# id: org.include-once.inkscape.export-gif
# license: MITL
# version: 1.1
# state: stable
# depends: bin:inkscape (>= 1.1), bin:convert, python (>= 3.6), python:svgelements
# pylint: disable=line-too-long, missing-module-docstring, bad-whitespace
# config:
#    { name: file, type: file, mode: file, value: "~/anim.gif", description: "Target GIF filename", help: "Output filename should end in .gif for actual results. Alternatively can be `APNG:dir/filename.apng` with ImageMagick 7." }
#    { name: mode, type: select, select: "PNG→ImageMagick (better quality)|SVG→ImageMagick (simple drawings)|PNG→Pillow (builtin - a bit faster)|JavaScript→SVG (embed anim code)", value: PNG+ImageMagick, description: Conversion mode, help: "There's different backends to assemble the GIF. Pillow also works on Windows without convert.exe installed. The JavaScript mode embeds some code, does not actually generate a GIF output file." }
#    { name: delay, type: float, value: 0.35, min: 0.01, max: 20, precision: 2, description: "Delay between slides (seconds)", "Can be overriden on a per-slide basis with [--delay=2.5]. Note that convert(1) usually uses »ticks« (*10ms), but this export_gif option is really in seconds." }
#    { name: loop, type: int, value: 0, description: "Loop limit (0 for endless)" }
#    [ hidden: 1, disabled: save_as, type: str, value: "0", description: used in saveas_gif.inx, note: "have to use `str` here, cause .inx `false` is not recognized for hidden attributes" ]
#    { xml: <image width="505" height="50">export_gif.svg</image> }
#    { name: notebook, type: notebook, value: system, description: "Additional flags and help" }
#    { category: ImageMagick, name: fuzz, type: select, select: "0%|5%|10%|20%|30%|50%", value: "10%", description: "Fuzzing/dither", help: "Detect similar colors for optimization" }
#    { category: ImageMagick, name: layers, type: select, select: "optimize|coalesce|compare-any|compare-clear|compare-overlay|composite|dispose|flatten|merge|mosaic|optimize-frame|optimize-plus|optimize-transparency|remove-dups|remove-zero|trim-bounds", value: "optimize", description: "Accumulation/combination of -layers", help: "Can influence optimization or layer combination. Specifically coalesce/merge are pre-interpreted by export_gif to produce accumulating slides." }
#    { category: ImageMagick, name: extra, type: select, select: "-quiet|-optimize|-size 640x360|-alpha background|-auto-gamma|-auto-level|-coalesce|-colors 64|-dither FloydSteinberg|-limit disk 1MB|-reverse|-monochrome|-transparent white", value: "", description: "Extra args", help: "Some default convert -args." }
#    { category: ImageMagick, name: extra2, type: str, value: "", description: "Custom args", help: "Specify additional convert(1) options." }
#    { category: ImageMagick, name: background, type: color, appearance: colorbutton, value: "0", description: "Background color for transparent layers", help: "Only works for SVG→ImageMagick option." }
#    { category: System, name: preview, type: bool, value: 0, description: "Preview result file", help: "Should bring up default image viewer on resulting GIF (via xdg-open, or start… on Windows)" }
#    { category: System, name: keep_tmp, type: bool, value: 0, description: "Keep temporary files", help: "Will retain the frame PNGs in the fixed directory /tmp/inkscape.export_gif/" }
#    { category: System, name: reload_svg, type: bool, value: 0, description: "Reload SVG in Inkscape", help: "Averts the warning popup of lacking result data. But is quite redundant for this tool. And should only be enabled if it's becoming too obnoxious." }
#    { category: System, name: export_background, type: bool, value: 0, description: "Force background application in PNG export", help: "Uses --export-background for generating PNG slides prior assembly. (See ImageMagick for color tab.)" }
#    { category: Animation, name: subframes, type: int, value: 5, description: "Subframes per ❮animation❯ slide", help: "Can be overridden per [animate=25] or [steps=25] in layer label." }

import os
import tempfile
from argparse import Namespace
import re
import functools
import textwrap
import shlex
import shutil
import math
import inkex
from inkex.utils import strargs
from inkex.tween import StyleInterpolator, TransformInterpolator
from inkex.transforms import Transform

        if not self.options.keep_tmp:
            os.unlink(self.options.file)

    def effect(self):
        """ Generate output file when invoked """
        layers = list(self.get_layers())
        fixed_layers = [layer.id for layer in layers if layer.is_fixed]
        temp_files_args = [] # tuples of filename,{-args}

        # more parameter handling
        if re.search("JavaScript", self.options.mode, re.I):
            return self.inject_javascript()
        self.make_temp()
        up_until_mode = re.search("merge|compo|coal|plus", self.options.layers)
        preconvert_png = re.search("PNG", self.options.mode, re.I)

            if layer.animate or self.is_animatable(layer):
                # produces multiple subframes
                anim = AnimationSteps(
                    parent = self, layer = layer,
                    svg = self.export_layers(dest="", show=[layer.id] + fixed_layers + merge_layers)
                )
                temp_files_args.extend(list(anim.export()))
            else:
                # current frame into .svg/.png
                dest = self.export_layers(
                    dest = f"{self.tempdir}/{self.index}.{layer.label}.{img_ext}",
                    show = [layer.id] + fixed_layers + merge_layers
                )
                temp_files_args.append([dest, layer.args])

            os.system(('start %s' if self.win32 else 'xdg-open %r 2>&1 &') % self.options.file)

        if self.options.save_as:
            self.save(self.options.output)
        elif self.options.reload_svg:
            inkex.base.SvgOutputMixin.save(self, self.options.output)

