# Copyright 2004-2018 Tom Rothamel <pytom@bishoujo.us>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

# This file contains some miscellaneous displayables that involve images.
# Most of the guts of this file have been moved into im.py, with only some
# of the stuff thar uses images remaining.

import renpy.display
import renpy.text
from renpy.display.render import render, Render

import collections

# A map from image name to the displayable object corresponding to that
# image.
images = { }

# A map from image tag to lists of possible attributes for images with that
# tag.
image_attributes = collections.defaultdict(list)

# The set of image names Ren'Py knows about, as strings with spaces.
image_names = [ ]


def list_images():
    """
    :doc: image_func

    Returns a list of images that have been added to Ren'Py, as a list of
    strings with spaces between the name components.
    """

    return image_names


def get_available_image_tags():
    """
    :doc: image_func

    Returns a list of image tags that have been defined.
    """

    return [ k for k, v in image_attributes.items() if v ]


def get_available_image_attributes(tag, attributes=()):
    """
    :undocumented:

    Returns a list of tuples, with each tuple representing a possible
    combination of image attributes that can be associated with `tag`.
    If `attributes` is given, only images that contain all the attributes
    in that iterable are returned.
    """

    rv = [ ]

    if tag not in image_attributes:
        return rv

    for at in image_attributes[tag]:
        for a in attributes:
            if a not in at:
                break
        else:
            rv.append(at)

    return rv


def get_tag_method(tag, method):
    """
    This looks for an image named `tag`, then tries to grab the given method
    from it. If it can do that, returns a reference to the method. Otherwise,
    it returns None.
    """

    ti =  images.get((tag,), None)

    if ti is None:
        return None

    return getattr(ti, method, None)


def check_image_attributes(tag, attributes):
    """
    :doc: image_func

    Checks to see if there is a unique image with the given tag and
    attributes. If there is, returns the attributes in order.
    Otherwise, returns None.
    """

    ca = get_tag_method(tag, "_choose_attributes")

    if ca is not None:
        return ca(tag, attributes, None)

    l = get_available_image_attributes(tag, attributes)

    # Check to see if there's an image that is exactly the one we want.
    for i in l:
        if len(i) == len(attributes):
            return tuple(i)

    if len(l) != 1:
        return None

    return tuple(l[0])


def get_ordered_image_attributes(tag, attributes=(), sort=None):
    """
    :doc: image_func

    Returns a list of image tags, ordered in a way that makes sense to
    present to the user.

    `attributes`
        If present, only attributes that are compatible with the given
        attributes are considered. (Compatible means that the attributes
        can be in a single image at the same time.)

    `sort`
        If not None, the returned list of attributes is sorted. This is a function
        that should be used as a tiebreaker.

    """

    la = get_tag_method(tag, "_list_attributes")

    if la is not None:
        return la(tag, attributes)

    attrcount = collections.defaultdict(int)
    attrtotalpos = collections.defaultdict(float)

    for attrlist in get_available_image_attributes(tag, attributes):
        for i, attr in enumerate(attrlist):
            attrcount[attr] += 1
            attrtotalpos[attr] += i

    if sort is None:

        return list(attrcount.keys())

    else:

        l = [ ]

        for attr in attrcount:
            l.append((attrtotalpos[attr] / attrcount[attr], sort(attr), attr))

        l.sort()
        return [ i[2] for i in l ]


def register_image(name, d):
    """
    Registers the existence of an image with `name`, and that the image
    used displayable d.

    `name`
        A tuple of strings.
    """

    tag = name[0]
    rest = name[1:]

    images[name] = d
    image_attributes[tag].append(rest)

    image_names.append(" ".join(name))


def image_exists(name, exact=False):
    """
    :doc: image_func
    :name: renpy.has_image

    Return true if an image with `name` exists, and false if no such image
    exists.

    `name`
        Either a string giving an image name, or a tuple of strings giving
        the name components.

