# preset.py
#
# Change the look of Adwaita, with ease
# Copyright (C) 2022 Gradience Team
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.

import json
import os

from gradience.frontend.settings_schema import settings_schema
from gradience.backend.utils.common import to_slug_case

from gradience.backend.logger import Logger

logging = Logger()


presets_dir = os.path.join(
    os.environ.get("XDG_CONFIG_HOME", os.environ["HOME"] + "/.config"),
    "presets",
)


class Preset:
    variables = {}
    palette = {}
    custom_css = {
        "gtk4": "",
        "gtk3": "",
    }
    plugins = {}
    display_name = "New Preset"
    preset_path = "new_preset"
    badges = {}

    def __init__(self, preset_path=None, text=None, preset=None):
        if preset_path:
            self.load_preset(preset_path=preset_path)
        elif text:  # load from resource
            self.load_preset(text=text)
        elif preset:  # css or dict
            self.load_preset(preset=preset)
        else:
            raise Exception("Failed to create a new Preset object: Preset created without content")

    def load_preset(self, preset_path=None, text=None, preset=None):
        try:
            if not preset:
                if text:
                    preset_text = text
                elif preset_path:
                    self.preset_path = preset_path
                    with open(self.preset_path, "r", encoding="utf-8") as file:
                        preset_text = file.read()
                        file.close()
                else:
                    raise Exception("load_preset must be called with a path, text, or preset")

                preset = json.loads(preset_text)

            self.display_name = preset["name"]
            self.variables = preset["variables"]
            self.palette = preset["palette"]

            if "badges" in preset:
                self.badges = preset["badges"]
            else:
                self.badges = {}

            if "custom_css" in preset:
                self.custom_css = preset["custom_css"]
            else:
                for app_type in settings_schema["custom_css_app_types"]:
                    self.custom_css[app_type] = ""
        except Exception as e:
            if self.preset_path:
                logging.error(f"Failed to load preset {self.preset_path}. Exc: {e}")
            else:
                logging.error(f"Failed to load preset with unknown path. Exc: {e}")

    # Rename an existing preset
    def rename_preset(self, name):
        self.display_name = name
        old_path = self.preset_path
        self.preset_path = os.path.join(
                os.path.dirname(self.preset_path),
                to_slug_case(name) + ".json")

        self.save_preset(to=self.preset_path)
        os.remove(old_path)

    # Save a new user preset (or overwrite one)
    def save_preset(self, name=None, plugins_list=None, to=None):
        self.display_name = name if name else self.display_name

        if to is None:
            filename = to_slug_case(name) if name else "new_preset"
            self.preset_path = os.path.join(
                presets_dir, "user", filename + ".json")
        else:
            self.preset_path = to

        if not os.path.exists(
            os.path.join(
                presets_dir,
                "user",
            )
        ):
            os.makedirs(
                os.path.join(
                    presets_dir,
                    "user",
                )
            )

        if plugins_list is None:
            plugins_list = {}
        else:
            plugins_list = plugins_list.save()

        with open(self.preset_path, "w", encoding="utf-8") as file:
            object_to_write = {
                "name": self.display_name,
                "variables": self.variables,
                "palette": self.palette,
                "custom_css": self.custom_css,
                "plugins": plugins_list,
            }
            file.write(json.dumps(object_to_write, indent=4))
            file.close()

    def validate(self):
        return True