# -*- coding: utf-8 -*-

# Copyright © 2012-2025 Roberto Alsina and others.

# 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
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# 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.
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# 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
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"""Process images."""

import datetime
import gzip
import logging
import os
import re
import typing

import lxml.etree
import piexif
from PIL import ExifTags, Image

from nikola import utils

EXIF_TAG_NAMES = {}


class ImageProcessor(object):
    """Apply image operations."""

    logger: logging.Logger
    dates: typing.Dict[str, datetime.datetime]

    image_ext_list_builtin = ['.jpg', '.png', '.jpeg', '.gif', '.svg', '.svgz', '.bmp', '.tiff', '.webp']

    def _fill_exif_tag_names(self):
        """Connect EXIF tag names to numeric values."""
        if not EXIF_TAG_NAMES:
            for ifd in piexif.TAGS:
                for tag, data in piexif.TAGS[ifd].items():
                    EXIF_TAG_NAMES[tag] = data['name']

    def filter_exif(self, exif, whitelist):
        """Filter EXIF data as described in the documentation."""
        # Scenario 1: keep everything
        if whitelist == {'*': '*'}:
            return exif

        # Scenario 2: keep nothing
        if whitelist == {}:
            return None

        # Scenario 3: keep some
        self._fill_exif_tag_names()
        exif = exif.copy()  # Don't modify in-place, it's rude
        for k in list(exif.keys()):
            if not isinstance(exif[k], dict):
                pass  # At least thumbnails have no fields
            elif k not in whitelist:
                exif.pop(k)  # Not whitelisted, remove
            elif k in whitelist and whitelist[k] == '*':
                # Fully whitelisted, keep all
                pass
            else:
                # Partially whitelisted
                for tag in list(exif[k].keys()):
                    if EXIF_TAG_NAMES[tag] not in whitelist[k]:
                        exif[k].pop(tag)

        return exif or None

    def resize_image(self, src, dst=None, max_size=None, bigger_panoramas=True, preserve_exif_data=False, exif_whitelist={}, preserve_icc_profiles=False, dst_paths=None, max_sizes=None):
        """Make a copy of the image in the requested size(s).

        max_sizes should be a list of sizes, and the image would be resized to fit in a
        square of each size (preserving aspect ratio).

        dst_paths is a list of the destination paths, and should be the same length as max_sizes.

        Backwards compatibility:

        * If max_sizes is None, it's set to [max_size]
        * If dst_paths is None, it's set to [dst]
        * Either max_size or max_sizes should be set
        * Either dst or dst_paths should be set
        """
        if dst_paths is None:
            dst_paths = [dst]
        if max_sizes is None:
            max_sizes = [max_size]
        if len(max_sizes) != len(dst_paths):
            raise ValueError('resize_image called with incompatible arguments: {} / {}'.format(dst_paths, max_sizes))
        extension = os.path.splitext(src)[1].lower()
        if extension in {'.svg', '.svgz'}:
            self.resize_svg(src, dst_paths, max_sizes, bigger_panoramas)
            return

        _im = Image.open(src)

        # The jpg exclusion is Issue #3332
        is_animated = hasattr(_im, 'n_frames') and _im.n_frames > 1 and extension not in {'.jpg', '.jpeg'}

        exif = None
        if "exif" in _im.info:
            exif = piexif.load(_im.info["exif"])
            # Rotate according to EXIF
            if "0th" in exif:
                value = exif['0th'].get(piexif.ImageIFD.Orientation, 1)
                if value in (3, 4):
                    _im = _im.transpose(Image.ROTATE_180)
                elif value in (5, 6):
                    _im = _im.transpose(Image.ROTATE_270)
                elif value in (7, 8):
                    _im = _im.transpose(Image.ROTATE_90)
                if value in (2, 4, 5, 7):
                    _im = _im.transpose(Image.FLIP_LEFT_RIGHT)
                exif['0th'][piexif.ImageIFD.Orientation] = 1
            exif = self.filter_exif(exif, exif_whitelist)

