#  Copyright 2008-2015 Nokia Networks
#  Copyright 2016-     Robot Framework Foundation
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

from contextlib import contextmanager
from os.path import exists, dirname

from robot.output.loggerhelper import LEVELS
from robot.utils import (attribute_escape, get_link_path, html_escape, is_string,
                         safe_str, timestamp_to_secs)

from .expandkeywordmatcher import ExpandKeywordMatcher
from .stringcache import StringCache


class JsBuildingContext:

    def __init__(self, log_path=None, split_log=False, expand_keywords=None,
                 prune_input=False):
        # log_path can be a custom object in unit tests
        self._log_dir = dirname(log_path) if is_string(log_path) else None
        self._split_log = split_log
        self._prune_input = prune_input
        self._strings = self._top_level_strings = StringCache()
        self.basemillis = None
        self.split_results = []
        self.min_level = 'NONE'
        self._msg_links = {}
        self._expand_matcher = ExpandKeywordMatcher(expand_keywords) \
            if expand_keywords else None

    def string(self, string, escape=True, attr=False):
        if escape and string:
            if not is_string(string):
                string = safe_str(string)
            string = (html_escape if not attr else attribute_escape)(string)
        return self._strings.add(string)

    def html(self, string):
        return self._strings.add(string, html=True)

    def relative_source(self, source):
        rel_source = get_link_path(source, self._log_dir) \
            if self._log_dir and source and exists(source) else ''
        return self.string(rel_source)

    def timestamp(self, time):
        if not time:
            return None
        millis = int(timestamp_to_secs(time) * 1000)
        if self.basemillis is None:
            self.basemillis = millis
        return millis - self.basemillis

    def message_level(self, level):
        if LEVELS[level] < LEVELS[self.min_level]:
            self.min_level = level

    def create_link_target(self, msg):
        id = self._top_level_strings.add(msg.parent.id)
        self._msg_links[self._link_key(msg)] = id

    def check_expansion(self, kw):
        if self._expand_matcher is not None:
            self._expand_matcher.match(kw)

    @property
    def expand_keywords(self):
        return self._expand_matcher.matched_ids if self._expand_matcher else None

    def link(self, msg):
        return self._msg_links.get(self._link_key(msg))

    def _link_key(self, msg):
        return (msg.message, msg.level, msg.timestamp)

    @property
    def strings(self):
        return self._strings.dump()

    def start_splitting_if_needed(self, split=False):
        if self._split_log and split:
            self._strings = StringCache()
            return True
        return False

    def end_splitting(self, model):
        self.split_results.append((model, self.strings))
        self._strings = self._top_level_strings
        return len(self.split_results)

    @contextmanager
    def prune_input(self, *items):
        yield
        if self._prune_input:
            for item in items:
                item.clear()