    `exact`
        Returns true if and only if an image with the exact name exists -
        parameterized matches are not included.
    """

    if not isinstance(name, tuple):
        name = tuple(name.split())

    while name:
        if name in images:
            return True

        if exact:
            return False

        name = name[:-1]

    return False


def wrap_render(child, w, h, st, at):
    rend = render(child, w, h, st, at)
    rv = Render(rend.width, rend.height)
    rv.blit(rend, (0, 0))
    return rv


class ImageReference(renpy.display.core.Displayable):
    """
    ImageReference objects are used to reference images by their name,
    which is a tuple of strings corresponding to the name used to define
    the image in an image statment.
    """

    nosave = [ 'target' ]

    target = None
    old_transform = None
    param_target = None

    __version__ = 1

    def after_upgrade(self, version):
        if version < 1:
            if isinstance(self.param_target, renpy.display.transform.Transform):
                self.old_transform = self.param_target

    def __init__(self, name, **properties):
        """
        @param name: A tuple of strings, the name of the image. Or else
        a displayable, containing the image directly.
        """

        super(ImageReference, self).__init__(**properties)

        self.name = name

    def __unicode__(self):
        return u"<ImageReference {!r}>".format(self.name)

    def __hash__(self):
        return hash(self.name)

    def __eq__(self, o):
        if self is o:
            return True

        if not self._equals(o):
            return False

        if self.name != o.name:
            return False

        return True

    def _target(self):

        if self.target is None:
            self.find_target()

        return self.target._target()

    def find_target(self):

        name = self.name

        if isinstance(name, renpy.display.core.Displayable):
            self.target = name
            return True

        if not isinstance(name, tuple):
            name = tuple(name.split())

        def error(msg):
            self.target = renpy.text.text.Text(msg, color=(255, 0, 0, 255), xanchor=0, xpos=0, yanchor=0, ypos=0)

            if renpy.config.debug:
                raise Exception(msg)

        args = [ ]

        while name:
            target = images.get(name, None)

            if target is not None:
                break

            args.insert(0, name[-1])
            name = name[:-1]

        if not name:
            error("Image '%s' not found." % ' '.join(self.name))
            return False

        try:

            a = self._args.copy(name=name, args=args)

            self.target = target._duplicate(a)

        except Exception as e:

            if renpy.config.debug:
                raise

            error(str(e))

        # Copy the old transform over.
        new_transform = self.target._target()

        if isinstance(new_transform, renpy.display.transform.Transform):
            if self.old_transform is not None:
                new_transform.take_state(self.old_transform)

            self.old_transform = new_transform

        else:
            self.old_transform = None

        return True

    _duplicatable = True

    def _duplicate(self, args):

        rv = self._copy(args)
        rv.target = None

        if isinstance(rv.name, renpy.display.core.Displayable):
            if rv.name._duplicatable:
                rv.name = rv.name._duplicate(args)

        rv.find_target()
        rv._duplicatable = rv.target._duplicatable

        return rv

    def _unique(self):

        if self.target is None:
            self.find_target()

        self._duplicatable = self.target._duplicatable

    def _in_current_store(self):

        if self.target is None:
            self.find_target()

        target = self.target._in_current_store()

        if target is self.target:
            return self

        rv = self._copy()
        rv.target = target
        return rv

    def _handles_event(self, event):
        if self.target is None:
            return False

        return self.target._handles_event(event)

    def _hide(self, st, at, kind):
        if self.target is None:
            self.find_target()

        return self.target._hide(st, at, kind)

    def set_transform_event(self, event):
        if self.target is None:
            self.find_target()

        return self.target.set_transform_event(event)

    def event(self, ev, x, y, st):
        if self.target is None:
            self.find_target()

        return self.target.event(ev, x, y, st)

    def render(self, width, height, st, at):
        if self.target is None:
            self.find_target()

        return wrap_render(self.target, width, height, st, at)

    def get_placement(self):
        if self.target is None:
            self.find_target()

        if not renpy.config.imagereference_respects_position:
            return self.target.get_placement()

        xpos, ypos, xanchor, yanchor, xoffset, yoffset, subpixel = self.target.get_placement()

        if xpos is None:
            xpos = self.style.xpos

        if ypos is None:
            ypos = self.style.ypos

        if xanchor is None:
            xanchor = self.style.xanchor

        if yanchor is None:
            yanchor = self.style.yanchor

        return xpos, ypos, xanchor, yanchor, xoffset, yoffset, subpixel

    def visit(self):
        if self.target is None:
            self.find_target()

        return [ self.target ]


class DynamicImage(renpy.display.core.Displayable):
    """
    :doc: disp_imagelike
    :args: (name)

    A DynamicImage is a displayable that has text interpolation performed
    on it to yield a string giving a new displayable. Such interpolation is
    performed at the start of each interaction.
    """

    nosave = [ 'raw_target' ]