        icc_profile = _im.info.get('icc_profile') if preserve_icc_profiles else None

        for dst, max_size in zip(dst_paths, max_sizes):
            if is_animated:  # Animated gif, leave as-is
                utils.copy_file(src, dst)
                continue

            im = _im.copy()

            size = w, h = im.size
            if w > max_size or h > max_size:
                size = max_size, max_size
                # Panoramas get larger thumbnails because they look *awful*
                if bigger_panoramas and w > 3 * h:
                    size = min(w, max_size * 4), min(w, max_size * 4)
            try:
                im.thumbnail(size, Image.Resampling.LANCZOS)
                save_args = {}
                if icc_profile:
                    save_args['icc_profile'] = icc_profile

                if exif is not None and preserve_exif_data:
                    # Put right size in EXIF data
                    w, h = im.size
                    if '0th' in exif:
                        exif["0th"][piexif.ImageIFD.ImageWidth] = w
                        exif["0th"][piexif.ImageIFD.ImageLength] = h
                    if 'Exif' in exif:
                        exif["Exif"][piexif.ExifIFD.PixelXDimension] = w
                        exif["Exif"][piexif.ExifIFD.PixelYDimension] = h
                    # Filter EXIF data as required
                    save_args['exif'] = piexif.dump(exif)

                im.save(dst, **save_args)
            except Exception as e:
                self.logger.warning("Can't process {0}, using original "
                                    "image! ({1})".format(src, e))
                utils.copy_file(src, dst)

    def resize_svg(self, src, dst_paths, max_sizes, bigger_panoramas):
        """Make a copy of an svg at the requested sizes."""
        # Resize svg based on viewport hacking.
        # note that this can also lead to enlarged svgs
        if src.endswith('.svgz'):
            with gzip.GzipFile(src, 'rb') as op:
                xml = op.read()
        else:
            with open(src, 'rb') as op:
                xml = op.read()

        for dst, max_size in zip(dst_paths, max_sizes):
            try:
                tree = lxml.etree.XML(xml)
                width = tree.attrib['width']
                height = tree.attrib['height']
                w = int(re.search("[0-9]+", width).group(0))
                h = int(re.search("[0-9]+", height).group(0))
                # calculate new size preserving aspect ratio.
                ratio = float(w) / h
                # Panoramas get larger thumbnails because they look *awful*
                if bigger_panoramas and w > 3 * h:
                    max_size = max_size * 4
                if w > h:
                    w = max_size
                    h = max_size / ratio
                else:
                    w = max_size * ratio
                    h = max_size
                w = int(w)
                h = int(h)
                tree.attrib.pop("width")
                tree.attrib.pop("height")
                tree.attrib['viewport'] = "0 0 %ipx %ipx" % (w, h)
                if dst.endswith('.svgz'):
                    op = gzip.GzipFile(dst, 'wb')
                else:
                    op = open(dst, 'wb')
                op.write(lxml.etree.tostring(tree))
                op.close()
            except (KeyError, AttributeError) as e:
                self.logger.warning("No width/height in %s. Original exception: %s" % (src, e))
                utils.copy_file(src, dst)
            except Exception as e:
                self.logger.warning("Can't process {0}, using original "
                                    "image! ({1})".format(src, e))
                utils.copy_file(src, dst)

    def image_date(self, src):
        """Try to figure out the date of the image."""
        if src not in self.dates:
            try:
                im = Image.open(src)
                exif = im._getexif()
                im.close()
            except Exception:
                exif = None
            if exif is not None:
                for tag, value in list(exif.items()):
                    decoded = ExifTags.TAGS.get(tag, tag)
                    if decoded in ('DateTimeOriginal', 'DateTimeDigitized'):
                        try:
                            if isinstance(value, tuple):
                                value = value[0]
                            self.dates[src] = datetime.datetime.strptime(
                                value, '%Y:%m:%d %H:%M:%S')
                            break
                        except ValueError:  # Invalid EXIF date.
                            pass
        if src not in self.dates:
            self.dates[src] = datetime.datetime.fromtimestamp(
                os.stat(src).st_mtime)
        return self.dates[src]
