#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
screen_size property
"""
from rebulk.match import Match
from rebulk.remodule import re

from rebulk import Rebulk, Rule, RemoveMatch, AppendMatch

from ..common.pattern import is_disabled
from ..common.quantity import FrameRate
from ..common.validators import seps_surround
from ..common import dash, seps
from ...reutils import build_or_pattern


def screen_size(config):
    """
    Builder for rebulk object.

    :param config: rule configuration
    :type config: dict
    :return: Created Rebulk object
    :rtype: Rebulk
    """
    interlaced = frozenset({res for res in config['interlaced']})
    progressive = frozenset({res for res in config['progressive']})
    frame_rates = [re.escape(rate) for rate in config['frame_rates']]
    min_ar = config['min_ar']
    max_ar = config['max_ar']

    rebulk = Rebulk()
    rebulk = rebulk.string_defaults(ignore_case=True).regex_defaults(flags=re.IGNORECASE)

    rebulk.defaults(name='screen_size', validator=seps_surround, abbreviations=[dash],
                    disabled=lambda context: is_disabled(context, 'screen_size'))

    frame_rate_pattern = build_or_pattern(frame_rates, name='frame_rate')
    interlaced_pattern = build_or_pattern(interlaced, name='height')
    progressive_pattern = build_or_pattern(progressive, name='height')

    res_pattern = r'(?:(?P<width>\d{3,4})(?:x|\*))?'
    rebulk.regex(res_pattern + interlaced_pattern + r'(?P<scan_type>i)' + frame_rate_pattern + '?')
    rebulk.regex(res_pattern + progressive_pattern + r'(?P<scan_type>p)' + frame_rate_pattern + '?')
    rebulk.regex(res_pattern + progressive_pattern + r'(?P<scan_type>p)?(?:hd)')
    rebulk.regex(res_pattern + progressive_pattern + r'(?P<scan_type>p)?x?')
    rebulk.string('4k', value='2160p')
    rebulk.regex(r'(?P<width>\d{3,4})-?(?:x|\*)-?(?P<height>\d{3,4})',
                 conflict_solver=lambda match, other: '__default__' if other.name == 'screen_size' else other)

    rebulk.regex(frame_rate_pattern + '(p|fps)', name='frame_rate',
                 formatter=FrameRate.fromstring, disabled=lambda context: is_disabled(context, 'frame_rate'))

    rebulk.rules(PostProcessScreenSize(progressive, min_ar, max_ar), ScreenSizeOnlyOne, ResolveScreenSizeConflicts)

    return rebulk


class PostProcessScreenSize(Rule):
    """
    Process the screen size calculating the aspect ratio if available.

    Convert to a standard notation (720p, 1080p, etc) when it's a standard resolution and
    aspect ratio is valid or not available.

    It also creates an aspect_ratio match when available.
    """
    consequence = AppendMatch

    def __init__(self, standard_heights, min_ar, max_ar):
        super(PostProcessScreenSize, self).__init__()
        self.standard_heights = standard_heights
        self.min_ar = min_ar
        self.max_ar = max_ar

    def when(self, matches, context):
        to_append = []
        for match in matches.named('screen_size'):
            if not is_disabled(context, 'frame_rate'):
                for frame_rate in match.children.named('frame_rate'):
                    frame_rate.formatter = FrameRate.fromstring
                    to_append.append(frame_rate)

            values = match.children.to_dict()
            if 'height' not in values:
                continue

            scan_type = (values.get('scan_type') or 'p').lower()
            height = values['height']
            if 'width' not in values:
                match.value = '{0}{1}'.format(height, scan_type)
                continue

            width = values['width']
            calculated_ar = float(width) / float(height)

            aspect_ratio = Match(match.start, match.end, input_string=match.input_string,
                                 name='aspect_ratio', value=round(calculated_ar, 3))

            if not is_disabled(context, 'aspect_ratio'):
                to_append.append(aspect_ratio)

            if height in self.standard_heights and self.min_ar < calculated_ar < self.max_ar:
                match.value = '{0}{1}'.format(height, scan_type)
            else:
                match.value = '{0}x{1}'.format(width, height)

        return to_append


class ScreenSizeOnlyOne(Rule):
    """
    Keep a single screen_size per filepath part.
    """
    consequence = RemoveMatch

    def when(self, matches, context):
        to_remove = []
        for filepart in matches.markers.named('path'):
            screensize = list(reversed(matches.range(filepart.start, filepart.end,
                                                     lambda match: match.name == 'screen_size')))
            if len(screensize) > 1 and len(set((match.value for match in screensize))) > 1:
                to_remove.extend(screensize[1:])

        return to_remove


class ResolveScreenSizeConflicts(Rule):
    """
    Resolve screen_size conflicts with season and episode matches.
    """
    consequence = RemoveMatch

    def when(self, matches, context):
        to_remove = []
        for filepart in matches.markers.named('path'):
            screensize = matches.range(filepart.start, filepart.end, lambda match: match.name == 'screen_size', 0)
            if not screensize:
                continue

            conflicts = matches.conflicting(screensize, lambda match: match.name in ('season', 'episode'))
            if not conflicts:
                continue

            has_neighbor = False
            video_profile = matches.range(screensize.end, filepart.end, lambda match: match.name == 'video_profile', 0)
            if video_profile and not matches.holes(screensize.end, video_profile.start,
                                                   predicate=lambda h: h.value and h.value.strip(seps)):
                to_remove.extend(conflicts)
                has_neighbor = True

            previous = matches.previous(screensize, index=0, predicate=(
                lambda m: m.name in ('date', 'source', 'other', 'streaming_service')))
            if previous and not matches.holes(previous.end, screensize.start,
                                              predicate=lambda h: h.value and h.value.strip(seps)):
                to_remove.extend(conflicts)
                has_neighbor = True

            if not has_neighbor:
                to_remove.append(screensize)

        return to_remove