    # The target that this image currently resolves to.
    target = None

    # The raw target that the image resolves to, before it has been parameterized.
    raw_target = None

    # Have we been locked, so we never change?
    locked = False

    # The name used for hashing.
    hash_name = None

    def __init__(self, name, scope=None, **properties):
        super(DynamicImage, self).__init__(**properties)

        self.name = name

        if scope is not None:
            self.find_target(scope)
            self._uses_scope = True
        else:
            self._uses_scope = False

        if isinstance(name, basestring) and ("[prefix_" in name):
            self._duplicatable = True

        if isinstance(name, list):
            for i in name:
                if ("[prefix_" in i):
                    self._duplicatable = True

    def _scope(self, scope, update):
        return self.find_target(scope, update)

    def __unicode__(self):
        return u"DynamicImage {!r}".format(self.name)

    def __hash__(self):

        if self.hash_name is None:
            if isinstance(self.name, list):
                self.hash_name = tuple(self.name)
            else:
                self.hash_name = self.name

        return hash(self.hash_name)

    def __eq__(self, o):
        if self is o:
            return True

        if not self._equals(o):
            return False

        if self.name != o.name:
            return False

        return True

    def _target(self):
        if self.target:
            return self.target._target()
        else:
            return self

    def find_target(self, scope=None, update=True):

        if self.locked and (self.target is not None):
            return

        if self._args.prefix is None:
            prefix = ""
        else:
            prefix = self._args.prefix

        try:
            search = [ ]
            target = renpy.easy.dynamic_image(self.name, scope, prefix=prefix, search=search)
        except KeyError as ke:
            raise Exception("In DynamicImage %r: Could not find substitution '%s'." % (self.name, unicode(ke.args[0])))
        except Exception as e:
            raise Exception("In DynamicImage %r: %r" % (self.name, e))

        if target is None:
            error = "DynamicImage %r: could not find image." % (self.name,)

            if len(search) == 1:
                error += " (%r)" % (search[0],)
            elif len(search) == 2:
                error += " (%r, %r)" % (search[0], search[1])
            elif len(search) > 2:
                error += " (%r, %r, and %d more.)" % (search[0], search[1], len(search) - 2)

            raise Exception(error)

        if self.raw_target == target:
            return False

        if not update:
            return True

        self.raw_target = target
        old_target = self.target

        if target._duplicatable:
            target = target._duplicate(self._args)

        self.target = target

        renpy.display.render.redraw(self, 0)

        if not old_target:
            return True

        if not isinstance(old_target, renpy.display.motion.Transform):
            return True

        if not isinstance(target, renpy.display.motion.Transform):
            self.target = target = renpy.display.motion.Transform(child=target)

        target.take_state(old_target)

        return True

    def _duplicate(self, args):
        rv = self._copy(args)
        rv.target = None
        # This does not set _duplicatable, since it should always remain the
        # same.
        return rv

    def _in_current_store(self):
        rv = self._copy()

        if rv.target:
            rv.target = rv.target._in_current_store()

        rv.locked = True
        return rv

    def _handles_event(self, event):
        if self.target is None:
            return False

        return self.target._handles_event(event)

    def _hide(self, st, at, kind):
        if self.target is None:
            self.find_target()

        return self.target._hide(st, at, kind)

    def set_transform_event(self, event):
        if self.target is None:
            self.find_target()

        return self.target.set_transform_event(event)

    def event(self, ev, x, y, st):
        if self.target is None:
            self.find_target()

        return self.target.event(ev, x, y, st)

    def render(self, width, height, st, at):
        if self.target is None:
            self.find_target()

        return wrap_render(self.target, width, height, st, at)

    def get_placement(self):
        if self.target is None:
            self.find_target()

        return self.target.get_placement()

    def visit(self):

        if self.target is None:
            self.find_target()

        return [ self.target ]

    def per_interact(self):
        old_target = self.target

        if not self._uses_scope:
            self.find_target()

        if old_target is not self.target:
            self.target.visit_all(lambda i : i.per_interact())


class ShownImageInfo(renpy.object.Object):
    """
    This class keeps track of which images are being shown right now,
    and what the attributes of those images are. (It's used for a similar
    purpose during prediction, regarding the state in the future.)
    """

    __version__ = 2

    def __init__(self, old=None):
        """
        Creates a new object. If `old` is given, copies the default state
        from old, otherwise initializes the object to a default state.
        """

        if old is None:

            # A map from (layer, tag) -> tuple of attributes
            # This doesn't necessarily correspond to something that is
            # currently showing, as we can remember the state of a tag
            # for use in SideImage.
            self.attributes = { }

