[tuple[str, int]]
    :type metadata: Metadata
    :rtype: int
    """
    best_confidence = 0

    for path, line in choices:
        confidence = calculate_confidence(path, line, metadata)
        best_confidence = max(confidence, best_confidence)

    return best_confidence


def calculate_confidence(path, line, metadata):
    """
    :type path: str
    :type line: int
    :type metadata: Metadata
    :rtype: int
    """
    ranges = metadata.changes.get(path)

    # no changes were made to the file
    if not ranges:
        return 0

    # changes were made to the same file and line
    if any(r[0] <= line <= r[1] in r for r in ranges):
        return 100

    # changes were made to the same file and the line number is unknown
    if line == 0:
        return 75

    # changes were made to the same file and the line number is different
    return 50


class TestResult(object):
    """Base class for test results."""
    def __init__(self, command, test, python_version=None):
        """
        :type command: str
        :type test: str
        :type python_version: str
        """
        self.command = command
        self.test = test
        self.python_version = python_version
        self.name = self.test or self.command

        if self.python_version:
            self.name += '-python-%s' % self.python_version

        try:
            import junit_xml
        except ImportError:
            junit_xml = None

        self.junit = junit_xml

    def write(self, args):
        """
        :type args: TestConfig
        """
        self.write_console()
        self.write_bot(args)

        if args.lint:
            self.write_lint()

        if args.junit:
            if self.junit:
                self.write_junit(args)
            else:
                display.warning('Skipping junit xml output because the `junit-xml` python package was not found.', unique=True)

    def write_console(self):
        """Write results to console."""
        pass

    def write_lint(self):
        """Write lint results to stdout."""
        pass

    def write_bot(self, args):
        """
        :type args: TestConfig
        """
        pass

    def write_junit(self, args):
        """
        :type args: TestConfig
        """
        pass

    def create_path(self, directory, extension):
        """
        :type directory: str
        :type extension: str
        :rtype: str
        """
        path = 'test/results/%s/ansible-test-%s' % (directory, self.command)

        if self.test:
            path += '-%s' % self.test

        if self.python_version:
            path += '-python-%s' % self.python_version

        path += extension

        return path

    def save_junit(self, args, test_case, properties=None):
        """
        :type args: TestConfig
        :type test_case: junit_xml.TestCase
        :type properties: dict[str, str] | None
        :rtype: str | None
        """
        path = self.create_path('junit', '.xml')

        test_suites = [
            self.junit.TestSuite(
                name='ansible-test',
                test_cases=[test_case],
                timestamp=datetime.datetime.utcnow().replace(microsecond=0).isoformat(),
                properties=properties,
            ),
        ]

        report = self.junit.TestSuite.to_xml_string(test_suites=test_suites, prettyprint=True, encoding='utf-8')

        if args.explain:
            return

        with open(path, 'wb') as xml:
            xml.write(report.encode('utf-8', 'strict'))


class TestSuccess(TestResult):
    """Test success."""
    def write_junit(self, args):
        """
        :type args: TestConfig
        """
        test_case = self.junit.TestCase(classname=self.command, name=self.name)

        self.save_junit(args, test_case)


class TestSkipped(TestResult):
    """Test skipped."""
    def write_console(self):
        """Write results to console."""
        display.info('No tests applicable.', verbosity=1)

    def write_junit(self, args):
        """
        :type args: TestConfig
        """
        test_case = self.junit.TestCase(classname=self.command, name=self.name)
        test_case.add_skipped_info('No tests applicable.')

        self.save_junit(args, test_case)


class TestFailure(TestResult):
    """Test failure."""
    def __init__(self, command, test, python_version=None, messages=None, summary=None):
        """
        :type command: str
        :type test: str
        :type python_version: str | None
        :type messages: list[TestMessage] | None
        :type summary: unicode | None
        """
        super(TestFailure, self).__init__(command, test, python_version)

        if messages:
            messages = sorted(messages, key=lambda m: m.sort_key)
        else:
            messages = []

        self.messages = messages
        self.summary = summary

    def write(self, args):
        """
        :type args: TestConfig
        """
        if args.metadata.changes:
            self.populate_confidence(args.metadata)

        super(TestFailure, self).write(args)

    def write_console(self):
        """Write results to console."""
        if self.summary:
            display.error(self.summary)
        else:
            if self.python_version:
                specifier = ' on python %s' % self.python_version
            else:
                specifier = ''

