import sys
import os
_klammertext_home = os.environ.get('KLAMMERTEXT_HOME', os.path.expanduser('~/projects/klammertext/K'))
sys.path.append(os.path.join(_klammertext_home, 'sks/kutil'))
sys.path.append(os.path.join(_klammertext_home, 'sks/target'))
import re
import os
import shutil
import kutil
import html_util
import latex_util
import klammer_base
import image_cache
import pprint
from html_util import E
import sys

class Image(klammer_base.Klammer_base):
    id = 0
    def __init__(self, K, as_string=True, width=None):
        super().__init__(K)

        # /dev/shm is a fast RAM-backed tmpfs on Linux; on macOS it does not
        # exist, so fall back to the platform temp directory.
        cache_dir = "/dev/shm"
        if not os.path.isdir(cache_dir):
            import tempfile
            cache_dir = tempfile.gettempdir()
        self.cache = image_cache.Image_cache(cache_dir, self.Image_search_path, verbose=False,
                                             quality=self.Image_quality)
        self.basename = klammer_base.unescape_ktesc(self.basename)
        self.source, self.pwidth, self.pheight = self.cache.get(self.K_target, self.basename)
        self.as_string = as_string
        if width:
            self.width = width
        self.rel_image = None
        self.rel_fraction = 1.0
        if self.rel:
            self.rel_image, self.rel_pwidth, self.rel_pheight = self.cache.get(self.K_target, self.rel)
            self.rel_fraction = self.pwidth / self.rel_pwidth

    def html(self):
        img_dir = f"{self.K_output_dir}/{self.K_output_basename}/{self.Image_output_dir}"

        if not os.path.exists(img_dir):
            os.makedirs(img_dir)
        if not os.path.exists(f"{img_dir}/{os.path.basename(self.source)}"):
            shutil.copy2(self.source, img_dir)

        scale_x, scale_y = 1, 1 # Old

        result = E("img")
        if self.id:
            result.attr("id", self.id)

        filename = f"{self.Image_output_dir}/{os.path.basename(self.source)}"

        result.attr("src", filename).attr("alt", os.path.basename(filename))

        length,  value, ltype = kutil.parse_width("html", self.width, self.rel_fraction)
        if ltype == "w":
            percent = float(value) * 100
            result.sty(f"width: {percent}%")
        elif ltype == "px":
            # The html width ATTRIBUTE takes pixels only; every other unit
            # is a style (an attribute of "2em" was silently ignored).
            result.attr("width", length)
        else:
            result.sty(f"width: {length}")

        if self.border:
            result.cls("image_border")

        result = html_util.add_caption(
            result, "Figure", self.number, self.caption, self.caption_style,
            self.hpos, self.caption_side, False, self.caption_size,
            offset=self.offset)

        result = E("div").body(result).cls("image_margin")

        if self.as_string:
            result = str(result) + "\n"

        return result


    def tex(self):
        # Forward slashes: this path is document text (\includegraphics, an
        # html src), where a Windows backslash is a TeX command or an escape.
        source = os.path.abspath(self.source).replace(os.sep, "/")
        width = kutil.parse_width("tex", self.width, self.rel_fraction)[0]
        width = re.sub("px", "pt", width)
        #result = f'\\includegraphics[width={width}]{{{source}}}'
        if self.number or self.caption:
            result = f'\\includegraphics[width=\\textwidth]{{{source}}}'
            result = latex_util.add_caption(
                result, "Figure", self.number, self.caption, width,
                self.hpos, self.caption_side, offset=self.offset)
        else:
            result = f'\\includegraphics[width={width}]{{{source}}}'
            result = latex_util.caption_wrapper(result, self.hpos, offset=self.offset)
        name = f"Reference-Figure-{Image.id}"
        result = f"\\hypertarget{{{name}}}{{}}\\label{{Label-{name}}}\n{result}"
        Image.id += 1
        # \includegraphics (bare or inside a caption wrapper's minipage) is
        # box material: it must sit in vertical mode or it is typeset beside
        # any text it follows.
        return latex_util.block(result)