    @staticmethod
    def hex_color(color, with_alpha=True):
        """ convert ints or inkex.Color tuple to #RRGGBBAA string """
        color = inkex.Color(color)
        formatted = "#{:02X}{:02X}{:02X}".format(*color.to_rgb())
        if with_alpha:
            formatted += "{:02X}".format(int(255 * min(1.0, color.alpha)))
        return formatted

    def convert_png(self, svg_path, png_path):
        """ Use the convenience wrapper (more likely referencing the current inkscape binary) """
        extra = {}
        if self.options.background and self.options.export_background:
            color = inkex.Color(self.options.background)
            extra.update({
                "export_background": self.hex_color(color, with_alpha=False),
                "export_background_opacity": "{:.2f}".format(color.alpha),
                # 5%/compareOverlay/-coalesce per channel [--alpha=set] [--channel=A] [--ordered-dither=checks] has some effect
                # compareClear/-coalesce [--channel=A --ordered-dither=4x4 --dispose=-1]
            })
        inkex.command.inkscape(

            svg_path, export_filename=png_path, export_type="png",
            export_area_page=True, export_text_to_path=True, **extra,
            #export_dpi=96, --export-width  --export-height
        )

    def imagick_gif(self, temp_files_args):
        """ Run `convert` using list of exported slides """
        inkex.command.call(*[
            shutil.which("magick") or "convert",
            "-delay", float(self.options.delay) * 100,
            "-loop", self.options.loop,
            "-layers", self.options.layers,
            "-fuzz", self.options.fuzz,   # ToDo: distribute some flags into temp_files_args? (-blur -colors -compose -cycle -fx -gamma -grayscale -ordered-dither -resample -resize -transparent )
            "-background", self.hex_color(self.options.background) if self.options.background else "None",
            *shlex.split(self.options.extra),
            *shlex.split(self.options.extra2),
            *self.zip_args(temp_files_args),
            *[os.path.expanduser(self.options.file)]
        ])










    @staticmethod
    def zip_args(temp_files_args):
        """ unzip files and possible -args (fitted list of dicts) """
        for filename, arg_list in temp_files_args:
            for key, val in arg_list.items():
                if key == "write":
                    continue

        frames[0].save(
            os.path.expanduser(self.options.file),
            save_all = True,
            append_images = frames[1:],
            version = "GIF89a",
            optimize = True,
            disposal = 1, # no disposal
            duration = [float(args[1].get("delay", self.options.delay)) * 1000 for args in temp_files_args],
            loop = self.options.loop,
        )







    def clean_up(self):
        """ remove tmp files + dir, automatically invoked by base.run() """
        super().clean_up()
        if self.options.keep_tmp or not self.tempdir or not os.path.exists(self.tempdir):
            return
        for file_name in os.listdir(self.tempdir):
            os.unlink(self.tempdir + "/" + file_name)

        with open(dest, "wb") as svg_fp:
            svg_fp.write(svg.tostring())
        if dest_png:
            self.convert_png(dest, dest_png)
        return dest_png or dest

    def get_layers(self):
        """ Per default all layers are exported, label tags [bg], [exclude], [merge] yield special treatment """
        for layer in self.svg.xpath('./svg:g[@inkscape:groupmode="layer"][@inkscape:label]'):

            label = layer.attrib["{http://www.inkscape.org/namespaces/inkscape}label"]
            animate = re.findall(r"\[(?:steps|animate)(?:=(\d+))?\]", label)

            yield Namespace(
                id = layer.attrib["id"],
                label = re.sub(r"\W+", "_", label),
                is_fixed = bool(re.search(r"fixed|\[(is_?fixe?d?|foreground)\]", label)),
                is_sticky = bool(re.search(r"background|\[(bg)\]", label)),
                no_frame = bool(re.search(r"fixed|\[(merge|no_frame|exclude)\]", label)),
                do_merge = bool(re.search(r"\[(merge|join|group)\]", label)),
                animate = int(([i for i in animate if i] or [self.options.subframes])[0]) if animate else 0,
                tags = re.findall(r"\[(\w+)\]", label),
                args = dict(re.findall(r"--(\w[\w\-]+)=(\w[^\s,;\]\)]*)", label))
            )

    def inject_javascript(self):
        """ insert JavaScript version into SVG document """
        script = inkex.Script()

        self.layer = layer
        self.frames = layer.animate
        self.delay = float(layer.args.get("delay", self.gif.options.delay))
        self.layer.args.update({
            "delay": self.delay / self.frames   # frame time split between animation steps
        })

    def export(self):
        """ applies transforms in each subframe, yields filename+args list """
        transforms = []
        for anim in self.svg.xpath("//svg:animate"):
            transforms.append([self.animate_style(anim, **anim.attrib), self.pace(anim)])
        for anim in self.svg.xpath("//svg:animateTransform"):
            transforms.append([self.animate_transform(anim, **anim.attrib), self.pace(anim)])
        for anim in self.svg.xpath("//svg:animateMotion"):