            display.error('Found %d %s issue(s)%s which need to be resolved:' % (len(self.messages), self.test or self.command, specifier))

            for message in self.messages:
                display.error(message.format(show_confidence=True))

    def write_lint(self):
        """Write lint results to stdout."""
        if self.summary:
            command = self.format_command()
            message = 'The test `%s` failed. See stderr output for details.' % command
            path = 'test/runner/ansible-test'
            message = TestMessage(message, path)
            print(message)
        else:
            for message in self.messages:
                print(message)

    def write_junit(self, args):
        """
        :type args: TestConfig
        """
        title = self.format_title()
        output = self.format_block()

        test_case = self.junit.TestCase(classname=self.command, name=self.name)

        # Include a leading newline to improve readability on Shippable "Tests" tab.
        # Without this, the first line becomes indented.
        test_case.add_failure_info(message=title, output='\n%s' % output)

        self.save_junit(args, test_case)

    def write_bot(self, args):
        """
        :type args: TestConfig
        """
        docs = self.find_docs()
        message = self.format_title(help_link=docs)
        output = self.format_block()

        if self.messages:
            verified = all((m.confidence or 0) >= 50 for m in self.messages)
        else:
            verified = False

        bot_data = dict(
            verified=verified,
            docs=docs,
            results=[
                dict(
                    message=message,
                    output=output,
                ),
            ],
        )

        path = self.create_path('bot', '.json')

        if args.explain:
            return

        with open(path, 'w') as bot_fd:
            json.dump(bot_data, bot_fd, indent=4, sort_keys=True)
            bot_fd.write('\n')

    def populate_confidence(self, metadata):
        """
        :type metadata: Metadata
        """
        for message in self.messages:
            if message.confidence is None:
                message.confidence = calculate_confidence(message.path, message.line, metadata)

    def format_command(self):
        """
        :rtype: str
        """
        command = 'ansible-test %s' % self.command

        if self.test:
            command += ' --test %s' % self.test

        if self.python_version:
            command += ' --python %s' % self.python_version

        return command

    def find_docs(self):
        """
        :rtype: str
        """
        testing_docs_url = 'https://docs.ansible.com/ansible/devel/dev_guide/testing'
        testing_docs_dir = 'docs/docsite/rst/dev_guide/testing'

        url = '%s/%s/' % (testing_docs_url, self.command)
        path = os.path.join(testing_docs_dir, self.command)

        if self.test:
            url += '%s.html' % self.test
            path = os.path.join(path, '%s.rst' % self.test)

        if os.path.exists(path):
            return url

        return None

    def format_title(self, help_link=None):
        """
        :type help_link: str | None
        :rtype: str
        """
        command = self.format_command()

        if self.summary:
            reason = 'error'
        else:
            reason = 'error' if len(self.messages) == 1 else 'errors'

        if help_link:
            help_link_markup = ' [[?](%s)]' % help_link
        else:
            help_link_markup = ''

        title = 'The test `%s`%s failed with the following %s:' % (command, help_link_markup, reason)

        return title

    def format_block(self):
        """
        :rtype: str
        """
        if self.summary:
            block = self.summary
        else:
            block = '\n'.join(m.format() for m in self.messages)

        message = block.strip()

        # Hack to remove ANSI color reset code from SubprocessError messages.
        message = message.replace(display.clear, '')

        return message


class TestMessage(object):
    """Single test message for one file."""
    def __init__(self, message, path, line=0, column=0, level='error', code=None, confidence=None):
        """
        :type message: str
        :type path: str
        :type line: int
        :type column: int
        :type level: str
        :type code: str | None
        :type confidence: int | None
        """
        self.path = path
        self.line = line
        self.column = column
        self.level = level
        self.code = code
        self.message = message
        self.confidence = confidence

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

    def format(self, show_confidence=False):
        """
        :type show_confidence: bool
        :rtype: str
        """
        if self.code:
            msg = '%s %s' % (self.code, self.message)
        else:
            msg = self.message

        if show_confidence and self.confidence is not None:
            msg += ' (%d%%)' % self.confidence

        return '%s:%s:%s: %s' % (self.path, self.line, self.column, msg)

    @property
    def sort_key(self):
        """
        :rtype: str
        """
        return '%s:%6d:%6d:%s:%s' % (self.path, self.line, self.column, self.code or '', self.message)