            # A set of (layer, tag) pairs that are being shown on the
            # screen right now.
            self.shown = set()

        else:
            self.attributes = old.attributes.copy()
            self.shown = old.shown.copy()

    def after_upgrade(self, version):
        if version < 2:

            self.attributes = { }
            self.shown = set()

            for layer in self.images:
                for tag in self.images[layer]:
                    self.attributes[layer, tag] = self.images[layer][tag][1:]
                    self.shown.add((layer, tag))

    def get_attributes(self, layer, tag, default=()):
        """
        Get the attributes associated the image with tag on the given
        layer.
        """

        return self.attributes.get((layer, tag), default)

    def showing(self, layer, name, exact=False):
        """
        Returns true if name is the prefix of an image that is showing
        on layer, or false otherwise.
        """

        tag = name[0]
        rest = name[1:]

        if (layer, tag) not in self.shown:
            return None

        shown = self.attributes[layer, tag]

        if len(shown) < len(rest):
            return False

        if exact and (len(shown) != len(rest)):
            return False

        for a, b in zip(shown, rest):
            if a != b:
                return False

        return True

    def get_showing_tags(self, layer):
        """
        Returns the set of tags being shown on `layer`.
        """

        return { t for l, t in self.shown if l == layer }

    def predict_scene(self, layer):
        """
        Predicts the scene statement being called on layer.
        """

        if layer is None:
            layer = 'master'

        for l, t in self.attributes.keys():
            if l == layer:
                del self.attributes[l, t]

        self.shown = set((l, t) for l, t in self.shown if l != layer)

    def predict_show(self, layer, name, show=True):
        """
        Predicts name being shown on layer.

        `show`
            If True, the image will be flagged as being shown to the user. If
            False, only the attributes will be updated.
        """

        tag = name[0]
        rest = name[1:]

        self.attributes[layer, tag] = rest

        if show:
            self.shown.add((layer, tag))

    def predict_hide(self, layer, name):
        tag = name[0]

        if (layer, tag) in self.attributes:
            del self.attributes[layer, tag]

        self.shown.discard((layer, tag))

    def apply_attributes(self, layer, tag, name, wanted=[], remove=[]):
        """
        Given a layer, tag, and an image name (with attributes),
        returns the canonical name of an image, if one exists. Raises
        an exception if it's ambiguious, and returns None if an image
        with that name couldn't be found.
        """

        # If the name matches one that exactly exists, return it.
        if (name in images) and not (wanted or remove):
            ca = get_tag_method(tag, "_choose_attributes")
            if ca is None:
                return name

        nametag = name[0]

        # The set of attributes a matching image must have.
        required = set(name[1:])

        # The set of attributes a matching image may have.
        optional = set(wanted) | set(self.attributes.get((layer, tag), [ ]))

        # Deal with banned attributes..
        for i in name[1:]:
            if i[0] == "-":
                optional.discard(i[1:])
                required.discard(i)

        for i in remove:
            optional.discard(i)

        return self.choose_image(nametag, required, optional, name)

    def choose_image(self, tag, required, optional, exception_name):

        ca = get_tag_method(tag, "_choose_attributes")
        if ca is not None:
            attrs = ca(tag, required, optional)

            if attrs is not None:
                return (tag,) + attrs

        # The longest length of an image that matches.
        max_len = -1

        # The list of matching images.
        matches = None

        for attrs in image_attributes[tag]:

            num_required = 0

            for i in attrs:
                if i in required:
                    num_required += 1
                    continue

                elif i not in optional:
                    break

            else:

                # We don't have any not-found attributes. But we might not
                # have all of the attributes.

                if num_required != len(required):
                    continue

                len_attrs = len(set(attrs))

                if len_attrs < max_len:
                    continue

                if len_attrs > max_len:
                    max_len = len_attrs
                    matches = [ ]

                matches.append((tag, ) + attrs)

        if matches is None:
            return None

        if len(matches) == 1:
            return matches[0]

        if exception_name:
            raise Exception("Showing '" + " ".join(exception_name) + "' is ambiguous, possible images include: " + ", ".join(" ".join(i) for i in matches))
        else:
            return None


renpy.display.core.ImagePredictInfo = ShownImageInfo


# Functions that have moved from this module to other modules,
# that live here for the purpose of backward-compatibility.
Image = renpy.display.im.image
Solid = renpy.display.imagelike.Solid
Frame = renpy.display.imagelike.Frame
ImageButton = renpy.display.behavior.ImageButton
